]> git.proxmox.com Git - mirror_ubuntu-focal-kernel.git/blame - drivers/acpi/nfit/core.c
projects / mirror_ubuntu-focal-kernel.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
nfit, libnvdimm, region: export 'position' in mapping info
[mirror_ubuntu-focal-kernel.git] / drivers / acpi / nfit / core.c
CommitLineData
b94d5230
DW		 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>
047fc8a1 16#include <linux/mutex.h>
62232e45 17#include <linux/ndctl.h>
37b137ff 18#include <linux/sysfs.h>
0caeef63 19#include <linux/delay.h>
b94d5230
DW		 20#include <linux/list.h>
21#include <linux/acpi.h>
eaf96153 22#include <linux/sort.h>
047fc8a1 23#include <linux/io.h>
1cf03c00 24#include <linux/nd.h>
96601adb 25#include <asm/cacheflush.h>
b94d5230
DW		 26#include "nfit.h"
27
047fc8a1
RZ		 28/*
29 * For readq() and writeq() on 32-bit builds, the hi-lo, lo-hi order is
30 * irrelevant.
31 */
2f8e2c87 32#include <linux/io-64-nonatomic-hi-lo.h>
047fc8a1 33
4d88a97a
DW		 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
1cf03c00
DW		 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
87554098
DW		 48static bool disable_vendor_specific;
49module_param(disable_vendor_specific, bool, S_IRUGO);
50MODULE_PARM_DESC(disable_vendor_specific,
f2668fa7 51 "Limit commands to the publicly specified set");
87554098 52
095ab4b3
LK		 53static unsigned long override_dsm_mask;
54module_param(override_dsm_mask, ulong, S_IRUGO);
55MODULE_PARM_DESC(override_dsm_mask, "Bitmask of allowed NVDIMM DSM functions");
56
ba650cfc
LK		 57static int default_dsm_family = -1;
58module_param(default_dsm_family, int, S_IRUGO);
59MODULE_PARM_DESC(default_dsm_family,
60 "Try this DSM type first when identifying NVDIMM family");
61
6839a6d9
VV		 62LIST_HEAD(acpi_descs);
63DEFINE_MUTEX(acpi_desc_lock);
64
7ae0fa43
DW		 65static struct workqueue_struct *nfit_wq;
66
20985164
VV		 67struct nfit_table_prev {
68 struct list_head spas;
69 struct list_head memdevs;
70 struct list_head dcrs;
71 struct list_head bdws;
72 struct list_head idts;
73 struct list_head flushes;
74};
75
41c8bdb3 76static guid_t nfit_uuid[NFIT_UUID_MAX];
b94d5230 77
41c8bdb3 78const guid_t *to_nfit_uuid(enum nfit_uuids id)
b94d5230 79{
41c8bdb3 80 return &nfit_uuid[id];
b94d5230 81}
6bc75619 82EXPORT_SYMBOL(to_nfit_uuid);
b94d5230 83
62232e45
DW		 84static struct acpi_nfit_desc *to_acpi_nfit_desc(
85 struct nvdimm_bus_descriptor *nd_desc)
86{
87 return container_of(nd_desc, struct acpi_nfit_desc, nd_desc);
88}
89
90static struct acpi_device *to_acpi_dev(struct acpi_nfit_desc *acpi_desc)
91{
92 struct nvdimm_bus_descriptor *nd_desc = &acpi_desc->nd_desc;
93
94 /*
95 * If provider == 'ACPI.NFIT' we can assume 'dev' is a struct
96 * acpi_device.
97 */
98 if (!nd_desc->provider_name
99 || strcmp(nd_desc->provider_name, "ACPI.NFIT") != 0)
100 return NULL;
101
102 return to_acpi_device(acpi_desc->dev);
103}
104
d6eb270c 105static int xlat_bus_status(void *buf, unsigned int cmd, u32 status)
aef25338 106{
d4f32367 107 struct nd_cmd_clear_error *clear_err;
aef25338 108 struct nd_cmd_ars_status *ars_status;
aef25338
DW		 109 u16 flags;
110
111 switch (cmd) {
112 case ND_CMD_ARS_CAP:
11294d63 113 if ((status & 0xffff) == NFIT_ARS_CAP_NONE)
aef25338
DW		 114 return -ENOTTY;
115
116 /* Command failed */
11294d63 117 if (status & 0xffff)
aef25338
DW		 118 return -EIO;
119
120 /* No supported scan types for this range */
121 flags = ND_ARS_PERSISTENT | ND_ARS_VOLATILE;
11294d63 122 if ((status >> 16 & flags) == 0)
aef25338 123 return -ENOTTY;
9a901f54 124 return 0;
aef25338 125 case ND_CMD_ARS_START:
aef25338 126 /* ARS is in progress */
11294d63 127 if ((status & 0xffff) == NFIT_ARS_START_BUSY)
aef25338
DW		 128 return -EBUSY;
129
130 /* Command failed */
11294d63 131 if (status & 0xffff)
aef25338 132 return -EIO;
9a901f54 133 return 0;
aef25338
DW		 134 case ND_CMD_ARS_STATUS:
135 ars_status = buf;
136 /* Command failed */
11294d63 137 if (status & 0xffff)
aef25338
DW		 138 return -EIO;
139 /* Check extended status (Upper two bytes) */
11294d63 140 if (status == NFIT_ARS_STATUS_DONE)
aef25338
DW		 141 return 0;
142
143 /* ARS is in progress */
11294d63 144 if (status == NFIT_ARS_STATUS_BUSY)
aef25338
DW		 145 return -EBUSY;
146
147 /* No ARS performed for the current boot */
11294d63 148 if (status == NFIT_ARS_STATUS_NONE)
aef25338
DW		 149 return -EAGAIN;
150
151 /*
152 * ARS interrupted, either we overflowed or some other
153 * agent wants the scan to stop. If we didn't overflow
154 * then just continue with the returned results.
155 */
11294d63 156 if (status == NFIT_ARS_STATUS_INTR) {
82aa37cf
DW		 157 if (ars_status->out_length >= 40 && (ars_status->flags
158 & NFIT_ARS_F_OVERFLOW))
aef25338
DW		 159 return -ENOSPC;
160 return 0;
161 }
162
163 /* Unknown status */
11294d63 164 if (status >> 16)
aef25338 165 return -EIO;
9a901f54 166 return 0;
d4f32367
DW		 167 case ND_CMD_CLEAR_ERROR:
168 clear_err = buf;
11294d63 169 if (status & 0xffff)
d4f32367
DW		 170 return -EIO;
171 if (!clear_err->cleared)
172 return -EIO;
173 if (clear_err->length > clear_err->cleared)
174 return clear_err->cleared;
9a901f54 175 return 0;
aef25338
DW		 176 default:
177 break;
178 }
179
11294d63
DW		 180 /* all other non-zero status results in an error */
181 if (status)
182 return -EIO;
aef25338
DW		 183 return 0;
184}
185
9d62ed96
DW		 186static int xlat_nvdimm_status(void *buf, unsigned int cmd, u32 status)
187{
188 switch (cmd) {
189 case ND_CMD_GET_CONFIG_SIZE:
190 if (status >> 16 & ND_CONFIG_LOCKED)
191 return -EACCES;
192 break;
193 default:
194 break;
195 }
196
197 /* all other non-zero status results in an error */
198 if (status)
199 return -EIO;
200 return 0;
201}
202
d6eb270c
DW		 203static int xlat_status(struct nvdimm *nvdimm, void *buf, unsigned int cmd,
204 u32 status)
205{
206 if (!nvdimm)
207 return xlat_bus_status(buf, cmd, status);
9d62ed96 208 return xlat_nvdimm_status(buf, cmd, status);
d6eb270c
DW		 209}
210
a7de92da
DW		 211int acpi_nfit_ctl(struct nvdimm_bus_descriptor *nd_desc, struct nvdimm *nvdimm,
212 unsigned int cmd, void *buf, unsigned int buf_len, int *cmd_rc)
b94d5230 213{
62232e45 214 struct acpi_nfit_desc *acpi_desc = to_acpi_nfit_desc(nd_desc);
62232e45 215 union acpi_object in_obj, in_buf, *out_obj;
31eca76b 216 const struct nd_cmd_desc *desc = NULL;
62232e45 217 struct device *dev = acpi_desc->dev;
31eca76b 218 struct nd_cmd_pkg *call_pkg = NULL;
62232e45 219 const char *cmd_name, *dimm_name;
31eca76b 220 unsigned long cmd_mask, dsm_mask;
11294d63 221 u32 offset, fw_status = 0;
62232e45 222 acpi_handle handle;
31eca76b 223 unsigned int func;
41c8bdb3 224 const guid_t *guid;
62232e45
DW		 225 int rc, i;
226
31eca76b
DW		 227 func = cmd;
228 if (cmd == ND_CMD_CALL) {
229 call_pkg = buf;
230 func = call_pkg->nd_command;
231 }
232
62232e45
DW		 233 if (nvdimm) {
234 struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
235 struct acpi_device *adev = nfit_mem->adev;
236
237 if (!adev)
238 return -ENOTTY;
31eca76b
DW		 239 if (call_pkg && nfit_mem->family != call_pkg->nd_family)
240 return -ENOTTY;
241
047fc8a1 242 dimm_name = nvdimm_name(nvdimm);
62232e45 243 cmd_name = nvdimm_cmd_name(cmd);
e3654eca 244 cmd_mask = nvdimm_cmd_mask(nvdimm);
62232e45
DW		 245 dsm_mask = nfit_mem->dsm_mask;
246 desc = nd_cmd_dimm_desc(cmd);
41c8bdb3 247 guid = to_nfit_uuid(nfit_mem->family);
62232e45
DW		 248 handle = adev->handle;
249 } else {
250 struct acpi_device *adev = to_acpi_dev(acpi_desc);
251
252 cmd_name = nvdimm_bus_cmd_name(cmd);
e3654eca 253 cmd_mask = nd_desc->cmd_mask;
31eca76b 254 dsm_mask = cmd_mask;
7db5bb33
JH		 255 if (cmd == ND_CMD_CALL)
256 dsm_mask = nd_desc->bus_dsm_mask;
62232e45 257 desc = nd_cmd_bus_desc(cmd);
41c8bdb3 258 guid = to_nfit_uuid(NFIT_DEV_BUS);
62232e45
DW		 259 handle = adev->handle;
260 dimm_name = "bus";
261 }
262
263 if (!desc || (cmd && (desc->out_num + desc->in_num == 0)))
264 return -ENOTTY;
265
31eca76b 266 if (!test_bit(cmd, &cmd_mask) || !test_bit(func, &dsm_mask))
62232e45
DW		 267 return -ENOTTY;
268
269 in_obj.type = ACPI_TYPE_PACKAGE;
270 in_obj.package.count = 1;
271 in_obj.package.elements = &in_buf;
272 in_buf.type = ACPI_TYPE_BUFFER;
273 in_buf.buffer.pointer = buf;
274 in_buf.buffer.length = 0;
275
276 /* libnvdimm has already validated the input envelope */
277 for (i = 0; i < desc->in_num; i++)
278 in_buf.buffer.length += nd_cmd_in_size(nvdimm, cmd, desc,
279 i, buf);
280
31eca76b
DW		 281 if (call_pkg) {
282 /* skip over package wrapper */
283 in_buf.buffer.pointer = (void *) &call_pkg->nd_payload;
284 in_buf.buffer.length = call_pkg->nd_size_in;
285 }
286
7699a6a3
DW		 287 dev_dbg(dev, "%s:%s cmd: %d: func: %d input length: %d\n",
288 __func__, dimm_name, cmd, func, in_buf.buffer.length);
289 print_hex_dump_debug("nvdimm in ", DUMP_PREFIX_OFFSET, 4, 4,
31eca76b
DW		 290 in_buf.buffer.pointer,
291 min_t(u32, 256, in_buf.buffer.length), true);
62232e45 292
94116f81 293 out_obj = acpi_evaluate_dsm(handle, guid, 1, func, &in_obj);
62232e45
DW		 294 if (!out_obj) {
295 dev_dbg(dev, "%s:%s _DSM failed cmd: %s\n", __func__, dimm_name,
296 cmd_name);
297 return -EINVAL;
298 }
299
31eca76b
DW		 300 if (call_pkg) {
301 call_pkg->nd_fw_size = out_obj->buffer.length;
302 memcpy(call_pkg->nd_payload + call_pkg->nd_size_in,
303 out_obj->buffer.pointer,
304 min(call_pkg->nd_fw_size, call_pkg->nd_size_out));
305
306 ACPI_FREE(out_obj);
307 /*
308 * Need to support FW function w/o known size in advance.
309 * Caller can determine required size based upon nd_fw_size.
310 * If we return an error (like elsewhere) then caller wouldn't
311 * be able to rely upon data returned to make calculation.
312 */
313 return 0;
314 }
315
62232e45
DW		 316 if (out_obj->package.type != ACPI_TYPE_BUFFER) {
317 dev_dbg(dev, "%s:%s unexpected output object type cmd: %s type: %d\n",
318 __func__, dimm_name, cmd_name, out_obj->type);
319 rc = -EINVAL;
320 goto out;
321 }
322
7699a6a3
DW		 323 dev_dbg(dev, "%s:%s cmd: %s output length: %d\n", __func__, dimm_name,
324 cmd_name, out_obj->buffer.length);
325 print_hex_dump_debug(cmd_name, DUMP_PREFIX_OFFSET, 4, 4,
326 out_obj->buffer.pointer,
327 min_t(u32, 128, out_obj->buffer.length), true);
62232e45
DW		 328
329 for (i = 0, offset = 0; i < desc->out_num; i++) {
330 u32 out_size = nd_cmd_out_size(nvdimm, cmd, desc, i, buf,
efda1b5d
DW		 331 (u32 *) out_obj->buffer.pointer,
332 out_obj->buffer.length - offset);
62232e45
DW		 333
334 if (offset + out_size > out_obj->buffer.length) {
335 dev_dbg(dev, "%s:%s output object underflow cmd: %s field: %d\n",
336 __func__, dimm_name, cmd_name, i);
337 break;
338 }
339
340 if (in_buf.buffer.length + offset + out_size > buf_len) {
341 dev_dbg(dev, "%s:%s output overrun cmd: %s field: %d\n",
342 __func__, dimm_name, cmd_name, i);
343 rc = -ENXIO;
344 goto out;
345 }
346 memcpy(buf + in_buf.buffer.length + offset,
347 out_obj->buffer.pointer + offset, out_size);
348 offset += out_size;
349 }
11294d63
DW		 350
351 /*
352 * Set fw_status for all the commands with a known format to be
353 * later interpreted by xlat_status().
354 */
355 if (i >= 1 && ((cmd >= ND_CMD_ARS_CAP && cmd <= ND_CMD_CLEAR_ERROR)
356 || (cmd >= ND_CMD_SMART && cmd <= ND_CMD_VENDOR)))
357 fw_status = *(u32 *) out_obj->buffer.pointer;
358
62232e45
DW		 359 if (offset + in_buf.buffer.length < buf_len) {
360 if (i >= 1) {
361 /*
362 * status valid, return the number of bytes left
363 * unfilled in the output buffer
364 */
365 rc = buf_len - offset - in_buf.buffer.length;
aef25338 366 if (cmd_rc)
d6eb270c
DW		 367 *cmd_rc = xlat_status(nvdimm, buf, cmd,
368 fw_status);
62232e45
DW		 369 } else {
370 dev_err(dev, "%s:%s underrun cmd: %s buf_len: %d out_len: %d\n",
371 __func__, dimm_name, cmd_name, buf_len,
372 offset);
373 rc = -ENXIO;
374 }
2eea6582 375 } else {
62232e45 376 rc = 0;
2eea6582 377 if (cmd_rc)
d6eb270c 378 *cmd_rc = xlat_status(nvdimm, buf, cmd, fw_status);
2eea6582 379 }
62232e45
DW		 380
381 out:
382 ACPI_FREE(out_obj);
383
384 return rc;
b94d5230 385}
a7de92da 386EXPORT_SYMBOL_GPL(acpi_nfit_ctl);
b94d5230
DW		 387
388static const char *spa_type_name(u16 type)
389{
390 static const char *to_name[] = {
391 [NFIT_SPA_VOLATILE] = "volatile",
392 [NFIT_SPA_PM] = "pmem",
393 [NFIT_SPA_DCR] = "dimm-control-region",
394 [NFIT_SPA_BDW] = "block-data-window",
395 [NFIT_SPA_VDISK] = "volatile-disk",
396 [NFIT_SPA_VCD] = "volatile-cd",
397 [NFIT_SPA_PDISK] = "persistent-disk",
398 [NFIT_SPA_PCD] = "persistent-cd",
399
400 };
401
402 if (type > NFIT_SPA_PCD)
403 return "unknown";
404
405 return to_name[type];
406}
407
6839a6d9 408int nfit_spa_type(struct acpi_nfit_system_address *spa)
b94d5230
DW		 409{
410 int i;
411
412 for (i = 0; i < NFIT_UUID_MAX; i++)
41c8bdb3 413 if (guid_equal(to_nfit_uuid(i), (guid_t *)&spa->range_guid))
b94d5230
DW		 414 return i;
415 return -1;
416}
417
418static bool add_spa(struct acpi_nfit_desc *acpi_desc,
20985164 419 struct nfit_table_prev *prev,
b94d5230
DW		 420 struct acpi_nfit_system_address *spa)
421{
422 struct device *dev = acpi_desc->dev;
20985164
VV		 423 struct nfit_spa *nfit_spa;
424
31932041
DW		 425 if (spa->header.length != sizeof(*spa))
426 return false;
427
20985164 428 list_for_each_entry(nfit_spa, &prev->spas, list) {
31932041 429 if (memcmp(nfit_spa->spa, spa, sizeof(*spa)) == 0) {
20985164
VV		 430 list_move_tail(&nfit_spa->list, &acpi_desc->spas);
431 return true;
432 }
433 }
b94d5230 434
31932041
DW		 435 nfit_spa = devm_kzalloc(dev, sizeof(*nfit_spa) + sizeof(*spa),
436 GFP_KERNEL);
b94d5230
DW		 437 if (!nfit_spa)
438 return false;
439 INIT_LIST_HEAD(&nfit_spa->list);
31932041 440 memcpy(nfit_spa->spa, spa, sizeof(*spa));
b94d5230
DW		 441 list_add_tail(&nfit_spa->list, &acpi_desc->spas);
442 dev_dbg(dev, "%s: spa index: %d type: %s\n", __func__,
443 spa->range_index,
444 spa_type_name(nfit_spa_type(spa)));
445 return true;
446}
447
448static bool add_memdev(struct acpi_nfit_desc *acpi_desc,
20985164 449 struct nfit_table_prev *prev,
b94d5230
DW		 450 struct acpi_nfit_memory_map *memdev)
451{
452 struct device *dev = acpi_desc->dev;
20985164 453 struct nfit_memdev *nfit_memdev;
b94d5230 454
31932041
DW		 455 if (memdev->header.length != sizeof(*memdev))
456 return false;
457
20985164 458 list_for_each_entry(nfit_memdev, &prev->memdevs, list)
31932041 459 if (memcmp(nfit_memdev->memdev, memdev, sizeof(*memdev)) == 0) {
20985164
VV		 460 list_move_tail(&nfit_memdev->list, &acpi_desc->memdevs);
461 return true;
462 }
463
31932041
DW		 464 nfit_memdev = devm_kzalloc(dev, sizeof(*nfit_memdev) + sizeof(*memdev),
465 GFP_KERNEL);
b94d5230
DW		 466 if (!nfit_memdev)
467 return false;
468 INIT_LIST_HEAD(&nfit_memdev->list);
31932041 469 memcpy(nfit_memdev->memdev, memdev, sizeof(*memdev));
b94d5230 470 list_add_tail(&nfit_memdev->list, &acpi_desc->memdevs);
caa603aa 471 dev_dbg(dev, "%s: memdev handle: %#x spa: %d dcr: %d flags: %#x\n",
b94d5230 472 __func__, memdev->device_handle, memdev->range_index,
caa603aa 473 memdev->region_index, memdev->flags);
b94d5230
DW		 474 return true;
475}
476
31932041
DW		 477/*
478 * An implementation may provide a truncated control region if no block windows
479 * are defined.
