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nfit, libnvdimm: clarify "commands" vs "_DSMs"
[deliverable/linux.git] / drivers / acpi / nfit.c
1 /*
2 * Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of version 2 of the GNU General Public License as
6 * published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
12 */
13 #include <linux/list_sort.h>
14 #include <linux/libnvdimm.h>
15 #include <linux/module.h>
16 #include <linux/mutex.h>
17 #include <linux/ndctl.h>
18 #include <linux/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
34 static bool force_enable_dimms;
35 module_param(force_enable_dimms, bool, S_IRUGO|S_IWUSR);
36 MODULE_PARM_DESC(force_enable_dimms, "Ignore _STA (ACPI DIMM device) status");
37
38 static unsigned int scrub_timeout = NFIT_ARS_TIMEOUT;
39 module_param(scrub_timeout, uint, S_IRUGO|S_IWUSR);
40 MODULE_PARM_DESC(scrub_timeout, "Initial scrub timeout in seconds");
41
42 /* after three payloads of overflow, it's dead jim */
43 static unsigned int scrub_overflow_abort = 3;
44 module_param(scrub_overflow_abort, uint, S_IRUGO|S_IWUSR);
45 MODULE_PARM_DESC(scrub_overflow_abort,
46 "Number of times we overflow ARS results before abort");
47
48 static struct workqueue_struct *nfit_wq;
49
50 struct 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
59 static u8 nfit_uuid[NFIT_UUID_MAX][16];
60
61 const u8 *to_nfit_uuid(enum nfit_uuids id)
62 {
63 return nfit_uuid[id];
64 }
65 EXPORT_SYMBOL(to_nfit_uuid);
66
67 static 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
73 static 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
88 static 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
169 static 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 cmd_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 cmd_mask = nvdimm_cmd_mask(nvdimm);
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 cmd_mask = nd_desc->cmd_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, &cmd_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
293 out:
294 ACPI_FREE(out_obj);
295
296 return rc;
297 }
298
299 static const char *spa_type_name(u16 type)
300 {
301 static const char *to_name[] = {
302 [NFIT_SPA_VOLATILE] = "volatile",
303 [NFIT_SPA_PM] = "pmem",
304 [NFIT_SPA_DCR] = "dimm-control-region",
305 [NFIT_SPA_BDW] = "block-data-window",
306 [NFIT_SPA_VDISK] = "volatile-disk",
307 [NFIT_SPA_VCD] = "volatile-cd",
308 [NFIT_SPA_PDISK] = "persistent-disk",
309 [NFIT_SPA_PCD] = "persistent-cd",
310
311 };
312
313 if (type > NFIT_SPA_PCD)
314 return "unknown";
315
316 return to_name[type];
317 }
318
319 static int nfit_spa_type(struct acpi_nfit_system_address *spa)
320 {
321 int i;
322
323 for (i = 0; i < NFIT_UUID_MAX; i++)
324 if (memcmp(to_nfit_uuid(i), spa->range_guid, 16) == 0)
325 return i;
326 return -1;
327 }
328
329 static bool add_spa(struct acpi_nfit_desc *acpi_desc,
330 struct nfit_table_prev *prev,
331 struct acpi_nfit_system_address *spa)
332 {
333 size_t length = min_t(size_t, sizeof(*spa), spa->header.length);
334 struct device *dev = acpi_desc->dev;
335 struct nfit_spa *nfit_spa;
336
337 list_for_each_entry(nfit_spa, &prev->spas, list) {
338 if (memcmp(nfit_spa->spa, spa, length) == 0) {
339 list_move_tail(&nfit_spa->list, &acpi_desc->spas);
340 return true;
341 }
342 }
343
344 nfit_spa = devm_kzalloc(dev, sizeof(*nfit_spa), GFP_KERNEL);
345 if (!nfit_spa)
346 return false;
347 INIT_LIST_HEAD(&nfit_spa->list);
348 nfit_spa->spa = spa;
349 list_add_tail(&nfit_spa->list, &acpi_desc->spas);
350 dev_dbg(dev, "%s: spa index: %d type: %s\n", __func__,
351 spa->range_index,
352 spa_type_name(nfit_spa_type(spa)));
353 return true;
354 }
355
356 static bool add_memdev(struct acpi_nfit_desc *acpi_desc,
357 struct nfit_table_prev *prev,
358 struct acpi_nfit_memory_map *memdev)
359 {
360 size_t length = min_t(size_t, sizeof(*memdev), memdev->header.length);
361 struct device *dev = acpi_desc->dev;
362 struct nfit_memdev *nfit_memdev;
363
364 list_for_each_entry(nfit_memdev, &prev->memdevs, list)
365 if (memcmp(nfit_memdev->memdev, memdev, length) == 0) {
366 list_move_tail(&nfit_memdev->list, &acpi_desc->memdevs);
367 return true;
368 }
369
370 nfit_memdev = devm_kzalloc(dev, sizeof(*nfit_memdev), GFP_KERNEL);
371 if (!nfit_memdev)
372 return false;
373 INIT_LIST_HEAD(&nfit_memdev->list);
374 nfit_memdev->memdev = memdev;
375 list_add_tail(&nfit_memdev->list, &acpi_desc->memdevs);
376 dev_dbg(dev, "%s: memdev handle: %#x spa: %d dcr: %d\n",
377 __func__, memdev->device_handle, memdev->range_index,
378 memdev->region_index);
379 return true;
380 }
381
382 static bool add_dcr(struct acpi_nfit_desc *acpi_desc,
383 struct nfit_table_prev *prev,
384 struct acpi_nfit_control_region *dcr)
385 {
386 size_t length = min_t(size_t, sizeof(*dcr), dcr->header.length);
387 struct device *dev = acpi_desc->dev;
388 struct nfit_dcr *nfit_dcr;
389
390 list_for_each_entry(nfit_dcr, &prev->dcrs, list)
391 if (memcmp(nfit_dcr->dcr, dcr, length) == 0) {
392 list_move_tail(&nfit_dcr->list, &acpi_desc->dcrs);
393 return true;
394 }
395
396 nfit_dcr = devm_kzalloc(dev, sizeof(*nfit_dcr), GFP_KERNEL);
397 if (!nfit_dcr)
398 return false;
399 INIT_LIST_HEAD(&nfit_dcr->list);
400 nfit_dcr->dcr = dcr;
401 list_add_tail(&nfit_dcr->list, &acpi_desc->dcrs);
402 dev_dbg(dev, "%s: dcr index: %d windows: %d\n", __func__,
403 dcr->region_index, dcr->windows);
404 return true;
405 }
406
407 static bool add_bdw(struct acpi_nfit_desc *acpi_desc,
408 struct nfit_table_prev *prev,
409 struct acpi_nfit_data_region *bdw)
410 {
411 size_t length = min_t(size_t, sizeof(*bdw), bdw->header.length);
412 struct device *dev = acpi_desc->dev;
413 struct nfit_bdw *nfit_bdw;
414
415 list_for_each_entry(nfit_bdw, &prev->bdws, list)
416 if (memcmp(nfit_bdw->bdw, bdw, length) == 0) {
417 list_move_tail(&nfit_bdw->list, &acpi_desc->bdws);
418 return true;
419 }
420
421 nfit_bdw = devm_kzalloc(dev, sizeof(*nfit_bdw), GFP_KERNEL);
422 if (!nfit_bdw)
423 return false;
424 INIT_LIST_HEAD(&nfit_bdw->list);
425 nfit_bdw->bdw = bdw;
426 list_add_tail(&nfit_bdw->list, &acpi_desc->bdws);
427 dev_dbg(dev, "%s: bdw dcr: %d windows: %d\n", __func__,
428 bdw->region_index, bdw->windows);
429 return true;
430 }
431
432 static bool add_idt(struct acpi_nfit_desc *acpi_desc,
433 struct nfit_table_prev *prev,
434 struct acpi_nfit_interleave *idt)
435 {
436 size_t length = min_t(size_t, sizeof(*idt), idt->header.length);
437 struct device *dev = acpi_desc->dev;
438 struct nfit_idt *nfit_idt;
439
440 list_for_each_entry(nfit_idt, &prev->idts, list)
441 if (memcmp(nfit_idt->idt, idt, length) == 0) {
442 list_move_tail(&nfit_idt->list, &acpi_desc->idts);
443 return true;
444 }
445
446 nfit_idt = devm_kzalloc(dev, sizeof(*nfit_idt), GFP_KERNEL);
447 if (!nfit_idt)
448 return false;
449 INIT_LIST_HEAD(&nfit_idt->list);
450 nfit_idt->idt = idt;
451 list_add_tail(&nfit_idt->list, &acpi_desc->idts);
452 dev_dbg(dev, "%s: idt index: %d num_lines: %d\n", __func__,
453 idt->interleave_index, idt->line_count);
454 return true;
455 }
456
457 static bool add_flush(struct acpi_nfit_desc *acpi_desc,
458 struct nfit_table_prev *prev,
459 struct acpi_nfit_flush_address *flush)
460 {
461 size_t length = min_t(size_t, sizeof(*flush), flush->header.length);
462 struct device *dev = acpi_desc->dev;
463 struct nfit_flush *nfit_flush;
464
465 list_for_each_entry(nfit_flush, &prev->flushes, list)
466 if (memcmp(nfit_flush->flush, flush, length) == 0) {
467 list_move_tail(&nfit_flush->list, &acpi_desc->flushes);
468 return true;
469 }
470
471 nfit_flush = devm_kzalloc(dev, sizeof(*nfit_flush), GFP_KERNEL);
472 if (!nfit_flush)
473 return false;
474 INIT_LIST_HEAD(&nfit_flush->list);
475 nfit_flush->flush = flush;
476 list_add_tail(&nfit_flush->list, &acpi_desc->flushes);
477 dev_dbg(dev, "%s: nfit_flush handle: %d hint_count: %d\n", __func__,
478 flush->device_handle, flush->hint_count);
479 return true;
480 }
481
482 static void *add_table(struct acpi_nfit_desc *acpi_desc,
483 struct nfit_table_prev *prev, void *table, const void *end)
484 {
485 struct device *dev = acpi_desc->dev;
486 struct acpi_nfit_header *hdr;
487 void *err = ERR_PTR(-ENOMEM);
488
489 if (table >= end)
490 return NULL;
491
492 hdr = table;
493 if (!hdr->length) {
494 dev_warn(dev, "found a zero length table '%d' parsing nfit\n",
495 hdr->type);
496 return NULL;
497 }
498
499 switch (hdr->type) {
500 case ACPI_NFIT_TYPE_SYSTEM_ADDRESS:
501 if (!add_spa(acpi_desc, prev, table))
502 return err;
503 break;
504 case ACPI_NFIT_TYPE_MEMORY_MAP:
505 if (!add_memdev(acpi_desc, prev, table))
506 return err;
507 break;
508 case ACPI_NFIT_TYPE_CONTROL_REGION:
509 if (!add_dcr(acpi_desc, prev, table))
510 return err;
511 break;
512 case ACPI_NFIT_TYPE_DATA_REGION:
513 if (!add_bdw(acpi_desc, prev, table))
514 return err;
515 break;
516 case ACPI_NFIT_TYPE_INTERLEAVE:
517 if (!add_idt(acpi_desc, prev, table))
518 return err;
519 break;
520 case ACPI_NFIT_TYPE_FLUSH_ADDRESS:
521 if (!add_flush(acpi_desc, prev, table))
522 return err;
523 break;
524 case ACPI_NFIT_TYPE_SMBIOS:
525 dev_dbg(dev, "%s: smbios\n", __func__);
526 break;
527 default:
528 dev_err(dev, "unknown table '%d' parsing nfit\n", hdr->type);
529 break;
530 }
531
532 return table + hdr->length;
533 }
534
535 static void nfit_mem_find_spa_bdw(struct acpi_nfit_desc *acpi_desc,
536 struct nfit_mem *nfit_mem)
