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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 <linux/nd.h>
25#include <asm/cacheflush.h>
26#include "nfit.h"
27
28/*
29 * For readq() and writeq() on 32-bit builds, the hi-lo, lo-hi order is
30 * irrelevant.
31 */
32#include <linux/io-64-nonatomic-hi-lo.h>
33
34static bool force_enable_dimms;
35module_param(force_enable_dimms, bool, S_IRUGO|S_IWUSR);
36MODULE_PARM_DESC(force_enable_dimms, "Ignore _STA (ACPI DIMM device) status");
37
38static unsigned int scrub_timeout = NFIT_ARS_TIMEOUT;
39module_param(scrub_timeout, uint, S_IRUGO|S_IWUSR);
40MODULE_PARM_DESC(scrub_timeout, "Initial scrub timeout in seconds");
41
42/* after three payloads of overflow, it's dead jim */
43static unsigned int scrub_overflow_abort = 3;
44module_param(scrub_overflow_abort, uint, S_IRUGO|S_IWUSR);
45MODULE_PARM_DESC(scrub_overflow_abort,
46 "Number of times we overflow ARS results before abort");
47
48static struct workqueue_struct *nfit_wq;
49
50struct nfit_table_prev {
51 struct list_head spas;
52 struct list_head memdevs;
53 struct list_head dcrs;
54 struct list_head bdws;
55 struct list_head idts;
56 struct list_head flushes;
57};
58
59static u8 nfit_uuid[NFIT_UUID_MAX][16];
60
61const u8 *to_nfit_uuid(enum nfit_uuids id)
62{
63 return nfit_uuid[id];
64}
65EXPORT_SYMBOL(to_nfit_uuid);
66
67static struct acpi_nfit_desc *to_acpi_nfit_desc(
68 struct nvdimm_bus_descriptor *nd_desc)
69{
70 return container_of(nd_desc, struct acpi_nfit_desc, nd_desc);
71}
72
73static struct acpi_device *to_acpi_dev(struct acpi_nfit_desc *acpi_desc)
74{
75 struct nvdimm_bus_descriptor *nd_desc = &acpi_desc->nd_desc;
76
77 /*
78 * If provider == 'ACPI.NFIT' we can assume 'dev' is a struct
79 * acpi_device.
80 */
81 if (!nd_desc->provider_name
82 || strcmp(nd_desc->provider_name, "ACPI.NFIT") != 0)
83 return NULL;
84
85 return to_acpi_device(acpi_desc->dev);
86}
87
88static int xlat_status(void *buf, unsigned int cmd)
89{
90 struct nd_cmd_clear_error *clear_err;
91 struct nd_cmd_ars_status *ars_status;
92 struct nd_cmd_ars_start *ars_start;
93 struct nd_cmd_ars_cap *ars_cap;
94 u16 flags;
95
96 switch (cmd) {
97 case ND_CMD_ARS_CAP:
98 ars_cap = buf;
99 if ((ars_cap->status & 0xffff) == NFIT_ARS_CAP_NONE)
100 return -ENOTTY;
101
102 /* Command failed */
103 if (ars_cap->status & 0xffff)
104 return -EIO;
105
106 /* No supported scan types for this range */
107 flags = ND_ARS_PERSISTENT | ND_ARS_VOLATILE;
108 if ((ars_cap->status >> 16 & flags) == 0)
109 return -ENOTTY;
110 break;
111 case ND_CMD_ARS_START:
112 ars_start = buf;
113 /* ARS is in progress */
114 if ((ars_start->status & 0xffff) == NFIT_ARS_START_BUSY)
115 return -EBUSY;
116
117 /* Command failed */
118 if (ars_start->status & 0xffff)
119 return -EIO;
120 break;
121 case ND_CMD_ARS_STATUS:
122 ars_status = buf;
123 /* Command failed */
124 if (ars_status->status & 0xffff)
125 return -EIO;
126 /* Check extended status (Upper two bytes) */
127 if (ars_status->status == NFIT_ARS_STATUS_DONE)
128 return 0;
129
130 /* ARS is in progress */
131 if (ars_status->status == NFIT_ARS_STATUS_BUSY)
132 return -EBUSY;
133
134 /* No ARS performed for the current boot */
135 if (ars_status->status == NFIT_ARS_STATUS_NONE)
136 return -EAGAIN;
137
138 /*
139 * ARS interrupted, either we overflowed or some other
140 * agent wants the scan to stop. If we didn't overflow
141 * then just continue with the returned results.
142 */
143 if (ars_status->status == NFIT_ARS_STATUS_INTR) {
144 if (ars_status->flags & NFIT_ARS_F_OVERFLOW)
145 return -ENOSPC;
146 return 0;
147 }
148
149 /* Unknown status */
150 if (ars_status->status >> 16)
151 return -EIO;
152 break;
153 case ND_CMD_CLEAR_ERROR:
154 clear_err = buf;
155 if (clear_err->status & 0xffff)
156 return -EIO;
157 if (!clear_err->cleared)
158 return -EIO;
159 if (clear_err->length > clear_err->cleared)
160 return clear_err->cleared;
161 break;
162 default:
163 break;
164 }
165
166 return 0;
167}
168
169static int acpi_nfit_ctl(struct nvdimm_bus_descriptor *nd_desc,
170 struct nvdimm *nvdimm, unsigned int cmd, void *buf,
171 unsigned int buf_len, int *cmd_rc)
172{
173 struct acpi_nfit_desc *acpi_desc = to_acpi_nfit_desc(nd_desc);
174 const struct nd_cmd_desc *desc = NULL;
175 union acpi_object in_obj, in_buf, *out_obj;
176 struct device *dev = acpi_desc->dev;
177 const char *cmd_name, *dimm_name;
178 unsigned long dsm_mask;
179 acpi_handle handle;
180 const u8 *uuid;
181 u32 offset;
182 int rc, i;
183
184 if (nvdimm) {
185 struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
186 struct acpi_device *adev = nfit_mem->adev;
187
188 if (!adev)
189 return -ENOTTY;
190 dimm_name = nvdimm_name(nvdimm);
191 cmd_name = nvdimm_cmd_name(cmd);
192 dsm_mask = nfit_mem->dsm_mask;
193 desc = nd_cmd_dimm_desc(cmd);
194 uuid = to_nfit_uuid(NFIT_DEV_DIMM);
195 handle = adev->handle;
196 } else {
197 struct acpi_device *adev = to_acpi_dev(acpi_desc);
198
199 cmd_name = nvdimm_bus_cmd_name(cmd);
200 dsm_mask = nd_desc->dsm_mask;
201 desc = nd_cmd_bus_desc(cmd);
202 uuid = to_nfit_uuid(NFIT_DEV_BUS);
203 handle = adev->handle;
204 dimm_name = "bus";
205 }
206
207 if (!desc || (cmd && (desc->out_num + desc->in_num == 0)))
208 return -ENOTTY;
209
210 if (!test_bit(cmd, &dsm_mask))
211 return -ENOTTY;
212
213 in_obj.type = ACPI_TYPE_PACKAGE;
214 in_obj.package.count = 1;
215 in_obj.package.elements = &in_buf;
216 in_buf.type = ACPI_TYPE_BUFFER;
217 in_buf.buffer.pointer = buf;
218 in_buf.buffer.length = 0;
219
220 /* libnvdimm has already validated the input envelope */
221 for (i = 0; i < desc->in_num; i++)
222 in_buf.buffer.length += nd_cmd_in_size(nvdimm, cmd, desc,
223 i, buf);
224
225 if (IS_ENABLED(CONFIG_ACPI_NFIT_DEBUG)) {
226 dev_dbg(dev, "%s:%s cmd: %s input length: %d\n", __func__,
227 dimm_name, cmd_name, in_buf.buffer.length);
228 print_hex_dump_debug(cmd_name, DUMP_PREFIX_OFFSET, 4,
229 4, in_buf.buffer.pointer, min_t(u32, 128,
230 in_buf.buffer.length), true);
231 }
232
233 out_obj = acpi_evaluate_dsm(handle, uuid, 1, cmd, &in_obj);
234 if (!out_obj) {
235 dev_dbg(dev, "%s:%s _DSM failed cmd: %s\n", __func__, dimm_name,
236 cmd_name);
237 return -EINVAL;
238 }
239
240 if (out_obj->package.type != ACPI_TYPE_BUFFER) {
241 dev_dbg(dev, "%s:%s unexpected output object type cmd: %s type: %d\n",
242 __func__, dimm_name, cmd_name, out_obj->type);
243 rc = -EINVAL;
244 goto out;
245 }
246
247 if (IS_ENABLED(CONFIG_ACPI_NFIT_DEBUG)) {
248 dev_dbg(dev, "%s:%s cmd: %s output length: %d\n", __func__,
249 dimm_name, cmd_name, out_obj->buffer.length);
250 print_hex_dump_debug(cmd_name, DUMP_PREFIX_OFFSET, 4,
251 4, out_obj->buffer.pointer, min_t(u32, 128,
252 out_obj->buffer.length), true);
253 }
254
255 for (i = 0, offset = 0; i < desc->out_num; i++) {
256 u32 out_size = nd_cmd_out_size(nvdimm, cmd, desc, i, buf,
257 (u32 *) out_obj->buffer.pointer);
258
259 if (offset + out_size > out_obj->buffer.length) {
260 dev_dbg(dev, "%s:%s output object underflow cmd: %s field: %d\n",
261 __func__, dimm_name, cmd_name, i);
262 break;
263 }
264
265 if (in_buf.buffer.length + offset + out_size > buf_len) {
266 dev_dbg(dev, "%s:%s output overrun cmd: %s field: %d\n",
267 __func__, dimm_name, cmd_name, i);
268 rc = -ENXIO;
269 goto out;
270 }
271 memcpy(buf + in_buf.buffer.length + offset,
272 out_obj->buffer.pointer + offset, out_size);
273 offset += out_size;
274 }
275 if (offset + in_buf.buffer.length < buf_len) {
276 if (i >= 1) {
277 /*
278 * status valid, return the number of bytes left
279 * unfilled in the output buffer
280 */
281 rc = buf_len - offset - in_buf.buffer.length;
282 if (cmd_rc)
283 *cmd_rc = xlat_status(buf, cmd);
284 } else {
285 dev_err(dev, "%s:%s underrun cmd: %s buf_len: %d out_len: %d\n",
286 __func__, dimm_name, cmd_name, buf_len,
287 offset);
288 rc = -ENXIO;
289 }
290 } else {
291 rc = 0;
292 if (cmd_rc)
293 *cmd_rc = xlat_status(buf, cmd);
294 }
295
296 out:
297 ACPI_FREE(out_obj);
298
299 return rc;
300}
301
302static const char *spa_type_name(u16 type)
303{
304 static const char *to_name[] = {
305 [NFIT_SPA_VOLATILE] = "volatile",
306 [NFIT_SPA_PM] = "pmem",
307 [NFIT_SPA_DCR] = "dimm-control-region",
308 [NFIT_SPA_BDW] = "block-data-window",
309 [NFIT_SPA_VDISK] = "volatile-disk",
310 [NFIT_SPA_VCD] = "volatile-cd",
311 [NFIT_SPA_PDISK] = "persistent-disk",
312 [NFIT_SPA_PCD] = "persistent-cd",
313
314 };
315
316 if (type > NFIT_SPA_PCD)
317 return "unknown";
318
319 return to_name[type];
320}
321
322static int nfit_spa_type(struct acpi_nfit_system_address *spa)
323{
324 int i;
325
326 for (i = 0; i < NFIT_UUID_MAX; i++)
327 if (memcmp(to_nfit_uuid(i), spa->range_guid, 16) == 0)
328 return i;
329 return -1;
330}
331
332static bool add_spa(struct acpi_nfit_desc *acpi_desc,
333 struct nfit_table_prev *prev,
334 struct acpi_nfit_system_address *spa)
335{
336 size_t length = min_t(size_t, sizeof(*spa), spa->header.length);
337 struct device *dev = acpi_desc->dev;
338 struct nfit_spa *nfit_spa;
339
340 list_for_each_entry(nfit_spa, &prev->spas, list) {
341 if (memcmp(nfit_spa->spa, spa, length) == 0) {
342 list_move_tail(&nfit_spa->list, &acpi_desc->spas);
343 return true;
344 }
345 }
346
347 nfit_spa = devm_kzalloc(dev, sizeof(*nfit_spa), GFP_KERNEL);
348 if (!nfit_spa)
349 return false;
350 INIT_LIST_HEAD(&nfit_spa->list);
351 nfit_spa->spa = spa;
352 list_add_tail(&nfit_spa->list, &acpi_desc->spas);
353 dev_dbg(dev, "%s: spa index: %d type: %s\n", __func__,
354 spa->range_index,
355 spa_type_name(nfit_spa_type(spa)));
