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irqchip/s3c24xx: Mark init_eint as __maybe_unused
[linux/fpc-iii.git] / drivers / acpi / nfit.c
blobaa45d480270721280a9e8085574a14d086a079fc
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 size_t length = min_t(size_t, sizeof(*spa), spa->header.length);
237 struct device *dev = acpi_desc->dev;
238 struct nfit_spa *nfit_spa;
239
240 list_for_each_entry(nfit_spa, &prev->spas, list) {
241 if (memcmp(nfit_spa->spa, spa, length) == 0) {
242 list_move_tail(&nfit_spa->list, &acpi_desc->spas);
243 return true;
244 }
245 }
246
247 nfit_spa = devm_kzalloc(dev, sizeof(*nfit_spa), GFP_KERNEL);
248 if (!nfit_spa)
249 return false;
250 INIT_LIST_HEAD(&nfit_spa->list);
251 nfit_spa->spa = spa;
252 list_add_tail(&nfit_spa->list, &acpi_desc->spas);
253 dev_dbg(dev, "%s: spa index: %d type: %s\n", __func__,
254 spa->range_index,
255 spa_type_name(nfit_spa_type(spa)));
256 return true;
257 }
258
259 static bool add_memdev(struct acpi_nfit_desc *acpi_desc,
260 struct nfit_table_prev *prev,
261 struct acpi_nfit_memory_map *memdev)
262 {
263 size_t length = min_t(size_t, sizeof(*memdev), memdev->header.length);
264 struct device *dev = acpi_desc->dev;
265 struct nfit_memdev *nfit_memdev;
266
267 list_for_each_entry(nfit_memdev, &prev->memdevs, list)
268 if (memcmp(nfit_memdev->memdev, memdev, length) == 0) {
269 list_move_tail(&nfit_memdev->list, &acpi_desc->memdevs);
270 return true;
271 }
272
273 nfit_memdev = devm_kzalloc(dev, sizeof(*nfit_memdev), GFP_KERNEL);
274 if (!nfit_memdev)
275 return false;
276 INIT_LIST_HEAD(&nfit_memdev->list);
277 nfit_memdev->memdev = memdev;
278 list_add_tail(&nfit_memdev->list, &acpi_desc->memdevs);
279 dev_dbg(dev, "%s: memdev handle: %#x spa: %d dcr: %d\n",
280 __func__, memdev->device_handle, memdev->range_index,
281 memdev->region_index);
282 return true;
283 }
284
285 static bool add_dcr(struct acpi_nfit_desc *acpi_desc,
286 struct nfit_table_prev *prev,
287 struct acpi_nfit_control_region *dcr)
288 {
289 size_t length = min_t(size_t, sizeof(*dcr), dcr->header.length);
290 struct device *dev = acpi_desc->dev;
291 struct nfit_dcr *nfit_dcr;
292
293 list_for_each_entry(nfit_dcr, &prev->dcrs, list)
294 if (memcmp(nfit_dcr->dcr, dcr, length) == 0) {
295 list_move_tail(&nfit_dcr->list, &acpi_desc->dcrs);
296 return true;
297 }
298
299 nfit_dcr = devm_kzalloc(dev, sizeof(*nfit_dcr), GFP_KERNEL);
300 if (!nfit_dcr)
301 return false;
302 INIT_LIST_HEAD(&nfit_dcr->list);
303 nfit_dcr->dcr = dcr;
304 list_add_tail(&nfit_dcr->list, &acpi_desc->dcrs);
305 dev_dbg(dev, "%s: dcr index: %d windows: %d\n", __func__,
306 dcr->region_index, dcr->windows);
307 return true;
308 }
309
310 static bool add_bdw(struct acpi_nfit_desc *acpi_desc,
311 struct nfit_table_prev *prev,
312 struct acpi_nfit_data_region *bdw)
313 {
314 size_t length = min_t(size_t, sizeof(*bdw), bdw->header.length);
315 struct device *dev = acpi_desc->dev;
316 struct nfit_bdw *nfit_bdw;
317
318 list_for_each_entry(nfit_bdw, &prev->bdws, list)
319 if (memcmp(nfit_bdw->bdw, bdw, length) == 0) {
320 list_move_tail(&nfit_bdw->list, &acpi_desc->bdws);
321 return true;
322 }
323
324 nfit_bdw = devm_kzalloc(dev, sizeof(*nfit_bdw), GFP_KERNEL);
325 if (!nfit_bdw)
326 return false;
327 INIT_LIST_HEAD(&nfit_bdw->list);
328 nfit_bdw->bdw = bdw;
329 list_add_tail(&nfit_bdw->list, &acpi_desc->bdws);
330 dev_dbg(dev, "%s: bdw dcr: %d windows: %d\n", __func__,
331 bdw->region_index, bdw->windows);
332 return true;
333 }
334
335 static bool add_idt(struct acpi_nfit_desc *acpi_desc,
336 struct nfit_table_prev *prev,
337 struct acpi_nfit_interleave *idt)
338 {
339 size_t length = min_t(size_t, sizeof(*idt), idt->header.length);
340 struct device *dev = acpi_desc->dev;
341 struct nfit_idt *nfit_idt;
342
343 list_for_each_entry(nfit_idt, &prev->idts, list)
344 if (memcmp(nfit_idt->idt, idt, length) == 0) {
345 list_move_tail(&nfit_idt->list, &acpi_desc->idts);
346 return true;
347 }
348
349 nfit_idt = devm_kzalloc(dev, sizeof(*nfit_idt), GFP_KERNEL);
350 if (!nfit_idt)
351 return false;
352 INIT_LIST_HEAD(&nfit_idt->list);
353 nfit_idt->idt = idt;
354 list_add_tail(&nfit_idt->list, &acpi_desc->idts);
355 dev_dbg(dev, "%s: idt index: %d num_lines: %d\n", __func__,
356 idt->interleave_index, idt->line_count);
357 return true;
358 }
359
360 static bool add_flush(struct acpi_nfit_desc *acpi_desc,
361 struct nfit_table_prev *prev,
362 struct acpi_nfit_flush_address *flush)
363 {
364 size_t length = min_t(size_t, sizeof(*flush), flush->header.length);
365 struct device *dev = acpi_desc->dev;
366 struct nfit_flush *nfit_flush;
367
368 list_for_each_entry(nfit_flush, &prev->flushes, list)
369 if (memcmp(nfit_flush->flush, flush, length) == 0) {
370 list_move_tail(&nfit_flush->list, &acpi_desc->flushes);
371 return true;
372 }
373
374 nfit_flush = devm_kzalloc(dev, sizeof(*nfit_flush), GFP_KERNEL);
375 if (!nfit_flush)
376 return false;
377 INIT_LIST_HEAD(&nfit_flush->list);
378 nfit_flush->flush = flush;
379 list_add_tail(&nfit_flush->list, &acpi_desc->flushes);
380 dev_dbg(dev, "%s: nfit_flush handle: %d hint_count: %d\n", __func__,
381 flush->device_handle, flush->hint_count);
382 return true;
383 }
384
385 static void *add_table(struct acpi_nfit_desc *acpi_desc,
386 struct nfit_table_prev *prev, void *table, const void *end)
387 {
388 struct device *dev = acpi_desc->dev;
389 struct acpi_nfit_header *hdr;
390 void *err = ERR_PTR(-ENOMEM);
391
392 if (table >= end)
393 return NULL;
394
395 hdr = table;
396 if (!hdr->length) {
397 dev_warn(dev, "found a zero length table '%d' parsing nfit\n",
398 hdr->type);
399 return NULL;
400 }
401
402 switch (hdr->type) {
403 case ACPI_NFIT_TYPE_SYSTEM_ADDRESS:
404 if (!add_spa(acpi_desc, prev, table))
405 return err;
406 break;
407 case ACPI_NFIT_TYPE_MEMORY_MAP:
408 if (!add_memdev(acpi_desc, prev, table))
409 return err;
410 break;
411 case ACPI_NFIT_TYPE_CONTROL_REGION:
412 if (!add_dcr(acpi_desc, prev, table))
413 return err;
414 break;
415 case ACPI_NFIT_TYPE_DATA_REGION:
416 if (!add_bdw(acpi_desc, prev, table))
417 return err;
418 break;