480 */
481static size_t sizeof_dcr(struct acpi_nfit_control_region *dcr)
482{
483 if (dcr->header.length < offsetof(struct acpi_nfit_control_region,
484 window_size))
485 return 0;
486 if (dcr->windows)
487 return sizeof(*dcr);
488 return offsetof(struct acpi_nfit_control_region, window_size);
489}
490
b94d5230 491static bool add_dcr(struct acpi_nfit_desc *acpi_desc,
20985164 492 struct nfit_table_prev *prev,
b94d5230
DW		 493 struct acpi_nfit_control_region *dcr)
494{
495 struct device *dev = acpi_desc->dev;
20985164
VV		 496 struct nfit_dcr *nfit_dcr;
497
31932041
DW		 498 if (!sizeof_dcr(dcr))
499 return false;
500
20985164 501 list_for_each_entry(nfit_dcr, &prev->dcrs, list)
31932041 502 if (memcmp(nfit_dcr->dcr, dcr, sizeof_dcr(dcr)) == 0) {
20985164
VV		 503 list_move_tail(&nfit_dcr->list, &acpi_desc->dcrs);
504 return true;
505 }
b94d5230 506
31932041
DW		 507 nfit_dcr = devm_kzalloc(dev, sizeof(*nfit_dcr) + sizeof(*dcr),
508 GFP_KERNEL);
b94d5230
DW		 509 if (!nfit_dcr)
510 return false;
511 INIT_LIST_HEAD(&nfit_dcr->list);
31932041 512 memcpy(nfit_dcr->dcr, dcr, sizeof_dcr(dcr));
b94d5230
DW		 513 list_add_tail(&nfit_dcr->list, &acpi_desc->dcrs);
514 dev_dbg(dev, "%s: dcr index: %d windows: %d\n", __func__,
515 dcr->region_index, dcr->windows);
516 return true;
517}
518
519static bool add_bdw(struct acpi_nfit_desc *acpi_desc,
20985164 520 struct nfit_table_prev *prev,
b94d5230
DW		 521 struct acpi_nfit_data_region *bdw)
522{
523 struct device *dev = acpi_desc->dev;
20985164
VV		 524 struct nfit_bdw *nfit_bdw;
525
31932041
DW		 526 if (bdw->header.length != sizeof(*bdw))
527 return false;
20985164 528 list_for_each_entry(nfit_bdw, &prev->bdws, list)
31932041 529 if (memcmp(nfit_bdw->bdw, bdw, sizeof(*bdw)) == 0) {
20985164
VV		 530 list_move_tail(&nfit_bdw->list, &acpi_desc->bdws);
531 return true;
532 }
b94d5230 533
31932041
DW		 534 nfit_bdw = devm_kzalloc(dev, sizeof(*nfit_bdw) + sizeof(*bdw),
535 GFP_KERNEL);
b94d5230
DW		 536 if (!nfit_bdw)
537 return false;
538 INIT_LIST_HEAD(&nfit_bdw->list);
31932041 539 memcpy(nfit_bdw->bdw, bdw, sizeof(*bdw));
b94d5230
DW		 540 list_add_tail(&nfit_bdw->list, &acpi_desc->bdws);
541 dev_dbg(dev, "%s: bdw dcr: %d windows: %d\n", __func__,
542 bdw->region_index, bdw->windows);
543 return true;
544}
545
31932041
DW		 546static size_t sizeof_idt(struct acpi_nfit_interleave *idt)
547{
548 if (idt->header.length < sizeof(*idt))
549 return 0;
550 return sizeof(*idt) + sizeof(u32) * (idt->line_count - 1);
551}
552
047fc8a1 553static bool add_idt(struct acpi_nfit_desc *acpi_desc,
20985164 554 struct nfit_table_prev *prev,
047fc8a1
RZ		 555 struct acpi_nfit_interleave *idt)
556{
557 struct device *dev = acpi_desc->dev;
20985164
VV		 558 struct nfit_idt *nfit_idt;
559
31932041
DW		 560 if (!sizeof_idt(idt))
561 return false;
562
563 list_for_each_entry(nfit_idt, &prev->idts, list) {
564 if (sizeof_idt(nfit_idt->idt) != sizeof_idt(idt))
565 continue;
566
567 if (memcmp(nfit_idt->idt, idt, sizeof_idt(idt)) == 0) {
20985164
VV		 568 list_move_tail(&nfit_idt->list, &acpi_desc->idts);
569 return true;
570 }
31932041 571 }
047fc8a1 572
31932041
DW		 573 nfit_idt = devm_kzalloc(dev, sizeof(*nfit_idt) + sizeof_idt(idt),
574 GFP_KERNEL);
047fc8a1
RZ		 575 if (!nfit_idt)
576 return false;
577 INIT_LIST_HEAD(&nfit_idt->list);
31932041 578 memcpy(nfit_idt->idt, idt, sizeof_idt(idt));
047fc8a1
RZ		 579 list_add_tail(&nfit_idt->list, &acpi_desc->idts);
580 dev_dbg(dev, "%s: idt index: %d num_lines: %d\n", __func__,
581 idt->interleave_index, idt->line_count);
582 return true;
583}
584
31932041
DW		 585static size_t sizeof_flush(struct acpi_nfit_flush_address *flush)
586{
587 if (flush->header.length < sizeof(*flush))
588 return 0;
589 return sizeof(*flush) + sizeof(u64) * (flush->hint_count - 1);
590}
591
c2ad2954 592static bool add_flush(struct acpi_nfit_desc *acpi_desc,
20985164 593 struct nfit_table_prev *prev,
c2ad2954
RZ		 594 struct acpi_nfit_flush_address *flush)
595{
596 struct device *dev = acpi_desc->dev;
20985164 597 struct nfit_flush *nfit_flush;
c2ad2954 598
31932041
DW		 599 if (!sizeof_flush(flush))
600 return false;
601
602 list_for_each_entry(nfit_flush, &prev->flushes, list) {
603 if (sizeof_flush(nfit_flush->flush) != sizeof_flush(flush))
604 continue;
605
606 if (memcmp(nfit_flush->flush, flush,
607 sizeof_flush(flush)) == 0) {
20985164
VV		 608 list_move_tail(&nfit_flush->list, &acpi_desc->flushes);
609 return true;
610 }
31932041 611 }
20985164 612
31932041
DW		 613 nfit_flush = devm_kzalloc(dev, sizeof(*nfit_flush)
614 + sizeof_flush(flush), GFP_KERNEL);
c2ad2954
RZ		 615 if (!nfit_flush)
616 return false;
617 INIT_LIST_HEAD(&nfit_flush->list);
31932041 618 memcpy(nfit_flush->flush, flush, sizeof_flush(flush));
c2ad2954
RZ		 619 list_add_tail(&nfit_flush->list, &acpi_desc->flushes);
620 dev_dbg(dev, "%s: nfit_flush handle: %d hint_count: %d\n", __func__,
621 flush->device_handle, flush->hint_count);
622 return true;
623}
624
20985164
VV		 625static void *add_table(struct acpi_nfit_desc *acpi_desc,
626 struct nfit_table_prev *prev, void *table, const void *end)
b94d5230
DW		 627{
628 struct device *dev = acpi_desc->dev;
629 struct acpi_nfit_header *hdr;
630 void *err = ERR_PTR(-ENOMEM);
631
632 if (table >= end)
633 return NULL;
634
635 hdr = table;
564d5011
VV		 636 if (!hdr->length) {
637 dev_warn(dev, "found a zero length table '%d' parsing nfit\n",
638 hdr->type);
639 return NULL;
640 }
641
b94d5230
DW		 642 switch (hdr->type) {
643 case ACPI_NFIT_TYPE_SYSTEM_ADDRESS:
20985164 644 if (!add_spa(acpi_desc, prev, table))
b94d5230
DW		 645 return err;
646 break;
647 case ACPI_NFIT_TYPE_MEMORY_MAP:
20985164 648 if (!add_memdev(acpi_desc, prev, table))
b94d5230
DW		 649 return err;
650 break;
651 case ACPI_NFIT_TYPE_CONTROL_REGION:
20985164 652 if (!add_dcr(acpi_desc, prev, table))
b94d5230
DW		 653 return err;
654 break;
655 case ACPI_NFIT_TYPE_DATA_REGION:
20985164 656 if (!add_bdw(acpi_desc, prev, table))
b94d5230
DW		 657 return err;
658 break;
b94d5230 659 case ACPI_NFIT_TYPE_INTERLEAVE:
20985164 660 if (!add_idt(acpi_desc, prev, table))
047fc8a1 661 return err;
b94d5230
DW		 662 break;
663 case ACPI_NFIT_TYPE_FLUSH_ADDRESS:
20985164 664 if (!add_flush(acpi_desc, prev, table))
c2ad2954 665 return err;
b94d5230
DW		 666 break;
667 case ACPI_NFIT_TYPE_SMBIOS:
668 dev_dbg(dev, "%s: smbios\n", __func__);
669 break;
670 default:
671 dev_err(dev, "unknown table '%d' parsing nfit\n", hdr->type);
672 break;
673 }
674
675 return table + hdr->length;
676}
677
678static void nfit_mem_find_spa_bdw(struct acpi_nfit_desc *acpi_desc,
679 struct nfit_mem *nfit_mem)
680{
681 u32 device_handle = __to_nfit_memdev(nfit_mem)->device_handle;
682 u16 dcr = nfit_mem->dcr->region_index;
683 struct nfit_spa *nfit_spa;
684
685 list_for_each_entry(nfit_spa, &acpi_desc->spas, list) {
686 u16 range_index = nfit_spa->spa->range_index;
687 int type = nfit_spa_type(nfit_spa->spa);
688 struct nfit_memdev *nfit_memdev;
689
690 if (type != NFIT_SPA_BDW)
691 continue;
692
693 list_for_each_entry(nfit_memdev, &acpi_desc->memdevs, list) {
694 if (nfit_memdev->memdev->range_index != range_index)
695 continue;
696 if (nfit_memdev->memdev->device_handle != device_handle)
697 continue;
698 if (nfit_memdev->memdev->region_index != dcr)
699 continue;
700
701 nfit_mem->spa_bdw = nfit_spa->spa;
702 return;
703 }
704 }
705
706 dev_dbg(acpi_desc->dev, "SPA-BDW not found for SPA-DCR %d\n",
707 nfit_mem->spa_dcr->range_index);
708 nfit_mem->bdw = NULL;
709}
710
6697b2cf 711static void nfit_mem_init_bdw(struct acpi_nfit_desc *acpi_desc,
b94d5230
DW		 712 struct nfit_mem *nfit_mem, struct acpi_nfit_system_address *spa)
713{
714 u16 dcr = __to_nfit_memdev(nfit_mem)->region_index;
047fc8a1 715 struct nfit_memdev *nfit_memdev;
b94d5230 716 struct nfit_bdw *nfit_bdw;
047fc8a1
RZ		 717 struct nfit_idt *nfit_idt;
718 u16 idt_idx, range_index;
b94d5230 719
b94d5230
DW		 720 list_for_each_entry(nfit_bdw, &acpi_desc->bdws, list) {
721 if (nfit_bdw->bdw->region_index != dcr)
722 continue;
723 nfit_mem->bdw = nfit_bdw->bdw;
724 break;
725 }
726
727 if (!nfit_mem->bdw)
6697b2cf 728 return;
b94d5230
DW		 729
730 nfit_mem_find_spa_bdw(acpi_desc, nfit_mem);
047fc8a1
RZ		 731
732 if (!nfit_mem->spa_bdw)
6697b2cf 733 return;
047fc8a1
RZ		 734
735 range_index = nfit_mem->spa_bdw->range_index;
736 list_for_each_entry(nfit_memdev, &acpi_desc->memdevs, list) {
737 if (nfit_memdev->memdev->range_index != range_index ||
738 nfit_memdev->memdev->region_index != dcr)
739 continue;
740 nfit_mem->memdev_bdw = nfit_memdev->memdev;
741 idt_idx = nfit_memdev->memdev->interleave_index;
742 list_for_each_entry(nfit_idt, &acpi_desc->idts, list) {
743 if (nfit_idt->idt->interleave_index != idt_idx)
744 continue;
745 nfit_mem->idt_bdw = nfit_idt->idt;
746 break;
747 }
748 break;
749 }
b94d5230
DW		 750}
751
1499934d 752static int __nfit_mem_init(struct acpi_nfit_desc *acpi_desc,
b94d5230
DW		 753 struct acpi_nfit_system_address *spa)
754{
755 struct nfit_mem *nfit_mem, *found;
756 struct nfit_memdev *nfit_memdev;
1499934d 757 int type = spa ? nfit_spa_type(spa) : 0;
b94d5230
DW		 758
759 switch (type) {
760 case NFIT_SPA_DCR:
761 case NFIT_SPA_PM:
762 break;
763 default:
1499934d
DW		 764 if (spa)
765 return 0;
b94d5230
DW		 766 }
767
1499934d
DW		 768 /*
769 * This loop runs in two modes, when a dimm is mapped the loop
770 * adds memdev associations to an existing dimm, or creates a
771 * dimm. In the unmapped dimm case this loop sweeps for memdev
772 * instances with an invalid / zero range_index and adds those
773 * dimms without spa associations.
774 */
b94d5230 775 list_for_each_entry(nfit_memdev, &acpi_desc->memdevs, list) {
ad9ac5e1 776 struct nfit_flush *nfit_flush;
6697b2cf
DW		 777 struct nfit_dcr *nfit_dcr;
778 u32 device_handle;
779 u16 dcr;
b94d5230 780
1499934d
DW		 781 if (spa && nfit_memdev->memdev->range_index != spa->range_index)
782 continue;
783 if (!spa && nfit_memdev->memdev->range_index)
b94d5230
DW		 784 continue;
785 found = NULL;
786 dcr = nfit_memdev->memdev->region_index;
6697b2cf 787 device_handle = nfit_memdev->memdev->device_handle;
b94d5230 788 list_for_each_entry(nfit_mem, &acpi_desc->dimms, list)
6697b2cf
DW		 789 if (__to_nfit_memdev(nfit_mem)->device_handle
790 == device_handle) {
b94d5230
DW		 791 found = nfit_mem;
792 break;
793 }
794
795 if (found)
796 nfit_mem = found;
797 else {
798 nfit_mem = devm_kzalloc(acpi_desc->dev,
799 sizeof(*nfit_mem), GFP_KERNEL);
800 if (!nfit_mem)
801 return -ENOMEM;
802 INIT_LIST_HEAD(&nfit_mem->list);
8cc6ddfc 803 nfit_mem->acpi_desc = acpi_desc;
6697b2cf
DW		 804 list_add(&nfit_mem->list, &acpi_desc->dimms);
805 }
806
807 list_for_each_entry(nfit_dcr, &acpi_desc->dcrs, list) {
808 if (nfit_dcr->dcr->region_index != dcr)
809 continue;
810 /*
811 * Record the control region for the dimm. For
812 * the ACPI 6.1 case, where there are separate
813 * control regions for the pmem vs blk
814 * interfaces, be sure to record the extended
815 * blk details.
816 */
817 if (!nfit_mem->dcr)
818 nfit_mem->dcr = nfit_dcr->dcr;
819 else if (nfit_mem->dcr->windows == 0
820 && nfit_dcr->dcr->windows)
821 nfit_mem->dcr = nfit_dcr->dcr;
822 break;
823 }
824
ad9ac5e1 825 list_for_each_entry(nfit_flush, &acpi_desc->flushes, list) {
e5ae3b25
DW		 826 struct acpi_nfit_flush_address *flush;
827 u16 i;
828
ad9ac5e1
DW		 829 if (nfit_flush->flush->device_handle != device_handle)
830 continue;
831 nfit_mem->nfit_flush = nfit_flush;
e5ae3b25
DW		 832 flush = nfit_flush->flush;
833 nfit_mem->flush_wpq = devm_kzalloc(acpi_desc->dev,
834 flush->hint_count
835 * sizeof(struct resource), GFP_KERNEL);
836 if (!nfit_mem->flush_wpq)
837 return -ENOMEM;
838 for (i = 0; i < flush->hint_count; i++) {
839 struct resource *res = &nfit_mem->flush_wpq[i];
840
841 res->start = flush->hint_address[i];
842 res->end = res->start + 8 - 1;
843 }
ad9ac5e1
DW		 844 break;
845 }
846
6697b2cf
DW		 847 if (dcr && !nfit_mem->dcr) {
848 dev_err(acpi_desc->dev, "SPA %d missing DCR %d\n",
849 spa->range_index, dcr);
850 return -ENODEV;
b94d5230
DW		 851 }
852
853 if (type == NFIT_SPA_DCR) {
047fc8a1
RZ		 854 struct nfit_idt *nfit_idt;
855 u16 idt_idx;
856
b94d5230
DW		 857 /* multiple dimms may share a SPA when interleaved */
858 nfit_mem->spa_dcr = spa;
859 nfit_mem->memdev_dcr = nfit_memdev->memdev;
047fc8a1
RZ		 860 idt_idx = nfit_memdev->memdev->interleave_index;
861 list_for_each_entry(nfit_idt, &acpi_desc->idts, list) {
862 if (nfit_idt->idt->interleave_index != idt_idx)
863 continue;
864 nfit_mem->idt_dcr = nfit_idt->idt;
865 break;
866 }
6697b2cf 867 nfit_mem_init_bdw(acpi_desc, nfit_mem, spa);
1499934d 868 } else if (type == NFIT_SPA_PM) {
b94d5230
DW		 869 /*
870 * A single dimm may belong to multiple SPA-PM
871 * ranges, record at least one in addition to
872 * any SPA-DCR range.