356 return true;
357}
358
359static bool add_memdev(struct acpi_nfit_desc *acpi_desc,
360 struct nfit_table_prev *prev,
361 struct acpi_nfit_memory_map *memdev)
362{
363 size_t length = min_t(size_t, sizeof(*memdev), memdev->header.length);
364 struct device *dev = acpi_desc->dev;
365 struct nfit_memdev *nfit_memdev;
366
367 list_for_each_entry(nfit_memdev, &prev->memdevs, list)
368 if (memcmp(nfit_memdev->memdev, memdev, length) == 0) {
369 list_move_tail(&nfit_memdev->list, &acpi_desc->memdevs);
370 return true;
371 }
372
373 nfit_memdev = devm_kzalloc(dev, sizeof(*nfit_memdev), GFP_KERNEL);
374 if (!nfit_memdev)
375 return false;
376 INIT_LIST_HEAD(&nfit_memdev->list);
377 nfit_memdev->memdev = memdev;
378 list_add_tail(&nfit_memdev->list, &acpi_desc->memdevs);
379 dev_dbg(dev, "%s: memdev handle: %#x spa: %d dcr: %d\n",
380 __func__, memdev->device_handle, memdev->range_index,
381 memdev->region_index);
382 return true;
383}
384
385static bool add_dcr(struct acpi_nfit_desc *acpi_desc,
386 struct nfit_table_prev *prev,
387 struct acpi_nfit_control_region *dcr)
388{
389 size_t length = min_t(size_t, sizeof(*dcr), dcr->header.length);
390 struct device *dev = acpi_desc->dev;
391 struct nfit_dcr *nfit_dcr;
392
393 list_for_each_entry(nfit_dcr, &prev->dcrs, list)
394 if (memcmp(nfit_dcr->dcr, dcr, length) == 0) {
395 list_move_tail(&nfit_dcr->list, &acpi_desc->dcrs);
396 return true;
397 }
398
399 nfit_dcr = devm_kzalloc(dev, sizeof(*nfit_dcr), GFP_KERNEL);
400 if (!nfit_dcr)
401 return false;
402 INIT_LIST_HEAD(&nfit_dcr->list);
403 nfit_dcr->dcr = dcr;
404 list_add_tail(&nfit_dcr->list, &acpi_desc->dcrs);
405 dev_dbg(dev, "%s: dcr index: %d windows: %d\n", __func__,
406 dcr->region_index, dcr->windows);
407 return true;
408}
409
410static bool add_bdw(struct acpi_nfit_desc *acpi_desc,
411 struct nfit_table_prev *prev,
412 struct acpi_nfit_data_region *bdw)
413{
414 size_t length = min_t(size_t, sizeof(*bdw), bdw->header.length);
415 struct device *dev = acpi_desc->dev;
416 struct nfit_bdw *nfit_bdw;
417
418 list_for_each_entry(nfit_bdw, &prev->bdws, list)
419 if (memcmp(nfit_bdw->bdw, bdw, length) == 0) {
420 list_move_tail(&nfit_bdw->list, &acpi_desc->bdws);
421 return true;
422 }
423
424 nfit_bdw = devm_kzalloc(dev, sizeof(*nfit_bdw), GFP_KERNEL);
425 if (!nfit_bdw)
426 return false;
427 INIT_LIST_HEAD(&nfit_bdw->list);
428 nfit_bdw->bdw = bdw;
429 list_add_tail(&nfit_bdw->list, &acpi_desc->bdws);
430 dev_dbg(dev, "%s: bdw dcr: %d windows: %d\n", __func__,
431 bdw->region_index, bdw->windows);
432 return true;
433}
434
435static bool add_idt(struct acpi_nfit_desc *acpi_desc,
436 struct nfit_table_prev *prev,
437 struct acpi_nfit_interleave *idt)
438{
439 size_t length = min_t(size_t, sizeof(*idt), idt->header.length);
440 struct device *dev = acpi_desc->dev;
441 struct nfit_idt *nfit_idt;
442
443 list_for_each_entry(nfit_idt, &prev->idts, list)
444 if (memcmp(nfit_idt->idt, idt, length) == 0) {
445 list_move_tail(&nfit_idt->list, &acpi_desc->idts);
446 return true;
447 }
448
449 nfit_idt = devm_kzalloc(dev, sizeof(*nfit_idt), GFP_KERNEL);
450 if (!nfit_idt)
451 return false;
452 INIT_LIST_HEAD(&nfit_idt->list);
453 nfit_idt->idt = idt;
454 list_add_tail(&nfit_idt->list, &acpi_desc->idts);
455 dev_dbg(dev, "%s: idt index: %d num_lines: %d\n", __func__,
456 idt->interleave_index, idt->line_count);
457 return true;
458}
459
460static bool add_flush(struct acpi_nfit_desc *acpi_desc,
461 struct nfit_table_prev *prev,
462 struct acpi_nfit_flush_address *flush)
463{
464 size_t length = min_t(size_t, sizeof(*flush), flush->header.length);
465 struct device *dev = acpi_desc->dev;
466 struct nfit_flush *nfit_flush;
467
468 list_for_each_entry(nfit_flush, &prev->flushes, list)
469 if (memcmp(nfit_flush->flush, flush, length) == 0) {
470 list_move_tail(&nfit_flush->list, &acpi_desc->flushes);
471 return true;
472 }
473
474 nfit_flush = devm_kzalloc(dev, sizeof(*nfit_flush), GFP_KERNEL);
475 if (!nfit_flush)
476 return false;
477 INIT_LIST_HEAD(&nfit_flush->list);
478 nfit_flush->flush = flush;
479 list_add_tail(&nfit_flush->list, &acpi_desc->flushes);
480 dev_dbg(dev, "%s: nfit_flush handle: %d hint_count: %d\n", __func__,
481 flush->device_handle, flush->hint_count);
482 return true;
483}
484
485static void *add_table(struct acpi_nfit_desc *acpi_desc,
486 struct nfit_table_prev *prev, void *table, const void *end)
487{
488 struct device *dev = acpi_desc->dev;
489 struct acpi_nfit_header *hdr;
490 void *err = ERR_PTR(-ENOMEM);
491
492 if (table >= end)
493 return NULL;
494
495 hdr = table;
496 if (!hdr->length) {
497 dev_warn(dev, "found a zero length table '%d' parsing nfit\n",
498 hdr->type);
499 return NULL;
500 }
501
502 switch (hdr->type) {
503 case ACPI_NFIT_TYPE_SYSTEM_ADDRESS:
504 if (!add_spa(acpi_desc, prev, table))
505 return err;
506 break;
507 case ACPI_NFIT_TYPE_MEMORY_MAP:
508 if (!add_memdev(acpi_desc, prev, table))
509 return err;
510 break;
511 case ACPI_NFIT_TYPE_CONTROL_REGION:
512 if (!add_dcr(acpi_desc, prev, table))
513 return err;
514 break;
515 case ACPI_NFIT_TYPE_DATA_REGION:
516 if (!add_bdw(acpi_desc, prev, table))
517 return err;
518 break;
519 case ACPI_NFIT_TYPE_INTERLEAVE:
520 if (!add_idt(acpi_desc, prev, table))
521 return err;
522 break;
523 case ACPI_NFIT_TYPE_FLUSH_ADDRESS:
524 if (!add_flush(acpi_desc, prev, table))
525 return err;
526 break;
527 case ACPI_NFIT_TYPE_SMBIOS:
528 dev_dbg(dev, "%s: smbios\n", __func__);
529 break;
530 default:
531 dev_err(dev, "unknown table '%d' parsing nfit\n", hdr->type);
532 break;
533 }
534
535 return table + hdr->length;
536}
537
538static void nfit_mem_find_spa_bdw(struct acpi_nfit_desc *acpi_desc,
539 struct nfit_mem *nfit_mem)
540{
541 u32 device_handle = __to_nfit_memdev(nfit_mem)->device_handle;
542 u16 dcr = nfit_mem->dcr->region_index;
543 struct nfit_spa *nfit_spa;
544
545 list_for_each_entry(nfit_spa, &acpi_desc->spas, list) {
546 u16 range_index = nfit_spa->spa->range_index;
547 int type = nfit_spa_type(nfit_spa->spa);
548 struct nfit_memdev *nfit_memdev;
549
550 if (type != NFIT_SPA_BDW)
551 continue;
552
553 list_for_each_entry(nfit_memdev, &acpi_desc->memdevs, list) {
554 if (nfit_memdev->memdev->range_index != range_index)
555 continue;
556 if (nfit_memdev->memdev->device_handle != device_handle)
557 continue;
558 if (nfit_memdev->memdev->region_index != dcr)
559 continue;
560
561 nfit_mem->spa_bdw = nfit_spa->spa;
562 return;
563 }
564 }
565
566 dev_dbg(acpi_desc->dev, "SPA-BDW not found for SPA-DCR %d\n",
567 nfit_mem->spa_dcr->range_index);
568 nfit_mem->bdw = NULL;
569}
570
571static void nfit_mem_init_bdw(struct acpi_nfit_desc *acpi_desc,
572 struct nfit_mem *nfit_mem, struct acpi_nfit_system_address *spa)
573{
574 u16 dcr = __to_nfit_memdev(nfit_mem)->region_index;
575 struct nfit_memdev *nfit_memdev;
576 struct nfit_flush *nfit_flush;
577 struct nfit_bdw *nfit_bdw;
578 struct nfit_idt *nfit_idt;
579 u16 idt_idx, range_index;
580
581 list_for_each_entry(nfit_bdw, &acpi_desc->bdws, list) {
582 if (nfit_bdw->bdw->region_index != dcr)
583 continue;
584 nfit_mem->bdw = nfit_bdw->bdw;
585 break;
586 }
587
588 if (!nfit_mem->bdw)
589 return;
590
591 nfit_mem_find_spa_bdw(acpi_desc, nfit_mem);
592
593 if (!nfit_mem->spa_bdw)
594 return;
595
596 range_index = nfit_mem->spa_bdw->range_index;
597 list_for_each_entry(nfit_memdev, &acpi_desc->memdevs, list) {
598 if (nfit_memdev->memdev->range_index != range_index ||
599 nfit_memdev->memdev->region_index != dcr)
600 continue;
601 nfit_mem->memdev_bdw = nfit_memdev->memdev;
602 idt_idx = nfit_memdev->memdev->interleave_index;
603 list_for_each_entry(nfit_idt, &acpi_desc->idts, list) {
604 if (nfit_idt->idt->interleave_index != idt_idx)
605 continue;
606 nfit_mem->idt_bdw = nfit_idt->idt;
607 break;
608 }
609
610 list_for_each_entry(nfit_flush, &acpi_desc->flushes, list) {
611 if (nfit_flush->flush->device_handle !=
612 nfit_memdev->memdev->device_handle)
613 continue;
614 nfit_mem->nfit_flush = nfit_flush;
615 break;
616 }
617 break;
618 }
619}
620
621static int nfit_mem_dcr_init(struct acpi_nfit_desc *acpi_desc,
622 struct acpi_nfit_system_address *spa)
623{
624 struct nfit_mem *nfit_mem, *found;
625 struct nfit_memdev *nfit_memdev;
626 int type = nfit_spa_type(spa);
627
628 switch (type) {
629 case NFIT_SPA_DCR:
630 case NFIT_SPA_PM:
631 break;
632 default:
633 return 0;
634 }
635
636 list_for_each_entry(nfit_memdev, &acpi_desc->memdevs, list) {
637 struct nfit_dcr *nfit_dcr;
638 u32 device_handle;
639 u16 dcr;
640
641 if (nfit_memdev->memdev->range_index != spa->range_index)
642 continue;
643 found = NULL;
644 dcr = nfit_memdev->memdev->region_index;
645 device_handle = nfit_memdev->memdev->device_handle;
646 list_for_each_entry(nfit_mem, &acpi_desc->dimms, list)
647 if (__to_nfit_memdev(nfit_mem)->device_handle
648 == device_handle) {
649 found = nfit_mem;
650 break;
651 }
652
653 if (found)
654 nfit_mem = found;
655 else {
656 nfit_mem = devm_kzalloc(acpi_desc->dev,
657 sizeof(*nfit_mem), GFP_KERNEL);
658 if (!nfit_mem)
659 return -ENOMEM;
660 INIT_LIST_HEAD(&nfit_mem->list);
661 list_add(&nfit_mem->list, &acpi_desc->dimms);
662 }
663
664 list_for_each_entry(nfit_dcr, &acpi_desc->dcrs, list) {
665 if (nfit_dcr->dcr->region_index != dcr)
666 continue;
667 /*
668 * Record the control region for the dimm. For
669 * the ACPI 6.1 case, where there are separate
670 * control regions for the pmem vs blk
671 * interfaces, be sure to record the extended
672 * blk details.
