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Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
[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;
9edcad53
MX		 231
232 for (i = 0; i < ARRAY_SIZE(call_pkg->nd_reserved2); i++)
233 if (call_pkg->nd_reserved2[i])
234 return -EINVAL;
31eca76b
DW		 235 }
236
62232e45
DW		 237 if (nvdimm) {
238 struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
239 struct acpi_device *adev = nfit_mem->adev;
240
241 if (!adev)
242 return -ENOTTY;
31eca76b
DW		 243 if (call_pkg && nfit_mem->family != call_pkg->nd_family)
244 return -ENOTTY;
245
047fc8a1 246 dimm_name = nvdimm_name(nvdimm);
62232e45 247 cmd_name = nvdimm_cmd_name(cmd);
e3654eca 248 cmd_mask = nvdimm_cmd_mask(nvdimm);
62232e45
DW		 249 dsm_mask = nfit_mem->dsm_mask;
250 desc = nd_cmd_dimm_desc(cmd);
41c8bdb3 251 guid = to_nfit_uuid(nfit_mem->family);
62232e45
DW		 252 handle = adev->handle;
253 } else {
254 struct acpi_device *adev = to_acpi_dev(acpi_desc);
255
256 cmd_name = nvdimm_bus_cmd_name(cmd);
e3654eca 257 cmd_mask = nd_desc->cmd_mask;
31eca76b 258 dsm_mask = cmd_mask;
7db5bb33
JH		 259 if (cmd == ND_CMD_CALL)
260 dsm_mask = nd_desc->bus_dsm_mask;
62232e45 261 desc = nd_cmd_bus_desc(cmd);
41c8bdb3 262 guid = to_nfit_uuid(NFIT_DEV_BUS);
62232e45
DW		 263 handle = adev->handle;
264 dimm_name = "bus";
265 }
266
267 if (!desc || (cmd && (desc->out_num + desc->in_num == 0)))
268 return -ENOTTY;
269
31eca76b 270 if (!test_bit(cmd, &cmd_mask) || !test_bit(func, &dsm_mask))
62232e45
DW		 271 return -ENOTTY;
272
273 in_obj.type = ACPI_TYPE_PACKAGE;
274 in_obj.package.count = 1;
275 in_obj.package.elements = &in_buf;
276 in_buf.type = ACPI_TYPE_BUFFER;
277 in_buf.buffer.pointer = buf;
278 in_buf.buffer.length = 0;
279
280 /* libnvdimm has already validated the input envelope */
281 for (i = 0; i < desc->in_num; i++)
282 in_buf.buffer.length += nd_cmd_in_size(nvdimm, cmd, desc,
283 i, buf);
284
31eca76b
DW		 285 if (call_pkg) {
286 /* skip over package wrapper */
287 in_buf.buffer.pointer = (void *) &call_pkg->nd_payload;
288 in_buf.buffer.length = call_pkg->nd_size_in;
289 }
290
7699a6a3
DW		 291 dev_dbg(dev, "%s:%s cmd: %d: func: %d input length: %d\n",
292 __func__, dimm_name, cmd, func, in_buf.buffer.length);
293 print_hex_dump_debug("nvdimm in ", DUMP_PREFIX_OFFSET, 4, 4,
31eca76b
DW		 294 in_buf.buffer.pointer,
295 min_t(u32, 256, in_buf.buffer.length), true);
62232e45 296
94116f81 297 out_obj = acpi_evaluate_dsm(handle, guid, 1, func, &in_obj);
62232e45
DW		 298 if (!out_obj) {
299 dev_dbg(dev, "%s:%s _DSM failed cmd: %s\n", __func__, dimm_name,
300 cmd_name);
301 return -EINVAL;
302 }
303
31eca76b
DW		 304 if (call_pkg) {
305 call_pkg->nd_fw_size = out_obj->buffer.length;
306 memcpy(call_pkg->nd_payload + call_pkg->nd_size_in,
307 out_obj->buffer.pointer,
308 min(call_pkg->nd_fw_size, call_pkg->nd_size_out));
309
310 ACPI_FREE(out_obj);
311 /*
312 * Need to support FW function w/o known size in advance.
313 * Caller can determine required size based upon nd_fw_size.
314 * If we return an error (like elsewhere) then caller wouldn't
315 * be able to rely upon data returned to make calculation.
316 */
317 return 0;
318 }
319
62232e45
DW		 320 if (out_obj->package.type != ACPI_TYPE_BUFFER) {
321 dev_dbg(dev, "%s:%s unexpected output object type cmd: %s type: %d\n",
322 __func__, dimm_name, cmd_name, out_obj->type);
323 rc = -EINVAL;
324 goto out;
325 }
326
7699a6a3
DW		 327 dev_dbg(dev, "%s:%s cmd: %s output length: %d\n", __func__, dimm_name,
328 cmd_name, out_obj->buffer.length);
329 print_hex_dump_debug(cmd_name, DUMP_PREFIX_OFFSET, 4, 4,
330 out_obj->buffer.pointer,
331 min_t(u32, 128, out_obj->buffer.length), true);
62232e45
DW		 332
333 for (i = 0, offset = 0; i < desc->out_num; i++) {
334 u32 out_size = nd_cmd_out_size(nvdimm, cmd, desc, i, buf,
efda1b5d
DW		 335 (u32 *) out_obj->buffer.pointer,
336 out_obj->buffer.length - offset);
62232e45
DW		 337
338 if (offset + out_size > out_obj->buffer.length) {
339 dev_dbg(dev, "%s:%s output object underflow cmd: %s field: %d\n",
340 __func__, dimm_name, cmd_name, i);
341 break;
342 }
343
344 if (in_buf.buffer.length + offset + out_size > buf_len) {
345 dev_dbg(dev, "%s:%s output overrun cmd: %s field: %d\n",
346 __func__, dimm_name, cmd_name, i);
347 rc = -ENXIO;
348 goto out;
349 }
350 memcpy(buf + in_buf.buffer.length + offset,
351 out_obj->buffer.pointer + offset, out_size);
352 offset += out_size;
353 }
11294d63
DW		 354
355 /*
356 * Set fw_status for all the commands with a known format to be
357 * later interpreted by xlat_status().
358 */
359 if (i >= 1 && ((cmd >= ND_CMD_ARS_CAP && cmd <= ND_CMD_CLEAR_ERROR)
360 || (cmd >= ND_CMD_SMART && cmd <= ND_CMD_VENDOR)))
361 fw_status = *(u32 *) out_obj->buffer.pointer;
362
62232e45
DW		 363 if (offset + in_buf.buffer.length < buf_len) {
364 if (i >= 1) {
365 /*
366 * status valid, return the number of bytes left
367 * unfilled in the output buffer
368 */
369 rc = buf_len - offset - in_buf.buffer.length;
aef25338 370 if (cmd_rc)
d6eb270c
DW		 371 *cmd_rc = xlat_status(nvdimm, buf, cmd,
372 fw_status);
62232e45
DW		 373 } else {
374 dev_err(dev, "%s:%s underrun cmd: %s buf_len: %d out_len: %d\n",
375 __func__, dimm_name, cmd_name, buf_len,
376 offset);
377 rc = -ENXIO;
378 }
2eea6582 379 } else {
62232e45 380 rc = 0;
2eea6582 381 if (cmd_rc)
d6eb270c 382 *cmd_rc = xlat_status(nvdimm, buf, cmd, fw_status);
2eea6582 383 }
62232e45
DW		 384
385 out:
386 ACPI_FREE(out_obj);
387
388 return rc;
b94d5230 389}
a7de92da 390EXPORT_SYMBOL_GPL(acpi_nfit_ctl);
b94d5230
DW		 391
392static const char *spa_type_name(u16 type)
393{
394 static const char *to_name[] = {
395 [NFIT_SPA_VOLATILE] = "volatile",
396 [NFIT_SPA_PM] = "pmem",
397 [NFIT_SPA_DCR] = "dimm-control-region",
398 [NFIT_SPA_BDW] = "block-data-window",
399 [NFIT_SPA_VDISK] = "volatile-disk",
400 [NFIT_SPA_VCD] = "volatile-cd",
401 [NFIT_SPA_PDISK] = "persistent-disk",
402 [NFIT_SPA_PCD] = "persistent-cd",
403
404 };
405
406 if (type > NFIT_SPA_PCD)
407 return "unknown";
408
409 return to_name[type];
410}
411
6839a6d9 412int nfit_spa_type(struct acpi_nfit_system_address *spa)
b94d5230
DW		 413{
414 int i;
415
416 for (i = 0; i < NFIT_UUID_MAX; i++)
41c8bdb3 417 if (guid_equal(to_nfit_uuid(i), (guid_t *)&spa->range_guid))
b94d5230
DW		 418 return i;
419 return -1;
420}
421
422static bool add_spa(struct acpi_nfit_desc *acpi_desc,
20985164 423 struct nfit_table_prev *prev,
b94d5230
DW		 424 struct acpi_nfit_system_address *spa)
425{
426 struct device *dev = acpi_desc->dev;
20985164
VV		 427 struct nfit_spa *nfit_spa;
428
31932041
DW		 429 if (spa->header.length != sizeof(*spa))
430 return false;
431
20985164 432 list_for_each_entry(nfit_spa, &prev->spas, list) {
31932041 433 if (memcmp(nfit_spa->spa, spa, sizeof(*spa)) == 0) {
20985164
VV		 434 list_move_tail(&nfit_spa->list, &acpi_desc->spas);
435 return true;
436 }
437 }
b94d5230 438
31932041
DW		 439 nfit_spa = devm_kzalloc(dev, sizeof(*nfit_spa) + sizeof(*spa),
440 GFP_KERNEL);
b94d5230
DW		 441 if (!nfit_spa)
442 return false;
443 INIT_LIST_HEAD(&nfit_spa->list);
31932041 444 memcpy(nfit_spa->spa, spa, sizeof(*spa));
b94d5230
DW		 445 list_add_tail(&nfit_spa->list, &acpi_desc->spas);
446 dev_dbg(dev, "%s: spa index: %d type: %s\n", __func__,
447 spa->range_index,
448 spa_type_name(nfit_spa_type(spa)));
449 return true;
450}
451
452static bool add_memdev(struct acpi_nfit_desc *acpi_desc,
20985164 453 struct nfit_table_prev *prev,
b94d5230
DW		 454 struct acpi_nfit_memory_map *memdev)
455{
456 struct device *dev = acpi_desc->dev;
20985164 457 struct nfit_memdev *nfit_memdev;
b94d5230 458
31932041
DW		 459 if (memdev->header.length != sizeof(*memdev))
460 return false;
461
20985164 462 list_for_each_entry(nfit_memdev, &prev->memdevs, list)
31932041 463 if (memcmp(nfit_memdev->memdev, memdev, sizeof(*memdev)) == 0) {
20985164
VV		 464 list_move_tail(&nfit_memdev->list, &acpi_desc->memdevs);
465 return true;
466 }
467
31932041
DW		 468 nfit_memdev = devm_kzalloc(dev, sizeof(*nfit_memdev) + sizeof(*memdev),
469 GFP_KERNEL);
b94d5230
DW		 470 if (!nfit_memdev)
471 return false;
472 INIT_LIST_HEAD(&nfit_memdev->list);
31932041 473 memcpy(nfit_memdev->memdev, memdev, sizeof(*memdev));
b94d5230 474 list_add_tail(&nfit_memdev->list, &acpi_desc->memdevs);
caa603aa 475 dev_dbg(dev, "%s: memdev handle: %#x spa: %d dcr: %d flags: %#x\n",
b94d5230 476 __func__, memdev->device_handle, memdev->range_index,
caa603aa 477 memdev->region_index, memdev->flags);
b94d5230
DW		 478 return true;
479}
480
31932041
DW		 481/*
482 * An implementation may provide a truncated control region if no block windows
483 * are defined.