419 case ACPI_NFIT_TYPE_INTERLEAVE:
420 if (!add_idt(acpi_desc, prev, table))
421 return err;
422 break;
423 case ACPI_NFIT_TYPE_FLUSH_ADDRESS:
424 if (!add_flush(acpi_desc, prev, table))
425 return err;
426 break;
427 case ACPI_NFIT_TYPE_SMBIOS:
428 dev_dbg(dev, "%s: smbios\n", __func__);
429 break;
430 default:
431 dev_err(dev, "unknown table '%d' parsing nfit\n", hdr->type);
432 break;
433 }
434
435 return table + hdr->length;
436 }
437
438 static void nfit_mem_find_spa_bdw(struct acpi_nfit_desc *acpi_desc,
439 struct nfit_mem *nfit_mem)
440 {
441 u32 device_handle = __to_nfit_memdev(nfit_mem)->device_handle;
442 u16 dcr = nfit_mem->dcr->region_index;
443 struct nfit_spa *nfit_spa;
444
445 list_for_each_entry(nfit_spa, &acpi_desc->spas, list) {
446 u16 range_index = nfit_spa->spa->range_index;
447 int type = nfit_spa_type(nfit_spa->spa);
448 struct nfit_memdev *nfit_memdev;
449
450 if (type != NFIT_SPA_BDW)
451 continue;
452
453 list_for_each_entry(nfit_memdev, &acpi_desc->memdevs, list) {
454 if (nfit_memdev->memdev->range_index != range_index)
455 continue;
456 if (nfit_memdev->memdev->device_handle != device_handle)
457 continue;
458 if (nfit_memdev->memdev->region_index != dcr)
459 continue;
460
461 nfit_mem->spa_bdw = nfit_spa->spa;
462 return;
463 }
464 }
465
466 dev_dbg(acpi_desc->dev, "SPA-BDW not found for SPA-DCR %d\n",
467 nfit_mem->spa_dcr->range_index);
468 nfit_mem->bdw = NULL;
469 }
470
471 static int nfit_mem_add(struct acpi_nfit_desc *acpi_desc,
472 struct nfit_mem *nfit_mem, struct acpi_nfit_system_address *spa)
473 {
474 u16 dcr = __to_nfit_memdev(nfit_mem)->region_index;
475 struct nfit_memdev *nfit_memdev;
476 struct nfit_flush *nfit_flush;
477 struct nfit_dcr *nfit_dcr;
478 struct nfit_bdw *nfit_bdw;
479 struct nfit_idt *nfit_idt;
480 u16 idt_idx, range_index;
481
482 list_for_each_entry(nfit_dcr, &acpi_desc->dcrs, list) {
483 if (nfit_dcr->dcr->region_index != dcr)
484 continue;
485 nfit_mem->dcr = nfit_dcr->dcr;
486 break;
487 }
488
489 if (!nfit_mem->dcr) {
490 dev_dbg(acpi_desc->dev, "SPA %d missing:%s%s\n",
491 spa->range_index, __to_nfit_memdev(nfit_mem)
492 ? "" : " MEMDEV", nfit_mem->dcr ? "" : " DCR");
493 return -ENODEV;
494 }
495
496 /*
497 * We've found enough to create an nvdimm, optionally
498 * find an associated BDW
499 */
500 list_add(&nfit_mem->list, &acpi_desc->dimms);
501
502 list_for_each_entry(nfit_bdw, &acpi_desc->bdws, list) {
503 if (nfit_bdw->bdw->region_index != dcr)
504 continue;
505 nfit_mem->bdw = nfit_bdw->bdw;
506 break;
507 }
508
509 if (!nfit_mem->bdw)
510 return 0;
511
512 nfit_mem_find_spa_bdw(acpi_desc, nfit_mem);
513
514 if (!nfit_mem->spa_bdw)
515 return 0;
516
517 range_index = nfit_mem->spa_bdw->range_index;
518 list_for_each_entry(nfit_memdev, &acpi_desc->memdevs, list) {
519 if (nfit_memdev->memdev->range_index != range_index ||
520 nfit_memdev->memdev->region_index != dcr)
521 continue;
522 nfit_mem->memdev_bdw = nfit_memdev->memdev;
523 idt_idx = nfit_memdev->memdev->interleave_index;
524 list_for_each_entry(nfit_idt, &acpi_desc->idts, list) {
525 if (nfit_idt->idt->interleave_index != idt_idx)
526 continue;
527 nfit_mem->idt_bdw = nfit_idt->idt;
528 break;
529 }
530
531 list_for_each_entry(nfit_flush, &acpi_desc->flushes, list) {
532 if (nfit_flush->flush->device_handle !=
533 nfit_memdev->memdev->device_handle)
534 continue;
535 nfit_mem->nfit_flush = nfit_flush;
536 break;
537 }
538 break;
539 }
540
541 return 0;
542 }
543
544 static int nfit_mem_dcr_init(struct acpi_nfit_desc *acpi_desc,
545 struct acpi_nfit_system_address *spa)
546 {
547 struct nfit_mem *nfit_mem, *found;
548 struct nfit_memdev *nfit_memdev;
549 int type = nfit_spa_type(spa);
550 u16 dcr;
551
552 switch (type) {
553 case NFIT_SPA_DCR:
554 case NFIT_SPA_PM:
555 break;
556 default:
557 return 0;
558 }
559
560 list_for_each_entry(nfit_memdev, &acpi_desc->memdevs, list) {
561 int rc;
562
563 if (nfit_memdev->memdev->range_index != spa->range_index)
564 continue;
565 found = NULL;
566 dcr = nfit_memdev->memdev->region_index;
567 list_for_each_entry(nfit_mem, &acpi_desc->dimms, list)
568 if (__to_nfit_memdev(nfit_mem)->region_index == dcr) {
569 found = nfit_mem;
570 break;
571 }
572
573 if (found)
574 nfit_mem = found;
575 else {
576 nfit_mem = devm_kzalloc(acpi_desc->dev,
577 sizeof(*nfit_mem), GFP_KERNEL);
578 if (!nfit_mem)
579 return -ENOMEM;
580 INIT_LIST_HEAD(&nfit_mem->list);
581 }
582
583 if (type == NFIT_SPA_DCR) {
584 struct nfit_idt *nfit_idt;
585 u16 idt_idx;
586
587 /* multiple dimms may share a SPA when interleaved */
588 nfit_mem->spa_dcr = spa;
589 nfit_mem->memdev_dcr = nfit_memdev->memdev;
590 idt_idx = nfit_memdev->memdev->interleave_index;
591 list_for_each_entry(nfit_idt, &acpi_desc->idts, list) {
592 if (nfit_idt->idt->interleave_index != idt_idx)
593 continue;
594 nfit_mem->idt_dcr = nfit_idt->idt;
595 break;
596 }
597 } else {
598 /*
599 * A single dimm may belong to multiple SPA-PM
600 * ranges, record at least one in addition to
601 * any SPA-DCR range.
602 */
603 nfit_mem->memdev_pmem = nfit_memdev->memdev;
604 }
605
606 if (found)
607 continue;
608
609 rc = nfit_mem_add(acpi_desc, nfit_mem, spa);
610 if (rc)
611 return rc;
612 }
613
614 return 0;
615 }
616
617 static int nfit_mem_cmp(void *priv, struct list_head *_a, struct list_head *_b)
618 {
619 struct nfit_mem *a = container_of(_a, typeof(*a), list);
620 struct nfit_mem *b = container_of(_b, typeof(*b), list);
621 u32 handleA, handleB;
622
623 handleA = __to_nfit_memdev(a)->device_handle;
624 handleB = __to_nfit_memdev(b)->device_handle;
625 if (handleA < handleB)
626 return -1;
627 else if (handleA > handleB)
628 return 1;
629 return 0;
630 }
631
632 static int nfit_mem_init(struct acpi_nfit_desc *acpi_desc)
633 {
634 struct nfit_spa *nfit_spa;
635
636 /*
637 * For each SPA-DCR or SPA-PMEM address range find its
638 * corresponding MEMDEV(s). From each MEMDEV find the
639 * corresponding DCR. Then, if we're operating on a SPA-DCR,
640 * try to find a SPA-BDW and a corresponding BDW that references
641 * the DCR. Throw it all into an nfit_mem object. Note, that
642 * BDWs are optional.