673 */
674 if (!nfit_mem->dcr)
675 nfit_mem->dcr = nfit_dcr->dcr;
676 else if (nfit_mem->dcr->windows == 0
677 && nfit_dcr->dcr->windows)
678 nfit_mem->dcr = nfit_dcr->dcr;
679 break;
680 }
681
682 if (dcr && !nfit_mem->dcr) {
683 dev_err(acpi_desc->dev, "SPA %d missing DCR %d\n",
684 spa->range_index, dcr);
685 return -ENODEV;
686 }
687
688 if (type == NFIT_SPA_DCR) {
689 struct nfit_idt *nfit_idt;
690 u16 idt_idx;
691
692 /* multiple dimms may share a SPA when interleaved */
693 nfit_mem->spa_dcr = spa;
694 nfit_mem->memdev_dcr = nfit_memdev->memdev;
695 idt_idx = nfit_memdev->memdev->interleave_index;
696 list_for_each_entry(nfit_idt, &acpi_desc->idts, list) {
697 if (nfit_idt->idt->interleave_index != idt_idx)
698 continue;
699 nfit_mem->idt_dcr = nfit_idt->idt;
700 break;
701 }
702 nfit_mem_init_bdw(acpi_desc, nfit_mem, spa);
703 } else {
704 /*
705 * A single dimm may belong to multiple SPA-PM
706 * ranges, record at least one in addition to
707 * any SPA-DCR range.
708 */
709 nfit_mem->memdev_pmem = nfit_memdev->memdev;
710 }
711 }
712
713 return 0;
714}
715
716static int nfit_mem_cmp(void *priv, struct list_head *_a, struct list_head *_b)
717{
718 struct nfit_mem *a = container_of(_a, typeof(*a), list);
719 struct nfit_mem *b = container_of(_b, typeof(*b), list);
720 u32 handleA, handleB;
721
722 handleA = __to_nfit_memdev(a)->device_handle;
723 handleB = __to_nfit_memdev(b)->device_handle;
724 if (handleA < handleB)
725 return -1;
726 else if (handleA > handleB)
727 return 1;
728 return 0;
729}
730
731static int nfit_mem_init(struct acpi_nfit_desc *acpi_desc)
732{
733 struct nfit_spa *nfit_spa;
734
735 /*
736 * For each SPA-DCR or SPA-PMEM address range find its
737 * corresponding MEMDEV(s). From each MEMDEV find the
738 * corresponding DCR. Then, if we're operating on a SPA-DCR,
739 * try to find a SPA-BDW and a corresponding BDW that references
740 * the DCR. Throw it all into an nfit_mem object. Note, that
741 * BDWs are optional.
742 */
743 list_for_each_entry(nfit_spa, &acpi_desc->spas, list) {
744 int rc;
745
746 rc = nfit_mem_dcr_init(acpi_desc, nfit_spa->spa);
747 if (rc)
748 return rc;
749 }
750
751 list_sort(NULL, &acpi_desc->dimms, nfit_mem_cmp);
752
753 return 0;
754}
755
756static ssize_t revision_show(struct device *dev,
757 struct device_attribute *attr, char *buf)
758{
759 struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev);
760 struct nvdimm_bus_descriptor *nd_desc = to_nd_desc(nvdimm_bus);
761 struct acpi_nfit_desc *acpi_desc = to_acpi_desc(nd_desc);
762
763 return sprintf(buf, "%d\n", acpi_desc->acpi_header.revision);
764}
765static DEVICE_ATTR_RO(revision);
766
767static struct attribute *acpi_nfit_attributes[] = {
768 &dev_attr_revision.attr,
769 NULL,
770};
771
772static struct attribute_group acpi_nfit_attribute_group = {
773 .name = "nfit",
774 .attrs = acpi_nfit_attributes,
775};
776
777static const struct attribute_group *acpi_nfit_attribute_groups[] = {
778 &nvdimm_bus_attribute_group,
779 &acpi_nfit_attribute_group,
780 NULL,
781};
782
783static struct acpi_nfit_memory_map *to_nfit_memdev(struct device *dev)
784{
785 struct nvdimm *nvdimm = to_nvdimm(dev);
786 struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
787
788 return __to_nfit_memdev(nfit_mem);
789}
790
791static struct acpi_nfit_control_region *to_nfit_dcr(struct device *dev)
792{
793 struct nvdimm *nvdimm = to_nvdimm(dev);
794 struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
795
796 return nfit_mem->dcr;
797}
798
799static ssize_t handle_show(struct device *dev,
800 struct device_attribute *attr, char *buf)
801{
802 struct acpi_nfit_memory_map *memdev = to_nfit_memdev(dev);
803
804 return sprintf(buf, "%#x\n", memdev->device_handle);
805}
806static DEVICE_ATTR_RO(handle);
807
808static ssize_t phys_id_show(struct device *dev,
809 struct device_attribute *attr, char *buf)
810{
811 struct acpi_nfit_memory_map *memdev = to_nfit_memdev(dev);
812
813 return sprintf(buf, "%#x\n", memdev->physical_id);
814}
815static DEVICE_ATTR_RO(phys_id);
816
817static ssize_t vendor_show(struct device *dev,
818 struct device_attribute *attr, char *buf)
819{
820 struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev);
821
822 return sprintf(buf, "%#x\n", dcr->vendor_id);
823}
824static DEVICE_ATTR_RO(vendor);
825
826static ssize_t rev_id_show(struct device *dev,
827 struct device_attribute *attr, char *buf)
828{
829 struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev);
830
831 return sprintf(buf, "%#x\n", dcr->revision_id);
832}
833static DEVICE_ATTR_RO(rev_id);
834
835static ssize_t device_show(struct device *dev,
836 struct device_attribute *attr, char *buf)
837{
838 struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev);
839
840 return sprintf(buf, "%#x\n", dcr->device_id);
841}
842static DEVICE_ATTR_RO(device);
843
844static ssize_t format_show(struct device *dev,
845 struct device_attribute *attr, char *buf)
846{
847 struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev);
848
849 return sprintf(buf, "%#x\n", dcr->code);
850}
851static DEVICE_ATTR_RO(format);
852
853static ssize_t serial_show(struct device *dev,
854 struct device_attribute *attr, char *buf)
855{
856 struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev);
857
858 return sprintf(buf, "%#x\n", dcr->serial_number);
859}
860static DEVICE_ATTR_RO(serial);
861
862static ssize_t flags_show(struct device *dev,
863 struct device_attribute *attr, char *buf)
864{
865 u16 flags = to_nfit_memdev(dev)->flags;
866
867 return sprintf(buf, "%s%s%s%s%s\n",
868 flags & ACPI_NFIT_MEM_SAVE_FAILED ? "save_fail " : "",
869 flags & ACPI_NFIT_MEM_RESTORE_FAILED ? "restore_fail " : "",
870 flags & ACPI_NFIT_MEM_FLUSH_FAILED ? "flush_fail " : "",
871 flags & ACPI_NFIT_MEM_NOT_ARMED ? "not_armed " : "",
872 flags & ACPI_NFIT_MEM_HEALTH_OBSERVED ? "smart_event " : "");
873}
874static DEVICE_ATTR_RO(flags);
875
876static struct attribute *acpi_nfit_dimm_attributes[] = {
877 &dev_attr_handle.attr,
878 &dev_attr_phys_id.attr,
879 &dev_attr_vendor.attr,
880 &dev_attr_device.attr,
881 &dev_attr_format.attr,
882 &dev_attr_serial.attr,
883 &dev_attr_rev_id.attr,
884 &dev_attr_flags.attr,
885 NULL,
886};
887
888static umode_t acpi_nfit_dimm_attr_visible(struct kobject *kobj,
889 struct attribute *a, int n)
890{
891 struct device *dev = container_of(kobj, struct device, kobj);
892
893 if (to_nfit_dcr(dev))
894 return a->mode;
895 else
896 return 0;
897}
898
899static struct attribute_group acpi_nfit_dimm_attribute_group = {
900 .name = "nfit",
901 .attrs = acpi_nfit_dimm_attributes,
902 .is_visible = acpi_nfit_dimm_attr_visible,
903};
904
905static const struct attribute_group *acpi_nfit_dimm_attribute_groups[] = {
906 &nvdimm_attribute_group,
907 &nd_device_attribute_group,
908 &acpi_nfit_dimm_attribute_group,
909 NULL,
910};
911
912static struct nvdimm *acpi_nfit_dimm_by_handle(struct acpi_nfit_desc *acpi_desc,
913 u32 device_handle)
914{
915 struct nfit_mem *nfit_mem;
916
917 list_for_each_entry(nfit_mem, &acpi_desc->dimms, list)
918 if (__to_nfit_memdev(nfit_mem)->device_handle == device_handle)
919 return nfit_mem->nvdimm;
920
921 return NULL;
922}
923
924static int acpi_nfit_add_dimm(struct acpi_nfit_desc *acpi_desc,
925 struct nfit_mem *nfit_mem, u32 device_handle)
926{
927 struct acpi_device *adev, *adev_dimm;
928 struct device *dev = acpi_desc->dev;
929 const u8 *uuid = to_nfit_uuid(NFIT_DEV_DIMM);
930 int i;
931
932 nfit_mem->dsm_mask = acpi_desc->dimm_dsm_force_en;
933 adev = to_acpi_dev(acpi_desc);
934 if (!adev)
935 return 0;
936
937 adev_dimm = acpi_find_child_device(adev, device_handle, false);
938 nfit_mem->adev = adev_dimm;
939 if (!adev_dimm) {
940 dev_err(dev, "no ACPI.NFIT device with _ADR %#x, disabling...\n",
941 device_handle);
942 return force_enable_dimms ? 0 : -ENODEV;
943 }
944
945 for (i = ND_CMD_SMART; i <= ND_CMD_VENDOR; i++)
946 if (acpi_check_dsm(adev_dimm->handle, uuid, 1, 1ULL << i))
947 set_bit(i, &nfit_mem->dsm_mask);
948
949 return 0;
950}
951
952static int acpi_nfit_register_dimms(struct acpi_nfit_desc *acpi_desc)
953{
954 struct nfit_mem *nfit_mem;
955 int dimm_count = 0;
956
957 list_for_each_entry(nfit_mem, &acpi_desc->dimms, list) {
958 struct nvdimm *nvdimm;
959 unsigned long flags = 0;
960 u32 device_handle;
961 u16 mem_flags;
962 int rc;
963
964 device_handle = __to_nfit_memdev(nfit_mem)->device_handle;
965 nvdimm = acpi_nfit_dimm_by_handle(acpi_desc, device_handle);
966 if (nvdimm) {
967 dimm_count++;
968 continue;
969 }
970
971 if (nfit_mem->bdw && nfit_mem->memdev_pmem)
972 flags |= NDD_ALIASING;
973
974 mem_flags = __to_nfit_memdev(nfit_mem)->flags;
975 if (mem_flags & ACPI_NFIT_MEM_NOT_ARMED)
976 flags |= NDD_UNARMED;
977
978 rc = acpi_nfit_add_dimm(acpi_desc, nfit_mem, device_handle);
979 if (rc)
980 continue;
981
982 nvdimm = nvdimm_create(acpi_desc->nvdimm_bus, nfit_mem,
983 acpi_nfit_dimm_attribute_groups,
984 flags, &nfit_mem->dsm_mask);
985 if (!nvdimm)
986 return -ENOMEM;
987
988 nfit_mem->nvdimm = nvdimm;
989 dimm_count++;
990
991 if ((mem_flags & ACPI_NFIT_MEM_FAILED_MASK) == 0)
992 continue;
993
994 dev_info(acpi_desc->dev, "%s flags:%s%s%s%s\n",
995 nvdimm_name(nvdimm),
996 mem_flags & ACPI_NFIT_MEM_SAVE_FAILED ? " save_fail" : "",
997 mem_flags & ACPI_NFIT_MEM_RESTORE_FAILED ? " restore_fail":"",
998 mem_flags & ACPI_NFIT_MEM_FLUSH_FAILED ? " flush_fail" : "",
999 mem_flags & ACPI_NFIT_MEM_NOT_ARMED ? " not_armed" : "");
1000
1001 }
1002
1003 return nvdimm_bus_check_dimm_count(acpi_desc->nvdimm_bus, dimm_count);
1004}
1005
1006static void acpi_nfit_init_dsms(struct acpi_nfit_desc *acpi_desc)
1007{
1008 struct nvdimm_bus_descriptor *nd_desc = &acpi_desc->nd_desc;
1009 const u8 *uuid = to_nfit_uuid(NFIT_DEV_BUS);
1010 struct acpi_device *adev;
1011 int i;
1012
1013 nd_desc->dsm_mask = acpi_desc->bus_dsm_force_en;
1014 adev = to_acpi_dev(acpi_desc);
1015 if (!adev)
1016 return;
1017
1018 for (i = ND_CMD_ARS_CAP; i <= ND_CMD_CLEAR_ERROR; i++)
1019 if (acpi_check_dsm(adev->handle, uuid, 1, 1ULL << i))
1020 set_bit(i, &nd_desc->dsm_mask);
1021}
1022
1023static ssize_t range_index_show(struct device *dev,
1024 struct device_attribute *attr, char *buf)
1025{
1026 struct nd_region *nd_region = to_nd_region(dev);
1027 struct nfit_spa *nfit_spa = nd_region_provider_data(nd_region);
1028
1029 return sprintf(buf, "%d\n", nfit_spa->spa->range_index);
1030}
1031static DEVICE_ATTR_RO(range_index);
1032
1033static struct attribute *acpi_nfit_region_attributes[] = {
1034 &dev_attr_range_index.attr,
1035 NULL,
1036};
1037
1038static struct attribute_group acpi_nfit_region_attribute_group = {
1039 .name = "nfit",
1040 .attrs = acpi_nfit_region_attributes,
