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Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/rzhang/linux
[deliverable/linux.git] / drivers / acpi / nfit.c
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>
16 #include <linux/mutex.h>
17 #include <linux/ndctl.h>
18 #include <linux/list.h>
19 #include <linux/acpi.h>
20 #include <linux/sort.h>
21 #include <linux/pmem.h>
22 #include <linux/io.h>
23 #include <asm/cacheflush.h>
24 #include "nfit.h"
25
26 /*
27 * For readq() and writeq() on 32-bit builds, the hi-lo, lo-hi order is
28 * irrelevant.
29 */
30 #include <linux/io-64-nonatomic-hi-lo.h>
31
32 static bool force_enable_dimms;
33 module_param(force_enable_dimms, bool, S_IRUGO|S_IWUSR);
34 MODULE_PARM_DESC(force_enable_dimms, "Ignore _STA (ACPI DIMM device) status");
35
36 struct nfit_table_prev {
37 struct list_head spas;
38 struct list_head memdevs;
39 struct list_head dcrs;
40 struct list_head bdws;
41 struct list_head idts;
42 struct list_head flushes;
43 };
44
45 static u8 nfit_uuid[NFIT_UUID_MAX][16];
46
47 const u8 *to_nfit_uuid(enum nfit_uuids id)
48 {
49 return nfit_uuid[id];
50 }
51 EXPORT_SYMBOL(to_nfit_uuid);
52
53 static struct acpi_nfit_desc *to_acpi_nfit_desc(
54 struct nvdimm_bus_descriptor *nd_desc)
55 {
56 return container_of(nd_desc, struct acpi_nfit_desc, nd_desc);
57 }
58
59 static struct acpi_device *to_acpi_dev(struct acpi_nfit_desc *acpi_desc)
60 {
61 struct nvdimm_bus_descriptor *nd_desc = &acpi_desc->nd_desc;
62
63 /*
64 * If provider == 'ACPI.NFIT' we can assume 'dev' is a struct
65 * acpi_device.
66 */
67 if (!nd_desc->provider_name
68 || strcmp(nd_desc->provider_name, "ACPI.NFIT") != 0)
69 return NULL;
70
71 return to_acpi_device(acpi_desc->dev);
72 }
73
74 static int acpi_nfit_ctl(struct nvdimm_bus_descriptor *nd_desc,
75 struct nvdimm *nvdimm, unsigned int cmd, void *buf,
76 unsigned int buf_len)
77 {
78 struct acpi_nfit_desc *acpi_desc = to_acpi_nfit_desc(nd_desc);
79 const struct nd_cmd_desc *desc = NULL;
80 union acpi_object in_obj, in_buf, *out_obj;
81 struct device *dev = acpi_desc->dev;
82 const char *cmd_name, *dimm_name;
83 unsigned long dsm_mask;
84 acpi_handle handle;
85 const u8 *uuid;
86 u32 offset;
87 int rc, i;
88
89 if (nvdimm) {
90 struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
91 struct acpi_device *adev = nfit_mem->adev;
92
93 if (!adev)
94 return -ENOTTY;
95 dimm_name = nvdimm_name(nvdimm);
96 cmd_name = nvdimm_cmd_name(cmd);
97 dsm_mask = nfit_mem->dsm_mask;
98 desc = nd_cmd_dimm_desc(cmd);
99 uuid = to_nfit_uuid(NFIT_DEV_DIMM);
100 handle = adev->handle;
101 } else {
102 struct acpi_device *adev = to_acpi_dev(acpi_desc);
103
104 cmd_name = nvdimm_bus_cmd_name(cmd);
105 dsm_mask = nd_desc->dsm_mask;
106 desc = nd_cmd_bus_desc(cmd);
107 uuid = to_nfit_uuid(NFIT_DEV_BUS);
108 handle = adev->handle;
109 dimm_name = "bus";
110 }
111
112 if (!desc || (cmd && (desc->out_num + desc->in_num == 0)))
113 return -ENOTTY;
114
115 if (!test_bit(cmd, &dsm_mask))
116 return -ENOTTY;
117
118 in_obj.type = ACPI_TYPE_PACKAGE;
119 in_obj.package.count = 1;
120 in_obj.package.elements = &in_buf;
121 in_buf.type = ACPI_TYPE_BUFFER;
122 in_buf.buffer.pointer = buf;
123 in_buf.buffer.length = 0;
124
125 /* libnvdimm has already validated the input envelope */
126 for (i = 0; i < desc->in_num; i++)
127 in_buf.buffer.length += nd_cmd_in_size(nvdimm, cmd, desc,
128 i, buf);
129
130 if (IS_ENABLED(CONFIG_ACPI_NFIT_DEBUG)) {
131 dev_dbg(dev, "%s:%s cmd: %s input length: %d\n", __func__,
132 dimm_name, cmd_name, in_buf.buffer.length);
133 print_hex_dump_debug(cmd_name, DUMP_PREFIX_OFFSET, 4,
134 4, in_buf.buffer.pointer, min_t(u32, 128,
135 in_buf.buffer.length), true);
136 }
137
138 out_obj = acpi_evaluate_dsm(handle, uuid, 1, cmd, &in_obj);
139 if (!out_obj) {
140 dev_dbg(dev, "%s:%s _DSM failed cmd: %s\n", __func__, dimm_name,
141 cmd_name);
142 return -EINVAL;
143 }
144
145 if (out_obj->package.type != ACPI_TYPE_BUFFER) {
146 dev_dbg(dev, "%s:%s unexpected output object type cmd: %s type: %d\n",
147 __func__, dimm_name, cmd_name, out_obj->type);
148 rc = -EINVAL;
149 goto out;
150 }
151
152 if (IS_ENABLED(CONFIG_ACPI_NFIT_DEBUG)) {
153 dev_dbg(dev, "%s:%s cmd: %s output length: %d\n", __func__,
154 dimm_name, cmd_name, out_obj->buffer.length);
155 print_hex_dump_debug(cmd_name, DUMP_PREFIX_OFFSET, 4,
156 4, out_obj->buffer.pointer, min_t(u32, 128,
157 out_obj->buffer.length), true);
158 }
159
160 for (i = 0, offset = 0; i < desc->out_num; i++) {
161 u32 out_size = nd_cmd_out_size(nvdimm, cmd, desc, i, buf,
162 (u32 *) out_obj->buffer.pointer);
163
164 if (offset + out_size > out_obj->buffer.length) {
165 dev_dbg(dev, "%s:%s output object underflow cmd: %s field: %d\n",
166 __func__, dimm_name, cmd_name, i);
167 break;
168 }
169
170 if (in_buf.buffer.length + offset + out_size > buf_len) {
171 dev_dbg(dev, "%s:%s output overrun cmd: %s field: %d\n",
172 __func__, dimm_name, cmd_name, i);
173 rc = -ENXIO;
174 goto out;
175 }
176 memcpy(buf + in_buf.buffer.length + offset,
177 out_obj->buffer.pointer + offset, out_size);
178 offset += out_size;
179 }
180 if (offset + in_buf.buffer.length < buf_len) {
181 if (i >= 1) {
182 /*
183 * status valid, return the number of bytes left
184 * unfilled in the output buffer
185 */
186 rc = buf_len - offset - in_buf.buffer.length;
187 } else {
188 dev_err(dev, "%s:%s underrun cmd: %s buf_len: %d out_len: %d\n",
189 __func__, dimm_name, cmd_name, buf_len,
190 offset);
191 rc = -ENXIO;
192 }
193 } else
194 rc = 0;
195
196 out:
197 ACPI_FREE(out_obj);
198
199 return rc;
200 }
201
202 static const char *spa_type_name(u16 type)
203 {
204 static const char *to_name[] = {
205 [NFIT_SPA_VOLATILE] = "volatile",
206 [NFIT_SPA_PM] = "pmem",
207 [NFIT_SPA_DCR] = "dimm-control-region",
208 [NFIT_SPA_BDW] = "block-data-window",
209 [NFIT_SPA_VDISK] = "volatile-disk",
210 [NFIT_SPA_VCD] = "volatile-cd",
211 [NFIT_SPA_PDISK] = "persistent-disk",
212 [NFIT_SPA_PCD] = "persistent-cd",
213
214 };
215
216 if (type > NFIT_SPA_PCD)
217 return "unknown";
218
219 return to_name[type];
220 }
221
222 static int nfit_spa_type(struct acpi_nfit_system_address *spa)
223 {
224 int i;
225
226 for (i = 0; i < NFIT_UUID_MAX; i++)
227 if (memcmp(to_nfit_uuid(i), spa->range_guid, 16) == 0)
228 return i;
229 return -1;
230 }
231
232 static bool add_spa(struct acpi_nfit_desc *acpi_desc,
233 struct nfit_table_prev *prev,
234 struct acpi_nfit_system_address *spa)
235 {
236 struct device *dev = acpi_desc->dev;
237 struct nfit_spa *nfit_spa;
238
239 list_for_each_entry(nfit_spa, &prev->spas, list) {
240 if (memcmp(nfit_spa->spa, spa, sizeof(*spa)) == 0) {
241 list_move_tail(&nfit_spa->list, &acpi_desc->spas);
242 return true;
243 }
244 }
245
246 nfit_spa = devm_kzalloc(dev, sizeof(*nfit_spa), GFP_KERNEL);
247 if (!nfit_spa)
248 return false;
249 INIT_LIST_HEAD(&nfit_spa->list);
250 nfit_spa->spa = spa;
251 list_add_tail(&nfit_spa->list, &acpi_desc->spas);
252 dev_dbg(dev, "%s: spa index: %d type: %s\n", __func__,
253 spa->range_index,
254 spa_type_name(nfit_spa_type(spa)));
255 return true;
256 }
257
258 static bool add_memdev(struct acpi_nfit_desc *acpi_desc,
259 struct nfit_table_prev *prev,
260 struct acpi_nfit_memory_map *memdev)
261 {
262 struct device *dev = acpi_desc->dev;
263 struct nfit_memdev *nfit_memdev;
264
265 list_for_each_entry(nfit_memdev, &prev->memdevs, list)
266 if (memcmp(nfit_memdev->memdev, memdev, sizeof(*memdev)) == 0) {
267 list_move_tail(&nfit_memdev->list, &acpi_desc->memdevs);
268 return true;
269 }
270
271 nfit_memdev = devm_kzalloc(dev, sizeof(*nfit_memdev), GFP_KERNEL);
272 if (!nfit_memdev)
273 return false;
274 INIT_LIST_HEAD(&nfit_memdev->list);