537 {
538 u32 device_handle = __to_nfit_memdev(nfit_mem)->device_handle;
539 u16 dcr = nfit_mem->dcr->region_index;
540 struct nfit_spa *nfit_spa;
541
542 list_for_each_entry(nfit_spa, &acpi_desc->spas, list) {
543 u16 range_index = nfit_spa->spa->range_index;
544 int type = nfit_spa_type(nfit_spa->spa);
545 struct nfit_memdev *nfit_memdev;
546
547 if (type != NFIT_SPA_BDW)
548 continue;
549
550 list_for_each_entry(nfit_memdev, &acpi_desc->memdevs, list) {
551 if (nfit_memdev->memdev->range_index != range_index)
552 continue;
553 if (nfit_memdev->memdev->device_handle != device_handle)
554 continue;
555 if (nfit_memdev->memdev->region_index != dcr)
556 continue;
557
558 nfit_mem->spa_bdw = nfit_spa->spa;
559 return;
560 }
561 }
562
563 dev_dbg(acpi_desc->dev, "SPA-BDW not found for SPA-DCR %d\n",
564 nfit_mem->spa_dcr->range_index);
565 nfit_mem->bdw = NULL;
566 }
567
568 static void nfit_mem_init_bdw(struct acpi_nfit_desc *acpi_desc,
569 struct nfit_mem *nfit_mem, struct acpi_nfit_system_address *spa)
570 {
571 u16 dcr = __to_nfit_memdev(nfit_mem)->region_index;
572 struct nfit_memdev *nfit_memdev;
573 struct nfit_flush *nfit_flush;
574 struct nfit_bdw *nfit_bdw;
575 struct nfit_idt *nfit_idt;
576 u16 idt_idx, range_index;
577
578 list_for_each_entry(nfit_bdw, &acpi_desc->bdws, list) {
579 if (nfit_bdw->bdw->region_index != dcr)
580 continue;
581 nfit_mem->bdw = nfit_bdw->bdw;
582 break;
583 }
584
585 if (!nfit_mem->bdw)
586 return;
587
588 nfit_mem_find_spa_bdw(acpi_desc, nfit_mem);
589
590 if (!nfit_mem->spa_bdw)
591 return;
592
593 range_index = nfit_mem->spa_bdw->range_index;
594 list_for_each_entry(nfit_memdev, &acpi_desc->memdevs, list) {
595 if (nfit_memdev->memdev->range_index != range_index ||
596 nfit_memdev->memdev->region_index != dcr)
597 continue;
598 nfit_mem->memdev_bdw = nfit_memdev->memdev;
599 idt_idx = nfit_memdev->memdev->interleave_index;
600 list_for_each_entry(nfit_idt, &acpi_desc->idts, list) {
601 if (nfit_idt->idt->interleave_index != idt_idx)
602 continue;
603 nfit_mem->idt_bdw = nfit_idt->idt;
604 break;
605 }
606
607 list_for_each_entry(nfit_flush, &acpi_desc->flushes, list) {
608 if (nfit_flush->flush->device_handle !=
609 nfit_memdev->memdev->device_handle)
610 continue;
611 nfit_mem->nfit_flush = nfit_flush;
612 break;
613 }
614 break;
615 }
616 }
617
618 static int nfit_mem_dcr_init(struct acpi_nfit_desc *acpi_desc,
619 struct acpi_nfit_system_address *spa)
620 {
621 struct nfit_mem *nfit_mem, *found;
622 struct nfit_memdev *nfit_memdev;
623 int type = nfit_spa_type(spa);
624
625 switch (type) {
626 case NFIT_SPA_DCR:
627 case NFIT_SPA_PM:
628 break;
629 default:
630 return 0;
631 }
632
633 list_for_each_entry(nfit_memdev, &acpi_desc->memdevs, list) {
634 struct nfit_dcr *nfit_dcr;
635 u32 device_handle;
636 u16 dcr;
637
638 if (nfit_memdev->memdev->range_index != spa->range_index)
639 continue;
640 found = NULL;
641 dcr = nfit_memdev->memdev->region_index;
642 device_handle = nfit_memdev->memdev->device_handle;
643 list_for_each_entry(nfit_mem, &acpi_desc->dimms, list)
644 if (__to_nfit_memdev(nfit_mem)->device_handle
645 == device_handle) {
646 found = nfit_mem;
647 break;
648 }
649
650 if (found)
651 nfit_mem = found;
652 else {
653 nfit_mem = devm_kzalloc(acpi_desc->dev,
654 sizeof(*nfit_mem), GFP_KERNEL);
655 if (!nfit_mem)
656 return -ENOMEM;
657 INIT_LIST_HEAD(&nfit_mem->list);
658 list_add(&nfit_mem->list, &acpi_desc->dimms);
659 }
660
661 list_for_each_entry(nfit_dcr, &acpi_desc->dcrs, list) {
662 if (nfit_dcr->dcr->region_index != dcr)
663 continue;
664 /*
665 * Record the control region for the dimm. For
666 * the ACPI 6.1 case, where there are separate
667 * control regions for the pmem vs blk
668 * interfaces, be sure to record the extended
669 * blk details.
670 */
671 if (!nfit_mem->dcr)
672 nfit_mem->dcr = nfit_dcr->dcr;
673 else if (nfit_mem->dcr->windows == 0
674 && nfit_dcr->dcr->windows)
675 nfit_mem->dcr = nfit_dcr->dcr;
676 break;
677 }
678
679 if (dcr && !nfit_mem->dcr) {
680 dev_err(acpi_desc->dev, "SPA %d missing DCR %d\n",
681 spa->range_index, dcr);
682 return -ENODEV;
683 }
684
685 if (type == NFIT_SPA_DCR) {
686 struct nfit_idt *nfit_idt;
687 u16 idt_idx;
688
689 /* multiple dimms may share a SPA when interleaved */
690 nfit_mem->spa_dcr = spa;
691 nfit_mem->memdev_dcr = nfit_memdev->memdev;
692 idt_idx = nfit_memdev->memdev->interleave_index;
693 list_for_each_entry(nfit_idt, &acpi_desc->idts, list) {
694 if (nfit_idt->idt->interleave_index != idt_idx)
695 continue;
696 nfit_mem->idt_dcr = nfit_idt->idt;
697 break;
698 }
699 nfit_mem_init_bdw(acpi_desc, nfit_mem, spa);
700 } else {
701 /*
702 * A single dimm may belong to multiple SPA-PM
703 * ranges, record at least one in addition to
704 * any SPA-DCR range.
705 */
706 nfit_mem->memdev_pmem = nfit_memdev->memdev;
707 }
708 }
709
710 return 0;
711 }
712
713 static int nfit_mem_cmp(void *priv, struct list_head *_a, struct list_head *_b)
714 {
715 struct nfit_mem *a = container_of(_a, typeof(*a), list);
716 struct nfit_mem *b = container_of(_b, typeof(*b), list);
717 u32 handleA, handleB;
718
719 handleA = __to_nfit_memdev(a)->device_handle;
720 handleB = __to_nfit_memdev(b)->device_handle;
721 if (handleA < handleB)
722 return -1;
723 else if (handleA > handleB)
724 return 1;
725 return 0;
726 }
727
728 static int nfit_mem_init(struct acpi_nfit_desc *acpi_desc)
729 {
730 struct nfit_spa *nfit_spa;
731
732 /*
733 * For each SPA-DCR or SPA-PMEM address range find its
734 * corresponding MEMDEV(s). From each MEMDEV find the
735 * corresponding DCR. Then, if we're operating on a SPA-DCR,
736 * try to find a SPA-BDW and a corresponding BDW that references
737 * the DCR. Throw it all into an nfit_mem object. Note, that
738 * BDWs are optional.
739 */
740 list_for_each_entry(nfit_spa, &acpi_desc->spas, list) {
741 int rc;
742
743 rc = nfit_mem_dcr_init(acpi_desc, nfit_spa->spa);
744 if (rc)
745 return rc;
746 }
747
748 list_sort(NULL, &acpi_desc->dimms, nfit_mem_cmp);
749
750 return 0;
751 }
752
753 static ssize_t revision_show(struct device *dev,
754 struct device_attribute *attr, char *buf)
755 {
756 struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev);
757 struct nvdimm_bus_descriptor *nd_desc = to_nd_desc(nvdimm_bus);
758 struct acpi_nfit_desc *acpi_desc = to_acpi_desc(nd_desc);
759
760 return sprintf(buf, "%d\n", acpi_desc->acpi_header.revision);
761 }
762 static DEVICE_ATTR_RO(revision);
763
764 static struct attribute *acpi_nfit_attributes[] = {
765 &dev_attr_revision.attr,
766 NULL,
767 };
768
769 static struct attribute_group acpi_nfit_attribute_group = {
770 .name = "nfit",
771 .attrs = acpi_nfit_attributes,
772 };
773
774 static const struct attribute_group *acpi_nfit_attribute_groups[] = {
775 &nvdimm_bus_attribute_group,
776 &acpi_nfit_attribute_group,
777 NULL,
778 };
779
780 static struct acpi_nfit_memory_map *to_nfit_memdev(struct device *dev)
781 {
782 struct nvdimm *nvdimm = to_nvdimm(dev);
783 struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
784
785 return __to_nfit_memdev(nfit_mem);
786 }
787
788 static struct acpi_nfit_control_region *to_nfit_dcr(struct device *dev)
789 {
790 struct nvdimm *nvdimm = to_nvdimm(dev);
791 struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
792
793 return nfit_mem->dcr;
794 }
795
796 static ssize_t handle_show(struct device *dev,
797 struct device_attribute *attr, char *buf)
798 {
799 struct acpi_nfit_memory_map *memdev = to_nfit_memdev(dev);
800
801 return sprintf(buf, "%#x\n", memdev->device_handle);
802 }
803 static DEVICE_ATTR_RO(handle);
804
805 static ssize_t phys_id_show(struct device *dev,
806 struct device_attribute *attr, char *buf)
807 {
808 struct acpi_nfit_memory_map *memdev = to_nfit_memdev(dev);
809
810 return sprintf(buf, "%#x\n", memdev->physical_id);
811 }
812 static DEVICE_ATTR_RO(phys_id);
813
814 static ssize_t vendor_show(struct device *dev,
815 struct device_attribute *attr, char *buf)
816 {
817 struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev);
818
819 return sprintf(buf, "%#x\n", dcr->vendor_id);
820 }
821 static DEVICE_ATTR_RO(vendor);
822
823 static ssize_t rev_id_show(struct device *dev,
824 struct device_attribute *attr, char *buf)
825 {
826 struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev);
827
828 return sprintf(buf, "%#x\n", dcr->revision_id);
829 }
830 static DEVICE_ATTR_RO(rev_id);
831
832 static ssize_t device_show(struct device *dev,
833 struct device_attribute *attr, char *buf)
834 {
835 struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev);
836
837 return sprintf(buf, "%#x\n", dcr->device_id);
838 }
839 static DEVICE_ATTR_RO(device);
840
841 static ssize_t format_show(struct device *dev,
842 struct device_attribute *attr, char *buf)
843 {
844 struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev);
845
846 return sprintf(buf, "%#x\n", dcr->code);
847 }
848 static DEVICE_ATTR_RO(format);
849
850 static ssize_t serial_show(struct device *dev,
851 struct device_attribute *attr, char *buf)
852 {
853 struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev);
854
855 return sprintf(buf, "%#x\n", dcr->serial_number);
856 }
857 static DEVICE_ATTR_RO(serial);
858
859 static ssize_t flags_show(struct device *dev,
860 struct device_attribute *attr, char *buf)
861 {
862 u16 flags = to_nfit_memdev(dev)->flags;