1041};
1042
1043static const struct attribute_group *acpi_nfit_region_attribute_groups[] = {
1044 &nd_region_attribute_group,
1045 &nd_mapping_attribute_group,
1046 &nd_device_attribute_group,
1047 &nd_numa_attribute_group,
1048 &acpi_nfit_region_attribute_group,
1049 NULL,
1050};
1051
1052/* enough info to uniquely specify an interleave set */
1053struct nfit_set_info {
1054 struct nfit_set_info_map {
1055 u64 region_offset;
1056 u32 serial_number;
1057 u32 pad;
1058 } mapping[0];
1059};
1060
1061static size_t sizeof_nfit_set_info(int num_mappings)
1062{
1063 return sizeof(struct nfit_set_info)
1064 + num_mappings * sizeof(struct nfit_set_info_map);
1065}
1066
1067static int cmp_map(const void *m0, const void *m1)
1068{
1069 const struct nfit_set_info_map *map0 = m0;
1070 const struct nfit_set_info_map *map1 = m1;
1071
1072 return memcmp(&map0->region_offset, &map1->region_offset,
1073 sizeof(u64));
1074}
1075
1076/* Retrieve the nth entry referencing this spa */
1077static struct acpi_nfit_memory_map *memdev_from_spa(
1078 struct acpi_nfit_desc *acpi_desc, u16 range_index, int n)
1079{
1080 struct nfit_memdev *nfit_memdev;
1081
1082 list_for_each_entry(nfit_memdev, &acpi_desc->memdevs, list)
1083 if (nfit_memdev->memdev->range_index == range_index)
1084 if (n-- == 0)
1085 return nfit_memdev->memdev;
1086 return NULL;
1087}
1088
1089static int acpi_nfit_init_interleave_set(struct acpi_nfit_desc *acpi_desc,
1090 struct nd_region_desc *ndr_desc,
1091 struct acpi_nfit_system_address *spa)
1092{
1093 int i, spa_type = nfit_spa_type(spa);
1094 struct device *dev = acpi_desc->dev;
1095 struct nd_interleave_set *nd_set;
1096 u16 nr = ndr_desc->num_mappings;
1097 struct nfit_set_info *info;
1098
1099 if (spa_type == NFIT_SPA_PM || spa_type == NFIT_SPA_VOLATILE)
1100 /* pass */;
1101 else
1102 return 0;
1103
1104 nd_set = devm_kzalloc(dev, sizeof(*nd_set), GFP_KERNEL);
1105 if (!nd_set)
1106 return -ENOMEM;
1107
1108 info = devm_kzalloc(dev, sizeof_nfit_set_info(nr), GFP_KERNEL);
1109 if (!info)
1110 return -ENOMEM;
1111 for (i = 0; i < nr; i++) {
1112 struct nd_mapping *nd_mapping = &ndr_desc->nd_mapping[i];
1113 struct nfit_set_info_map *map = &info->mapping[i];
1114 struct nvdimm *nvdimm = nd_mapping->nvdimm;
1115 struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
1116 struct acpi_nfit_memory_map *memdev = memdev_from_spa(acpi_desc,
1117 spa->range_index, i);
1118
1119 if (!memdev || !nfit_mem->dcr) {
1120 dev_err(dev, "%s: failed to find DCR\n", __func__);
1121 return -ENODEV;
1122 }
1123
1124 map->region_offset = memdev->region_offset;
1125 map->serial_number = nfit_mem->dcr->serial_number;
1126 }
1127
1128 sort(&info->mapping[0], nr, sizeof(struct nfit_set_info_map),
1129 cmp_map, NULL);
1130 nd_set->cookie = nd_fletcher64(info, sizeof_nfit_set_info(nr), 0);
1131 ndr_desc->nd_set = nd_set;
1132 devm_kfree(dev, info);
1133
1134 return 0;
1135}
1136
1137static u64 to_interleave_offset(u64 offset, struct nfit_blk_mmio *mmio)
1138{
1139 struct acpi_nfit_interleave *idt = mmio->idt;
1140 u32 sub_line_offset, line_index, line_offset;
1141 u64 line_no, table_skip_count, table_offset;
1142
1143 line_no = div_u64_rem(offset, mmio->line_size, &sub_line_offset);
1144 table_skip_count = div_u64_rem(line_no, mmio->num_lines, &line_index);
1145 line_offset = idt->line_offset[line_index]
1146 * mmio->line_size;
1147 table_offset = table_skip_count * mmio->table_size;
1148
1149 return mmio->base_offset + line_offset + table_offset + sub_line_offset;
1150}
1151
1152static void wmb_blk(struct nfit_blk *nfit_blk)
1153{
1154
1155 if (nfit_blk->nvdimm_flush) {
1156 /*
1157 * The first wmb() is needed to 'sfence' all previous writes
1158 * such that they are architecturally visible for the platform
1159 * buffer flush. Note that we've already arranged for pmem
1160 * writes to avoid the cache via arch_memcpy_to_pmem(). The
1161 * final wmb() ensures ordering for the NVDIMM flush write.
1162 */
1163 wmb();
1164 writeq(1, nfit_blk->nvdimm_flush);
1165 wmb();
1166 } else
1167 wmb_pmem();
1168}
1169
1170static u32 read_blk_stat(struct nfit_blk *nfit_blk, unsigned int bw)
1171{
1172 struct nfit_blk_mmio *mmio = &nfit_blk->mmio[DCR];
1173 u64 offset = nfit_blk->stat_offset + mmio->size * bw;
1174
1175 if (mmio->num_lines)
1176 offset = to_interleave_offset(offset, mmio);
1177
1178 return readl(mmio->addr.base + offset);
1179}
1180
1181static void write_blk_ctl(struct nfit_blk *nfit_blk, unsigned int bw,
1182 resource_size_t dpa, unsigned int len, unsigned int write)
1183{
1184 u64 cmd, offset;
1185 struct nfit_blk_mmio *mmio = &nfit_blk->mmio[DCR];
1186
1187 enum {
1188 BCW_OFFSET_MASK = (1ULL << 48)-1,
1189 BCW_LEN_SHIFT = 48,
1190 BCW_LEN_MASK = (1ULL << 8) - 1,
1191 BCW_CMD_SHIFT = 56,
1192 };
1193
1194 cmd = (dpa >> L1_CACHE_SHIFT) & BCW_OFFSET_MASK;
1195 len = len >> L1_CACHE_SHIFT;
1196 cmd |= ((u64) len & BCW_LEN_MASK) << BCW_LEN_SHIFT;
1197 cmd |= ((u64) write) << BCW_CMD_SHIFT;
1198
1199 offset = nfit_blk->cmd_offset + mmio->size * bw;
1200 if (mmio->num_lines)
1201 offset = to_interleave_offset(offset, mmio);
1202
1203 writeq(cmd, mmio->addr.base + offset);
1204 wmb_blk(nfit_blk);
1205
1206 if (nfit_blk->dimm_flags & NFIT_BLK_DCR_LATCH)
1207 readq(mmio->addr.base + offset);
1208}
1209
1210static int acpi_nfit_blk_single_io(struct nfit_blk *nfit_blk,
1211 resource_size_t dpa, void *iobuf, size_t len, int rw,
1212 unsigned int lane)
1213{
1214 struct nfit_blk_mmio *mmio = &nfit_blk->mmio[BDW];
1215 unsigned int copied = 0;
1216 u64 base_offset;
1217 int rc;
1218
1219 base_offset = nfit_blk->bdw_offset + dpa % L1_CACHE_BYTES
1220 + lane * mmio->size;
1221 write_blk_ctl(nfit_blk, lane, dpa, len, rw);
1222 while (len) {
1223 unsigned int c;
1224 u64 offset;
1225
1226 if (mmio->num_lines) {
1227 u32 line_offset;
1228
1229 offset = to_interleave_offset(base_offset + copied,
1230 mmio);
1231 div_u64_rem(offset, mmio->line_size, &line_offset);
1232 c = min_t(size_t, len, mmio->line_size - line_offset);
1233 } else {
1234 offset = base_offset + nfit_blk->bdw_offset;
1235 c = len;
1236 }
1237
1238 if (rw)
1239 memcpy_to_pmem(mmio->addr.aperture + offset,
1240 iobuf + copied, c);
1241 else {
1242 if (nfit_blk->dimm_flags & NFIT_BLK_READ_FLUSH)
1243 mmio_flush_range((void __force *)
1244 mmio->addr.aperture + offset, c);
1245
1246 memcpy_from_pmem(iobuf + copied,
1247 mmio->addr.aperture + offset, c);
1248 }
1249
1250 copied += c;
1251 len -= c;
1252 }
1253
1254 if (rw)
1255 wmb_blk(nfit_blk);
1256
1257 rc = read_blk_stat(nfit_blk, lane) ? -EIO : 0;
1258 return rc;
1259}
1260
1261static int acpi_nfit_blk_region_do_io(struct nd_blk_region *ndbr,
1262 resource_size_t dpa, void *iobuf, u64 len, int rw)
1263{
1264 struct nfit_blk *nfit_blk = nd_blk_region_provider_data(ndbr);
1265 struct nfit_blk_mmio *mmio = &nfit_blk->mmio[BDW];
1266 struct nd_region *nd_region = nfit_blk->nd_region;
1267 unsigned int lane, copied = 0;
1268 int rc = 0;
1269
1270 lane = nd_region_acquire_lane(nd_region);
1271 while (len) {
1272 u64 c = min(len, mmio->size);
1273
1274 rc = acpi_nfit_blk_single_io(nfit_blk, dpa + copied,
1275 iobuf + copied, c, rw, lane);
1276 if (rc)
1277 break;
1278
1279 copied += c;
1280 len -= c;
1281 }
1282 nd_region_release_lane(nd_region, lane);
1283
1284 return rc;
1285}
1286
1287static void nfit_spa_mapping_release(struct kref *kref)
1288{
1289 struct nfit_spa_mapping *spa_map = to_spa_map(kref);
1290 struct acpi_nfit_system_address *spa = spa_map->spa;
1291 struct acpi_nfit_desc *acpi_desc = spa_map->acpi_desc;
1292
1293 WARN_ON(!mutex_is_locked(&acpi_desc->spa_map_mutex));
1294 dev_dbg(acpi_desc->dev, "%s: SPA%d\n", __func__, spa->range_index);
1295 if (spa_map->type == SPA_MAP_APERTURE)
1296 memunmap((void __force *)spa_map->addr.aperture);
1297 else
1298 iounmap(spa_map->addr.base);
1299 release_mem_region(spa->address, spa->length);
1300 list_del(&spa_map->list);
1301 kfree(spa_map);
1302}
1303
1304static struct nfit_spa_mapping *find_spa_mapping(
1305 struct acpi_nfit_desc *acpi_desc,
1306 struct acpi_nfit_system_address *spa)
1307{
1308 struct nfit_spa_mapping *spa_map;
1309
1310 WARN_ON(!mutex_is_locked(&acpi_desc->spa_map_mutex));
1311 list_for_each_entry(spa_map, &acpi_desc->spa_maps, list)
1312 if (spa_map->spa == spa)
1313 return spa_map;
1314
1315 return NULL;
1316}
1317
1318static void nfit_spa_unmap(struct acpi_nfit_desc *acpi_desc,
1319 struct acpi_nfit_system_address *spa)
1320{
1321 struct nfit_spa_mapping *spa_map;
1322
1323 mutex_lock(&acpi_desc->spa_map_mutex);
1324 spa_map = find_spa_mapping(acpi_desc, spa);
1325
1326 if (spa_map)
1327 kref_put(&spa_map->kref, nfit_spa_mapping_release);
1328 mutex_unlock(&acpi_desc->spa_map_mutex);
1329}
1330
1331static void __iomem *__nfit_spa_map(struct acpi_nfit_desc *acpi_desc,
1332 struct acpi_nfit_system_address *spa, enum spa_map_type type)
1333{
1334 resource_size_t start = spa->address;
1335 resource_size_t n = spa->length;
1336 struct nfit_spa_mapping *spa_map;
1337 struct resource *res;
1338
1339 WARN_ON(!mutex_is_locked(&acpi_desc->spa_map_mutex));
1340
1341 spa_map = find_spa_mapping(acpi_desc, spa);
1342 if (spa_map) {
1343 kref_get(&spa_map->kref);
1344 return spa_map->addr.base;
1345 }
1346
1347 spa_map = kzalloc(sizeof(*spa_map), GFP_KERNEL);
1348 if (!spa_map)
1349 return NULL;
1350
1351 INIT_LIST_HEAD(&spa_map->list);
1352 spa_map->spa = spa;
1353 kref_init(&spa_map->kref);
1354 spa_map->acpi_desc = acpi_desc;
1355
1356 res = request_mem_region(start, n, dev_name(acpi_desc->dev));
1357 if (!res)
1358 goto err_mem;
1359
1360 spa_map->type = type;
1361 if (type == SPA_MAP_APERTURE)
1362 spa_map->addr.aperture = (void __pmem *)memremap(start, n,
1363 ARCH_MEMREMAP_PMEM);
1364 else
1365 spa_map->addr.base = ioremap_nocache(start, n);
1366
1367
1368 if (!spa_map->addr.base)
1369 goto err_map;
1370
1371 list_add_tail(&spa_map->list, &acpi_desc->spa_maps);
1372 return spa_map->addr.base;
1373
1374 err_map:
1375 release_mem_region(start, n);
1376 err_mem:
1377 kfree(spa_map);
1378 return NULL;
1379}
1380
1381/**
1382 * nfit_spa_map - interleave-aware managed-mappings of acpi_nfit_system_address ranges
1383 * @nvdimm_bus: NFIT-bus that provided the spa table entry
1384 * @nfit_spa: spa table to map
1385 * @type: aperture or control region
1386 *
1387 * In the case where block-data-window apertures and
1388 * dimm-control-regions are interleaved they will end up sharing a
1389 * single request_mem_region() + ioremap() for the address range. In
1390 * the style of devm nfit_spa_map() mappings are automatically dropped
1391 * when all region devices referencing the same mapping are disabled /
1392 * unbound.