484 */
485static size_t sizeof_dcr(struct acpi_nfit_control_region *dcr)
486{
487 if (dcr->header.length < offsetof(struct acpi_nfit_control_region,
488 window_size))
489 return 0;
490 if (dcr->windows)
491 return sizeof(*dcr);
492 return offsetof(struct acpi_nfit_control_region, window_size);
493}
494
b94d5230 495static bool add_dcr(struct acpi_nfit_desc *acpi_desc,
20985164 496 struct nfit_table_prev *prev,
b94d5230
DW		 497 struct acpi_nfit_control_region *dcr)
498{
499 struct device *dev = acpi_desc->dev;
20985164
VV		 500 struct nfit_dcr *nfit_dcr;
501
31932041
DW		 502 if (!sizeof_dcr(dcr))
503 return false;
504
20985164 505 list_for_each_entry(nfit_dcr, &prev->dcrs, list)
31932041 506 if (memcmp(nfit_dcr->dcr, dcr, sizeof_dcr(dcr)) == 0) {
20985164
VV		 507 list_move_tail(&nfit_dcr->list, &acpi_desc->dcrs);
508 return true;
509 }
b94d5230 510
31932041
DW		 511 nfit_dcr = devm_kzalloc(dev, sizeof(*nfit_dcr) + sizeof(*dcr),
512 GFP_KERNEL);
b94d5230
DW		 513 if (!nfit_dcr)
514 return false;
515 INIT_LIST_HEAD(&nfit_dcr->list);
31932041 516 memcpy(nfit_dcr->dcr, dcr, sizeof_dcr(dcr));
b94d5230
DW		 517 list_add_tail(&nfit_dcr->list, &acpi_desc->dcrs);
518 dev_dbg(dev, "%s: dcr index: %d windows: %d\n", __func__,
519 dcr->region_index, dcr->windows);
520 return true;
521}
522
523static bool add_bdw(struct acpi_nfit_desc *acpi_desc,
20985164 524 struct nfit_table_prev *prev,
b94d5230
DW		 525 struct acpi_nfit_data_region *bdw)
526{
527 struct device *dev = acpi_desc->dev;
20985164
VV		 528 struct nfit_bdw *nfit_bdw;
529
31932041
DW		 530 if (bdw->header.length != sizeof(*bdw))
531 return false;
20985164 532 list_for_each_entry(nfit_bdw, &prev->bdws, list)
31932041 533 if (memcmp(nfit_bdw->bdw, bdw, sizeof(*bdw)) == 0) {
20985164
VV		 534 list_move_tail(&nfit_bdw->list, &acpi_desc->bdws);
535 return true;
536 }
b94d5230 537
31932041
DW		 538 nfit_bdw = devm_kzalloc(dev, sizeof(*nfit_bdw) + sizeof(*bdw),
539 GFP_KERNEL);
b94d5230
DW		 540 if (!nfit_bdw)
541 return false;
542 INIT_LIST_HEAD(&nfit_bdw->list);
31932041 543 memcpy(nfit_bdw->bdw, bdw, sizeof(*bdw));
b94d5230
DW		 544 list_add_tail(&nfit_bdw->list, &acpi_desc->bdws);
545 dev_dbg(dev, "%s: bdw dcr: %d windows: %d\n", __func__,
546 bdw->region_index, bdw->windows);
547 return true;
548}
549
31932041
DW		 550static size_t sizeof_idt(struct acpi_nfit_interleave *idt)
551{
552 if (idt->header.length < sizeof(*idt))
553 return 0;
554 return sizeof(*idt) + sizeof(u32) * (idt->line_count - 1);
555}
556
047fc8a1 557static bool add_idt(struct acpi_nfit_desc *acpi_desc,
20985164 558 struct nfit_table_prev *prev,
047fc8a1
RZ		 559 struct acpi_nfit_interleave *idt)
560{
561 struct device *dev = acpi_desc->dev;
20985164
VV		 562 struct nfit_idt *nfit_idt;
563
31932041
DW		 564 if (!sizeof_idt(idt))
565 return false;
566
567 list_for_each_entry(nfit_idt, &prev->idts, list) {
568 if (sizeof_idt(nfit_idt->idt) != sizeof_idt(idt))
569 continue;
570
571 if (memcmp(nfit_idt->idt, idt, sizeof_idt(idt)) == 0) {
20985164
VV		 572 list_move_tail(&nfit_idt->list, &acpi_desc->idts);
573 return true;
574 }
31932041 575 }
047fc8a1 576
31932041
DW		 577 nfit_idt = devm_kzalloc(dev, sizeof(*nfit_idt) + sizeof_idt(idt),
578 GFP_KERNEL);
047fc8a1
RZ		 579 if (!nfit_idt)
580 return false;
581 INIT_LIST_HEAD(&nfit_idt->list);
31932041 582 memcpy(nfit_idt->idt, idt, sizeof_idt(idt));
047fc8a1
RZ		 583 list_add_tail(&nfit_idt->list, &acpi_desc->idts);
584 dev_dbg(dev, "%s: idt index: %d num_lines: %d\n", __func__,
585 idt->interleave_index, idt->line_count);
586 return true;
587}
588
31932041
DW		 589static size_t sizeof_flush(struct acpi_nfit_flush_address *flush)
590{
591 if (flush->header.length < sizeof(*flush))
592 return 0;
593 return sizeof(*flush) + sizeof(u64) * (flush->hint_count - 1);
594}
595
c2ad2954 596static bool add_flush(struct acpi_nfit_desc *acpi_desc,
20985164 597 struct nfit_table_prev *prev,
c2ad2954
RZ		 598 struct acpi_nfit_flush_address *flush)
599{
600 struct device *dev = acpi_desc->dev;
20985164 601 struct nfit_flush *nfit_flush;
c2ad2954 602
31932041
DW		 603 if (!sizeof_flush(flush))
604 return false;
605
606 list_for_each_entry(nfit_flush, &prev->flushes, list) {
607 if (sizeof_flush(nfit_flush->flush) != sizeof_flush(flush))
608 continue;
609
610 if (memcmp(nfit_flush->flush, flush,
611 sizeof_flush(flush)) == 0) {
20985164
VV		 612 list_move_tail(&nfit_flush->list, &acpi_desc->flushes);
613 return true;
614 }
31932041 615 }
20985164 616
31932041
DW		 617 nfit_flush = devm_kzalloc(dev, sizeof(*nfit_flush)
618 + sizeof_flush(flush), GFP_KERNEL);
c2ad2954
RZ		 619 if (!nfit_flush)
620 return false;
621 INIT_LIST_HEAD(&nfit_flush->list);
31932041 622 memcpy(nfit_flush->flush, flush, sizeof_flush(flush));
c2ad2954
RZ		 623 list_add_tail(&nfit_flush->list, &acpi_desc->flushes);
624 dev_dbg(dev, "%s: nfit_flush handle: %d hint_count: %d\n", __func__,
625 flush->device_handle, flush->hint_count);
626 return true;
627}
628
20985164
VV		 629static void *add_table(struct acpi_nfit_desc *acpi_desc,
630 struct nfit_table_prev *prev, void *table, const void *end)
b94d5230
DW		 631{
632 struct device *dev = acpi_desc->dev;
633 struct acpi_nfit_header *hdr;
634 void *err = ERR_PTR(-ENOMEM);
635
636 if (table >= end)
637 return NULL;
638
639 hdr = table;
564d5011
VV		 640 if (!hdr->length) {
641 dev_warn(dev, "found a zero length table '%d' parsing nfit\n",
642 hdr->type);
643 return NULL;
644 }
645
b94d5230
DW		 646 switch (hdr->type) {
647 case ACPI_NFIT_TYPE_SYSTEM_ADDRESS:
20985164 648 if (!add_spa(acpi_desc, prev, table))
b94d5230
DW		 649 return err;
650 break;
651 case ACPI_NFIT_TYPE_MEMORY_MAP:
20985164 652 if (!add_memdev(acpi_desc, prev, table))
b94d5230
DW		 653 return err;
654 break;
655 case ACPI_NFIT_TYPE_CONTROL_REGION:
20985164 656 if (!add_dcr(acpi_desc, prev, table))
b94d5230
DW		 657 return err;
658 break;
659 case ACPI_NFIT_TYPE_DATA_REGION:
20985164 660 if (!add_bdw(acpi_desc, prev, table))
b94d5230
DW		 661 return err;
662 break;
b94d5230 663 case ACPI_NFIT_TYPE_INTERLEAVE:
20985164 664 if (!add_idt(acpi_desc, prev, table))
047fc8a1 665 return err;
b94d5230
DW		 666 break;
667 case ACPI_NFIT_TYPE_FLUSH_ADDRESS:
20985164 668 if (!add_flush(acpi_desc, prev, table))
c2ad2954 669 return err;
b94d5230
DW		 670 break;
671 case ACPI_NFIT_TYPE_SMBIOS:
672 dev_dbg(dev, "%s: smbios\n", __func__);
673 break;
674 default:
675 dev_err(dev, "unknown table '%d' parsing nfit\n", hdr->type);
676 break;
677 }
678
679 return table + hdr->length;
680}
681
682static void nfit_mem_find_spa_bdw(struct acpi_nfit_desc *acpi_desc,
683 struct nfit_mem *nfit_mem)
684{
685 u32 device_handle = __to_nfit_memdev(nfit_mem)->device_handle;
686 u16 dcr = nfit_mem->dcr->region_index;
687 struct nfit_spa *nfit_spa;
688
689 list_for_each_entry(nfit_spa, &acpi_desc->spas, list) {
690 u16 range_index = nfit_spa->spa->range_index;
691 int type = nfit_spa_type(nfit_spa->spa);
692 struct nfit_memdev *nfit_memdev;
693
694 if (type != NFIT_SPA_BDW)
695 continue;
696
697 list_for_each_entry(nfit_memdev, &acpi_desc->memdevs, list) {
698 if (nfit_memdev->memdev->range_index != range_index)
699 continue;
700 if (nfit_memdev->memdev->device_handle != device_handle)
701 continue;
702 if (nfit_memdev->memdev->region_index != dcr)
703 continue;
704
705 nfit_mem->spa_bdw = nfit_spa->spa;
706 return;
707 }
708 }
709
710 dev_dbg(acpi_desc->dev, "SPA-BDW not found for SPA-DCR %d\n",
711 nfit_mem->spa_dcr->range_index);
712 nfit_mem->bdw = NULL;
713}
714
6697b2cf 715static void nfit_mem_init_bdw(struct acpi_nfit_desc *acpi_desc,
b94d5230
DW		 716 struct nfit_mem *nfit_mem, struct acpi_nfit_system_address *spa)
717{
718 u16 dcr = __to_nfit_memdev(nfit_mem)->region_index;
047fc8a1 719 struct nfit_memdev *nfit_memdev;
b94d5230 720 struct nfit_bdw *nfit_bdw;
047fc8a1
RZ		 721 struct nfit_idt *nfit_idt;
722 u16 idt_idx, range_index;
b94d5230 723
b94d5230
DW		 724 list_for_each_entry(nfit_bdw, &acpi_desc->bdws, list) {
725 if (nfit_bdw->bdw->region_index != dcr)
726 continue;
727 nfit_mem->bdw = nfit_bdw->bdw;
728 break;
729 }
730
731 if (!nfit_mem->bdw)
6697b2cf 732 return;
b94d5230
DW		 733
734 nfit_mem_find_spa_bdw(acpi_desc, nfit_mem);
047fc8a1
RZ		 735
736 if (!nfit_mem->spa_bdw)
6697b2cf 737 return;
047fc8a1
RZ		 738
739 range_index = nfit_mem->spa_bdw->range_index;
740 list_for_each_entry(nfit_memdev, &acpi_desc->memdevs, list) {
741 if (nfit_memdev->memdev->range_index != range_index ||
742 nfit_memdev->memdev->region_index != dcr)
743 continue;
744 nfit_mem->memdev_bdw = nfit_memdev->memdev;
745 idt_idx = nfit_memdev->memdev->interleave_index;
746 list_for_each_entry(nfit_idt, &acpi_desc->idts, list) {
747 if (nfit_idt->idt->interleave_index != idt_idx)
748 continue;
749 nfit_mem->idt_bdw = nfit_idt->idt;
750 break;
751 }
752 break;
753 }
b94d5230
DW		 754}
755
1499934d 756static int __nfit_mem_init(struct acpi_nfit_desc *acpi_desc,
b94d5230
DW		 757 struct acpi_nfit_system_address *spa)
758{
759 struct nfit_mem *nfit_mem, *found;
760 struct nfit_memdev *nfit_memdev;
1499934d 761 int type = spa ? nfit_spa_type(spa) : 0;
b94d5230
DW		 762
763 switch (type) {
764 case NFIT_SPA_DCR:
765 case NFIT_SPA_PM:
766 break;
767 default:
1499934d
DW		 768 if (spa)
769 return 0;
b94d5230
DW		 770 }
771
1499934d
DW		 772 /*
773 * This loop runs in two modes, when a dimm is mapped the loop
774 * adds memdev associations to an existing dimm, or creates a
775 * dimm. In the unmapped dimm case this loop sweeps for memdev
776 * instances with an invalid / zero range_index and adds those
777 * dimms without spa associations.
778 */
b94d5230 779 list_for_each_entry(nfit_memdev, &acpi_desc->memdevs, list) {
ad9ac5e1 780 struct nfit_flush *nfit_flush;
6697b2cf
DW		 781 struct nfit_dcr *nfit_dcr;
782 u32 device_handle;
783 u16 dcr;
b94d5230 784
1499934d
DW		 785 if (spa && nfit_memdev->memdev->range_index != spa->range_index)
786 continue;
787 if (!spa && nfit_memdev->memdev->range_index)
b94d5230
DW		 788 continue;
789 found = NULL;
790 dcr = nfit_memdev->memdev->region_index;
6697b2cf 791 device_handle = nfit_memdev->memdev->device_handle;
b94d5230 792 list_for_each_entry(nfit_mem, &acpi_desc->dimms, list)
6697b2cf
DW		 793 if (__to_nfit_memdev(nfit_mem)->device_handle
794 == device_handle) {
b94d5230
DW		 795 found = nfit_mem;
796 break;
797 }
798
799 if (found)
800 nfit_mem = found;
801 else {
802 nfit_mem = devm_kzalloc(acpi_desc->dev,
803 sizeof(*nfit_mem), GFP_KERNEL);
804 if (!nfit_mem)
805 return -ENOMEM;
806 INIT_LIST_HEAD(&nfit_mem->list);
8cc6ddfc 807 nfit_mem->acpi_desc = acpi_desc;
6697b2cf
DW		 808 list_add(&nfit_mem->list, &acpi_desc->dimms);
809 }
810
811 list_for_each_entry(nfit_dcr, &acpi_desc->dcrs, list) {
812 if (nfit_dcr->dcr->region_index != dcr)
813 continue;
814 /*
815 * Record the control region for the dimm. For
816 * the ACPI 6.1 case, where there are separate
817 * control regions for the pmem vs blk
818 * interfaces, be sure to record the extended
819 * blk details.