863
864 return sprintf(buf, "%s%s%s%s%s\n",
865 flags & ACPI_NFIT_MEM_SAVE_FAILED ? "save_fail " : "",
866 flags & ACPI_NFIT_MEM_RESTORE_FAILED ? "restore_fail " : "",
867 flags & ACPI_NFIT_MEM_FLUSH_FAILED ? "flush_fail " : "",
868 flags & ACPI_NFIT_MEM_NOT_ARMED ? "not_armed " : "",
869 flags & ACPI_NFIT_MEM_HEALTH_OBSERVED ? "smart_event " : "");
870 }
871 static DEVICE_ATTR_RO(flags);
872
873 static struct attribute *acpi_nfit_dimm_attributes[] = {
874 &dev_attr_handle.attr,
875 &dev_attr_phys_id.attr,
876 &dev_attr_vendor.attr,
877 &dev_attr_device.attr,
878 &dev_attr_format.attr,
879 &dev_attr_serial.attr,
880 &dev_attr_rev_id.attr,
881 &dev_attr_flags.attr,
882 NULL,
883 };
884
885 static umode_t acpi_nfit_dimm_attr_visible(struct kobject *kobj,
886 struct attribute *a, int n)
887 {
888 struct device *dev = container_of(kobj, struct device, kobj);
889
890 if (to_nfit_dcr(dev))
891 return a->mode;
892 else
893 return 0;
894 }
895
896 static struct attribute_group acpi_nfit_dimm_attribute_group = {
897 .name = "nfit",
898 .attrs = acpi_nfit_dimm_attributes,
899 .is_visible = acpi_nfit_dimm_attr_visible,
900 };
901
902 static const struct attribute_group *acpi_nfit_dimm_attribute_groups[] = {
903 &nvdimm_attribute_group,
904 &nd_device_attribute_group,
905 &acpi_nfit_dimm_attribute_group,
906 NULL,
907 };
908
909 static struct nvdimm *acpi_nfit_dimm_by_handle(struct acpi_nfit_desc *acpi_desc,
910 u32 device_handle)
911 {
912 struct nfit_mem *nfit_mem;
913
914 list_for_each_entry(nfit_mem, &acpi_desc->dimms, list)
915 if (__to_nfit_memdev(nfit_mem)->device_handle == device_handle)
916 return nfit_mem->nvdimm;
917
918 return NULL;
919 }
920
921 static int acpi_nfit_add_dimm(struct acpi_nfit_desc *acpi_desc,
922 struct nfit_mem *nfit_mem, u32 device_handle)
923 {
924 struct acpi_device *adev, *adev_dimm;
925 struct device *dev = acpi_desc->dev;
926 const u8 *uuid = to_nfit_uuid(NFIT_DEV_DIMM);
927 int i;
928
929 /* nfit test assumes 1:1 relationship between commands and dsms */
930 nfit_mem->dsm_mask = acpi_desc->dimm_cmd_force_en;
931 adev = to_acpi_dev(acpi_desc);
932 if (!adev)
933 return 0;
934
935 adev_dimm = acpi_find_child_device(adev, device_handle, false);
936 nfit_mem->adev = adev_dimm;
937 if (!adev_dimm) {
938 dev_err(dev, "no ACPI.NFIT device with _ADR %#x, disabling...\n",
939 device_handle);
940 return force_enable_dimms ? 0 : -ENODEV;
941 }
942
943 for (i = ND_CMD_SMART; i <= ND_CMD_VENDOR; i++)
944 if (acpi_check_dsm(adev_dimm->handle, uuid, 1, 1ULL << i))
945 set_bit(i, &nfit_mem->dsm_mask);
946
947 return 0;
948 }
949
950 static int acpi_nfit_register_dimms(struct acpi_nfit_desc *acpi_desc)
951 {
952 struct nfit_mem *nfit_mem;
953 int dimm_count = 0;
954
955 list_for_each_entry(nfit_mem, &acpi_desc->dimms, list) {
956 struct nvdimm *nvdimm;
957 unsigned long flags = 0;
958 u32 device_handle;
959 u16 mem_flags;
960 int rc;
961
962 device_handle = __to_nfit_memdev(nfit_mem)->device_handle;
963 nvdimm = acpi_nfit_dimm_by_handle(acpi_desc, device_handle);
964 if (nvdimm) {
965 dimm_count++;
966 continue;
967 }
968
969 if (nfit_mem->bdw && nfit_mem->memdev_pmem)
970 flags |= NDD_ALIASING;
971
972 mem_flags = __to_nfit_memdev(nfit_mem)->flags;
973 if (mem_flags & ACPI_NFIT_MEM_NOT_ARMED)
974 flags |= NDD_UNARMED;
975
976 rc = acpi_nfit_add_dimm(acpi_desc, nfit_mem, device_handle);
977 if (rc)
978 continue;
979
980 /*
981 * For now there is 1:1 relationship between cmd_mask and
982 * dsm_mask.
983 */
984 nvdimm = nvdimm_create(acpi_desc->nvdimm_bus, nfit_mem,
985 acpi_nfit_dimm_attribute_groups,
986 flags, nfit_mem->dsm_mask);
987 if (!nvdimm)
988 return -ENOMEM;
989
990 nfit_mem->nvdimm = nvdimm;
991 dimm_count++;
992
993 if ((mem_flags & ACPI_NFIT_MEM_FAILED_MASK) == 0)
994 continue;
995
996 dev_info(acpi_desc->dev, "%s flags:%s%s%s%s\n",
997 nvdimm_name(nvdimm),
998 mem_flags & ACPI_NFIT_MEM_SAVE_FAILED ? " save_fail" : "",
999 mem_flags & ACPI_NFIT_MEM_RESTORE_FAILED ? " restore_fail":"",
1000 mem_flags & ACPI_NFIT_MEM_FLUSH_FAILED ? " flush_fail" : "",
1001 mem_flags & ACPI_NFIT_MEM_NOT_ARMED ? " not_armed" : "");
1002
1003 }
1004
1005 return nvdimm_bus_check_dimm_count(acpi_desc->nvdimm_bus, dimm_count);
1006 }
1007
1008 static void acpi_nfit_init_dsms(struct acpi_nfit_desc *acpi_desc)
1009 {
1010 struct nvdimm_bus_descriptor *nd_desc = &acpi_desc->nd_desc;
1011 const u8 *uuid = to_nfit_uuid(NFIT_DEV_BUS);
1012 struct acpi_device *adev;
1013 int i;
1014
1015 nd_desc->cmd_mask = acpi_desc->bus_cmd_force_en;
1016 adev = to_acpi_dev(acpi_desc);
1017 if (!adev)
1018 return;
1019
1020 for (i = ND_CMD_ARS_CAP; i <= ND_CMD_CLEAR_ERROR; i++)
1021 if (acpi_check_dsm(adev->handle, uuid, 1, 1ULL << i))
1022 set_bit(i, &nd_desc->cmd_mask);
1023 }
1024
1025 static ssize_t range_index_show(struct device *dev,
1026 struct device_attribute *attr, char *buf)
1027 {
1028 struct nd_region *nd_region = to_nd_region(dev);
1029 struct nfit_spa *nfit_spa = nd_region_provider_data(nd_region);
1030
1031 return sprintf(buf, "%d\n", nfit_spa->spa->range_index);
1032 }
1033 static DEVICE_ATTR_RO(range_index);
1034
1035 static struct attribute *acpi_nfit_region_attributes[] = {
1036 &dev_attr_range_index.attr,
1037 NULL,
1038 };
1039
1040 static struct attribute_group acpi_nfit_region_attribute_group = {
1041 .name = "nfit",
1042 .attrs = acpi_nfit_region_attributes,
1043 };
1044
1045 static const struct attribute_group *acpi_nfit_region_attribute_groups[] = {
1046 &nd_region_attribute_group,
1047 &nd_mapping_attribute_group,
1048 &nd_device_attribute_group,
1049 &nd_numa_attribute_group,
1050 &acpi_nfit_region_attribute_group,
1051 NULL,
1052 };
1053
1054 /* enough info to uniquely specify an interleave set */
1055 struct nfit_set_info {
1056 struct nfit_set_info_map {
1057 u64 region_offset;
1058 u32 serial_number;
1059 u32 pad;
1060 } mapping[0];
1061 };
1062
1063 static size_t sizeof_nfit_set_info(int num_mappings)
1064 {
1065 return sizeof(struct nfit_set_info)
1066 + num_mappings * sizeof(struct nfit_set_info_map);
1067 }
1068
1069 static int cmp_map(const void *m0, const void *m1)
1070 {
1071 const struct nfit_set_info_map *map0 = m0;
1072 const struct nfit_set_info_map *map1 = m1;
1073
1074 return memcmp(&map0->region_offset, &map1->region_offset,
1075 sizeof(u64));
1076 }
1077
1078 /* Retrieve the nth entry referencing this spa */
1079 static struct acpi_nfit_memory_map *memdev_from_spa(
1080 struct acpi_nfit_desc *acpi_desc, u16 range_index, int n)
1081 {
1082 struct nfit_memdev *nfit_memdev;
1083
1084 list_for_each_entry(nfit_memdev, &acpi_desc->memdevs, list)
1085 if (nfit_memdev->memdev->range_index == range_index)
1086 if (n-- == 0)
1087 return nfit_memdev->memdev;
1088 return NULL;
1089 }
1090
1091 static int acpi_nfit_init_interleave_set(struct acpi_nfit_desc *acpi_desc,
1092 struct nd_region_desc *ndr_desc,
1093 struct acpi_nfit_system_address *spa)
1094 {
1095 int i, spa_type = nfit_spa_type(spa);
1096 struct device *dev = acpi_desc->dev;
1097 struct nd_interleave_set *nd_set;
1098 u16 nr = ndr_desc->num_mappings;
1099 struct nfit_set_info *info;
1100
1101 if (spa_type == NFIT_SPA_PM || spa_type == NFIT_SPA_VOLATILE)
1102 /* pass */;
1103 else
1104 return 0;
1105
1106 nd_set = devm_kzalloc(dev, sizeof(*nd_set), GFP_KERNEL);
1107 if (!nd_set)
1108 return -ENOMEM;
1109
1110 info = devm_kzalloc(dev, sizeof_nfit_set_info(nr), GFP_KERNEL);
1111 if (!info)
1112 return -ENOMEM;
1113 for (i = 0; i < nr; i++) {
1114 struct nd_mapping *nd_mapping = &ndr_desc->nd_mapping[i];
1115 struct nfit_set_info_map *map = &info->mapping[i];
1116 struct nvdimm *nvdimm = nd_mapping->nvdimm;
1117 struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
1118 struct acpi_nfit_memory_map *memdev = memdev_from_spa(acpi_desc,
1119 spa->range_index, i);
1120
1121 if (!memdev || !nfit_mem->dcr) {
1122 dev_err(dev, "%s: failed to find DCR\n", __func__);
1123 return -ENODEV;
1124 }
1125
1126 map->region_offset = memdev->region_offset;
1127 map->serial_number = nfit_mem->dcr->serial_number;
1128 }
1129
1130 sort(&info->mapping[0], nr, sizeof(struct nfit_set_info_map),
1131 cmp_map, NULL);
1132 nd_set->cookie = nd_fletcher64(info, sizeof_nfit_set_info(nr), 0);
1133 ndr_desc->nd_set = nd_set;
1134 devm_kfree(dev, info);
1135
1136 return 0;
1137 }
1138
1139 static u64 to_interleave_offset(u64 offset, struct nfit_blk_mmio *mmio)
1140 {
1141 struct acpi_nfit_interleave *idt = mmio->idt;
1142 u32 sub_line_offset, line_index, line_offset;
1143 u64 line_no, table_skip_count, table_offset;
1144
1145 line_no = div_u64_rem(offset, mmio->line_size, &sub_line_offset);
1146 table_skip_count = div_u64_rem(line_no, mmio->num_lines, &line_index);
1147 line_offset = idt->line_offset[line_index]
1148 * mmio->line_size;
1149 table_offset = table_skip_count * mmio->table_size;
1150
1151 return mmio->base_offset + line_offset + table_offset + sub_line_offset;
1152 }
1153
1154 static void wmb_blk(struct nfit_blk *nfit_blk)
1155 {
1156
1157 if (nfit_blk->nvdimm_flush) {
1158 /*
1159 * The first wmb() is needed to 'sfence' all previous writes
1160 * such that they are architecturally visible for the platform
1161 * buffer flush. Note that we've already arranged for pmem
1162 * writes to avoid the cache via arch_memcpy_to_pmem(). The
1163 * final wmb() ensures ordering for the NVDIMM flush write.