873 */
874 nfit_mem->memdev_pmem = nfit_memdev->memdev;
1499934d
DW		 875 } else
876 nfit_mem->memdev_dcr = nfit_memdev->memdev;
b94d5230
DW		 877 }
878
879 return 0;
880}
881
882static int nfit_mem_cmp(void *priv, struct list_head *_a, struct list_head *_b)
883{
884 struct nfit_mem *a = container_of(_a, typeof(*a), list);
885 struct nfit_mem *b = container_of(_b, typeof(*b), list);
886 u32 handleA, handleB;
887
888 handleA = __to_nfit_memdev(a)->device_handle;
889 handleB = __to_nfit_memdev(b)->device_handle;
890 if (handleA < handleB)
891 return -1;
892 else if (handleA > handleB)
893 return 1;
894 return 0;
895}
896
897static int nfit_mem_init(struct acpi_nfit_desc *acpi_desc)
898{
899 struct nfit_spa *nfit_spa;
1499934d
DW		 900 int rc;
901
b94d5230
DW		 902
903 /*
904 * For each SPA-DCR or SPA-PMEM address range find its
905 * corresponding MEMDEV(s). From each MEMDEV find the
906 * corresponding DCR. Then, if we're operating on a SPA-DCR,
907 * try to find a SPA-BDW and a corresponding BDW that references
908 * the DCR. Throw it all into an nfit_mem object. Note, that
909 * BDWs are optional.
910 */
911 list_for_each_entry(nfit_spa, &acpi_desc->spas, list) {
1499934d 912 rc = __nfit_mem_init(acpi_desc, nfit_spa->spa);
b94d5230
DW		 913 if (rc)
914 return rc;
915 }
916
1499934d
DW		 917 /*
918 * If a DIMM has failed to be mapped into SPA there will be no
919 * SPA entries above. Find and register all the unmapped DIMMs
920 * for reporting and recovery purposes.
921 */
922 rc = __nfit_mem_init(acpi_desc, NULL);
923 if (rc)
924 return rc;
925
b94d5230
DW		 926 list_sort(NULL, &acpi_desc->dimms, nfit_mem_cmp);
927
928 return 0;
929}
930
41f95db7
JH		 931static ssize_t bus_dsm_mask_show(struct device *dev,
932 struct device_attribute *attr, char *buf)
933{
934 struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev);
935 struct nvdimm_bus_descriptor *nd_desc = to_nd_desc(nvdimm_bus);
936
937 return sprintf(buf, "%#lx\n", nd_desc->bus_dsm_mask);
938}
939static struct device_attribute dev_attr_bus_dsm_mask =
940 __ATTR(dsm_mask, 0444, bus_dsm_mask_show, NULL);
941
45def22c
DW		 942static ssize_t revision_show(struct device *dev,
943 struct device_attribute *attr, char *buf)
944{
945 struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev);
946 struct nvdimm_bus_descriptor *nd_desc = to_nd_desc(nvdimm_bus);
947 struct acpi_nfit_desc *acpi_desc = to_acpi_desc(nd_desc);
948
6b577c9d 949 return sprintf(buf, "%d\n", acpi_desc->acpi_header.revision);
45def22c
DW		 950}
951static DEVICE_ATTR_RO(revision);
952
9ffd6350
VV		 953static ssize_t hw_error_scrub_show(struct device *dev,
954 struct device_attribute *attr, char *buf)
955{
956 struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev);
957 struct nvdimm_bus_descriptor *nd_desc = to_nd_desc(nvdimm_bus);
958 struct acpi_nfit_desc *acpi_desc = to_acpi_desc(nd_desc);
959
960 return sprintf(buf, "%d\n", acpi_desc->scrub_mode);
961}
962
963/*
964 * The 'hw_error_scrub' attribute can have the following values written to it:
965 * '0': Switch to the default mode where an exception will only insert
966 * the address of the memory error into the poison and badblocks lists.
967 * '1': Enable a full scrub to happen if an exception for a memory error is
968 * received.
969 */
970static ssize_t hw_error_scrub_store(struct device *dev,
971 struct device_attribute *attr, const char *buf, size_t size)
972{
973 struct nvdimm_bus_descriptor *nd_desc;
974 ssize_t rc;
975 long val;
976
977 rc = kstrtol(buf, 0, &val);
978 if (rc)
979 return rc;
980
981 device_lock(dev);
982 nd_desc = dev_get_drvdata(dev);
983 if (nd_desc) {
984 struct acpi_nfit_desc *acpi_desc = to_acpi_desc(nd_desc);
985
986 switch (val) {
987 case HW_ERROR_SCRUB_ON:
988 acpi_desc->scrub_mode = HW_ERROR_SCRUB_ON;
989 break;
990 case HW_ERROR_SCRUB_OFF:
991 acpi_desc->scrub_mode = HW_ERROR_SCRUB_OFF;
992 break;
993 default:
994 rc = -EINVAL;
995 break;
996 }
997 }
998 device_unlock(dev);
999 if (rc)
1000 return rc;
1001 return size;
1002}
1003static DEVICE_ATTR_RW(hw_error_scrub);
1004
37b137ff
VV		 1005/*
1006 * This shows the number of full Address Range Scrubs that have been
1007 * completed since driver load time. Userspace can wait on this using
1008 * select/poll etc. A '+' at the end indicates an ARS is in progress
1009 */
1010static ssize_t scrub_show(struct device *dev,
1011 struct device_attribute *attr, char *buf)
1012{
1013 struct nvdimm_bus_descriptor *nd_desc;
1014 ssize_t rc = -ENXIO;
1015
1016 device_lock(dev);
1017 nd_desc = dev_get_drvdata(dev);
1018 if (nd_desc) {
1019 struct acpi_nfit_desc *acpi_desc = to_acpi_desc(nd_desc);
1020
1021 rc = sprintf(buf, "%d%s", acpi_desc->scrub_count,
1022 (work_busy(&acpi_desc->work)) ? "+\n" : "\n");
1023 }
1024 device_unlock(dev);
1025 return rc;
1026}
1027
37b137ff
VV		 1028static ssize_t scrub_store(struct device *dev,
1029 struct device_attribute *attr, const char *buf, size_t size)
1030{
1031 struct nvdimm_bus_descriptor *nd_desc;
1032 ssize_t rc;
1033 long val;
1034
1035 rc = kstrtol(buf, 0, &val);
1036 if (rc)
1037 return rc;
1038 if (val != 1)
1039 return -EINVAL;
1040
1041 device_lock(dev);
1042 nd_desc = dev_get_drvdata(dev);
1043 if (nd_desc) {
1044 struct acpi_nfit_desc *acpi_desc = to_acpi_desc(nd_desc);
1045
80790039 1046 rc = acpi_nfit_ars_rescan(acpi_desc, 0);
37b137ff
VV		 1047 }
1048 device_unlock(dev);
1049 if (rc)
1050 return rc;
1051 return size;
1052}
1053static DEVICE_ATTR_RW(scrub);
1054
1055static bool ars_supported(struct nvdimm_bus *nvdimm_bus)
1056{
1057 struct nvdimm_bus_descriptor *nd_desc = to_nd_desc(nvdimm_bus);
1058 const unsigned long mask = 1 << ND_CMD_ARS_CAP | 1 << ND_CMD_ARS_START
1059 | 1 << ND_CMD_ARS_STATUS;
1060
1061 return (nd_desc->cmd_mask & mask) == mask;
1062}
1063
1064static umode_t nfit_visible(struct kobject *kobj, struct attribute *a, int n)
1065{
1066 struct device *dev = container_of(kobj, struct device, kobj);
1067 struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev);
1068
1069 if (a == &dev_attr_scrub.attr && !ars_supported(nvdimm_bus))
1070 return 0;
1071 return a->mode;
1072}
1073
45def22c
DW		 1074static struct attribute *acpi_nfit_attributes[] = {
1075 &dev_attr_revision.attr,
37b137ff 1076 &dev_attr_scrub.attr,
9ffd6350 1077 &dev_attr_hw_error_scrub.attr,
41f95db7 1078 &dev_attr_bus_dsm_mask.attr,
45def22c
DW		 1079 NULL,
1080};
1081
5e93746f 1082static const struct attribute_group acpi_nfit_attribute_group = {
45def22c
DW		 1083 .name = "nfit",
1084 .attrs = acpi_nfit_attributes,
37b137ff 1085 .is_visible = nfit_visible,
45def22c
DW		 1086};
1087
a61fe6f7 1088static const struct attribute_group *acpi_nfit_attribute_groups[] = {
45def22c
DW		 1089 &nvdimm_bus_attribute_group,
1090 &acpi_nfit_attribute_group,
1091 NULL,
1092};
1093
e6dfb2de
DW		 1094static struct acpi_nfit_memory_map *to_nfit_memdev(struct device *dev)
1095{
1096 struct nvdimm *nvdimm = to_nvdimm(dev);
1097 struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
1098
1099 return __to_nfit_memdev(nfit_mem);
1100}
1101
1102static struct acpi_nfit_control_region *to_nfit_dcr(struct device *dev)
1103{
1104 struct nvdimm *nvdimm = to_nvdimm(dev);
1105 struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
1106
1107 return nfit_mem->dcr;
1108}
1109
1110static ssize_t handle_show(struct device *dev,
1111 struct device_attribute *attr, char *buf)
1112{
1113 struct acpi_nfit_memory_map *memdev = to_nfit_memdev(dev);
1114
1115 return sprintf(buf, "%#x\n", memdev->device_handle);
1116}
1117static DEVICE_ATTR_RO(handle);
1118
1119static ssize_t phys_id_show(struct device *dev,
1120 struct device_attribute *attr, char *buf)
1121{
1122 struct acpi_nfit_memory_map *memdev = to_nfit_memdev(dev);
1123
1124 return sprintf(buf, "%#x\n", memdev->physical_id);
1125}
1126static DEVICE_ATTR_RO(phys_id);
1127
1128static ssize_t vendor_show(struct device *dev,
1129 struct device_attribute *attr, char *buf)
1130{
1131 struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev);
1132
5ad9a7fd 1133 return sprintf(buf, "0x%04x\n", be16_to_cpu(dcr->vendor_id));
e6dfb2de
DW		 1134}
1135static DEVICE_ATTR_RO(vendor);
1136
1137static ssize_t rev_id_show(struct device *dev,
1138 struct device_attribute *attr, char *buf)
1139{
1140 struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev);
1141
5ad9a7fd 1142 return sprintf(buf, "0x%04x\n", be16_to_cpu(dcr->revision_id));
e6dfb2de
DW		 1143}
1144static DEVICE_ATTR_RO(rev_id);
1145
1146static ssize_t device_show(struct device *dev,
1147 struct device_attribute *attr, char *buf)
1148{
1149 struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev);
1150
5ad9a7fd 1151 return sprintf(buf, "0x%04x\n", be16_to_cpu(dcr->device_id));
e6dfb2de
DW		 1152}
1153static DEVICE_ATTR_RO(device);
1154
6ca72085
DW		 1155static ssize_t subsystem_vendor_show(struct device *dev,
1156 struct device_attribute *attr, char *buf)
1157{
1158 struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev);
1159
1160 return sprintf(buf, "0x%04x\n", be16_to_cpu(dcr->subsystem_vendor_id));
1161}
1162static DEVICE_ATTR_RO(subsystem_vendor);
1163
1164static ssize_t subsystem_rev_id_show(struct device *dev,
1165 struct device_attribute *attr, char *buf)
1166{
1167 struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev);
1168
1169 return sprintf(buf, "0x%04x\n",
1170 be16_to_cpu(dcr->subsystem_revision_id));
1171}
1172static DEVICE_ATTR_RO(subsystem_rev_id);
1173
1174static ssize_t subsystem_device_show(struct device *dev,
1175 struct device_attribute *attr, char *buf)
1176{
1177 struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev);
1178
1179 return sprintf(buf, "0x%04x\n", be16_to_cpu(dcr->subsystem_device_id));
1180}
1181static DEVICE_ATTR_RO(subsystem_device);
1182
8cc6ddfc
DW		 1183static int num_nvdimm_formats(struct nvdimm *nvdimm)
1184{
1185 struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
1186 int formats = 0;
1187
1188 if (nfit_mem->memdev_pmem)
1189 formats++;
1190 if (nfit_mem->memdev_bdw)
1191 formats++;
1192 return formats;
1193}
1194
e6dfb2de
DW		 1195static ssize_t format_show(struct device *dev,
1196 struct device_attribute *attr, char *buf)
1197{
1198 struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev);
1199
1bcbf42d 1200 return sprintf(buf, "0x%04x\n", le16_to_cpu(dcr->code));
e6dfb2de
DW		 1201}
1202static DEVICE_ATTR_RO(format);
1203
8cc6ddfc
DW		 1204static ssize_t format1_show(struct device *dev,
1205 struct device_attribute *attr, char *buf)
1206{
1207 u32 handle;
1208 ssize_t rc = -ENXIO;
1209 struct nfit_mem *nfit_mem;
1210 struct nfit_memdev *nfit_memdev;
1211 struct acpi_nfit_desc *acpi_desc;
1212 struct nvdimm *nvdimm = to_nvdimm(dev);
1213 struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev);
1214
1215 nfit_mem = nvdimm_provider_data(nvdimm);
1216 acpi_desc = nfit_mem->acpi_desc;
1217 handle = to_nfit_memdev(dev)->device_handle;
1218
1219 /* assumes DIMMs have at most 2 published interface codes */
1220 mutex_lock(&acpi_desc->init_mutex);
1221 list_for_each_entry(nfit_memdev, &acpi_desc->memdevs, list) {
1222 struct acpi_nfit_memory_map *memdev = nfit_memdev->memdev;
1223 struct nfit_dcr *nfit_dcr;
1224
1225 if (memdev->device_handle != handle)
1226 continue;
1227
1228 list_for_each_entry(nfit_dcr, &acpi_desc->dcrs, list) {
1229 if (nfit_dcr->dcr->region_index != memdev->region_index)
1230 continue;
1231 if (nfit_dcr->dcr->code == dcr->code)
1232 continue;
1bcbf42d
DW		 1233 rc = sprintf(buf, "0x%04x\n",
1234 le16_to_cpu(nfit_dcr->dcr->code));
8cc6ddfc
DW		 1235 break;
1236 }
1237 if (rc != ENXIO)
1238 break;
1239 }
1240 mutex_unlock(&acpi_desc->init_mutex);
1241 return rc;
1242}
1243static DEVICE_ATTR_RO(format1);
1244
1245static ssize_t formats_show(struct device *dev,
1246 struct device_attribute *attr, char *buf)
1247{
1248 struct nvdimm *nvdimm = to_nvdimm(dev);
1249
1250 return sprintf(buf, "%d\n", num_nvdimm_formats(nvdimm));
1251}
1252static DEVICE_ATTR_RO(formats);
1253
e6dfb2de
DW		 1254static ssize_t serial_show(struct device *dev,
1255 struct device_attribute *attr, char *buf)
1256{
1257 struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev);
1258
5ad9a7fd 1259 return sprintf(buf, "0x%08x\n", be32_to_cpu(dcr->serial_number));
e6dfb2de
DW		 1260}
1261static DEVICE_ATTR_RO(serial);
1262
a94e3fbe
DW		 1263static ssize_t family_show(struct device *dev,
1264 struct device_attribute *attr, char *buf)
1265{
1266 struct nvdimm *nvdimm = to_nvdimm(dev);
1267 struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
1268
1269 if (nfit_mem->family < 0)
1270 return -ENXIO;
1271 return sprintf(buf, "%d\n", nfit_mem->family);
1272}
1273static DEVICE_ATTR_RO(family);
1274
1275static ssize_t dsm_mask_show(struct device *dev,
1276 struct device_attribute *attr, char *buf)
1277{
1278 struct nvdimm *nvdimm = to_nvdimm(dev);
1279 struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
1280
1281 if (nfit_mem->family < 0)
1282 return -ENXIO;
1283 return sprintf(buf, "%#lx\n", nfit_mem->dsm_mask);
1284}
1285static DEVICE_ATTR_RO(dsm_mask);
1286
58138820
DW		 1287static ssize_t flags_show(struct device *dev,
1288 struct device_attribute *attr, char *buf)
1289{
1290 u16 flags = to_nfit_memdev(dev)->flags;
1291
ffab9385 1292 return sprintf(buf, "%s%s%s%s%s%s%s\n",
402bae59
TK		 1293 flags & ACPI_NFIT_MEM_SAVE_FAILED ? "save_fail " : "",
1294 flags & ACPI_NFIT_MEM_RESTORE_FAILED ? "restore_fail " : "",
1295 flags & ACPI_NFIT_MEM_FLUSH_FAILED ? "flush_fail " : "",
ca321d1c 1296 flags & ACPI_NFIT_MEM_NOT_ARMED ? "not_armed " : "",
ffab9385
DW		 1297 flags & ACPI_NFIT_MEM_HEALTH_OBSERVED ? "smart_event " : "",
1298 flags & ACPI_NFIT_MEM_MAP_FAILED ? "map_fail " : "",
1299 flags & ACPI_NFIT_MEM_HEALTH_ENABLED ? "smart_notify " : "");
58138820
DW		 1300}
1301static DEVICE_ATTR_RO(flags);
1302
38a879ba
TK		 1303static ssize_t id_show(struct device *dev,
1304 struct device_attribute *attr, char *buf)
1305{
1306 struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev);
1307
1308 if (dcr->valid_fields & ACPI_NFIT_CONTROL_MFG_INFO_VALID)
1309 return sprintf(buf, "%04x-%02x-%04x-%08x\n",
1310 be16_to_cpu(dcr->vendor_id),
1311 dcr->manufacturing_location,
1312 be16_to_cpu(dcr->manufacturing_date),
1313 be32_to_cpu(dcr->serial_number));
1314 else
1315 return sprintf(buf, "%04x-%08x\n",
1316 be16_to_cpu(dcr->vendor_id),
1317 be32_to_cpu(dcr->serial_number));
1318}
1319static DEVICE_ATTR_RO(id);
1320
e6dfb2de
DW		 1321static struct attribute *acpi_nfit_dimm_attributes[] = {
1322 &dev_attr_handle.attr,
1323 &dev_attr_phys_id.attr,
1324 &dev_attr_vendor.attr,
1325 &dev_attr_device.attr,
6ca72085
DW		 1326 &dev_attr_rev_id.attr,
1327 &dev_attr_subsystem_vendor.attr,
1328 &dev_attr_subsystem_device.attr,
1329 &dev_attr_subsystem_rev_id.attr,
e6dfb2de 1330 &dev_attr_format.attr,
8cc6ddfc
DW		 1331 &dev_attr_formats.attr,
1332 &dev_attr_format1.attr,
e6dfb2de 1333 &dev_attr_serial.attr,
58138820 1334 &dev_attr_flags.attr,
38a879ba 1335 &dev_attr_id.attr,
a94e3fbe
DW		 1336 &dev_attr_family.attr,
1337 &dev_attr_dsm_mask.attr,
e6dfb2de
DW		 1338 NULL,
1339};
1340
1341static umode_t acpi_nfit_dimm_attr_visible(struct kobject *kobj,
1342 struct attribute *a, int n)
1343{
1344 struct device *dev = container_of(kobj, struct device, kobj);
8cc6ddfc 1345 struct nvdimm *nvdimm = to_nvdimm(dev);
e6dfb2de 1346
1499934d
DW		 1347 if (!to_nfit_dcr(dev)) {
1348 /* Without a dcr only the memdev attributes can be surfaced */
1349 if (a == &dev_attr_handle.attr || a == &dev_attr_phys_id.attr
1350 || a == &dev_attr_flags.attr
1351 || a == &dev_attr_family.attr
1352 || a == &dev_attr_dsm_mask.attr)
1353 return a->mode;
8cc6ddfc 1354 return 0;
1499934d
DW		 1355 }
1356
8cc6ddfc 1357 if (a == &dev_attr_format1.attr && num_nvdimm_formats(nvdimm) <= 1)
e6dfb2de 1358 return 0;
8cc6ddfc 1359 return a->mode;
e6dfb2de
DW		 1360}
1361
5e93746f 1362static const struct attribute_group acpi_nfit_dimm_attribute_group = {
e6dfb2de
DW		 1363 .name = "nfit",
1364 .attrs = acpi_nfit_dimm_attributes,
1365 .is_visible = acpi_nfit_dimm_attr_visible,
1366};
1367
1368static const struct attribute_group *acpi_nfit_dimm_attribute_groups[] = {
62232e45 1369 &nvdimm_attribute_group,
4d88a97a 1370 &nd_device_attribute_group,
e6dfb2de
DW		 1371 &acpi_nfit_dimm_attribute_group,
1372 NULL,
1373};
1374
1375static struct nvdimm *acpi_nfit_dimm_by_handle(struct acpi_nfit_desc *acpi_desc,
1376 u32 device_handle)
1377{
1378 struct nfit_mem *nfit_mem;
1379
1380 list_for_each_entry(nfit_mem, &acpi_desc->dimms, list)
1381 if (__to_nfit_memdev(nfit_mem)->device_handle == device_handle)
1382 return nfit_mem->nvdimm;
1383
1384 return NULL;
1385}
1386
231bf117 1387void __acpi_nvdimm_notify(struct device *dev, u32 event)
ba9c8dd3
DW		 1388{
1389 struct nfit_mem *nfit_mem;
1390 struct acpi_nfit_desc *acpi_desc;
1391
1392 dev_dbg(dev->parent, "%s: %s: event: %d\n", dev_name(dev), __func__,
1393 event);
1394
1395 if (event != NFIT_NOTIFY_DIMM_HEALTH) {
1396 dev_dbg(dev->parent, "%s: unknown event: %d\n", dev_name(dev),
1397 event);
1398 return;
1399 }
1400
1401 acpi_desc = dev_get_drvdata(dev->parent);
1402 if (!acpi_desc)
1403 return;
1404
1405 /*
1406 * If we successfully retrieved acpi_desc, then we know nfit_mem data
1407 * is still valid.