643 */
644 list_for_each_entry(nfit_spa, &acpi_desc->spas, list) {
645 int rc;
646
647 rc = nfit_mem_dcr_init(acpi_desc, nfit_spa->spa);
648 if (rc)
649 return rc;
650 }
651
652 list_sort(NULL, &acpi_desc->dimms, nfit_mem_cmp);
653
654 return 0;
655 }
656
657 static ssize_t revision_show(struct device *dev,
658 struct device_attribute *attr, char *buf)
659 {
660 struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev);
661 struct nvdimm_bus_descriptor *nd_desc = to_nd_desc(nvdimm_bus);
662 struct acpi_nfit_desc *acpi_desc = to_acpi_desc(nd_desc);
663
664 return sprintf(buf, "%d\n", acpi_desc->acpi_header.revision);
665 }
666 static DEVICE_ATTR_RO(revision);
667
668 static struct attribute *acpi_nfit_attributes[] = {
669 &dev_attr_revision.attr,
670 NULL,
671 };
672
673 static struct attribute_group acpi_nfit_attribute_group = {
674 .name = "nfit",
675 .attrs = acpi_nfit_attributes,
676 };
677
678 const struct attribute_group *acpi_nfit_attribute_groups[] = {
679 &nvdimm_bus_attribute_group,
680 &acpi_nfit_attribute_group,
681 NULL,
682 };
683 EXPORT_SYMBOL_GPL(acpi_nfit_attribute_groups);
684
685 static struct acpi_nfit_memory_map *to_nfit_memdev(struct device *dev)
686 {
687 struct nvdimm *nvdimm = to_nvdimm(dev);
688 struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
689
690 return __to_nfit_memdev(nfit_mem);
691 }
692
693 static struct acpi_nfit_control_region *to_nfit_dcr(struct device *dev)
694 {
695 struct nvdimm *nvdimm = to_nvdimm(dev);
696 struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
697
698 return nfit_mem->dcr;
699 }
700
701 static ssize_t handle_show(struct device *dev,
702 struct device_attribute *attr, char *buf)
703 {
704 struct acpi_nfit_memory_map *memdev = to_nfit_memdev(dev);
705
706 return sprintf(buf, "%#x\n", memdev->device_handle);
707 }
708 static DEVICE_ATTR_RO(handle);
709
710 static ssize_t phys_id_show(struct device *dev,
711 struct device_attribute *attr, char *buf)
712 {
713 struct acpi_nfit_memory_map *memdev = to_nfit_memdev(dev);
714
715 return sprintf(buf, "%#x\n", memdev->physical_id);
716 }
717 static DEVICE_ATTR_RO(phys_id);
718
719 static ssize_t vendor_show(struct device *dev,
720 struct device_attribute *attr, char *buf)
721 {
722 struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev);
723
724 return sprintf(buf, "%#x\n", dcr->vendor_id);
725 }
726 static DEVICE_ATTR_RO(vendor);
727
728 static ssize_t rev_id_show(struct device *dev,
729 struct device_attribute *attr, char *buf)
730 {
731 struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev);
732
733 return sprintf(buf, "%#x\n", dcr->revision_id);
734 }
735 static DEVICE_ATTR_RO(rev_id);
736
737 static ssize_t device_show(struct device *dev,
738 struct device_attribute *attr, char *buf)
739 {
740 struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev);
741
742 return sprintf(buf, "%#x\n", dcr->device_id);
743 }
744 static DEVICE_ATTR_RO(device);
745
746 static ssize_t format_show(struct device *dev,
747 struct device_attribute *attr, char *buf)
748 {
749 struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev);
750
751 return sprintf(buf, "%#x\n", dcr->code);
752 }
753 static DEVICE_ATTR_RO(format);
754
755 static ssize_t serial_show(struct device *dev,
756 struct device_attribute *attr, char *buf)
757 {
758 struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev);
759
760 return sprintf(buf, "%#x\n", dcr->serial_number);
761 }
762 static DEVICE_ATTR_RO(serial);
763
764 static ssize_t flags_show(struct device *dev,
765 struct device_attribute *attr, char *buf)
766 {
767 u16 flags = to_nfit_memdev(dev)->flags;
768
769 return sprintf(buf, "%s%s%s%s%s\n",
770 flags & ACPI_NFIT_MEM_SAVE_FAILED ? "save_fail " : "",
771 flags & ACPI_NFIT_MEM_RESTORE_FAILED ? "restore_fail " : "",
772 flags & ACPI_NFIT_MEM_FLUSH_FAILED ? "flush_fail " : "",
773 flags & ACPI_NFIT_MEM_NOT_ARMED ? "not_armed " : "",
774 flags & ACPI_NFIT_MEM_HEALTH_OBSERVED ? "smart_event " : "");
775 }
776 static DEVICE_ATTR_RO(flags);
777
778 static struct attribute *acpi_nfit_dimm_attributes[] = {
779 &dev_attr_handle.attr,
780 &dev_attr_phys_id.attr,
781 &dev_attr_vendor.attr,
782 &dev_attr_device.attr,
783 &dev_attr_format.attr,
784 &dev_attr_serial.attr,
785 &dev_attr_rev_id.attr,
786 &dev_attr_flags.attr,
787 NULL,
788 };
789
790 static umode_t acpi_nfit_dimm_attr_visible(struct kobject *kobj,
791 struct attribute *a, int n)
792 {
793 struct device *dev = container_of(kobj, struct device, kobj);
794
795 if (to_nfit_dcr(dev))
796 return a->mode;
797 else
798 return 0;
799 }
800
801 static struct attribute_group acpi_nfit_dimm_attribute_group = {
802 .name = "nfit",
803 .attrs = acpi_nfit_dimm_attributes,
804 .is_visible = acpi_nfit_dimm_attr_visible,
805 };
806
807 static const struct attribute_group *acpi_nfit_dimm_attribute_groups[] = {
808 &nvdimm_attribute_group,
809 &nd_device_attribute_group,
810 &acpi_nfit_dimm_attribute_group,
811 NULL,
812 };
813
814 static struct nvdimm *acpi_nfit_dimm_by_handle(struct acpi_nfit_desc *acpi_desc,
815 u32 device_handle)
816 {
817 struct nfit_mem *nfit_mem;
818
819 list_for_each_entry(nfit_mem, &acpi_desc->dimms, list)
820 if (__to_nfit_memdev(nfit_mem)->device_handle == device_handle)
821 return nfit_mem->nvdimm;
822
823 return NULL;
824 }
825
826 static int acpi_nfit_add_dimm(struct acpi_nfit_desc *acpi_desc,
827 struct nfit_mem *nfit_mem, u32 device_handle)
828 {
829 struct acpi_device *adev, *adev_dimm;
830 struct device *dev = acpi_desc->dev;
831 const u8 *uuid = to_nfit_uuid(NFIT_DEV_DIMM);
832 int i;
833
834 nfit_mem->dsm_mask = acpi_desc->dimm_dsm_force_en;
835 adev = to_acpi_dev(acpi_desc);
836 if (!adev)
837 return 0;
838
839 adev_dimm = acpi_find_child_device(adev, device_handle, false);
840 nfit_mem->adev = adev_dimm;
841 if (!adev_dimm) {
842 dev_err(dev, "no ACPI.NFIT device with _ADR %#x, disabling...\n",
843 device_handle);
844 return force_enable_dimms ? 0 : -ENODEV;
845 }
846
847 for (i = ND_CMD_SMART; i <= ND_CMD_VENDOR; i++)
848 if (acpi_check_dsm(adev_dimm->handle, uuid, 1, 1ULL << i))
849 set_bit(i, &nfit_mem->dsm_mask);
850
851 return 0;
852 }
853
854 static int acpi_nfit_register_dimms(struct acpi_nfit_desc *acpi_desc)
855 {
856 struct nfit_mem *nfit_mem;
857 int dimm_count = 0;
858
859 list_for_each_entry(nfit_mem, &acpi_desc->dimms, list) {