275 nfit_memdev->memdev = memdev;
276 list_add_tail(&nfit_memdev->list, &acpi_desc->memdevs);
277 dev_dbg(dev, "%s: memdev handle: %#x spa: %d dcr: %d\n",
278 __func__, memdev->device_handle, memdev->range_index,
279 memdev->region_index);
280 return true;
281 }
282
283 static bool add_dcr(struct acpi_nfit_desc *acpi_desc,
284 struct nfit_table_prev *prev,
285 struct acpi_nfit_control_region *dcr)
286 {
287 struct device *dev = acpi_desc->dev;
288 struct nfit_dcr *nfit_dcr;
289
290 list_for_each_entry(nfit_dcr, &prev->dcrs, list)
291 if (memcmp(nfit_dcr->dcr, dcr, sizeof(*dcr)) == 0) {
292 list_move_tail(&nfit_dcr->list, &acpi_desc->dcrs);
293 return true;
294 }
295
296 nfit_dcr = devm_kzalloc(dev, sizeof(*nfit_dcr), GFP_KERNEL);
297 if (!nfit_dcr)
298 return false;
299 INIT_LIST_HEAD(&nfit_dcr->list);
300 nfit_dcr->dcr = dcr;
301 list_add_tail(&nfit_dcr->list, &acpi_desc->dcrs);
302 dev_dbg(dev, "%s: dcr index: %d windows: %d\n", __func__,
303 dcr->region_index, dcr->windows);
304 return true;
305 }
306
307 static bool add_bdw(struct acpi_nfit_desc *acpi_desc,
308 struct nfit_table_prev *prev,
309 struct acpi_nfit_data_region *bdw)
310 {
311 struct device *dev = acpi_desc->dev;
312 struct nfit_bdw *nfit_bdw;
313
314 list_for_each_entry(nfit_bdw, &prev->bdws, list)
315 if (memcmp(nfit_bdw->bdw, bdw, sizeof(*bdw)) == 0) {
316 list_move_tail(&nfit_bdw->list, &acpi_desc->bdws);
317 return true;
318 }
319
320 nfit_bdw = devm_kzalloc(dev, sizeof(*nfit_bdw), GFP_KERNEL);
321 if (!nfit_bdw)
322 return false;
323 INIT_LIST_HEAD(&nfit_bdw->list);
324 nfit_bdw->bdw = bdw;
325 list_add_tail(&nfit_bdw->list, &acpi_desc->bdws);
326 dev_dbg(dev, "%s: bdw dcr: %d windows: %d\n", __func__,
327 bdw->region_index, bdw->windows);
328 return true;
329 }
330
331 static bool add_idt(struct acpi_nfit_desc *acpi_desc,
332 struct nfit_table_prev *prev,
333 struct acpi_nfit_interleave *idt)
334 {
335 struct device *dev = acpi_desc->dev;
336 struct nfit_idt *nfit_idt;
337
338 list_for_each_entry(nfit_idt, &prev->idts, list)
339 if (memcmp(nfit_idt->idt, idt, sizeof(*idt)) == 0) {
340 list_move_tail(&nfit_idt->list, &acpi_desc->idts);
341 return true;
342 }
343
344 nfit_idt = devm_kzalloc(dev, sizeof(*nfit_idt), GFP_KERNEL);
345 if (!nfit_idt)
346 return false;
347 INIT_LIST_HEAD(&nfit_idt->list);
348 nfit_idt->idt = idt;
349 list_add_tail(&nfit_idt->list, &acpi_desc->idts);
350 dev_dbg(dev, "%s: idt index: %d num_lines: %d\n", __func__,
351 idt->interleave_index, idt->line_count);
352 return true;
353 }
354
355 static bool add_flush(struct acpi_nfit_desc *acpi_desc,
356 struct nfit_table_prev *prev,
357 struct acpi_nfit_flush_address *flush)
358 {
359 struct device *dev = acpi_desc->dev;
360 struct nfit_flush *nfit_flush;
361
362 list_for_each_entry(nfit_flush, &prev->flushes, list)
363 if (memcmp(nfit_flush->flush, flush, sizeof(*flush)) == 0) {
364 list_move_tail(&nfit_flush->list, &acpi_desc->flushes);
365 return true;
366 }
367
368 nfit_flush = devm_kzalloc(dev, sizeof(*nfit_flush), GFP_KERNEL);
369 if (!nfit_flush)
370 return false;
371 INIT_LIST_HEAD(&nfit_flush->list);
372 nfit_flush->flush = flush;
373 list_add_tail(&nfit_flush->list, &acpi_desc->flushes);
374 dev_dbg(dev, "%s: nfit_flush handle: %d hint_count: %d\n", __func__,
375 flush->device_handle, flush->hint_count);
376 return true;
377 }
378
379 static void *add_table(struct acpi_nfit_desc *acpi_desc,
380 struct nfit_table_prev *prev, void *table, const void *end)
381 {
382 struct device *dev = acpi_desc->dev;
383 struct acpi_nfit_header *hdr;
384 void *err = ERR_PTR(-ENOMEM);
385
386 if (table >= end)
387 return NULL;
388
389 hdr = table;
390 if (!hdr->length) {
391 dev_warn(dev, "found a zero length table '%d' parsing nfit\n",
392 hdr->type);
393 return NULL;
394 }
395
396 switch (hdr->type) {
397 case ACPI_NFIT_TYPE_SYSTEM_ADDRESS:
398 if (!add_spa(acpi_desc, prev, table))
399 return err;
400 break;
401 case ACPI_NFIT_TYPE_MEMORY_MAP:
402 if (!add_memdev(acpi_desc, prev, table))
403 return err;
404 break;
405 case ACPI_NFIT_TYPE_CONTROL_REGION:
406 if (!add_dcr(acpi_desc, prev, table))
407 return err;
408 break;
409 case ACPI_NFIT_TYPE_DATA_REGION:
410 if (!add_bdw(acpi_desc, prev, table))
411 return err;
412 break;
413 case ACPI_NFIT_TYPE_INTERLEAVE:
414 if (!add_idt(acpi_desc, prev, table))
415 return err;
416 break;
417 case ACPI_NFIT_TYPE_FLUSH_ADDRESS:
418 if (!add_flush(acpi_desc, prev, table))
419 return err;
420 break;
421 case ACPI_NFIT_TYPE_SMBIOS:
422 dev_dbg(dev, "%s: smbios\n", __func__);
423 break;
424 default:
425 dev_err(dev, "unknown table '%d' parsing nfit\n", hdr->type);
426 break;
427 }
428
429 return table + hdr->length;
430 }
431
432 static void nfit_mem_find_spa_bdw(struct acpi_nfit_desc *acpi_desc,
433 struct nfit_mem *nfit_mem)
434 {
435 u32 device_handle = __to_nfit_memdev(nfit_mem)->device_handle;
436 u16 dcr = nfit_mem->dcr->region_index;
437 struct nfit_spa *nfit_spa;
438
439 list_for_each_entry(nfit_spa, &acpi_desc->spas, list) {
440 u16 range_index = nfit_spa->spa->range_index;
441 int type = nfit_spa_type(nfit_spa->spa);
442 struct nfit_memdev *nfit_memdev;
443
444 if (type != NFIT_SPA_BDW)
445 continue;
446
447 list_for_each_entry(nfit_memdev, &acpi_desc->memdevs, list) {
448 if (nfit_memdev->memdev->range_index != range_index)
449 continue;
450 if (nfit_memdev->memdev->device_handle != device_handle)
451 continue;
452 if (nfit_memdev->memdev->region_index != dcr)
453 continue;
454
455 nfit_mem->spa_bdw = nfit_spa->spa;
456 return;
457 }
458 }
459
460 dev_dbg(acpi_desc->dev, "SPA-BDW not found for SPA-DCR %d\n",
461 nfit_mem->spa_dcr->range_index);
462 nfit_mem->bdw = NULL;
463 }
464
465 static int nfit_mem_add(struct acpi_nfit_desc *acpi_desc,
466 struct nfit_mem *nfit_mem, struct acpi_nfit_system_address *spa)
467 {
468 u16 dcr = __to_nfit_memdev(nfit_mem)->region_index;
469 struct nfit_memdev *nfit_memdev;
470 struct nfit_flush *nfit_flush;
471 struct nfit_dcr *nfit_dcr;
472 struct nfit_bdw *nfit_bdw;
473 struct nfit_idt *nfit_idt;
474 u16 idt_idx, range_index;
475
476 list_for_each_entry(nfit_dcr, &acpi_desc->dcrs, list) {
477 if (nfit_dcr->dcr->region_index != dcr)
478 continue;
479 nfit_mem->dcr = nfit_dcr->dcr;
480 break;
481 }
482
483 if (!nfit_mem->dcr) {
484 dev_dbg(acpi_desc->dev, "SPA %d missing:%s%s\n",
485 spa->range_index, __to_nfit_memdev(nfit_mem)
486 ? "" : " MEMDEV", nfit_mem->dcr ? "" : " DCR");
487 return -ENODEV;
488 }
489
490 /*
491 * We've found enough to create an nvdimm, optionally
492 * find an associated BDW
493 */
494 list_add(&nfit_mem->list, &acpi_desc->dimms);
495
496 list_for_each_entry(nfit_bdw, &acpi_desc->bdws, list) {
497 if (nfit_bdw->bdw->region_index != dcr)
498 continue;
499 nfit_mem->bdw = nfit_bdw->bdw;
500 break;
501 }
502
503 if (!nfit_mem->bdw)
504 return 0;
505
506 nfit_mem_find_spa_bdw(acpi_desc, nfit_mem);
507
508 if (!nfit_mem->spa_bdw)
509 return 0;
510
511 range_index = nfit_mem->spa_bdw->range_index;
512 list_for_each_entry(nfit_memdev, &acpi_desc->memdevs, list) {
513 if (nfit_memdev->memdev->range_index != range_index ||
514 nfit_memdev->memdev->region_index != dcr)
515 continue;
516 nfit_mem->memdev_bdw = nfit_memdev->memdev;
517 idt_idx = nfit_memdev->memdev->interleave_index;
518 list_for_each_entry(nfit_idt, &acpi_desc->idts, list) {
519 if (nfit_idt->idt->interleave_index != idt_idx)
520 continue;
521 nfit_mem->idt_bdw = nfit_idt->idt;
522 break;
523 }
524
525 list_for_each_entry(nfit_flush, &acpi_desc->flushes, list) {
526 if (nfit_flush->flush->device_handle !=
527 nfit_memdev->memdev->device_handle)
528 continue;
529 nfit_mem->nfit_flush = nfit_flush;
530 break;
531 }
532 break;
533 }
534
