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ppp: release rtnl mutex when interface creation fails
[mirror_ubuntu-zesty-kernel.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/delay.h>
19 #include <linux/list.h>
20 #include <linux/acpi.h>
21 #include <linux/sort.h>
22 #include <linux/pmem.h>
23 #include <linux/io.h>
24 #include <asm/cacheflush.h>
25 #include "nfit.h"
26
27 /*
28 * For readq() and writeq() on 32-bit builds, the hi-lo, lo-hi order is
29 * irrelevant.
30 */
31 #include <linux/io-64-nonatomic-hi-lo.h>
32
33 static bool force_enable_dimms;
34 module_param(force_enable_dimms, bool, S_IRUGO|S_IWUSR);
35 MODULE_PARM_DESC(force_enable_dimms, "Ignore _STA (ACPI DIMM device) status");
36
37 struct nfit_table_prev {
38 struct list_head spas;
39 struct list_head memdevs;
40 struct list_head dcrs;
41 struct list_head bdws;
42 struct list_head idts;
43 struct list_head flushes;
44 };
45
46 static u8 nfit_uuid[NFIT_UUID_MAX][16];
47
48 const u8 *to_nfit_uuid(enum nfit_uuids id)
49 {
50 return nfit_uuid[id];
51 }
52 EXPORT_SYMBOL(to_nfit_uuid);
53
54 static struct acpi_nfit_desc *to_acpi_nfit_desc(
55 struct nvdimm_bus_descriptor *nd_desc)
56 {
57 return container_of(nd_desc, struct acpi_nfit_desc, nd_desc);
58 }
59
60 static struct acpi_device *to_acpi_dev(struct acpi_nfit_desc *acpi_desc)
61 {
62 struct nvdimm_bus_descriptor *nd_desc = &acpi_desc->nd_desc;
63
64 /*
65 * If provider == 'ACPI.NFIT' we can assume 'dev' is a struct
66 * acpi_device.
67 */
68 if (!nd_desc->provider_name
69 || strcmp(nd_desc->provider_name, "ACPI.NFIT") != 0)
70 return NULL;
71
72 return to_acpi_device(acpi_desc->dev);
73 }
74
75 static int acpi_nfit_ctl(struct nvdimm_bus_descriptor *nd_desc,
76 struct nvdimm *nvdimm, unsigned int cmd, void *buf,
77 unsigned int buf_len)
78 {
79 struct acpi_nfit_desc *acpi_desc = to_acpi_nfit_desc(nd_desc);
80 const struct nd_cmd_desc *desc = NULL;
81 union acpi_object in_obj, in_buf, *out_obj;
82 struct device *dev = acpi_desc->dev;
83 const char *cmd_name, *dimm_name;
84 unsigned long dsm_mask;
85 acpi_handle handle;
86 const u8 *uuid;
87 u32 offset;
88 int rc, i;
89
90 if (nvdimm) {
91 struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
92 struct acpi_device *adev = nfit_mem->adev;
93
94 if (!adev)
95 return -ENOTTY;
96 dimm_name = nvdimm_name(nvdimm);
97 cmd_name = nvdimm_cmd_name(cmd);
98 dsm_mask = nfit_mem->dsm_mask;
99 desc = nd_cmd_dimm_desc(cmd);
100 uuid = to_nfit_uuid(NFIT_DEV_DIMM);
101 handle = adev->handle;
102 } else {
103 struct acpi_device *adev = to_acpi_dev(acpi_desc);
104
105 cmd_name = nvdimm_bus_cmd_name(cmd);
106 dsm_mask = nd_desc->dsm_mask;
107 desc = nd_cmd_bus_desc(cmd);
108 uuid = to_nfit_uuid(NFIT_DEV_BUS);
109 handle = adev->handle;
110 dimm_name = "bus";
111 }
112
113 if (!desc || (cmd && (desc->out_num + desc->in_num == 0)))
114 return -ENOTTY;
115
116 if (!test_bit(cmd, &dsm_mask))
117 return -ENOTTY;
118
119 in_obj.type = ACPI_TYPE_PACKAGE;
120 in_obj.package.count = 1;
121 in_obj.package.elements = &in_buf;
122 in_buf.type = ACPI_TYPE_BUFFER;
123 in_buf.buffer.pointer = buf;
124 in_buf.buffer.length = 0;
125
126 /* libnvdimm has already validated the input envelope */
127 for (i = 0; i < desc->in_num; i++)
128 in_buf.buffer.length += nd_cmd_in_size(nvdimm, cmd, desc,
129 i, buf);
130
131 if (IS_ENABLED(CONFIG_ACPI_NFIT_DEBUG)) {
132 dev_dbg(dev, "%s:%s cmd: %s input length: %d\n", __func__,
133 dimm_name, cmd_name, in_buf.buffer.length);
134 print_hex_dump_debug(cmd_name, DUMP_PREFIX_OFFSET, 4,
135 4, in_buf.buffer.pointer, min_t(u32, 128,
136 in_buf.buffer.length), true);
137 }
138
139 out_obj = acpi_evaluate_dsm(handle, uuid, 1, cmd, &in_obj);
140 if (!out_obj) {
141 dev_dbg(dev, "%s:%s _DSM failed cmd: %s\n", __func__, dimm_name,
142 cmd_name);
143 return -EINVAL;
144 }
145
146 if (out_obj->package.type != ACPI_TYPE_BUFFER) {
147 dev_dbg(dev, "%s:%s unexpected output object type cmd: %s type: %d\n",
148 __func__, dimm_name, cmd_name, out_obj->type);
149 rc = -EINVAL;
150 goto out;
151 }
152
153 if (IS_ENABLED(CONFIG_ACPI_NFIT_DEBUG)) {
154 dev_dbg(dev, "%s:%s cmd: %s output length: %d\n", __func__,
155 dimm_name, cmd_name, out_obj->buffer.length);
156 print_hex_dump_debug(cmd_name, DUMP_PREFIX_OFFSET, 4,
157 4, out_obj->buffer.pointer, min_t(u32, 128,
158 out_obj->buffer.length), true);
159 }
160
161 for (i = 0, offset = 0; i < desc->out_num; i++) {
162 u32 out_size = nd_cmd_out_size(nvdimm, cmd, desc, i, buf,
163 (u32 *) out_obj->buffer.pointer);
164
165 if (offset + out_size > out_obj->buffer.length) {
166 dev_dbg(dev, "%s:%s output object underflow cmd: %s field: %d\n",
167 __func__, dimm_name, cmd_name, i);
168 break;
169 }
170
171 if (in_buf.buffer.length + offset + out_size > buf_len) {
172 dev_dbg(dev, "%s:%s output overrun cmd: %s field: %d\n",
173 __func__, dimm_name, cmd_name, i);
174 rc = -ENXIO;
175 goto out;
176 }
177 memcpy(buf + in_buf.buffer.length + offset,
178 out_obj->buffer.pointer + offset, out_size);
179 offset += out_size;
180 }
181 if (offset + in_buf.buffer.length < buf_len) {
182 if (i >= 1) {
183 /*
184 * status valid, return the number of bytes left
185 * unfilled in the output buffer
186 */
187 rc = buf_len - offset - in_buf.buffer.length;
188 } else {
189 dev_err(dev, "%s:%s underrun cmd: %s buf_len: %d out_len: %d\n",
190 __func__, dimm_name, cmd_name, buf_len,
191 offset);
192 rc = -ENXIO;
193 }
194 } else
195 rc = 0;
196
197 out:
198 ACPI_FREE(out_obj);
199
200 return rc;
201 }
202
203 static const char *spa_type_name(u16 type)
204 {
205 static const char *to_name[] = {
206 [NFIT_SPA_VOLATILE] = "volatile",
207 [NFIT_SPA_PM] = "pmem",
208 [NFIT_SPA_DCR] = "dimm-control-region",
209 [NFIT_SPA_BDW] = "block-data-window",
210 [NFIT_SPA_VDISK] = "volatile-disk",
211 [NFIT_SPA_VCD] = "volatile-cd",
212 [NFIT_SPA_PDISK] = "persistent-disk",
213 [NFIT_SPA_PCD] = "persistent-cd",
214
215 };
216
217 if (type > NFIT_SPA_PCD)
218 return "unknown";
219
220 return to_name[type];
221 }
222
223 static int nfit_spa_type(struct acpi_nfit_system_address *spa)
224 {
225 int i;
226
227 for (i = 0; i < NFIT_UUID_MAX; i++)
228 if (memcmp(to_nfit_uuid(i), spa->range_guid, 16) == 0)
229 return i;
230 return -1;
231 }
232
233 static bool add_spa(struct acpi_nfit_desc *acpi_desc,
234 struct nfit_table_prev *prev,
235 struct acpi_nfit_system_address *spa)
236 {
237 size_t length = min_t(size_t, sizeof(*spa), spa->header.length);
238 struct device *dev = acpi_desc->dev;
239 struct nfit_spa *nfit_spa;
240
241 list_for_each_entry(nfit_spa, &prev->spas, list) {
242 if (memcmp(nfit_spa->spa, spa, length) == 0) {
243 list_move_tail(&nfit_spa->list, &acpi_desc->spas);
244 return true;
245 }
246 }
247
248 nfit_spa = devm_kzalloc(dev, sizeof(*nfit_spa), GFP_KERNEL);
249 if (!nfit_spa)
250 return false;
251 INIT_LIST_HEAD(&nfit_spa->list);
252 nfit_spa->spa = spa;
253 list_add_tail(&nfit_spa->list, &acpi_desc->spas);
254 dev_dbg(dev, "%s: spa index: %d type: %s\n", __func__,
255 spa->range_index,
256 spa_type_name(nfit_spa_type(spa)));
257 return true;
258 }
259
260 static bool add_memdev(struct acpi_nfit_desc *acpi_desc,
261 struct nfit_table_prev *prev,
262 struct acpi_nfit_memory_map *memdev)
263 {
264 size_t length = min_t(size_t, sizeof(*memdev), memdev->header.length);
265 struct device *dev = acpi_desc->dev;
266 struct nfit_memdev *nfit_memdev;
267
268 list_for_each_entry(nfit_memdev, &prev->memdevs, list)
269 if (memcmp(nfit_memdev->memdev, memdev, length) == 0) {
270 list_move_tail(&nfit_memdev->list, &acpi_desc->memdevs);
271 return true;
272 }
273
274 nfit_memdev = devm_kzalloc(dev, sizeof(*nfit_memdev), GFP_KERNEL);
275 if (!nfit_memdev)
276 return false;
277 INIT_LIST_HEAD(&nfit_memdev->list);
278 nfit_memdev->memdev = memdev;
279 list_add_tail(&nfit_memdev->list, &acpi_desc->memdevs);
280 dev_dbg(dev, "%s: memdev handle: %#x spa: %d dcr: %d\n",
281 __func__, memdev->device_handle, memdev->range_index,
282 memdev->region_index);
283 return true;
284 }
285
286 static bool add_dcr(struct acpi_nfit_desc *acpi_desc,
287 struct nfit_table_prev *prev,
288 struct acpi_nfit_control_region *dcr)
289 {
290 size_t length = min_t(size_t, sizeof(*dcr), dcr->header.length);
291 struct device *dev = acpi_desc->dev;
292 struct nfit_dcr *nfit_dcr;
293
294 list_for_each_entry(nfit_dcr, &prev->dcrs, list)
295 if (memcmp(nfit_dcr->dcr, dcr, length) == 0) {
296 list_move_tail(&nfit_dcr->list, &acpi_desc->dcrs);
297 return true;
298 }
299
300 nfit_dcr = devm_kzalloc(dev, sizeof(*nfit_dcr), GFP_KERNEL);
301 if (!nfit_dcr)
302 return false;
303 INIT_LIST_HEAD(&nfit_dcr->list);
304 nfit_dcr->dcr = dcr;