1164 */
1165 wmb();
1166 writeq(1, nfit_blk->nvdimm_flush);
1167 wmb();
1168 } else
1169 wmb_pmem();
1170 }
1171
1172 static u32 read_blk_stat(struct nfit_blk *nfit_blk, unsigned int bw)
1173 {
1174 struct nfit_blk_mmio *mmio = &nfit_blk->mmio[DCR];
1175 u64 offset = nfit_blk->stat_offset + mmio->size * bw;
1176
1177 if (mmio->num_lines)
1178 offset = to_interleave_offset(offset, mmio);
1179
1180 return readl(mmio->addr.base + offset);
1181 }
1182
1183 static void write_blk_ctl(struct nfit_blk *nfit_blk, unsigned int bw,
1184 resource_size_t dpa, unsigned int len, unsigned int write)
1185 {
1186 u64 cmd, offset;
1187 struct nfit_blk_mmio *mmio = &nfit_blk->mmio[DCR];
1188
1189 enum {
1190 BCW_OFFSET_MASK = (1ULL << 48)-1,
1191 BCW_LEN_SHIFT = 48,
1192 BCW_LEN_MASK = (1ULL << 8) - 1,
1193 BCW_CMD_SHIFT = 56,
1194 };
1195
1196 cmd = (dpa >> L1_CACHE_SHIFT) & BCW_OFFSET_MASK;
1197 len = len >> L1_CACHE_SHIFT;
1198 cmd |= ((u64) len & BCW_LEN_MASK) << BCW_LEN_SHIFT;
1199 cmd |= ((u64) write) << BCW_CMD_SHIFT;
1200
1201 offset = nfit_blk->cmd_offset + mmio->size * bw;
1202 if (mmio->num_lines)
1203 offset = to_interleave_offset(offset, mmio);
1204
1205 writeq(cmd, mmio->addr.base + offset);
1206 wmb_blk(nfit_blk);
1207
1208 if (nfit_blk->dimm_flags & NFIT_BLK_DCR_LATCH)
1209 readq(mmio->addr.base + offset);
1210 }
1211
1212 static int acpi_nfit_blk_single_io(struct nfit_blk *nfit_blk,
1213 resource_size_t dpa, void *iobuf, size_t len, int rw,
1214 unsigned int lane)
1215 {
1216 struct nfit_blk_mmio *mmio = &nfit_blk->mmio[BDW];
1217 unsigned int copied = 0;
1218 u64 base_offset;
1219 int rc;
1220
1221 base_offset = nfit_blk->bdw_offset + dpa % L1_CACHE_BYTES
1222 + lane * mmio->size;
1223 write_blk_ctl(nfit_blk, lane, dpa, len, rw);
1224 while (len) {
1225 unsigned int c;
1226 u64 offset;
1227
1228 if (mmio->num_lines) {
1229 u32 line_offset;
1230
1231 offset = to_interleave_offset(base_offset + copied,
1232 mmio);
1233 div_u64_rem(offset, mmio->line_size, &line_offset);
1234 c = min_t(size_t, len, mmio->line_size - line_offset);
1235 } else {
1236 offset = base_offset + nfit_blk->bdw_offset;
1237 c = len;
1238 }
1239
1240 if (rw)
1241 memcpy_to_pmem(mmio->addr.aperture + offset,
1242 iobuf + copied, c);
1243 else {
1244 if (nfit_blk->dimm_flags & NFIT_BLK_READ_FLUSH)
1245 mmio_flush_range((void __force *)
1246 mmio->addr.aperture + offset, c);
1247
1248 memcpy_from_pmem(iobuf + copied,
1249 mmio->addr.aperture + offset, c);
1250 }
1251
1252 copied += c;
1253 len -= c;
1254 }
1255
1256 if (rw)
1257 wmb_blk(nfit_blk);
1258
1259 rc = read_blk_stat(nfit_blk, lane) ? -EIO : 0;
1260 return rc;
1261 }
1262
1263 static int acpi_nfit_blk_region_do_io(struct nd_blk_region *ndbr,
1264 resource_size_t dpa, void *iobuf, u64 len, int rw)
1265 {
1266 struct nfit_blk *nfit_blk = nd_blk_region_provider_data(ndbr);
1267 struct nfit_blk_mmio *mmio = &nfit_blk->mmio[BDW];
1268 struct nd_region *nd_region = nfit_blk->nd_region;
1269 unsigned int lane, copied = 0;
1270 int rc = 0;
1271
1272 lane = nd_region_acquire_lane(nd_region);
1273 while (len) {
1274 u64 c = min(len, mmio->size);
1275
1276 rc = acpi_nfit_blk_single_io(nfit_blk, dpa + copied,
1277 iobuf + copied, c, rw, lane);
1278 if (rc)
1279 break;
1280
1281 copied += c;
1282 len -= c;
1283 }
1284 nd_region_release_lane(nd_region, lane);
1285
1286 return rc;
1287 }
1288
1289 static void nfit_spa_mapping_release(struct kref *kref)
1290 {
1291 struct nfit_spa_mapping *spa_map = to_spa_map(kref);
1292 struct acpi_nfit_system_address *spa = spa_map->spa;
1293 struct acpi_nfit_desc *acpi_desc = spa_map->acpi_desc;
1294
1295 WARN_ON(!mutex_is_locked(&acpi_desc->spa_map_mutex));
1296 dev_dbg(acpi_desc->dev, "%s: SPA%d\n", __func__, spa->range_index);
1297 if (spa_map->type == SPA_MAP_APERTURE)
1298 memunmap((void __force *)spa_map->addr.aperture);
1299 else
1300 iounmap(spa_map->addr.base);
1301 release_mem_region(spa->address, spa->length);
1302 list_del(&spa_map->list);
1303 kfree(spa_map);
1304 }
1305
1306 static struct nfit_spa_mapping *find_spa_mapping(
1307 struct acpi_nfit_desc *acpi_desc,
1308 struct acpi_nfit_system_address *spa)
1309 {
1310 struct nfit_spa_mapping *spa_map;
1311
1312 WARN_ON(!mutex_is_locked(&acpi_desc->spa_map_mutex));
1313 list_for_each_entry(spa_map, &acpi_desc->spa_maps, list)
1314 if (spa_map->spa == spa)
1315 return spa_map;
1316
1317 return NULL;
1318 }
1319
1320 static void nfit_spa_unmap(struct acpi_nfit_desc *acpi_desc,
1321 struct acpi_nfit_system_address *spa)
1322 {
1323 struct nfit_spa_mapping *spa_map;
1324
1325 mutex_lock(&acpi_desc->spa_map_mutex);
1326 spa_map = find_spa_mapping(acpi_desc, spa);
1327
1328 if (spa_map)
1329 kref_put(&spa_map->kref, nfit_spa_mapping_release);
1330 mutex_unlock(&acpi_desc->spa_map_mutex);
1331 }
1332
1333 static void __iomem *__nfit_spa_map(struct acpi_nfit_desc *acpi_desc,
1334 struct acpi_nfit_system_address *spa, enum spa_map_type type)
1335 {
1336 resource_size_t start = spa->address;
1337 resource_size_t n = spa->length;
1338 struct nfit_spa_mapping *spa_map;
1339 struct resource *res;
1340
1341 WARN_ON(!mutex_is_locked(&acpi_desc->spa_map_mutex));
1342
1343 spa_map = find_spa_mapping(acpi_desc, spa);
1344 if (spa_map) {
1345 kref_get(&spa_map->kref);
1346 return spa_map->addr.base;
1347 }
1348
1349 spa_map = kzalloc(sizeof(*spa_map), GFP_KERNEL);
1350 if (!spa_map)
1351 return NULL;
1352
1353 INIT_LIST_HEAD(&spa_map->list);
1354 spa_map->spa = spa;
1355 kref_init(&spa_map->kref);
1356 spa_map->acpi_desc = acpi_desc;
1357
1358 res = request_mem_region(start, n, dev_name(acpi_desc->dev));
1359 if (!res)
1360 goto err_mem;
1361
1362 spa_map->type = type;
1363 if (type == SPA_MAP_APERTURE)
1364 spa_map->addr.aperture = (void __pmem *)memremap(start, n,
1365 ARCH_MEMREMAP_PMEM);
1366 else
1367 spa_map->addr.base = ioremap_nocache(start, n);
1368
1369
1370 if (!spa_map->addr.base)
1371 goto err_map;
1372
1373 list_add_tail(&spa_map->list, &acpi_desc->spa_maps);
1374 return spa_map->addr.base;
1375
1376 err_map:
1377 release_mem_region(start, n);
1378 err_mem:
1379 kfree(spa_map);
1380 return NULL;
1381 }
1382
1383 /**
1384 * nfit_spa_map - interleave-aware managed-mappings of acpi_nfit_system_address ranges
1385 * @nvdimm_bus: NFIT-bus that provided the spa table entry
1386 * @nfit_spa: spa table to map
1387 * @type: aperture or control region
1388 *
1389 * In the case where block-data-window apertures and
1390 * dimm-control-regions are interleaved they will end up sharing a
1391 * single request_mem_region() + ioremap() for the address range. In
1392 * the style of devm nfit_spa_map() mappings are automatically dropped
1393 * when all region devices referencing the same mapping are disabled /
1394 * unbound.