535 return 0;
536 }
537
538 static int nfit_mem_dcr_init(struct acpi_nfit_desc *acpi_desc,
539 struct acpi_nfit_system_address *spa)
540 {
541 struct nfit_mem *nfit_mem, *found;
542 struct nfit_memdev *nfit_memdev;
543 int type = nfit_spa_type(spa);
544 u16 dcr;
545
546 switch (type) {
547 case NFIT_SPA_DCR:
548 case NFIT_SPA_PM:
549 break;
550 default:
551 return 0;
552 }
553
554 list_for_each_entry(nfit_memdev, &acpi_desc->memdevs, list) {
555 int rc;
556
557 if (nfit_memdev->memdev->range_index != spa->range_index)
558 continue;
559 found = NULL;
560 dcr = nfit_memdev->memdev->region_index;
561 list_for_each_entry(nfit_mem, &acpi_desc->dimms, list)
562 if (__to_nfit_memdev(nfit_mem)->region_index == dcr) {
563 found = nfit_mem;
564 break;
565 }
566
567 if (found)
568 nfit_mem = found;
569 else {
570 nfit_mem = devm_kzalloc(acpi_desc->dev,
571 sizeof(*nfit_mem), GFP_KERNEL);
572 if (!nfit_mem)
573 return -ENOMEM;
574 INIT_LIST_HEAD(&nfit_mem->list);
575 }
576
577 if (type == NFIT_SPA_DCR) {
578 struct nfit_idt *nfit_idt;
579 u16 idt_idx;
580
581 /* multiple dimms may share a SPA when interleaved */
582 nfit_mem->spa_dcr = spa;
583 nfit_mem->memdev_dcr = nfit_memdev->memdev;
584 idt_idx = nfit_memdev->memdev->interleave_index;
585 list_for_each_entry(nfit_idt, &acpi_desc->idts, list) {
586 if (nfit_idt->idt->interleave_index != idt_idx)
587 continue;
588 nfit_mem->idt_dcr = nfit_idt->idt;
589 break;
590 }
591 } else {
592 /*
593 * A single dimm may belong to multiple SPA-PM
594 * ranges, record at least one in addition to
595 * any SPA-DCR range.
596 */
597 nfit_mem->memdev_pmem = nfit_memdev->memdev;
598 }
599
600 if (found)
601 continue;
602
603 rc = nfit_mem_add(acpi_desc, nfit_mem, spa);
604 if (rc)
605 return rc;
606 }
607
608 return 0;
609 }
610
611 static int nfit_mem_cmp(void *priv, struct list_head *_a, struct list_head *_b)
612 {
613 struct nfit_mem *a = container_of(_a, typeof(*a), list);
614 struct nfit_mem *b = container_of(_b, typeof(*b), list);
615 u32 handleA, handleB;
616
617 handleA = __to_nfit_memdev(a)->device_handle;
618 handleB = __to_nfit_memdev(b)->device_handle;
619 if (handleA < handleB)
620 return -1;
621 else if (handleA > handleB)
622 return 1;
623 return 0;
624 }
625
626 static int nfit_mem_init(struct acpi_nfit_desc *acpi_desc)
627 {
628 struct nfit_spa *nfit_spa;
629
630 /*
631 * For each SPA-DCR or SPA-PMEM address range find its
632 * corresponding MEMDEV(s). From each MEMDEV find the
633 * corresponding DCR. Then, if we're operating on a SPA-DCR,
634 * try to find a SPA-BDW and a corresponding BDW that references
635 * the DCR. Throw it all into an nfit_mem object. Note, that
636 * BDWs are optional.
637 */
638 list_for_each_entry(nfit_spa, &acpi_desc->spas, list) {
639 int rc;
640
641 rc = nfit_mem_dcr_init(acpi_desc, nfit_spa->spa);
642 if (rc)
643 return rc;
644 }
645
646 list_sort(NULL, &acpi_desc->dimms, nfit_mem_cmp);
647
648 return 0;
649 }
650
651 static ssize_t revision_show(struct device *dev,
652 struct device_attribute *attr, char *buf)
653 {
654 struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev);
655 struct nvdimm_bus_descriptor *nd_desc = to_nd_desc(nvdimm_bus);
656 struct acpi_nfit_desc *acpi_desc = to_acpi_desc(nd_desc);
657
658 return sprintf(buf, "%d\n", acpi_desc->nfit->header.revision);
659 }
660 static DEVICE_ATTR_RO(revision);
661
662 static struct attribute *acpi_nfit_attributes[] = {
663 &dev_attr_revision.attr,
664 NULL,
665 };
666
667 static struct attribute_group acpi_nfit_attribute_group = {
668 .name = "nfit",
669 .attrs = acpi_nfit_attributes,
670 };
671
672 const struct attribute_group *acpi_nfit_attribute_groups[] = {
673 &nvdimm_bus_attribute_group,
674 &acpi_nfit_attribute_group,
675 NULL,
676 };
677 EXPORT_SYMBOL_GPL(acpi_nfit_attribute_groups);
678
679 static struct acpi_nfit_memory_map *to_nfit_memdev(struct device *dev)
680 {
681 struct nvdimm *nvdimm = to_nvdimm(dev);
682 struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
683
684 return __to_nfit_memdev(nfit_mem);
685 }
686
687 static struct acpi_nfit_control_region *to_nfit_dcr(struct device *dev)
688 {
689 struct nvdimm *nvdimm = to_nvdimm(dev);
690 struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
691
692 return nfit_mem->dcr;
693 }
694
695 static ssize_t handle_show(struct device *dev,
696 struct device_attribute *attr, char *buf)
697 {
698 struct acpi_nfit_memory_map *memdev = to_nfit_memdev(dev);
699
700 return sprintf(buf, "%#x\n", memdev->device_handle);
701 }
702 static DEVICE_ATTR_RO(handle);
703
704 static ssize_t phys_id_show(struct device *dev,
705 struct device_attribute *attr, char *buf)
706 {
707 struct acpi_nfit_memory_map *memdev = to_nfit_memdev(dev);
708
709 return sprintf(buf, "%#x\n", memdev->physical_id);
710 }
711 static DEVICE_ATTR_RO(phys_id);
712
713 static ssize_t vendor_show(struct device *dev,
714 struct device_attribute *attr, char *buf)
715 {
716 struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev);
717
718 return sprintf(buf, "%#x\n", dcr->vendor_id);
719 }
720 static DEVICE_ATTR_RO(vendor);
721
722 static ssize_t rev_id_show(struct device *dev,
723 struct device_attribute *attr, char *buf)
724 {
725 struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev);
726
727 return sprintf(buf, "%#x\n", dcr->revision_id);
728 }
729 static DEVICE_ATTR_RO(rev_id);
730
731 static ssize_t device_show(struct device *dev,
732 struct device_attribute *attr, char *buf)
733 {
734 struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev);
735
736 return sprintf(buf, "%#x\n", dcr->device_id);
737 }
738 static DEVICE_ATTR_RO(device);
739
740 static ssize_t format_show(struct device *dev,
741 struct device_attribute *attr, char *buf)
742 {
743 struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev);
744
745 return sprintf(buf, "%#x\n", dcr->code);
746 }
747 static DEVICE_ATTR_RO(format);
748
749 static ssize_t serial_show(struct device *dev,
750 struct device_attribute *attr, char *buf)
751 {
752 struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev);
753
754 return sprintf(buf, "%#x\n", dcr->serial_number);
755 }
756 static DEVICE_ATTR_RO(serial);
757
758 static ssize_t flags_show(struct device *dev,
759 struct device_attribute *attr, char *buf)
760 {
761 u16 flags = to_nfit_memdev(dev)->flags;
762
763 return sprintf(buf, "%s%s%s%s%s\n",
764 flags & ACPI_NFIT_MEM_SAVE_FAILED ? "save_fail " : "",
765 flags & ACPI_NFIT_MEM_RESTORE_FAILED ? "restore_fail " : "",
766 flags & ACPI_NFIT_MEM_FLUSH_FAILED ? "flush_fail " : "",
767 flags & ACPI_NFIT_MEM_NOT_ARMED ? "not_armed " : "",
768 flags & ACPI_NFIT_MEM_HEALTH_OBSERVED ? "smart_event " : "");
769 }
770 static DEVICE_ATTR_RO(flags);
771
772 static struct attribute *acpi_nfit_dimm_attributes[] = {
773 &dev_attr_handle.attr,
774 &dev_attr_phys_id.attr,
775 &dev_attr_vendor.attr,
776 &dev_attr_device.attr,
777 &dev_attr_format.attr,
778 &dev_attr_serial.attr,
779 &dev_attr_rev_id.attr,
780 &dev_attr_flags.attr,
781 NULL,
782 };
783
784 static umode_t acpi_nfit_dimm_attr_visible(struct kobject *kobj,
785 struct attribute *a, int n)
786 {
787 struct device *dev = container_of(kobj, struct device, kobj);
788
789 if (to_nfit_dcr(dev))
790 return a->mode;
791 else
792 return 0;
793 }
794
795 static struct attribute_group acpi_nfit_dimm_attribute_group = {
796 .name = "nfit",
797 .attrs = acpi_nfit_dimm_attributes,
798 .is_visible = acpi_nfit_dimm_attr_visible,
799 };
800
801 static const struct attribute_group *acpi_nfit_dimm_attribute_groups[] = {
802 &nvdimm_attribute_group,
803 &nd_device_attribute_group,
804 &acpi_nfit_dimm_attribute_group,
805 NULL,
806 };
807
808 static struct nvdimm *acpi_nfit_dimm_by_handle(struct acpi_nfit_desc *acpi_desc,