820 */
821 if (!nfit_mem->dcr)
822 nfit_mem->dcr = nfit_dcr->dcr;
823 else if (nfit_mem->dcr->windows == 0
824 && nfit_dcr->dcr->windows)
825 nfit_mem->dcr = nfit_dcr->dcr;
826 break;
827 }
828
ad9ac5e1 829 list_for_each_entry(nfit_flush, &acpi_desc->flushes, list) {
e5ae3b25
DW		 830 struct acpi_nfit_flush_address *flush;
831 u16 i;
832
ad9ac5e1
DW		 833 if (nfit_flush->flush->device_handle != device_handle)
834 continue;
835 nfit_mem->nfit_flush = nfit_flush;
e5ae3b25
DW		 836 flush = nfit_flush->flush;
837 nfit_mem->flush_wpq = devm_kzalloc(acpi_desc->dev,
838 flush->hint_count
839 * sizeof(struct resource), GFP_KERNEL);
840 if (!nfit_mem->flush_wpq)
841 return -ENOMEM;
842 for (i = 0; i < flush->hint_count; i++) {
843 struct resource *res = &nfit_mem->flush_wpq[i];
844
845 res->start = flush->hint_address[i];
846 res->end = res->start + 8 - 1;
847 }
ad9ac5e1
DW		 848 break;
849 }
850
6697b2cf
DW		 851 if (dcr && !nfit_mem->dcr) {
852 dev_err(acpi_desc->dev, "SPA %d missing DCR %d\n",
853 spa->range_index, dcr);
854 return -ENODEV;
b94d5230
DW		 855 }
856
857 if (type == NFIT_SPA_DCR) {
047fc8a1
RZ		 858 struct nfit_idt *nfit_idt;
859 u16 idt_idx;
860
b94d5230
DW		 861 /* multiple dimms may share a SPA when interleaved */
862 nfit_mem->spa_dcr = spa;
863 nfit_mem->memdev_dcr = nfit_memdev->memdev;
047fc8a1
RZ		 864 idt_idx = nfit_memdev->memdev->interleave_index;
865 list_for_each_entry(nfit_idt, &acpi_desc->idts, list) {
866 if (nfit_idt->idt->interleave_index != idt_idx)
867 continue;
868 nfit_mem->idt_dcr = nfit_idt->idt;
869 break;
870 }
6697b2cf 871 nfit_mem_init_bdw(acpi_desc, nfit_mem, spa);
1499934d 872 } else if (type == NFIT_SPA_PM) {
b94d5230
DW		 873 /*
874 * A single dimm may belong to multiple SPA-PM
875 * ranges, record at least one in addition to
876 * any SPA-DCR range.
877 */
878 nfit_mem->memdev_pmem = nfit_memdev->memdev;
1499934d
DW		 879 } else
880 nfit_mem->memdev_dcr = nfit_memdev->memdev;
b94d5230
DW		 881 }
882
883 return 0;
884}
885
886static int nfit_mem_cmp(void *priv, struct list_head *_a, struct list_head *_b)
887{
888 struct nfit_mem *a = container_of(_a, typeof(*a), list);
889 struct nfit_mem *b = container_of(_b, typeof(*b), list);
890 u32 handleA, handleB;
891
892 handleA = __to_nfit_memdev(a)->device_handle;
893 handleB = __to_nfit_memdev(b)->device_handle;
894 if (handleA < handleB)
895 return -1;
896 else if (handleA > handleB)
897 return 1;
898 return 0;
899}
900
901static int nfit_mem_init(struct acpi_nfit_desc *acpi_desc)
902{
903 struct nfit_spa *nfit_spa;
1499934d
DW		 904 int rc;
905
b94d5230
DW		 906
907 /*
908 * For each SPA-DCR or SPA-PMEM address range find its
909 * corresponding MEMDEV(s). From each MEMDEV find the
910 * corresponding DCR. Then, if we're operating on a SPA-DCR,
911 * try to find a SPA-BDW and a corresponding BDW that references
912 * the DCR. Throw it all into an nfit_mem object. Note, that
913 * BDWs are optional.
914 */
915 list_for_each_entry(nfit_spa, &acpi_desc->spas, list) {
1499934d 916 rc = __nfit_mem_init(acpi_desc, nfit_spa->spa);
b94d5230
DW		 917 if (rc)
918 return rc;
919 }
920
1499934d
DW		 921 /*
922 * If a DIMM has failed to be mapped into SPA there will be no
923 * SPA entries above. Find and register all the unmapped DIMMs
924 * for reporting and recovery purposes.
925 */
926 rc = __nfit_mem_init(acpi_desc, NULL);
927 if (rc)
928 return rc;
929
b94d5230
DW		 930 list_sort(NULL, &acpi_desc->dimms, nfit_mem_cmp);
931
932 return 0;
933}
934
41f95db7
JH		 935static ssize_t bus_dsm_mask_show(struct device *dev,
936 struct device_attribute *attr, char *buf)
937{
938 struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev);
939 struct nvdimm_bus_descriptor *nd_desc = to_nd_desc(nvdimm_bus);
940
941 return sprintf(buf, "%#lx\n", nd_desc->bus_dsm_mask);
942}
943static struct device_attribute dev_attr_bus_dsm_mask =
944 __ATTR(dsm_mask, 0444, bus_dsm_mask_show, NULL);
945
45def22c
DW		 946static ssize_t revision_show(struct device *dev,
947 struct device_attribute *attr, char *buf)
948{
949 struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev);
950 struct nvdimm_bus_descriptor *nd_desc = to_nd_desc(nvdimm_bus);
951 struct acpi_nfit_desc *acpi_desc = to_acpi_desc(nd_desc);
952
6b577c9d 953 return sprintf(buf, "%d\n", acpi_desc->acpi_header.revision);
45def22c
DW		 954}
955static DEVICE_ATTR_RO(revision);
956
9ffd6350
VV		 957static ssize_t hw_error_scrub_show(struct device *dev,
958 struct device_attribute *attr, char *buf)
959{
960 struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev);
961 struct nvdimm_bus_descriptor *nd_desc = to_nd_desc(nvdimm_bus);
962 struct acpi_nfit_desc *acpi_desc = to_acpi_desc(nd_desc);
963
964 return sprintf(buf, "%d\n", acpi_desc->scrub_mode);
965}
966
967/*
968 * The 'hw_error_scrub' attribute can have the following values written to it:
969 * '0': Switch to the default mode where an exception will only insert
970 * the address of the memory error into the poison and badblocks lists.
971 * '1': Enable a full scrub to happen if an exception for a memory error is
972 * received.
973 */
974static ssize_t hw_error_scrub_store(struct device *dev,
975 struct device_attribute *attr, const char *buf, size_t size)
976{
977 struct nvdimm_bus_descriptor *nd_desc;
978 ssize_t rc;
979 long val;
980
981 rc = kstrtol(buf, 0, &val);
982 if (rc)
983 return rc;
984
985 device_lock(dev);
986 nd_desc = dev_get_drvdata(dev);
987 if (nd_desc) {
988 struct acpi_nfit_desc *acpi_desc = to_acpi_desc(nd_desc);
989
990 switch (val) {
991 case HW_ERROR_SCRUB_ON:
992 acpi_desc->scrub_mode = HW_ERROR_SCRUB_ON;
993 break;
994 case HW_ERROR_SCRUB_OFF:
995 acpi_desc->scrub_mode = HW_ERROR_SCRUB_OFF;
996 break;
997 default:
998 rc = -EINVAL;
999 break;
1000 }
1001 }
1002 device_unlock(dev);
1003 if (rc)
1004 return rc;
1005 return size;
1006}
1007static DEVICE_ATTR_RW(hw_error_scrub);
1008
37b137ff
VV		 1009/*
1010 * This shows the number of full Address Range Scrubs that have been
1011 * completed since driver load time. Userspace can wait on this using
1012 * select/poll etc. A '+' at the end indicates an ARS is in progress
1013 */
1014static ssize_t scrub_show(struct device *dev,
1015 struct device_attribute *attr, char *buf)
1016{
1017 struct nvdimm_bus_descriptor *nd_desc;
1018 ssize_t rc = -ENXIO;
1019
1020 device_lock(dev);
1021 nd_desc = dev_get_drvdata(dev);
1022 if (nd_desc) {
1023 struct acpi_nfit_desc *acpi_desc = to_acpi_desc(nd_desc);
1024
1025 rc = sprintf(buf, "%d%s", acpi_desc->scrub_count,
1026 (work_busy(&acpi_desc->work)) ? "+\n" : "\n");
1027 }
1028 device_unlock(dev);
1029 return rc;
1030}
1031
37b137ff
VV		 1032static ssize_t scrub_store(struct device *dev,
1033 struct device_attribute *attr, const char *buf, size_t size)
1034{
1035 struct nvdimm_bus_descriptor *nd_desc;
1036 ssize_t rc;
1037 long val;
1038
1039 rc = kstrtol(buf, 0, &val);
1040 if (rc)
1041 return rc;
1042 if (val != 1)
1043 return -EINVAL;
1044
1045 device_lock(dev);
1046 nd_desc = dev_get_drvdata(dev);
1047 if (nd_desc) {
1048 struct acpi_nfit_desc *acpi_desc = to_acpi_desc(nd_desc);
1049
80790039 1050 rc = acpi_nfit_ars_rescan(acpi_desc, 0);
37b137ff
VV		 1051 }
1052 device_unlock(dev);
1053 if (rc)
1054 return rc;
1055 return size;
1056}
1057static DEVICE_ATTR_RW(scrub);
1058
1059static bool ars_supported(struct nvdimm_bus *nvdimm_bus)
1060{
1061 struct nvdimm_bus_descriptor *nd_desc = to_nd_desc(nvdimm_bus);
1062 const unsigned long mask = 1 << ND_CMD_ARS_CAP | 1 << ND_CMD_ARS_START
1063 | 1 << ND_CMD_ARS_STATUS;
1064
1065 return (nd_desc->cmd_mask & mask) == mask;
1066}
1067
1068static umode_t nfit_visible(struct kobject *kobj, struct attribute *a, int n)
1069{
1070 struct device *dev = container_of(kobj, struct device, kobj);
1071 struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev);
1072
1073 if (a == &dev_attr_scrub.attr && !ars_supported(nvdimm_bus))
1074 return 0;
1075 return a->mode;
1076}
1077
45def22c
DW		 1078static struct attribute *acpi_nfit_attributes[] = {
1079 &dev_attr_revision.attr,
37b137ff 1080 &dev_attr_scrub.attr,
9ffd6350 1081 &dev_attr_hw_error_scrub.attr,
41f95db7 1082 &dev_attr_bus_dsm_mask.attr,
45def22c
DW		 1083 NULL,
1084};
1085
5e93746f 1086static const struct attribute_group acpi_nfit_attribute_group = {
45def22c
DW		 1087 .name = "nfit",
1088 .attrs = acpi_nfit_attributes,
37b137ff 1089 .is_visible = nfit_visible,
45def22c
DW		 1090};
1091
a61fe6f7 1092static const struct attribute_group *acpi_nfit_attribute_groups[] = {
45def22c
DW		 1093 &nvdimm_bus_attribute_group,
1094 &acpi_nfit_attribute_group,
1095 NULL,
1096};
1097
e6dfb2de
DW		 1098static struct acpi_nfit_memory_map *to_nfit_memdev(struct device *dev)
1099{
1100 struct nvdimm *nvdimm = to_nvdimm(dev);
1101 struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
1102
1103 return __to_nfit_memdev(nfit_mem);
1104}
1105
1106static struct acpi_nfit_control_region *to_nfit_dcr(struct device *dev)
1107{
1108 struct nvdimm *nvdimm = to_nvdimm(dev);
1109 struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
1110
1111 return nfit_mem->dcr;
1112}
1113
1114static ssize_t handle_show(struct device *dev,
1115 struct device_attribute *attr, char *buf)
1116{
1117 struct acpi_nfit_memory_map *memdev = to_nfit_memdev(dev);
1118
1119 return sprintf(buf, "%#x\n", memdev->device_handle);
1120}
1121static DEVICE_ATTR_RO(handle);
1122
1123static ssize_t phys_id_show(struct device *dev,
1124 struct device_attribute *attr, char *buf)
1125{
1126 struct acpi_nfit_memory_map *memdev = to_nfit_memdev(dev);
1127
1128 return sprintf(buf, "%#x\n", memdev->physical_id);
1129}
1130static DEVICE_ATTR_RO(phys_id);
1131
1132static ssize_t vendor_show(struct device *dev,
1133 struct device_attribute *attr, char *buf)
1134{
1135 struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev);
1136
5ad9a7fd 1137 return sprintf(buf, "0x%04x\n", be16_to_cpu(dcr->vendor_id));
e6dfb2de
DW		 1138}
1139static DEVICE_ATTR_RO(vendor);
1140
1141static ssize_t rev_id_show(struct device *dev,
1142 struct device_attribute *attr, char *buf)
1143{
1144 struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev);
1145
5ad9a7fd 1146 return sprintf(buf, "0x%04x\n", be16_to_cpu(dcr->revision_id));
e6dfb2de
DW		 1147}
1148static DEVICE_ATTR_RO(rev_id);
1149
1150static ssize_t device_show(struct device *dev,
1151 struct device_attribute *attr, char *buf)
1152{
1153 struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev);
1154
5ad9a7fd 1155 return sprintf(buf, "0x%04x\n", be16_to_cpu(dcr->device_id));
e6dfb2de
DW		 1156}
1157static DEVICE_ATTR_RO(device);
1158
6ca72085
DW		 1159static ssize_t subsystem_vendor_show(struct device *dev,
1160 struct device_attribute *attr, char *buf)
1161{
1162 struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev);
1163
1164 return sprintf(buf, "0x%04x\n", be16_to_cpu(dcr->subsystem_vendor_id));
1165}
1166static DEVICE_ATTR_RO(subsystem_vendor);
1167
1168static ssize_t subsystem_rev_id_show(struct device *dev,
1169 struct device_attribute *attr, char *buf)
1170{
1171 struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev);
1172
1173 return sprintf(buf, "0x%04x\n",
1174 be16_to_cpu(dcr->subsystem_revision_id));
1175}
1176static DEVICE_ATTR_RO(subsystem_rev_id);
1177
1178static ssize_t subsystem_device_show(struct device *dev,
1179 struct device_attribute *attr, char *buf)
1180{
1181 struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev);