1408 */
1409 nfit_mem = dev_get_drvdata(dev);
1410 if (nfit_mem && nfit_mem->flags_attr)
1411 sysfs_notify_dirent(nfit_mem->flags_attr);
1412}
231bf117 1413EXPORT_SYMBOL_GPL(__acpi_nvdimm_notify);
ba9c8dd3
DW		 1414
1415static void acpi_nvdimm_notify(acpi_handle handle, u32 event, void *data)
1416{
1417 struct acpi_device *adev = data;
1418 struct device *dev = &adev->dev;
1419
1420 device_lock(dev->parent);
1421 __acpi_nvdimm_notify(dev, event);
1422 device_unlock(dev->parent);
1423}
1424
62232e45
DW		 1425static int acpi_nfit_add_dimm(struct acpi_nfit_desc *acpi_desc,
1426 struct nfit_mem *nfit_mem, u32 device_handle)
1427{
1428 struct acpi_device *adev, *adev_dimm;
1429 struct device *dev = acpi_desc->dev;
31eca76b 1430 unsigned long dsm_mask;
41c8bdb3 1431 const guid_t *guid;
60e95f43 1432 int i;
ba650cfc 1433 int family = -1;
62232e45 1434
e3654eca
DW		 1435 /* nfit test assumes 1:1 relationship between commands and dsms */
1436 nfit_mem->dsm_mask = acpi_desc->dimm_cmd_force_en;
31eca76b 1437 nfit_mem->family = NVDIMM_FAMILY_INTEL;
62232e45
DW		 1438 adev = to_acpi_dev(acpi_desc);
1439 if (!adev)
1440 return 0;
1441
1442 adev_dimm = acpi_find_child_device(adev, device_handle, false);
1443 nfit_mem->adev = adev_dimm;
1444 if (!adev_dimm) {
1445 dev_err(dev, "no ACPI.NFIT device with _ADR %#x, disabling...\n",
1446 device_handle);
4d88a97a 1447 return force_enable_dimms ? 0 : -ENODEV;
62232e45
DW		 1448 }
1449
ba9c8dd3
DW		 1450 if (ACPI_FAILURE(acpi_install_notify_handler(adev_dimm->handle,
1451 ACPI_DEVICE_NOTIFY, acpi_nvdimm_notify, adev_dimm))) {
1452 dev_err(dev, "%s: notification registration failed\n",
1453 dev_name(&adev_dimm->dev));
1454 return -ENXIO;
1455 }
1456
31eca76b 1457 /*
e02fb726 1458 * Until standardization materializes we need to consider 4
a7225598 1459 * different command sets. Note, that checking for function0 (bit0)
41c8bdb3 1460 * tells us if any commands are reachable through this GUID.
31eca76b 1461 */
e02fb726 1462 for (i = NVDIMM_FAMILY_INTEL; i <= NVDIMM_FAMILY_MSFT; i++)
a7225598 1463 if (acpi_check_dsm(adev_dimm->handle, to_nfit_uuid(i), 1, 1))
ba650cfc
LK		 1464 if (family < 0 || i == default_dsm_family)
1465 family = i;
31eca76b
DW		 1466
1467 /* limit the supported commands to those that are publicly documented */
ba650cfc 1468 nfit_mem->family = family;
095ab4b3
LK		 1469 if (override_dsm_mask && !disable_vendor_specific)
1470 dsm_mask = override_dsm_mask;
1471 else if (nfit_mem->family == NVDIMM_FAMILY_INTEL) {
31eca76b 1472 dsm_mask = 0x3fe;
87554098
DW		 1473 if (disable_vendor_specific)
1474 dsm_mask &= ~(1 << ND_CMD_VENDOR);
e02fb726 1475 } else if (nfit_mem->family == NVDIMM_FAMILY_HPE1) {
31eca76b 1476 dsm_mask = 0x1c3c76;
e02fb726 1477 } else if (nfit_mem->family == NVDIMM_FAMILY_HPE2) {
31eca76b 1478 dsm_mask = 0x1fe;
87554098
DW		 1479 if (disable_vendor_specific)
1480 dsm_mask &= ~(1 << 8);
e02fb726 1481 } else if (nfit_mem->family == NVDIMM_FAMILY_MSFT) {
1482 dsm_mask = 0xffffffff;
87554098 1483 } else {
a7225598 1484 dev_dbg(dev, "unknown dimm command family\n");
31eca76b 1485 nfit_mem->family = -1;
a7225598
DW		 1486 /* DSMs are optional, continue loading the driver... */
1487 return 0;
31eca76b
DW		 1488 }
1489
41c8bdb3 1490 guid = to_nfit_uuid(nfit_mem->family);
31eca76b 1491 for_each_set_bit(i, &dsm_mask, BITS_PER_LONG)
94116f81 1492 if (acpi_check_dsm(adev_dimm->handle, guid, 1, 1ULL << i))
62232e45
DW		 1493 set_bit(i, &nfit_mem->dsm_mask);
1494
60e95f43 1495 return 0;
62232e45
DW		 1496}
1497
ba9c8dd3
DW		 1498static void shutdown_dimm_notify(void *data)
1499{
1500 struct acpi_nfit_desc *acpi_desc = data;
1501 struct nfit_mem *nfit_mem;
1502
1503 mutex_lock(&acpi_desc->init_mutex);
1504 /*
1505 * Clear out the nfit_mem->flags_attr and shut down dimm event
1506 * notifications.
1507 */
1508 list_for_each_entry(nfit_mem, &acpi_desc->dimms, list) {
231bf117
DW		 1509 struct acpi_device *adev_dimm = nfit_mem->adev;
1510
ba9c8dd3
DW		 1511 if (nfit_mem->flags_attr) {
1512 sysfs_put(nfit_mem->flags_attr);
1513 nfit_mem->flags_attr = NULL;
1514 }
231bf117
DW		 1515 if (adev_dimm)
1516 acpi_remove_notify_handler(adev_dimm->handle,
1517 ACPI_DEVICE_NOTIFY, acpi_nvdimm_notify);
ba9c8dd3
DW		 1518 }
1519 mutex_unlock(&acpi_desc->init_mutex);
1520}
1521
e6dfb2de
DW		 1522static int acpi_nfit_register_dimms(struct acpi_nfit_desc *acpi_desc)
1523{
1524 struct nfit_mem *nfit_mem;
ba9c8dd3
DW		 1525 int dimm_count = 0, rc;
1526 struct nvdimm *nvdimm;
e6dfb2de
DW		 1527
1528 list_for_each_entry(nfit_mem, &acpi_desc->dimms, list) {
e5ae3b25 1529 struct acpi_nfit_flush_address *flush;
31eca76b 1530 unsigned long flags = 0, cmd_mask;
caa603aa 1531 struct nfit_memdev *nfit_memdev;
e6dfb2de 1532 u32 device_handle;
58138820 1533 u16 mem_flags;
e6dfb2de
DW		 1534
1535 device_handle = __to_nfit_memdev(nfit_mem)->device_handle;
1536 nvdimm = acpi_nfit_dimm_by_handle(acpi_desc, device_handle);
1537 if (nvdimm) {
20985164 1538 dimm_count++;
e6dfb2de
DW		 1539 continue;
1540 }
1541
1542 if (nfit_mem->bdw && nfit_mem->memdev_pmem)
8f078b38 1543 set_bit(NDD_ALIASING, &flags);
e6dfb2de 1544
caa603aa
DW		 1545 /* collate flags across all memdevs for this dimm */
1546 list_for_each_entry(nfit_memdev, &acpi_desc->memdevs, list) {
1547 struct acpi_nfit_memory_map *dimm_memdev;
1548
1549 dimm_memdev = __to_nfit_memdev(nfit_mem);
1550 if (dimm_memdev->device_handle
1551 != nfit_memdev->memdev->device_handle)
1552 continue;
1553 dimm_memdev->flags |= nfit_memdev->memdev->flags;
1554 }
1555
58138820 1556 mem_flags = __to_nfit_memdev(nfit_mem)->flags;
ca321d1c 1557 if (mem_flags & ACPI_NFIT_MEM_NOT_ARMED)
8f078b38 1558 set_bit(NDD_UNARMED, &flags);
58138820 1559
62232e45
DW		 1560 rc = acpi_nfit_add_dimm(acpi_desc, nfit_mem, device_handle);
1561 if (rc)
1562 continue;
1563
e3654eca 1564 /*
31eca76b
DW		 1565 * TODO: provide translation for non-NVDIMM_FAMILY_INTEL
1566 * devices (i.e. from nd_cmd to acpi_dsm) to standardize the
1567 * userspace interface.
e3654eca 1568 */
31eca76b
DW		 1569 cmd_mask = 1UL << ND_CMD_CALL;
1570 if (nfit_mem->family == NVDIMM_FAMILY_INTEL)
1571 cmd_mask |= nfit_mem->dsm_mask;
1572
e5ae3b25
DW		 1573 flush = nfit_mem->nfit_flush ? nfit_mem->nfit_flush->flush
1574 : NULL;
e6dfb2de 1575 nvdimm = nvdimm_create(acpi_desc->nvdimm_bus, nfit_mem,
62232e45 1576 acpi_nfit_dimm_attribute_groups,
e5ae3b25
DW		 1577 flags, cmd_mask, flush ? flush->hint_count : 0,
1578 nfit_mem->flush_wpq);
e6dfb2de
DW		 1579 if (!nvdimm)
1580 return -ENOMEM;
1581
1582 nfit_mem->nvdimm = nvdimm;
4d88a97a 1583 dimm_count++;
58138820
DW		 1584
1585 if ((mem_flags & ACPI_NFIT_MEM_FAILED_MASK) == 0)
1586 continue;
1587
1499934d 1588 dev_info(acpi_desc->dev, "%s flags:%s%s%s%s%s\n",
58138820 1589 nvdimm_name(nvdimm),
402bae59
TK		 1590 mem_flags & ACPI_NFIT_MEM_SAVE_FAILED ? " save_fail" : "",
1591 mem_flags & ACPI_NFIT_MEM_RESTORE_FAILED ? " restore_fail":"",
1592 mem_flags & ACPI_NFIT_MEM_FLUSH_FAILED ? " flush_fail" : "",
1499934d
DW		 1593 mem_flags & ACPI_NFIT_MEM_NOT_ARMED ? " not_armed" : "",
1594 mem_flags & ACPI_NFIT_MEM_MAP_FAILED ? " map_fail" : "");
58138820 1595
e6dfb2de
DW		 1596 }
1597
ba9c8dd3
DW		 1598 rc = nvdimm_bus_check_dimm_count(acpi_desc->nvdimm_bus, dimm_count);
1599 if (rc)
1600 return rc;
1601
1602 /*
1603 * Now that dimms are successfully registered, and async registration
1604 * is flushed, attempt to enable event notification.
1605 */
1606 list_for_each_entry(nfit_mem, &acpi_desc->dimms, list) {
1607 struct kernfs_node *nfit_kernfs;
1608
1609 nvdimm = nfit_mem->nvdimm;
1610 nfit_kernfs = sysfs_get_dirent(nvdimm_kobj(nvdimm)->sd, "nfit");
1611 if (nfit_kernfs)
1612 nfit_mem->flags_attr = sysfs_get_dirent(nfit_kernfs,
1613 "flags");
1614 sysfs_put(nfit_kernfs);
1615 if (!nfit_mem->flags_attr)
1616 dev_warn(acpi_desc->dev, "%s: notifications disabled\n",
1617 nvdimm_name(nvdimm));
1618 }
1619
1620 return devm_add_action_or_reset(acpi_desc->dev, shutdown_dimm_notify,
1621 acpi_desc);
e6dfb2de
DW		 1622}
1623
7db5bb33
JH		 1624/*
1625 * These constants are private because there are no kernel consumers of
1626 * these commands.