809 u32 device_handle)
810 {
811 struct nfit_mem *nfit_mem;
812
813 list_for_each_entry(nfit_mem, &acpi_desc->dimms, list)
814 if (__to_nfit_memdev(nfit_mem)->device_handle == device_handle)
815 return nfit_mem->nvdimm;
816
817 return NULL;
818 }
819
820 static int acpi_nfit_add_dimm(struct acpi_nfit_desc *acpi_desc,
821 struct nfit_mem *nfit_mem, u32 device_handle)
822 {
823 struct acpi_device *adev, *adev_dimm;
824 struct device *dev = acpi_desc->dev;
825 const u8 *uuid = to_nfit_uuid(NFIT_DEV_DIMM);
826 int i;
827
828 nfit_mem->dsm_mask = acpi_desc->dimm_dsm_force_en;
829 adev = to_acpi_dev(acpi_desc);
830 if (!adev)
831 return 0;
832
833 adev_dimm = acpi_find_child_device(adev, device_handle, false);
834 nfit_mem->adev = adev_dimm;
835 if (!adev_dimm) {
836 dev_err(dev, "no ACPI.NFIT device with _ADR %#x, disabling...\n",
837 device_handle);
838 return force_enable_dimms ? 0 : -ENODEV;
839 }
840
841 for (i = ND_CMD_SMART; i <= ND_CMD_VENDOR; i++)
842 if (acpi_check_dsm(adev_dimm->handle, uuid, 1, 1ULL << i))
843 set_bit(i, &nfit_mem->dsm_mask);
844
845 return 0;
846 }
847
848 static int acpi_nfit_register_dimms(struct acpi_nfit_desc *acpi_desc)
849 {
850 struct nfit_mem *nfit_mem;
851 int dimm_count = 0;
852
853 list_for_each_entry(nfit_mem, &acpi_desc->dimms, list) {
854 struct nvdimm *nvdimm;
855 unsigned long flags = 0;
856 u32 device_handle;
857 u16 mem_flags;
858 int rc;
859
860 device_handle = __to_nfit_memdev(nfit_mem)->device_handle;
861 nvdimm = acpi_nfit_dimm_by_handle(acpi_desc, device_handle);
862 if (nvdimm) {
863 dimm_count++;
864 continue;
865 }
866
867 if (nfit_mem->bdw && nfit_mem->memdev_pmem)
868 flags |= NDD_ALIASING;
869
870 mem_flags = __to_nfit_memdev(nfit_mem)->flags;
871 if (mem_flags & ACPI_NFIT_MEM_NOT_ARMED)
872 flags |= NDD_UNARMED;
873
874 rc = acpi_nfit_add_dimm(acpi_desc, nfit_mem, device_handle);
875 if (rc)
876 continue;
877
878 nvdimm = nvdimm_create(acpi_desc->nvdimm_bus, nfit_mem,
879 acpi_nfit_dimm_attribute_groups,
880 flags, &nfit_mem->dsm_mask);
881 if (!nvdimm)
882 return -ENOMEM;
883
884 nfit_mem->nvdimm = nvdimm;
885 dimm_count++;
886
887 if ((mem_flags & ACPI_NFIT_MEM_FAILED_MASK) == 0)
888 continue;
889
890 dev_info(acpi_desc->dev, "%s flags:%s%s%s%s\n",
891 nvdimm_name(nvdimm),
892 mem_flags & ACPI_NFIT_MEM_SAVE_FAILED ? " save_fail" : "",
893 mem_flags & ACPI_NFIT_MEM_RESTORE_FAILED ? " restore_fail":"",
894 mem_flags & ACPI_NFIT_MEM_FLUSH_FAILED ? " flush_fail" : "",
895 mem_flags & ACPI_NFIT_MEM_NOT_ARMED ? " not_armed" : "");
896
897 }
898
899 return nvdimm_bus_check_dimm_count(acpi_desc->nvdimm_bus, dimm_count);
900 }
901
902 static void acpi_nfit_init_dsms(struct acpi_nfit_desc *acpi_desc)
903 {
904 struct nvdimm_bus_descriptor *nd_desc = &acpi_desc->nd_desc;
905 const u8 *uuid = to_nfit_uuid(NFIT_DEV_BUS);
906 struct acpi_device *adev;
907 int i;
908
909 nd_desc->dsm_mask = acpi_desc->bus_dsm_force_en;
910 adev = to_acpi_dev(acpi_desc);
911 if (!adev)
912 return;
913
914 for (i = ND_CMD_ARS_CAP; i <= ND_CMD_ARS_STATUS; i++)
915 if (acpi_check_dsm(adev->handle, uuid, 1, 1ULL << i))
916 set_bit(i, &nd_desc->dsm_mask);
917 }
918
919 static ssize_t range_index_show(struct device *dev,
920 struct device_attribute *attr, char *buf)
921 {
922 struct nd_region *nd_region = to_nd_region(dev);
923 struct nfit_spa *nfit_spa = nd_region_provider_data(nd_region);
924
925 return sprintf(buf, "%d\n", nfit_spa->spa->range_index);
926 }
927 static DEVICE_ATTR_RO(range_index);
928
929 static struct attribute *acpi_nfit_region_attributes[] = {
930 &dev_attr_range_index.attr,
931 NULL,
932 };
933
934 static struct attribute_group acpi_nfit_region_attribute_group = {
935 .name = "nfit",
936 .attrs = acpi_nfit_region_attributes,
937 };
938
939 static const struct attribute_group *acpi_nfit_region_attribute_groups[] = {
940 &nd_region_attribute_group,
941 &nd_mapping_attribute_group,
942 &nd_device_attribute_group,
943 &nd_numa_attribute_group,
944 &acpi_nfit_region_attribute_group,
945 NULL,
946 };
947
948 /* enough info to uniquely specify an interleave set */
949 struct nfit_set_info {
950 struct nfit_set_info_map {
951 u64 region_offset;
952 u32 serial_number;
953 u32 pad;
954 } mapping[0];
955 };
956
957 static size_t sizeof_nfit_set_info(int num_mappings)
958 {
959 return sizeof(struct nfit_set_info)
960 + num_mappings * sizeof(struct nfit_set_info_map);
961 }
962
963 static int cmp_map(const void *m0, const void *m1)
964 {
965 const struct nfit_set_info_map *map0 = m0;
966 const struct nfit_set_info_map *map1 = m1;
967
968 return memcmp(&map0->region_offset, &map1->region_offset,
969 sizeof(u64));
970 }
971
972 /* Retrieve the nth entry referencing this spa */
973 static struct acpi_nfit_memory_map *memdev_from_spa(
974 struct acpi_nfit_desc *acpi_desc, u16 range_index, int n)
975 {
976 struct nfit_memdev *nfit_memdev;
977
978 list_for_each_entry(nfit_memdev, &acpi_desc->memdevs, list)
979 if (nfit_memdev->memdev->range_index == range_index)
980 if (n-- == 0)
981 return nfit_memdev->memdev;
982 return NULL;
983 }
984
985 static int acpi_nfit_init_interleave_set(struct acpi_nfit_desc *acpi_desc,
986 struct nd_region_desc *ndr_desc,
987 struct acpi_nfit_system_address *spa)
988 {
989 int i, spa_type = nfit_spa_type(spa);
990 struct device *dev = acpi_desc->dev;
991 struct nd_interleave_set *nd_set;
992 u16 nr = ndr_desc->num_mappings;
993 struct nfit_set_info *info;
994
995 if (spa_type == NFIT_SPA_PM || spa_type == NFIT_SPA_VOLATILE)
996 /* pass */;
997 else
998 return 0;
999
1000 nd_set = devm_kzalloc(dev, sizeof(*nd_set), GFP_KERNEL);
1001 if (!nd_set)
1002 return -ENOMEM;
1003
1004 info = devm_kzalloc(dev, sizeof_nfit_set_info(nr), GFP_KERNEL);
1005 if (!info)
1006 return -ENOMEM;
1007 for (i = 0; i < nr; i++) {
1008 struct nd_mapping *nd_mapping = &ndr_desc->nd_mapping[i];
1009 struct nfit_set_info_map *map = &info->mapping[i];
1010 struct nvdimm *nvdimm = nd_mapping->nvdimm;
1011 struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
1012 struct acpi_nfit_memory_map *memdev = memdev_from_spa(acpi_desc,
1013 spa->range_index, i);
1014
1015 if (!memdev || !nfit_mem->dcr) {
1016 dev_err(dev, "%s: failed to find DCR\n", __func__);
1017 return -ENODEV;
1018 }
1019
1020 map->region_offset = memdev->region_offset;
1021 map->serial_number = nfit_mem->dcr->serial_number;
1022 }
1023
1024 sort(&info->mapping[0], nr, sizeof(struct nfit_set_info_map),
1025 cmp_map, NULL);
1026 nd_set->cookie = nd_fletcher64(info, sizeof_nfit_set_info(nr), 0);
1027 ndr_desc->nd_set = nd_set;
1028 devm_kfree(dev, info);
1029
1030 return 0;
1031 }
1032
1033 static u64 to_interleave_offset(u64 offset, struct nfit_blk_mmio *mmio)
1034 {
1035 struct acpi_nfit_interleave *idt = mmio->idt;
1036 u32 sub_line_offset, line_index, line_offset;
1037 u64 line_no, table_skip_count, table_offset;
1038
1039 line_no = div_u64_rem(offset, mmio->line_size, &sub_line_offset);
1040 table_skip_count = div_u64_rem(line_no, mmio->num_lines, &line_index);
1041 line_offset = idt->line_offset[line_index]
1042 * mmio->line_size;
1043 table_offset = table_skip_count * mmio->table_size;
1044
1045 return mmio->base_offset + line_offset + table_offset + sub_line_offset;
1046 }
1047
1048 static void wmb_blk(struct nfit_blk *nfit_blk)
1049 {
1050
1051 if (nfit_blk->nvdimm_flush) {
1052 /*
1053 * The first wmb() is needed to 'sfence' all previous writes
1054 * such that they are architecturally visible for the platform
1055 * buffer flush. Note that we've already arranged for pmem
1056 * writes to avoid the cache via arch_memcpy_to_pmem(). The
1057 * final wmb() ensures ordering for the NVDIMM flush write.