1395 */
1396 static void __iomem *nfit_spa_map(struct acpi_nfit_desc *acpi_desc,
1397 struct acpi_nfit_system_address *spa, enum spa_map_type type)
1398 {
1399 void __iomem *iomem;
1400
1401 mutex_lock(&acpi_desc->spa_map_mutex);
1402 iomem = __nfit_spa_map(acpi_desc, spa, type);
1403 mutex_unlock(&acpi_desc->spa_map_mutex);
1404
1405 return iomem;
1406 }
1407
1408 static int nfit_blk_init_interleave(struct nfit_blk_mmio *mmio,
1409 struct acpi_nfit_interleave *idt, u16 interleave_ways)
1410 {
1411 if (idt) {
1412 mmio->num_lines = idt->line_count;
1413 mmio->line_size = idt->line_size;
1414 if (interleave_ways == 0)
1415 return -ENXIO;
1416 mmio->table_size = mmio->num_lines * interleave_ways
1417 * mmio->line_size;
1418 }
1419
1420 return 0;
1421 }
1422
1423 static int acpi_nfit_blk_get_flags(struct nvdimm_bus_descriptor *nd_desc,
1424 struct nvdimm *nvdimm, struct nfit_blk *nfit_blk)
1425 {
1426 struct nd_cmd_dimm_flags flags;
1427 int rc;
1428
1429 memset(&flags, 0, sizeof(flags));
1430 rc = nd_desc->ndctl(nd_desc, nvdimm, ND_CMD_DIMM_FLAGS, &flags,
1431 sizeof(flags), NULL);
1432
1433 if (rc >= 0 && flags.status == 0)
1434 nfit_blk->dimm_flags = flags.flags;
1435 else if (rc == -ENOTTY) {
1436 /* fall back to a conservative default */
1437 nfit_blk->dimm_flags = NFIT_BLK_DCR_LATCH | NFIT_BLK_READ_FLUSH;
1438 rc = 0;
1439 } else
1440 rc = -ENXIO;
1441
1442 return rc;
1443 }
1444
1445 static int acpi_nfit_blk_region_enable(struct nvdimm_bus *nvdimm_bus,
1446 struct device *dev)
1447 {
1448 struct nvdimm_bus_descriptor *nd_desc = to_nd_desc(nvdimm_bus);
1449 struct acpi_nfit_desc *acpi_desc = to_acpi_desc(nd_desc);
1450 struct nd_blk_region *ndbr = to_nd_blk_region(dev);
1451 struct nfit_flush *nfit_flush;
1452 struct nfit_blk_mmio *mmio;
1453 struct nfit_blk *nfit_blk;
1454 struct nfit_mem *nfit_mem;
1455 struct nvdimm *nvdimm;
1456 int rc;
1457
1458 nvdimm = nd_blk_region_to_dimm(ndbr);
1459 nfit_mem = nvdimm_provider_data(nvdimm);
1460 if (!nfit_mem || !nfit_mem->dcr || !nfit_mem->bdw) {
1461 dev_dbg(dev, "%s: missing%s%s%s\n", __func__,
1462 nfit_mem ? "" : " nfit_mem",
1463 (nfit_mem && nfit_mem->dcr) ? "" : " dcr",
1464 (nfit_mem && nfit_mem->bdw) ? "" : " bdw");
1465 return -ENXIO;
1466 }
1467
1468 nfit_blk = devm_kzalloc(dev, sizeof(*nfit_blk), GFP_KERNEL);
1469 if (!nfit_blk)
1470 return -ENOMEM;
1471 nd_blk_region_set_provider_data(ndbr, nfit_blk);
1472 nfit_blk->nd_region = to_nd_region(dev);
1473
1474 /* map block aperture memory */
1475 nfit_blk->bdw_offset = nfit_mem->bdw->offset;
1476 mmio = &nfit_blk->mmio[BDW];
1477 mmio->addr.base = nfit_spa_map(acpi_desc, nfit_mem->spa_bdw,
1478 SPA_MAP_APERTURE);
1479 if (!mmio->addr.base) {
1480 dev_dbg(dev, "%s: %s failed to map bdw\n", __func__,
1481 nvdimm_name(nvdimm));
1482 return -ENOMEM;
1483 }
1484 mmio->size = nfit_mem->bdw->size;
1485 mmio->base_offset = nfit_mem->memdev_bdw->region_offset;
1486 mmio->idt = nfit_mem->idt_bdw;
1487 mmio->spa = nfit_mem->spa_bdw;
1488 rc = nfit_blk_init_interleave(mmio, nfit_mem->idt_bdw,
1489 nfit_mem->memdev_bdw->interleave_ways);
1490 if (rc) {
1491 dev_dbg(dev, "%s: %s failed to init bdw interleave\n",
1492 __func__, nvdimm_name(nvdimm));
1493 return rc;
1494 }
1495
1496 /* map block control memory */
1497 nfit_blk->cmd_offset = nfit_mem->dcr->command_offset;
1498 nfit_blk->stat_offset = nfit_mem->dcr->status_offset;
1499 mmio = &nfit_blk->mmio[DCR];
1500 mmio->addr.base = nfit_spa_map(acpi_desc, nfit_mem->spa_dcr,
1501 SPA_MAP_CONTROL);
1502 if (!mmio->addr.base) {
1503 dev_dbg(dev, "%s: %s failed to map dcr\n", __func__,
1504 nvdimm_name(nvdimm));
1505 return -ENOMEM;
1506 }
1507 mmio->size = nfit_mem->dcr->window_size;
1508 mmio->base_offset = nfit_mem->memdev_dcr->region_offset;
1509 mmio->idt = nfit_mem->idt_dcr;
1510 mmio->spa = nfit_mem->spa_dcr;
1511 rc = nfit_blk_init_interleave(mmio, nfit_mem->idt_dcr,
1512 nfit_mem->memdev_dcr->interleave_ways);
1513 if (rc) {
1514 dev_dbg(dev, "%s: %s failed to init dcr interleave\n",
1515 __func__, nvdimm_name(nvdimm));
1516 return rc;
1517 }
1518
1519 rc = acpi_nfit_blk_get_flags(nd_desc, nvdimm, nfit_blk);
1520 if (rc < 0) {
1521 dev_dbg(dev, "%s: %s failed get DIMM flags\n",
1522 __func__, nvdimm_name(nvdimm));
1523 return rc;
1524 }
1525
1526 nfit_flush = nfit_mem->nfit_flush;
1527 if (nfit_flush && nfit_flush->flush->hint_count != 0) {
1528 nfit_blk->nvdimm_flush = devm_ioremap_nocache(dev,
1529 nfit_flush->flush->hint_address[0], 8);
1530 if (!nfit_blk->nvdimm_flush)
1531 return -ENOMEM;
1532 }
1533
1534 if (!arch_has_wmb_pmem() && !nfit_blk->nvdimm_flush)
1535 dev_warn(dev, "unable to guarantee persistence of writes\n");
1536
1537 if (mmio->line_size == 0)
1538 return 0;
1539
1540 if ((u32) nfit_blk->cmd_offset % mmio->line_size
1541 + 8 > mmio->line_size) {
1542 dev_dbg(dev, "cmd_offset crosses interleave boundary\n");
1543 return -ENXIO;
1544 } else if ((u32) nfit_blk->stat_offset % mmio->line_size
1545 + 8 > mmio->line_size) {
1546 dev_dbg(dev, "stat_offset crosses interleave boundary\n");
1547 return -ENXIO;
1548 }
1549
1550 return 0;
1551 }
1552
1553 static void acpi_nfit_blk_region_disable(struct nvdimm_bus *nvdimm_bus,
1554 struct device *dev)
1555 {
1556 struct nvdimm_bus_descriptor *nd_desc = to_nd_desc(nvdimm_bus);
1557 struct acpi_nfit_desc *acpi_desc = to_acpi_desc(nd_desc);
1558 struct nd_blk_region *ndbr = to_nd_blk_region(dev);
1559 struct nfit_blk *nfit_blk = nd_blk_region_provider_data(ndbr);
1560 int i;
1561
1562 if (!nfit_blk)
1563 return; /* never enabled */
1564
1565 /* auto-free BLK spa mappings */
1566 for (i = 0; i < 2; i++) {
1567 struct nfit_blk_mmio *mmio = &nfit_blk->mmio[i];
1568
1569 if (mmio->addr.base)
1570 nfit_spa_unmap(acpi_desc, mmio->spa);
1571 }
1572 nd_blk_region_set_provider_data(ndbr, NULL);
1573 /* devm will free nfit_blk */
1574 }
1575
1576 static int ars_get_cap(struct acpi_nfit_desc *acpi_desc,
1577 struct nd_cmd_ars_cap *cmd, struct nfit_spa *nfit_spa)
1578 {
1579 struct nvdimm_bus_descriptor *nd_desc = &acpi_desc->nd_desc;
1580 struct acpi_nfit_system_address *spa = nfit_spa->spa;
1581 int cmd_rc, rc;
1582
1583 cmd->address = spa->address;
1584 cmd->length = spa->length;
1585 rc = nd_desc->ndctl(nd_desc, NULL, ND_CMD_ARS_CAP, cmd,
1586 sizeof(*cmd), &cmd_rc);
1587 if (rc < 0)
1588 return rc;
1589 return cmd_rc;
1590 }
1591
1592 static int ars_start(struct acpi_nfit_desc *acpi_desc, struct nfit_spa *nfit_spa)
1593 {
1594 int rc;
1595 int cmd_rc;
1596 struct nd_cmd_ars_start ars_start;
1597 struct acpi_nfit_system_address *spa = nfit_spa->spa;
1598 struct nvdimm_bus_descriptor *nd_desc = &acpi_desc->nd_desc;
1599
1600 memset(&ars_start, 0, sizeof(ars_start));
1601 ars_start.address = spa->address;
1602 ars_start.length = spa->length;
1603 if (nfit_spa_type(spa) == NFIT_SPA_PM)
1604 ars_start.type = ND_ARS_PERSISTENT;
1605 else if (nfit_spa_type(spa) == NFIT_SPA_VOLATILE)
1606 ars_start.type = ND_ARS_VOLATILE;
1607 else
1608 return -ENOTTY;
1609
1610 rc = nd_desc->ndctl(nd_desc, NULL, ND_CMD_ARS_START, &ars_start,
1611 sizeof(ars_start), &cmd_rc);
1612
1613 if (rc < 0)
1614 return rc;
1615 return cmd_rc;
1616 }
1617
1618 static int ars_continue(struct acpi_nfit_desc *acpi_desc)
1619 {
1620 int rc, cmd_rc;
1621 struct nd_cmd_ars_start ars_start;
1622 struct nvdimm_bus_descriptor *nd_desc = &acpi_desc->nd_desc;
1623 struct nd_cmd_ars_status *ars_status = acpi_desc->ars_status;
1624
1625 memset(&ars_start, 0, sizeof(ars_start));
1626 ars_start.address = ars_status->restart_address;
1627 ars_start.length = ars_status->restart_length;
1628 ars_start.type = ars_status->type;
1629 rc = nd_desc->ndctl(nd_desc, NULL, ND_CMD_ARS_START, &ars_start,
1630 sizeof(ars_start), &cmd_rc);
1631 if (rc < 0)
1632 return rc;
1633 return cmd_rc;
1634 }
1635
1636 static int ars_get_status(struct acpi_nfit_desc *acpi_desc)
1637 {
1638 struct nvdimm_bus_descriptor *nd_desc = &acpi_desc->nd_desc;
1639 struct nd_cmd_ars_status *ars_status = acpi_desc->ars_status;
1640 int rc, cmd_rc;
1641
1642 rc = nd_desc->ndctl(nd_desc, NULL, ND_CMD_ARS_STATUS, ars_status,
1643 acpi_desc->ars_status_size, &cmd_rc);
1644 if (rc < 0)
1645 return rc;
1646 return cmd_rc;
1647 }
1648
1649 static int ars_status_process_records(struct nvdimm_bus *nvdimm_bus,
1650 struct nd_cmd_ars_status *ars_status)
1651 {
1652 int rc;