1182
1183 return sprintf(buf, "0x%04x\n", be16_to_cpu(dcr->subsystem_device_id));
1184}
1185static DEVICE_ATTR_RO(subsystem_device);
1186
8cc6ddfc
DW		 1187static int num_nvdimm_formats(struct nvdimm *nvdimm)
1188{
1189 struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
1190 int formats = 0;
1191
1192 if (nfit_mem->memdev_pmem)
1193 formats++;
1194 if (nfit_mem->memdev_bdw)
1195 formats++;
1196 return formats;
1197}
1198
e6dfb2de
DW		 1199static ssize_t format_show(struct device *dev,
1200 struct device_attribute *attr, char *buf)
1201{
1202 struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev);
1203
1bcbf42d 1204 return sprintf(buf, "0x%04x\n", le16_to_cpu(dcr->code));
e6dfb2de
DW		 1205}
1206static DEVICE_ATTR_RO(format);
1207
8cc6ddfc
DW		 1208static ssize_t format1_show(struct device *dev,
1209 struct device_attribute *attr, char *buf)
1210{
1211 u32 handle;
1212 ssize_t rc = -ENXIO;
1213 struct nfit_mem *nfit_mem;
1214 struct nfit_memdev *nfit_memdev;
1215 struct acpi_nfit_desc *acpi_desc;
1216 struct nvdimm *nvdimm = to_nvdimm(dev);
1217 struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev);
1218
1219 nfit_mem = nvdimm_provider_data(nvdimm);
1220 acpi_desc = nfit_mem->acpi_desc;
1221 handle = to_nfit_memdev(dev)->device_handle;
1222
1223 /* assumes DIMMs have at most 2 published interface codes */
1224 mutex_lock(&acpi_desc->init_mutex);
1225 list_for_each_entry(nfit_memdev, &acpi_desc->memdevs, list) {
1226 struct acpi_nfit_memory_map *memdev = nfit_memdev->memdev;
1227 struct nfit_dcr *nfit_dcr;
1228
1229 if (memdev->device_handle != handle)
1230 continue;
1231
1232 list_for_each_entry(nfit_dcr, &acpi_desc->dcrs, list) {
1233 if (nfit_dcr->dcr->region_index != memdev->region_index)
1234 continue;
1235 if (nfit_dcr->dcr->code == dcr->code)
1236 continue;
1bcbf42d
DW		 1237 rc = sprintf(buf, "0x%04x\n",
1238 le16_to_cpu(nfit_dcr->dcr->code));
8cc6ddfc
DW		 1239 break;
1240 }
1241 if (rc != ENXIO)
1242 break;
1243 }
1244 mutex_unlock(&acpi_desc->init_mutex);
1245 return rc;
1246}
1247static DEVICE_ATTR_RO(format1);
1248
1249static ssize_t formats_show(struct device *dev,
1250 struct device_attribute *attr, char *buf)
1251{
1252 struct nvdimm *nvdimm = to_nvdimm(dev);
1253
1254 return sprintf(buf, "%d\n", num_nvdimm_formats(nvdimm));
1255}
1256static DEVICE_ATTR_RO(formats);
1257
e6dfb2de
DW		 1258static ssize_t serial_show(struct device *dev,
1259 struct device_attribute *attr, char *buf)
1260{
1261 struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev);
1262
5ad9a7fd 1263 return sprintf(buf, "0x%08x\n", be32_to_cpu(dcr->serial_number));
e6dfb2de
DW		 1264}
1265static DEVICE_ATTR_RO(serial);
1266
a94e3fbe
DW		 1267static ssize_t family_show(struct device *dev,
1268 struct device_attribute *attr, char *buf)
1269{
1270 struct nvdimm *nvdimm = to_nvdimm(dev);
1271 struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
1272
1273 if (nfit_mem->family < 0)
1274 return -ENXIO;
1275 return sprintf(buf, "%d\n", nfit_mem->family);
1276}
1277static DEVICE_ATTR_RO(family);
1278
1279static ssize_t dsm_mask_show(struct device *dev,
1280 struct device_attribute *attr, char *buf)
1281{
1282 struct nvdimm *nvdimm = to_nvdimm(dev);
1283 struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
1284
1285 if (nfit_mem->family < 0)
1286 return -ENXIO;
1287 return sprintf(buf, "%#lx\n", nfit_mem->dsm_mask);
1288}
1289static DEVICE_ATTR_RO(dsm_mask);
1290
58138820
DW		 1291static ssize_t flags_show(struct device *dev,
1292 struct device_attribute *attr, char *buf)
1293{
1294 u16 flags = to_nfit_memdev(dev)->flags;
1295
ffab9385 1296 return sprintf(buf, "%s%s%s%s%s%s%s\n",
402bae59
TK		 1297 flags & ACPI_NFIT_MEM_SAVE_FAILED ? "save_fail " : "",
1298 flags & ACPI_NFIT_MEM_RESTORE_FAILED ? "restore_fail " : "",
1299 flags & ACPI_NFIT_MEM_FLUSH_FAILED ? "flush_fail " : "",
ca321d1c 1300 flags & ACPI_NFIT_MEM_NOT_ARMED ? "not_armed " : "",
ffab9385
DW		 1301 flags & ACPI_NFIT_MEM_HEALTH_OBSERVED ? "smart_event " : "",
1302 flags & ACPI_NFIT_MEM_MAP_FAILED ? "map_fail " : "",
1303 flags & ACPI_NFIT_MEM_HEALTH_ENABLED ? "smart_notify " : "");
58138820
DW		 1304}
1305static DEVICE_ATTR_RO(flags);
1306
38a879ba
TK		 1307static ssize_t id_show(struct device *dev,
1308 struct device_attribute *attr, char *buf)
1309{
1310 struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev);
1311
1312 if (dcr->valid_fields & ACPI_NFIT_CONTROL_MFG_INFO_VALID)
1313 return sprintf(buf, "%04x-%02x-%04x-%08x\n",
1314 be16_to_cpu(dcr->vendor_id),
1315 dcr->manufacturing_location,
1316 be16_to_cpu(dcr->manufacturing_date),
1317 be32_to_cpu(dcr->serial_number));
1318 else
1319 return sprintf(buf, "%04x-%08x\n",
1320 be16_to_cpu(dcr->vendor_id),
1321 be32_to_cpu(dcr->serial_number));
1322}
1323static DEVICE_ATTR_RO(id);
1324
e6dfb2de
DW		 1325static struct attribute *acpi_nfit_dimm_attributes[] = {
1326 &dev_attr_handle.attr,
1327 &dev_attr_phys_id.attr,
1328 &dev_attr_vendor.attr,
1329 &dev_attr_device.attr,
6ca72085
DW		 1330 &dev_attr_rev_id.attr,
1331 &dev_attr_subsystem_vendor.attr,
1332 &dev_attr_subsystem_device.attr,
1333 &dev_attr_subsystem_rev_id.attr,
e6dfb2de 1334 &dev_attr_format.attr,
8cc6ddfc
DW		 1335 &dev_attr_formats.attr,
1336 &dev_attr_format1.attr,
e6dfb2de 1337 &dev_attr_serial.attr,
58138820 1338 &dev_attr_flags.attr,
38a879ba 1339 &dev_attr_id.attr,
a94e3fbe
DW		 1340 &dev_attr_family.attr,
1341 &dev_attr_dsm_mask.attr,
e6dfb2de
DW		 1342 NULL,
1343};
1344
1345static umode_t acpi_nfit_dimm_attr_visible(struct kobject *kobj,
1346 struct attribute *a, int n)
1347{
1348 struct device *dev = container_of(kobj, struct device, kobj);
8cc6ddfc 1349 struct nvdimm *nvdimm = to_nvdimm(dev);
e6dfb2de 1350
1499934d
DW		 1351 if (!to_nfit_dcr(dev)) {
1352 /* Without a dcr only the memdev attributes can be surfaced */
1353 if (a == &dev_attr_handle.attr || a == &dev_attr_phys_id.attr
1354 || a == &dev_attr_flags.attr
1355 || a == &dev_attr_family.attr
1356 || a == &dev_attr_dsm_mask.attr)
1357 return a->mode;
8cc6ddfc 1358 return 0;
1499934d
DW		 1359 }
1360
8cc6ddfc 1361 if (a == &dev_attr_format1.attr && num_nvdimm_formats(nvdimm) <= 1)
e6dfb2de 1362 return 0;
8cc6ddfc 1363 return a->mode;
e6dfb2de
DW		 1364}
1365
5e93746f 1366static const struct attribute_group acpi_nfit_dimm_attribute_group = {
e6dfb2de
DW		 1367 .name = "nfit",
1368 .attrs = acpi_nfit_dimm_attributes,
1369 .is_visible = acpi_nfit_dimm_attr_visible,
1370};
1371
1372static const struct attribute_group *acpi_nfit_dimm_attribute_groups[] = {
62232e45 1373 &nvdimm_attribute_group,
4d88a97a 1374 &nd_device_attribute_group,
e6dfb2de
DW		 1375 &acpi_nfit_dimm_attribute_group,
1376 NULL,
1377};
1378
1379static struct nvdimm *acpi_nfit_dimm_by_handle(struct acpi_nfit_desc *acpi_desc,
1380 u32 device_handle)
1381{
1382 struct nfit_mem *nfit_mem;
1383
1384 list_for_each_entry(nfit_mem, &acpi_desc->dimms, list)
1385 if (__to_nfit_memdev(nfit_mem)->device_handle == device_handle)
1386 return nfit_mem->nvdimm;
1387
1388 return NULL;
1389}
1390
231bf117 1391void __acpi_nvdimm_notify(struct device *dev, u32 event)
ba9c8dd3
DW		 1392{
1393 struct nfit_mem *nfit_mem;
1394 struct acpi_nfit_desc *acpi_desc;
1395
1396 dev_dbg(dev->parent, "%s: %s: event: %d\n", dev_name(dev), __func__,
1397 event);
1398
1399 if (event != NFIT_NOTIFY_DIMM_HEALTH) {
1400 dev_dbg(dev->parent, "%s: unknown event: %d\n", dev_name(dev),
1401 event);
1402 return;
1403 }
1404
1405 acpi_desc = dev_get_drvdata(dev->parent);
1406 if (!acpi_desc)
1407 return;
1408
1409 /*
1410 * If we successfully retrieved acpi_desc, then we know nfit_mem data
1411 * is still valid.
1412 */
1413 nfit_mem = dev_get_drvdata(dev);
1414 if (nfit_mem && nfit_mem->flags_attr)
1415 sysfs_notify_dirent(nfit_mem->flags_attr);
1416}
231bf117 1417EXPORT_SYMBOL_GPL(__acpi_nvdimm_notify);
ba9c8dd3
DW		 1418
1419static void acpi_nvdimm_notify(acpi_handle handle, u32 event, void *data)
1420{
1421 struct acpi_device *adev = data;
1422 struct device *dev = &adev->dev;
1423
1424 device_lock(dev->parent);
1425 __acpi_nvdimm_notify(dev, event);
1426 device_unlock(dev->parent);
1427}
1428
62232e45
DW		 1429static int acpi_nfit_add_dimm(struct acpi_nfit_desc *acpi_desc,
1430 struct nfit_mem *nfit_mem, u32 device_handle)
1431{
1432 struct acpi_device *adev, *adev_dimm;
1433 struct device *dev = acpi_desc->dev;
31eca76b 1434 unsigned long dsm_mask;
41c8bdb3 1435 const guid_t *guid;
60e95f43 1436 int i;
ba650cfc 1437 int family = -1;
62232e45 1438
e3654eca
DW		 1439 /* nfit test assumes 1:1 relationship between commands and dsms */
1440 nfit_mem->dsm_mask = acpi_desc->dimm_cmd_force_en;
31eca76b 1441 nfit_mem->family = NVDIMM_FAMILY_INTEL;
62232e45
DW		 1442 adev = to_acpi_dev(acpi_desc);
1443 if (!adev)
1444 return 0;
1445
1446 adev_dimm = acpi_find_child_device(adev, device_handle, false);
1447 nfit_mem->adev = adev_dimm;
1448 if (!adev_dimm) {
1449 dev_err(dev, "no ACPI.NFIT device with _ADR %#x, disabling...\n",
1450 device_handle);
4d88a97a 1451 return force_enable_dimms ? 0 : -ENODEV;
62232e45
DW		 1452 }
1453
ba9c8dd3
DW		 1454 if (ACPI_FAILURE(acpi_install_notify_handler(adev_dimm->handle,
1455 ACPI_DEVICE_NOTIFY, acpi_nvdimm_notify, adev_dimm))) {
1456 dev_err(dev, "%s: notification registration failed\n",
1457 dev_name(&adev_dimm->dev));
1458 return -ENXIO;
1459 }
1460
31eca76b 1461 /*
e02fb726 1462 * Until standardization materializes we need to consider 4
a7225598 1463 * different command sets. Note, that checking for function0 (bit0)
41c8bdb3 1464 * tells us if any commands are reachable through this GUID.
31eca76b 1465 */
e02fb726 1466 for (i = NVDIMM_FAMILY_INTEL; i <= NVDIMM_FAMILY_MSFT; i++)
a7225598 1467 if (acpi_check_dsm(adev_dimm->handle, to_nfit_uuid(i), 1, 1))
ba650cfc
LK		 1468 if (family < 0 || i == default_dsm_family)
1469 family = i;
31eca76b
DW		 1470
1471 /* limit the supported commands to those that are publicly documented */
ba650cfc 1472 nfit_mem->family = family;
095ab4b3
LK		 1473 if (override_dsm_mask && !disable_vendor_specific)
1474 dsm_mask = override_dsm_mask;
1475 else if (nfit_mem->family == NVDIMM_FAMILY_INTEL) {
31eca76b 1476 dsm_mask = 0x3fe;
87554098
DW		 1477 if (disable_vendor_specific)
1478 dsm_mask &= ~(1 << ND_CMD_VENDOR);
e02fb726 1479 } else if (nfit_mem->family == NVDIMM_FAMILY_HPE1) {
31eca76b 1480 dsm_mask = 0x1c3c76;
e02fb726 1481 } else if (nfit_mem->family == NVDIMM_FAMILY_HPE2) {
31eca76b 1482 dsm_mask = 0x1fe;
87554098
DW		 1483 if (disable_vendor_specific)
1484 dsm_mask &= ~(1 << 8);
e02fb726 1485 } else if (nfit_mem->family == NVDIMM_FAMILY_MSFT) {
1486 dsm_mask = 0xffffffff;
87554098 1487 } else {
a7225598 1488 dev_dbg(dev, "unknown dimm command family\n");
31eca76b 1489 nfit_mem->family = -1;
a7225598
DW		 1490 /* DSMs are optional, continue loading the driver... */
1491 return 0;
31eca76b
DW		 1492 }
1493
41c8bdb3 1494 guid = to_nfit_uuid(nfit_mem->family);
31eca76b 1495 for_each_set_bit(i, &dsm_mask, BITS_PER_LONG)
94116f81 1496 if (acpi_check_dsm(adev_dimm->handle, guid, 1, 1ULL << i))
62232e45
DW		 1497 set_bit(i, &nfit_mem->dsm_mask);
1498
60e95f43 1499 return 0;
62232e45
DW		 1500}
1501
ba9c8dd3
DW		 1502static void shutdown_dimm_notify(void *data)
1503{
1504 struct acpi_nfit_desc *acpi_desc = data;
1505 struct nfit_mem *nfit_mem;
1506
1507 mutex_lock(&acpi_desc->init_mutex);
1508 /*
1509 * Clear out the nfit_mem->flags_attr and shut down dimm event
1510 * notifications.