1058 */
1059 wmb();
1060 writeq(1, nfit_blk->nvdimm_flush);
1061 wmb();
1062 } else
1063 wmb_pmem();
1064 }
1065
1066 static u32 read_blk_stat(struct nfit_blk *nfit_blk, unsigned int bw)
1067 {
1068 struct nfit_blk_mmio *mmio = &nfit_blk->mmio[DCR];
1069 u64 offset = nfit_blk->stat_offset + mmio->size * bw;
1070
1071 if (mmio->num_lines)
1072 offset = to_interleave_offset(offset, mmio);
1073
1074 return readl(mmio->addr.base + offset);
1075 }
1076
1077 static void write_blk_ctl(struct nfit_blk *nfit_blk, unsigned int bw,
1078 resource_size_t dpa, unsigned int len, unsigned int write)
1079 {
1080 u64 cmd, offset;
1081 struct nfit_blk_mmio *mmio = &nfit_blk->mmio[DCR];
1082
1083 enum {
1084 BCW_OFFSET_MASK = (1ULL << 48)-1,
1085 BCW_LEN_SHIFT = 48,
1086 BCW_LEN_MASK = (1ULL << 8) - 1,
1087 BCW_CMD_SHIFT = 56,
1088 };
1089
1090 cmd = (dpa >> L1_CACHE_SHIFT) & BCW_OFFSET_MASK;
1091 len = len >> L1_CACHE_SHIFT;
1092 cmd |= ((u64) len & BCW_LEN_MASK) << BCW_LEN_SHIFT;
1093 cmd |= ((u64) write) << BCW_CMD_SHIFT;
1094
1095 offset = nfit_blk->cmd_offset + mmio->size * bw;
1096 if (mmio->num_lines)
1097 offset = to_interleave_offset(offset, mmio);
1098
1099 writeq(cmd, mmio->addr.base + offset);
1100 wmb_blk(nfit_blk);
1101
1102 if (nfit_blk->dimm_flags & ND_BLK_DCR_LATCH)
1103 readq(mmio->addr.base + offset);
1104 }
1105
1106 static int acpi_nfit_blk_single_io(struct nfit_blk *nfit_blk,
1107 resource_size_t dpa, void *iobuf, size_t len, int rw,
1108 unsigned int lane)
1109 {
1110 struct nfit_blk_mmio *mmio = &nfit_blk->mmio[BDW];
1111 unsigned int copied = 0;
1112 u64 base_offset;
1113 int rc;
1114
1115 base_offset = nfit_blk->bdw_offset + dpa % L1_CACHE_BYTES
1116 + lane * mmio->size;
1117 write_blk_ctl(nfit_blk, lane, dpa, len, rw);
1118 while (len) {
1119 unsigned int c;
1120 u64 offset;
1121
1122 if (mmio->num_lines) {
1123 u32 line_offset;
1124
1125 offset = to_interleave_offset(base_offset + copied,
1126 mmio);
1127 div_u64_rem(offset, mmio->line_size, &line_offset);
1128 c = min_t(size_t, len, mmio->line_size - line_offset);
1129 } else {
1130 offset = base_offset + nfit_blk->bdw_offset;
1131 c = len;
1132 }
1133
1134 if (rw)
1135 memcpy_to_pmem(mmio->addr.aperture + offset,
1136 iobuf + copied, c);
1137 else {
1138 if (nfit_blk->dimm_flags & ND_BLK_READ_FLUSH)
1139 mmio_flush_range((void __force *)
1140 mmio->addr.aperture + offset, c);
1141
1142 memcpy_from_pmem(iobuf + copied,
1143 mmio->addr.aperture + offset, c);
1144 }
1145
1146 copied += c;
1147 len -= c;
1148 }
1149
1150 if (rw)
1151 wmb_blk(nfit_blk);
1152
1153 rc = read_blk_stat(nfit_blk, lane) ? -EIO : 0;
1154 return rc;
1155 }
1156
1157 static int acpi_nfit_blk_region_do_io(struct nd_blk_region *ndbr,
1158 resource_size_t dpa, void *iobuf, u64 len, int rw)
1159 {
1160 struct nfit_blk *nfit_blk = nd_blk_region_provider_data(ndbr);
1161 struct nfit_blk_mmio *mmio = &nfit_blk->mmio[BDW];
1162 struct nd_region *nd_region = nfit_blk->nd_region;
1163 unsigned int lane, copied = 0;
1164 int rc = 0;
1165
1166 lane = nd_region_acquire_lane(nd_region);
1167 while (len) {
1168 u64 c = min(len, mmio->size);
1169
1170 rc = acpi_nfit_blk_single_io(nfit_blk, dpa + copied,
1171 iobuf + copied, c, rw, lane);
1172 if (rc)
1173 break;
1174
1175 copied += c;
1176 len -= c;
1177 }
1178 nd_region_release_lane(nd_region, lane);
1179
1180 return rc;
1181 }
1182
1183 static void nfit_spa_mapping_release(struct kref *kref)
1184 {
1185 struct nfit_spa_mapping *spa_map = to_spa_map(kref);
1186 struct acpi_nfit_system_address *spa = spa_map->spa;
1187 struct acpi_nfit_desc *acpi_desc = spa_map->acpi_desc;
1188
1189 WARN_ON(!mutex_is_locked(&acpi_desc->spa_map_mutex));
1190 dev_dbg(acpi_desc->dev, "%s: SPA%d\n", __func__, spa->range_index);
1191 if (spa_map->type == SPA_MAP_APERTURE)
1192 memunmap((void __force *)spa_map->addr.aperture);
1193 else
1194 iounmap(spa_map->addr.base);
1195 release_mem_region(spa->address, spa->length);
1196 list_del(&spa_map->list);
1197 kfree(spa_map);
1198 }
1199
1200 static struct nfit_spa_mapping *find_spa_mapping(
1201 struct acpi_nfit_desc *acpi_desc,
1202 struct acpi_nfit_system_address *spa)
1203 {
1204 struct nfit_spa_mapping *spa_map;
1205
1206 WARN_ON(!mutex_is_locked(&acpi_desc->spa_map_mutex));
1207 list_for_each_entry(spa_map, &acpi_desc->spa_maps, list)
1208 if (spa_map->spa == spa)
1209 return spa_map;
1210
1211 return NULL;
1212 }
1213
1214 static void nfit_spa_unmap(struct acpi_nfit_desc *acpi_desc,
1215 struct acpi_nfit_system_address *spa)
1216 {
1217 struct nfit_spa_mapping *spa_map;
1218
1219 mutex_lock(&acpi_desc->spa_map_mutex);
1220 spa_map = find_spa_mapping(acpi_desc, spa);
1221
1222 if (spa_map)
1223 kref_put(&spa_map->kref, nfit_spa_mapping_release);
1224 mutex_unlock(&acpi_desc->spa_map_mutex);
1225 }
1226
1227 static void __iomem *__nfit_spa_map(struct acpi_nfit_desc *acpi_desc,
1228 struct acpi_nfit_system_address *spa, enum spa_map_type type)
1229 {
1230 resource_size_t start = spa->address;
1231 resource_size_t n = spa->length;
1232 struct nfit_spa_mapping *spa_map;
1233 struct resource *res;
1234
1235 WARN_ON(!mutex_is_locked(&acpi_desc->spa_map_mutex));
1236
1237 spa_map = find_spa_mapping(acpi_desc, spa);
1238 if (spa_map) {
1239 kref_get(&spa_map->kref);
1240 return spa_map->addr.base;
1241 }
1242
1243 spa_map = kzalloc(sizeof(*spa_map), GFP_KERNEL);
1244 if (!spa_map)
1245 return NULL;
1246
1247 INIT_LIST_HEAD(&spa_map->list);
1248 spa_map->spa = spa;
1249 kref_init(&spa_map->kref);
1250 spa_map->acpi_desc = acpi_desc;
1251
1252 res = request_mem_region(start, n, dev_name(acpi_desc->dev));
1253 if (!res)
1254 goto err_mem;
1255
1256 spa_map->type = type;
1257 if (type == SPA_MAP_APERTURE)
1258 spa_map->addr.aperture = (void __pmem *)memremap(start, n,
1259 ARCH_MEMREMAP_PMEM);
1260 else
1261 spa_map->addr.base = ioremap_nocache(start, n);
1262
1263
1264 if (!spa_map->addr.base)
1265 goto err_map;
1266
1267 list_add_tail(&spa_map->list, &acpi_desc->spa_maps);
1268 return spa_map->addr.base;
1269
1270 err_map:
1271 release_mem_region(start, n);
1272 err_mem:
1273 kfree(spa_map);
1274 return NULL;
1275 }
1276
1277 /**
1278 * nfit_spa_map - interleave-aware managed-mappings of acpi_nfit_system_address ranges
1279 * @nvdimm_bus: NFIT-bus that provided the spa table entry
1280 * @nfit_spa: spa table to map
1281 * @type: aperture or control region
1282 *
1283 * In the case where block-data-window apertures and
1284 * dimm-control-regions are interleaved they will end up sharing a
1285 * single request_mem_region() + ioremap() for the address range. In
1286 * the style of devm nfit_spa_map() mappings are automatically dropped
1287 * when all region devices referencing the same mapping are disabled /
1288 * unbound.