305 list_add_tail(&nfit_dcr->list, &acpi_desc->dcrs);
306 dev_dbg(dev, "%s: dcr index: %d windows: %d\n", __func__,
307 dcr->region_index, dcr->windows);
308 return true;
309 }
310
311 static bool add_bdw(struct acpi_nfit_desc *acpi_desc,
312 struct nfit_table_prev *prev,
313 struct acpi_nfit_data_region *bdw)
314 {
315 size_t length = min_t(size_t, sizeof(*bdw), bdw->header.length);
316 struct device *dev = acpi_desc->dev;
317 struct nfit_bdw *nfit_bdw;
318
319 list_for_each_entry(nfit_bdw, &prev->bdws, list)
320 if (memcmp(nfit_bdw->bdw, bdw, length) == 0) {
321 list_move_tail(&nfit_bdw->list, &acpi_desc->bdws);
322 return true;
323 }
324
325 nfit_bdw = devm_kzalloc(dev, sizeof(*nfit_bdw), GFP_KERNEL);
326 if (!nfit_bdw)
327 return false;
328 INIT_LIST_HEAD(&nfit_bdw->list);
329 nfit_bdw->bdw = bdw;
330 list_add_tail(&nfit_bdw->list, &acpi_desc->bdws);
331 dev_dbg(dev, "%s: bdw dcr: %d windows: %d\n", __func__,
332 bdw->region_index, bdw->windows);
333 return true;
334 }
335
336 static bool add_idt(struct acpi_nfit_desc *acpi_desc,
337 struct nfit_table_prev *prev,
338 struct acpi_nfit_interleave *idt)
339 {
340 size_t length = min_t(size_t, sizeof(*idt), idt->header.length);
341 struct device *dev = acpi_desc->dev;
342 struct nfit_idt *nfit_idt;
343
344 list_for_each_entry(nfit_idt, &prev->idts, list)
345 if (memcmp(nfit_idt->idt, idt, length) == 0) {
346 list_move_tail(&nfit_idt->list, &acpi_desc->idts);
347 return true;
348 }
349
350 nfit_idt = devm_kzalloc(dev, sizeof(*nfit_idt), GFP_KERNEL);
351 if (!nfit_idt)
352 return false;
353 INIT_LIST_HEAD(&nfit_idt->list);
354 nfit_idt->idt = idt;
355 list_add_tail(&nfit_idt->list, &acpi_desc->idts);
356 dev_dbg(dev, "%s: idt index: %d num_lines: %d\n", __func__,
357 idt->interleave_index, idt->line_count);
358 return true;
359 }
360
361 static bool add_flush(struct acpi_nfit_desc *acpi_desc,
362 struct nfit_table_prev *prev,
363 struct acpi_nfit_flush_address *flush)
364 {
365 size_t length = min_t(size_t, sizeof(*flush), flush->header.length);
366 struct device *dev = acpi_desc->dev;
367 struct nfit_flush *nfit_flush;
368
369 list_for_each_entry(nfit_flush, &prev->flushes, list)
370 if (memcmp(nfit_flush->flush, flush, length) == 0) {
371 list_move_tail(&nfit_flush->list, &acpi_desc->flushes);
372 return true;
373 }
374
375 nfit_flush = devm_kzalloc(dev, sizeof(*nfit_flush), GFP_KERNEL);
376 if (!nfit_flush)
377 return false;
378 INIT_LIST_HEAD(&nfit_flush->list);
379 nfit_flush->flush = flush;
380 list_add_tail(&nfit_flush->list, &acpi_desc->flushes);
381 dev_dbg(dev, "%s: nfit_flush handle: %d hint_count: %d\n", __func__,
382 flush->device_handle, flush->hint_count);
383 return true;
384 }
385
386 static void *add_table(struct acpi_nfit_desc *acpi_desc,
387 struct nfit_table_prev *prev, void *table, const void *end)
388 {
389 struct device *dev = acpi_desc->dev;
390 struct acpi_nfit_header *hdr;
391 void *err = ERR_PTR(-ENOMEM);
392
393 if (table >= end)
394 return NULL;
395
396 hdr = table;
397 if (!hdr->length) {
398 dev_warn(dev, "found a zero length table '%d' parsing nfit\n",
399 hdr->type);
400 return NULL;
401 }
402
403 switch (hdr->type) {
404 case ACPI_NFIT_TYPE_SYSTEM_ADDRESS:
405 if (!add_spa(acpi_desc, prev, table))
406 return err;
407 break;
408 case ACPI_NFIT_TYPE_MEMORY_MAP:
409 if (!add_memdev(acpi_desc, prev, table))
410 return err;
411 break;
412 case ACPI_NFIT_TYPE_CONTROL_REGION:
413 if (!add_dcr(acpi_desc, prev, table))
414 return err;
415 break;
416 case ACPI_NFIT_TYPE_DATA_REGION:
417 if (!add_bdw(acpi_desc, prev, table))
418 return err;
419 break;
420 case ACPI_NFIT_TYPE_INTERLEAVE:
421 if (!add_idt(acpi_desc, prev, table))
422 return err;
423 break;
424 case ACPI_NFIT_TYPE_FLUSH_ADDRESS:
425 if (!add_flush(acpi_desc, prev, table))
426 return err;
427 break;
428 case ACPI_NFIT_TYPE_SMBIOS:
429 dev_dbg(dev, "%s: smbios\n", __func__);
430 break;
431 default:
432 dev_err(dev, "unknown table '%d' parsing nfit\n", hdr->type);
433 break;
434 }
435
436 return table + hdr->length;
437 }
438
439 static void nfit_mem_find_spa_bdw(struct acpi_nfit_desc *acpi_desc,
440 struct nfit_mem *nfit_mem)
441 {
442 u32 device_handle = __to_nfit_memdev(nfit_mem)->device_handle;
443 u16 dcr = nfit_mem->dcr->region_index;
444 struct nfit_spa *nfit_spa;
445
446 list_for_each_entry(nfit_spa, &acpi_desc->spas, list) {
447 u16 range_index = nfit_spa->spa->range_index;
448 int type = nfit_spa_type(nfit_spa->spa);
449 struct nfit_memdev *nfit_memdev;
450
451 if (type != NFIT_SPA_BDW)
452 continue;
453
454 list_for_each_entry(nfit_memdev, &acpi_desc->memdevs, list) {
455 if (nfit_memdev->memdev->range_index != range_index)
456 continue;
457 if (nfit_memdev->memdev->device_handle != device_handle)
458 continue;
459 if (nfit_memdev->memdev->region_index != dcr)
460 continue;
461
462 nfit_mem->spa_bdw = nfit_spa->spa;
463 return;
464 }
465 }
466
467 dev_dbg(acpi_desc->dev, "SPA-BDW not found for SPA-DCR %d\n",
468 nfit_mem->spa_dcr->range_index);
469 nfit_mem->bdw = NULL;
470 }
471
472 static int nfit_mem_add(struct acpi_nfit_desc *acpi_desc,
473 struct nfit_mem *nfit_mem, struct acpi_nfit_system_address *spa)
474 {
475 u16 dcr = __to_nfit_memdev(nfit_mem)->region_index;
476 struct nfit_memdev *nfit_memdev;
477 struct nfit_flush *nfit_flush;
478 struct nfit_dcr *nfit_dcr;
479 struct nfit_bdw *nfit_bdw;
480 struct nfit_idt *nfit_idt;
481 u16 idt_idx, range_index;
482
483 list_for_each_entry(nfit_dcr, &acpi_desc->dcrs, list) {
484 if (nfit_dcr->dcr->region_index != dcr)
485 continue;
486 nfit_mem->dcr = nfit_dcr->dcr;
487 break;
488 }
489
490 if (!nfit_mem->dcr) {
491 dev_dbg(acpi_desc->dev, "SPA %d missing:%s%s\n",
492 spa->range_index, __to_nfit_memdev(nfit_mem)
493 ? "" : " MEMDEV", nfit_mem->dcr ? "" : " DCR");
494 return -ENODEV;
495 }
496
497 /*
498 * We've found enough to create an nvdimm, optionally
499 * find an associated BDW
500 */
501 list_add(&nfit_mem->list, &acpi_desc->dimms);
502
503 list_for_each_entry(nfit_bdw, &acpi_desc->bdws, list) {
504 if (nfit_bdw->bdw->region_index != dcr)
505 continue;
506 nfit_mem->bdw = nfit_bdw->bdw;
507 break;
508 }
509
510 if (!nfit_mem->bdw)
511 return 0;
512
513 nfit_mem_find_spa_bdw(acpi_desc, nfit_mem);
514
515 if (!nfit_mem->spa_bdw)
516 return 0;
517
518 range_index = nfit_mem->spa_bdw->range_index;
519 list_for_each_entry(nfit_memdev, &acpi_desc->memdevs, list) {
520 if (nfit_memdev->memdev->range_index != range_index ||
521 nfit_memdev->memdev->region_index != dcr)
522 continue;
523 nfit_mem->memdev_bdw = nfit_memdev->memdev;
524 idt_idx = nfit_memdev->memdev->interleave_index;
525 list_for_each_entry(nfit_idt, &acpi_desc->idts, list) {
526 if (nfit_idt->idt->interleave_index != idt_idx)
527 continue;
528 nfit_mem->idt_bdw = nfit_idt->idt;
529 break;
530 }
531
532 list_for_each_entry(nfit_flush, &acpi_desc->flushes, list) {
533 if (nfit_flush->flush->device_handle !=
534 nfit_memdev->memdev->device_handle)
535 continue;
536 nfit_mem->nfit_flush = nfit_flush;
537 break;
538 }
539 break;
540 }
541
542 return 0;
543 }
544
545 static int nfit_mem_dcr_init(struct acpi_nfit_desc *acpi_desc,
546 struct acpi_nfit_system_address *spa)
547 {
548 struct nfit_mem *nfit_mem, *found;
549 struct nfit_memdev *nfit_memdev;
550 int type = nfit_spa_type(spa);
551 u16 dcr;
552
553 switch (type) {
554 case NFIT_SPA_DCR:
555 case NFIT_SPA_PM:
556 break;
557 default:
558 return 0;
559 }
560
561 list_for_each_entry(nfit_memdev, &acpi_desc->memdevs, list) {
562 int rc;
563
564 if (nfit_memdev->memdev->range_index != spa->range_index)
565 continue;
566 found = NULL;
567 dcr = nfit_memdev->memdev->region_index;
568 list_for_each_entry(nfit_mem, &acpi_desc->dimms, list)
569 if (__to_nfit_memdev(nfit_mem)->region_index == dcr) {
570 found = nfit_mem;
571 break;
572 }
573
574 if (found)
575 nfit_mem = found;
576 else {
577 nfit_mem = devm_kzalloc(acpi_desc->dev,
578 sizeof(*nfit_mem), GFP_KERNEL);
579 if (!nfit_mem)
580 return -ENOMEM;
581 INIT_LIST_HEAD(&nfit_mem->list);
582 }
583
584 if (type == NFIT_SPA_DCR) {
585 struct nfit_idt *nfit_idt;
586 u16 idt_idx;
587
588 /* multiple dimms may share a SPA when interleaved */
589 nfit_mem->spa_dcr = spa;
590 nfit_mem->memdev_dcr = nfit_memdev->memdev;
591 idt_idx = nfit_memdev->memdev->interleave_index;
592 list_for_each_entry(nfit_idt, &acpi_desc->idts, list) {
593 if (nfit_idt->idt->interleave_index != idt_idx)
594 continue;
595 nfit_mem->idt_dcr = nfit_idt->idt;
596 break;
597 }
598 } else {
599 /*
600 * A single dimm may belong to multiple SPA-PM
601 * ranges, record at least one in addition to
602 * any SPA-DCR range.