1653 u32 i;
1654
1655 for (i = 0; i < ars_status->num_records; i++) {
1656 rc = nvdimm_bus_add_poison(nvdimm_bus,
1657 ars_status->records[i].err_address,
1658 ars_status->records[i].length);
1659 if (rc)
1660 return rc;
1661 }
1662
1663 return 0;
1664 }
1665
1666 static void acpi_nfit_remove_resource(void *data)
1667 {
1668 struct resource *res = data;
1669
1670 remove_resource(res);
1671 }
1672
1673 static int acpi_nfit_insert_resource(struct acpi_nfit_desc *acpi_desc,
1674 struct nd_region_desc *ndr_desc)
1675 {
1676 struct resource *res, *nd_res = ndr_desc->res;
1677 int is_pmem, ret;
1678
1679 /* No operation if the region is already registered as PMEM */
1680 is_pmem = region_intersects(nd_res->start, resource_size(nd_res),
1681 IORESOURCE_MEM, IORES_DESC_PERSISTENT_MEMORY);
1682 if (is_pmem == REGION_INTERSECTS)
1683 return 0;
1684
1685 res = devm_kzalloc(acpi_desc->dev, sizeof(*res), GFP_KERNEL);
1686 if (!res)
1687 return -ENOMEM;
1688
1689 res->name = "Persistent Memory";
1690 res->start = nd_res->start;
1691 res->end = nd_res->end;
1692 res->flags = IORESOURCE_MEM;
1693 res->desc = IORES_DESC_PERSISTENT_MEMORY;
1694
1695 ret = insert_resource(&iomem_resource, res);
1696 if (ret)
1697 return ret;
1698
1699 ret = devm_add_action(acpi_desc->dev, acpi_nfit_remove_resource, res);
1700 if (ret) {
1701 remove_resource(res);
1702 return ret;
1703 }
1704
1705 return 0;
1706 }
1707
1708 static int acpi_nfit_init_mapping(struct acpi_nfit_desc *acpi_desc,
1709 struct nd_mapping *nd_mapping, struct nd_region_desc *ndr_desc,
1710 struct acpi_nfit_memory_map *memdev,
1711 struct nfit_spa *nfit_spa)
1712 {
1713 struct nvdimm *nvdimm = acpi_nfit_dimm_by_handle(acpi_desc,
1714 memdev->device_handle);
1715 struct acpi_nfit_system_address *spa = nfit_spa->spa;
1716 struct nd_blk_region_desc *ndbr_desc;
1717 struct nfit_mem *nfit_mem;
1718 int blk_valid = 0;
1719
1720 if (!nvdimm) {
1721 dev_err(acpi_desc->dev, "spa%d dimm: %#x not found\n",
1722 spa->range_index, memdev->device_handle);
1723 return -ENODEV;
1724 }
1725
1726 nd_mapping->nvdimm = nvdimm;
1727 switch (nfit_spa_type(spa)) {
1728 case NFIT_SPA_PM:
1729 case NFIT_SPA_VOLATILE:
1730 nd_mapping->start = memdev->address;
1731 nd_mapping->size = memdev->region_size;
1732 break;
1733 case NFIT_SPA_DCR:
1734 nfit_mem = nvdimm_provider_data(nvdimm);
1735 if (!nfit_mem || !nfit_mem->bdw) {
1736 dev_dbg(acpi_desc->dev, "spa%d %s missing bdw\n",
1737 spa->range_index, nvdimm_name(nvdimm));
1738 } else {
1739 nd_mapping->size = nfit_mem->bdw->capacity;
1740 nd_mapping->start = nfit_mem->bdw->start_address;
1741 ndr_desc->num_lanes = nfit_mem->bdw->windows;
1742 blk_valid = 1;
1743 }
1744
1745 ndr_desc->nd_mapping = nd_mapping;
1746 ndr_desc->num_mappings = blk_valid;
1747 ndbr_desc = to_blk_region_desc(ndr_desc);
1748 ndbr_desc->enable = acpi_nfit_blk_region_enable;
1749 ndbr_desc->disable = acpi_nfit_blk_region_disable;
1750 ndbr_desc->do_io = acpi_desc->blk_do_io;
1751 nfit_spa->nd_region = nvdimm_blk_region_create(acpi_desc->nvdimm_bus,
1752 ndr_desc);
1753 if (!nfit_spa->nd_region)
1754 return -ENOMEM;
1755 break;
1756 }
1757
1758 return 0;
1759 }
1760
1761 static int acpi_nfit_register_region(struct acpi_nfit_desc *acpi_desc,
1762 struct nfit_spa *nfit_spa)
1763 {
1764 static struct nd_mapping nd_mappings[ND_MAX_MAPPINGS];
1765 struct acpi_nfit_system_address *spa = nfit_spa->spa;
1766 struct nd_blk_region_desc ndbr_desc;
1767 struct nd_region_desc *ndr_desc;
1768 struct nfit_memdev *nfit_memdev;
1769 struct nvdimm_bus *nvdimm_bus;
1770 struct resource res;
1771 int count = 0, rc;
1772
1773 if (nfit_spa->nd_region)
1774 return 0;
1775
1776 if (spa->range_index == 0) {
1777 dev_dbg(acpi_desc->dev, "%s: detected invalid spa index\n",
1778 __func__);
1779 return 0;
1780 }
1781
1782 memset(&res, 0, sizeof(res));
1783 memset(&nd_mappings, 0, sizeof(nd_mappings));
1784 memset(&ndbr_desc, 0, sizeof(ndbr_desc));
1785 res.start = spa->address;
1786 res.end = res.start + spa->length - 1;
1787 ndr_desc = &ndbr_desc.ndr_desc;
1788 ndr_desc->res = &res;
1789 ndr_desc->provider_data = nfit_spa;
1790 ndr_desc->attr_groups = acpi_nfit_region_attribute_groups;
1791 if (spa->flags & ACPI_NFIT_PROXIMITY_VALID)
1792 ndr_desc->numa_node = acpi_map_pxm_to_online_node(
1793 spa->proximity_domain);
1794 else
1795 ndr_desc->numa_node = NUMA_NO_NODE;
1796
1797 list_for_each_entry(nfit_memdev, &acpi_desc->memdevs, list) {
1798 struct acpi_nfit_memory_map *memdev = nfit_memdev->memdev;
1799 struct nd_mapping *nd_mapping;
1800
1801 if (memdev->range_index != spa->range_index)
1802 continue;
1803 if (count >= ND_MAX_MAPPINGS) {
1804 dev_err(acpi_desc->dev, "spa%d exceeds max mappings %d\n",
1805 spa->range_index, ND_MAX_MAPPINGS);
1806 return -ENXIO;
1807 }
1808 nd_mapping = &nd_mappings[count++];
1809 rc = acpi_nfit_init_mapping(acpi_desc, nd_mapping, ndr_desc,
1810 memdev, nfit_spa);
1811 if (rc)
1812 goto out;
1813 }
1814
1815 ndr_desc->nd_mapping = nd_mappings;
1816 ndr_desc->num_mappings = count;
1817 rc = acpi_nfit_init_interleave_set(acpi_desc, ndr_desc, spa);
1818 if (rc)
1819 goto out;
1820
1821 nvdimm_bus = acpi_desc->nvdimm_bus;
1822 if (nfit_spa_type(spa) == NFIT_SPA_PM) {
1823 rc = acpi_nfit_insert_resource(acpi_desc, ndr_desc);
1824 if (rc) {
1825 dev_warn(acpi_desc->dev,
1826 "failed to insert pmem resource to iomem: %d\n",
1827 rc);
1828 goto out;
1829 }
1830
1831 nfit_spa->nd_region = nvdimm_pmem_region_create(nvdimm_bus,
1832 ndr_desc);
1833 if (!nfit_spa->nd_region)
1834 rc = -ENOMEM;
1835 } else if (nfit_spa_type(spa) == NFIT_SPA_VOLATILE) {
1836 nfit_spa->nd_region = nvdimm_volatile_region_create(nvdimm_bus,
1837 ndr_desc);
1838 if (!nfit_spa->nd_region)
1839 rc = -ENOMEM;
1840 }
1841
1842 out:
1843 if (rc)
1844 dev_err(acpi_desc->dev, "failed to register spa range %d\n",
1845 nfit_spa->spa->range_index);
1846 return rc;
1847 }
1848
1849 static int ars_status_alloc(struct acpi_nfit_desc *acpi_desc,
1850 u32 max_ars)
1851 {
1852 struct device *dev = acpi_desc->dev;
1853 struct nd_cmd_ars_status *ars_status;
1854
1855 if (acpi_desc->ars_status && acpi_desc->ars_status_size >= max_ars) {
1856 memset(acpi_desc->ars_status, 0, acpi_desc->ars_status_size);
1857 return 0;
1858 }
1859
1860 if (acpi_desc->ars_status)
1861 devm_kfree(dev, acpi_desc->ars_status);
1862 acpi_desc->ars_status = NULL;
1863 ars_status = devm_kzalloc(dev, max_ars, GFP_KERNEL);
1864 if (!ars_status)
1865 return -ENOMEM;
1866 acpi_desc->ars_status = ars_status;
1867 acpi_desc->ars_status_size = max_ars;
1868 return 0;
1869 }
1870
1871 static int acpi_nfit_query_poison(struct acpi_nfit_desc *acpi_desc,
1872 struct nfit_spa *nfit_spa)
1873 {
1874 struct acpi_nfit_system_address *spa = nfit_spa->spa;
1875 int rc;
1876
1877 if (!nfit_spa->max_ars) {
1878 struct nd_cmd_ars_cap ars_cap;
1879
1880 memset(&ars_cap, 0, sizeof(ars_cap));
1881 rc = ars_get_cap(acpi_desc, &ars_cap, nfit_spa);
1882 if (rc < 0)
1883 return rc;
1884 nfit_spa->max_ars = ars_cap.max_ars_out;
1885 nfit_spa->clear_err_unit = ars_cap.clear_err_unit;
1886 /* check that the supported scrub types match the spa type */
1887 if (nfit_spa_type(spa) == NFIT_SPA_VOLATILE &&
1888 ((ars_cap.status >> 16) & ND_ARS_VOLATILE) == 0)
1889 return -ENOTTY;
1890 else if (nfit_spa_type(spa) == NFIT_SPA_PM &&
1891 ((ars_cap.status >> 16) & ND_ARS_PERSISTENT) == 0)
1892 return -ENOTTY;
1893 }
1894
1895 if (ars_status_alloc(acpi_desc, nfit_spa->max_ars))
1896 return -ENOMEM;
1897
1898 rc = ars_get_status(acpi_desc);
1899 if (rc < 0 && rc != -ENOSPC)
1900 return rc;
1901
1902 if (ars_status_process_records(acpi_desc->nvdimm_bus,
1903 acpi_desc->ars_status))
1904 return -ENOMEM;
1905
1906 return 0;
1907 }
1908
1909 static void acpi_nfit_async_scrub(struct acpi_nfit_desc *acpi_desc,
1910 struct nfit_spa *nfit_spa)
1911 {
1912 struct acpi_nfit_system_address *spa = nfit_spa->spa;
1913 unsigned int overflow_retry = scrub_overflow_abort;
1914 u64 init_ars_start = 0, init_ars_len = 0;
1915 struct device *dev = acpi_desc->dev;
1916 unsigned int tmo = scrub_timeout;
1917 int rc;
1918
1919 if (nfit_spa->ars_done || !nfit_spa->nd_region)
1920 return;
1921
1922 rc = ars_start(acpi_desc, nfit_spa);
1923 /*
1924 * If we timed out the initial scan we'll still be busy here,
1925 * and will wait another timeout before giving up permanently.