1289 */
1290 static void __iomem *nfit_spa_map(struct acpi_nfit_desc *acpi_desc,
1291 struct acpi_nfit_system_address *spa, enum spa_map_type type)
1292 {
1293 void __iomem *iomem;
1294
1295 mutex_lock(&acpi_desc->spa_map_mutex);
1296 iomem = __nfit_spa_map(acpi_desc, spa, type);
1297 mutex_unlock(&acpi_desc->spa_map_mutex);
1298
1299 return iomem;
1300 }
1301
1302 static int nfit_blk_init_interleave(struct nfit_blk_mmio *mmio,
1303 struct acpi_nfit_interleave *idt, u16 interleave_ways)
1304 {
1305 if (idt) {
1306 mmio->num_lines = idt->line_count;
1307 mmio->line_size = idt->line_size;
1308 if (interleave_ways == 0)
1309 return -ENXIO;
1310 mmio->table_size = mmio->num_lines * interleave_ways
1311 * mmio->line_size;
1312 }
1313
1314 return 0;
1315 }
1316
1317 static int acpi_nfit_blk_get_flags(struct nvdimm_bus_descriptor *nd_desc,
1318 struct nvdimm *nvdimm, struct nfit_blk *nfit_blk)
1319 {
1320 struct nd_cmd_dimm_flags flags;
1321 int rc;
1322
1323 memset(&flags, 0, sizeof(flags));
1324 rc = nd_desc->ndctl(nd_desc, nvdimm, ND_CMD_DIMM_FLAGS, &flags,
1325 sizeof(flags));
1326
1327 if (rc >= 0 && flags.status == 0)
1328 nfit_blk->dimm_flags = flags.flags;
1329 else if (rc == -ENOTTY) {
1330 /* fall back to a conservative default */
1331 nfit_blk->dimm_flags = ND_BLK_DCR_LATCH | ND_BLK_READ_FLUSH;
1332 rc = 0;
1333 } else
1334 rc = -ENXIO;
1335
1336 return rc;
1337 }
1338
1339 static int acpi_nfit_blk_region_enable(struct nvdimm_bus *nvdimm_bus,
1340 struct device *dev)
1341 {
1342 struct nvdimm_bus_descriptor *nd_desc = to_nd_desc(nvdimm_bus);
1343 struct acpi_nfit_desc *acpi_desc = to_acpi_desc(nd_desc);
1344 struct nd_blk_region *ndbr = to_nd_blk_region(dev);
1345 struct nfit_flush *nfit_flush;
1346 struct nfit_blk_mmio *mmio;
1347 struct nfit_blk *nfit_blk;
1348 struct nfit_mem *nfit_mem;
1349 struct nvdimm *nvdimm;
1350 int rc;
1351
1352 nvdimm = nd_blk_region_to_dimm(ndbr);
1353 nfit_mem = nvdimm_provider_data(nvdimm);
1354 if (!nfit_mem || !nfit_mem->dcr || !nfit_mem->bdw) {
1355 dev_dbg(dev, "%s: missing%s%s%s\n", __func__,
1356 nfit_mem ? "" : " nfit_mem",
1357 (nfit_mem && nfit_mem->dcr) ? "" : " dcr",
1358 (nfit_mem && nfit_mem->bdw) ? "" : " bdw");
1359 return -ENXIO;
1360 }
1361
1362 nfit_blk = devm_kzalloc(dev, sizeof(*nfit_blk), GFP_KERNEL);
1363 if (!nfit_blk)
1364 return -ENOMEM;
1365 nd_blk_region_set_provider_data(ndbr, nfit_blk);
1366 nfit_blk->nd_region = to_nd_region(dev);
1367
1368 /* map block aperture memory */
1369 nfit_blk->bdw_offset = nfit_mem->bdw->offset;
1370 mmio = &nfit_blk->mmio[BDW];
1371 mmio->addr.base = nfit_spa_map(acpi_desc, nfit_mem->spa_bdw,
1372 SPA_MAP_APERTURE);
1373 if (!mmio->addr.base) {
1374 dev_dbg(dev, "%s: %s failed to map bdw\n", __func__,
1375 nvdimm_name(nvdimm));
1376 return -ENOMEM;
1377 }
1378 mmio->size = nfit_mem->bdw->size;
1379 mmio->base_offset = nfit_mem->memdev_bdw->region_offset;
1380 mmio->idt = nfit_mem->idt_bdw;
1381 mmio->spa = nfit_mem->spa_bdw;
1382 rc = nfit_blk_init_interleave(mmio, nfit_mem->idt_bdw,
1383 nfit_mem->memdev_bdw->interleave_ways);
1384 if (rc) {
1385 dev_dbg(dev, "%s: %s failed to init bdw interleave\n",
1386 __func__, nvdimm_name(nvdimm));
1387 return rc;
1388 }
1389
1390 /* map block control memory */
1391 nfit_blk->cmd_offset = nfit_mem->dcr->command_offset;
1392 nfit_blk->stat_offset = nfit_mem->dcr->status_offset;
1393 mmio = &nfit_blk->mmio[DCR];
1394 mmio->addr.base = nfit_spa_map(acpi_desc, nfit_mem->spa_dcr,
1395 SPA_MAP_CONTROL);
1396 if (!mmio->addr.base) {
1397 dev_dbg(dev, "%s: %s failed to map dcr\n", __func__,
1398 nvdimm_name(nvdimm));
1399 return -ENOMEM;
1400 }
1401 mmio->size = nfit_mem->dcr->window_size;
1402 mmio->base_offset = nfit_mem->memdev_dcr->region_offset;
1403 mmio->idt = nfit_mem->idt_dcr;
1404 mmio->spa = nfit_mem->spa_dcr;
1405 rc = nfit_blk_init_interleave(mmio, nfit_mem->idt_dcr,
1406 nfit_mem->memdev_dcr->interleave_ways);
1407 if (rc) {
1408 dev_dbg(dev, "%s: %s failed to init dcr interleave\n",
1409 __func__, nvdimm_name(nvdimm));
1410 return rc;
1411 }
1412
1413 rc = acpi_nfit_blk_get_flags(nd_desc, nvdimm, nfit_blk);
1414 if (rc < 0) {
1415 dev_dbg(dev, "%s: %s failed get DIMM flags\n",
1416 __func__, nvdimm_name(nvdimm));
1417 return rc;
1418 }
1419
1420 nfit_flush = nfit_mem->nfit_flush;
1421 if (nfit_flush && nfit_flush->flush->hint_count != 0) {
1422 nfit_blk->nvdimm_flush = devm_ioremap_nocache(dev,
1423 nfit_flush->flush->hint_address[0], 8);
1424 if (!nfit_blk->nvdimm_flush)
1425 return -ENOMEM;
1426 }
1427
1428 if (!arch_has_wmb_pmem() && !nfit_blk->nvdimm_flush)
1429 dev_warn(dev, "unable to guarantee persistence of writes\n");
1430
1431 if (mmio->line_size == 0)
1432 return 0;
1433
1434 if ((u32) nfit_blk->cmd_offset % mmio->line_size
1435 + 8 > mmio->line_size) {
1436 dev_dbg(dev, "cmd_offset crosses interleave boundary\n");
1437 return -ENXIO;
1438 } else if ((u32) nfit_blk->stat_offset % mmio->line_size
1439 + 8 > mmio->line_size) {
1440 dev_dbg(dev, "stat_offset crosses interleave boundary\n");
1441 return -ENXIO;
1442 }
1443
1444 return 0;
1445 }
1446
1447 static void acpi_nfit_blk_region_disable(struct nvdimm_bus *nvdimm_bus,
1448 struct device *dev)
1449 {
1450 struct nvdimm_bus_descriptor *nd_desc = to_nd_desc(nvdimm_bus);
1451 struct acpi_nfit_desc *acpi_desc = to_acpi_desc(nd_desc);
1452 struct nd_blk_region *ndbr = to_nd_blk_region(dev);
1453 struct nfit_blk *nfit_blk = nd_blk_region_provider_data(ndbr);
1454 int i;
1455
1456 if (!nfit_blk)
1457 return; /* never enabled */
1458
1459 /* auto-free BLK spa mappings */
1460 for (i = 0; i < 2; i++) {
1461 struct nfit_blk_mmio *mmio = &nfit_blk->mmio[i];
1462
1463 if (mmio->addr.base)
1464 nfit_spa_unmap(acpi_desc, mmio->spa);
1465 }
1466 nd_blk_region_set_provider_data(ndbr, NULL);
1467 /* devm will free nfit_blk */
1468 }
1469
1470 static int acpi_nfit_init_mapping(struct acpi_nfit_desc *acpi_desc,
1471 struct nd_mapping *nd_mapping, struct nd_region_desc *ndr_desc,
1472 struct acpi_nfit_memory_map *memdev,
1473 struct acpi_nfit_system_address *spa)
1474 {
1475 struct nvdimm *nvdimm = acpi_nfit_dimm_by_handle(acpi_desc,
1476 memdev->device_handle);
1477 struct nd_blk_region_desc *ndbr_desc;