603 */
604 nfit_mem->memdev_pmem = nfit_memdev->memdev;
605 }
606
607 if (found)
608 continue;
609
610 rc = nfit_mem_add(acpi_desc, nfit_mem, spa);
611 if (rc)
612 return rc;
613 }
614
615 return 0;
616 }
617
618 static int nfit_mem_cmp(void *priv, struct list_head *_a, struct list_head *_b)
619 {
620 struct nfit_mem *a = container_of(_a, typeof(*a), list);
621 struct nfit_mem *b = container_of(_b, typeof(*b), list);
622 u32 handleA, handleB;
623
624 handleA = __to_nfit_memdev(a)->device_handle;
625 handleB = __to_nfit_memdev(b)->device_handle;
626 if (handleA < handleB)
627 return -1;
628 else if (handleA > handleB)
629 return 1;
630 return 0;
631 }
632
633 static int nfit_mem_init(struct acpi_nfit_desc *acpi_desc)
634 {
635 struct nfit_spa *nfit_spa;
636
637 /*
638 * For each SPA-DCR or SPA-PMEM address range find its
639 * corresponding MEMDEV(s). From each MEMDEV find the
640 * corresponding DCR. Then, if we're operating on a SPA-DCR,
641 * try to find a SPA-BDW and a corresponding BDW that references
642 * the DCR. Throw it all into an nfit_mem object. Note, that
643 * BDWs are optional.
644 */
645 list_for_each_entry(nfit_spa, &acpi_desc->spas, list) {
646 int rc;
647
648 rc = nfit_mem_dcr_init(acpi_desc, nfit_spa->spa);
649 if (rc)
650 return rc;
651 }
652
653 list_sort(NULL, &acpi_desc->dimms, nfit_mem_cmp);
654
655 return 0;
656 }
657
658 static ssize_t revision_show(struct device *dev,
659 struct device_attribute *attr, char *buf)
660 {
661 struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev);
662 struct nvdimm_bus_descriptor *nd_desc = to_nd_desc(nvdimm_bus);
663 struct acpi_nfit_desc *acpi_desc = to_acpi_desc(nd_desc);
664
665 return sprintf(buf, "%d\n", acpi_desc->acpi_header.revision);
666 }
667 static DEVICE_ATTR_RO(revision);
668
669 static struct attribute *acpi_nfit_attributes[] = {
670 &dev_attr_revision.attr,
671 NULL,
672 };
673
674 static struct attribute_group acpi_nfit_attribute_group = {
675 .name = "nfit",
676 .attrs = acpi_nfit_attributes,
677 };
678
679 const struct attribute_group *acpi_nfit_attribute_groups[] = {
680 &nvdimm_bus_attribute_group,
681 &acpi_nfit_attribute_group,
682 NULL,
683 };
684 EXPORT_SYMBOL_GPL(acpi_nfit_attribute_groups);
685
686 static struct acpi_nfit_memory_map *to_nfit_memdev(struct device *dev)
687 {
688 struct nvdimm *nvdimm = to_nvdimm(dev);
689 struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
690
691 return __to_nfit_memdev(nfit_mem);
692 }
693
694 static struct acpi_nfit_control_region *to_nfit_dcr(struct device *dev)
695 {
696 struct nvdimm *nvdimm = to_nvdimm(dev);
697 struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
698
699 return nfit_mem->dcr;
700 }
701
702 static ssize_t handle_show(struct device *dev,
703 struct device_attribute *attr, char *buf)
704 {
705 struct acpi_nfit_memory_map *memdev = to_nfit_memdev(dev);
706
707 return sprintf(buf, "%#x\n", memdev->device_handle);
708 }
709 static DEVICE_ATTR_RO(handle);
710
711 static ssize_t phys_id_show(struct device *dev,
712 struct device_attribute *attr, char *buf)
713 {
714 struct acpi_nfit_memory_map *memdev = to_nfit_memdev(dev);
715
716 return sprintf(buf, "%#x\n", memdev->physical_id);
717 }
718 static DEVICE_ATTR_RO(phys_id);
719
720 static ssize_t vendor_show(struct device *dev,
721 struct device_attribute *attr, char *buf)
722 {
723 struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev);
724
725 return sprintf(buf, "%#x\n", dcr->vendor_id);
726 }
727 static DEVICE_ATTR_RO(vendor);
728
729 static ssize_t rev_id_show(struct device *dev,
730 struct device_attribute *attr, char *buf)
731 {
732 struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev);
733
734 return sprintf(buf, "%#x\n", dcr->revision_id);
735 }
736 static DEVICE_ATTR_RO(rev_id);
737
738 static ssize_t device_show(struct device *dev,
739 struct device_attribute *attr, char *buf)
740 {
741 struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev);
742
743 return sprintf(buf, "%#x\n", dcr->device_id);
744 }
745 static DEVICE_ATTR_RO(device);
746
747 static ssize_t format_show(struct device *dev,
748 struct device_attribute *attr, char *buf)
749 {
750 struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev);
751
752 return sprintf(buf, "%#x\n", dcr->code);
753 }
754 static DEVICE_ATTR_RO(format);
755
756 static ssize_t serial_show(struct device *dev,
757 struct device_attribute *attr, char *buf)
758 {
759 struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev);
760
761 return sprintf(buf, "%#x\n", dcr->serial_number);
762 }
763 static DEVICE_ATTR_RO(serial);
764
765 static ssize_t flags_show(struct device *dev,
766 struct device_attribute *attr, char *buf)
767 {
768 u16 flags = to_nfit_memdev(dev)->flags;
769
770 return sprintf(buf, "%s%s%s%s%s\n",
771 flags & ACPI_NFIT_MEM_SAVE_FAILED ? "save_fail " : "",
772 flags & ACPI_NFIT_MEM_RESTORE_FAILED ? "restore_fail " : "",
773 flags & ACPI_NFIT_MEM_FLUSH_FAILED ? "flush_fail " : "",
774 flags & ACPI_NFIT_MEM_NOT_ARMED ? "not_armed " : "",
775 flags & ACPI_NFIT_MEM_HEALTH_OBSERVED ? "smart_event " : "");
776 }
777 static DEVICE_ATTR_RO(flags);
778
779 static struct attribute *acpi_nfit_dimm_attributes[] = {
780 &dev_attr_handle.attr,
781 &dev_attr_phys_id.attr,
782 &dev_attr_vendor.attr,
783 &dev_attr_device.attr,
784 &dev_attr_format.attr,
785 &dev_attr_serial.attr,
786 &dev_attr_rev_id.attr,
787 &dev_attr_flags.attr,
788 NULL,
789 };
790
791 static umode_t acpi_nfit_dimm_attr_visible(struct kobject *kobj,
792 struct attribute *a, int n)
793 {
794 struct device *dev = container_of(kobj, struct device, kobj);
795
796 if (to_nfit_dcr(dev))
797 return a->mode;
798 else
799 return 0;
800 }
801
802 static struct attribute_group acpi_nfit_dimm_attribute_group = {
803 .name = "nfit",
804 .attrs = acpi_nfit_dimm_attributes,
805 .is_visible = acpi_nfit_dimm_attr_visible,
806 };
807
808 static const struct attribute_group *acpi_nfit_dimm_attribute_groups[] = {
809 &nvdimm_attribute_group,
810 &nd_device_attribute_group,
811 &acpi_nfit_dimm_attribute_group,
812 NULL,
813 };
814
815 static struct nvdimm *acpi_nfit_dimm_by_handle(struct acpi_nfit_desc *acpi_desc,
816 u32 device_handle)
817 {
818 struct nfit_mem *nfit_mem;
819
820 list_for_each_entry(nfit_mem, &acpi_desc->dimms, list)
821 if (__to_nfit_memdev(nfit_mem)->device_handle == device_handle)
822 return nfit_mem->nvdimm;
823
824 return NULL;
825 }
826
827 static int acpi_nfit_add_dimm(struct acpi_nfit_desc *acpi_desc,
828 struct nfit_mem *nfit_mem, u32 device_handle)
829 {
830 struct acpi_device *adev, *adev_dimm;
831 struct device *dev = acpi_desc->dev;
832 const u8 *uuid = to_nfit_uuid(NFIT_DEV_DIMM);
833 int i;
834
835 nfit_mem->dsm_mask = acpi_desc->dimm_dsm_force_en;
836 adev = to_acpi_dev(acpi_desc);
837 if (!adev)
838 return 0;
839
840 adev_dimm = acpi_find_child_device(adev, device_handle, false);
841 nfit_mem->adev = adev_dimm;