1393 */
1394static void __iomem *nfit_spa_map(struct acpi_nfit_desc *acpi_desc,
1395 struct acpi_nfit_system_address *spa, enum spa_map_type type)
1396{
1397 void __iomem *iomem;
1398
1399 mutex_lock(&acpi_desc->spa_map_mutex);
1400 iomem = __nfit_spa_map(acpi_desc, spa, type);
1401 mutex_unlock(&acpi_desc->spa_map_mutex);
1402
1403 return iomem;
1404}
1405
1406static int nfit_blk_init_interleave(struct nfit_blk_mmio *mmio,
1407 struct acpi_nfit_interleave *idt, u16 interleave_ways)
1408{
1409 if (idt) {
1410 mmio->num_lines = idt->line_count;
1411 mmio->line_size = idt->line_size;
1412 if (interleave_ways == 0)
1413 return -ENXIO;
1414 mmio->table_size = mmio->num_lines * interleave_ways
1415 * mmio->line_size;
1416 }
1417
1418 return 0;
1419}
1420
1421static int acpi_nfit_blk_get_flags(struct nvdimm_bus_descriptor *nd_desc,
1422 struct nvdimm *nvdimm, struct nfit_blk *nfit_blk)
1423{
1424 struct nd_cmd_dimm_flags flags;
1425 int rc;
1426
1427 memset(&flags, 0, sizeof(flags));
1428 rc = nd_desc->ndctl(nd_desc, nvdimm, ND_CMD_DIMM_FLAGS, &flags,
1429 sizeof(flags), NULL);
1430
1431 if (rc >= 0 && flags.status == 0)
1432 nfit_blk->dimm_flags = flags.flags;
1433 else if (rc == -ENOTTY) {
1434 /* fall back to a conservative default */
1435 nfit_blk->dimm_flags = NFIT_BLK_DCR_LATCH | NFIT_BLK_READ_FLUSH;
1436 rc = 0;
1437 } else
1438 rc = -ENXIO;
1439
1440 return rc;
1441}
1442
1443static int acpi_nfit_blk_region_enable(struct nvdimm_bus *nvdimm_bus,
1444 struct device *dev)
1445{
1446 struct nvdimm_bus_descriptor *nd_desc = to_nd_desc(nvdimm_bus);
1447 struct acpi_nfit_desc *acpi_desc = to_acpi_desc(nd_desc);
1448 struct nd_blk_region *ndbr = to_nd_blk_region(dev);
1449 struct nfit_flush *nfit_flush;
1450 struct nfit_blk_mmio *mmio;
1451 struct nfit_blk *nfit_blk;
1452 struct nfit_mem *nfit_mem;
1453 struct nvdimm *nvdimm;
1454 int rc;
1455
1456 nvdimm = nd_blk_region_to_dimm(ndbr);
1457 nfit_mem = nvdimm_provider_data(nvdimm);
1458 if (!nfit_mem || !nfit_mem->dcr || !nfit_mem->bdw) {
1459 dev_dbg(dev, "%s: missing%s%s%s\n", __func__,
1460 nfit_mem ? "" : " nfit_mem",
1461 (nfit_mem && nfit_mem->dcr) ? "" : " dcr",
1462 (nfit_mem && nfit_mem->bdw) ? "" : " bdw");
1463 return -ENXIO;
1464 }
1465
1466 nfit_blk = devm_kzalloc(dev, sizeof(*nfit_blk), GFP_KERNEL);
1467 if (!nfit_blk)
1468 return -ENOMEM;
1469 nd_blk_region_set_provider_data(ndbr, nfit_blk);
1470 nfit_blk->nd_region = to_nd_region(dev);
1471
1472 /* map block aperture memory */
1473 nfit_blk->bdw_offset = nfit_mem->bdw->offset;
1474 mmio = &nfit_blk->mmio[BDW];
1475 mmio->addr.base = nfit_spa_map(acpi_desc, nfit_mem->spa_bdw,
1476 SPA_MAP_APERTURE);
1477 if (!mmio->addr.base) {
1478 dev_dbg(dev, "%s: %s failed to map bdw\n", __func__,
1479 nvdimm_name(nvdimm));
1480 return -ENOMEM;
1481 }
1482 mmio->size = nfit_mem->bdw->size;
1483 mmio->base_offset = nfit_mem->memdev_bdw->region_offset;
1484 mmio->idt = nfit_mem->idt_bdw;
1485 mmio->spa = nfit_mem->spa_bdw;
1486 rc = nfit_blk_init_interleave(mmio, nfit_mem->idt_bdw,
1487 nfit_mem->memdev_bdw->interleave_ways);
1488 if (rc) {
1489 dev_dbg(dev, "%s: %s failed to init bdw interleave\n",
1490 __func__, nvdimm_name(nvdimm));
1491 return rc;
1492 }
1493
1494 /* map block control memory */
1495 nfit_blk->cmd_offset = nfit_mem->dcr->command_offset;
1496 nfit_blk->stat_offset = nfit_mem->dcr->status_offset;
1497 mmio = &nfit_blk->mmio[DCR];
1498 mmio->addr.base = nfit_spa_map(acpi_desc, nfit_mem->spa_dcr,
1499 SPA_MAP_CONTROL);
1500 if (!mmio->addr.base) {
1501 dev_dbg(dev, "%s: %s failed to map dcr\n", __func__,
1502 nvdimm_name(nvdimm));
1503 return -ENOMEM;
1504 }
1505 mmio->size = nfit_mem->dcr->window_size;
1506 mmio->base_offset = nfit_mem->memdev_dcr->region_offset;
1507 mmio->idt = nfit_mem->idt_dcr;
1508 mmio->spa = nfit_mem->spa_dcr;
1509 rc = nfit_blk_init_interleave(mmio, nfit_mem->idt_dcr,
1510 nfit_mem->memdev_dcr->interleave_ways);
1511 if (rc) {
1512 dev_dbg(dev, "%s: %s failed to init dcr interleave\n",
1513 __func__, nvdimm_name(nvdimm));
1514 return rc;
1515 }
1516
1517 rc = acpi_nfit_blk_get_flags(nd_desc, nvdimm, nfit_blk);
1518 if (rc < 0) {
1519 dev_dbg(dev, "%s: %s failed get DIMM flags\n",
1520 __func__, nvdimm_name(nvdimm));
1521 return rc;
1522 }
1523
1524 nfit_flush = nfit_mem->nfit_flush;
1525 if (nfit_flush && nfit_flush->flush->hint_count != 0) {
1526 nfit_blk->nvdimm_flush = devm_ioremap_nocache(dev,
1527 nfit_flush->flush->hint_address[0], 8);
1528 if (!nfit_blk->nvdimm_flush)
1529 return -ENOMEM;
1530 }
1531
1532 if (!arch_has_wmb_pmem() && !nfit_blk->nvdimm_flush)
1533 dev_warn(dev, "unable to guarantee persistence of writes\n");
1534
1535 if (mmio->line_size == 0)
1536 return 0;
1537
1538 if ((u32) nfit_blk->cmd_offset % mmio->line_size
1539 + 8 > mmio->line_size) {
1540 dev_dbg(dev, "cmd_offset crosses interleave boundary\n");
1541 return -ENXIO;
1542 } else if ((u32) nfit_blk->stat_offset % mmio->line_size
1543 + 8 > mmio->line_size) {
1544 dev_dbg(dev, "stat_offset crosses interleave boundary\n");
1545 return -ENXIO;
1546 }
1547
1548 return 0;
1549}
1550
1551static void acpi_nfit_blk_region_disable(struct nvdimm_bus *nvdimm_bus,
1552 struct device *dev)
1553{
1554 struct nvdimm_bus_descriptor *nd_desc = to_nd_desc(nvdimm_bus);
1555 struct acpi_nfit_desc *acpi_desc = to_acpi_desc(nd_desc);
1556 struct nd_blk_region *ndbr = to_nd_blk_region(dev);
1557 struct nfit_blk *nfit_blk = nd_blk_region_provider_data(ndbr);
1558 int i;
1559
1560 if (!nfit_blk)
1561 return; /* never enabled */
1562
1563 /* auto-free BLK spa mappings */
1564 for (i = 0; i < 2; i++) {
1565 struct nfit_blk_mmio *mmio = &nfit_blk->mmio[i];
1566
1567 if (mmio->addr.base)
1568 nfit_spa_unmap(acpi_desc, mmio->spa);
1569 }
1570 nd_blk_region_set_provider_data(ndbr, NULL);
1571 /* devm will free nfit_blk */
1572}
1573
1574static int ars_get_cap(struct acpi_nfit_desc *acpi_desc,
1575 struct nd_cmd_ars_cap *cmd, struct nfit_spa *nfit_spa)
1576{
1577 struct nvdimm_bus_descriptor *nd_desc = &acpi_desc->nd_desc;
1578 struct acpi_nfit_system_address *spa = nfit_spa->spa;
1579 int cmd_rc, rc;
1580
1581 cmd->address = spa->address;
1582 cmd->length = spa->length;
1583 rc = nd_desc->ndctl(nd_desc, NULL, ND_CMD_ARS_CAP, cmd,
1584 sizeof(*cmd), &cmd_rc);
1585 if (rc < 0)
1586 return rc;
1587 return cmd_rc;
1588}
1589
1590static int ars_start(struct acpi_nfit_desc *acpi_desc, struct nfit_spa *nfit_spa)
1591{
1592 int rc;
1593 int cmd_rc;
1594 struct nd_cmd_ars_start ars_start;
1595 struct acpi_nfit_system_address *spa = nfit_spa->spa;
1596 struct nvdimm_bus_descriptor *nd_desc = &acpi_desc->nd_desc;
1597
1598 memset(&ars_start, 0, sizeof(ars_start));
1599 ars_start.address = spa->address;
1600 ars_start.length = spa->length;
1601 if (nfit_spa_type(spa) == NFIT_SPA_PM)
1602 ars_start.type = ND_ARS_PERSISTENT;
1603 else if (nfit_spa_type(spa) == NFIT_SPA_VOLATILE)
1604 ars_start.type = ND_ARS_VOLATILE;
1605 else
1606 return -ENOTTY;
1607
1608 rc = nd_desc->ndctl(nd_desc, NULL, ND_CMD_ARS_START, &ars_start,
1609 sizeof(ars_start), &cmd_rc);
1610
1611 if (rc < 0)
1612 return rc;
1613 return cmd_rc;
1614}
1615
1616static int ars_continue(struct acpi_nfit_desc *acpi_desc)
1617{
1618 int rc, cmd_rc;
1619 struct nd_cmd_ars_start ars_start;
1620 struct nvdimm_bus_descriptor *nd_desc = &acpi_desc->nd_desc;
1621 struct nd_cmd_ars_status *ars_status = acpi_desc->ars_status;
1622
1623 memset(&ars_start, 0, sizeof(ars_start));
1624 ars_start.address = ars_status->restart_address;
1625 ars_start.length = ars_status->restart_length;
1626 ars_start.type = ars_status->type;
1627 rc = nd_desc->ndctl(nd_desc, NULL, ND_CMD_ARS_START, &ars_start,
1628 sizeof(ars_start), &cmd_rc);
1629 if (rc < 0)
1630 return rc;
1631 return cmd_rc;
1632}
1633
1634static int ars_get_status(struct acpi_nfit_desc *acpi_desc)
1635{
1636 struct nvdimm_bus_descriptor *nd_desc = &acpi_desc->nd_desc;
1637 struct nd_cmd_ars_status *ars_status = acpi_desc->ars_status;
1638 int rc, cmd_rc;
1639
1640 rc = nd_desc->ndctl(nd_desc, NULL, ND_CMD_ARS_STATUS, ars_status,
1641 acpi_desc->ars_status_size, &cmd_rc);
1642 if (rc < 0)
1643 return rc;
1644 return cmd_rc;
1645}
1646
1647static int ars_status_process_records(struct nvdimm_bus *nvdimm_bus,
1648 struct nd_cmd_ars_status *ars_status)
1649{
1650 int rc;