1478 struct nfit_mem *nfit_mem;
1479 int blk_valid = 0;
1480
1481 if (!nvdimm) {
1482 dev_err(acpi_desc->dev, "spa%d dimm: %#x not found\n",
1483 spa->range_index, memdev->device_handle);
1484 return -ENODEV;
1485 }
1486
1487 nd_mapping->nvdimm = nvdimm;
1488 switch (nfit_spa_type(spa)) {
1489 case NFIT_SPA_PM:
1490 case NFIT_SPA_VOLATILE:
1491 nd_mapping->start = memdev->address;
1492 nd_mapping->size = memdev->region_size;
1493 break;
1494 case NFIT_SPA_DCR:
1495 nfit_mem = nvdimm_provider_data(nvdimm);
1496 if (!nfit_mem || !nfit_mem->bdw) {
1497 dev_dbg(acpi_desc->dev, "spa%d %s missing bdw\n",
1498 spa->range_index, nvdimm_name(nvdimm));
1499 } else {
1500 nd_mapping->size = nfit_mem->bdw->capacity;
1501 nd_mapping->start = nfit_mem->bdw->start_address;
1502 ndr_desc->num_lanes = nfit_mem->bdw->windows;
1503 blk_valid = 1;
1504 }
1505
1506 ndr_desc->nd_mapping = nd_mapping;
1507 ndr_desc->num_mappings = blk_valid;
1508 ndbr_desc = to_blk_region_desc(ndr_desc);
1509 ndbr_desc->enable = acpi_nfit_blk_region_enable;
1510 ndbr_desc->disable = acpi_nfit_blk_region_disable;
1511 ndbr_desc->do_io = acpi_desc->blk_do_io;
1512 if (!nvdimm_blk_region_create(acpi_desc->nvdimm_bus, ndr_desc))
1513 return -ENOMEM;
1514 break;
1515 }
1516
1517 return 0;
1518 }
1519
1520 static int acpi_nfit_register_region(struct acpi_nfit_desc *acpi_desc,
1521 struct nfit_spa *nfit_spa)
1522 {
1523 static struct nd_mapping nd_mappings[ND_MAX_MAPPINGS];
1524 struct acpi_nfit_system_address *spa = nfit_spa->spa;
1525 struct nd_blk_region_desc ndbr_desc;
1526 struct nd_region_desc *ndr_desc;
1527 struct nfit_memdev *nfit_memdev;
1528 struct nvdimm_bus *nvdimm_bus;
1529 struct resource res;
1530 int count = 0, rc;
1531
1532 if (nfit_spa->is_registered)
1533 return 0;
1534
1535 if (spa->range_index == 0) {
1536 dev_dbg(acpi_desc->dev, "%s: detected invalid spa index\n",
1537 __func__);
1538 return 0;
1539 }
1540
1541 memset(&res, 0, sizeof(res));
1542 memset(&nd_mappings, 0, sizeof(nd_mappings));
1543 memset(&ndbr_desc, 0, sizeof(ndbr_desc));
1544 res.start = spa->address;
1545 res.end = res.start + spa->length - 1;
1546 ndr_desc = &ndbr_desc.ndr_desc;
1547 ndr_desc->res = &res;
1548 ndr_desc->provider_data = nfit_spa;
1549 ndr_desc->attr_groups = acpi_nfit_region_attribute_groups;
1550 if (spa->flags & ACPI_NFIT_PROXIMITY_VALID)
1551 ndr_desc->numa_node = acpi_map_pxm_to_online_node(
1552 spa->proximity_domain);
1553 else
1554 ndr_desc->numa_node = NUMA_NO_NODE;
1555
1556 list_for_each_entry(nfit_memdev, &acpi_desc->memdevs, list) {
1557 struct acpi_nfit_memory_map *memdev = nfit_memdev->memdev;
1558 struct nd_mapping *nd_mapping;
1559
1560 if (memdev->range_index != spa->range_index)
1561 continue;
1562 if (count >= ND_MAX_MAPPINGS) {
1563 dev_err(acpi_desc->dev, "spa%d exceeds max mappings %d\n",
1564 spa->range_index, ND_MAX_MAPPINGS);
1565 return -ENXIO;
1566 }
1567 nd_mapping = &nd_mappings[count++];
1568 rc = acpi_nfit_init_mapping(acpi_desc, nd_mapping, ndr_desc,
1569 memdev, spa);
1570 if (rc)
1571 return rc;
1572 }
1573
1574 ndr_desc->nd_mapping = nd_mappings;
1575 ndr_desc->num_mappings = count;
1576 rc = acpi_nfit_init_interleave_set(acpi_desc, ndr_desc, spa);
1577 if (rc)
1578 return rc;
1579
1580 nvdimm_bus = acpi_desc->nvdimm_bus;
1581 if (nfit_spa_type(spa) == NFIT_SPA_PM) {
1582 if (!nvdimm_pmem_region_create(nvdimm_bus, ndr_desc))
1583 return -ENOMEM;
1584 } else if (nfit_spa_type(spa) == NFIT_SPA_VOLATILE) {
1585 if (!nvdimm_volatile_region_create(nvdimm_bus, ndr_desc))
1586 return -ENOMEM;
1587 }
1588
1589 nfit_spa->is_registered = 1;
1590 return 0;
1591 }
1592
1593 static int acpi_nfit_register_regions(struct acpi_nfit_desc *acpi_desc)
1594 {
1595 struct nfit_spa *nfit_spa;
1596
1597 list_for_each_entry(nfit_spa, &acpi_desc->spas, list) {
1598 int rc = acpi_nfit_register_region(acpi_desc, nfit_spa);
1599
1600 if (rc)
1601 return rc;
1602 }
1603 return 0;
1604 }
1605
1606 static int acpi_nfit_check_deletions(struct acpi_nfit_desc *acpi_desc,
1607 struct nfit_table_prev *prev)
1608 {
1609 struct device *dev = acpi_desc->dev;
1610
1611 if (!list_empty(&prev->spas) ||
1612 !list_empty(&prev->memdevs) ||
1613 !list_empty(&prev->dcrs) ||
1614 !list_empty(&prev->bdws) ||
1615 !list_empty(&prev->idts) ||
1616 !list_empty(&prev->flushes)) {
1617 dev_err(dev, "new nfit deletes entries (unsupported)\n");
1618 return -ENXIO;
1619 }
1620 return 0;
1621 }
1622
1623 int acpi_nfit_init(struct acpi_nfit_desc *acpi_desc, acpi_size sz)
1624 {
1625 struct device *dev = acpi_desc->dev;
1626 struct nfit_table_prev prev;
1627 const void *end;
1628 u8 *data;
1629 int rc;
1630
1631 mutex_lock(&acpi_desc->init_mutex);
1632
1633 INIT_LIST_HEAD(&prev.spas);
1634 INIT_LIST_HEAD(&prev.memdevs);
1635 INIT_LIST_HEAD(&prev.dcrs);
1636 INIT_LIST_HEAD(&prev.bdws);
1637 INIT_LIST_HEAD(&prev.idts);
1638 INIT_LIST_HEAD(&prev.flushes);
1639
1640 list_cut_position(&prev.spas, &acpi_desc->spas,
1641 acpi_desc->spas.prev);
1642 list_cut_position(&prev.memdevs, &acpi_desc->memdevs,
1643 acpi_desc->memdevs.prev);
1644 list_cut_position(&prev.dcrs, &acpi_desc->dcrs,
1645 acpi_desc->dcrs.prev);
1646 list_cut_position(&prev.bdws, &acpi_desc->bdws,
1647 acpi_desc->bdws.prev);
1648 list_cut_position(&prev.idts, &acpi_desc->idts,
1649 acpi_desc->idts.prev);
1650 list_cut_position(&prev.flushes, &acpi_desc->flushes,
1651 acpi_desc->flushes.prev);
1652
1653 data = (u8 *) acpi_desc->nfit;
1654 end = data + sz;
1655 data += sizeof(struct acpi_table_nfit);
1656 while (!IS_ERR_OR_NULL(data))
1657 data = add_table(acpi_desc, &prev, data, end);
1658
1659 if (IS_ERR(data)) {
1660 dev_dbg(dev, "%s: nfit table parsing error: %ld\n", __func__,
1661 PTR_ERR(data));
1662 rc = PTR_ERR(data);
1663 goto out_unlock;
1664 }
1665
1666 rc = acpi_nfit_check_deletions(acpi_desc, &prev);
1667 if (rc)
1668 goto out_unlock;
1669
1670 if (nfit_mem_init(acpi_desc) != 0) {
1671 rc = -ENOMEM;
1672 goto out_unlock;
1673 }
1674
1675 acpi_nfit_init_dsms(acpi_desc);
1676
1677 rc = acpi_nfit_register_dimms(acpi_desc);
1678 if (rc)
1679 goto out_unlock;
1680
1681 rc = acpi_nfit_register_regions(acpi_desc);
1682
1683 out_unlock:
1684 mutex_unlock(&acpi_desc->init_mutex);
1685 return rc;
1686 }