1627 */
1628enum nfit_aux_cmds {
1629 NFIT_CMD_TRANSLATE_SPA = 5,
1630 NFIT_CMD_ARS_INJECT_SET = 7,
1631 NFIT_CMD_ARS_INJECT_CLEAR = 8,
1632 NFIT_CMD_ARS_INJECT_GET = 9,
1633};
1634
62232e45
DW		 1635static void acpi_nfit_init_dsms(struct acpi_nfit_desc *acpi_desc)
1636{
1637 struct nvdimm_bus_descriptor *nd_desc = &acpi_desc->nd_desc;
41c8bdb3 1638 const guid_t *guid = to_nfit_uuid(NFIT_DEV_BUS);
62232e45 1639 struct acpi_device *adev;
7db5bb33 1640 unsigned long dsm_mask;
62232e45
DW		 1641 int i;
1642
e3654eca 1643 nd_desc->cmd_mask = acpi_desc->bus_cmd_force_en;
62232e45
DW		 1644 adev = to_acpi_dev(acpi_desc);
1645 if (!adev)
1646 return;
1647
d4f32367 1648 for (i = ND_CMD_ARS_CAP; i <= ND_CMD_CLEAR_ERROR; i++)
94116f81 1649 if (acpi_check_dsm(adev->handle, guid, 1, 1ULL << i))
e3654eca 1650 set_bit(i, &nd_desc->cmd_mask);
37d74841 1651 set_bit(ND_CMD_CALL, &nd_desc->cmd_mask);
7db5bb33
JH		 1652
1653 dsm_mask =
1654 (1 << ND_CMD_ARS_CAP) |
1655 (1 << ND_CMD_ARS_START) |
1656 (1 << ND_CMD_ARS_STATUS) |
1657 (1 << ND_CMD_CLEAR_ERROR) |
1658 (1 << NFIT_CMD_TRANSLATE_SPA) |
1659 (1 << NFIT_CMD_ARS_INJECT_SET) |
1660 (1 << NFIT_CMD_ARS_INJECT_CLEAR) |
1661 (1 << NFIT_CMD_ARS_INJECT_GET);
1662 for_each_set_bit(i, &dsm_mask, BITS_PER_LONG)
1663 if (acpi_check_dsm(adev->handle, guid, 1, 1ULL << i))
1664 set_bit(i, &nd_desc->bus_dsm_mask);
62232e45
DW		 1665}
1666
1f7df6f8
DW		 1667static ssize_t range_index_show(struct device *dev,
1668 struct device_attribute *attr, char *buf)
1669{
1670 struct nd_region *nd_region = to_nd_region(dev);
1671 struct nfit_spa *nfit_spa = nd_region_provider_data(nd_region);
1672
1673 return sprintf(buf, "%d\n", nfit_spa->spa->range_index);
1674}
1675static DEVICE_ATTR_RO(range_index);
1676
1677static struct attribute *acpi_nfit_region_attributes[] = {
1678 &dev_attr_range_index.attr,
1679 NULL,
1680};
1681
5e93746f 1682static const struct attribute_group acpi_nfit_region_attribute_group = {
1f7df6f8
DW		 1683 .name = "nfit",
1684 .attrs = acpi_nfit_region_attributes,
1685};
1686
1687static const struct attribute_group *acpi_nfit_region_attribute_groups[] = {
1688 &nd_region_attribute_group,
1689 &nd_mapping_attribute_group,
3d88002e 1690 &nd_device_attribute_group,
74ae66c3 1691 &nd_numa_attribute_group,
1f7df6f8
DW		 1692 &acpi_nfit_region_attribute_group,
1693 NULL,
1694};
1695
eaf96153
DW		 1696/* enough info to uniquely specify an interleave set */
1697struct nfit_set_info {
1698 struct nfit_set_info_map {
1699 u64 region_offset;
1700 u32 serial_number;
1701 u32 pad;
1702 } mapping[0];
1703};
1704
c12c48ce
DW		 1705struct nfit_set_info2 {
1706 struct nfit_set_info_map2 {
1707 u64 region_offset;
1708 u32 serial_number;
1709 u16 vendor_id;
1710 u16 manufacturing_date;
1711 u8 manufacturing_location;
1712 u8 reserved[31];
1713 } mapping[0];
1714};
1715
eaf96153
DW		 1716static size_t sizeof_nfit_set_info(int num_mappings)
1717{
1718 return sizeof(struct nfit_set_info)
1719 + num_mappings * sizeof(struct nfit_set_info_map);
1720}
1721
c12c48ce
DW		 1722static size_t sizeof_nfit_set_info2(int num_mappings)
1723{
1724 return sizeof(struct nfit_set_info2)
1725 + num_mappings * sizeof(struct nfit_set_info_map2);
1726}
1727
86ef58a4 1728static int cmp_map_compat(const void *m0, const void *m1)
eaf96153
DW		 1729{
1730 const struct nfit_set_info_map *map0 = m0;
1731 const struct nfit_set_info_map *map1 = m1;
1732
1733 return memcmp(&map0->region_offset, &map1->region_offset,
1734 sizeof(u64));
1735}
1736
86ef58a4
DW		 1737static int cmp_map(const void *m0, const void *m1)
1738{
1739 const struct nfit_set_info_map *map0 = m0;
1740 const struct nfit_set_info_map *map1 = m1;
1741
b03b99a3
DW		 1742 if (map0->region_offset < map1->region_offset)
1743 return -1;
1744 else if (map0->region_offset > map1->region_offset)
1745 return 1;
1746 return 0;
86ef58a4
DW		 1747}
1748
c12c48ce
DW		 1749static int cmp_map2(const void *m0, const void *m1)
1750{
1751 const struct nfit_set_info_map2 *map0 = m0;
1752 const struct nfit_set_info_map2 *map1 = m1;
1753
1754 if (map0->region_offset < map1->region_offset)
1755 return -1;
1756 else if (map0->region_offset > map1->region_offset)
1757 return 1;
1758 return 0;
1759}
1760
eaf96153
DW		 1761/* Retrieve the nth entry referencing this spa */
1762static struct acpi_nfit_memory_map *memdev_from_spa(
1763 struct acpi_nfit_desc *acpi_desc, u16 range_index, int n)
1764{
1765 struct nfit_memdev *nfit_memdev;
1766
1767 list_for_each_entry(nfit_memdev, &acpi_desc->memdevs, list)
1768 if (nfit_memdev->memdev->range_index == range_index)
1769 if (n-- == 0)
1770 return nfit_memdev->memdev;
1771 return NULL;
1772}
1773
1774static int acpi_nfit_init_interleave_set(struct acpi_nfit_desc *acpi_desc,
1775 struct nd_region_desc *ndr_desc,
1776 struct acpi_nfit_system_address *spa)
1777{
eaf96153
DW		 1778 struct device *dev = acpi_desc->dev;
1779 struct nd_interleave_set *nd_set;
1780 u16 nr = ndr_desc->num_mappings;
c12c48ce 1781 struct nfit_set_info2 *info2;
eaf96153 1782 struct nfit_set_info *info;
8f2bc243 1783 int i;
eaf96153 1784
faec6f8a
DW		 1785 nd_set = devm_kzalloc(dev, sizeof(*nd_set), GFP_KERNEL);
1786 if (!nd_set)
1787 return -ENOMEM;
1788 ndr_desc->nd_set = nd_set;
1789 guid_copy(&nd_set->type_guid, (guid_t *) spa->range_guid);
1790
eaf96153
DW		 1791 info = devm_kzalloc(dev, sizeof_nfit_set_info(nr), GFP_KERNEL);
1792 if (!info)
1793 return -ENOMEM;
c12c48ce
DW		 1794
1795 info2 = devm_kzalloc(dev, sizeof_nfit_set_info2(nr), GFP_KERNEL);
1796 if (!info2)
1797 return -ENOMEM;
1798
eaf96153 1799 for (i = 0; i < nr; i++) {
44c462eb 1800 struct nd_mapping_desc *mapping = &ndr_desc->mapping[i];
eaf96153 1801 struct nfit_set_info_map *map = &info->mapping[i];
c12c48ce 1802 struct nfit_set_info_map2 *map2 = &info2->mapping[i];
44c462eb 1803 struct nvdimm *nvdimm = mapping->nvdimm;
eaf96153
DW		 1804 struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
1805 struct acpi_nfit_memory_map *memdev = memdev_from_spa(acpi_desc,
1806 spa->range_index, i);
1807
1808 if (!memdev || !nfit_mem->dcr) {
1809 dev_err(dev, "%s: failed to find DCR\n", __func__);
1810 return -ENODEV;
1811 }
1812
1813 map->region_offset = memdev->region_offset;
1814 map->serial_number = nfit_mem->dcr->serial_number;
c12c48ce
DW		 1815
1816 map2->region_offset = memdev->region_offset;
1817 map2->serial_number = nfit_mem->dcr->serial_number;
1818 map2->vendor_id = nfit_mem->dcr->vendor_id;
1819 map2->manufacturing_date = nfit_mem->dcr->manufacturing_date;
1820 map2->manufacturing_location = nfit_mem->dcr->manufacturing_location;
eaf96153
DW		 1821 }
1822
c12c48ce 1823 /* v1.1 namespaces */
eaf96153
DW		 1824 sort(&info->mapping[0], nr, sizeof(struct nfit_set_info_map),
1825 cmp_map, NULL);
c12c48ce
DW		 1826 nd_set->cookie1 = nd_fletcher64(info, sizeof_nfit_set_info(nr), 0);
1827
1828 /* v1.2 namespaces */
1829 sort(&info2->mapping[0], nr, sizeof(struct nfit_set_info_map2),
1830 cmp_map2, NULL);
1831 nd_set->cookie2 = nd_fletcher64(info2, sizeof_nfit_set_info2(nr), 0);
86ef58a4 1832
c12c48ce 1833 /* support v1.1 namespaces created with the wrong sort order */
86ef58a4
DW		 1834 sort(&info->mapping[0], nr, sizeof(struct nfit_set_info_map),
1835 cmp_map_compat, NULL);
1836 nd_set->altcookie = nd_fletcher64(info, sizeof_nfit_set_info(nr), 0);
1837
401c0a19
DW		 1838 /* record the result of the sort for the mapping position */
1839 for (i = 0; i < nr; i++) {
1840 struct nfit_set_info_map2 *map2 = &info2->mapping[i];
1841 int j;
1842
1843 for (j = 0; j < nr; j++) {
1844 struct nd_mapping_desc *mapping = &ndr_desc->mapping[j];
1845 struct nvdimm *nvdimm = mapping->nvdimm;
1846 struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
1847
1848 if (map2->serial_number
1849 == nfit_mem->dcr->serial_number &&
1850 map2->vendor_id
1851 == nfit_mem->dcr->vendor_id &&
1852 map2->manufacturing_date
1853 == nfit_mem->dcr->manufacturing_date &&
1854 map2->manufacturing_location
1855 == nfit_mem->dcr->manufacturing_location) {
1856 mapping->position = i;
1857 break;
1858 }
1859 }
1860 }
1861
eaf96153
DW		 1862 ndr_desc->nd_set = nd_set;
1863 devm_kfree(dev, info);
c12c48ce 1864 devm_kfree(dev, info2);
eaf96153
DW		 1865
1866 return 0;
1867}
1868
047fc8a1
RZ		 1869static u64 to_interleave_offset(u64 offset, struct nfit_blk_mmio *mmio)
1870{
1871 struct acpi_nfit_interleave *idt = mmio->idt;
1872 u32 sub_line_offset, line_index, line_offset;
1873 u64 line_no, table_skip_count, table_offset;
1874
1875 line_no = div_u64_rem(offset, mmio->line_size, &sub_line_offset);
1876 table_skip_count = div_u64_rem(line_no, mmio->num_lines, &line_index);
1877 line_offset = idt->line_offset[line_index]
1878 * mmio->line_size;
1879 table_offset = table_skip_count * mmio->table_size;
1880
1881 return mmio->base_offset + line_offset + table_offset + sub_line_offset;
1882}
1883
de4a196c 1884static u32 read_blk_stat(struct nfit_blk *nfit_blk, unsigned int bw)
047fc8a1
RZ		 1885{
1886 struct nfit_blk_mmio *mmio = &nfit_blk->mmio[DCR];
1887 u64 offset = nfit_blk->stat_offset + mmio->size * bw;
68202c9f 1888 const u32 STATUS_MASK = 0x80000037;
047fc8a1
RZ		 1889
1890 if (mmio->num_lines)
1891 offset = to_interleave_offset(offset, mmio);
1892
68202c9f 1893 return readl(mmio->addr.base + offset) & STATUS_MASK;
047fc8a1
RZ		 1894}
1895
1896static void write_blk_ctl(struct nfit_blk *nfit_blk, unsigned int bw,
1897 resource_size_t dpa, unsigned int len, unsigned int write)
1898{
1899 u64 cmd, offset;
1900 struct nfit_blk_mmio *mmio = &nfit_blk->mmio[DCR];
1901
1902 enum {
1903 BCW_OFFSET_MASK = (1ULL << 48)-1,
1904 BCW_LEN_SHIFT = 48,
1905 BCW_LEN_MASK = (1ULL << 8) - 1,
1906 BCW_CMD_SHIFT = 56,
1907 };
1908
1909 cmd = (dpa >> L1_CACHE_SHIFT) & BCW_OFFSET_MASK;
1910 len = len >> L1_CACHE_SHIFT;
1911 cmd |= ((u64) len & BCW_LEN_MASK) << BCW_LEN_SHIFT;
1912 cmd |= ((u64) write) << BCW_CMD_SHIFT;
1913
1914 offset = nfit_blk->cmd_offset + mmio->size * bw;
1915 if (mmio->num_lines)
1916 offset = to_interleave_offset(offset, mmio);
1917
67a3e8fe 1918 writeq(cmd, mmio->addr.base + offset);
f284a4f2 1919 nvdimm_flush(nfit_blk->nd_region);
f0f2c072 1920
aef25338 1921 if (nfit_blk->dimm_flags & NFIT_BLK_DCR_LATCH)
67a3e8fe 1922 readq(mmio->addr.base + offset);
047fc8a1
RZ		 1923}
1924
1925static int acpi_nfit_blk_single_io(struct nfit_blk *nfit_blk,
1926 resource_size_t dpa, void *iobuf, size_t len, int rw,
1927 unsigned int lane)
1928{
1929 struct nfit_blk_mmio *mmio = &nfit_blk->mmio[BDW];
1930 unsigned int copied = 0;
1931 u64 base_offset;
1932 int rc;
1933
1934 base_offset = nfit_blk->bdw_offset + dpa % L1_CACHE_BYTES
1935 + lane * mmio->size;
047fc8a1
RZ		 1936 write_blk_ctl(nfit_blk, lane, dpa, len, rw);
1937 while (len) {
1938 unsigned int c;
1939 u64 offset;
1940
1941 if (mmio->num_lines) {
1942 u32 line_offset;
1943
1944 offset = to_interleave_offset(base_offset + copied,
1945 mmio);
1946 div_u64_rem(offset, mmio->line_size, &line_offset);
1947 c = min_t(size_t, len, mmio->line_size - line_offset);
1948 } else {
1949 offset = base_offset + nfit_blk->bdw_offset;
1950 c = len;
1951 }
1952
1953 if (rw)
0aed55af 1954 memcpy_flushcache(mmio->addr.aperture + offset, iobuf + copied, c);
67a3e8fe 1955 else {
aef25338 1956 if (nfit_blk->dimm_flags & NFIT_BLK_READ_FLUSH)
67a3e8fe
RZ		 1957 mmio_flush_range((void __force *)
1958 mmio->addr.aperture + offset, c);
1959
6abccd1b 1960 memcpy(iobuf + copied, mmio->addr.aperture + offset, c);
67a3e8fe 1961 }
047fc8a1
RZ		 1962
1963 copied += c;
1964 len -= c;
1965 }
c2ad2954
RZ		 1966
1967 if (rw)
f284a4f2 1968 nvdimm_flush(nfit_blk->nd_region);
c2ad2954 1969
047fc8a1
RZ		 1970 rc = read_blk_stat(nfit_blk, lane) ? -EIO : 0;
1971 return rc;
1972}
1973
1974static int acpi_nfit_blk_region_do_io(struct nd_blk_region *ndbr,
1975 resource_size_t dpa, void *iobuf, u64 len, int rw)
1976{
1977 struct nfit_blk *nfit_blk = nd_blk_region_provider_data(ndbr);
1978 struct nfit_blk_mmio *mmio = &nfit_blk->mmio[BDW];
1979 struct nd_region *nd_region = nfit_blk->nd_region;
1980 unsigned int lane, copied = 0;
1981 int rc = 0;
1982
1983 lane = nd_region_acquire_lane(nd_region);
1984 while (len) {
1985 u64 c = min(len, mmio->size);
1986
1987 rc = acpi_nfit_blk_single_io(nfit_blk, dpa + copied,
1988 iobuf + copied, c, rw, lane);
1989 if (rc)
1990 break;
1991
1992 copied += c;
1993 len -= c;
1994 }
1995 nd_region_release_lane(nd_region, lane);
1996
1997 return rc;
1998}
1999
047fc8a1
RZ		 2000static int nfit_blk_init_interleave(struct nfit_blk_mmio *mmio,
2001 struct acpi_nfit_interleave *idt, u16 interleave_ways)
2002{
2003 if (idt) {
2004 mmio->num_lines = idt->line_count;
2005 mmio->line_size = idt->line_size;
2006 if (interleave_ways == 0)
2007 return -ENXIO;
2008 mmio->table_size = mmio->num_lines * interleave_ways
2009 * mmio->line_size;
2010 }
2011
2012 return 0;
2013}
2014
f0f2c072
RZ		 2015static int acpi_nfit_blk_get_flags(struct nvdimm_bus_descriptor *nd_desc,
2016 struct nvdimm *nvdimm, struct nfit_blk *nfit_blk)
2017{
2018 struct nd_cmd_dimm_flags flags;
2019 int rc;
2020
2021 memset(&flags, 0, sizeof(flags));
2022 rc = nd_desc->ndctl(nd_desc, nvdimm, ND_CMD_DIMM_FLAGS, &flags,
aef25338 2023 sizeof(flags), NULL);
f0f2c072
RZ		 2024
2025 if (rc >= 0 && flags.status == 0)
2026 nfit_blk->dimm_flags = flags.flags;
2027 else if (rc == -ENOTTY) {
2028 /* fall back to a conservative default */
aef25338 2029 nfit_blk->dimm_flags = NFIT_BLK_DCR_LATCH | NFIT_BLK_READ_FLUSH;
f0f2c072
RZ		 2030 rc = 0;
2031 } else
2032 rc = -ENXIO;
2033
2034 return rc;
2035}
2036
047fc8a1
RZ		 2037static int acpi_nfit_blk_region_enable(struct nvdimm_bus *nvdimm_bus,
2038 struct device *dev)
2039{
2040 struct nvdimm_bus_descriptor *nd_desc = to_nd_desc(nvdimm_bus);
047fc8a1
RZ		 2041 struct nd_blk_region *ndbr = to_nd_blk_region(dev);
2042 struct nfit_blk_mmio *mmio;
2043 struct nfit_blk *nfit_blk;
2044 struct nfit_mem *nfit_mem;
2045 struct nvdimm *nvdimm;
2046 int rc;
2047
2048 nvdimm = nd_blk_region_to_dimm(ndbr);
2049 nfit_mem = nvdimm_provider_data(nvdimm);
2050 if (!nfit_mem || !nfit_mem->dcr || !nfit_mem->bdw) {
2051 dev_dbg(dev, "%s: missing%s%s%s\n", __func__,
2052 nfit_mem ? "" : " nfit_mem",
193ccca4
DW		 2053 (nfit_mem && nfit_mem->dcr) ? "" : " dcr",
2054 (nfit_mem && nfit_mem->bdw) ? "" : " bdw");
047fc8a1
RZ		 2055 return -ENXIO;
2056 }
2057
2058 nfit_blk = devm_kzalloc(dev, sizeof(*nfit_blk), GFP_KERNEL);
2059 if (!nfit_blk)
2060 return -ENOMEM;
2061 nd_blk_region_set_provider_data(ndbr, nfit_blk);
2062 nfit_blk->nd_region = to_nd_region(dev);
2063
2064 /* map block aperture memory */
2065 nfit_blk->bdw_offset = nfit_mem->bdw->offset;
2066 mmio = &nfit_blk->mmio[BDW];
29b9aa0a 2067 mmio->addr.base = devm_nvdimm_memremap(dev, nfit_mem->spa_bdw->address,
ca6a4657 2068 nfit_mem->spa_bdw->length, nd_blk_memremap_flags(ndbr));
67a3e8fe 2069 if (!mmio->addr.base) {
047fc8a1
RZ		 2070 dev_dbg(dev, "%s: %s failed to map bdw\n", __func__,
2071 nvdimm_name(nvdimm));
2072 return -ENOMEM;
2073 }
2074 mmio->size = nfit_mem->bdw->size;
2075 mmio->base_offset = nfit_mem->memdev_bdw->region_offset;
2076 mmio->idt = nfit_mem->idt_bdw;
2077 mmio->spa = nfit_mem->spa_bdw;
2078 rc = nfit_blk_init_interleave(mmio, nfit_mem->idt_bdw,
2079 nfit_mem->memdev_bdw->interleave_ways);
2080 if (rc) {