1926 */
1927 if (rc < 0 && rc != -EBUSY)
1928 return;
1929
1930 do {
1931 u64 ars_start, ars_len;
1932
1933 if (acpi_desc->cancel)
1934 break;
1935 rc = acpi_nfit_query_poison(acpi_desc, nfit_spa);
1936 if (rc == -ENOTTY)
1937 break;
1938 if (rc == -EBUSY && !tmo) {
1939 dev_warn(dev, "range %d ars timeout, aborting\n",
1940 spa->range_index);
1941 break;
1942 }
1943
1944 if (rc == -EBUSY) {
1945 /*
1946 * Note, entries may be appended to the list
1947 * while the lock is dropped, but the workqueue
1948 * being active prevents entries being deleted /
1949 * freed.
1950 */
1951 mutex_unlock(&acpi_desc->init_mutex);
1952 ssleep(1);
1953 tmo--;
1954 mutex_lock(&acpi_desc->init_mutex);
1955 continue;
1956 }
1957
1958 /* we got some results, but there are more pending... */
1959 if (rc == -ENOSPC && overflow_retry--) {
1960 if (!init_ars_len) {
1961 init_ars_len = acpi_desc->ars_status->length;
1962 init_ars_start = acpi_desc->ars_status->address;
1963 }
1964 rc = ars_continue(acpi_desc);
1965 }
1966
1967 if (rc < 0) {
1968 dev_warn(dev, "range %d ars continuation failed\n",
1969 spa->range_index);
1970 break;
1971 }
1972
1973 if (init_ars_len) {
1974 ars_start = init_ars_start;
1975 ars_len = init_ars_len;
1976 } else {
1977 ars_start = acpi_desc->ars_status->address;
1978 ars_len = acpi_desc->ars_status->length;
1979 }
1980 dev_dbg(dev, "spa range: %d ars from %#llx + %#llx complete\n",
1981 spa->range_index, ars_start, ars_len);
1982 /* notify the region about new poison entries */
1983 nvdimm_region_notify(nfit_spa->nd_region,
1984 NVDIMM_REVALIDATE_POISON);
1985 break;
1986 } while (1);
1987 }
1988
1989 static void acpi_nfit_scrub(struct work_struct *work)
1990 {
1991 struct device *dev;
1992 u64 init_scrub_length = 0;
1993 struct nfit_spa *nfit_spa;
1994 u64 init_scrub_address = 0;
1995 bool init_ars_done = false;
1996 struct acpi_nfit_desc *acpi_desc;
1997 unsigned int tmo = scrub_timeout;
1998 unsigned int overflow_retry = scrub_overflow_abort;
1999
2000 acpi_desc = container_of(work, typeof(*acpi_desc), work);
2001 dev = acpi_desc->dev;
2002
2003 /*
2004 * We scrub in 2 phases. The first phase waits for any platform
2005 * firmware initiated scrubs to complete and then we go search for the
2006 * affected spa regions to mark them scanned. In the second phase we
2007 * initiate a directed scrub for every range that was not scrubbed in
2008 * phase 1.
2009 */
2010
2011 /* process platform firmware initiated scrubs */
2012 retry:
2013 mutex_lock(&acpi_desc->init_mutex);
2014 list_for_each_entry(nfit_spa, &acpi_desc->spas, list) {
2015 struct nd_cmd_ars_status *ars_status;
2016 struct acpi_nfit_system_address *spa;
2017 u64 ars_start, ars_len;
2018 int rc;
2019
2020 if (acpi_desc->cancel)
2021 break;
2022
2023 if (nfit_spa->nd_region)
2024 continue;
2025
2026 if (init_ars_done) {
2027 /*
2028 * No need to re-query, we're now just
2029 * reconciling all the ranges covered by the
2030 * initial scrub
2031 */
2032 rc = 0;
2033 } else
2034 rc = acpi_nfit_query_poison(acpi_desc, nfit_spa);
2035
2036 if (rc == -ENOTTY) {
2037 /* no ars capability, just register spa and move on */
2038 acpi_nfit_register_region(acpi_desc, nfit_spa);
2039 continue;
2040 }
2041
2042 if (rc == -EBUSY && !tmo) {
2043 /* fallthrough to directed scrub in phase 2 */
2044 dev_warn(dev, "timeout awaiting ars results, continuing...\n");
2045 break;
2046 } else if (rc == -EBUSY) {
2047 mutex_unlock(&acpi_desc->init_mutex);
2048 ssleep(1);
2049 tmo--;
2050 goto retry;
2051 }
2052
2053 /* we got some results, but there are more pending... */
2054 if (rc == -ENOSPC && overflow_retry--) {
2055 ars_status = acpi_desc->ars_status;
2056 /*
2057 * Record the original scrub range, so that we
2058 * can recall all the ranges impacted by the
2059 * initial scrub.
2060 */
2061 if (!init_scrub_length) {
2062 init_scrub_length = ars_status->length;
2063 init_scrub_address = ars_status->address;
2064 }
2065 rc = ars_continue(acpi_desc);
2066 if (rc == 0) {
2067 mutex_unlock(&acpi_desc->init_mutex);
2068 goto retry;
2069 }
2070 }
2071
2072 if (rc < 0) {
2073 /*
2074 * Initial scrub failed, we'll give it one more
2075 * try below...
2076 */
2077 break;
2078 }
2079
2080 /* We got some final results, record completed ranges */
2081 ars_status = acpi_desc->ars_status;
2082 if (init_scrub_length) {
2083 ars_start = init_scrub_address;
2084 ars_len = ars_start + init_scrub_length;
2085 } else {
2086 ars_start = ars_status->address;
2087 ars_len = ars_status->length;
2088 }
2089 spa = nfit_spa->spa;
2090
2091 if (!init_ars_done) {
2092 init_ars_done = true;
2093 dev_dbg(dev, "init scrub %#llx + %#llx complete\n",
2094 ars_start, ars_len);
2095 }
2096 if (ars_start <= spa->address && ars_start + ars_len
2097 >= spa->address + spa->length)
2098 acpi_nfit_register_region(acpi_desc, nfit_spa);
2099 }
2100
2101 /*
2102 * For all the ranges not covered by an initial scrub we still
2103 * want to see if there are errors, but it's ok to discover them
2104 * asynchronously.
2105 */
2106 list_for_each_entry(nfit_spa, &acpi_desc->spas, list) {
2107 /*
2108 * Flag all the ranges that still need scrubbing, but
2109 * register them now to make data available.
2110 */
2111 if (nfit_spa->nd_region)
2112 nfit_spa->ars_done = 1;
2113 else
2114 acpi_nfit_register_region(acpi_desc, nfit_spa);
2115 }
2116
2117 list_for_each_entry(nfit_spa, &acpi_desc->spas, list)
2118 acpi_nfit_async_scrub(acpi_desc, nfit_spa);
2119 mutex_unlock(&acpi_desc->init_mutex);
2120 }
2121
2122 static int acpi_nfit_register_regions(struct acpi_nfit_desc *acpi_desc)
2123 {
2124 struct nfit_spa *nfit_spa;
2125 int rc;
2126
2127 list_for_each_entry(nfit_spa, &acpi_desc->spas, list)
2128 if (nfit_spa_type(nfit_spa->spa) == NFIT_SPA_DCR) {
2129 /* BLK regions don't need to wait for ars results */
2130 rc = acpi_nfit_register_region(acpi_desc, nfit_spa);
2131 if (rc)
2132 return rc;
2133 }
2134
2135 queue_work(nfit_wq, &acpi_desc->work);
2136 return 0;
2137 }
2138
2139 static int acpi_nfit_check_deletions(struct acpi_nfit_desc *acpi_desc,
2140 struct nfit_table_prev *prev)
2141 {
2142 struct device *dev = acpi_desc->dev;
2143
2144 if (!list_empty(&prev->spas) ||
2145 !list_empty(&prev->memdevs) ||
2146 !list_empty(&prev->dcrs) ||
2147 !list_empty(&prev->bdws) ||
2148 !list_empty(&prev->idts) ||
2149 !list_empty(&prev->flushes)) {
2150 dev_err(dev, "new nfit deletes entries (unsupported)\n");
2151 return -ENXIO;
2152 }
2153 return 0;
2154 }
2155
2156 int acpi_nfit_init(struct acpi_nfit_desc *acpi_desc, acpi_size sz)
2157 {
2158 struct device *dev = acpi_desc->dev;
2159 struct nfit_table_prev prev;
2160 const void *end;
2161 u8 *data;
2162 int rc;
2163
2164 mutex_lock(&acpi_desc->init_mutex);
2165
2166 INIT_LIST_HEAD(&prev.spas);
2167 INIT_LIST_HEAD(&prev.memdevs);
2168 INIT_LIST_HEAD(&prev.dcrs);
2169 INIT_LIST_HEAD(&prev.bdws);
2170 INIT_LIST_HEAD(&prev.idts);
2171 INIT_LIST_HEAD(&prev.flushes);
2172
2173 list_cut_position(&prev.spas, &acpi_desc->spas,
2174 acpi_desc->spas.prev);
2175 list_cut_position(&prev.memdevs, &acpi_desc->memdevs,
2176 acpi_desc->memdevs.prev);
2177 list_cut_position(&prev.dcrs, &acpi_desc->dcrs,
2178 acpi_desc->dcrs.prev);
2179 list_cut_position(&prev.bdws, &acpi_desc->bdws,
2180 acpi_desc->bdws.prev);
2181 list_cut_position(&prev.idts, &acpi_desc->idts,
2182 acpi_desc->idts.prev);
2183 list_cut_position(&prev.flushes, &acpi_desc->flushes,
2184 acpi_desc->flushes.prev);
2185
2186 data = (u8 *) acpi_desc->nfit;
2187 end = data + sz;
2188 while (!IS_ERR_OR_NULL(data))
2189 data = add_table(acpi_desc, &prev, data, end);
2190
2191 if (IS_ERR(data)) {
2192 dev_dbg(dev, "%s: nfit table parsing error: %ld\n", __func__,
2193 PTR_ERR(data));
2194 rc = PTR_ERR(data);
2195 goto out_unlock;
2196 }
2197
2198 rc = acpi_nfit_check_deletions(acpi_desc, &prev);
2199 if (rc)
2200 goto out_unlock;
2201
2202 if (nfit_mem_init(acpi_desc) != 0) {
2203 rc = -ENOMEM;
2204 goto out_unlock;
2205 }
2206
2207 acpi_nfit_init_dsms(acpi_desc);
2208
2209 rc = acpi_nfit_register_dimms(acpi_desc);
2210 if (rc)
2211 goto out_unlock;
2212
2213 rc = acpi_nfit_register_regions(acpi_desc);
2214
2215 out_unlock:
2216 mutex_unlock(&acpi_desc->init_mutex);
2217 return rc;
2218 }
2219 EXPORT_SYMBOL_GPL(acpi_nfit_init);
2220
2221 struct acpi_nfit_flush_work {
2222 struct work_struct work;
2223 struct completion cmp;
2224 };
2225
2226 static void flush_probe(struct work_struct *work)
2227 {
2228 struct acpi_nfit_flush_work *flush;
2229
2230 flush = container_of(work, typeof(*flush), work);
2231 complete(&flush->cmp);
2232 }
2233
2234 static int acpi_nfit_flush_probe(struct nvdimm_bus_descriptor *nd_desc)
2235 {
2236 struct acpi_nfit_desc *acpi_desc = to_acpi_nfit_desc(nd_desc);
2237 struct device *dev = acpi_desc->dev;
2238 struct acpi_nfit_flush_work flush;
2239
2240 /* bounce the device lock to flush acpi_nfit_add / acpi_nfit_notify */
2241 device_lock(dev);
2242 device_unlock(dev);
2243
2244 /*
2245 * Scrub work could take 10s of seconds, userspace may give up so we
2246 * need to be interruptible while waiting.