1651 u32 i;
1652
1653 for (i = 0; i < ars_status->num_records; i++) {
1654 rc = nvdimm_bus_add_poison(nvdimm_bus,
1655 ars_status->records[i].err_address,
1656 ars_status->records[i].length);
1657 if (rc)
1658 return rc;
1659 }
1660
1661 return 0;
1662}
1663
1664static void acpi_nfit_remove_resource(void *data)
1665{
1666 struct resource *res = data;
1667
1668 remove_resource(res);
1669}
1670
1671static int acpi_nfit_insert_resource(struct acpi_nfit_desc *acpi_desc,
1672 struct nd_region_desc *ndr_desc)
1673{
1674 struct resource *res, *nd_res = ndr_desc->res;
1675 int is_pmem, ret;
1676
1677 /* No operation if the region is already registered as PMEM */
1678 is_pmem = region_intersects(nd_res->start, resource_size(nd_res),
1679 IORESOURCE_MEM, IORES_DESC_PERSISTENT_MEMORY);
1680 if (is_pmem == REGION_INTERSECTS)
1681 return 0;
1682
1683 res = devm_kzalloc(acpi_desc->dev, sizeof(*res), GFP_KERNEL);
1684 if (!res)
1685 return -ENOMEM;
1686
1687 res->name = "Persistent Memory";
1688 res->start = nd_res->start;
1689 res->end = nd_res->end;
1690 res->flags = IORESOURCE_MEM;
1691 res->desc = IORES_DESC_PERSISTENT_MEMORY;
1692
1693 ret = insert_resource(&iomem_resource, res);
1694 if (ret)
1695 return ret;
1696
1697 ret = devm_add_action(acpi_desc->dev, acpi_nfit_remove_resource, res);
1698 if (ret) {
1699 remove_resource(res);
1700 return ret;
1701 }
1702
1703 return 0;
1704}
1705
1706static int acpi_nfit_init_mapping(struct acpi_nfit_desc *acpi_desc,
1707 struct nd_mapping *nd_mapping, struct nd_region_desc *ndr_desc,
1708 struct acpi_nfit_memory_map *memdev,
1709 struct nfit_spa *nfit_spa)
1710{
1711 struct nvdimm *nvdimm = acpi_nfit_dimm_by_handle(acpi_desc,
1712 memdev->device_handle);
1713 struct acpi_nfit_system_address *spa = nfit_spa->spa;
1714 struct nd_blk_region_desc *ndbr_desc;
1715 struct nfit_mem *nfit_mem;
1716 int blk_valid = 0;
1717
1718 if (!nvdimm) {
1719 dev_err(acpi_desc->dev, "spa%d dimm: %#x not found\n",
1720 spa->range_index, memdev->device_handle);
1721 return -ENODEV;
1722 }
1723
1724 nd_mapping->nvdimm = nvdimm;
1725 switch (nfit_spa_type(spa)) {
1726 case NFIT_SPA_PM:
1727 case NFIT_SPA_VOLATILE:
1728 nd_mapping->start = memdev->address;
1729 nd_mapping->size = memdev->region_size;
1730 break;
1731 case NFIT_SPA_DCR:
1732 nfit_mem = nvdimm_provider_data(nvdimm);
1733 if (!nfit_mem || !nfit_mem->bdw) {
1734 dev_dbg(acpi_desc->dev, "spa%d %s missing bdw\n",
1735 spa->range_index, nvdimm_name(nvdimm));
1736 } else {
1737 nd_mapping->size = nfit_mem->bdw->capacity;
1738 nd_mapping->start = nfit_mem->bdw->start_address;
1739 ndr_desc->num_lanes = nfit_mem->bdw->windows;
1740 blk_valid = 1;
1741 }
1742
1743 ndr_desc->nd_mapping = nd_mapping;
1744 ndr_desc->num_mappings = blk_valid;
1745 ndbr_desc = to_blk_region_desc(ndr_desc);
1746 ndbr_desc->enable = acpi_nfit_blk_region_enable;
1747 ndbr_desc->disable = acpi_nfit_blk_region_disable;
1748 ndbr_desc->do_io = acpi_desc->blk_do_io;
1749 nfit_spa->nd_region = nvdimm_blk_region_create(acpi_desc->nvdimm_bus,
1750 ndr_desc);
1751 if (!nfit_spa->nd_region)
1752 return -ENOMEM;
1753 break;
1754 }
1755
1756 return 0;
1757}
1758
1759static int acpi_nfit_register_region(struct acpi_nfit_desc *acpi_desc,
1760 struct nfit_spa *nfit_spa)
1761{
1762 static struct nd_mapping nd_mappings[ND_MAX_MAPPINGS];
1763 struct acpi_nfit_system_address *spa = nfit_spa->spa;
1764 struct nd_blk_region_desc ndbr_desc;
1765 struct nd_region_desc *ndr_desc;
1766 struct nfit_memdev *nfit_memdev;
1767 struct nvdimm_bus *nvdimm_bus;
1768 struct resource res;
1769 int count = 0, rc;
1770
1771 if (nfit_spa->nd_region)
1772 return 0;
1773
1774 if (spa->range_index == 0) {
1775 dev_dbg(acpi_desc->dev, "%s: detected invalid spa index\n",
1776 __func__);
1777 return 0;
1778 }
1779
1780 memset(&res, 0, sizeof(res));
1781 memset(&nd_mappings, 0, sizeof(nd_mappings));
1782 memset(&ndbr_desc, 0, sizeof(ndbr_desc));
1783 res.start = spa->address;
1784 res.end = res.start + spa->length - 1;
1785 ndr_desc = &ndbr_desc.ndr_desc;
1786 ndr_desc->res = &res;
1787 ndr_desc->provider_data = nfit_spa;
1788 ndr_desc->attr_groups = acpi_nfit_region_attribute_groups;
1789 if (spa->flags & ACPI_NFIT_PROXIMITY_VALID)
1790 ndr_desc->numa_node = acpi_map_pxm_to_online_node(
1791 spa->proximity_domain);
1792 else
1793 ndr_desc->numa_node = NUMA_NO_NODE;
1794
1795 list_for_each_entry(nfit_memdev, &acpi_desc->memdevs, list) {
1796 struct acpi_nfit_memory_map *memdev = nfit_memdev->memdev;
1797 struct nd_mapping *nd_mapping;
1798
1799 if (memdev->range_index != spa->range_index)
1800 continue;
1801 if (count >= ND_MAX_MAPPINGS) {
1802 dev_err(acpi_desc->dev, "spa%d exceeds max mappings %d\n",
1803 spa->range_index, ND_MAX_MAPPINGS);
1804 return -ENXIO;
1805 }
1806 nd_mapping = &nd_mappings[count++];
1807 rc = acpi_nfit_init_mapping(acpi_desc, nd_mapping, ndr_desc,
1808 memdev, nfit_spa);
1809 if (rc)
1810 goto out;
1811 }
1812
1813 ndr_desc->nd_mapping = nd_mappings;
1814 ndr_desc->num_mappings = count;
1815 rc = acpi_nfit_init_interleave_set(acpi_desc, ndr_desc, spa);
1816 if (rc)
1817 goto out;
1818
1819 nvdimm_bus = acpi_desc->nvdimm_bus;
1820 if (nfit_spa_type(spa) == NFIT_SPA_PM) {
1821 rc = acpi_nfit_insert_resource(acpi_desc, ndr_desc);
1822 if (rc) {
1823 dev_warn(acpi_desc->dev,
1824 "failed to insert pmem resource to iomem: %d\n",
1825 rc);
1826 goto out;
1827 }
1828
1829 nfit_spa->nd_region = nvdimm_pmem_region_create(nvdimm_bus,
1830 ndr_desc);
1831 if (!nfit_spa->nd_region)
1832 rc = -ENOMEM;
1833 } else if (nfit_spa_type(spa) == NFIT_SPA_VOLATILE) {
1834 nfit_spa->nd_region = nvdimm_volatile_region_create(nvdimm_bus,
1835 ndr_desc);
1836 if (!nfit_spa->nd_region)
1837 rc = -ENOMEM;
1838 }
1839
1840 out:
1841 if (rc)
1842 dev_err(acpi_desc->dev, "failed to register spa range %d\n",
1843 nfit_spa->spa->range_index);
1844 return rc;
1845}
1846
1847static int ars_status_alloc(struct acpi_nfit_desc *acpi_desc,
1848 u32 max_ars)
1849{
1850 struct device *dev = acpi_desc->dev;
1851 struct nd_cmd_ars_status *ars_status;
1852
1853 if (acpi_desc->ars_status && acpi_desc->ars_status_size >= max_ars) {
1854 memset(acpi_desc->ars_status, 0, acpi_desc->ars_status_size);
1855 return 0;
1856 }
1857
1858 if (acpi_desc->ars_status)
1859 devm_kfree(dev, acpi_desc->ars_status);
1860 acpi_desc->ars_status = NULL;
1861 ars_status = devm_kzalloc(dev, max_ars, GFP_KERNEL);
1862 if (!ars_status)
1863 return -ENOMEM;
1864 acpi_desc->ars_status = ars_status;
1865 acpi_desc->ars_status_size = max_ars;
1866 return 0;
1867}
1868
1869static int acpi_nfit_query_poison(struct acpi_nfit_desc *acpi_desc,
1870 struct nfit_spa *nfit_spa)
1871{
1872 struct acpi_nfit_system_address *spa = nfit_spa->spa;
1873 int rc;
1874
1875 if (!nfit_spa->max_ars) {
1876 struct nd_cmd_ars_cap ars_cap;
1877
1878 memset(&ars_cap, 0, sizeof(ars_cap));
1879 rc = ars_get_cap(acpi_desc, &ars_cap, nfit_spa);
1880 if (rc < 0)
1881 return rc;
1882 nfit_spa->max_ars = ars_cap.max_ars_out;
1883 nfit_spa->clear_err_unit = ars_cap.clear_err_unit;
1884 /* check that the supported scrub types match the spa type */
1885 if (nfit_spa_type(spa) == NFIT_SPA_VOLATILE &&
1886 ((ars_cap.status >> 16) & ND_ARS_VOLATILE) == 0)
1887 return -ENOTTY;
1888 else if (nfit_spa_type(spa) == NFIT_SPA_PM &&
1889 ((ars_cap.status >> 16) & ND_ARS_PERSISTENT) == 0)
1890 return -ENOTTY;
1891 }
1892
1893 if (ars_status_alloc(acpi_desc, nfit_spa->max_ars))
1894 return -ENOMEM;
1895
1896 rc = ars_get_status(acpi_desc);
1897 if (rc < 0 && rc != -ENOSPC)
1898 return rc;
1899
1900 if (ars_status_process_records(acpi_desc->nvdimm_bus,
1901 acpi_desc->ars_status))
1902 return -ENOMEM;
1903
1904 return 0;
1905}
1906
1907static void acpi_nfit_async_scrub(struct acpi_nfit_desc *acpi_desc,
1908 struct nfit_spa *nfit_spa)
1909{
1910 struct acpi_nfit_system_address *spa = nfit_spa->spa;
1911 unsigned int overflow_retry = scrub_overflow_abort;
1912 u64 init_ars_start = 0, init_ars_len = 0;
1913 struct device *dev = acpi_desc->dev;
1914 unsigned int tmo = scrub_timeout;
1915 int rc;
1916
1917 if (nfit_spa->ars_done || !nfit_spa->nd_region)
1918 return;
1919
1920 rc = ars_start(acpi_desc, nfit_spa);
1921 /*
1922 * If we timed out the initial scan we'll still be busy here,
1923 * and will wait another timeout before giving up permanently.