842 if (!adev_dimm) {
843 dev_err(dev, "no ACPI.NFIT device with _ADR %#x, disabling...\n",
844 device_handle);
845 return force_enable_dimms ? 0 : -ENODEV;
846 }
847
848 for (i = ND_CMD_SMART; i <= ND_CMD_VENDOR; i++)
849 if (acpi_check_dsm(adev_dimm->handle, uuid, 1, 1ULL << i))
850 set_bit(i, &nfit_mem->dsm_mask);
851
852 return 0;
853 }
854
855 static int acpi_nfit_register_dimms(struct acpi_nfit_desc *acpi_desc)
856 {
857 struct nfit_mem *nfit_mem;
858 int dimm_count = 0;
859
860 list_for_each_entry(nfit_mem, &acpi_desc->dimms, list) {
861 struct nvdimm *nvdimm;
862 unsigned long flags = 0;
863 u32 device_handle;
864 u16 mem_flags;
865 int rc;
866
867 device_handle = __to_nfit_memdev(nfit_mem)->device_handle;
868 nvdimm = acpi_nfit_dimm_by_handle(acpi_desc, device_handle);
869 if (nvdimm) {
870 dimm_count++;
871 continue;
872 }
873
874 if (nfit_mem->bdw && nfit_mem->memdev_pmem)
875 flags |= NDD_ALIASING;
876
877 mem_flags = __to_nfit_memdev(nfit_mem)->flags;
878 if (mem_flags & ACPI_NFIT_MEM_NOT_ARMED)
879 flags |= NDD_UNARMED;
880
881 rc = acpi_nfit_add_dimm(acpi_desc, nfit_mem, device_handle);
882 if (rc)
883 continue;
884
885 nvdimm = nvdimm_create(acpi_desc->nvdimm_bus, nfit_mem,
886 acpi_nfit_dimm_attribute_groups,
887 flags, &nfit_mem->dsm_mask);
888 if (!nvdimm)
889 return -ENOMEM;
890
891 nfit_mem->nvdimm = nvdimm;
892 dimm_count++;
893
894 if ((mem_flags & ACPI_NFIT_MEM_FAILED_MASK) == 0)
895 continue;
896
897 dev_info(acpi_desc->dev, "%s flags:%s%s%s%s\n",
898 nvdimm_name(nvdimm),
899 mem_flags & ACPI_NFIT_MEM_SAVE_FAILED ? " save_fail" : "",
900 mem_flags & ACPI_NFIT_MEM_RESTORE_FAILED ? " restore_fail":"",
901 mem_flags & ACPI_NFIT_MEM_FLUSH_FAILED ? " flush_fail" : "",
902 mem_flags & ACPI_NFIT_MEM_NOT_ARMED ? " not_armed" : "");
903
904 }
905
906 return nvdimm_bus_check_dimm_count(acpi_desc->nvdimm_bus, dimm_count);
907 }
908
909 static void acpi_nfit_init_dsms(struct acpi_nfit_desc *acpi_desc)
910 {
911 struct nvdimm_bus_descriptor *nd_desc = &acpi_desc->nd_desc;
912 const u8 *uuid = to_nfit_uuid(NFIT_DEV_BUS);
913 struct acpi_device *adev;
914 int i;
915
916 nd_desc->dsm_mask = acpi_desc->bus_dsm_force_en;
917 adev = to_acpi_dev(acpi_desc);
918 if (!adev)
919 return;
920
921 for (i = ND_CMD_ARS_CAP; i <= ND_CMD_ARS_STATUS; i++)
922 if (acpi_check_dsm(adev->handle, uuid, 1, 1ULL << i))
923 set_bit(i, &nd_desc->dsm_mask);
924 }
925
926 static ssize_t range_index_show(struct device *dev,
927 struct device_attribute *attr, char *buf)
928 {
929 struct nd_region *nd_region = to_nd_region(dev);
930 struct nfit_spa *nfit_spa = nd_region_provider_data(nd_region);
931
932 return sprintf(buf, "%d\n", nfit_spa->spa->range_index);
933 }
934 static DEVICE_ATTR_RO(range_index);
935
936 static struct attribute *acpi_nfit_region_attributes[] = {
937 &dev_attr_range_index.attr,
938 NULL,
939 };
940
941 static struct attribute_group acpi_nfit_region_attribute_group = {
942 .name = "nfit",
943 .attrs = acpi_nfit_region_attributes,
944 };
945
946 static const struct attribute_group *acpi_nfit_region_attribute_groups[] = {
947 &nd_region_attribute_group,
948 &nd_mapping_attribute_group,
949 &nd_device_attribute_group,
950 &nd_numa_attribute_group,
951 &acpi_nfit_region_attribute_group,
952 NULL,
953 };
954
955 /* enough info to uniquely specify an interleave set */
956 struct nfit_set_info {
957 struct nfit_set_info_map {
958 u64 region_offset;
959 u32 serial_number;
960 u32 pad;
961 } mapping[0];
962 };
963
964 static size_t sizeof_nfit_set_info(int num_mappings)
965 {
966 return sizeof(struct nfit_set_info)
967 + num_mappings * sizeof(struct nfit_set_info_map);
968 }
969
970 static int cmp_map(const void *m0, const void *m1)
971 {
972 const struct nfit_set_info_map *map0 = m0;
973 const struct nfit_set_info_map *map1 = m1;
974
975 return memcmp(&map0->region_offset, &map1->region_offset,
976 sizeof(u64));
977 }
978
979 /* Retrieve the nth entry referencing this spa */
980 static struct acpi_nfit_memory_map *memdev_from_spa(
981 struct acpi_nfit_desc *acpi_desc, u16 range_index, int n)
982 {
983 struct nfit_memdev *nfit_memdev;
984
985 list_for_each_entry(nfit_memdev, &acpi_desc->memdevs, list)
986 if (nfit_memdev->memdev->range_index == range_index)
987 if (n-- == 0)
988 return nfit_memdev->memdev;
989 return NULL;
990 }
991
992 static int acpi_nfit_init_interleave_set(struct acpi_nfit_desc *acpi_desc,
993 struct nd_region_desc *ndr_desc,
994 struct acpi_nfit_system_address *spa)
995 {
996 int i, spa_type = nfit_spa_type(spa);
997 struct device *dev = acpi_desc->dev;
998 struct nd_interleave_set *nd_set;
999 u16 nr = ndr_desc->num_mappings;
1000 struct nfit_set_info *info;
1001
1002 if (spa_type == NFIT_SPA_PM || spa_type == NFIT_SPA_VOLATILE)
1003 /* pass */;
1004 else
1005 return 0;
1006
1007 nd_set = devm_kzalloc(dev, sizeof(*nd_set), GFP_KERNEL);
1008 if (!nd_set)
1009 return -ENOMEM;
1010
1011 info = devm_kzalloc(dev, sizeof_nfit_set_info(nr), GFP_KERNEL);
1012 if (!info)
1013 return -ENOMEM;
1014 for (i = 0; i < nr; i++) {
1015 struct nd_mapping *nd_mapping = &ndr_desc->nd_mapping[i];
1016 struct nfit_set_info_map *map = &info->mapping[i];
1017 struct nvdimm *nvdimm = nd_mapping->nvdimm;
1018 struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
1019 struct acpi_nfit_memory_map *memdev = memdev_from_spa(acpi_desc,
1020 spa->range_index, i);
1021
1022 if (!memdev || !nfit_mem->dcr) {
1023 dev_err(dev, "%s: failed to find DCR\n", __func__);
1024 return -ENODEV;
1025 }
1026
1027 map->region_offset = memdev->region_offset;
1028 map->serial_number = nfit_mem->dcr->serial_number;
1029 }
1030
1031 sort(&info->mapping[0], nr, sizeof(struct nfit_set_info_map),
1032 cmp_map, NULL);
1033 nd_set->cookie = nd_fletcher64(info, sizeof_nfit_set_info(nr), 0);
1034 ndr_desc->nd_set = nd_set;
1035 devm_kfree(dev, info);
1036
1037 return 0;
1038 }
1039
1040 static u64 to_interleave_offset(u64 offset, struct nfit_blk_mmio *mmio)
1041 {
1042 struct acpi_nfit_interleave *idt = mmio->idt;
1043 u32 sub_line_offset, line_index, line_offset;
1044 u64 line_no, table_skip_count, table_offset;
1045
1046 line_no = div_u64_rem(offset, mmio->line_size, &sub_line_offset);
1047 table_skip_count = div_u64_rem(line_no, mmio->num_lines, &line_index);
1048 line_offset = idt->line_offset[line_index]
1049 * mmio->line_size;
1050 table_offset = table_skip_count * mmio->table_size;
1051
1052 return mmio->base_offset + line_offset + table_offset + sub_line_offset;
1053 }
1054
1055 static void wmb_blk(struct nfit_blk *nfit_blk)
1056 {
1057
1058 if (nfit_blk->nvdimm_flush) {
1059 /*
1060 * The first wmb() is needed to 'sfence' all previous writes
1061 * such that they are architecturally visible for the platform
1062 * buffer flush. Note that we've already arranged for pmem
1063 * writes to avoid the cache via arch_memcpy_to_pmem(). The
1064 * final wmb() ensures ordering for the NVDIMM flush write.