2081 dev_dbg(dev, "%s: %s failed to init bdw interleave\n",
2082 __func__, nvdimm_name(nvdimm));
2083 return rc;
2084 }
2085
2086 /* map block control memory */
2087 nfit_blk->cmd_offset = nfit_mem->dcr->command_offset;
2088 nfit_blk->stat_offset = nfit_mem->dcr->status_offset;
2089 mmio = &nfit_blk->mmio[DCR];
29b9aa0a
DW		 2090 mmio->addr.base = devm_nvdimm_ioremap(dev, nfit_mem->spa_dcr->address,
2091 nfit_mem->spa_dcr->length);
67a3e8fe 2092 if (!mmio->addr.base) {
047fc8a1
RZ		 2093 dev_dbg(dev, "%s: %s failed to map dcr\n", __func__,
2094 nvdimm_name(nvdimm));
2095 return -ENOMEM;
2096 }
2097 mmio->size = nfit_mem->dcr->window_size;
2098 mmio->base_offset = nfit_mem->memdev_dcr->region_offset;
2099 mmio->idt = nfit_mem->idt_dcr;
2100 mmio->spa = nfit_mem->spa_dcr;
2101 rc = nfit_blk_init_interleave(mmio, nfit_mem->idt_dcr,
2102 nfit_mem->memdev_dcr->interleave_ways);
2103 if (rc) {
2104 dev_dbg(dev, "%s: %s failed to init dcr interleave\n",
2105 __func__, nvdimm_name(nvdimm));
2106 return rc;
2107 }
2108
f0f2c072
RZ		 2109 rc = acpi_nfit_blk_get_flags(nd_desc, nvdimm, nfit_blk);
2110 if (rc < 0) {
2111 dev_dbg(dev, "%s: %s failed get DIMM flags\n",
2112 __func__, nvdimm_name(nvdimm));
2113 return rc;
2114 }
2115
f284a4f2 2116 if (nvdimm_has_flush(nfit_blk->nd_region) < 0)
c2ad2954
RZ		 2117 dev_warn(dev, "unable to guarantee persistence of writes\n");
2118
047fc8a1
RZ		 2119 if (mmio->line_size == 0)
2120 return 0;
2121
2122 if ((u32) nfit_blk->cmd_offset % mmio->line_size
2123 + 8 > mmio->line_size) {
2124 dev_dbg(dev, "cmd_offset crosses interleave boundary\n");
2125 return -ENXIO;
2126 } else if ((u32) nfit_blk->stat_offset % mmio->line_size
2127 + 8 > mmio->line_size) {
2128 dev_dbg(dev, "stat_offset crosses interleave boundary\n");
2129 return -ENXIO;
2130 }
2131
2132 return 0;
2133}
2134
aef25338 2135static int ars_get_cap(struct acpi_nfit_desc *acpi_desc,
1cf03c00 2136 struct nd_cmd_ars_cap *cmd, struct nfit_spa *nfit_spa)
0caeef63 2137{
aef25338 2138 struct nvdimm_bus_descriptor *nd_desc = &acpi_desc->nd_desc;
1cf03c00 2139 struct acpi_nfit_system_address *spa = nfit_spa->spa;
aef25338
DW		 2140 int cmd_rc, rc;
2141
1cf03c00
DW		 2142 cmd->address = spa->address;
2143 cmd->length = spa->length;
aef25338
DW		 2144 rc = nd_desc->ndctl(nd_desc, NULL, ND_CMD_ARS_CAP, cmd,
2145 sizeof(*cmd), &cmd_rc);
2146 if (rc < 0)
2147 return rc;
1cf03c00 2148 return cmd_rc;
0caeef63
VV		 2149}
2150
1cf03c00 2151static int ars_start(struct acpi_nfit_desc *acpi_desc, struct nfit_spa *nfit_spa)
0caeef63
VV		 2152{
2153 int rc;
1cf03c00
DW		 2154 int cmd_rc;
2155 struct nd_cmd_ars_start ars_start;
2156 struct acpi_nfit_system_address *spa = nfit_spa->spa;
2157 struct nvdimm_bus_descriptor *nd_desc = &acpi_desc->nd_desc;
0caeef63 2158
1cf03c00
DW		 2159 memset(&ars_start, 0, sizeof(ars_start));
2160 ars_start.address = spa->address;
2161 ars_start.length = spa->length;
80790039 2162 ars_start.flags = acpi_desc->ars_start_flags;
1cf03c00
DW		 2163 if (nfit_spa_type(spa) == NFIT_SPA_PM)
2164 ars_start.type = ND_ARS_PERSISTENT;
2165 else if (nfit_spa_type(spa) == NFIT_SPA_VOLATILE)
2166 ars_start.type = ND_ARS_VOLATILE;
2167 else
2168 return -ENOTTY;
aef25338 2169
1cf03c00
DW		 2170 rc = nd_desc->ndctl(nd_desc, NULL, ND_CMD_ARS_START, &ars_start,
2171 sizeof(ars_start), &cmd_rc);
aef25338 2172
1cf03c00
DW		 2173 if (rc < 0)
2174 return rc;
2175 return cmd_rc;
0caeef63
VV		 2176}
2177
1cf03c00 2178static int ars_continue(struct acpi_nfit_desc *acpi_desc)
0caeef63 2179{
aef25338 2180 int rc, cmd_rc;
1cf03c00
DW		 2181 struct nd_cmd_ars_start ars_start;
2182 struct nvdimm_bus_descriptor *nd_desc = &acpi_desc->nd_desc;
2183 struct nd_cmd_ars_status *ars_status = acpi_desc->ars_status;
2184
2185 memset(&ars_start, 0, sizeof(ars_start));
2186 ars_start.address = ars_status->restart_address;
2187 ars_start.length = ars_status->restart_length;
2188 ars_start.type = ars_status->type;
80790039 2189 ars_start.flags = acpi_desc->ars_start_flags;
1cf03c00
DW		 2190 rc = nd_desc->ndctl(nd_desc, NULL, ND_CMD_ARS_START, &ars_start,
2191 sizeof(ars_start), &cmd_rc);
2192 if (rc < 0)
2193 return rc;
2194 return cmd_rc;
2195}
0caeef63 2196
1cf03c00
DW		 2197static int ars_get_status(struct acpi_nfit_desc *acpi_desc)
2198{
2199 struct nvdimm_bus_descriptor *nd_desc = &acpi_desc->nd_desc;
2200 struct nd_cmd_ars_status *ars_status = acpi_desc->ars_status;
2201 int rc, cmd_rc;
aef25338 2202
1cf03c00
DW		 2203 rc = nd_desc->ndctl(nd_desc, NULL, ND_CMD_ARS_STATUS, ars_status,
2204 acpi_desc->ars_status_size, &cmd_rc);
2205 if (rc < 0)
2206 return rc;
2207 return cmd_rc;
0caeef63
VV		 2208}
2209
82aa37cf 2210static int ars_status_process_records(struct acpi_nfit_desc *acpi_desc,
1cf03c00 2211 struct nd_cmd_ars_status *ars_status)
0caeef63 2212{
82aa37cf 2213 struct nvdimm_bus *nvdimm_bus = acpi_desc->nvdimm_bus;
0caeef63
VV		 2214 int rc;
2215 u32 i;
2216
82aa37cf
DW		 2217 /*
2218 * First record starts at 44 byte offset from the start of the
2219 * payload.
2220 */
2221 if (ars_status->out_length < 44)
2222 return 0;
0caeef63 2223 for (i = 0; i < ars_status->num_records; i++) {
82aa37cf
DW		 2224 /* only process full records */
2225 if (ars_status->out_length
2226 < 44 + sizeof(struct nd_ars_record) * (i + 1))
2227 break;
0caeef63
VV		 2228 rc = nvdimm_bus_add_poison(nvdimm_bus,
2229 ars_status->records[i].err_address,
2230 ars_status->records[i].length);
2231 if (rc)
2232 return rc;
2233 }
82aa37cf
DW		 2234 if (i < ars_status->num_records)
2235 dev_warn(acpi_desc->dev, "detected truncated ars results\n");
0caeef63
VV		 2236
2237 return 0;
2238}
2239
af1996ef
TK		 2240static void acpi_nfit_remove_resource(void *data)
2241{
2242 struct resource *res = data;
2243
2244 remove_resource(res);
2245}
2246
2247static int acpi_nfit_insert_resource(struct acpi_nfit_desc *acpi_desc,
2248 struct nd_region_desc *ndr_desc)
2249{
2250 struct resource *res, *nd_res = ndr_desc->res;
2251 int is_pmem, ret;
2252
2253 /* No operation if the region is already registered as PMEM */
2254 is_pmem = region_intersects(nd_res->start, resource_size(nd_res),
2255 IORESOURCE_MEM, IORES_DESC_PERSISTENT_MEMORY);
2256 if (is_pmem == REGION_INTERSECTS)
2257 return 0;
2258
2259 res = devm_kzalloc(acpi_desc->dev, sizeof(*res), GFP_KERNEL);
2260 if (!res)
2261 return -ENOMEM;
2262
2263 res->name = "Persistent Memory";
2264 res->start = nd_res->start;
2265 res->end = nd_res->end;
2266 res->flags = IORESOURCE_MEM;
2267 res->desc = IORES_DESC_PERSISTENT_MEMORY;
2268
2269 ret = insert_resource(&iomem_resource, res);
2270 if (ret)
2271 return ret;
2272
d932dd2c
SV		 2273 ret = devm_add_action_or_reset(acpi_desc->dev,
2274 acpi_nfit_remove_resource,
2275 res);
2276 if (ret)
af1996ef 2277 return ret;
af1996ef
TK		 2278
2279 return 0;
2280}
2281
1f7df6f8 2282static int acpi_nfit_init_mapping(struct acpi_nfit_desc *acpi_desc,
44c462eb 2283 struct nd_mapping_desc *mapping, struct nd_region_desc *ndr_desc,
1f7df6f8 2284 struct acpi_nfit_memory_map *memdev,
1cf03c00 2285 struct nfit_spa *nfit_spa)
1f7df6f8
DW		 2286{
2287 struct nvdimm *nvdimm = acpi_nfit_dimm_by_handle(acpi_desc,
2288 memdev->device_handle);
1cf03c00 2289 struct acpi_nfit_system_address *spa = nfit_spa->spa;
047fc8a1 2290 struct nd_blk_region_desc *ndbr_desc;
1f7df6f8 2291 struct nfit_mem *nfit_mem;
faec6f8a 2292 int blk_valid = 0, rc;
1f7df6f8
DW		 2293
2294 if (!nvdimm) {
2295 dev_err(acpi_desc->dev, "spa%d dimm: %#x not found\n",
2296 spa->range_index, memdev->device_handle);
2297 return -ENODEV;
2298 }
2299
44c462eb 2300 mapping->nvdimm = nvdimm;
1f7df6f8
DW		 2301 switch (nfit_spa_type(spa)) {
2302 case NFIT_SPA_PM:
2303 case NFIT_SPA_VOLATILE:
44c462eb
DW		 2304 mapping->start = memdev->address;
2305 mapping->size = memdev->region_size;
1f7df6f8
DW		 2306 break;
2307 case NFIT_SPA_DCR:
2308 nfit_mem = nvdimm_provider_data(nvdimm);
2309 if (!nfit_mem || !nfit_mem->bdw) {
2310 dev_dbg(acpi_desc->dev, "spa%d %s missing bdw\n",
2311 spa->range_index, nvdimm_name(nvdimm));
2312 } else {
44c462eb
DW		 2313 mapping->size = nfit_mem->bdw->capacity;
2314 mapping->start = nfit_mem->bdw->start_address;
5212e11f 2315 ndr_desc->num_lanes = nfit_mem->bdw->windows;
1f7df6f8
DW		 2316 blk_valid = 1;
2317 }
2318
44c462eb 2319 ndr_desc->mapping = mapping;
1f7df6f8 2320 ndr_desc->num_mappings = blk_valid;
047fc8a1
RZ		 2321 ndbr_desc = to_blk_region_desc(ndr_desc);
2322 ndbr_desc->enable = acpi_nfit_blk_region_enable;
6bc75619 2323 ndbr_desc->do_io = acpi_desc->blk_do_io;
faec6f8a
DW		 2324 rc = acpi_nfit_init_interleave_set(acpi_desc, ndr_desc, spa);
2325 if (rc)
2326 return rc;
1cf03c00
DW		 2327 nfit_spa->nd_region = nvdimm_blk_region_create(acpi_desc->nvdimm_bus,
2328 ndr_desc);
2329 if (!nfit_spa->nd_region)
1f7df6f8
DW		 2330 return -ENOMEM;
2331 break;
2332 }
2333
2334 return 0;
2335}
2336
c2f32acd
LCY		 2337static bool nfit_spa_is_virtual(struct acpi_nfit_system_address *spa)
2338{
2339 return (nfit_spa_type(spa) == NFIT_SPA_VDISK ||
2340 nfit_spa_type(spa) == NFIT_SPA_VCD ||
2341 nfit_spa_type(spa) == NFIT_SPA_PDISK ||
2342 nfit_spa_type(spa) == NFIT_SPA_PCD);
2343}
2344
c9e582aa
DW		 2345static bool nfit_spa_is_volatile(struct acpi_nfit_system_address *spa)
2346{
2347 return (nfit_spa_type(spa) == NFIT_SPA_VDISK ||
2348 nfit_spa_type(spa) == NFIT_SPA_VCD ||
2349 nfit_spa_type(spa) == NFIT_SPA_VOLATILE);
2350}
2351
1f7df6f8
DW		 2352static int acpi_nfit_register_region(struct acpi_nfit_desc *acpi_desc,
2353 struct nfit_spa *nfit_spa)
2354{
44c462eb 2355 static struct nd_mapping_desc mappings[ND_MAX_MAPPINGS];
1f7df6f8 2356 struct acpi_nfit_system_address *spa = nfit_spa->spa;
047fc8a1
RZ		 2357 struct nd_blk_region_desc ndbr_desc;
2358 struct nd_region_desc *ndr_desc;
1f7df6f8 2359 struct nfit_memdev *nfit_memdev;
1f7df6f8
DW		 2360 struct nvdimm_bus *nvdimm_bus;
2361 struct resource res;
eaf96153 2362 int count = 0, rc;
1f7df6f8 2363
1cf03c00 2364 if (nfit_spa->nd_region)
20985164
VV		 2365 return 0;
2366
c2f32acd 2367 if (spa->range_index == 0 && !nfit_spa_is_virtual(spa)) {
1f7df6f8
DW		 2368 dev_dbg(acpi_desc->dev, "%s: detected invalid spa index\n",
2369 __func__);
2370 return 0;
2371 }
2372
2373 memset(&res, 0, sizeof(res));
44c462eb 2374 memset(&mappings, 0, sizeof(mappings));
047fc8a1 2375 memset(&ndbr_desc, 0, sizeof(ndbr_desc));
1f7df6f8
DW		 2376 res.start = spa->address;
2377 res.end = res.start + spa->length - 1;
047fc8a1
RZ		 2378 ndr_desc = &ndbr_desc.ndr_desc;
2379 ndr_desc->res = &res;
2380 ndr_desc->provider_data = nfit_spa;
2381 ndr_desc->attr_groups = acpi_nfit_region_attribute_groups;
41d7a6d6
TK		 2382 if (spa->flags & ACPI_NFIT_PROXIMITY_VALID)
2383 ndr_desc->numa_node = acpi_map_pxm_to_online_node(
2384 spa->proximity_domain);
2385 else
2386 ndr_desc->numa_node = NUMA_NO_NODE;
2387
1f7df6f8
DW		 2388 list_for_each_entry(nfit_memdev, &acpi_desc->memdevs, list) {
2389 struct acpi_nfit_memory_map *memdev = nfit_memdev->memdev;
44c462eb 2390 struct nd_mapping_desc *mapping;
1f7df6f8
DW		 2391
2392 if (memdev->range_index != spa->range_index)
2393 continue;
2394 if (count >= ND_MAX_MAPPINGS) {
2395 dev_err(acpi_desc->dev, "spa%d exceeds max mappings %d\n",
2396 spa->range_index, ND_MAX_MAPPINGS);
2397 return -ENXIO;
2398 }
44c462eb
DW		 2399 mapping = &mappings[count++];
2400 rc = acpi_nfit_init_mapping(acpi_desc, mapping, ndr_desc,
1cf03c00 2401 memdev, nfit_spa);
1f7df6f8 2402 if (rc)
1cf03c00 2403 goto out;
1f7df6f8
DW		 2404 }
2405
44c462eb 2406 ndr_desc->mapping = mappings;
047fc8a1
RZ		 2407 ndr_desc->num_mappings = count;
2408 rc = acpi_nfit_init_interleave_set(acpi_desc, ndr_desc, spa);
eaf96153 2409 if (rc)
1cf03c00 2410 goto out;
eaf96153 2411
1f7df6f8
DW		 2412 nvdimm_bus = acpi_desc->nvdimm_bus;
2413 if (nfit_spa_type(spa) == NFIT_SPA_PM) {
af1996ef 2414 rc = acpi_nfit_insert_resource(acpi_desc, ndr_desc);
48901165 2415 if (rc) {
af1996ef
TK		 2416 dev_warn(acpi_desc->dev,
2417 "failed to insert pmem resource to iomem: %d\n",
2418 rc);
48901165 2419 goto out;
0caeef63 2420 }
48901165 2421
1cf03c00
DW		 2422 nfit_spa->nd_region = nvdimm_pmem_region_create(nvdimm_bus,
2423 ndr_desc);
2424 if (!nfit_spa->nd_region)
2425 rc = -ENOMEM;
c9e582aa 2426 } else if (nfit_spa_is_volatile(spa)) {
1cf03c00
DW		 2427 nfit_spa->nd_region = nvdimm_volatile_region_create(nvdimm_bus,
2428 ndr_desc);
2429 if (!nfit_spa->nd_region)
2430 rc = -ENOMEM;
c2f32acd
LCY		 2431 } else if (nfit_spa_is_virtual(spa)) {
2432 nfit_spa->nd_region = nvdimm_pmem_region_create(nvdimm_bus,
2433 ndr_desc);
2434 if (!nfit_spa->nd_region)
2435 rc = -ENOMEM;
1f7df6f8 2436 }
20985164 2437
1cf03c00
DW		 2438 out:
2439 if (rc)
2440 dev_err(acpi_desc->dev, "failed to register spa range %d\n",
2441 nfit_spa->spa->range_index);
2442 return rc;
2443}
2444
2445static int ars_status_alloc(struct acpi_nfit_desc *acpi_desc,
2446 u32 max_ars)
2447{
2448 struct device *dev = acpi_desc->dev;
2449 struct nd_cmd_ars_status *ars_status;
2450
2451 if (acpi_desc->ars_status && acpi_desc->ars_status_size >= max_ars) {
2452 memset(acpi_desc->ars_status, 0, acpi_desc->ars_status_size);
2453 return 0;
2454 }
2455
2456 if (acpi_desc->ars_status)
2457 devm_kfree(dev, acpi_desc->ars_status);
2458 acpi_desc->ars_status = NULL;
2459 ars_status = devm_kzalloc(dev, max_ars, GFP_KERNEL);
2460 if (!ars_status)
2461 return -ENOMEM;
2462 acpi_desc->ars_status = ars_status;
2463 acpi_desc->ars_status_size = max_ars;
1f7df6f8
DW		 2464 return 0;
2465}
2466
1cf03c00
DW		 2467static int acpi_nfit_query_poison(struct acpi_nfit_desc *acpi_desc,
2468 struct nfit_spa *nfit_spa)
2469{
2470 struct acpi_nfit_system_address *spa = nfit_spa->spa;
2471 int rc;
2472
2473 if (!nfit_spa->max_ars) {
2474 struct nd_cmd_ars_cap ars_cap;
2475
2476 memset(&ars_cap, 0, sizeof(ars_cap));
2477 rc = ars_get_cap(acpi_desc, &ars_cap, nfit_spa);
2478 if (rc < 0)
2479 return rc;
2480 nfit_spa->max_ars = ars_cap.max_ars_out;
2481 nfit_spa->clear_err_unit = ars_cap.clear_err_unit;
2482 /* check that the supported scrub types match the spa type */
2483 if (nfit_spa_type(spa) == NFIT_SPA_VOLATILE &&
2484 ((ars_cap.status >> 16) & ND_ARS_VOLATILE) == 0)
2485 return -ENOTTY;
2486 else if (nfit_spa_type(spa) == NFIT_SPA_PM &&
2487 ((ars_cap.status >> 16) & ND_ARS_PERSISTENT) == 0)
2488 return -ENOTTY;
2489 }
2490
2491 if (ars_status_alloc(acpi_desc, nfit_spa->max_ars))
2492 return -ENOMEM;
2493
2494 rc = ars_get_status(acpi_desc);
2495 if (rc < 0 && rc != -ENOSPC)
2496 return rc;
2497
82aa37cf 2498 if (ars_status_process_records(acpi_desc, acpi_desc->ars_status))
1cf03c00
DW		 2499 return -ENOMEM;
2500
2501 return 0;
2502}
2503
2504static void acpi_nfit_async_scrub(struct acpi_nfit_desc *acpi_desc,
2505 struct nfit_spa *nfit_spa)
2506{
2507 struct acpi_nfit_system_address *spa = nfit_spa->spa;
2508 unsigned int overflow_retry = scrub_overflow_abort;
2509 u64 init_ars_start = 0, init_ars_len = 0;
2510 struct device *dev = acpi_desc->dev;
2511 unsigned int tmo = scrub_timeout;
2512 int rc;
2513
37b137ff 2514 if (!nfit_spa->ars_required || !nfit_spa->nd_region)
1cf03c00
DW		 2515 return;
2516
2517 rc = ars_start(acpi_desc, nfit_spa);
2518 /*
2519 * If we timed out the initial scan we'll still be busy here,
2520 * and will wait another timeout before giving up permanently.