1924 */
1925 if (rc < 0 && rc != -EBUSY)
1926 return;
1927
1928 do {
1929 u64 ars_start, ars_len;
1930
1931 if (acpi_desc->cancel)
1932 break;
1933 rc = acpi_nfit_query_poison(acpi_desc, nfit_spa);
1934 if (rc == -ENOTTY)
1935 break;
1936 if (rc == -EBUSY && !tmo) {
1937 dev_warn(dev, "range %d ars timeout, aborting\n",
1938 spa->range_index);
1939 break;
1940 }
1941
1942 if (rc == -EBUSY) {
1943 /*
1944 * Note, entries may be appended to the list
1945 * while the lock is dropped, but the workqueue
1946 * being active prevents entries being deleted /
1947 * freed.
1948 */
1949 mutex_unlock(&acpi_desc->init_mutex);
1950 ssleep(1);
1951 tmo--;
1952 mutex_lock(&acpi_desc->init_mutex);
1953 continue;
1954 }
1955
1956 /* we got some results, but there are more pending... */
1957 if (rc == -ENOSPC && overflow_retry--) {
1958 if (!init_ars_len) {
1959 init_ars_len = acpi_desc->ars_status->length;
1960 init_ars_start = acpi_desc->ars_status->address;
1961 }
1962 rc = ars_continue(acpi_desc);
1963 }
1964
1965 if (rc < 0) {
1966 dev_warn(dev, "range %d ars continuation failed\n",
1967 spa->range_index);
1968 break;
1969 }
1970
1971 if (init_ars_len) {
1972 ars_start = init_ars_start;
1973 ars_len = init_ars_len;
1974 } else {
1975 ars_start = acpi_desc->ars_status->address;
1976 ars_len = acpi_desc->ars_status->length;
1977 }
1978 dev_dbg(dev, "spa range: %d ars from %#llx + %#llx complete\n",
1979 spa->range_index, ars_start, ars_len);
1980 /* notify the region about new poison entries */
1981 nvdimm_region_notify(nfit_spa->nd_region,
1982 NVDIMM_REVALIDATE_POISON);
1983 break;
1984 } while (1);
1985}
1986
1987static void acpi_nfit_scrub(struct work_struct *work)
1988{
1989 struct device *dev;
1990 u64 init_scrub_length = 0;
1991 struct nfit_spa *nfit_spa;
1992 u64 init_scrub_address = 0;
1993 bool init_ars_done = false;
1994 struct acpi_nfit_desc *acpi_desc;
1995 unsigned int tmo = scrub_timeout;
1996 unsigned int overflow_retry = scrub_overflow_abort;
1997
1998 acpi_desc = container_of(work, typeof(*acpi_desc), work);
1999 dev = acpi_desc->dev;
2000
2001 /*
2002 * We scrub in 2 phases. The first phase waits for any platform
2003 * firmware initiated scrubs to complete and then we go search for the
2004 * affected spa regions to mark them scanned. In the second phase we
2005 * initiate a directed scrub for every range that was not scrubbed in
2006 * phase 1.
2007 */
2008
2009 /* process platform firmware initiated scrubs */
2010 retry:
2011 mutex_lock(&acpi_desc->init_mutex);
2012 list_for_each_entry(nfit_spa, &acpi_desc->spas, list) {
2013 struct nd_cmd_ars_status *ars_status;
2014 struct acpi_nfit_system_address *spa;
2015 u64 ars_start, ars_len;
2016 int rc;
2017
2018 if (acpi_desc->cancel)
2019 break;
2020
2021 if (nfit_spa->nd_region)
2022 continue;
2023
2024 if (init_ars_done) {
2025 /*
2026 * No need to re-query, we're now just
2027 * reconciling all the ranges covered by the
2028 * initial scrub
2029 */
2030 rc = 0;
2031 } else
2032 rc = acpi_nfit_query_poison(acpi_desc, nfit_spa);
2033
2034 if (rc == -ENOTTY) {
2035 /* no ars capability, just register spa and move on */
2036 acpi_nfit_register_region(acpi_desc, nfit_spa);
2037 continue;
2038 }
2039
2040 if (rc == -EBUSY && !tmo) {
2041 /* fallthrough to directed scrub in phase 2 */
2042 dev_warn(dev, "timeout awaiting ars results, continuing...\n");
2043 break;
2044 } else if (rc == -EBUSY) {
2045 mutex_unlock(&acpi_desc->init_mutex);
2046 ssleep(1);
2047 tmo--;
2048 goto retry;
2049 }
2050
2051 /* we got some results, but there are more pending... */
2052 if (rc == -ENOSPC && overflow_retry--) {
2053 ars_status = acpi_desc->ars_status;
2054 /*
2055 * Record the original scrub range, so that we
2056 * can recall all the ranges impacted by the
2057 * initial scrub.
2058 */
2059 if (!init_scrub_length) {
2060 init_scrub_length = ars_status->length;
2061 init_scrub_address = ars_status->address;
2062 }
2063 rc = ars_continue(acpi_desc);
2064 if (rc == 0) {
2065 mutex_unlock(&acpi_desc->init_mutex);
2066 goto retry;
2067 }
2068 }
2069
2070 if (rc < 0) {
2071 /*
2072 * Initial scrub failed, we'll give it one more
2073 * try below...
2074 */
2075 break;
2076 }
2077
2078 /* We got some final results, record completed ranges */
2079 ars_status = acpi_desc->ars_status;
2080 if (init_scrub_length) {
2081 ars_start = init_scrub_address;
2082 ars_len = ars_start + init_scrub_length;
2083 } else {
2084 ars_start = ars_status->address;
2085 ars_len = ars_status->length;
2086 }
2087 spa = nfit_spa->spa;
2088
2089 if (!init_ars_done) {
2090 init_ars_done = true;
2091 dev_dbg(dev, "init scrub %#llx + %#llx complete\n",
2092 ars_start, ars_len);
2093 }
2094 if (ars_start <= spa->address && ars_start + ars_len
2095 >= spa->address + spa->length)
2096 acpi_nfit_register_region(acpi_desc, nfit_spa);
2097 }
2098
2099 /*
2100 * For all the ranges not covered by an initial scrub we still
2101 * want to see if there are errors, but it's ok to discover them
2102 * asynchronously.
2103 */
2104 list_for_each_entry(nfit_spa, &acpi_desc->spas, list) {
2105 /*
2106 * Flag all the ranges that still need scrubbing, but
2107 * register them now to make data available.
2108 */
2109 if (nfit_spa->nd_region)
2110 nfit_spa->ars_done = 1;
2111 else
2112 acpi_nfit_register_region(acpi_desc, nfit_spa);
2113 }
2114
2115 list_for_each_entry(nfit_spa, &acpi_desc->spas, list)
2116 acpi_nfit_async_scrub(acpi_desc, nfit_spa);
2117 mutex_unlock(&acpi_desc->init_mutex);
2118}
2119
2120static int acpi_nfit_register_regions(struct acpi_nfit_desc *acpi_desc)
2121{
2122 struct nfit_spa *nfit_spa;
2123 int rc;
2124
2125 list_for_each_entry(nfit_spa, &acpi_desc->spas, list)
2126 if (nfit_spa_type(nfit_spa->spa) == NFIT_SPA_DCR) {
2127 /* BLK regions don't need to wait for ars results */
2128 rc = acpi_nfit_register_region(acpi_desc, nfit_spa);
2129 if (rc)
2130 return rc;
2131 }
2132
2133 queue_work(nfit_wq, &acpi_desc->work);
2134 return 0;
2135}
2136
2137static int acpi_nfit_check_deletions(struct acpi_nfit_desc *acpi_desc,
2138 struct nfit_table_prev *prev)
2139{
2140 struct device *dev = acpi_desc->dev;
2141
2142 if (!list_empty(&prev->spas) ||
2143 !list_empty(&prev->memdevs) ||
2144 !list_empty(&prev->dcrs) ||
2145 !list_empty(&prev->bdws) ||
2146 !list_empty(&prev->idts) ||
2147 !list_empty(&prev->flushes)) {
2148 dev_err(dev, "new nfit deletes entries (unsupported)\n");
2149 return -ENXIO;
2150 }
2151 return 0;
2152}
2153
2154int acpi_nfit_init(struct acpi_nfit_desc *acpi_desc, acpi_size sz)
2155{
2156 struct device *dev = acpi_desc->dev;
2157 struct nfit_table_prev prev;
2158 const void *end;
2159 u8 *data;
2160 int rc;
2161
2162 mutex_lock(&acpi_desc->init_mutex);
2163
2164 INIT_LIST_HEAD(&prev.spas);
2165 INIT_LIST_HEAD(&prev.memdevs);
2166 INIT_LIST_HEAD(&prev.dcrs);
2167 INIT_LIST_HEAD(&prev.bdws);
2168 INIT_LIST_HEAD(&prev.idts);
2169 INIT_LIST_HEAD(&prev.flushes);
2170
2171 list_cut_position(&prev.spas, &acpi_desc->spas,
2172 acpi_desc->spas.prev);
2173 list_cut_position(&prev.memdevs, &acpi_desc->memdevs,
2174 acpi_desc->memdevs.prev);
2175 list_cut_position(&prev.dcrs, &acpi_desc->dcrs,
2176 acpi_desc->dcrs.prev);
2177 list_cut_position(&prev.bdws, &acpi_desc->bdws,
2178 acpi_desc->bdws.prev);
2179 list_cut_position(&prev.idts, &acpi_desc->idts,
2180 acpi_desc->idts.prev);
2181 list_cut_position(&prev.flushes, &acpi_desc->flushes,
2182 acpi_desc->flushes.prev);
2183
2184 data = (u8 *) acpi_desc->nfit;
2185 end = data + sz;
2186 while (!IS_ERR_OR_NULL(data))
2187 data = add_table(acpi_desc, &prev, data, end);
2188
2189 if (IS_ERR(data)) {
2190 dev_dbg(dev, "%s: nfit table parsing error: %ld\n", __func__,
2191 PTR_ERR(data));
2192 rc = PTR_ERR(data);
2193 goto out_unlock;
2194 }
2195
2196 rc = acpi_nfit_check_deletions(acpi_desc, &prev);
2197 if (rc)
2198 goto out_unlock;
2199
2200 if (nfit_mem_init(acpi_desc) != 0) {
2201 rc = -ENOMEM;
2202 goto out_unlock;
2203 }
2204
2205 acpi_nfit_init_dsms(acpi_desc);
2206
2207 rc = acpi_nfit_register_dimms(acpi_desc);
2208 if (rc)
2209 goto out_unlock;
2210
2211 rc = acpi_nfit_register_regions(acpi_desc);
2212
2213 out_unlock:
2214 mutex_unlock(&acpi_desc->init_mutex);
2215 return rc;
2216}
2217EXPORT_SYMBOL_GPL(acpi_nfit_init);
2218
2219struct acpi_nfit_flush_work {
2220 struct work_struct work;
2221 struct completion cmp;
2222};
2223
2224static void flush_probe(struct work_struct *work)
2225{
2226 struct acpi_nfit_flush_work *flush;
2227
2228 flush = container_of(work, typeof(*flush), work);
2229 complete(&flush->cmp);
2230}
2231
2232static int acpi_nfit_flush_probe(struct nvdimm_bus_descriptor *nd_desc)
2233{
2234 struct acpi_nfit_desc *acpi_desc = to_acpi_nfit_desc(nd_desc);
2235 struct device *dev = acpi_desc->dev;
2236 struct acpi_nfit_flush_work flush;
2237
2238 /* bounce the device lock to flush acpi_nfit_add / acpi_nfit_notify */
2239 device_lock(dev);
2240 device_unlock(dev);
2241
2242 /*
2243 * Scrub work could take 10s of seconds, userspace may give up so we
2244 * need to be interruptible while waiting.