1065 */
1066 wmb();
1067 writeq(1, nfit_blk->nvdimm_flush);
1068 wmb();
1069 } else
1070 wmb_pmem();
1071 }
1072
1073 static u32 read_blk_stat(struct nfit_blk *nfit_blk, unsigned int bw)
1074 {
1075 struct nfit_blk_mmio *mmio = &nfit_blk->mmio[DCR];
1076 u64 offset = nfit_blk->stat_offset + mmio->size * bw;
1077
1078 if (mmio->num_lines)
1079 offset = to_interleave_offset(offset, mmio);
1080
1081 return readl(mmio->addr.base + offset);
1082 }
1083
1084 static void write_blk_ctl(struct nfit_blk *nfit_blk, unsigned int bw,
1085 resource_size_t dpa, unsigned int len, unsigned int write)
1086 {
1087 u64 cmd, offset;
1088 struct nfit_blk_mmio *mmio = &nfit_blk->mmio[DCR];
1089
1090 enum {
1091 BCW_OFFSET_MASK = (1ULL << 48)-1,
1092 BCW_LEN_SHIFT = 48,
1093 BCW_LEN_MASK = (1ULL << 8) - 1,
1094 BCW_CMD_SHIFT = 56,
1095 };
1096
1097 cmd = (dpa >> L1_CACHE_SHIFT) & BCW_OFFSET_MASK;
1098 len = len >> L1_CACHE_SHIFT;
1099 cmd |= ((u64) len & BCW_LEN_MASK) << BCW_LEN_SHIFT;
1100 cmd |= ((u64) write) << BCW_CMD_SHIFT;
1101
1102 offset = nfit_blk->cmd_offset + mmio->size * bw;
1103 if (mmio->num_lines)
1104 offset = to_interleave_offset(offset, mmio);
1105
1106 writeq(cmd, mmio->addr.base + offset);
1107 wmb_blk(nfit_blk);
1108
1109 if (nfit_blk->dimm_flags & ND_BLK_DCR_LATCH)
1110 readq(mmio->addr.base + offset);
1111 }
1112
1113 static int acpi_nfit_blk_single_io(struct nfit_blk *nfit_blk,
1114 resource_size_t dpa, void *iobuf, size_t len, int rw,
1115 unsigned int lane)
1116 {
1117 struct nfit_blk_mmio *mmio = &nfit_blk->mmio[BDW];
1118 unsigned int copied = 0;
1119 u64 base_offset;
1120 int rc;
1121
1122 base_offset = nfit_blk->bdw_offset + dpa % L1_CACHE_BYTES
1123 + lane * mmio->size;
1124 write_blk_ctl(nfit_blk, lane, dpa, len, rw);
1125 while (len) {
1126 unsigned int c;
1127 u64 offset;
1128
1129 if (mmio->num_lines) {
1130 u32 line_offset;
1131
1132 offset = to_interleave_offset(base_offset + copied,
1133 mmio);
1134 div_u64_rem(offset, mmio->line_size, &line_offset);
1135 c = min_t(size_t, len, mmio->line_size - line_offset);
1136 } else {
1137 offset = base_offset + nfit_blk->bdw_offset;
1138 c = len;
1139 }
1140
1141 if (rw)
1142 memcpy_to_pmem(mmio->addr.aperture + offset,
1143 iobuf + copied, c);
1144 else {
1145 if (nfit_blk->dimm_flags & ND_BLK_READ_FLUSH)
1146 mmio_flush_range((void __force *)
1147 mmio->addr.aperture + offset, c);
1148
1149 memcpy_from_pmem(iobuf + copied,
1150 mmio->addr.aperture + offset, c);
1151 }
1152
1153 copied += c;
1154 len -= c;
1155 }
1156
1157 if (rw)
1158 wmb_blk(nfit_blk);
1159
1160 rc = read_blk_stat(nfit_blk, lane) ? -EIO : 0;
1161 return rc;
1162 }
1163
1164 static int acpi_nfit_blk_region_do_io(struct nd_blk_region *ndbr,
1165 resource_size_t dpa, void *iobuf, u64 len, int rw)
1166 {
1167 struct nfit_blk *nfit_blk = nd_blk_region_provider_data(ndbr);
1168 struct nfit_blk_mmio *mmio = &nfit_blk->mmio[BDW];
1169 struct nd_region *nd_region = nfit_blk->nd_region;
1170 unsigned int lane, copied = 0;
1171 int rc = 0;
1172
1173 lane = nd_region_acquire_lane(nd_region);
1174 while (len) {
1175 u64 c = min(len, mmio->size);
1176
1177 rc = acpi_nfit_blk_single_io(nfit_blk, dpa + copied,
1178 iobuf + copied, c, rw, lane);
1179 if (rc)
1180 break;
1181
1182 copied += c;
1183 len -= c;
1184 }
1185 nd_region_release_lane(nd_region, lane);
1186
1187 return rc;
1188 }
1189
1190 static void nfit_spa_mapping_release(struct kref *kref)
1191 {
1192 struct nfit_spa_mapping *spa_map = to_spa_map(kref);
1193 struct acpi_nfit_system_address *spa = spa_map->spa;
1194 struct acpi_nfit_desc *acpi_desc = spa_map->acpi_desc;
1195
1196 WARN_ON(!mutex_is_locked(&acpi_desc->spa_map_mutex));
1197 dev_dbg(acpi_desc->dev, "%s: SPA%d\n", __func__, spa->range_index);
1198 if (spa_map->type == SPA_MAP_APERTURE)
1199 memunmap((void __force *)spa_map->addr.aperture);
1200 else
1201 iounmap(spa_map->addr.base);
1202 release_mem_region(spa->address, spa->length);
1203 list_del(&spa_map->list);
1204 kfree(spa_map);
1205 }
1206
1207 static struct nfit_spa_mapping *find_spa_mapping(
1208 struct acpi_nfit_desc *acpi_desc,
1209 struct acpi_nfit_system_address *spa)
1210 {
1211 struct nfit_spa_mapping *spa_map;
1212
1213 WARN_ON(!mutex_is_locked(&acpi_desc->spa_map_mutex));
1214 list_for_each_entry(spa_map, &acpi_desc->spa_maps, list)
1215 if (spa_map->spa == spa)
1216 return spa_map;
1217
1218 return NULL;
1219 }
1220
1221 static void nfit_spa_unmap(struct acpi_nfit_desc *acpi_desc,
1222 struct acpi_nfit_system_address *spa)
1223 {
1224 struct nfit_spa_mapping *spa_map;
1225
1226 mutex_lock(&acpi_desc->spa_map_mutex);
1227 spa_map = find_spa_mapping(acpi_desc, spa);
1228
1229 if (spa_map)
1230 kref_put(&spa_map->kref, nfit_spa_mapping_release);
1231 mutex_unlock(&acpi_desc->spa_map_mutex);
1232 }
1233
1234 static void __iomem *__nfit_spa_map(struct acpi_nfit_desc *acpi_desc,
1235 struct acpi_nfit_system_address *spa, enum spa_map_type type)
1236 {
1237 resource_size_t start = spa->address;
1238 resource_size_t n = spa->length;
1239 struct nfit_spa_mapping *spa_map;
1240 struct resource *res;
1241
1242 WARN_ON(!mutex_is_locked(&acpi_desc->spa_map_mutex));
1243
1244 spa_map = find_spa_mapping(acpi_desc, spa);
1245 if (spa_map) {
1246 kref_get(&spa_map->kref);
1247 return spa_map->addr.base;
1248 }
1249
1250 spa_map = kzalloc(sizeof(*spa_map), GFP_KERNEL);
1251 if (!spa_map)
1252 return NULL;
1253
1254 INIT_LIST_HEAD(&spa_map->list);
1255 spa_map->spa = spa;
1256 kref_init(&spa_map->kref);
1257 spa_map->acpi_desc = acpi_desc;
1258
1259 res = request_mem_region(start, n, dev_name(acpi_desc->dev));
1260 if (!res)
1261 goto err_mem;
1262
1263 spa_map->type = type;
1264 if (type == SPA_MAP_APERTURE)
1265 spa_map->addr.aperture = (void __pmem *)memremap(start, n,
1266 ARCH_MEMREMAP_PMEM);
1267 else
1268 spa_map->addr.base = ioremap_nocache(start, n);
1269
1270
1271 if (!spa_map->addr.base)
1272 goto err_map;
1273
1274 list_add_tail(&spa_map->list, &acpi_desc->spa_maps);
1275 return spa_map->addr.base;
1276
1277 err_map:
1278 release_mem_region(start, n);
1279 err_mem:
1280 kfree(spa_map);
1281 return NULL;
1282 }
1283
1284 /**
1285 * nfit_spa_map - interleave-aware managed-mappings of acpi_nfit_system_address ranges
1286 * @nvdimm_bus: NFIT-bus that provided the spa table entry
1287 * @nfit_spa: spa table to map
1288 * @type: aperture or control region
1289 *
1290 * In the case where block-data-window apertures and
1291 * dimm-control-regions are interleaved they will end up sharing a
1292 * single request_mem_region() + ioremap() for the address range. In
1293 * the style of devm nfit_spa_map() mappings are automatically dropped
1294 * when all region devices referencing the same mapping are disabled /
1295 * unbound.