2521 */
2522 if (rc < 0 && rc != -EBUSY)
2523 return;
2524
2525 do {
2526 u64 ars_start, ars_len;
2527
2528 if (acpi_desc->cancel)
2529 break;
2530 rc = acpi_nfit_query_poison(acpi_desc, nfit_spa);
2531 if (rc == -ENOTTY)
2532 break;
2533 if (rc == -EBUSY && !tmo) {
2534 dev_warn(dev, "range %d ars timeout, aborting\n",
2535 spa->range_index);
2536 break;
2537 }
2538
2539 if (rc == -EBUSY) {
2540 /*
2541 * Note, entries may be appended to the list
2542 * while the lock is dropped, but the workqueue
2543 * being active prevents entries being deleted /
2544 * freed.
2545 */
2546 mutex_unlock(&acpi_desc->init_mutex);
2547 ssleep(1);
2548 tmo--;
2549 mutex_lock(&acpi_desc->init_mutex);
2550 continue;
2551 }
2552
2553 /* we got some results, but there are more pending... */
2554 if (rc == -ENOSPC && overflow_retry--) {
2555 if (!init_ars_len) {
2556 init_ars_len = acpi_desc->ars_status->length;
2557 init_ars_start = acpi_desc->ars_status->address;
2558 }
2559 rc = ars_continue(acpi_desc);
2560 }
2561
2562 if (rc < 0) {
2563 dev_warn(dev, "range %d ars continuation failed\n",
2564 spa->range_index);
2565 break;
2566 }
2567
2568 if (init_ars_len) {
2569 ars_start = init_ars_start;
2570 ars_len = init_ars_len;
2571 } else {
2572 ars_start = acpi_desc->ars_status->address;
2573 ars_len = acpi_desc->ars_status->length;
2574 }
2575 dev_dbg(dev, "spa range: %d ars from %#llx + %#llx complete\n",
2576 spa->range_index, ars_start, ars_len);
2577 /* notify the region about new poison entries */
2578 nvdimm_region_notify(nfit_spa->nd_region,
2579 NVDIMM_REVALIDATE_POISON);
2580 break;
2581 } while (1);
2582}
2583
2584static void acpi_nfit_scrub(struct work_struct *work)
1f7df6f8 2585{
1cf03c00
DW		 2586 struct device *dev;
2587 u64 init_scrub_length = 0;
1f7df6f8 2588 struct nfit_spa *nfit_spa;
1cf03c00
DW		 2589 u64 init_scrub_address = 0;
2590 bool init_ars_done = false;
2591 struct acpi_nfit_desc *acpi_desc;
2592 unsigned int tmo = scrub_timeout;
2593 unsigned int overflow_retry = scrub_overflow_abort;
2594
2595 acpi_desc = container_of(work, typeof(*acpi_desc), work);
2596 dev = acpi_desc->dev;
1f7df6f8 2597
1cf03c00
DW		 2598 /*
2599 * We scrub in 2 phases. The first phase waits for any platform
2600 * firmware initiated scrubs to complete and then we go search for the
2601 * affected spa regions to mark them scanned. In the second phase we
2602 * initiate a directed scrub for every range that was not scrubbed in
37b137ff
VV		 2603 * phase 1. If we're called for a 'rescan', we harmlessly pass through
2604 * the first phase, but really only care about running phase 2, where
2605 * regions can be notified of new poison.
1cf03c00
DW		 2606 */
2607
2608 /* process platform firmware initiated scrubs */
2609 retry:
2610 mutex_lock(&acpi_desc->init_mutex);
1f7df6f8 2611 list_for_each_entry(nfit_spa, &acpi_desc->spas, list) {
1cf03c00
DW		 2612 struct nd_cmd_ars_status *ars_status;
2613 struct acpi_nfit_system_address *spa;
2614 u64 ars_start, ars_len;
2615 int rc;
1f7df6f8 2616
1cf03c00
DW		 2617 if (acpi_desc->cancel)
2618 break;
2619
2620 if (nfit_spa->nd_region)
2621 continue;
2622
2623 if (init_ars_done) {
2624 /*
2625 * No need to re-query, we're now just
2626 * reconciling all the ranges covered by the
2627 * initial scrub
2628 */
2629 rc = 0;
2630 } else
2631 rc = acpi_nfit_query_poison(acpi_desc, nfit_spa);
2632
2633 if (rc == -ENOTTY) {
2634 /* no ars capability, just register spa and move on */
2635 acpi_nfit_register_region(acpi_desc, nfit_spa);
2636 continue;
2637 }
2638
2639 if (rc == -EBUSY && !tmo) {
2640 /* fallthrough to directed scrub in phase 2 */
2641 dev_warn(dev, "timeout awaiting ars results, continuing...\n");
2642 break;
2643 } else if (rc == -EBUSY) {
2644 mutex_unlock(&acpi_desc->init_mutex);
2645 ssleep(1);
2646 tmo--;
2647 goto retry;
2648 }
2649
2650 /* we got some results, but there are more pending... */
2651 if (rc == -ENOSPC && overflow_retry--) {
2652 ars_status = acpi_desc->ars_status;
2653 /*
2654 * Record the original scrub range, so that we
2655 * can recall all the ranges impacted by the
2656 * initial scrub.
2657 */
2658 if (!init_scrub_length) {
2659 init_scrub_length = ars_status->length;
2660 init_scrub_address = ars_status->address;
2661 }
2662 rc = ars_continue(acpi_desc);
2663 if (rc == 0) {
2664 mutex_unlock(&acpi_desc->init_mutex);
2665 goto retry;
2666 }
2667 }
2668
2669 if (rc < 0) {
2670 /*
2671 * Initial scrub failed, we'll give it one more
2672 * try below...
2673 */
2674 break;
2675 }
2676
2677 /* We got some final results, record completed ranges */
2678 ars_status = acpi_desc->ars_status;
2679 if (init_scrub_length) {
2680 ars_start = init_scrub_address;
2681 ars_len = ars_start + init_scrub_length;
2682 } else {
2683 ars_start = ars_status->address;
2684 ars_len = ars_status->length;
2685 }
2686 spa = nfit_spa->spa;
2687
2688 if (!init_ars_done) {
2689 init_ars_done = true;
2690 dev_dbg(dev, "init scrub %#llx + %#llx complete\n",
2691 ars_start, ars_len);
2692 }
2693 if (ars_start <= spa->address && ars_start + ars_len
2694 >= spa->address + spa->length)
2695 acpi_nfit_register_region(acpi_desc, nfit_spa);
1f7df6f8 2696 }
1cf03c00
DW		 2697
2698 /*
2699 * For all the ranges not covered by an initial scrub we still
2700 * want to see if there are errors, but it's ok to discover them
2701 * asynchronously.
2702 */
2703 list_for_each_entry(nfit_spa, &acpi_desc->spas, list) {
2704 /*
2705 * Flag all the ranges that still need scrubbing, but
2706 * register them now to make data available.
2707 */
37b137ff
VV		 2708 if (!nfit_spa->nd_region) {
2709 nfit_spa->ars_required = 1;
1cf03c00 2710 acpi_nfit_register_region(acpi_desc, nfit_spa);
37b137ff 2711 }
1cf03c00 2712 }
9ccaed4b 2713 acpi_desc->init_complete = 1;
1cf03c00
DW		 2714
2715 list_for_each_entry(nfit_spa, &acpi_desc->spas, list)
2716 acpi_nfit_async_scrub(acpi_desc, nfit_spa);
37b137ff 2717 acpi_desc->scrub_count++;
80790039 2718 acpi_desc->ars_start_flags = 0;
37b137ff
VV		 2719 if (acpi_desc->scrub_count_state)
2720 sysfs_notify_dirent(acpi_desc->scrub_count_state);
1cf03c00
DW		 2721 mutex_unlock(&acpi_desc->init_mutex);
2722}
2723
2724static int acpi_nfit_register_regions(struct acpi_nfit_desc *acpi_desc)
2725{
2726 struct nfit_spa *nfit_spa;
2727 int rc;
2728
2729 list_for_each_entry(nfit_spa, &acpi_desc->spas, list)
2730 if (nfit_spa_type(nfit_spa->spa) == NFIT_SPA_DCR) {
2731 /* BLK regions don't need to wait for ars results */
2732 rc = acpi_nfit_register_region(acpi_desc, nfit_spa);
2733 if (rc)
2734 return rc;
2735 }
2736
80790039 2737 acpi_desc->ars_start_flags = 0;
fbabd829
DW		 2738 if (!acpi_desc->cancel)
2739 queue_work(nfit_wq, &acpi_desc->work);
1f7df6f8
DW		 2740 return 0;
2741}
2742
20985164
VV		 2743static int acpi_nfit_check_deletions(struct acpi_nfit_desc *acpi_desc,
2744 struct nfit_table_prev *prev)
2745{
2746 struct device *dev = acpi_desc->dev;
2747
2748 if (!list_empty(&prev->spas) ||
2749 !list_empty(&prev->memdevs) ||
2750 !list_empty(&prev->dcrs) ||
2751 !list_empty(&prev->bdws) ||
2752 !list_empty(&prev->idts) ||
2753 !list_empty(&prev->flushes)) {
2754 dev_err(dev, "new nfit deletes entries (unsupported)\n");
2755 return -ENXIO;
2756 }
2757 return 0;
2758}
2759
37b137ff
VV		 2760static int acpi_nfit_desc_init_scrub_attr(struct acpi_nfit_desc *acpi_desc)
2761{
2762 struct device *dev = acpi_desc->dev;
2763 struct kernfs_node *nfit;
2764 struct device *bus_dev;
2765
2766 if (!ars_supported(acpi_desc->nvdimm_bus))
2767 return 0;
2768
2769 bus_dev = to_nvdimm_bus_dev(acpi_desc->nvdimm_bus);
2770 nfit = sysfs_get_dirent(bus_dev->kobj.sd, "nfit");
2771 if (!nfit) {
2772 dev_err(dev, "sysfs_get_dirent 'nfit' failed\n");
2773 return -ENODEV;
2774 }
2775 acpi_desc->scrub_count_state = sysfs_get_dirent(nfit, "scrub");
2776 sysfs_put(nfit);
2777 if (!acpi_desc->scrub_count_state) {
2778 dev_err(dev, "sysfs_get_dirent 'scrub' failed\n");
2779 return -ENODEV;
2780 }
2781
2782 return 0;
2783}
2784
fbabd829 2785static void acpi_nfit_unregister(void *data)
58cd71b4
DW		 2786{
2787 struct acpi_nfit_desc *acpi_desc = data;
2788
58cd71b4 2789 nvdimm_bus_unregister(acpi_desc->nvdimm_bus);
58cd71b4
DW		 2790}
2791
e7a11b44 2792int acpi_nfit_init(struct acpi_nfit_desc *acpi_desc, void *data, acpi_size sz)
b94d5230
DW		 2793{
2794 struct device *dev = acpi_desc->dev;
20985164 2795 struct nfit_table_prev prev;
b94d5230 2796 const void *end;
1f7df6f8 2797 int rc;
b94d5230 2798
58cd71b4 2799 if (!acpi_desc->nvdimm_bus) {
37b137ff
VV		 2800 acpi_nfit_init_dsms(acpi_desc);
2801
58cd71b4
DW		 2802 acpi_desc->nvdimm_bus = nvdimm_bus_register(dev,
2803 &acpi_desc->nd_desc);
2804 if (!acpi_desc->nvdimm_bus)
2805 return -ENOMEM;
37b137ff 2806
fbabd829 2807 rc = devm_add_action_or_reset(dev, acpi_nfit_unregister,
58cd71b4
DW		 2808 acpi_desc);
2809 if (rc)
2810 return rc;
37b137ff
VV		 2811
2812 rc = acpi_nfit_desc_init_scrub_attr(acpi_desc);
2813 if (rc)
2814 return rc;
6839a6d9
VV		 2815
2816 /* register this acpi_desc for mce notifications */
2817 mutex_lock(&acpi_desc_lock);
2818 list_add_tail(&acpi_desc->list, &acpi_descs);
2819 mutex_unlock(&acpi_desc_lock);
58cd71b4
DW		 2820 }
2821
20985164
VV		 2822 mutex_lock(&acpi_desc->init_mutex);
2823
2824 INIT_LIST_HEAD(&prev.spas);
2825 INIT_LIST_HEAD(&prev.memdevs);
2826 INIT_LIST_HEAD(&prev.dcrs);
2827 INIT_LIST_HEAD(&prev.bdws);
2828 INIT_LIST_HEAD(&prev.idts);
2829 INIT_LIST_HEAD(&prev.flushes);
2830
2831 list_cut_position(&prev.spas, &acpi_desc->spas,
2832 acpi_desc->spas.prev);
2833 list_cut_position(&prev.memdevs, &acpi_desc->memdevs,
2834 acpi_desc->memdevs.prev);
2835 list_cut_position(&prev.dcrs, &acpi_desc->dcrs,
2836 acpi_desc->dcrs.prev);
2837 list_cut_position(&prev.bdws, &acpi_desc->bdws,
2838 acpi_desc->bdws.prev);
2839 list_cut_position(&prev.idts, &acpi_desc->idts,
2840 acpi_desc->idts.prev);
2841 list_cut_position(&prev.flushes, &acpi_desc->flushes,
2842 acpi_desc->flushes.prev);
b94d5230 2843
b94d5230 2844 end = data + sz;
b94d5230 2845 while (!IS_ERR_OR_NULL(data))
20985164 2846 data = add_table(acpi_desc, &prev, data, end);
b94d5230
DW		 2847
2848 if (IS_ERR(data)) {
2849 dev_dbg(dev, "%s: nfit table parsing error: %ld\n", __func__,
2850 PTR_ERR(data));
20985164
VV		 2851 rc = PTR_ERR(data);
2852 goto out_unlock;
b94d5230
DW		 2853 }
2854
20985164
VV		 2855 rc = acpi_nfit_check_deletions(acpi_desc, &prev);
2856 if (rc)
2857 goto out_unlock;
2858
81ed4e36
DW		 2859 rc = nfit_mem_init(acpi_desc);
2860 if (rc)
20985164 2861 goto out_unlock;
62232e45 2862
1f7df6f8
DW		 2863 rc = acpi_nfit_register_dimms(acpi_desc);
2864 if (rc)
20985164
VV		 2865 goto out_unlock;
2866
2867 rc = acpi_nfit_register_regions(acpi_desc);
1f7df6f8 2868
20985164
VV		 2869 out_unlock:
2870 mutex_unlock(&acpi_desc->init_mutex);
2871 return rc;
b94d5230 2872}
6bc75619 2873EXPORT_SYMBOL_GPL(acpi_nfit_init);
b94d5230 2874
7ae0fa43
DW		 2875struct acpi_nfit_flush_work {
2876 struct work_struct work;
2877 struct completion cmp;
2878};
2879
2880static void flush_probe(struct work_struct *work)
2881{
2882 struct acpi_nfit_flush_work *flush;
2883
2884 flush = container_of(work, typeof(*flush), work);
2885 complete(&flush->cmp);
2886}
2887
2888static int acpi_nfit_flush_probe(struct nvdimm_bus_descriptor *nd_desc)
2889{
2890 struct acpi_nfit_desc *acpi_desc = to_acpi_nfit_desc(nd_desc);
2891 struct device *dev = acpi_desc->dev;
2892 struct acpi_nfit_flush_work flush;
e471486c 2893 int rc;
7ae0fa43
DW		 2894
2895 /* bounce the device lock to flush acpi_nfit_add / acpi_nfit_notify */
2896 device_lock(dev);
2897 device_unlock(dev);
2898
9ccaed4b
DW		 2899 /* bounce the init_mutex to make init_complete valid */
2900 mutex_lock(&acpi_desc->init_mutex);
fbabd829
DW		 2901 if (acpi_desc->cancel || acpi_desc->init_complete) {
2902 mutex_unlock(&acpi_desc->init_mutex);
9ccaed4b 2903 return 0;
fbabd829 2904 }
9ccaed4b 2905
7ae0fa43
DW		 2906 /*
2907 * Scrub work could take 10s of seconds, userspace may give up so we
2908 * need to be interruptible while waiting.