1511 */
1512 list_for_each_entry(nfit_mem, &acpi_desc->dimms, list) {
231bf117
DW		 1513 struct acpi_device *adev_dimm = nfit_mem->adev;
1514
ba9c8dd3
DW		 1515 if (nfit_mem->flags_attr) {
1516 sysfs_put(nfit_mem->flags_attr);
1517 nfit_mem->flags_attr = NULL;
1518 }
231bf117
DW		 1519 if (adev_dimm)
1520 acpi_remove_notify_handler(adev_dimm->handle,
1521 ACPI_DEVICE_NOTIFY, acpi_nvdimm_notify);
ba9c8dd3
DW		 1522 }
1523 mutex_unlock(&acpi_desc->init_mutex);
1524}
1525
e6dfb2de
DW		 1526static int acpi_nfit_register_dimms(struct acpi_nfit_desc *acpi_desc)
1527{
1528 struct nfit_mem *nfit_mem;
ba9c8dd3
DW		 1529 int dimm_count = 0, rc;
1530 struct nvdimm *nvdimm;
e6dfb2de
DW		 1531
1532 list_for_each_entry(nfit_mem, &acpi_desc->dimms, list) {
e5ae3b25 1533 struct acpi_nfit_flush_address *flush;
31eca76b 1534 unsigned long flags = 0, cmd_mask;
caa603aa 1535 struct nfit_memdev *nfit_memdev;
e6dfb2de 1536 u32 device_handle;
58138820 1537 u16 mem_flags;
e6dfb2de
DW		 1538
1539 device_handle = __to_nfit_memdev(nfit_mem)->device_handle;
1540 nvdimm = acpi_nfit_dimm_by_handle(acpi_desc, device_handle);
1541 if (nvdimm) {
20985164 1542 dimm_count++;
e6dfb2de
DW		 1543 continue;
1544 }
1545
1546 if (nfit_mem->bdw && nfit_mem->memdev_pmem)
8f078b38 1547 set_bit(NDD_ALIASING, &flags);
e6dfb2de 1548
caa603aa
DW		 1549 /* collate flags across all memdevs for this dimm */
1550 list_for_each_entry(nfit_memdev, &acpi_desc->memdevs, list) {
1551 struct acpi_nfit_memory_map *dimm_memdev;
1552
1553 dimm_memdev = __to_nfit_memdev(nfit_mem);
1554 if (dimm_memdev->device_handle
1555 != nfit_memdev->memdev->device_handle)
1556 continue;
1557 dimm_memdev->flags |= nfit_memdev->memdev->flags;
1558 }
1559
58138820 1560 mem_flags = __to_nfit_memdev(nfit_mem)->flags;
ca321d1c 1561 if (mem_flags & ACPI_NFIT_MEM_NOT_ARMED)
8f078b38 1562 set_bit(NDD_UNARMED, &flags);
58138820 1563
62232e45
DW		 1564 rc = acpi_nfit_add_dimm(acpi_desc, nfit_mem, device_handle);
1565 if (rc)
1566 continue;
1567
e3654eca 1568 /*
31eca76b
DW		 1569 * TODO: provide translation for non-NVDIMM_FAMILY_INTEL
1570 * devices (i.e. from nd_cmd to acpi_dsm) to standardize the
1571 * userspace interface.
e3654eca 1572 */
31eca76b
DW		 1573 cmd_mask = 1UL << ND_CMD_CALL;
1574 if (nfit_mem->family == NVDIMM_FAMILY_INTEL)
1575 cmd_mask |= nfit_mem->dsm_mask;
1576
e5ae3b25
DW		 1577 flush = nfit_mem->nfit_flush ? nfit_mem->nfit_flush->flush
1578 : NULL;
e6dfb2de 1579 nvdimm = nvdimm_create(acpi_desc->nvdimm_bus, nfit_mem,
62232e45 1580 acpi_nfit_dimm_attribute_groups,
e5ae3b25
DW		 1581 flags, cmd_mask, flush ? flush->hint_count : 0,
1582 nfit_mem->flush_wpq);
e6dfb2de
DW		 1583 if (!nvdimm)
1584 return -ENOMEM;
1585
1586 nfit_mem->nvdimm = nvdimm;
4d88a97a 1587 dimm_count++;
58138820
DW		 1588
1589 if ((mem_flags & ACPI_NFIT_MEM_FAILED_MASK) == 0)
1590 continue;
1591
1499934d 1592 dev_info(acpi_desc->dev, "%s flags:%s%s%s%s%s\n",
58138820 1593 nvdimm_name(nvdimm),
402bae59
TK		 1594 mem_flags & ACPI_NFIT_MEM_SAVE_FAILED ? " save_fail" : "",
1595 mem_flags & ACPI_NFIT_MEM_RESTORE_FAILED ? " restore_fail":"",
1596 mem_flags & ACPI_NFIT_MEM_FLUSH_FAILED ? " flush_fail" : "",
1499934d
DW		 1597 mem_flags & ACPI_NFIT_MEM_NOT_ARMED ? " not_armed" : "",
1598 mem_flags & ACPI_NFIT_MEM_MAP_FAILED ? " map_fail" : "");
58138820 1599
e6dfb2de
DW		 1600 }
1601
ba9c8dd3
DW		 1602 rc = nvdimm_bus_check_dimm_count(acpi_desc->nvdimm_bus, dimm_count);
1603 if (rc)
1604 return rc;
1605
1606 /*
1607 * Now that dimms are successfully registered, and async registration
1608 * is flushed, attempt to enable event notification.
1609 */
1610 list_for_each_entry(nfit_mem, &acpi_desc->dimms, list) {
1611 struct kernfs_node *nfit_kernfs;
1612
1613 nvdimm = nfit_mem->nvdimm;
1614 nfit_kernfs = sysfs_get_dirent(nvdimm_kobj(nvdimm)->sd, "nfit");
1615 if (nfit_kernfs)
1616 nfit_mem->flags_attr = sysfs_get_dirent(nfit_kernfs,
1617 "flags");
1618 sysfs_put(nfit_kernfs);
1619 if (!nfit_mem->flags_attr)
1620 dev_warn(acpi_desc->dev, "%s: notifications disabled\n",
1621 nvdimm_name(nvdimm));
1622 }
1623
1624 return devm_add_action_or_reset(acpi_desc->dev, shutdown_dimm_notify,
1625 acpi_desc);
e6dfb2de
DW		 1626}
1627
7db5bb33
JH		 1628/*
1629 * These constants are private because there are no kernel consumers of
1630 * these commands.
1631 */
1632enum nfit_aux_cmds {
1633 NFIT_CMD_TRANSLATE_SPA = 5,
1634 NFIT_CMD_ARS_INJECT_SET = 7,
1635 NFIT_CMD_ARS_INJECT_CLEAR = 8,
1636 NFIT_CMD_ARS_INJECT_GET = 9,
1637};
1638
62232e45
DW		 1639static void acpi_nfit_init_dsms(struct acpi_nfit_desc *acpi_desc)
1640{
1641 struct nvdimm_bus_descriptor *nd_desc = &acpi_desc->nd_desc;
41c8bdb3 1642 const guid_t *guid = to_nfit_uuid(NFIT_DEV_BUS);
62232e45 1643 struct acpi_device *adev;
7db5bb33 1644 unsigned long dsm_mask;
62232e45
DW		 1645 int i;
1646
e3654eca 1647 nd_desc->cmd_mask = acpi_desc->bus_cmd_force_en;
62232e45
DW		 1648 adev = to_acpi_dev(acpi_desc);
1649 if (!adev)
1650 return;
1651
d4f32367 1652 for (i = ND_CMD_ARS_CAP; i <= ND_CMD_CLEAR_ERROR; i++)
94116f81 1653 if (acpi_check_dsm(adev->handle, guid, 1, 1ULL << i))
e3654eca 1654 set_bit(i, &nd_desc->cmd_mask);
37d74841 1655 set_bit(ND_CMD_CALL, &nd_desc->cmd_mask);
7db5bb33
JH		 1656
1657 dsm_mask =
1658 (1 << ND_CMD_ARS_CAP) |
1659 (1 << ND_CMD_ARS_START) |
1660 (1 << ND_CMD_ARS_STATUS) |
1661 (1 << ND_CMD_CLEAR_ERROR) |
1662 (1 << NFIT_CMD_TRANSLATE_SPA) |
1663 (1 << NFIT_CMD_ARS_INJECT_SET) |
1664 (1 << NFIT_CMD_ARS_INJECT_CLEAR) |
1665 (1 << NFIT_CMD_ARS_INJECT_GET);
1666 for_each_set_bit(i, &dsm_mask, BITS_PER_LONG)
1667 if (acpi_check_dsm(adev->handle, guid, 1, 1ULL << i))
1668 set_bit(i, &nd_desc->bus_dsm_mask);
62232e45
DW		 1669}
1670
1f7df6f8
DW		 1671static ssize_t range_index_show(struct device *dev,
1672 struct device_attribute *attr, char *buf)
1673{
1674 struct nd_region *nd_region = to_nd_region(dev);
1675 struct nfit_spa *nfit_spa = nd_region_provider_data(nd_region);
1676
1677 return sprintf(buf, "%d\n", nfit_spa->spa->range_index);
1678}
1679static DEVICE_ATTR_RO(range_index);
1680
a15797f4
DW		 1681static ssize_t ecc_unit_size_show(struct device *dev,
1682 struct device_attribute *attr, char *buf)
1683{
1684 struct nd_region *nd_region = to_nd_region(dev);
1685 struct nfit_spa *nfit_spa = nd_region_provider_data(nd_region);
1686
1687 return sprintf(buf, "%d\n", nfit_spa->clear_err_unit);
1688}
1689static DEVICE_ATTR_RO(ecc_unit_size);
1690
1f7df6f8
DW		 1691static struct attribute *acpi_nfit_region_attributes[] = {
1692 &dev_attr_range_index.attr,
a15797f4 1693 &dev_attr_ecc_unit_size.attr,
1f7df6f8
DW		 1694 NULL,
1695};
1696
5e93746f 1697static const struct attribute_group acpi_nfit_region_attribute_group = {
1f7df6f8
DW		 1698 .name = "nfit",
1699 .attrs = acpi_nfit_region_attributes,
1700};
1701
1702static const struct attribute_group *acpi_nfit_region_attribute_groups[] = {
1703 &nd_region_attribute_group,
1704 &nd_mapping_attribute_group,
3d88002e 1705 &nd_device_attribute_group,
74ae66c3 1706 &nd_numa_attribute_group,
1f7df6f8
DW		 1707 &acpi_nfit_region_attribute_group,
1708 NULL,
1709};
1710
eaf96153
DW		 1711/* enough info to uniquely specify an interleave set */
1712struct nfit_set_info {
1713 struct nfit_set_info_map {
1714 u64 region_offset;
1715 u32 serial_number;
1716 u32 pad;
1717 } mapping[0];
1718};
1719
c12c48ce
DW		 1720struct nfit_set_info2 {
1721 struct nfit_set_info_map2 {
1722 u64 region_offset;
1723 u32 serial_number;
1724 u16 vendor_id;
1725 u16 manufacturing_date;
1726 u8 manufacturing_location;
1727 u8 reserved[31];
1728 } mapping[0];
1729};
1730
eaf96153
DW		 1731static size_t sizeof_nfit_set_info(int num_mappings)
1732{
1733 return sizeof(struct nfit_set_info)
1734 + num_mappings * sizeof(struct nfit_set_info_map);
1735}
1736
c12c48ce
DW		 1737static size_t sizeof_nfit_set_info2(int num_mappings)
1738{
1739 return sizeof(struct nfit_set_info2)
1740 + num_mappings * sizeof(struct nfit_set_info_map2);
1741}
1742
86ef58a4 1743static int cmp_map_compat(const void *m0, const void *m1)
eaf96153
DW		 1744{
1745 const struct nfit_set_info_map *map0 = m0;
1746 const struct nfit_set_info_map *map1 = m1;
1747
1748 return memcmp(&map0->region_offset, &map1->region_offset,
1749 sizeof(u64));
1750}
1751
86ef58a4
DW		 1752static int cmp_map(const void *m0, const void *m1)
1753{
1754 const struct nfit_set_info_map *map0 = m0;
1755 const struct nfit_set_info_map *map1 = m1;
1756
b03b99a3
DW		 1757 if (map0->region_offset < map1->region_offset)
1758 return -1;
1759 else if (map0->region_offset > map1->region_offset)
1760 return 1;
1761 return 0;
86ef58a4
DW		 1762}
1763
c12c48ce
DW		 1764static int cmp_map2(const void *m0, const void *m1)
1765{
1766 const struct nfit_set_info_map2 *map0 = m0;
1767 const struct nfit_set_info_map2 *map1 = m1;
1768
1769 if (map0->region_offset < map1->region_offset)
1770 return -1;
1771 else if (map0->region_offset > map1->region_offset)
1772 return 1;
1773 return 0;
1774}
1775
eaf96153
DW		 1776/* Retrieve the nth entry referencing this spa */
1777static struct acpi_nfit_memory_map *memdev_from_spa(
1778 struct acpi_nfit_desc *acpi_desc, u16 range_index, int n)
1779{
1780 struct nfit_memdev *nfit_memdev;
1781
1782 list_for_each_entry(nfit_memdev, &acpi_desc->memdevs, list)
1783 if (nfit_memdev->memdev->range_index == range_index)
1784 if (n-- == 0)
1785 return nfit_memdev->memdev;
1786 return NULL;
1787}
1788
1789static int acpi_nfit_init_interleave_set(struct acpi_nfit_desc *acpi_desc,
1790 struct nd_region_desc *ndr_desc,
1791 struct acpi_nfit_system_address *spa)
1792{
eaf96153