860 struct nvdimm *nvdimm;
861 unsigned long flags = 0;
862 u32 device_handle;
863 u16 mem_flags;
864 int rc;
865
866 device_handle = __to_nfit_memdev(nfit_mem)->device_handle;
867 nvdimm = acpi_nfit_dimm_by_handle(acpi_desc, device_handle);
868 if (nvdimm) {
869 dimm_count++;
870 continue;
871 }
872
873 if (nfit_mem->bdw && nfit_mem->memdev_pmem)
874 flags |= NDD_ALIASING;
875
876 mem_flags = __to_nfit_memdev(nfit_mem)->flags;
877 if (mem_flags & ACPI_NFIT_MEM_NOT_ARMED)
878 flags |= NDD_UNARMED;
879
880 rc = acpi_nfit_add_dimm(acpi_desc, nfit_mem, device_handle);
881 if (rc)
882 continue;
883
884 nvdimm = nvdimm_create(acpi_desc->nvdimm_bus, nfit_mem,
885 acpi_nfit_dimm_attribute_groups,
886 flags, &nfit_mem->dsm_mask);
887 if (!nvdimm)
888 return -ENOMEM;
889
890 nfit_mem->nvdimm = nvdimm;
891 dimm_count++;
892
893 if ((mem_flags & ACPI_NFIT_MEM_FAILED_MASK) == 0)
894 continue;
895
896 dev_info(acpi_desc->dev, "%s flags:%s%s%s%s\n",
897 nvdimm_name(nvdimm),
898 mem_flags & ACPI_NFIT_MEM_SAVE_FAILED ? " save_fail" : "",
899 mem_flags & ACPI_NFIT_MEM_RESTORE_FAILED ? " restore_fail":"",
900 mem_flags & ACPI_NFIT_MEM_FLUSH_FAILED ? " flush_fail" : "",
901 mem_flags & ACPI_NFIT_MEM_NOT_ARMED ? " not_armed" : "");
902
903 }
904
905 return nvdimm_bus_check_dimm_count(acpi_desc->nvdimm_bus, dimm_count);
906 }
907
908 static void acpi_nfit_init_dsms(struct acpi_nfit_desc *acpi_desc)
909 {
910 struct nvdimm_bus_descriptor *nd_desc = &acpi_desc->nd_desc;
911 const u8 *uuid = to_nfit_uuid(NFIT_DEV_BUS);
912 struct acpi_device *adev;
913 int i;
914
915 nd_desc->dsm_mask = acpi_desc->bus_dsm_force_en;
916 adev = to_acpi_dev(acpi_desc);
917 if (!adev)
918 return;
919
920 for (i = ND_CMD_ARS_CAP; i <= ND_CMD_ARS_STATUS; i++)
921 if (acpi_check_dsm(adev->handle, uuid, 1, 1ULL << i))
922 set_bit(i, &nd_desc->dsm_mask);
923 }
924
925 static ssize_t range_index_show(struct device *dev,
926 struct device_attribute *attr, char *buf)
927 {
928 struct nd_region *nd_region = to_nd_region(dev);
929 struct nfit_spa *nfit_spa = nd_region_provider_data(nd_region);
930
931 return sprintf(buf, "%d\n", nfit_spa->spa->range_index);
932 }
933 static DEVICE_ATTR_RO(range_index);
934
935 static struct attribute *acpi_nfit_region_attributes[] = {
936 &dev_attr_range_index.attr,
937 NULL,
938 };
939
940 static struct attribute_group acpi_nfit_region_attribute_group = {
941 .name = "nfit",
942 .attrs = acpi_nfit_region_attributes,
943 };
944
945 static const struct attribute_group *acpi_nfit_region_attribute_groups[] = {
946 &nd_region_attribute_group,
947 &nd_mapping_attribute_group,
948 &nd_device_attribute_group,
949 &nd_numa_attribute_group,
950 &acpi_nfit_region_attribute_group,
951 NULL,
952 };
953
954 /* enough info to uniquely specify an interleave set */
955 struct nfit_set_info {
956 struct nfit_set_info_map {
957 u64 region_offset;
958 u32 serial_number;
959 u32 pad;
960 } mapping[0];
961 };
962
963 static size_t sizeof_nfit_set_info(int num_mappings)
964 {
965 return sizeof(struct nfit_set_info)
966 + num_mappings * sizeof(struct nfit_set_info_map);
967 }
968
969 static int cmp_map(const void *m0, const void *m1)
970 {
971 const struct nfit_set_info_map *map0 = m0;
972 const struct nfit_set_info_map *map1 = m1;
973
974 return memcmp(&map0->region_offset, &map1->region_offset,
975 sizeof(u64));
976 }
977
978 /* Retrieve the nth entry referencing this spa */
979 static struct acpi_nfit_memory_map *memdev_from_spa(
980 struct acpi_nfit_desc *acpi_desc, u16 range_index, int n)
981 {
982 struct nfit_memdev *nfit_memdev;
983
984 list_for_each_entry(nfit_memdev, &acpi_desc->memdevs, list)
985 if (nfit_memdev->memdev->range_index == range_index)
986 if (n-- == 0)
987 return nfit_memdev->memdev;
988 return NULL;
989 }
990
991 static int acpi_nfit_init_interleave_set(struct acpi_nfit_desc *acpi_desc,
992 struct nd_region_desc *ndr_desc,
993 struct acpi_nfit_system_address *spa)
994 {
995 int i, spa_type = nfit_spa_type(spa);
996 struct device *dev = acpi_desc->dev;
997 struct nd_interleave_set *nd_set;
998 u16 nr = ndr_desc->num_mappings;
999 struct nfit_set_info *info;
1000
1001 if (spa_type == NFIT_SPA_PM || spa_type == NFIT_SPA_VOLATILE)
1002 /* pass */;
1003 else
1004 return 0;
1005
1006 nd_set = devm_kzalloc(dev, sizeof(*nd_set), GFP_KERNEL);
1007 if (!nd_set)
1008 return -ENOMEM;
1009
1010 info = devm_kzalloc(dev, sizeof_nfit_set_info(nr), GFP_KERNEL);
1011 if (!info)
1012 return -ENOMEM;
1013 for (i = 0; i < nr; i++) {
1014 struct nd_mapping *nd_mapping = &ndr_desc->nd_mapping[i];
1015 struct nfit_set_info_map *map = &info->mapping[i];
1016 struct nvdimm *nvdimm = nd_mapping->nvdimm;
1017 struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
1018 struct acpi_nfit_memory_map *memdev = memdev_from_spa(acpi_desc,
1019 spa->range_index, i);
1020
1021 if (!memdev || !nfit_mem->dcr) {
1022 dev_err(dev, "%s: failed to find DCR\n", __func__);
1023 return -ENODEV;
1024 }
1025
1026 map->region_offset = memdev->region_offset;
1027 map->serial_number = nfit_mem->dcr->serial_number;
1028 }
1029
1030 sort(&info->mapping[0], nr, sizeof(struct nfit_set_info_map),
1031 cmp_map, NULL);
1032 nd_set->cookie = nd_fletcher64(info, sizeof_nfit_set_info(nr), 0);
1033 ndr_desc->nd_set = nd_set;
1034 devm_kfree(dev, info);
1035
1036 return 0;
1037 }
1038
1039 static u64 to_interleave_offset(u64 offset, struct nfit_blk_mmio *mmio)
1040 {
1041 struct acpi_nfit_interleave *idt = mmio->idt;
1042 u32 sub_line_offset, line_index, line_offset;
1043 u64 line_no, table_skip_count, table_offset;
1044
1045 line_no = div_u64_rem(offset, mmio->line_size, &sub_line_offset);
1046 table_skip_count = div_u64_rem(line_no, mmio->num_lines, &line_index);
1047 line_offset = idt->line_offset[line_index]
1048 * mmio->line_size;
1049 table_offset = table_skip_count * mmio->table_size;
1050
1051 return mmio->base_offset + line_offset + table_offset + sub_line_offset;
1052 }
1053
1054 static void wmb_blk(struct nfit_blk *nfit_blk)
1055 {
1056
1057 if (nfit_blk->nvdimm_flush) {
1058 /*
1059 * The first wmb() is needed to 'sfence' all previous writes
1060 * such that they are architecturally visible for the platform
1061 * buffer flush. Note that we've already arranged for pmem
1062 * writes to avoid the cache via arch_memcpy_to_pmem(). The
1063 * final wmb() ensures ordering for the NVDIMM flush write.