2909 */
2910 INIT_WORK_ONSTACK(&flush.work, flush_probe);
2911 COMPLETION_INITIALIZER_ONSTACK(flush.cmp);
2912 queue_work(nfit_wq, &flush.work);
fbabd829 2913 mutex_unlock(&acpi_desc->init_mutex);
e471486c
DW		 2914
2915 rc = wait_for_completion_interruptible(&flush.cmp);
2916 cancel_work_sync(&flush.work);
2917 return rc;
7ae0fa43
DW		 2918}
2919
87bf572e
DW		 2920static int acpi_nfit_clear_to_send(struct nvdimm_bus_descriptor *nd_desc,
2921 struct nvdimm *nvdimm, unsigned int cmd)
2922{
2923 struct acpi_nfit_desc *acpi_desc = to_acpi_nfit_desc(nd_desc);
2924
2925 if (nvdimm)
2926 return 0;
2927 if (cmd != ND_CMD_ARS_START)
2928 return 0;
2929
2930 /*
2931 * The kernel and userspace may race to initiate a scrub, but
2932 * the scrub thread is prepared to lose that initial race. It
2933 * just needs guarantees that any ars it initiates are not
2934 * interrupted by any intervening start reqeusts from userspace.
2935 */
2936 if (work_busy(&acpi_desc->work))
2937 return -EBUSY;
2938
2939 return 0;
2940}
2941
80790039 2942int acpi_nfit_ars_rescan(struct acpi_nfit_desc *acpi_desc, u8 flags)
37b137ff
VV		 2943{
2944 struct device *dev = acpi_desc->dev;
2945 struct nfit_spa *nfit_spa;
2946
2947 if (work_busy(&acpi_desc->work))
2948 return -EBUSY;
2949
fbabd829
DW		 2950 mutex_lock(&acpi_desc->init_mutex);
2951 if (acpi_desc->cancel) {
2952 mutex_unlock(&acpi_desc->init_mutex);
37b137ff 2953 return 0;
fbabd829 2954 }
37b137ff 2955
37b137ff
VV		 2956 list_for_each_entry(nfit_spa, &acpi_desc->spas, list) {
2957 struct acpi_nfit_system_address *spa = nfit_spa->spa;
2958
2959 if (nfit_spa_type(spa) != NFIT_SPA_PM)
2960 continue;
2961
2962 nfit_spa->ars_required = 1;
2963 }
80790039 2964 acpi_desc->ars_start_flags = flags;
37b137ff
VV		 2965 queue_work(nfit_wq, &acpi_desc->work);
2966 dev_dbg(dev, "%s: ars_scan triggered\n", __func__);
2967 mutex_unlock(&acpi_desc->init_mutex);
2968
2969 return 0;
2970}
2971
a61fe6f7 2972void acpi_nfit_desc_init(struct acpi_nfit_desc *acpi_desc, struct device *dev)
b94d5230
DW		 2973{
2974 struct nvdimm_bus_descriptor *nd_desc;
b94d5230
DW		 2975
2976 dev_set_drvdata(dev, acpi_desc);
2977 acpi_desc->dev = dev;
6bc75619 2978 acpi_desc->blk_do_io = acpi_nfit_blk_region_do_io;
b94d5230
DW		 2979 nd_desc = &acpi_desc->nd_desc;
2980 nd_desc->provider_name = "ACPI.NFIT";
bc9775d8 2981 nd_desc->module = THIS_MODULE;
b94d5230 2982 nd_desc->ndctl = acpi_nfit_ctl;
7ae0fa43 2983 nd_desc->flush_probe = acpi_nfit_flush_probe;
87bf572e 2984 nd_desc->clear_to_send = acpi_nfit_clear_to_send;
45def22c 2985 nd_desc->attr_groups = acpi_nfit_attribute_groups;
b94d5230 2986
20985164
VV		 2987 INIT_LIST_HEAD(&acpi_desc->spas);
2988 INIT_LIST_HEAD(&acpi_desc->dcrs);
2989 INIT_LIST_HEAD(&acpi_desc->bdws);
2990 INIT_LIST_HEAD(&acpi_desc->idts);
2991 INIT_LIST_HEAD(&acpi_desc->flushes);
2992 INIT_LIST_HEAD(&acpi_desc->memdevs);
2993 INIT_LIST_HEAD(&acpi_desc->dimms);
6839a6d9 2994 INIT_LIST_HEAD(&acpi_desc->list);
20985164 2995 mutex_init(&acpi_desc->init_mutex);
1cf03c00 2996 INIT_WORK(&acpi_desc->work, acpi_nfit_scrub);
20985164 2997}
a61fe6f7 2998EXPORT_SYMBOL_GPL(acpi_nfit_desc_init);
20985164 2999
3c87f372
DW		 3000static void acpi_nfit_put_table(void *table)
3001{
3002 acpi_put_table(table);
3003}
3004
fbabd829
DW		 3005void acpi_nfit_shutdown(void *data)
3006{
3007 struct acpi_nfit_desc *acpi_desc = data;
3008 struct device *bus_dev = to_nvdimm_bus_dev(acpi_desc->nvdimm_bus);
3009
3010 /*
3011 * Destruct under acpi_desc_lock so that nfit_handle_mce does not
3012 * race teardown
3013 */
3014 mutex_lock(&acpi_desc_lock);
3015 list_del(&acpi_desc->list);
3016 mutex_unlock(&acpi_desc_lock);
3017
3018 mutex_lock(&acpi_desc->init_mutex);
3019 acpi_desc->cancel = 1;
3020 mutex_unlock(&acpi_desc->init_mutex);
3021
3022 /*
3023 * Bounce the nvdimm bus lock to make sure any in-flight
3024 * acpi_nfit_ars_rescan() submissions have had a chance to
3025 * either submit or see ->cancel set.
3026 */
3027 device_lock(bus_dev);
3028 device_unlock(bus_dev);
3029
3030 flush_workqueue(nfit_wq);
3031}
3032EXPORT_SYMBOL_GPL(acpi_nfit_shutdown);
3033
20985164
VV		 3034static int acpi_nfit_add(struct acpi_device *adev)
3035{
3036 struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL };
3037 struct acpi_nfit_desc *acpi_desc;
3038 struct device *dev = &adev->dev;
3039 struct acpi_table_header *tbl;
3040 acpi_status status = AE_OK;
3041 acpi_size sz;
31932041 3042 int rc = 0;
20985164 3043
6b11d1d6 3044 status = acpi_get_table(ACPI_SIG_NFIT, 0, &tbl);
20985164
VV		 3045 if (ACPI_FAILURE(status)) {
3046 /* This is ok, we could have an nvdimm hotplugged later */
3047 dev_dbg(dev, "failed to find NFIT at startup\n");
3048 return 0;
3049 }
3c87f372
DW		 3050
3051 rc = devm_add_action_or_reset(dev, acpi_nfit_put_table, tbl);
3052 if (rc)
3053 return rc;
6b11d1d6 3054 sz = tbl->length;
20985164 3055
a61fe6f7
DW		 3056 acpi_desc = devm_kzalloc(dev, sizeof(*acpi_desc), GFP_KERNEL);
3057 if (!acpi_desc)
3058 return -ENOMEM;
3059 acpi_nfit_desc_init(acpi_desc, &adev->dev);
20985164 3060
e7a11b44 3061 /* Save the acpi header for exporting the revision via sysfs */
6b577c9d 3062 acpi_desc->acpi_header = *tbl;
20985164
VV		 3063
3064 /* Evaluate _FIT and override with that if present */
3065 status = acpi_evaluate_object(adev->handle, "_FIT", NULL, &buf);
3066 if (ACPI_SUCCESS(status) && buf.length > 0) {
e7a11b44
DW		 3067 union acpi_object *obj = buf.pointer;
3068
3069 if (obj->type == ACPI_TYPE_BUFFER)
3070 rc = acpi_nfit_init(acpi_desc, obj->buffer.pointer,
3071 obj->buffer.length);
3072 else
6b577c9d
LK		 3073 dev_dbg(dev, "%s invalid type %d, ignoring _FIT\n",
3074 __func__, (int) obj->type);
31932041
DW		 3075 kfree(buf.pointer);
3076 } else
e7a11b44
DW		 3077 /* skip over the lead-in header table */
3078 rc = acpi_nfit_init(acpi_desc, (void *) tbl
3079 + sizeof(struct acpi_table_nfit),
3080 sz - sizeof(struct acpi_table_nfit));
fbabd829
DW		 3081
3082 if (rc)
3083 return rc;
3084 return devm_add_action_or_reset(dev, acpi_nfit_shutdown, acpi_desc);
b94d5230
DW		 3085}
3086
3087static int acpi_nfit_remove(struct acpi_device *adev)
3088{
fbabd829 3089 /* see acpi_nfit_unregister */
b94d5230
DW		 3090 return 0;
3091}
3092
56b47fe6 3093static void acpi_nfit_update_notify(struct device *dev, acpi_handle handle)
20985164 3094{
c14a868a 3095 struct acpi_nfit_desc *acpi_desc = dev_get_drvdata(dev);
20985164 3096 struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL };
e7a11b44 3097 union acpi_object *obj;
20985164
VV		 3098 acpi_status status;
3099 int ret;
3100
20985164
VV		 3101 if (!dev->driver) {
3102 /* dev->driver may be null if we're being removed */
3103 dev_dbg(dev, "%s: no driver found for dev\n", __func__);
c14a868a 3104 return;
20985164
VV		 3105 }
3106
3107 if (!acpi_desc) {
a61fe6f7
DW		 3108 acpi_desc = devm_kzalloc(dev, sizeof(*acpi_desc), GFP_KERNEL);
3109 if (!acpi_desc)
c14a868a
DW		 3110 return;
3111 acpi_nfit_desc_init(acpi_desc, dev);
7ae0fa43
DW		 3112 } else {
3113 /*
3114 * Finish previous registration before considering new
3115 * regions.
3116 */
3117 flush_workqueue(nfit_wq);
20985164
VV		 3118 }
3119
3120 /* Evaluate _FIT */
c14a868a 3121 status = acpi_evaluate_object(handle, "_FIT", NULL, &buf);
20985164
VV		 3122 if (ACPI_FAILURE(status)) {
3123 dev_err(dev, "failed to evaluate _FIT\n");
c14a868a 3124 return;
20985164
VV		 3125 }
3126
6b577c9d
LK		 3127 obj = buf.pointer;
3128 if (obj->type == ACPI_TYPE_BUFFER) {
e7a11b44
DW		 3129 ret = acpi_nfit_init(acpi_desc, obj->buffer.pointer,
3130 obj->buffer.length);
31932041 3131 if (ret)
6b577c9d 3132 dev_err(dev, "failed to merge updated NFIT\n");
31932041 3133 } else
6b577c9d 3134 dev_err(dev, "Invalid _FIT\n");
20985164 3135 kfree(buf.pointer);
c14a868a 3136}
56b47fe6
TK		 3137
3138static void acpi_nfit_uc_error_notify(struct device *dev, acpi_handle handle)
3139{
3140 struct acpi_nfit_desc *acpi_desc = dev_get_drvdata(dev);
80790039
TK		 3141 u8 flags = (acpi_desc->scrub_mode == HW_ERROR_SCRUB_ON) ?
3142 0 : ND_ARS_RETURN_PREV_DATA;
56b47fe6 3143
80790039 3144 acpi_nfit_ars_rescan(acpi_desc, flags);
56b47fe6
TK		 3145}
3146
3147void __acpi_nfit_notify(struct device *dev, acpi_handle handle, u32 event)
3148{
3149 dev_dbg(dev, "%s: event: 0x%x\n", __func__, event);
3150
3151 switch (event) {
3152 case NFIT_NOTIFY_UPDATE:
3153 return acpi_nfit_update_notify(dev, handle);
3154 case NFIT_NOTIFY_UC_MEMORY_ERROR:
3155 return acpi_nfit_uc_error_notify(dev, handle);
3156 default:
3157 return;
3158 }
3159}
c14a868a 3160EXPORT_SYMBOL_GPL(__acpi_nfit_notify);
20985164 3161
c14a868a
DW		 3162static void acpi_nfit_notify(struct acpi_device *adev, u32 event)
3163{
3164 device_lock(&adev->dev);
3165 __acpi_nfit_notify(&adev->dev, adev->handle, event);
3166 device_unlock(&adev->dev);
20985164
VV		 3167}
3168
b94d5230
DW		 3169static const struct acpi_device_id acpi_nfit_ids[] = {
3170 { "ACPI0012", 0 },
3171 { "", 0 },
3172};
3173MODULE_DEVICE_TABLE(acpi, acpi_nfit_ids);
3174
3175static struct acpi_driver acpi_nfit_driver = {
3176 .name = KBUILD_MODNAME,
3177 .ids = acpi_nfit_ids,
3178 .ops = {
3179 .add = acpi_nfit_add,
3180 .remove = acpi_nfit_remove,
20985164 3181 .notify = acpi_nfit_notify,
b94d5230
DW		 3182 },
3183};
3184
3185static __init int nfit_init(void)
3186{
7e700d2c
PB		 3187 int ret;
3188
b94d5230
DW		 3189 BUILD_BUG_ON(sizeof(struct acpi_table_nfit) != 40);
3190 BUILD_BUG_ON(sizeof(struct acpi_nfit_system_address) != 56);
3191 BUILD_BUG_ON(sizeof(struct acpi_nfit_memory_map) != 48);
3192 BUILD_BUG_ON(sizeof(struct acpi_nfit_interleave) != 20);
3193 BUILD_BUG_ON(sizeof(struct acpi_nfit_smbios) != 9);
3194 BUILD_BUG_ON(sizeof(struct acpi_nfit_control_region) != 80);
3195 BUILD_BUG_ON(sizeof(struct acpi_nfit_data_region) != 40);
3196
41c8bdb3
AS		 3197 guid_parse(UUID_VOLATILE_MEMORY, &nfit_uuid[NFIT_SPA_VOLATILE]);
3198 guid_parse(UUID_PERSISTENT_MEMORY, &nfit_uuid[NFIT_SPA_PM]);
3199 guid_parse(UUID_CONTROL_REGION, &nfit_uuid[NFIT_SPA_DCR]);
3200 guid_parse(UUID_DATA_REGION, &nfit_uuid[NFIT_SPA_BDW]);
3201 guid_parse(UUID_VOLATILE_VIRTUAL_DISK, &nfit_uuid[NFIT_SPA_VDISK]);
3202 guid_parse(UUID_VOLATILE_VIRTUAL_CD, &nfit_uuid[NFIT_SPA_VCD]);
3203 guid_parse(UUID_PERSISTENT_VIRTUAL_DISK, &nfit_uuid[NFIT_SPA_PDISK]);
3204 guid_parse(UUID_PERSISTENT_VIRTUAL_CD, &nfit_uuid[NFIT_SPA_PCD]);
3205 guid_parse(UUID_NFIT_BUS, &nfit_uuid[NFIT_DEV_BUS]);
3206 guid_parse(UUID_NFIT_DIMM, &nfit_uuid[NFIT_DEV_DIMM]);
3207 guid_parse(UUID_NFIT_DIMM_N_HPE1, &nfit_uuid[NFIT_DEV_DIMM_N_HPE1]);
3208 guid_parse(UUID_NFIT_DIMM_N_HPE2, &nfit_uuid[NFIT_DEV_DIMM_N_HPE2]);
3209 guid_parse(UUID_NFIT_DIMM_N_MSFT, &nfit_uuid[NFIT_DEV_DIMM_N_MSFT]);
b94d5230 3210
7ae0fa43
DW		 3211 nfit_wq = create_singlethread_workqueue("nfit");
3212 if (!nfit_wq)
3213 return -ENOMEM;
3214
6839a6d9 3215 nfit_mce_register();
7e700d2c
PB		 3216 ret = acpi_bus_register_driver(&acpi_nfit_driver);
3217 if (ret) {
3218 nfit_mce_unregister();
3219 destroy_workqueue(nfit_wq);
3220 }
3221
3222 return ret;
6839a6d9 3223
b94d5230
DW		 3224}
3225
3226static __exit void nfit_exit(void)
3227{
6839a6d9 3228 nfit_mce_unregister();
b94d5230 3229 acpi_bus_unregister_driver(&acpi_nfit_driver);
7ae0fa43 3230 destroy_workqueue(nfit_wq);
6839a6d9 3231 WARN_ON(!list_empty(&acpi_descs));
b94d5230
DW		 3232}
3233
3234module_init(nfit_init);
3235module_exit(nfit_exit);
3236MODULE_LICENSE("GPL v2");
3237MODULE_AUTHOR("Intel Corporation");
Ubuntu Focal Linux kernel mirror