DW		 1793 struct device *dev = acpi_desc->dev;
1794 struct nd_interleave_set *nd_set;
1795 u16 nr = ndr_desc->num_mappings;
c12c48ce 1796 struct nfit_set_info2 *info2;
eaf96153 1797 struct nfit_set_info *info;
8f2bc243 1798 int i;
eaf96153 1799
faec6f8a
DW		 1800 nd_set = devm_kzalloc(dev, sizeof(*nd_set), GFP_KERNEL);
1801 if (!nd_set)
1802 return -ENOMEM;
1803 ndr_desc->nd_set = nd_set;
1804 guid_copy(&nd_set->type_guid, (guid_t *) spa->range_guid);
1805
eaf96153
DW		 1806 info = devm_kzalloc(dev, sizeof_nfit_set_info(nr), GFP_KERNEL);
1807 if (!info)
1808 return -ENOMEM;
c12c48ce
DW		 1809
1810 info2 = devm_kzalloc(dev, sizeof_nfit_set_info2(nr), GFP_KERNEL);
1811 if (!info2)
1812 return -ENOMEM;
1813
eaf96153 1814 for (i = 0; i < nr; i++) {
44c462eb 1815 struct nd_mapping_desc *mapping = &ndr_desc->mapping[i];
eaf96153 1816 struct nfit_set_info_map *map = &info->mapping[i];
c12c48ce 1817 struct nfit_set_info_map2 *map2 = &info2->mapping[i];
44c462eb 1818 struct nvdimm *nvdimm = mapping->nvdimm;
eaf96153
DW		 1819 struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
1820 struct acpi_nfit_memory_map *memdev = memdev_from_spa(acpi_desc,
1821 spa->range_index, i);
dcb79b15 1822 struct acpi_nfit_control_region *dcr = nfit_mem->dcr;
eaf96153
DW		 1823
1824 if (!memdev || !nfit_mem->dcr) {
1825 dev_err(dev, "%s: failed to find DCR\n", __func__);
1826 return -ENODEV;
1827 }
1828
1829 map->region_offset = memdev->region_offset;
dcb79b15 1830 map->serial_number = dcr->serial_number;
c12c48ce
DW		 1831
1832 map2->region_offset = memdev->region_offset;
dcb79b15
DW		 1833 map2->serial_number = dcr->serial_number;
1834 map2->vendor_id = dcr->vendor_id;
1835 map2->manufacturing_date = dcr->manufacturing_date;
1836 map2->manufacturing_location = dcr->manufacturing_location;
eaf96153
DW		 1837 }
1838
c12c48ce 1839 /* v1.1 namespaces */
eaf96153
DW		 1840 sort(&info->mapping[0], nr, sizeof(struct nfit_set_info_map),
1841 cmp_map, NULL);
c12c48ce
DW		 1842 nd_set->cookie1 = nd_fletcher64(info, sizeof_nfit_set_info(nr), 0);
1843
1844 /* v1.2 namespaces */
1845 sort(&info2->mapping[0], nr, sizeof(struct nfit_set_info_map2),
1846 cmp_map2, NULL);
1847 nd_set->cookie2 = nd_fletcher64(info2, sizeof_nfit_set_info2(nr), 0);
86ef58a4 1848
c12c48ce 1849 /* support v1.1 namespaces created with the wrong sort order */
86ef58a4
DW		 1850 sort(&info->mapping[0], nr, sizeof(struct nfit_set_info_map),
1851 cmp_map_compat, NULL);
1852 nd_set->altcookie = nd_fletcher64(info, sizeof_nfit_set_info(nr), 0);
1853
401c0a19
DW		 1854 /* record the result of the sort for the mapping position */
1855 for (i = 0; i < nr; i++) {
1856 struct nfit_set_info_map2 *map2 = &info2->mapping[i];
1857 int j;
1858
1859 for (j = 0; j < nr; j++) {
1860 struct nd_mapping_desc *mapping = &ndr_desc->mapping[j];
1861 struct nvdimm *nvdimm = mapping->nvdimm;
1862 struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
dcb79b15 1863 struct acpi_nfit_control_region *dcr = nfit_mem->dcr;
401c0a19 1864
dcb79b15
DW		 1865 if (map2->serial_number == dcr->serial_number &&
1866 map2->vendor_id == dcr->vendor_id &&
1867 map2->manufacturing_date == dcr->manufacturing_date &&
401c0a19 1868 map2->manufacturing_location
dcb79b15 1869 == dcr->manufacturing_location) {
401c0a19
DW		 1870 mapping->position = i;
1871 break;
1872 }
1873 }
1874 }
1875
eaf96153
DW		 1876 ndr_desc->nd_set = nd_set;
1877 devm_kfree(dev, info);
c12c48ce 1878 devm_kfree(dev, info2);
eaf96153
DW		 1879
1880 return 0;
1881}
1882
047fc8a1
RZ		 1883static u64 to_interleave_offset(u64 offset, struct nfit_blk_mmio *mmio)
1884{
1885 struct acpi_nfit_interleave *idt = mmio->idt;
1886 u32 sub_line_offset, line_index, line_offset;
1887 u64 line_no, table_skip_count, table_offset;
1888
1889 line_no = div_u64_rem(offset, mmio->line_size, &sub_line_offset);
1890 table_skip_count = div_u64_rem(line_no, mmio->num_lines, &line_index);
1891 line_offset = idt->line_offset[line_index]
1892 * mmio->line_size;
1893 table_offset = table_skip_count * mmio->table_size;
1894
1895 return mmio->base_offset + line_offset + table_offset + sub_line_offset;
1896}
1897
de4a196c 1898static u32 read_blk_stat(struct nfit_blk *nfit_blk, unsigned int bw)
047fc8a1
RZ		 1899{
1900 struct nfit_blk_mmio *mmio = &nfit_blk->mmio[DCR];
1901 u64 offset = nfit_blk->stat_offset + mmio->size * bw;
68202c9f 1902 const u32 STATUS_MASK = 0x80000037;
047fc8a1
RZ		 1903
1904 if (mmio->num_lines)
1905 offset = to_interleave_offset(offset, mmio);
1906
68202c9f 1907 return readl(mmio->addr.base + offset) & STATUS_MASK;
047fc8a1
RZ		 1908}
1909
1910static void write_blk_ctl(struct nfit_blk *nfit_blk, unsigned int bw,
1911 resource_size_t dpa, unsigned int len, unsigned int write)
1912{
1913 u64 cmd, offset;
1914 struct nfit_blk_mmio *mmio = &nfit_blk->mmio[DCR];
1915
1916 enum {
1917 BCW_OFFSET_MASK = (1ULL << 48)-1,
1918 BCW_LEN_SHIFT = 48,
1919 BCW_LEN_MASK = (1ULL << 8) - 1,
1920 BCW_CMD_SHIFT = 56,
1921 };
1922
1923 cmd = (dpa >> L1_CACHE_SHIFT) & BCW_OFFSET_MASK;
1924 len = len >> L1_CACHE_SHIFT;
1925 cmd |= ((u64) len & BCW_LEN_MASK) << BCW_LEN_SHIFT;
1926 cmd |= ((u64) write) << BCW_CMD_SHIFT;
1927
1928 offset = nfit_blk->cmd_offset + mmio->size * bw;
1929 if (mmio->num_lines)
1930 offset = to_interleave_offset(offset, mmio);
1931
67a3e8fe 1932 writeq(cmd, mmio->addr.base + offset);
f284a4f2 1933 nvdimm_flush(nfit_blk->nd_region);
f0f2c072 1934
aef25338 1935 if (nfit_blk->dimm_flags & NFIT_BLK_DCR_LATCH)
67a3e8fe 1936 readq(mmio->addr.base + offset);
047fc8a1
RZ		 1937}
1938
1939static int acpi_nfit_blk_single_io(struct nfit_blk *nfit_blk,
1940 resource_size_t dpa, void *iobuf, size_t len, int rw,
1941 unsigned int lane)
1942{
1943 struct nfit_blk_mmio *mmio = &nfit_blk->mmio[BDW];
1944 unsigned int copied = 0;
1945 u64 base_offset;
1946 int rc;
1947
1948 base_offset = nfit_blk->bdw_offset + dpa % L1_CACHE_BYTES
1949 + lane * mmio->size;
047fc8a1
RZ		 1950 write_blk_ctl(nfit_blk, lane, dpa, len, rw);
1951 while (len) {
1952 unsigned int c;
1953 u64 offset;
1954
1955 if (mmio->num_lines) {
1956 u32 line_offset;
1957
1958 offset = to_interleave_offset(base_offset + copied,
1959 mmio);
1960 div_u64_rem(offset, mmio->line_size, &line_offset);
1961 c = min_t(size_t, len, mmio->line_size - line_offset);
1962 } else {
1963 offset = base_offset + nfit_blk->bdw_offset;
1964 c = len;
1965 }
1966
1967 if (rw)
0aed55af 1968 memcpy_flushcache(mmio->addr.aperture + offset, iobuf + copied, c);
67a3e8fe 1969 else {
aef25338 1970 if (nfit_blk->dimm_flags & NFIT_BLK_READ_FLUSH)
5deb67f7 1971 arch_invalidate_pmem((void __force *)
67a3e8fe
RZ		 1972 mmio->addr.aperture + offset, c);
1973
6abccd1b 1974 memcpy(iobuf + copied, mmio->addr.aperture + offset, c);
67a3e8fe 1975 }
047fc8a1
RZ		 1976
1977 copied += c;
1978 len -= c;
1979 }
c2ad2954
RZ		 1980
1981 if (rw)
f284a4f2 1982 nvdimm_flush(nfit_blk->nd_region);
c2ad2954 1983
047fc8a1
RZ		 1984 rc = read_blk_stat(nfit_blk, lane) ? -EIO : 0;
1985 return rc;
1986}
1987
1988static int acpi_nfit_blk_region_do_io(struct nd_blk_region *ndbr,
1989 resource_size_t dpa, void *iobuf, u64 len, int rw)
1990{
1991 struct nfit_blk *nfit_blk = nd_blk_region_provider_data(ndbr);
1992 struct nfit_blk_mmio *mmio = &nfit_blk->mmio[BDW];
1993 struct nd_region *nd_region = nfit_blk->nd_region;
1994 unsigned int lane, copied = 0;
1995 int rc = 0;
1996
1997 lane = nd_region_acquire_lane(nd_region);
1998 while (len) {
1999 u64 c = min(len, mmio->size);
2000
2001 rc = acpi_nfit_blk_single_io(nfit_blk, dpa + copied,
2002 iobuf + copied, c, rw, lane);
2003 if (rc)
2004 break;
2005
2006 copied += c;
2007 len -= c;
2008 }
2009 nd_region_release_lane(nd_region, lane);
2010
2011 return rc;
2012}
2013
047fc8a1
RZ		 2014static int nfit_blk_init_interleave(struct nfit_blk_mmio *mmio,
2015 struct acpi_nfit_interleave *idt, u16 interleave_ways)
2016{
2017 if (idt) {
2018 mmio->num_lines = idt->line_count;
2019 mmio->line_size = idt->line_size;
2020 if (interleave_ways == 0)
2021 return -ENXIO;
2022 mmio->table_size = mmio->num_lines * interleave_ways
2023 * mmio->line_size;
2024 }
2025
2026 return 0;
2027}
2028
f0f2c072
RZ		 2029static int acpi_nfit_blk_get_flags(struct nvdimm_bus_descriptor *nd_desc,
2030 struct nvdimm *nvdimm, struct nfit_blk *nfit_blk)
2031{
2032 struct nd_cmd_dimm_flags flags;
2033 int rc;
2034
2035 memset(&flags, 0, sizeof(flags));
2036 rc = nd_desc->ndctl(nd_desc, nvdimm, ND_CMD_DIMM_FLAGS, &flags,
aef25338 2037 sizeof(flags), NULL);
f0f2c072
RZ		 2038
2039 if (rc >= 0 && flags.status == 0)
2040 nfit_blk->dimm_flags = flags.flags;
2041 else if (rc == -ENOTTY) {
2042 /* fall back to a conservative default */
aef25338 2043 nfit_blk->dimm_flags = NFIT_BLK_DCR_LATCH | NFIT_BLK_READ_FLUSH;
f0f2c072
RZ		 2044 rc = 0;
2045 } else
2046 rc = -ENXIO;
2047
2048 return rc;
2049}
2050
047fc8a1
RZ		 2051static int acpi_nfit_blk_region_enable(struct nvdimm_bus *nvdimm_bus,
2052 struct device *dev)
2053{
2054 struct nvdimm_bus_descriptor *nd_desc = to_nd_desc(nvdimm_bus);
047fc8a1
RZ		 2055 struct nd_blk_region *ndbr = to_nd_blk_region(dev);
2056 struct nfit_blk_mmio *mmio;
2057 struct nfit_blk *nfit_blk;
2058 struct nfit_mem *nfit_mem;
2059 struct nvdimm *nvdimm;
2060 int rc;
2061
2062 nvdimm = nd_blk_region_to_dimm(ndbr);
2063 nfit_mem = nvdimm_provider_data(nvdimm);
2064 if (!nfit_mem || !nfit_mem->dcr || !nfit_mem->bdw) {
2065 dev_dbg(dev, "%s: missing%s%s%s\n", __func__,
2066 nfit_mem ? "" : " nfit_mem",
193ccca4
DW		 2067 (nfit_mem && nfit_mem->dcr) ? "" : " dcr",
2068 (nfit_mem && nfit_mem->bdw) ? "" : " bdw");
047fc8a1
RZ		 2069 return -ENXIO;
2070 }
2071