1687 EXPORT_SYMBOL_GPL(acpi_nfit_init);
1688
1689 static struct acpi_nfit_desc *acpi_nfit_desc_init(struct acpi_device *adev)
1690 {
1691 struct nvdimm_bus_descriptor *nd_desc;
1692 struct acpi_nfit_desc *acpi_desc;
1693 struct device *dev = &adev->dev;
1694
1695 acpi_desc = devm_kzalloc(dev, sizeof(*acpi_desc), GFP_KERNEL);
1696 if (!acpi_desc)
1697 return ERR_PTR(-ENOMEM);
1698
1699 dev_set_drvdata(dev, acpi_desc);
1700 acpi_desc->dev = dev;
1701 acpi_desc->blk_do_io = acpi_nfit_blk_region_do_io;
1702 nd_desc = &acpi_desc->nd_desc;
1703 nd_desc->provider_name = "ACPI.NFIT";
1704 nd_desc->ndctl = acpi_nfit_ctl;
1705 nd_desc->attr_groups = acpi_nfit_attribute_groups;
1706
1707 acpi_desc->nvdimm_bus = nvdimm_bus_register(dev, nd_desc);
1708 if (!acpi_desc->nvdimm_bus) {
1709 devm_kfree(dev, acpi_desc);
1710 return ERR_PTR(-ENXIO);
1711 }
1712
1713 INIT_LIST_HEAD(&acpi_desc->spa_maps);
1714 INIT_LIST_HEAD(&acpi_desc->spas);
1715 INIT_LIST_HEAD(&acpi_desc->dcrs);
1716 INIT_LIST_HEAD(&acpi_desc->bdws);
1717 INIT_LIST_HEAD(&acpi_desc->idts);
1718 INIT_LIST_HEAD(&acpi_desc->flushes);
1719 INIT_LIST_HEAD(&acpi_desc->memdevs);
1720 INIT_LIST_HEAD(&acpi_desc->dimms);
1721 mutex_init(&acpi_desc->spa_map_mutex);
1722 mutex_init(&acpi_desc->init_mutex);
1723
1724 return acpi_desc;
1725 }
1726
1727 static int acpi_nfit_add(struct acpi_device *adev)
1728 {
1729 struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL };
1730 struct acpi_nfit_desc *acpi_desc;
1731 struct device *dev = &adev->dev;
1732 struct acpi_table_header *tbl;
1733 acpi_status status = AE_OK;
1734 acpi_size sz;
1735 int rc;
1736
1737 status = acpi_get_table_with_size("NFIT", 0, &tbl, &sz);
1738 if (ACPI_FAILURE(status)) {
1739 /* This is ok, we could have an nvdimm hotplugged later */
1740 dev_dbg(dev, "failed to find NFIT at startup\n");
1741 return 0;
1742 }
1743
1744 acpi_desc = acpi_nfit_desc_init(adev);
1745 if (IS_ERR(acpi_desc)) {
1746 dev_err(dev, "%s: error initializing acpi_desc: %ld\n",
1747 __func__, PTR_ERR(acpi_desc));
1748 return PTR_ERR(acpi_desc);
1749 }
1750
1751 acpi_desc->nfit = (struct acpi_table_nfit *) tbl;
1752
1753 /* Evaluate _FIT and override with that if present */
1754 status = acpi_evaluate_object(adev->handle, "_FIT", NULL, &buf);
1755 if (ACPI_SUCCESS(status) && buf.length > 0) {
1756 acpi_desc->nfit = (struct acpi_table_nfit *)buf.pointer;
1757 sz = buf.length;
1758 }
1759
1760 rc = acpi_nfit_init(acpi_desc, sz);
1761 if (rc) {
1762 nvdimm_bus_unregister(acpi_desc->nvdimm_bus);
1763 return rc;
1764 }
1765 return 0;
1766 }
1767
1768 static int acpi_nfit_remove(struct acpi_device *adev)
1769 {
1770 struct acpi_nfit_desc *acpi_desc = dev_get_drvdata(&adev->dev);
1771
1772 nvdimm_bus_unregister(acpi_desc->nvdimm_bus);
1773 return 0;
1774 }
1775
1776 static void acpi_nfit_notify(struct acpi_device *adev, u32 event)
1777 {
1778 struct acpi_nfit_desc *acpi_desc = dev_get_drvdata(&adev->dev);
1779 struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL };
1780 struct acpi_table_nfit *nfit_saved;
1781 struct device *dev = &adev->dev;
1782 acpi_status status;
1783 int ret;
1784
1785 dev_dbg(dev, "%s: event: %d\n", __func__, event);
1786
1787 device_lock(dev);
1788 if (!dev->driver) {
1789 /* dev->driver may be null if we're being removed */
1790 dev_dbg(dev, "%s: no driver found for dev\n", __func__);
1791 return;
1792 }
1793
1794 if (!acpi_desc) {
1795 acpi_desc = acpi_nfit_desc_init(adev);
1796 if (IS_ERR(acpi_desc)) {
1797 dev_err(dev, "%s: error initializing acpi_desc: %ld\n",
1798 __func__, PTR_ERR(acpi_desc));
1799 goto out_unlock;
1800 }
1801 }
1802
1803 /* Evaluate _FIT */
1804 status = acpi_evaluate_object(adev->handle, "_FIT", NULL, &buf);
1805 if (ACPI_FAILURE(status)) {
1806 dev_err(dev, "failed to evaluate _FIT\n");
1807 goto out_unlock;
1808 }
1809
1810 nfit_saved = acpi_desc->nfit;
1811 acpi_desc->nfit = (struct acpi_table_nfit *)buf.pointer;
1812 ret = acpi_nfit_init(acpi_desc, buf.length);
1813 if (!ret) {
1814 /* Merge failed, restore old nfit, and exit */
1815 acpi_desc->nfit = nfit_saved;
1816 dev_err(dev, "failed to merge updated NFIT\n");
1817 }
1818 kfree(buf.pointer);
1819
1820 out_unlock:
1821 device_unlock(dev);
1822 }
1823
1824 static const struct acpi_device_id acpi_nfit_ids[] = {
1825 { "ACPI0012", 0 },
1826 { "", 0 },
1827 };
1828 MODULE_DEVICE_TABLE(acpi, acpi_nfit_ids);
1829
1830 static struct acpi_driver acpi_nfit_driver = {
1831 .name = KBUILD_MODNAME,
1832 .ids = acpi_nfit_ids,
1833 .ops = {
1834 .add = acpi_nfit_add,
1835 .remove = acpi_nfit_remove,
1836 .notify = acpi_nfit_notify,
1837 },
1838 };
1839
1840 static __init int nfit_init(void)
1841 {
1842 BUILD_BUG_ON(sizeof(struct acpi_table_nfit) != 40);
1843 BUILD_BUG_ON(sizeof(struct acpi_nfit_system_address) != 56);
1844 BUILD_BUG_ON(sizeof(struct acpi_nfit_memory_map) != 48);
1845 BUILD_BUG_ON(sizeof(struct acpi_nfit_interleave) != 20);
1846 BUILD_BUG_ON(sizeof(struct acpi_nfit_smbios) != 9);
1847 BUILD_BUG_ON(sizeof(struct acpi_nfit_control_region) != 80);
1848 BUILD_BUG_ON(sizeof(struct acpi_nfit_data_region) != 40);
1849
1850 acpi_str_to_uuid(UUID_VOLATILE_MEMORY, nfit_uuid[NFIT_SPA_VOLATILE]);
1851 acpi_str_to_uuid(UUID_PERSISTENT_MEMORY, nfit_uuid[NFIT_SPA_PM]);
1852 acpi_str_to_uuid(UUID_CONTROL_REGION, nfit_uuid[NFIT_SPA_DCR]);
1853 acpi_str_to_uuid(UUID_DATA_REGION, nfit_uuid[NFIT_SPA_BDW]);
1854 acpi_str_to_uuid(UUID_VOLATILE_VIRTUAL_DISK, nfit_uuid[NFIT_SPA_VDISK]);
1855 acpi_str_to_uuid(UUID_VOLATILE_VIRTUAL_CD, nfit_uuid[NFIT_SPA_VCD]);
1856 acpi_str_to_uuid(UUID_PERSISTENT_VIRTUAL_DISK, nfit_uuid[NFIT_SPA_PDISK]);
1857 acpi_str_to_uuid(UUID_PERSISTENT_VIRTUAL_CD, nfit_uuid[NFIT_SPA_PCD]);
1858 acpi_str_to_uuid(UUID_NFIT_BUS, nfit_uuid[NFIT_DEV_BUS]);
1859 acpi_str_to_uuid(UUID_NFIT_DIMM, nfit_uuid[NFIT_DEV_DIMM]);
1860
1861 return acpi_bus_register_driver(&acpi_nfit_driver);
1862 }
1863
1864 static __exit void nfit_exit(void)
1865 {
1866 acpi_bus_unregister_driver(&acpi_nfit_driver);
1867 }
1868
1869 module_init(nfit_init);
1870 module_exit(nfit_exit);
1871 MODULE_LICENSE("GPL v2");
1872 MODULE_AUTHOR("Intel Corporation");
Linux kernel - Deliverables
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