1296 */
1297 static void __iomem *nfit_spa_map(struct acpi_nfit_desc *acpi_desc,
1298 struct acpi_nfit_system_address *spa, enum spa_map_type type)
1299 {
1300 void __iomem *iomem;
1301
1302 mutex_lock(&acpi_desc->spa_map_mutex);
1303 iomem = __nfit_spa_map(acpi_desc, spa, type);
1304 mutex_unlock(&acpi_desc->spa_map_mutex);
1305
1306 return iomem;
1307 }
1308
1309 static int nfit_blk_init_interleave(struct nfit_blk_mmio *mmio,
1310 struct acpi_nfit_interleave *idt, u16 interleave_ways)
1311 {
1312 if (idt) {
1313 mmio->num_lines = idt->line_count;
1314 mmio->line_size = idt->line_size;
1315 if (interleave_ways == 0)
1316 return -ENXIO;
1317 mmio->table_size = mmio->num_lines * interleave_ways
1318 * mmio->line_size;
1319 }
1320
1321 return 0;
1322 }
1323
1324 static int acpi_nfit_blk_get_flags(struct nvdimm_bus_descriptor *nd_desc,
1325 struct nvdimm *nvdimm, struct nfit_blk *nfit_blk)
1326 {
1327 struct nd_cmd_dimm_flags flags;
1328 int rc;
1329
1330 memset(&flags, 0, sizeof(flags));
1331 rc = nd_desc->ndctl(nd_desc, nvdimm, ND_CMD_DIMM_FLAGS, &flags,
1332 sizeof(flags));
1333
1334 if (rc >= 0 && flags.status == 0)
1335 nfit_blk->dimm_flags = flags.flags;
1336 else if (rc == -ENOTTY) {
1337 /* fall back to a conservative default */
1338 nfit_blk->dimm_flags = ND_BLK_DCR_LATCH | ND_BLK_READ_FLUSH;
1339 rc = 0;
1340 } else
1341 rc = -ENXIO;
1342
1343 return rc;
1344 }
1345
1346 static int acpi_nfit_blk_region_enable(struct nvdimm_bus *nvdimm_bus,
1347 struct device *dev)
1348 {
1349 struct nvdimm_bus_descriptor *nd_desc = to_nd_desc(nvdimm_bus);
1350 struct acpi_nfit_desc *acpi_desc = to_acpi_desc(nd_desc);
1351 struct nd_blk_region *ndbr = to_nd_blk_region(dev);
1352 struct nfit_flush *nfit_flush;
1353 struct nfit_blk_mmio *mmio;
1354 struct nfit_blk *nfit_blk;
1355 struct nfit_mem *nfit_mem;
1356 struct nvdimm *nvdimm;
1357 int rc;
1358
1359 nvdimm = nd_blk_region_to_dimm(ndbr);
1360 nfit_mem = nvdimm_provider_data(nvdimm);
1361 if (!nfit_mem || !nfit_mem->dcr || !nfit_mem->bdw) {
1362 dev_dbg(dev, "%s: missing%s%s%s\n", __func__,
1363 nfit_mem ? "" : " nfit_mem",
1364 (nfit_mem && nfit_mem->dcr) ? "" : " dcr",
1365 (nfit_mem && nfit_mem->bdw) ? "" : " bdw");
1366 return -ENXIO;
1367 }
1368
1369 nfit_blk = devm_kzalloc(dev, sizeof(*nfit_blk), GFP_KERNEL);
1370 if (!nfit_blk)
1371 return -ENOMEM;
1372 nd_blk_region_set_provider_data(ndbr, nfit_blk);
1373 nfit_blk->nd_region = to_nd_region(dev);
1374
1375 /* map block aperture memory */
1376 nfit_blk->bdw_offset = nfit_mem->bdw->offset;
1377 mmio = &nfit_blk->mmio[BDW];
1378 mmio->addr.base = nfit_spa_map(acpi_desc, nfit_mem->spa_bdw,
1379 SPA_MAP_APERTURE);
1380 if (!mmio->addr.base) {
1381 dev_dbg(dev, "%s: %s failed to map bdw\n", __func__,
1382 nvdimm_name(nvdimm));
1383 return -ENOMEM;
1384 }
1385 mmio->size = nfit_mem->bdw->size;
1386 mmio->base_offset = nfit_mem->memdev_bdw->region_offset;
1387 mmio->idt = nfit_mem->idt_bdw;
1388 mmio->spa = nfit_mem->spa_bdw;
1389 rc = nfit_blk_init_interleave(mmio, nfit_mem->idt_bdw,
1390 nfit_mem->memdev_bdw->interleave_ways);
1391 if (rc) {
1392 dev_dbg(dev, "%s: %s failed to init bdw interleave\n",
1393 __func__, nvdimm_name(nvdimm));
1394 return rc;
1395 }
1396
1397 /* map block control memory */
1398 nfit_blk->cmd_offset = nfit_mem->dcr->command_offset;
1399 nfit_blk->stat_offset = nfit_mem->dcr->status_offset;
1400 mmio = &nfit_blk->mmio[DCR];
1401 mmio->addr.base = nfit_spa_map(acpi_desc, nfit_mem->spa_dcr,
1402 SPA_MAP_CONTROL);
1403 if (!mmio->addr.base) {
1404 dev_dbg(dev, "%s: %s failed to map dcr\n", __func__,
1405 nvdimm_name(nvdimm));
1406 return -ENOMEM;
1407 }
1408 mmio->size = nfit_mem->dcr->window_size;
1409 mmio->base_offset = nfit_mem->memdev_dcr->region_offset;
1410 mmio->idt = nfit_mem->idt_dcr;
1411 mmio->spa = nfit_mem->spa_dcr;
1412 rc = nfit_blk_init_interleave(mmio, nfit_mem->idt_dcr,
1413 nfit_mem->memdev_dcr->interleave_ways);
1414 if (rc) {
1415 dev_dbg(dev, "%s: %s failed to init dcr interleave\n",
1416 __func__, nvdimm_name(nvdimm));
1417 return rc;
1418 }
1419
1420 rc = acpi_nfit_blk_get_flags(nd_desc, nvdimm, nfit_blk);
1421 if (rc < 0) {
1422 dev_dbg(dev, "%s: %s failed get DIMM flags\n",
1423 __func__, nvdimm_name(nvdimm));
1424 return rc;
1425 }
1426
1427 nfit_flush = nfit_mem->nfit_flush;
1428 if (nfit_flush && nfit_flush->flush->hint_count != 0) {
1429 nfit_blk->nvdimm_flush = devm_ioremap_nocache(dev,
1430 nfit_flush->flush->hint_address[0], 8);
1431 if (!nfit_blk->nvdimm_flush)
1432 return -ENOMEM;
1433 }
1434
1435 if (!arch_has_wmb_pmem() && !nfit_blk->nvdimm_flush)
1436 dev_warn(dev, "unable to guarantee persistence of writes\n");
1437
1438 if (mmio->line_size == 0)
1439 return 0;
1440
1441 if ((u32) nfit_blk->cmd_offset % mmio->line_size
1442 + 8 > mmio->line_size) {
1443 dev_dbg(dev, "cmd_offset crosses interleave boundary\n");
1444 return -ENXIO;
1445 } else if ((u32) nfit_blk->stat_offset % mmio->line_size
1446 + 8 > mmio->line_size) {
1447 dev_dbg(dev, "stat_offset crosses interleave boundary\n");
1448 return -ENXIO;
1449 }
1450
1451 return 0;
1452 }
1453
1454 static void acpi_nfit_blk_region_disable(struct nvdimm_bus *nvdimm_bus,
1455 struct device *dev)
1456 {
1457 struct nvdimm_bus_descriptor *nd_desc = to_nd_desc(nvdimm_bus);
1458 struct acpi_nfit_desc *acpi_desc = to_acpi_desc(nd_desc);
1459 struct nd_blk_region *ndbr = to_nd_blk_region(dev);
1460 struct nfit_blk *nfit_blk = nd_blk_region_provider_data(ndbr);
1461 int i;
1462
1463 if (!nfit_blk)
1464 return; /* never enabled */
1465
1466 /* auto-free BLK spa mappings */
1467 for (i = 0; i < 2; i++) {
1468 struct nfit_blk_mmio *mmio = &nfit_blk->mmio[i];
1469
1470 if (mmio->addr.base)
1471 nfit_spa_unmap(acpi_desc, mmio->spa);
1472 }
1473 nd_blk_region_set_provider_data(ndbr, NULL);
1474 /* devm will free nfit_blk */
1475 }
1476
1477 static int ars_get_cap(struct nvdimm_bus_descriptor *nd_desc,
1478 struct nd_cmd_ars_cap *cmd, u64 addr, u64 length)
1479 {
1480 cmd->address = addr;
1481 cmd->length = length;
1482
1483 return nd_desc->ndctl(nd_desc, NULL, ND_CMD_ARS_CAP, cmd,
1484 sizeof(*cmd));
1485 }
1486
1487 static int ars_do_start(struct nvdimm_bus_descriptor *nd_desc,
1488 struct nd_cmd_ars_start *cmd, u64 addr, u64 length)
1489 {
1490 int rc;
1491
1492 cmd->address = addr;
1493 cmd->length = length;
1494 cmd->type = ND_ARS_PERSISTENT;
1495
1496 while (1) {
1497 rc = nd_desc->ndctl(nd_desc, NULL, ND_CMD_ARS_START, cmd,
1498 sizeof(*cmd));
1499 if (rc)
1500 return rc;
1501 switch (cmd->status) {
1502 case 0:
1503 return 0;
1504 case 1:
1505 /* ARS unsupported, but we should never get here */
1506 return 0;
1507 case 2:
1508 return -EINVAL;
1509 case 3:
1510 /* ARS is in progress */
1511 msleep(1000);
1512 break;
1513 default:
1514 return -ENXIO;
1515 }
1516 }
1517 }
1518
1519 static int ars_get_status(struct nvdimm_bus_descriptor *nd_desc,
1520 struct nd_cmd_ars_status *cmd)
1521 {
1522 int rc;
1523
1524 while (1) {
1525 rc = nd_desc->ndctl(nd_desc, NULL, ND_CMD_ARS_STATUS, cmd,
1526 sizeof(*cmd));
1527 if (rc || cmd->status & 0xffff)
1528 return -ENXIO;
1529
1530 /* Check extended status (Upper two bytes) */
1531 switch (cmd->status >> 16) {
1532 case 0:
1533 return 0;
1534 case 1:
1535 /* ARS is in progress */
1536 msleep(1000);
1537 break;
1538 case 2:
1539 /* No ARS performed for the current boot */
1540 return 0;
1541 default:
1542 return -ENXIO;
1543 }
1544 }
1545 }
1546
1547 static int ars_status_process_records(struct nvdimm_bus *nvdimm_bus,
1548 struct nd_cmd_ars_status *ars_status, u64 start)
1549 {
1550 int rc;
1551 u32 i;
1552
1553 /*
1554 * The address field returned by ars_status should be either
1555 * less than or equal to the address we last started ARS for.
1556 * The (start, length) returned by ars_status should also have
1557 * non-zero overlap with the range we started ARS for.
1558 * If this is not the case, bail.
1559 */
1560 if (ars_status->address > start ||
1561 (ars_status->address + ars_status->length < start))
1562 return -ENXIO;
1563
1564 for (i = 0; i < ars_status->num_records; i++) {
1565 rc = nvdimm_bus_add_poison(nvdimm_bus,
1566 ars_status->records[i].err_address,
1567 ars_status->records[i].length);
1568 if (rc)
1569 return rc;
1570 }
1571
1572 return 0;
1573 }
1574
1575 static int acpi_nfit_find_poison(struct acpi_nfit_desc *acpi_desc,
1576 struct nd_region_desc *ndr_desc)
1577 {
1578 struct nvdimm_bus_descriptor *nd_desc = &acpi_desc->nd_desc;
1579 struct nvdimm_bus *nvdimm_bus = acpi_desc->nvdimm_bus;
1580 struct nd_cmd_ars_status *ars_status = NULL;
1581 struct nd_cmd_ars_start *ars_start = NULL;
1582 struct nd_cmd_ars_cap *ars_cap = NULL;
1583 u64 start, len, cur, remaining;
1584 int rc;
1585
1586 ars_cap = kzalloc(sizeof(*ars_cap), GFP_KERNEL);
1587 if (!ars_cap)
1588 return -ENOMEM;
1589
1590 start = ndr_desc->res->start;
1591 len = ndr_desc->res->end - ndr_desc->res->start + 1;
1592
1593 rc = ars_get_cap(nd_desc, ars_cap, start, len);
1594 if (rc)
1595 goto out;
1596
1597 /*
1598 * If ARS is unsupported, or if the 'Persistent Memory Scrub' flag in
1599 * extended status is not set, skip this but continue initialization
1600 */
1601 if ((ars_cap->status & 0xffff) ||
1602 !(ars_cap->status >> 16 & ND_ARS_PERSISTENT)) {
1603 dev_warn(acpi_desc->dev,
1604 "ARS unsupported (status: 0x%x), won't create an error list\n",
1605 ars_cap->status);
1606 goto out;
1607 }
1608
1609 /*
1610 * Check if a full-range ARS has been run. If so, use those results
1611 * without having to start a new ARS.