1064 */
1065 wmb();
1066 writeq(1, nfit_blk->nvdimm_flush);
1067 wmb();
1068 } else
1069 wmb_pmem();
1070 }
1071
1072 static u32 read_blk_stat(struct nfit_blk *nfit_blk, unsigned int bw)
1073 {
1074 struct nfit_blk_mmio *mmio = &nfit_blk->mmio[DCR];
1075 u64 offset = nfit_blk->stat_offset + mmio->size * bw;
1076
1077 if (mmio->num_lines)
1078 offset = to_interleave_offset(offset, mmio);
1079
1080 return readl(mmio->addr.base + offset);
1081 }
1082
1083 static void write_blk_ctl(struct nfit_blk *nfit_blk, unsigned int bw,
1084 resource_size_t dpa, unsigned int len, unsigned int write)
1085 {
1086 u64 cmd, offset;
1087 struct nfit_blk_mmio *mmio = &nfit_blk->mmio[DCR];
1088
1089 enum {
1090 BCW_OFFSET_MASK = (1ULL << 48)-1,
1091 BCW_LEN_SHIFT = 48,
1092 BCW_LEN_MASK = (1ULL << 8) - 1,
1093 BCW_CMD_SHIFT = 56,
1094 };
1095
1096 cmd = (dpa >> L1_CACHE_SHIFT) & BCW_OFFSET_MASK;
1097 len = len >> L1_CACHE_SHIFT;
1098 cmd |= ((u64) len & BCW_LEN_MASK) << BCW_LEN_SHIFT;
1099 cmd |= ((u64) write) << BCW_CMD_SHIFT;
1100
1101 offset = nfit_blk->cmd_offset + mmio->size * bw;
1102 if (mmio->num_lines)
1103 offset = to_interleave_offset(offset, mmio);
1104
1105 writeq(cmd, mmio->addr.base + offset);
1106 wmb_blk(nfit_blk);
1107
1108 if (nfit_blk->dimm_flags & ND_BLK_DCR_LATCH)
1109 readq(mmio->addr.base + offset);
1110 }
1111
1112 static int acpi_nfit_blk_single_io(struct nfit_blk *nfit_blk,
1113 resource_size_t dpa, void *iobuf, size_t len, int rw,
1114 unsigned int lane)
1115 {
1116 struct nfit_blk_mmio *mmio = &nfit_blk->mmio[BDW];
1117 unsigned int copied = 0;
1118 u64 base_offset;
1119 int rc;
1120
1121 base_offset = nfit_blk->bdw_offset + dpa % L1_CACHE_BYTES
1122 + lane * mmio->size;
1123 write_blk_ctl(nfit_blk, lane, dpa, len, rw);
1124 while (len) {
1125 unsigned int c;
1126 u64 offset;
1127
1128 if (mmio->num_lines) {
1129 u32 line_offset;
1130
1131 offset = to_interleave_offset(base_offset + copied,
1132 mmio);
1133 div_u64_rem(offset, mmio->line_size, &line_offset);
1134 c = min_t(size_t, len, mmio->line_size - line_offset);
1135 } else {
1136 offset = base_offset + nfit_blk->bdw_offset;
1137 c = len;
1138 }
1139
1140 if (rw)
1141 memcpy_to_pmem(mmio->addr.aperture + offset,
1142 iobuf + copied, c);
1143 else {
1144 if (nfit_blk->dimm_flags & ND_BLK_READ_FLUSH)
1145 mmio_flush_range((void __force *)
1146 mmio->addr.aperture + offset, c);
1147
1148 memcpy_from_pmem(iobuf + copied,
1149 mmio->addr.aperture + offset, c);
1150 }
1151
1152 copied += c;
1153 len -= c;
1154 }
1155
1156 if (rw)
1157 wmb_blk(nfit_blk);
1158
1159 rc = read_blk_stat(nfit_blk, lane) ? -EIO : 0;
1160 return rc;
1161 }
1162
1163 static int acpi_nfit_blk_region_do_io(struct nd_blk_region *ndbr,
1164 resource_size_t dpa, void *iobuf, u64 len, int rw)
1165 {
1166 struct nfit_blk *nfit_blk = nd_blk_region_provider_data(ndbr);
1167 struct nfit_blk_mmio *mmio = &nfit_blk->mmio[BDW];
1168 struct nd_region *nd_region = nfit_blk->nd_region;
1169 unsigned int lane, copied = 0;
1170 int rc = 0;
1171
1172 lane = nd_region_acquire_lane(nd_region);
1173 while (len) {
1174 u64 c = min(len, mmio->size);
1175
1176 rc = acpi_nfit_blk_single_io(nfit_blk, dpa + copied,
1177 iobuf + copied, c, rw, lane);
1178 if (rc)
1179 break;
1180
1181 copied += c;
1182 len -= c;
1183 }
1184 nd_region_release_lane(nd_region, lane);
1185
1186 return rc;
1187 }
1188
1189 static void nfit_spa_mapping_release(struct kref *kref)
1190 {
1191 struct nfit_spa_mapping *spa_map = to_spa_map(kref);
1192 struct acpi_nfit_system_address *spa = spa_map->spa;
1193 struct acpi_nfit_desc *acpi_desc = spa_map->acpi_desc;
1194
1195 WARN_ON(!mutex_is_locked(&acpi_desc->spa_map_mutex));
1196 dev_dbg(acpi_desc->dev, "%s: SPA%d\n", __func__, spa->range_index);
1197 if (spa_map->type == SPA_MAP_APERTURE)
1198 memunmap((void __force *)spa_map->addr.aperture);
1199 else
1200 iounmap(spa_map->addr.base);
1201 release_mem_region(spa->address, spa->length);
1202 list_del(&spa_map->list);
1203 kfree(spa_map);
1204 }
1205
1206 static struct nfit_spa_mapping *find_spa_mapping(
1207 struct acpi_nfit_desc *acpi_desc,
1208 struct acpi_nfit_system_address *spa)
1209 {
1210 struct nfit_spa_mapping *spa_map;
1211
1212 WARN_ON(!mutex_is_locked(&acpi_desc->spa_map_mutex));
1213 list_for_each_entry(spa_map, &acpi_desc->spa_maps, list)
1214 if (spa_map->spa == spa)
1215 return spa_map;
1216
1217 return NULL;
1218 }
1219
1220 static void nfit_spa_unmap(struct acpi_nfit_desc *acpi_desc,
1221 struct acpi_nfit_system_address *spa)
1222 {
1223 struct nfit_spa_mapping *spa_map;
1224
1225 mutex_lock(&acpi_desc->spa_map_mutex);
1226 spa_map = find_spa_mapping(acpi_desc, spa);
1227
1228 if (spa_map)
1229 kref_put(&spa_map->kref, nfit_spa_mapping_release);
1230 mutex_unlock(&acpi_desc->spa_map_mutex);
1231 }
1232
1233 static void __iomem *__nfit_spa_map(struct acpi_nfit_desc *acpi_desc,
1234 struct acpi_nfit_system_address *spa, enum spa_map_type type)
1235 {
1236 resource_size_t start = spa->address;
1237 resource_size_t n = spa->length;
1238 struct nfit_spa_mapping *spa_map;
1239 struct resource *res;
1240
1241 WARN_ON(!mutex_is_locked(&acpi_desc->spa_map_mutex));
1242
1243 spa_map = find_spa_mapping(acpi_desc, spa);
1244 if (spa_map) {
1245 kref_get(&spa_map->kref);
1246 return spa_map->addr.base;
1247 }
1248
1249 spa_map = kzalloc(sizeof(*spa_map), GFP_KERNEL);
1250 if (!spa_map)
1251 return NULL;
1252
1253 INIT_LIST_HEAD(&spa_map->list);
1254 spa_map->spa = spa;
1255 kref_init(&spa_map->kref);
1256 spa_map->acpi_desc = acpi_desc;
1257
1258 res = request_mem_region(start, n, dev_name(acpi_desc->dev));
1259 if (!res)
1260 goto err_mem;
1261
1262 spa_map->type = type;
1263 if (type == SPA_MAP_APERTURE)
1264 spa_map->addr.aperture = (void __pmem *)memremap(start, n,
1265 ARCH_MEMREMAP_PMEM);
1266 else
1267 spa_map->addr.base = ioremap_nocache(start, n);
1268
1269
1270 if (!spa_map->addr.base)
1271 goto err_map;
1272
1273 list_add_tail(&spa_map->list, &acpi_desc->spa_maps);
1274 return spa_map->addr.base;
1275
1276 err_map:
1277 release_mem_region(start, n);
1278 err_mem:
1279 kfree(spa_map);
1280 return NULL;
1281 }
1282
1283 /**
1284 * nfit_spa_map - interleave-aware managed-mappings of acpi_nfit_system_address ranges
1285 * @nvdimm_bus: NFIT-bus that provided the spa table entry
1286 * @nfit_spa: spa table to map
1287 * @type: aperture or control region
1288 *
1289 * In the case where block-data-window apertures and
1290 * dimm-control-regions are interleaved they will end up sharing a
1291 * single request_mem_region() + ioremap() for the address range. In
1292 * the style of devm nfit_spa_map() mappings are automatically dropped
1293 * when all region devices referencing the same mapping are disabled /
1294 * unbound.