2072 nfit_blk = devm_kzalloc(dev, sizeof(*nfit_blk), GFP_KERNEL);
2073 if (!nfit_blk)
2074 return -ENOMEM;
2075 nd_blk_region_set_provider_data(ndbr, nfit_blk);
2076 nfit_blk->nd_region = to_nd_region(dev);
2077
2078 /* map block aperture memory */
2079 nfit_blk->bdw_offset = nfit_mem->bdw->offset;
2080 mmio = &nfit_blk->mmio[BDW];
29b9aa0a 2081 mmio->addr.base = devm_nvdimm_memremap(dev, nfit_mem->spa_bdw->address,
ca6a4657 2082 nfit_mem->spa_bdw->length, nd_blk_memremap_flags(ndbr));
67a3e8fe 2083 if (!mmio->addr.base) {
047fc8a1
RZ		 2084 dev_dbg(dev, "%s: %s failed to map bdw\n", __func__,
2085 nvdimm_name(nvdimm));
2086 return -ENOMEM;
2087 }
2088 mmio->size = nfit_mem->bdw->size;
2089 mmio->base_offset = nfit_mem->memdev_bdw->region_offset;
2090 mmio->idt = nfit_mem->idt_bdw;
2091 mmio->spa = nfit_mem->spa_bdw;
2092 rc = nfit_blk_init_interleave(mmio, nfit_mem->idt_bdw,
2093 nfit_mem->memdev_bdw->interleave_ways);
2094 if (rc) {
2095 dev_dbg(dev, "%s: %s failed to init bdw interleave\n",
2096 __func__, nvdimm_name(nvdimm));
2097 return rc;
2098 }
2099
2100 /* map block control memory */
2101 nfit_blk->cmd_offset = nfit_mem->dcr->command_offset;
2102 nfit_blk->stat_offset = nfit_mem->dcr->status_offset;
2103 mmio = &nfit_blk->mmio[DCR];
29b9aa0a
DW		 2104 mmio->addr.base = devm_nvdimm_ioremap(dev, nfit_mem->spa_dcr->address,
2105 nfit_mem->spa_dcr->length);
67a3e8fe 2106 if (!mmio->addr.base) {
047fc8a1
RZ		 2107 dev_dbg(dev, "%s: %s failed to map dcr\n", __func__,
2108 nvdimm_name(nvdimm));
2109 return -ENOMEM;
2110 }
2111 mmio->size = nfit_mem->dcr->window_size;
2112 mmio->base_offset = nfit_mem->memdev_dcr->region_offset;
2113 mmio->idt = nfit_mem->idt_dcr;
2114 mmio->spa = nfit_mem->spa_dcr;
2115 rc = nfit_blk_init_interleave(mmio, nfit_mem->idt_dcr,
2116 nfit_mem->memdev_dcr->interleave_ways);
2117 if (rc) {
2118 dev_dbg(dev, "%s: %s failed to init dcr interleave\n",
2119 __func__, nvdimm_name(nvdimm));
2120 return rc;
2121 }
2122
f0f2c072
RZ		 2123 rc = acpi_nfit_blk_get_flags(nd_desc, nvdimm, nfit_blk);
2124 if (rc < 0) {
2125 dev_dbg(dev, "%s: %s failed get DIMM flags\n",
2126 __func__, nvdimm_name(nvdimm));
2127 return rc;
2128 }
2129
f284a4f2 2130 if (nvdimm_has_flush(nfit_blk->nd_region) < 0)
c2ad2954
RZ		 2131 dev_warn(dev, "unable to guarantee persistence of writes\n");
2132
047fc8a1
RZ		 2133 if (mmio->line_size == 0)
2134 return 0;
2135
2136 if ((u32) nfit_blk->cmd_offset % mmio->line_size
2137 + 8 > mmio->line_size) {
2138 dev_dbg(dev, "cmd_offset crosses interleave boundary\n");
2139 return -ENXIO;
2140 } else if ((u32) nfit_blk->stat_offset % mmio->line_size
2141 + 8 > mmio->line_size) {
2142 dev_dbg(dev, "stat_offset crosses interleave boundary\n");
2143 return -ENXIO;
2144 }
2145
2146 return 0;
2147}
2148
aef25338 2149static int ars_get_cap(struct acpi_nfit_desc *acpi_desc,
1cf03c00 2150 struct nd_cmd_ars_cap *cmd, struct nfit_spa *nfit_spa)
0caeef63 2151{
aef25338 2152 struct nvdimm_bus_descriptor *nd_desc = &acpi_desc->nd_desc;
1cf03c00 2153 struct acpi_nfit_system_address *spa = nfit_spa->spa;
aef25338
DW		 2154 int cmd_rc, rc;
2155
1cf03c00
DW		 2156 cmd->address = spa->address;
2157 cmd->length = spa->length;
aef25338
DW		 2158 rc = nd_desc->ndctl(nd_desc, NULL, ND_CMD_ARS_CAP, cmd,
2159 sizeof(*cmd), &cmd_rc);
2160 if (rc < 0)
2161 return rc;
1cf03c00 2162 return cmd_rc;
0caeef63
VV		 2163}
2164
1cf03c00 2165static int ars_start(struct acpi_nfit_desc *acpi_desc, struct nfit_spa *nfit_spa)
0caeef63
VV		 2166{
2167 int rc;
1cf03c00
DW		 2168 int cmd_rc;
2169 struct nd_cmd_ars_start ars_start;
2170 struct acpi_nfit_system_address *spa = nfit_spa->spa;
2171 struct nvdimm_bus_descriptor *nd_desc = &acpi_desc->nd_desc;
0caeef63 2172
1cf03c00
DW		 2173 memset(&ars_start, 0, sizeof(ars_start));
2174 ars_start.address = spa->address;
2175 ars_start.length = spa->length;
80790039 2176 ars_start.flags = acpi_desc->ars_start_flags;
1cf03c00
DW		 2177 if (nfit_spa_type(spa) == NFIT_SPA_PM)
2178 ars_start.type = ND_ARS_PERSISTENT;
2179 else if (nfit_spa_type(spa) == NFIT_SPA_VOLATILE)
2180 ars_start.type = ND_ARS_VOLATILE;
2181 else
2182 return -ENOTTY;
aef25338 2183
1cf03c00
DW		 2184 rc = nd_desc->ndctl(nd_desc, NULL, ND_CMD_ARS_START, &ars_start,
2185 sizeof(ars_start), &cmd_rc);
aef25338 2186
1cf03c00
DW		 2187 if (rc < 0)
2188 return rc;
2189 return cmd_rc;
0caeef63
VV		 2190}
2191
1cf03c00 2192static int ars_continue(struct acpi_nfit_desc *acpi_desc)
0caeef63 2193{
aef25338 2194 int rc, cmd_rc;
1cf03c00
DW		 2195 struct nd_cmd_ars_start ars_start;
2196 struct nvdimm_bus_descriptor *nd_desc = &acpi_desc->nd_desc;
2197 struct nd_cmd_ars_status *ars_status = acpi_desc->ars_status;
2198
2199 memset(&ars_start, 0, sizeof(ars_start));
2200 ars_start.address = ars_status->restart_address;
2201 ars_start.length = ars_status->restart_length;
2202 ars_start.type = ars_status->type;
80790039 2203 ars_start.flags = acpi_desc->ars_start_flags;
1cf03c00
DW		 2204 rc = nd_desc->ndctl(nd_desc, NULL, ND_CMD_ARS_START, &ars_start,
2205 sizeof(ars_start), &cmd_rc);
2206 if (rc < 0)
2207 return rc;
2208 return cmd_rc;
2209}
0caeef63 2210
1cf03c00
DW		 2211static int ars_get_status(struct acpi_nfit_desc *acpi_desc)
2212{
2213 struct nvdimm_bus_descriptor *nd_desc = &acpi_desc->nd_desc;
2214 struct nd_cmd_ars_status *ars_status = acpi_desc->ars_status;
2215 int rc, cmd_rc;
aef25338 2216
1cf03c00
DW		 2217 rc = nd_desc->ndctl(nd_desc, NULL, ND_CMD_ARS_STATUS, ars_status,
2218 acpi_desc->ars_status_size, &cmd_rc);
2219 if (rc < 0)
2220 return rc;
2221 return cmd_rc;
0caeef63
VV		 2222}
2223
82aa37cf 2224static int ars_status_process_records(struct acpi_nfit_desc *acpi_desc,
1cf03c00 2225 struct nd_cmd_ars_status *ars_status)
0caeef63 2226{
82aa37cf 2227 struct nvdimm_bus *nvdimm_bus = acpi_desc->nvdimm_bus;
0caeef63
VV		 2228 int rc;
2229 u32 i;
2230
82aa37cf
DW		 2231 /*
2232 * First record starts at 44 byte offset from the start of the
2233 * payload.
2234 */
2235 if (ars_status->out_length < 44)
2236 return 0;
0caeef63 2237 for (i = 0; i < ars_status->num_records; i++) {
82aa37cf
DW		 2238 /* only process full records */
2239 if (ars_status->out_length
2240 < 44 + sizeof(struct nd_ars_record) * (i + 1))
2241 break;
0caeef63
VV		 2242 rc = nvdimm_bus_add_poison(nvdimm_bus,
2243 ars_status->records[i].err_address,
2244 ars_status->records[i].length);
2245 if (rc)
2246 return rc;
2247 }
82aa37cf
DW		 2248 if (i < ars_status->num_records)
2249 dev_warn(acpi_desc->dev, "detected truncated ars results\n");
0caeef63
VV		 2250
2251 return 0;
2252}
2253
af1996ef
TK		 2254static void acpi_nfit_remove_resource(void *data)
2255{
2256 struct resource *res = data;
2257
2258 remove_resource(res);
2259}
2260
2261static int acpi_nfit_insert_resource(struct acpi_nfit_desc *acpi_desc,
2262 struct nd_region_desc *ndr_desc)
2263{
2264 struct resource *res, *nd_res = ndr_desc->res;
2265 int is_pmem, ret;
2266
2267 /* No operation if the region is already registered as PMEM */
2268 is_pmem = region_intersects(nd_res->start, resource_size(nd_res),
2269 IORESOURCE_MEM, IORES_DESC_PERSISTENT_MEMORY);
2270 if (is_pmem == REGION_INTERSECTS)
2271 return 0;
2272
2273 res = devm_kzalloc(acpi_desc->dev, sizeof(*res), GFP_KERNEL);
2274 if (!res)
2275 return -ENOMEM;
2276
2277 res->name = "Persistent Memory";
2278 res->start = nd_res->start;
2279 res->end = nd_res->end;
2280 res->flags = IORESOURCE_MEM;
2281 res->desc = IORES_DESC_PERSISTENT_MEMORY;
2282
2283 ret = insert_resource(&iomem_resource, res);
2284 if (ret)
2285 return ret;
2286
d932dd2c
SV		 2287 ret = devm_add_action_or_reset(acpi_desc->dev,
2288 acpi_nfit_remove_resource,
2289 res);
2290 if (ret)
af1996ef 2291 return ret;
af1996ef
TK		 2292
2293 return 0;
2294}
2295
1f7df6f8 2296static int acpi_nfit_init_mapping(struct acpi_nfit_desc *acpi_desc,
44c462eb 2297 struct nd_mapping_desc *mapping, struct nd_region_desc *ndr_desc,
1f7df6f8 2298 struct acpi_nfit_memory_map *memdev,
1cf03c00 2299 struct nfit_spa *nfit_spa)
1f7df6f8
DW		 2300{
2301 struct nvdimm *nvdimm = acpi_nfit_dimm_by_handle(acpi_desc,
2302 memdev->device_handle);
1cf03c00 2303 struct acpi_nfit_system_address *spa = nfit_spa->spa;
047fc8a1 2304 struct nd_blk_region_desc *ndbr_desc;
1f7df6f8 2305 struct nfit_mem *nfit_mem;
faec6f8a 2306 int blk_valid = 0, rc;
1f7df6f8
DW		 2307
2308 if (!nvdimm) {
2309 dev_err(acpi_desc->dev, "spa%d dimm: %#x not found\n",
2310 spa->range_index, memdev->device_handle);
2311 return -ENODEV;
2312 }
2313
44c462eb 2314 mapping->nvdimm = nvdimm;
1f7df6f8
DW		 2315 switch (nfit_spa_type(spa)) {
2316 case NFIT_SPA_PM:
2317 case NFIT_SPA_VOLATILE:
44c462eb
DW		 2318 mapping->start = memdev->address;
2319 mapping->size = memdev->region_size;
1f7df6f8
DW		 2320 break;
2321 case NFIT_SPA_DCR:
2322 nfit_mem = nvdimm_provider_data(nvdimm);
2323 if (!nfit_mem || !nfit_mem->bdw) {
2324 dev_dbg(acpi_desc->dev, "spa%d %s missing bdw\n",
2325 spa->range_index, nvdimm_name(nvdimm));
2326 } else {
44c462eb
DW		 2327 mapping->size = nfit_mem->bdw->capacity;
2328 mapping->start = nfit_mem->bdw->start_address;
5212e11f 2329 ndr_desc->num_lanes = nfit_mem->bdw->windows;
1f7df6f8
DW		 2330 blk_valid = 1;
2331 }
2332
44c462eb 2333 ndr_desc->mapping = mapping;
1f7df6f8 2334 ndr_desc->num_mappings = blk_valid;
047fc8a1
RZ		 2335 ndbr_desc = to_blk_region_desc(ndr_desc);
2336 ndbr_desc->enable = acpi_nfit_blk_region_enable;
6bc75619 2337 ndbr_desc->do_io = acpi_desc->blk_do_io;
faec6f8a
DW		 2338 rc = acpi_nfit_init_interleave_set(acpi_desc, ndr_desc, spa);
2339 if (rc)
2340 return rc;
1cf03c00