1612 */
1613 ars_status = kzalloc(ars_cap->max_ars_out + sizeof(*ars_status),
1614 GFP_KERNEL);
1615 if (!ars_status) {
1616 rc = -ENOMEM;
1617 goto out;
1618 }
1619
1620 rc = ars_get_status(nd_desc, ars_status);
1621 if (rc)
1622 goto out;
1623
1624 if (ars_status->address <= start &&
1625 (ars_status->address + ars_status->length >= start + len)) {
1626 rc = ars_status_process_records(nvdimm_bus, ars_status, start);
1627 goto out;
1628 }
1629
1630 /*
1631 * ARS_STATUS can overflow if the number of poison entries found is
1632 * greater than the maximum buffer size (ars_cap->max_ars_out)
1633 * To detect overflow, check if the length field of ars_status
1634 * is less than the length we supplied. If so, process the
1635 * error entries we got, adjust the start point, and start again
1636 */
1637 ars_start = kzalloc(sizeof(*ars_start), GFP_KERNEL);
1638 if (!ars_start)
1639 return -ENOMEM;
1640
1641 cur = start;
1642 remaining = len;
1643 do {
1644 u64 done, end;
1645
1646 rc = ars_do_start(nd_desc, ars_start, cur, remaining);
1647 if (rc)
1648 goto out;
1649
1650 rc = ars_get_status(nd_desc, ars_status);
1651 if (rc)
1652 goto out;
1653
1654 rc = ars_status_process_records(nvdimm_bus, ars_status, cur);
1655 if (rc)
1656 goto out;
1657
1658 end = min(cur + remaining,
1659 ars_status->address + ars_status->length);
1660 done = end - cur;
1661 cur += done;
1662 remaining -= done;
1663 } while (remaining);
1664
1665 out:
1666 kfree(ars_cap);
1667 kfree(ars_start);
1668 kfree(ars_status);
1669 return rc;
1670 }
1671
1672 static int acpi_nfit_init_mapping(struct acpi_nfit_desc *acpi_desc,
1673 struct nd_mapping *nd_mapping, struct nd_region_desc *ndr_desc,
1674 struct acpi_nfit_memory_map *memdev,
1675 struct acpi_nfit_system_address *spa)
1676 {
1677 struct nvdimm *nvdimm = acpi_nfit_dimm_by_handle(acpi_desc,
1678 memdev->device_handle);
1679 struct nd_blk_region_desc *ndbr_desc;
1680 struct nfit_mem *nfit_mem;
1681 int blk_valid = 0;
1682
1683 if (!nvdimm) {
1684 dev_err(acpi_desc->dev, "spa%d dimm: %#x not found\n",
1685 spa->range_index, memdev->device_handle);
1686 return -ENODEV;
1687 }
1688
1689 nd_mapping->nvdimm = nvdimm;
1690 switch (nfit_spa_type(spa)) {
1691 case NFIT_SPA_PM:
1692 case NFIT_SPA_VOLATILE:
1693 nd_mapping->start = memdev->address;
1694 nd_mapping->size = memdev->region_size;
1695 break;
1696 case NFIT_SPA_DCR:
1697 nfit_mem = nvdimm_provider_data(nvdimm);
1698 if (!nfit_mem || !nfit_mem->bdw) {
1699 dev_dbg(acpi_desc->dev, "spa%d %s missing bdw\n",
1700 spa->range_index, nvdimm_name(nvdimm));
1701 } else {
1702 nd_mapping->size = nfit_mem->bdw->capacity;
1703 nd_mapping->start = nfit_mem->bdw->start_address;
1704 ndr_desc->num_lanes = nfit_mem->bdw->windows;
1705 blk_valid = 1;
1706 }
1707
1708 ndr_desc->nd_mapping = nd_mapping;
1709 ndr_desc->num_mappings = blk_valid;
1710 ndbr_desc = to_blk_region_desc(ndr_desc);
1711 ndbr_desc->enable = acpi_nfit_blk_region_enable;
1712 ndbr_desc->disable = acpi_nfit_blk_region_disable;
1713 ndbr_desc->do_io = acpi_desc->blk_do_io;
1714 if (!nvdimm_blk_region_create(acpi_desc->nvdimm_bus, ndr_desc))
1715 return -ENOMEM;
1716 break;
1717 }
1718
1719 return 0;
1720 }
1721
1722 static int acpi_nfit_register_region(struct acpi_nfit_desc *acpi_desc,
1723 struct nfit_spa *nfit_spa)
1724 {
1725 static struct nd_mapping nd_mappings[ND_MAX_MAPPINGS];
1726 struct acpi_nfit_system_address *spa = nfit_spa->spa;
1727 struct nd_blk_region_desc ndbr_desc;
1728 struct nd_region_desc *ndr_desc;
1729 struct nfit_memdev *nfit_memdev;
1730 struct nvdimm_bus *nvdimm_bus;
1731 struct resource res;
1732 int count = 0, rc;
1733
1734 if (nfit_spa->is_registered)
1735 return 0;
1736
1737 if (spa->range_index == 0) {
1738 dev_dbg(acpi_desc->dev, "%s: detected invalid spa index\n",
1739 __func__);
1740 return 0;
1741 }
1742
1743 memset(&res, 0, sizeof(res));
1744 memset(&nd_mappings, 0, sizeof(nd_mappings));
1745 memset(&ndbr_desc, 0, sizeof(ndbr_desc));
1746 res.start = spa->address;
1747 res.end = res.start + spa->length - 1;
1748 ndr_desc = &ndbr_desc.ndr_desc;
1749 ndr_desc->res = &res;
1750 ndr_desc->provider_data = nfit_spa;
1751 ndr_desc->attr_groups = acpi_nfit_region_attribute_groups;
1752 if (spa->flags & ACPI_NFIT_PROXIMITY_VALID)
1753 ndr_desc->numa_node = acpi_map_pxm_to_online_node(
1754 spa->proximity_domain);
1755 else
1756 ndr_desc->numa_node = NUMA_NO_NODE;
1757
1758 list_for_each_entry(nfit_memdev, &acpi_desc->memdevs, list) {
1759 struct acpi_nfit_memory_map *memdev = nfit_memdev->memdev;
1760 struct nd_mapping *nd_mapping;
1761
1762 if (memdev->range_index != spa->range_index)
1763 continue;
1764 if (count >= ND_MAX_MAPPINGS) {
1765 dev_err(acpi_desc->dev, "spa%d exceeds max mappings %d\n",
1766 spa->range_index, ND_MAX_MAPPINGS);
1767 return -ENXIO;
1768 }
1769 nd_mapping = &nd_mappings[count++];
1770 rc = acpi_nfit_init_mapping(acpi_desc, nd_mapping, ndr_desc,
1771 memdev, spa);
1772 if (rc)
1773 return rc;
1774 }
1775
1776 ndr_desc->nd_mapping = nd_mappings;
1777 ndr_desc->num_mappings = count;
1778 rc = acpi_nfit_init_interleave_set(acpi_desc, ndr_desc, spa);
1779 if (rc)
1780 return rc;
1781
1782 nvdimm_bus = acpi_desc->nvdimm_bus;
1783 if (nfit_spa_type(spa) == NFIT_SPA_PM) {
1784 rc = acpi_nfit_find_poison(acpi_desc, ndr_desc);
1785 if (rc) {
1786 dev_err(acpi_desc->dev,
1787 "error while performing ARS to find poison: %d\n",
1788 rc);
1789 return rc;
1790 }
1791 if (!nvdimm_pmem_region_create(nvdimm_bus, ndr_desc))
1792 return -ENOMEM;
1793 } else if (nfit_spa_type(spa) == NFIT_SPA_VOLATILE) {
1794 if (!nvdimm_volatile_region_create(nvdimm_bus, ndr_desc))
1795 return -ENOMEM;
1796 }
1797
1798 nfit_spa->is_registered = 1;
1799 return 0;
1800 }
1801
1802 static int acpi_nfit_register_regions(struct acpi_nfit_desc *acpi_desc)
1803 {
1804 struct nfit_spa *nfit_spa;
1805
1806 list_for_each_entry(nfit_spa, &acpi_desc->spas, list) {
1807 int rc = acpi_nfit_register_region(acpi_desc, nfit_spa);
1808
1809 if (rc)
1810 return rc;
1811 }
1812 return 0;
1813 }
1814
1815 static int acpi_nfit_check_deletions(struct acpi_nfit_desc *acpi_desc,
1816 struct nfit_table_prev *prev)
1817 {
1818 struct device *dev = acpi_desc->dev;
1819
1820 if (!list_empty(&prev->spas) ||
1821 !list_empty(&prev->memdevs) ||
1822 !list_empty(&prev->dcrs) ||
1823 !list_empty(&prev->bdws) ||
1824 !list_empty(&prev->idts) ||
1825 !list_empty(&prev->flushes)) {
1826 dev_err(dev, "new nfit deletes entries (unsupported)\n");
1827 return -ENXIO;
1828 }
1829 return 0;
1830 }
1831
1832 int acpi_nfit_init(struct acpi_nfit_desc *acpi_desc, acpi_size sz)
1833 {
1834 struct device *dev = acpi_desc->dev;
1835 struct nfit_table_prev prev;
1836 const void *end;
1837 u8 *data;
1838 int rc;
1839
1840 mutex_lock(&acpi_desc->init_mutex);
1841
1842 INIT_LIST_HEAD(&prev.spas);
1843 INIT_LIST_HEAD(&prev.memdevs);
1844 INIT_LIST_HEAD(&prev.dcrs);
1845 INIT_LIST_HEAD(&prev.bdws);
1846 INIT_LIST_HEAD(&prev.idts);
1847 INIT_LIST_HEAD(&prev.flushes);
1848
1849 list_cut_position(&prev.spas, &acpi_desc->spas,
1850 acpi_desc->spas.prev);
1851 list_cut_position(&prev.memdevs, &acpi_desc->memdevs,
1852 acpi_desc->memdevs.prev);
1853 list_cut_position(&prev.dcrs, &acpi_desc->dcrs,
1854 acpi_desc->dcrs.prev);
1855 list_cut_position(&prev.bdws, &acpi_desc->bdws,
1856 acpi_desc->bdws.prev);
1857 list_cut_position(&prev.idts, &acpi_desc->idts,
1858 acpi_desc->idts.prev);
1859 list_cut_position(&prev.flushes, &acpi_desc->flushes,
1860 acpi_desc->flushes.prev);
1861
1862 data = (u8 *) acpi_desc->nfit;
1863 end = data + sz;
1864 while (!IS_ERR_OR_NULL(data))
