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