1295 */
1296 static void __iomem *nfit_spa_map(struct acpi_nfit_desc *acpi_desc,
1297 struct acpi_nfit_system_address *spa, enum spa_map_type type)
1298 {
1299 void __iomem *iomem;
1300
1301 mutex_lock(&acpi_desc->spa_map_mutex);
1302 iomem = __nfit_spa_map(acpi_desc, spa, type);
1303 mutex_unlock(&acpi_desc->spa_map_mutex);
1304
1305 return iomem;
1306 }
1307
1308 static int nfit_blk_init_interleave(struct nfit_blk_mmio *mmio,
1309 struct acpi_nfit_interleave *idt, u16 interleave_ways)
1310 {
1311 if (idt) {
1312 mmio->num_lines = idt->line_count;
1313 mmio->line_size = idt->line_size;
1314 if (interleave_ways == 0)
1315 return -ENXIO;
1316 mmio->table_size = mmio->num_lines * interleave_ways
1317 * mmio->line_size;
1318 }
1319
1320 return 0;
1321 }
1322
1323 static int acpi_nfit_blk_get_flags(struct nvdimm_bus_descriptor *nd_desc,
1324 struct nvdimm *nvdimm, struct nfit_blk *nfit_blk)
1325 {
1326 struct nd_cmd_dimm_flags flags;
1327 int rc;
1328
1329 memset(&flags, 0, sizeof(flags));
1330 rc = nd_desc->ndctl(nd_desc, nvdimm, ND_CMD_DIMM_FLAGS, &flags,
1331 sizeof(flags));
1332
1333 if (rc >= 0 && flags.status == 0)
1334 nfit_blk->dimm_flags = flags.flags;
1335 else if (rc == -ENOTTY) {
1336 /* fall back to a conservative default */
1337 nfit_blk->dimm_flags = ND_BLK_DCR_LATCH | ND_BLK_READ_FLUSH;
1338 rc = 0;
1339 } else
1340 rc = -ENXIO;
1341
1342 return rc;
1343 }
1344
1345 static int acpi_nfit_blk_region_enable(struct nvdimm_bus *nvdimm_bus,
1346 struct device *dev)
1347 {
1348 struct nvdimm_bus_descriptor *nd_desc = to_nd_desc(nvdimm_bus);
1349 struct acpi_nfit_desc *acpi_desc = to_acpi_desc(nd_desc);
1350 struct nd_blk_region *ndbr = to_nd_blk_region(dev);
1351 struct nfit_flush *nfit_flush;
1352 struct nfit_blk_mmio *mmio;
1353 struct nfit_blk *nfit_blk;
1354 struct nfit_mem *nfit_mem;
1355 struct nvdimm *nvdimm;
1356 int rc;
1357
1358 nvdimm = nd_blk_region_to_dimm(ndbr);
1359 nfit_mem = nvdimm_provider_data(nvdimm);
1360 if (!nfit_mem || !nfit_mem->dcr || !nfit_mem->bdw) {
1361 dev_dbg(dev, "%s: missing%s%s%s\n", __func__,
1362 nfit_mem ? "" : " nfit_mem",
1363 (nfit_mem && nfit_mem->dcr) ? "" : " dcr",
1364 (nfit_mem && nfit_mem->bdw) ? "" : " bdw");
1365 return -ENXIO;
1366 }
1367
1368 nfit_blk = devm_kzalloc(dev, sizeof(*nfit_blk), GFP_KERNEL);
1369 if (!nfit_blk)
1370 return -ENOMEM;
1371 nd_blk_region_set_provider_data(ndbr, nfit_blk);
1372 nfit_blk->nd_region = to_nd_region(dev);
1373
1374 /* map block aperture memory */
1375 nfit_blk->bdw_offset = nfit_mem->bdw->offset;
1376 mmio = &nfit_blk->mmio[BDW];
1377 mmio->addr.base = nfit_spa_map(acpi_desc, nfit_mem->spa_bdw,
1378 SPA_MAP_APERTURE);
1379 if (!mmio->addr.base) {
1380 dev_dbg(dev, "%s: %s failed to map bdw\n", __func__,
1381 nvdimm_name(nvdimm));
1382 return -ENOMEM;
1383 }
1384 mmio->size = nfit_mem->bdw->size;
1385 mmio->base_offset = nfit_mem->memdev_bdw->region_offset;
1386 mmio->idt = nfit_mem->idt_bdw;
1387 mmio->spa = nfit_mem->spa_bdw;
1388 rc = nfit_blk_init_interleave(mmio, nfit_mem->idt_bdw,
1389 nfit_mem->memdev_bdw->interleave_ways);
1390 if (rc) {
1391 dev_dbg(dev, "%s: %s failed to init bdw interleave\n",
1392 __func__, nvdimm_name(nvdimm));
1393 return rc;
1394 }
1395
1396 /* map block control memory */
1397 nfit_blk->cmd_offset = nfit_mem->dcr->command_offset;
1398 nfit_blk->stat_offset = nfit_mem->dcr->status_offset;
1399 mmio = &nfit_blk->mmio[DCR];
1400 mmio->addr.base = nfit_spa_map(acpi_desc, nfit_mem->spa_dcr,
1401 SPA_MAP_CONTROL);
1402 if (!mmio->addr.base) {
1403 dev_dbg(dev, "%s: %s failed to map dcr\n", __func__,
1404 nvdimm_name(nvdimm));
1405 return -ENOMEM;
1406 }
1407 mmio->size = nfit_mem->dcr->window_size;
1408 mmio->base_offset = nfit_mem->memdev_dcr->region_offset;
1409 mmio->idt = nfit_mem->idt_dcr;
1410 mmio->spa = nfit_mem->spa_dcr;
1411 rc = nfit_blk_init_interleave(mmio, nfit_mem->idt_dcr,
1412 nfit_mem->memdev_dcr->interleave_ways);
1413 if (rc) {
1414 dev_dbg(dev, "%s: %s failed to init dcr interleave\n",
1415 __func__, nvdimm_name(nvdimm));
1416 return rc;
1417 }
1418
1419 rc = acpi_nfit_blk_get_flags(nd_desc, nvdimm, nfit_blk);
1420 if (rc < 0) {
1421 dev_dbg(dev, "%s: %s failed get DIMM flags\n",
1422 __func__, nvdimm_name(nvdimm));
1423 return rc;
1424 }
1425
1426 nfit_flush = nfit_mem->nfit_flush;
1427 if (nfit_flush && nfit_flush->flush->hint_count != 0) {
1428 nfit_blk->nvdimm_flush = devm_ioremap_nocache(dev,
1429 nfit_flush->flush->hint_address[0], 8);
1430 if (!nfit_blk->nvdimm_flush)
1431 return -ENOMEM;
1432 }
1433
1434 if (!arch_has_wmb_pmem() && !nfit_blk->nvdimm_flush)
1435 dev_warn(dev, "unable to guarantee persistence of writes\n");
1436
1437 if (mmio->line_size == 0)
1438 return 0;
1439
1440 if ((u32) nfit_blk->cmd_offset % mmio->line_size
1441 + 8 > mmio->line_size) {
1442 dev_dbg(dev, "cmd_offset crosses interleave boundary\n");
1443 return -ENXIO;
1444 } else if ((u32) nfit_blk->stat_offset % mmio->line_size
1445 + 8 > mmio->line_size) {
1446 dev_dbg(dev, "stat_offset crosses interleave boundary\n");
1447 return -ENXIO;
1448 }
1449
1450 return 0;
1451 }
1452
1453 static void acpi_nfit_blk_region_disable(struct nvdimm_bus *nvdimm_bus,
1454 struct device *dev)
1455 {
1456 struct nvdimm_bus_descriptor *nd_desc = to_nd_desc(nvdimm_bus);
1457 struct acpi_nfit_desc *acpi_desc = to_acpi_desc(nd_desc);
1458 struct nd_blk_region *ndbr = to_nd_blk_region(dev);
1459 struct nfit_blk *nfit_blk = nd_blk_region_provider_data(ndbr);
1460 int i;
1461
1462 if (!nfit_blk)
1463 return; /* never enabled */
1464
1465 /* auto-free BLK spa mappings */
1466 for (i = 0; i < 2; i++) {
1467 struct nfit_blk_mmio *mmio = &nfit_blk->mmio[i];
1468
1469 if (mmio->addr.base)
1470 nfit_spa_unmap(acpi_desc, mmio->spa);
1471 }
1472 nd_blk_region_set_provider_data(ndbr, NULL);
1473 /* devm will free nfit_blk */
1474 }
1475
1476 static int acpi_nfit_init_mapping(struct acpi_nfit_desc *acpi_desc,
1477 struct nd_mapping *nd_mapping, struct nd_region_desc *ndr_desc,
1478 struct acpi_nfit_memory_map *memdev,
1479 struct acpi_nfit_system_address *spa)
1480 {
1481 struct nvdimm *nvdimm = acpi_nfit_dimm_by_handle(acpi_desc,
1482 memdev->device_handle);
1483 struct nd_blk_region_desc *ndbr_desc;
1484 struct nfit_mem *nfit_mem;
1485 int blk_valid = 0;
1486
1487 if (!nvdimm) {
1488 dev_err(acpi_desc->dev, "spa%d dimm: %#x not found\n",
1489 spa->range_index, memdev->device_handle);
1490 return -ENODEV;
1491 }
1492
1493 nd_mapping->nvdimm = nvdimm;
1494 switch (nfit_spa_type(spa)) {
1495 case NFIT_SPA_PM:
1496 case NFIT_SPA_VOLATILE:
1497 nd_mapping->start = memdev->address;
1498 nd_mapping->size = memdev->region_size;
1499 break;
1500 case NFIT_SPA_DCR:
1501 nfit_mem = nvdimm_provider_data(nvdimm);
1502 if (!nfit_mem || !nfit_mem->bdw) {
1503 dev_dbg(acpi_desc->dev, "spa%d %s missing bdw\n",
1504 spa->range_index, nvdimm_name(nvdimm));
1505 } else {
1506 nd_mapping->size = nfit_mem->bdw->capacity;
1507 nd_mapping->start = nfit_mem->bdw->start_address;
1508 ndr_desc->num_lanes = nfit_mem->bdw->windows;
1509 blk_valid = 1;
1510 }
1511
1512 ndr_desc->nd_mapping = nd_mapping;
1513 ndr_desc->num_mappings = blk_valid;
1514 ndbr_desc = to_blk_region_desc(ndr_desc);
1515 ndbr_desc->enable = acpi_nfit_blk_region_enable;
1516 ndbr_desc->disable = acpi_nfit_blk_region_disable;