2247 */
2248 INIT_WORK_ONSTACK(&flush.work, flush_probe);
2249 COMPLETION_INITIALIZER_ONSTACK(flush.cmp);
2250 queue_work(nfit_wq, &flush.work);
2251 return wait_for_completion_interruptible(&flush.cmp);
2252 }
2253
2254 static int acpi_nfit_clear_to_send(struct nvdimm_bus_descriptor *nd_desc,
2255 struct nvdimm *nvdimm, unsigned int cmd)
2256 {
2257 struct acpi_nfit_desc *acpi_desc = to_acpi_nfit_desc(nd_desc);
2258
2259 if (nvdimm)
2260 return 0;
2261 if (cmd != ND_CMD_ARS_START)
2262 return 0;
2263
2264 /*
2265 * The kernel and userspace may race to initiate a scrub, but
2266 * the scrub thread is prepared to lose that initial race. It
2267 * just needs guarantees that any ars it initiates are not
2268 * interrupted by any intervening start reqeusts from userspace.
2269 */
2270 if (work_busy(&acpi_desc->work))
2271 return -EBUSY;
2272
2273 return 0;
2274 }
2275
2276 void acpi_nfit_desc_init(struct acpi_nfit_desc *acpi_desc, struct device *dev)
2277 {
2278 struct nvdimm_bus_descriptor *nd_desc;
2279
2280 dev_set_drvdata(dev, acpi_desc);
2281 acpi_desc->dev = dev;
2282 acpi_desc->blk_do_io = acpi_nfit_blk_region_do_io;
2283 nd_desc = &acpi_desc->nd_desc;
2284 nd_desc->provider_name = "ACPI.NFIT";
2285 nd_desc->ndctl = acpi_nfit_ctl;
2286 nd_desc->flush_probe = acpi_nfit_flush_probe;
2287 nd_desc->clear_to_send = acpi_nfit_clear_to_send;
2288 nd_desc->attr_groups = acpi_nfit_attribute_groups;
2289
2290 INIT_LIST_HEAD(&acpi_desc->spa_maps);
2291 INIT_LIST_HEAD(&acpi_desc->spas);
2292 INIT_LIST_HEAD(&acpi_desc->dcrs);
2293 INIT_LIST_HEAD(&acpi_desc->bdws);
2294 INIT_LIST_HEAD(&acpi_desc->idts);
2295 INIT_LIST_HEAD(&acpi_desc->flushes);
2296 INIT_LIST_HEAD(&acpi_desc->memdevs);
2297 INIT_LIST_HEAD(&acpi_desc->dimms);
2298 mutex_init(&acpi_desc->spa_map_mutex);
2299 mutex_init(&acpi_desc->init_mutex);
2300 INIT_WORK(&acpi_desc->work, acpi_nfit_scrub);
2301 }
2302 EXPORT_SYMBOL_GPL(acpi_nfit_desc_init);
2303
2304 static int acpi_nfit_add(struct acpi_device *adev)
2305 {
2306 struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL };
2307 struct acpi_nfit_desc *acpi_desc;
2308 struct device *dev = &adev->dev;
2309 struct acpi_table_header *tbl;
2310 acpi_status status = AE_OK;
2311 acpi_size sz;
2312 int rc;
2313
2314 status = acpi_get_table_with_size("NFIT", 0, &tbl, &sz);
2315 if (ACPI_FAILURE(status)) {
2316 /* This is ok, we could have an nvdimm hotplugged later */
2317 dev_dbg(dev, "failed to find NFIT at startup\n");
2318 return 0;
2319 }
2320
2321 acpi_desc = devm_kzalloc(dev, sizeof(*acpi_desc), GFP_KERNEL);
2322 if (!acpi_desc)
2323 return -ENOMEM;
2324 acpi_nfit_desc_init(acpi_desc, &adev->dev);
2325 acpi_desc->nvdimm_bus = nvdimm_bus_register(dev, &acpi_desc->nd_desc);
2326 if (!acpi_desc->nvdimm_bus)
2327 return -ENOMEM;
2328
2329 /*
2330 * Save the acpi header for later and then skip it,
2331 * making nfit point to the first nfit table header.
2332 */
2333 acpi_desc->acpi_header = *tbl;
2334 acpi_desc->nfit = (void *) tbl + sizeof(struct acpi_table_nfit);
2335 sz -= sizeof(struct acpi_table_nfit);
2336
2337 /* Evaluate _FIT and override with that if present */
2338 status = acpi_evaluate_object(adev->handle, "_FIT", NULL, &buf);
2339 if (ACPI_SUCCESS(status) && buf.length > 0) {
2340 union acpi_object *obj;
2341 /*
2342 * Adjust for the acpi_object header of the _FIT
2343 */
2344 obj = buf.pointer;
2345 if (obj->type == ACPI_TYPE_BUFFER) {
2346 acpi_desc->nfit =
2347 (struct acpi_nfit_header *)obj->buffer.pointer;
2348 sz = obj->buffer.length;
2349 } else
2350 dev_dbg(dev, "%s invalid type %d, ignoring _FIT\n",
2351 __func__, (int) obj->type);
2352 }
2353
2354 rc = acpi_nfit_init(acpi_desc, sz);
2355 if (rc) {
2356 nvdimm_bus_unregister(acpi_desc->nvdimm_bus);
2357 return rc;
2358 }
2359 return 0;
2360 }
2361
2362 static int acpi_nfit_remove(struct acpi_device *adev)
2363 {
2364 struct acpi_nfit_desc *acpi_desc = dev_get_drvdata(&adev->dev);
2365
2366 acpi_desc->cancel = 1;
2367 flush_workqueue(nfit_wq);
2368 nvdimm_bus_unregister(acpi_desc->nvdimm_bus);
2369 return 0;
2370 }
2371
2372 static void acpi_nfit_notify(struct acpi_device *adev, u32 event)
2373 {
2374 struct acpi_nfit_desc *acpi_desc = dev_get_drvdata(&adev->dev);
2375 struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL };
2376 struct acpi_nfit_header *nfit_saved;
2377 union acpi_object *obj;
2378 struct device *dev = &adev->dev;
2379 acpi_status status;
2380 int ret;
2381
2382 dev_dbg(dev, "%s: event: %d\n", __func__, event);
2383
2384 device_lock(dev);
2385 if (!dev->driver) {
2386 /* dev->driver may be null if we're being removed */
2387 dev_dbg(dev, "%s: no driver found for dev\n", __func__);
2388 goto out_unlock;
2389 }
2390
2391 if (!acpi_desc) {
2392 acpi_desc = devm_kzalloc(dev, sizeof(*acpi_desc), GFP_KERNEL);
2393 if (!acpi_desc)
2394 goto out_unlock;
2395 acpi_nfit_desc_init(acpi_desc, &adev->dev);
2396 acpi_desc->nvdimm_bus = nvdimm_bus_register(dev, &acpi_desc->nd_desc);
2397 if (!acpi_desc->nvdimm_bus)
2398 goto out_unlock;
2399 } else {
2400 /*
2401 * Finish previous registration before considering new
2402 * regions.
2403 */
2404 flush_workqueue(nfit_wq);
2405 }
2406
2407 /* Evaluate _FIT */
2408 status = acpi_evaluate_object(adev->handle, "_FIT", NULL, &buf);
2409 if (ACPI_FAILURE(status)) {
2410 dev_err(dev, "failed to evaluate _FIT\n");
2411 goto out_unlock;
2412 }
2413
2414 nfit_saved = acpi_desc->nfit;
2415 obj = buf.pointer;
2416 if (obj->type == ACPI_TYPE_BUFFER) {
2417 acpi_desc->nfit =
2418 (struct acpi_nfit_header *)obj->buffer.pointer;
2419 ret = acpi_nfit_init(acpi_desc, obj->buffer.length);
2420 if (ret) {
2421 /* Merge failed, restore old nfit, and exit */
2422 acpi_desc->nfit = nfit_saved;
2423 dev_err(dev, "failed to merge updated NFIT\n");
2424 }
2425 } else {
2426 /* Bad _FIT, restore old nfit */
2427 dev_err(dev, "Invalid _FIT\n");
2428 }
2429 kfree(buf.pointer);
2430
2431 out_unlock:
2432 device_unlock(dev);
2433 }
2434
2435 static const struct acpi_device_id acpi_nfit_ids[] = {
2436 { "ACPI0012", 0 },
2437 { "", 0 },
2438 };
2439 MODULE_DEVICE_TABLE(acpi, acpi_nfit_ids);
2440
2441 static struct acpi_driver acpi_nfit_driver = {
2442 .name = KBUILD_MODNAME,
2443 .ids = acpi_nfit_ids,
2444 .ops = {
2445 .add = acpi_nfit_add,
2446 .remove = acpi_nfit_remove,
2447 .notify = acpi_nfit_notify,
2448 },
2449 };
2450
2451 static __init int nfit_init(void)
2452 {
2453 BUILD_BUG_ON(sizeof(struct acpi_table_nfit) != 40);
2454 BUILD_BUG_ON(sizeof(struct acpi_nfit_system_address) != 56);
2455 BUILD_BUG_ON(sizeof(struct acpi_nfit_memory_map) != 48);
2456 BUILD_BUG_ON(sizeof(struct acpi_nfit_interleave) != 20);
2457 BUILD_BUG_ON(sizeof(struct acpi_nfit_smbios) != 9);
2458 BUILD_BUG_ON(sizeof(struct acpi_nfit_control_region) != 80);
2459 BUILD_BUG_ON(sizeof(struct acpi_nfit_data_region) != 40);
2460
2461 acpi_str_to_uuid(UUID_VOLATILE_MEMORY, nfit_uuid[NFIT_SPA_VOLATILE]);
2462 acpi_str_to_uuid(UUID_PERSISTENT_MEMORY, nfit_uuid[NFIT_SPA_PM]);
2463 acpi_str_to_uuid(UUID_CONTROL_REGION, nfit_uuid[NFIT_SPA_DCR]);
2464 acpi_str_to_uuid(UUID_DATA_REGION, nfit_uuid[NFIT_SPA_BDW]);
2465 acpi_str_to_uuid(UUID_VOLATILE_VIRTUAL_DISK, nfit_uuid[NFIT_SPA_VDISK]);
2466 acpi_str_to_uuid(UUID_VOLATILE_VIRTUAL_CD, nfit_uuid[NFIT_SPA_VCD]);
2467 acpi_str_to_uuid(UUID_PERSISTENT_VIRTUAL_DISK, nfit_uuid[NFIT_SPA_PDISK]);
2468 acpi_str_to_uuid(UUID_PERSISTENT_VIRTUAL_CD, nfit_uuid[NFIT_SPA_PCD]);
2469 acpi_str_to_uuid(UUID_NFIT_BUS, nfit_uuid[NFIT_DEV_BUS]);
2470 acpi_str_to_uuid(UUID_NFIT_DIMM, nfit_uuid[NFIT_DEV_DIMM]);
2471
2472 nfit_wq = create_singlethread_workqueue("nfit");
2473 if (!nfit_wq)
2474 return -ENOMEM;
2475
2476 return acpi_bus_register_driver(&acpi_nfit_driver);
2477 }
2478
2479 static __exit void nfit_exit(void)
2480 {
2481 acpi_bus_unregister_driver(&acpi_nfit_driver);
2482 destroy_workqueue(nfit_wq);
2483 }
2484
2485 module_init(nfit_init);
2486 module_exit(nfit_exit);
2487 MODULE_LICENSE("GPL v2");
2488 MODULE_AUTHOR("Intel Corporation");
Linux kernel - Deliverables
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