1865 data = add_table(acpi_desc, &prev, data, end);
1866
1867 if (IS_ERR(data)) {
1868 dev_dbg(dev, "%s: nfit table parsing error: %ld\n", __func__,
1869 PTR_ERR(data));
1870 rc = PTR_ERR(data);
1871 goto out_unlock;
1872 }
1873
1874 rc = acpi_nfit_check_deletions(acpi_desc, &prev);
1875 if (rc)
1876 goto out_unlock;
1877
1878 if (nfit_mem_init(acpi_desc) != 0) {
1879 rc = -ENOMEM;
1880 goto out_unlock;
1881 }
1882
1883 acpi_nfit_init_dsms(acpi_desc);
1884
1885 rc = acpi_nfit_register_dimms(acpi_desc);
1886 if (rc)
1887 goto out_unlock;
1888
1889 rc = acpi_nfit_register_regions(acpi_desc);
1890
1891 out_unlock:
1892 mutex_unlock(&acpi_desc->init_mutex);
1893 return rc;
1894 }
1895 EXPORT_SYMBOL_GPL(acpi_nfit_init);
1896
1897 static struct acpi_nfit_desc *acpi_nfit_desc_init(struct acpi_device *adev)
1898 {
1899 struct nvdimm_bus_descriptor *nd_desc;
1900 struct acpi_nfit_desc *acpi_desc;
1901 struct device *dev = &adev->dev;
1902
1903 acpi_desc = devm_kzalloc(dev, sizeof(*acpi_desc), GFP_KERNEL);
1904 if (!acpi_desc)
1905 return ERR_PTR(-ENOMEM);
1906
1907 dev_set_drvdata(dev, acpi_desc);
1908 acpi_desc->dev = dev;
1909 acpi_desc->blk_do_io = acpi_nfit_blk_region_do_io;
1910 nd_desc = &acpi_desc->nd_desc;
1911 nd_desc->provider_name = "ACPI.NFIT";
1912 nd_desc->ndctl = acpi_nfit_ctl;
1913 nd_desc->attr_groups = acpi_nfit_attribute_groups;
1914
1915 acpi_desc->nvdimm_bus = nvdimm_bus_register(dev, nd_desc);
1916 if (!acpi_desc->nvdimm_bus) {
1917 devm_kfree(dev, acpi_desc);
1918 return ERR_PTR(-ENXIO);
1919 }
1920
1921 INIT_LIST_HEAD(&acpi_desc->spa_maps);
1922 INIT_LIST_HEAD(&acpi_desc->spas);
1923 INIT_LIST_HEAD(&acpi_desc->dcrs);
1924 INIT_LIST_HEAD(&acpi_desc->bdws);
1925 INIT_LIST_HEAD(&acpi_desc->idts);
1926 INIT_LIST_HEAD(&acpi_desc->flushes);
1927 INIT_LIST_HEAD(&acpi_desc->memdevs);
1928 INIT_LIST_HEAD(&acpi_desc->dimms);
1929 mutex_init(&acpi_desc->spa_map_mutex);
1930 mutex_init(&acpi_desc->init_mutex);
1931
1932 return acpi_desc;
1933 }
1934
1935 static int acpi_nfit_add(struct acpi_device *adev)
1936 {
1937 struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL };
1938 struct acpi_nfit_desc *acpi_desc;
1939 struct device *dev = &adev->dev;
1940 struct acpi_table_header *tbl;
1941 acpi_status status = AE_OK;
1942 acpi_size sz;
1943 int rc;
1944
1945 status = acpi_get_table_with_size("NFIT", 0, &tbl, &sz);
1946 if (ACPI_FAILURE(status)) {
1947 /* This is ok, we could have an nvdimm hotplugged later */
1948 dev_dbg(dev, "failed to find NFIT at startup\n");
1949 return 0;
1950 }
1951
1952 acpi_desc = acpi_nfit_desc_init(adev);
1953 if (IS_ERR(acpi_desc)) {
1954 dev_err(dev, "%s: error initializing acpi_desc: %ld\n",
1955 __func__, PTR_ERR(acpi_desc));
1956 return PTR_ERR(acpi_desc);
1957 }
1958
1959 /*
1960 * Save the acpi header for later and then skip it,
1961 * making nfit point to the first nfit table header.
1962 */
1963 acpi_desc->acpi_header = *tbl;
1964 acpi_desc->nfit = (void *) tbl + sizeof(struct acpi_table_nfit);
1965 sz -= sizeof(struct acpi_table_nfit);
1966
1967 /* Evaluate _FIT and override with that if present */
1968 status = acpi_evaluate_object(adev->handle, "_FIT", NULL, &buf);
1969 if (ACPI_SUCCESS(status) && buf.length > 0) {
1970 union acpi_object *obj;
1971 /*
1972 * Adjust for the acpi_object header of the _FIT
1973 */
1974 obj = buf.pointer;
1975 if (obj->type == ACPI_TYPE_BUFFER) {
1976 acpi_desc->nfit =
1977 (struct acpi_nfit_header *)obj->buffer.pointer;
1978 sz = obj->buffer.length;
1979 } else
1980 dev_dbg(dev, "%s invalid type %d, ignoring _FIT\n",
1981 __func__, (int) obj->type);
1982 }
1983
1984 rc = acpi_nfit_init(acpi_desc, sz);
1985 if (rc) {
1986 nvdimm_bus_unregister(acpi_desc->nvdimm_bus);
1987 return rc;
1988 }
1989 return 0;
1990 }
1991
1992 static int acpi_nfit_remove(struct acpi_device *adev)
1993 {
1994 struct acpi_nfit_desc *acpi_desc = dev_get_drvdata(&adev->dev);
1995
1996 nvdimm_bus_unregister(acpi_desc->nvdimm_bus);
1997 return 0;
1998 }
1999
2000 static void acpi_nfit_notify(struct acpi_device *adev, u32 event)
2001 {
2002 struct acpi_nfit_desc *acpi_desc = dev_get_drvdata(&adev->dev);
2003 struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL };
2004 struct acpi_nfit_header *nfit_saved;
2005 union acpi_object *obj;
2006 struct device *dev = &adev->dev;
2007 acpi_status status;
2008 int ret;
2009
2010 dev_dbg(dev, "%s: event: %d\n", __func__, event);
2011
2012 device_lock(dev);
2013 if (!dev->driver) {
2014 /* dev->driver may be null if we're being removed */
2015 dev_dbg(dev, "%s: no driver found for dev\n", __func__);
2016 goto out_unlock;
2017 }
2018
2019 if (!acpi_desc) {
2020 acpi_desc = acpi_nfit_desc_init(adev);
2021 if (IS_ERR(acpi_desc)) {
2022 dev_err(dev, "%s: error initializing acpi_desc: %ld\n",
2023 __func__, PTR_ERR(acpi_desc));
2024 goto out_unlock;
2025 }
2026 }
2027
2028 /* Evaluate _FIT */
2029 status = acpi_evaluate_object(adev->handle, "_FIT", NULL, &buf);
2030 if (ACPI_FAILURE(status)) {
2031 dev_err(dev, "failed to evaluate _FIT\n");
2032 goto out_unlock;
2033 }
2034
2035 nfit_saved = acpi_desc->nfit;
2036 obj = buf.pointer;
2037 if (obj->type == ACPI_TYPE_BUFFER) {
2038 acpi_desc->nfit =
2039 (struct acpi_nfit_header *)obj->buffer.pointer;
2040 ret = acpi_nfit_init(acpi_desc, obj->buffer.length);
2041 if (ret) {
2042 /* Merge failed, restore old nfit, and exit */
2043 acpi_desc->nfit = nfit_saved;
2044 dev_err(dev, "failed to merge updated NFIT\n");
2045 }
2046 } else {
2047 /* Bad _FIT, restore old nfit */
2048 dev_err(dev, "Invalid _FIT\n");
2049 }
2050 kfree(buf.pointer);
2051
2052 out_unlock:
2053 device_unlock(dev);
2054 }
2055
2056 static const struct acpi_device_id acpi_nfit_ids[] = {
2057 { "ACPI0012", 0 },
2058 { "", 0 },
2059 };
2060 MODULE_DEVICE_TABLE(acpi, acpi_nfit_ids);
2061
2062 static struct acpi_driver acpi_nfit_driver = {
2063 .name = KBUILD_MODNAME,
2064 .ids = acpi_nfit_ids,
2065 .ops = {
2066 .add = acpi_nfit_add,
2067 .remove = acpi_nfit_remove,
2068 .notify = acpi_nfit_notify,
2069 },
2070 };
2071
2072 static __init int nfit_init(void)
2073 {
2074 BUILD_BUG_ON(sizeof(struct acpi_table_nfit) != 40);
2075 BUILD_BUG_ON(sizeof(struct acpi_nfit_system_address) != 56);
2076 BUILD_BUG_ON(sizeof(struct acpi_nfit_memory_map) != 48);
2077 BUILD_BUG_ON(sizeof(struct acpi_nfit_interleave) != 20);
2078 BUILD_BUG_ON(sizeof(struct acpi_nfit_smbios) != 9);
2079 BUILD_BUG_ON(sizeof(struct acpi_nfit_control_region) != 80);
2080 BUILD_BUG_ON(sizeof(struct acpi_nfit_data_region) != 40);
2081
2082 acpi_str_to_uuid(UUID_VOLATILE_MEMORY, nfit_uuid[NFIT_SPA_VOLATILE]);
2083 acpi_str_to_uuid(UUID_PERSISTENT_MEMORY, nfit_uuid[NFIT_SPA_PM]);
2084 acpi_str_to_uuid(UUID_CONTROL_REGION, nfit_uuid[NFIT_SPA_DCR]);
2085 acpi_str_to_uuid(UUID_DATA_REGION, nfit_uuid[NFIT_SPA_BDW]);
2086 acpi_str_to_uuid(UUID_VOLATILE_VIRTUAL_DISK, nfit_uuid[NFIT_SPA_VDISK]);
2087 acpi_str_to_uuid(UUID_VOLATILE_VIRTUAL_CD, nfit_uuid[NFIT_SPA_VCD]);
2088 acpi_str_to_uuid(UUID_PERSISTENT_VIRTUAL_DISK, nfit_uuid[NFIT_SPA_PDISK]);
2089 acpi_str_to_uuid(UUID_PERSISTENT_VIRTUAL_CD, nfit_uuid[NFIT_SPA_PCD]);
2090 acpi_str_to_uuid(UUID_NFIT_BUS, nfit_uuid[NFIT_DEV_BUS]);
2091 acpi_str_to_uuid(UUID_NFIT_DIMM, nfit_uuid[NFIT_DEV_DIMM]);
2092
2093 return acpi_bus_register_driver(&acpi_nfit_driver);
2094 }
2095
2096 static __exit void nfit_exit(void)
2097 {
2098 acpi_bus_unregister_driver(&acpi_nfit_driver);
2099 }
2100
2101 module_init(nfit_init);
2102 module_exit(nfit_exit);
2103 MODULE_LICENSE("GPL v2");
2104 MODULE_AUTHOR("Intel Corporation");
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