1517 ndbr_desc->do_io = acpi_desc->blk_do_io;
1518 if (!nvdimm_blk_region_create(acpi_desc->nvdimm_bus, ndr_desc))
1519 return -ENOMEM;
1520 break;
1521 }
1522
1523 return 0;
1524 }
1525
1526 static int acpi_nfit_register_region(struct acpi_nfit_desc *acpi_desc,
1527 struct nfit_spa *nfit_spa)
1528 {
1529 static struct nd_mapping nd_mappings[ND_MAX_MAPPINGS];
1530 struct acpi_nfit_system_address *spa = nfit_spa->spa;
1531 struct nd_blk_region_desc ndbr_desc;
1532 struct nd_region_desc *ndr_desc;
1533 struct nfit_memdev *nfit_memdev;
1534 struct nvdimm_bus *nvdimm_bus;
1535 struct resource res;
1536 int count = 0, rc;
1537
1538 if (nfit_spa->is_registered)
1539 return 0;
1540
1541 if (spa->range_index == 0) {
1542 dev_dbg(acpi_desc->dev, "%s: detected invalid spa index\n",
1543 __func__);
1544 return 0;
1545 }
1546
1547 memset(&res, 0, sizeof(res));
1548 memset(&nd_mappings, 0, sizeof(nd_mappings));
1549 memset(&ndbr_desc, 0, sizeof(ndbr_desc));
1550 res.start = spa->address;
1551 res.end = res.start + spa->length - 1;
1552 ndr_desc = &ndbr_desc.ndr_desc;
1553 ndr_desc->res = &res;
1554 ndr_desc->provider_data = nfit_spa;
1555 ndr_desc->attr_groups = acpi_nfit_region_attribute_groups;
1556 if (spa->flags & ACPI_NFIT_PROXIMITY_VALID)
1557 ndr_desc->numa_node = acpi_map_pxm_to_online_node(
1558 spa->proximity_domain);
1559 else
1560 ndr_desc->numa_node = NUMA_NO_NODE;
1561
1562 list_for_each_entry(nfit_memdev, &acpi_desc->memdevs, list) {
1563 struct acpi_nfit_memory_map *memdev = nfit_memdev->memdev;
1564 struct nd_mapping *nd_mapping;
1565
1566 if (memdev->range_index != spa->range_index)
1567 continue;
1568 if (count >= ND_MAX_MAPPINGS) {
1569 dev_err(acpi_desc->dev, "spa%d exceeds max mappings %d\n",
1570 spa->range_index, ND_MAX_MAPPINGS);
1571 return -ENXIO;
1572 }
1573 nd_mapping = &nd_mappings[count++];
1574 rc = acpi_nfit_init_mapping(acpi_desc, nd_mapping, ndr_desc,
1575 memdev, spa);
1576 if (rc)
1577 return rc;
1578 }
1579
1580 ndr_desc->nd_mapping = nd_mappings;
1581 ndr_desc->num_mappings = count;
1582 rc = acpi_nfit_init_interleave_set(acpi_desc, ndr_desc, spa);
1583 if (rc)
1584 return rc;
1585
1586 nvdimm_bus = acpi_desc->nvdimm_bus;
1587 if (nfit_spa_type(spa) == NFIT_SPA_PM) {
1588 if (!nvdimm_pmem_region_create(nvdimm_bus, ndr_desc))
1589 return -ENOMEM;
1590 } else if (nfit_spa_type(spa) == NFIT_SPA_VOLATILE) {
1591 if (!nvdimm_volatile_region_create(nvdimm_bus, ndr_desc))
1592 return -ENOMEM;
1593 }
1594
1595 nfit_spa->is_registered = 1;
1596 return 0;
1597 }
1598
1599 static int acpi_nfit_register_regions(struct acpi_nfit_desc *acpi_desc)
1600 {
1601 struct nfit_spa *nfit_spa;
1602
1603 list_for_each_entry(nfit_spa, &acpi_desc->spas, list) {
1604 int rc = acpi_nfit_register_region(acpi_desc, nfit_spa);
1605
1606 if (rc)
1607 return rc;
1608 }
1609 return 0;
1610 }
1611
1612 static int acpi_nfit_check_deletions(struct acpi_nfit_desc *acpi_desc,
1613 struct nfit_table_prev *prev)
1614 {
1615 struct device *dev = acpi_desc->dev;
1616
1617 if (!list_empty(&prev->spas) ||
1618 !list_empty(&prev->memdevs) ||
1619 !list_empty(&prev->dcrs) ||
1620 !list_empty(&prev->bdws) ||
1621 !list_empty(&prev->idts) ||
1622 !list_empty(&prev->flushes)) {
1623 dev_err(dev, "new nfit deletes entries (unsupported)\n");
1624 return -ENXIO;
1625 }
1626 return 0;
1627 }
1628
1629 int acpi_nfit_init(struct acpi_nfit_desc *acpi_desc, acpi_size sz)
1630 {
1631 struct device *dev = acpi_desc->dev;
1632 struct nfit_table_prev prev;
1633 const void *end;
1634 u8 *data;
1635 int rc;
1636
1637 mutex_lock(&acpi_desc->init_mutex);
1638
1639 INIT_LIST_HEAD(&prev.spas);
1640 INIT_LIST_HEAD(&prev.memdevs);
1641 INIT_LIST_HEAD(&prev.dcrs);
1642 INIT_LIST_HEAD(&prev.bdws);
1643 INIT_LIST_HEAD(&prev.idts);
1644 INIT_LIST_HEAD(&prev.flushes);
1645
1646 list_cut_position(&prev.spas, &acpi_desc->spas,
1647 acpi_desc->spas.prev);
1648 list_cut_position(&prev.memdevs, &acpi_desc->memdevs,
1649 acpi_desc->memdevs.prev);
1650 list_cut_position(&prev.dcrs, &acpi_desc->dcrs,
1651 acpi_desc->dcrs.prev);
1652 list_cut_position(&prev.bdws, &acpi_desc->bdws,
1653 acpi_desc->bdws.prev);
1654 list_cut_position(&prev.idts, &acpi_desc->idts,
1655 acpi_desc->idts.prev);
1656 list_cut_position(&prev.flushes, &acpi_desc->flushes,
1657 acpi_desc->flushes.prev);
1658
1659 data = (u8 *) acpi_desc->nfit;
1660 end = data + sz;
1661 while (!IS_ERR_OR_NULL(data))
1662 data = add_table(acpi_desc, &prev, data, end);
1663
1664 if (IS_ERR(data)) {
1665 dev_dbg(dev, "%s: nfit table parsing error: %ld\n", __func__,
1666 PTR_ERR(data));
1667 rc = PTR_ERR(data);
1668 goto out_unlock;
1669 }
1670
1671 rc = acpi_nfit_check_deletions(acpi_desc, &prev);
1672 if (rc)
1673 goto out_unlock;
1674
1675 if (nfit_mem_init(acpi_desc) != 0) {
1676 rc = -ENOMEM;
1677 goto out_unlock;
1678 }
1679
1680 acpi_nfit_init_dsms(acpi_desc);
1681
1682 rc = acpi_nfit_register_dimms(acpi_desc);
1683 if (rc)
1684 goto out_unlock;
1685
1686 rc = acpi_nfit_register_regions(acpi_desc);
1687
1688 out_unlock:
1689 mutex_unlock(&acpi_desc->init_mutex);
1690 return rc;
1691 }
1692 EXPORT_SYMBOL_GPL(acpi_nfit_init);
1693
1694 static struct acpi_nfit_desc *acpi_nfit_desc_init(struct acpi_device *adev)
1695 {
1696 struct nvdimm_bus_descriptor *nd_desc;
1697 struct acpi_nfit_desc *acpi_desc;
1698 struct device *dev = &adev->dev;
1699
1700 acpi_desc = devm_kzalloc(dev, sizeof(*acpi_desc), GFP_KERNEL);
1701 if (!acpi_desc)
1702 return ERR_PTR(-ENOMEM);
1703
1704 dev_set_drvdata(dev, acpi_desc);
1705 acpi_desc->dev = dev;
1706 acpi_desc->blk_do_io = acpi_nfit_blk_region_do_io;
1707 nd_desc = &acpi_desc->nd_desc;
1708 nd_desc->provider_name = "ACPI.NFIT";
1709 nd_desc->ndctl = acpi_nfit_ctl;
1710 nd_desc->attr_groups = acpi_nfit_attribute_groups;
1711
1712 acpi_desc->nvdimm_bus = nvdimm_bus_register(dev, nd_desc);
1713 if (!acpi_desc->nvdimm_bus) {
1714 devm_kfree(dev, acpi_desc);
1715 return ERR_PTR(-ENXIO);
1716 }
1717
1718 INIT_LIST_HEAD(&acpi_desc->spa_maps);
1719 INIT_LIST_HEAD(&acpi_desc->spas);
1720 INIT_LIST_HEAD(&acpi_desc->dcrs);
1721 INIT_LIST_HEAD(&acpi_desc->bdws);
1722 INIT_LIST_HEAD(&acpi_desc->idts);
1723 INIT_LIST_HEAD(&acpi_desc->flushes);
1724 INIT_LIST_HEAD(&acpi_desc->memdevs);
1725 INIT_LIST_HEAD(&acpi_desc->dimms);
1726 mutex_init(&acpi_desc->spa_map_mutex);
1727 mutex_init(&acpi_desc->init_mutex);
1728
1729 return acpi_desc;
1730 }
1731
1732 static int acpi_nfit_add(struct acpi_device *adev)
1733 {
1734 struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL };
1735 struct acpi_nfit_desc *acpi_desc;
1736 struct device *dev = &adev->dev;
1737 struct acpi_table_header *tbl;
1738 acpi_status status = AE_OK;
1739 acpi_size sz;
1740 int rc;
1741
1742 status = acpi_get_table_with_size("NFIT", 0, &tbl, &sz);
1743 if (ACPI_FAILURE(status)) {
1744 /* This is ok, we could have an nvdimm hotplugged later */
1745 dev_dbg(dev, "failed to find NFIT at startup\n");
1746 return 0;
1747 }
1748
1749 acpi_desc = acpi_nfit_desc_init(adev);
1750 if (IS_ERR(acpi_desc)) {
1751 dev_err(dev, "%s: error initializing acpi_desc: %ld\n",
1752 __func__, PTR_ERR(acpi_desc));
1753 return PTR_ERR(acpi_desc);
1754 }
1755
1756 /*
1757 * Save the acpi header for later and then skip it,
1758 * making nfit point to the first nfit table header.