2245 */
2246 INIT_WORK_ONSTACK(&flush.work, flush_probe);
2247 COMPLETION_INITIALIZER_ONSTACK(flush.cmp);
2248 queue_work(nfit_wq, &flush.work);
2249 return wait_for_completion_interruptible(&flush.cmp);
2250}
2251
2252static int acpi_nfit_clear_to_send(struct nvdimm_bus_descriptor *nd_desc,
2253 struct nvdimm *nvdimm, unsigned int cmd)
2254{
2255 struct acpi_nfit_desc *acpi_desc = to_acpi_nfit_desc(nd_desc);
2256
2257 if (nvdimm)
2258 return 0;
2259 if (cmd != ND_CMD_ARS_START)
2260 return 0;
2261
2262 /*
2263 * The kernel and userspace may race to initiate a scrub, but
2264 * the scrub thread is prepared to lose that initial race. It
2265 * just needs guarantees that any ars it initiates are not
2266 * interrupted by any intervening start reqeusts from userspace.
2267 */
2268 if (work_busy(&acpi_desc->work))
2269 return -EBUSY;
2270
2271 return 0;
2272}
2273
2274void acpi_nfit_desc_init(struct acpi_nfit_desc *acpi_desc, struct device *dev)
2275{
2276 struct nvdimm_bus_descriptor *nd_desc;
2277
2278 dev_set_drvdata(dev, acpi_desc);
2279 acpi_desc->dev = dev;
2280 acpi_desc->blk_do_io = acpi_nfit_blk_region_do_io;
2281 nd_desc = &acpi_desc->nd_desc;
2282 nd_desc->provider_name = "ACPI.NFIT";
2283 nd_desc->ndctl = acpi_nfit_ctl;
2284 nd_desc->flush_probe = acpi_nfit_flush_probe;
2285 nd_desc->clear_to_send = acpi_nfit_clear_to_send;
2286 nd_desc->attr_groups = acpi_nfit_attribute_groups;
2287
2288 INIT_LIST_HEAD(&acpi_desc->spa_maps);
2289 INIT_LIST_HEAD(&acpi_desc->spas);
2290 INIT_LIST_HEAD(&acpi_desc->dcrs);
2291 INIT_LIST_HEAD(&acpi_desc->bdws);
2292 INIT_LIST_HEAD(&acpi_desc->idts);
2293 INIT_LIST_HEAD(&acpi_desc->flushes);
2294 INIT_LIST_HEAD(&acpi_desc->memdevs);
2295 INIT_LIST_HEAD(&acpi_desc->dimms);
2296 mutex_init(&acpi_desc->spa_map_mutex);
2297 mutex_init(&acpi_desc->init_mutex);
2298 INIT_WORK(&acpi_desc->work, acpi_nfit_scrub);
2299}
2300EXPORT_SYMBOL_GPL(acpi_nfit_desc_init);
2301
2302static int acpi_nfit_add(struct acpi_device *adev)
2303{
2304 struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL };
2305 struct acpi_nfit_desc *acpi_desc;
2306 struct device *dev = &adev->dev;
2307 struct acpi_table_header *tbl;
2308 acpi_status status = AE_OK;
2309 acpi_size sz;
2310 int rc;
2311
2312 status = acpi_get_table_with_size("NFIT", 0, &tbl, &sz);
2313 if (ACPI_FAILURE(status)) {
2314 /* This is ok, we could have an nvdimm hotplugged later */
2315 dev_dbg(dev, "failed to find NFIT at startup\n");
2316 return 0;
2317 }
2318
2319 acpi_desc = devm_kzalloc(dev, sizeof(*acpi_desc), GFP_KERNEL);
2320 if (!acpi_desc)
2321 return -ENOMEM;
2322 acpi_nfit_desc_init(acpi_desc, &adev->dev);
2323 acpi_desc->nvdimm_bus = nvdimm_bus_register(dev, &acpi_desc->nd_desc);
2324 if (!acpi_desc->nvdimm_bus)
2325 return -ENOMEM;
2326
2327 /*
2328 * Save the acpi header for later and then skip it,
2329 * making nfit point to the first nfit table header.
2330 */
2331 acpi_desc->acpi_header = *tbl;
2332 acpi_desc->nfit = (void *) tbl + sizeof(struct acpi_table_nfit);
2333 sz -= sizeof(struct acpi_table_nfit);
2334
2335 /* Evaluate _FIT and override with that if present */
2336 status = acpi_evaluate_object(adev->handle, "_FIT", NULL, &buf);
2337 if (ACPI_SUCCESS(status) && buf.length > 0) {
2338 union acpi_object *obj;
2339 /*
2340 * Adjust for the acpi_object header of the _FIT
2341 */
2342 obj = buf.pointer;
2343 if (obj->type == ACPI_TYPE_BUFFER) {
2344 acpi_desc->nfit =
2345 (struct acpi_nfit_header *)obj->buffer.pointer;
2346 sz = obj->buffer.length;
2347 } else
2348 dev_dbg(dev, "%s invalid type %d, ignoring _FIT\n",
2349 __func__, (int) obj->type);
2350 }
2351
2352 rc = acpi_nfit_init(acpi_desc, sz);
2353 if (rc) {
2354 nvdimm_bus_unregister(acpi_desc->nvdimm_bus);
2355 return rc;
2356 }
2357 return 0;
2358}
2359
2360static int acpi_nfit_remove(struct acpi_device *adev)
2361{
2362 struct acpi_nfit_desc *acpi_desc = dev_get_drvdata(&adev->dev);
2363
2364 acpi_desc->cancel = 1;
2365 flush_workqueue(nfit_wq);
2366 nvdimm_bus_unregister(acpi_desc->nvdimm_bus);
2367 return 0;
2368}
2369
2370static void acpi_nfit_notify(struct acpi_device *adev, u32 event)
2371{
2372 struct acpi_nfit_desc *acpi_desc = dev_get_drvdata(&adev->dev);
2373 struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL };
2374 struct acpi_nfit_header *nfit_saved;
2375 union acpi_object *obj;
2376 struct device *dev = &adev->dev;
2377 acpi_status status;
2378 int ret;
2379
2380 dev_dbg(dev, "%s: event: %d\n", __func__, event);
2381
2382 device_lock(dev);
2383 if (!dev->driver) {
2384 /* dev->driver may be null if we're being removed */
2385 dev_dbg(dev, "%s: no driver found for dev\n", __func__);
2386 goto out_unlock;
2387 }
2388
2389 if (!acpi_desc) {
2390 acpi_desc = devm_kzalloc(dev, sizeof(*acpi_desc), GFP_KERNEL);
2391 if (!acpi_desc)
2392 goto out_unlock;
2393 acpi_nfit_desc_init(acpi_desc, &adev->dev);
2394 acpi_desc->nvdimm_bus = nvdimm_bus_register(dev, &acpi_desc->nd_desc);
2395 if (!acpi_desc->nvdimm_bus)
2396 goto out_unlock;
2397 } else {
2398 /*
2399 * Finish previous registration before considering new
2400 * regions.
2401 */
2402 flush_workqueue(nfit_wq);
2403 }
2404
2405 /* Evaluate _FIT */
2406 status = acpi_evaluate_object(adev->handle, "_FIT", NULL, &buf);
2407 if (ACPI_FAILURE(status)) {
2408 dev_err(dev, "failed to evaluate _FIT\n");
2409 goto out_unlock;
2410 }
2411
2412 nfit_saved = acpi_desc->nfit;
2413 obj = buf.pointer;
2414 if (obj->type == ACPI_TYPE_BUFFER) {
2415 acpi_desc->nfit =
2416 (struct acpi_nfit_header *)obj->buffer.pointer;
2417 ret = acpi_nfit_init(acpi_desc, obj->buffer.length);
2418 if (ret) {
2419 /* Merge failed, restore old nfit, and exit */
2420 acpi_desc->nfit = nfit_saved;
2421 dev_err(dev, "failed to merge updated NFIT\n");
2422 }
2423 } else {
2424 /* Bad _FIT, restore old nfit */
2425 dev_err(dev, "Invalid _FIT\n");
2426 }
2427 kfree(buf.pointer);
2428
2429 out_unlock:
2430 device_unlock(dev);
2431}
2432
2433static const struct acpi_device_id acpi_nfit_ids[] = {
2434 { "ACPI0012", 0 },
2435 { "", 0 },
2436};
2437MODULE_DEVICE_TABLE(acpi, acpi_nfit_ids);
2438
2439static struct acpi_driver acpi_nfit_driver = {
2440 .name = KBUILD_MODNAME,
2441 .ids = acpi_nfit_ids,
2442 .ops = {
2443 .add = acpi_nfit_add,
2444 .remove = acpi_nfit_remove,
2445 .notify = acpi_nfit_notify,
2446 },
2447};
2448
2449static __init int nfit_init(void)
2450{
2451 BUILD_BUG_ON(sizeof(struct acpi_table_nfit) != 40);
2452 BUILD_BUG_ON(sizeof(struct acpi_nfit_system_address) != 56);
2453 BUILD_BUG_ON(sizeof(struct acpi_nfit_memory_map) != 48);
2454 BUILD_BUG_ON(sizeof(struct acpi_nfit_interleave) != 20);
2455 BUILD_BUG_ON(sizeof(struct acpi_nfit_smbios) != 9);
2456 BUILD_BUG_ON(sizeof(struct acpi_nfit_control_region) != 80);
2457 BUILD_BUG_ON(sizeof(struct acpi_nfit_data_region) != 40);
2458
2459 acpi_str_to_uuid(UUID_VOLATILE_MEMORY, nfit_uuid[NFIT_SPA_VOLATILE]);
2460 acpi_str_to_uuid(UUID_PERSISTENT_MEMORY, nfit_uuid[NFIT_SPA_PM]);
2461 acpi_str_to_uuid(UUID_CONTROL_REGION, nfit_uuid[NFIT_SPA_DCR]);
2462 acpi_str_to_uuid(UUID_DATA_REGION, nfit_uuid[NFIT_SPA_BDW]);
2463 acpi_str_to_uuid(UUID_VOLATILE_VIRTUAL_DISK, nfit_uuid[NFIT_SPA_VDISK]);
2464 acpi_str_to_uuid(UUID_VOLATILE_VIRTUAL_CD, nfit_uuid[NFIT_SPA_VCD]);
2465 acpi_str_to_uuid(UUID_PERSISTENT_VIRTUAL_DISK, nfit_uuid[NFIT_SPA_PDISK]);
2466 acpi_str_to_uuid(UUID_PERSISTENT_VIRTUAL_CD, nfit_uuid[NFIT_SPA_PCD]);
2467 acpi_str_to_uuid(UUID_NFIT_BUS, nfit_uuid[NFIT_DEV_BUS]);
2468 acpi_str_to_uuid(UUID_NFIT_DIMM, nfit_uuid[NFIT_DEV_DIMM]);
2469
2470 nfit_wq = create_singlethread_workqueue("nfit");
2471 if (!nfit_wq)
2472 return -ENOMEM;
2473
2474 return acpi_bus_register_driver(&acpi_nfit_driver);
2475}
2476
2477static __exit void nfit_exit(void)
2478{
2479 acpi_bus_unregister_driver(&acpi_nfit_driver);
2480 destroy_workqueue(nfit_wq);
2481}
2482
2483module_init(nfit_init);
2484module_exit(nfit_exit);
2485MODULE_LICENSE("GPL v2");
2486MODULE_AUTHOR("Intel Corporation");