1759 */
1760 acpi_desc->acpi_header = *tbl;
1761 acpi_desc->nfit = (void *) tbl + sizeof(struct acpi_table_nfit);
1762 sz -= sizeof(struct acpi_table_nfit);
1763
1764 /* Evaluate _FIT and override with that if present */
1765 status = acpi_evaluate_object(adev->handle, "_FIT", NULL, &buf);
1766 if (ACPI_SUCCESS(status) && buf.length > 0) {
1767 union acpi_object *obj;
1768 /*
1769 * Adjust for the acpi_object header of the _FIT
1770 */
1771 obj = buf.pointer;
1772 if (obj->type == ACPI_TYPE_BUFFER) {
1773 acpi_desc->nfit =
1774 (struct acpi_nfit_header *)obj->buffer.pointer;
1775 sz = obj->buffer.length;
1776 } else
1777 dev_dbg(dev, "%s invalid type %d, ignoring _FIT\n",
1778 __func__, (int) obj->type);
1779 }
1780
1781 rc = acpi_nfit_init(acpi_desc, sz);
1782 if (rc) {
1783 nvdimm_bus_unregister(acpi_desc->nvdimm_bus);
1784 return rc;
1785 }
1786 return 0;
1787 }
1788
1789 static int acpi_nfit_remove(struct acpi_device *adev)
1790 {
1791 struct acpi_nfit_desc *acpi_desc = dev_get_drvdata(&adev->dev);
1792
1793 nvdimm_bus_unregister(acpi_desc->nvdimm_bus);
1794 return 0;
1795 }
1796
1797 static void acpi_nfit_notify(struct acpi_device *adev, u32 event)
1798 {
1799 struct acpi_nfit_desc *acpi_desc = dev_get_drvdata(&adev->dev);
1800 struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL };
1801 struct acpi_nfit_header *nfit_saved;
1802 union acpi_object *obj;
1803 struct device *dev = &adev->dev;
1804 acpi_status status;
1805 int ret;
1806
1807 dev_dbg(dev, "%s: event: %d\n", __func__, event);
1808
1809 device_lock(dev);
1810 if (!dev->driver) {
1811 /* dev->driver may be null if we're being removed */
1812 dev_dbg(dev, "%s: no driver found for dev\n", __func__);
1813 goto out_unlock;
1814 }
1815
1816 if (!acpi_desc) {
1817 acpi_desc = acpi_nfit_desc_init(adev);
1818 if (IS_ERR(acpi_desc)) {
1819 dev_err(dev, "%s: error initializing acpi_desc: %ld\n",
1820 __func__, PTR_ERR(acpi_desc));
1821 goto out_unlock;
1822 }
1823 }
1824
1825 /* Evaluate _FIT */
1826 status = acpi_evaluate_object(adev->handle, "_FIT", NULL, &buf);
1827 if (ACPI_FAILURE(status)) {
1828 dev_err(dev, "failed to evaluate _FIT\n");
1829 goto out_unlock;
1830 }
1831
1832 nfit_saved = acpi_desc->nfit;
1833 obj = buf.pointer;
1834 if (obj->type == ACPI_TYPE_BUFFER) {
1835 acpi_desc->nfit =
1836 (struct acpi_nfit_header *)obj->buffer.pointer;
1837 ret = acpi_nfit_init(acpi_desc, obj->buffer.length);
1838 if (ret) {
1839 /* Merge failed, restore old nfit, and exit */
1840 acpi_desc->nfit = nfit_saved;
1841 dev_err(dev, "failed to merge updated NFIT\n");
1842 }
1843 } else {
1844 /* Bad _FIT, restore old nfit */
1845 dev_err(dev, "Invalid _FIT\n");
1846 }
1847 kfree(buf.pointer);
1848
1849 out_unlock:
1850 device_unlock(dev);
1851 }
1852
1853 static const struct acpi_device_id acpi_nfit_ids[] = {
1854 { "ACPI0012", 0 },
1855 { "", 0 },
1856 };
1857 MODULE_DEVICE_TABLE(acpi, acpi_nfit_ids);
1858
1859 static struct acpi_driver acpi_nfit_driver = {
1860 .name = KBUILD_MODNAME,
1861 .ids = acpi_nfit_ids,
1862 .ops = {
1863 .add = acpi_nfit_add,
1864 .remove = acpi_nfit_remove,
1865 .notify = acpi_nfit_notify,
1866 },
1867 };
1868
1869 static __init int nfit_init(void)
1870 {
1871 BUILD_BUG_ON(sizeof(struct acpi_table_nfit) != 40);
1872 BUILD_BUG_ON(sizeof(struct acpi_nfit_system_address) != 56);
1873 BUILD_BUG_ON(sizeof(struct acpi_nfit_memory_map) != 48);
1874 BUILD_BUG_ON(sizeof(struct acpi_nfit_interleave) != 20);
1875 BUILD_BUG_ON(sizeof(struct acpi_nfit_smbios) != 9);
1876 BUILD_BUG_ON(sizeof(struct acpi_nfit_control_region) != 80);
1877 BUILD_BUG_ON(sizeof(struct acpi_nfit_data_region) != 40);
1878
1879 acpi_str_to_uuid(UUID_VOLATILE_MEMORY, nfit_uuid[NFIT_SPA_VOLATILE]);
1880 acpi_str_to_uuid(UUID_PERSISTENT_MEMORY, nfit_uuid[NFIT_SPA_PM]);
1881 acpi_str_to_uuid(UUID_CONTROL_REGION, nfit_uuid[NFIT_SPA_DCR]);
1882 acpi_str_to_uuid(UUID_DATA_REGION, nfit_uuid[NFIT_SPA_BDW]);
1883 acpi_str_to_uuid(UUID_VOLATILE_VIRTUAL_DISK, nfit_uuid[NFIT_SPA_VDISK]);
1884 acpi_str_to_uuid(UUID_VOLATILE_VIRTUAL_CD, nfit_uuid[NFIT_SPA_VCD]);
1885 acpi_str_to_uuid(UUID_PERSISTENT_VIRTUAL_DISK, nfit_uuid[NFIT_SPA_PDISK]);
1886 acpi_str_to_uuid(UUID_PERSISTENT_VIRTUAL_CD, nfit_uuid[NFIT_SPA_PCD]);
1887 acpi_str_to_uuid(UUID_NFIT_BUS, nfit_uuid[NFIT_DEV_BUS]);
1888 acpi_str_to_uuid(UUID_NFIT_DIMM, nfit_uuid[NFIT_DEV_DIMM]);
1889
1890 return acpi_bus_register_driver(&acpi_nfit_driver);
1891 }
1892
1893 static __exit void nfit_exit(void)
1894 {
1895 acpi_bus_unregister_driver(&acpi_nfit_driver);
1896 }
1897
1898 module_init(nfit_init);
1899 module_exit(nfit_exit);
1900 MODULE_LICENSE("GPL v2");
1901 MODULE_AUTHOR("Intel Corporation");
Linux with added FPC-III support