DW		 2341 nfit_spa->nd_region = nvdimm_blk_region_create(acpi_desc->nvdimm_bus,
2342 ndr_desc);
2343 if (!nfit_spa->nd_region)
1f7df6f8
DW		 2344 return -ENOMEM;
2345 break;
2346 }
2347
2348 return 0;
2349}
2350
c2f32acd
LCY		 2351static bool nfit_spa_is_virtual(struct acpi_nfit_system_address *spa)
2352{
2353 return (nfit_spa_type(spa) == NFIT_SPA_VDISK ||
2354 nfit_spa_type(spa) == NFIT_SPA_VCD ||
2355 nfit_spa_type(spa) == NFIT_SPA_PDISK ||
2356 nfit_spa_type(spa) == NFIT_SPA_PCD);
2357}
2358
c9e582aa
DW		 2359static bool nfit_spa_is_volatile(struct acpi_nfit_system_address *spa)
2360{
2361 return (nfit_spa_type(spa) == NFIT_SPA_VDISK ||
2362 nfit_spa_type(spa) == NFIT_SPA_VCD ||
2363 nfit_spa_type(spa) == NFIT_SPA_VOLATILE);
2364}
2365
1f7df6f8
DW		 2366static int acpi_nfit_register_region(struct acpi_nfit_desc *acpi_desc,
2367 struct nfit_spa *nfit_spa)
2368{
44c462eb 2369 static struct nd_mapping_desc mappings[ND_MAX_MAPPINGS];
1f7df6f8 2370 struct acpi_nfit_system_address *spa = nfit_spa->spa;
047fc8a1
RZ		 2371 struct nd_blk_region_desc ndbr_desc;
2372 struct nd_region_desc *ndr_desc;
1f7df6f8 2373 struct nfit_memdev *nfit_memdev;
1f7df6f8
DW		 2374 struct nvdimm_bus *nvdimm_bus;
2375 struct resource res;
eaf96153 2376 int count = 0, rc;
1f7df6f8 2377
1cf03c00 2378 if (nfit_spa->nd_region)
20985164
VV		 2379 return 0;
2380
c2f32acd 2381 if (spa->range_index == 0 && !nfit_spa_is_virtual(spa)) {
1f7df6f8
DW		 2382 dev_dbg(acpi_desc->dev, "%s: detected invalid spa index\n",
2383 __func__);
2384 return 0;
2385 }
2386
2387 memset(&res, 0, sizeof(res));
44c462eb 2388 memset(&mappings, 0, sizeof(mappings));
047fc8a1 2389 memset(&ndbr_desc, 0, sizeof(ndbr_desc));
1f7df6f8
DW		 2390 res.start = spa->address;
2391 res.end = res.start + spa->length - 1;
047fc8a1
RZ		 2392 ndr_desc = &ndbr_desc.ndr_desc;
2393 ndr_desc->res = &res;
2394 ndr_desc->provider_data = nfit_spa;
2395 ndr_desc->attr_groups = acpi_nfit_region_attribute_groups;
41d7a6d6
TK		 2396 if (spa->flags & ACPI_NFIT_PROXIMITY_VALID)
2397 ndr_desc->numa_node = acpi_map_pxm_to_online_node(
2398 spa->proximity_domain);
2399 else
2400 ndr_desc->numa_node = NUMA_NO_NODE;
2401
1f7df6f8
DW		 2402 list_for_each_entry(nfit_memdev, &acpi_desc->memdevs, list) {
2403 struct acpi_nfit_memory_map *memdev = nfit_memdev->memdev;
44c462eb 2404 struct nd_mapping_desc *mapping;
1f7df6f8
DW		 2405
2406 if (memdev->range_index != spa->range_index)
2407 continue;
2408 if (count >= ND_MAX_MAPPINGS) {
2409 dev_err(acpi_desc->dev, "spa%d exceeds max mappings %d\n",
2410 spa->range_index, ND_MAX_MAPPINGS);
2411 return -ENXIO;
2412 }
44c462eb
DW		 2413 mapping = &mappings[count++];
2414 rc = acpi_nfit_init_mapping(acpi_desc, mapping, ndr_desc,
1cf03c00 2415 memdev, nfit_spa);
1f7df6f8 2416 if (rc)
1cf03c00 2417 goto out;
1f7df6f8
DW		 2418 }
2419
44c462eb 2420 ndr_desc->mapping = mappings;
047fc8a1
RZ		 2421 ndr_desc->num_mappings = count;
2422 rc = acpi_nfit_init_interleave_set(acpi_desc, ndr_desc, spa);
eaf96153 2423 if (rc)
1cf03c00 2424 goto out;
eaf96153 2425
1f7df6f8
DW		 2426 nvdimm_bus = acpi_desc->nvdimm_bus;
2427 if (nfit_spa_type(spa) == NFIT_SPA_PM) {
af1996ef 2428 rc = acpi_nfit_insert_resource(acpi_desc, ndr_desc);
48901165 2429 if (rc) {
af1996ef
TK		 2430 dev_warn(acpi_desc->dev,
2431 "failed to insert pmem resource to iomem: %d\n",
2432 rc);
48901165 2433 goto out;
0caeef63 2434 }
48901165 2435
1cf03c00
DW		 2436 nfit_spa->nd_region = nvdimm_pmem_region_create(nvdimm_bus,
2437 ndr_desc);
2438 if (!nfit_spa->nd_region)
2439 rc = -ENOMEM;
c9e582aa 2440 } else if (nfit_spa_is_volatile(spa)) {
1cf03c00
DW		 2441 nfit_spa->nd_region = nvdimm_volatile_region_create(nvdimm_bus,
2442 ndr_desc);
2443 if (!nfit_spa->nd_region)
2444 rc = -ENOMEM;
c2f32acd
LCY		 2445 } else if (nfit_spa_is_virtual(spa)) {
2446 nfit_spa->nd_region = nvdimm_pmem_region_create(nvdimm_bus,
2447 ndr_desc);
2448 if (!nfit_spa->nd_region)
2449 rc = -ENOMEM;
1f7df6f8 2450 }
20985164 2451
1cf03c00
DW		 2452 out:
2453 if (rc)
2454 dev_err(acpi_desc->dev, "failed to register spa range %d\n",
2455 nfit_spa->spa->range_index);
2456 return rc;
2457}
2458
2459static int ars_status_alloc(struct acpi_nfit_desc *acpi_desc,
2460 u32 max_ars)
2461{
2462 struct device *dev = acpi_desc->dev;
2463 struct nd_cmd_ars_status *ars_status;
2464
2465 if (acpi_desc->ars_status && acpi_desc->ars_status_size >= max_ars) {
2466 memset(acpi_desc->ars_status, 0, acpi_desc->ars_status_size);
2467 return 0;
2468 }
2469
2470 if (acpi_desc->ars_status)
2471 devm_kfree(dev, acpi_desc->ars_status);
2472 acpi_desc->ars_status = NULL;
2473 ars_status = devm_kzalloc(dev, max_ars, GFP_KERNEL);
2474 if (!ars_status)
2475 return -ENOMEM;
2476 acpi_desc->ars_status = ars_status;
2477 acpi_desc->ars_status_size = max_ars;
1f7df6f8
DW		 2478 return 0;
2479}
2480
1cf03c00
DW		 2481static int acpi_nfit_query_poison(struct acpi_nfit_desc *acpi_desc,
2482 struct nfit_spa *nfit_spa)
2483{
2484 struct acpi_nfit_system_address *spa = nfit_spa->spa;
2485 int rc;
2486
2487 if (!nfit_spa->max_ars) {
2488 struct nd_cmd_ars_cap ars_cap;
2489
2490 memset(&ars_cap, 0, sizeof(ars_cap));
2491 rc = ars_get_cap(acpi_desc, &ars_cap, nfit_spa);
2492 if (rc < 0)
2493 return rc;
2494 nfit_spa->max_ars = ars_cap.max_ars_out;
2495 nfit_spa->clear_err_unit = ars_cap.clear_err_unit;
2496 /* check that the supported scrub types match the spa type */
2497 if (nfit_spa_type(spa) == NFIT_SPA_VOLATILE &&
2498 ((ars_cap.status >> 16) & ND_ARS_VOLATILE) == 0)
2499 return -ENOTTY;
2500 else if (nfit_spa_type(spa) == NFIT_SPA_PM &&
2501 ((ars_cap.status >> 16) & ND_ARS_PERSISTENT) == 0)
2502 return -ENOTTY;
2503 }
2504
2505 if (ars_status_alloc(acpi_desc, nfit_spa->max_ars))
2506 return -ENOMEM;
2507
2508 rc = ars_get_status(acpi_desc);
2509 if (rc < 0 && rc != -ENOSPC)
2510 return rc;
2511
82aa37cf 2512 if (ars_status_process_records(acpi_desc, acpi_desc->ars_status))
1cf03c00
DW		 2513 return -ENOMEM;
2514
2515 return 0;
2516}
2517
2518static void acpi_nfit_async_scrub(struct acpi_nfit_desc *acpi_desc,
2519 struct nfit_spa *nfit_spa)
2520{
2521 struct acpi_nfit_system_address *spa = nfit_spa->spa;
2522 unsigned int overflow_retry = scrub_overflow_abort;
2523 u64 init_ars_start = 0, init_ars_len = 0;
2524 struct device *dev = acpi_desc->dev;
2525 unsigned int tmo = scrub_timeout;
2526 int rc;
2527
37b137ff 2528 if (!nfit_spa->ars_required || !nfit_spa->nd_region)
1cf03c00
DW		 2529 return;
2530
2531 rc = ars_start(acpi_desc, nfit_spa);
2532 /*
2533 * If we timed out the initial scan we'll still be busy here,
2534 * and will wait another timeout before giving up permanently.
2535 */
2536 if (rc < 0 && rc != -EBUSY)
2537 return;
2538
2539 do {
2540 u64 ars_start, ars_len;
2541
2542 if (acpi_desc->cancel)
2543 break;
2544 rc = acpi_nfit_query_poison(acpi_desc, nfit_spa);
2545 if (rc == -ENOTTY)
2546 break;
2547 if (rc == -EBUSY && !tmo) {
2548 dev_warn(dev, "range %d ars timeout, aborting\n",
2549 spa->range_index);
2550 break;
2551 }
2552
2553 if (rc == -EBUSY) {
2554 /*
2555 * Note, entries may be appended to the list
2556 * while the lock is dropped, but the workqueue
2557 * being active prevents entries being deleted /
2558 * freed.
2559 */
2560 mutex_unlock(&acpi_desc->init_mutex);
2561 ssleep(1);
2562 tmo--;
2563 mutex_lock(&acpi_desc->init_mutex);
2564 continue;
2565 }
2566
2567 /* we got some results, but there are more pending... */
2568 if (rc == -ENOSPC && overflow_retry--) {
2569 if (!init_ars_len) {
2570 init_ars_len = acpi_desc->ars_status->length;
2571 init_ars_start = acpi_desc->ars_status->address;
2572 }
2573 rc = ars_continue(acpi_desc);
2574 }
2575
2576 if (rc < 0) {
2577 dev_warn(dev, "range %d ars continuation failed\n",
2578 spa->range_index);
2579 break;
2580 }
2581
2582 if (init_ars_len) {
2583 ars_start = init_ars_start;
2584 ars_len = init_ars_len;
2585 } else {
2586 ars_start = acpi_desc->ars_status->address;
2587 ars_len = acpi_desc->ars_status->length;
2588 }
2589 dev_dbg(dev, "spa range: %d ars from %#llx + %#llx complete\n",
2590 spa->range_index, ars_start, ars_len);
2591 /* notify the region about new poison entries */
2592 nvdimm_region_notify(nfit_spa->nd_region,
2593 NVDIMM_REVALIDATE_POISON);
2594 break;
2595 } while (1);
2596}
2597
2598static void acpi_nfit_scrub(struct work_struct *work)
1f7df6f8 2599{
1cf03c00
DW		 2600 struct device *dev;
2601 u64 init_scrub_length = 0;
1f7df6f8 2602 struct nfit_spa *nfit_spa;
1cf03c00
DW		 2603 u64 init_scrub_address = 0;
2604 bool init_ars_done = false;
2605 struct acpi_nfit_desc *acpi_desc;
2606 unsigned int tmo = scrub_timeout;
2607 unsigned int overflow_retry = scrub_overflow_abort;
2608
2609 acpi_desc = container_of(work, typeof(*acpi_desc), work);
2610 dev = acpi_desc->dev;
1f7df6f8 2611
1cf03c00
DW		 2612 /*
2613 * We scrub in 2 phases. The first phase waits for any platform
2614 * firmware initiated scrubs to complete and then we go search for the
2615 * affected spa regions to mark them scanned. In the second phase we
2616 * initiate a directed scrub for every range that was not scrubbed in
37b137ff
VV		 2617 * phase 1. If we're called for a 'rescan', we harmlessly pass through
2618 * the first phase, but really only care about running phase 2, where
2619 * regions can be notified of new poison.
1cf03c00
DW		 2620 */
2621
2622 /* process platform firmware initiated scrubs */
2623 retry:
2624 mutex_lock(&acpi_desc->init_mutex);
1f7df6f8 2625 list_for_each_entry(nfit_spa, &acpi_desc->spas, list) {
1cf03c00
DW		 2626 struct nd_cmd_ars_status *ars_status;
2627 struct acpi_nfit_system_address *spa;
2628 u64 ars_start, ars_len;
2629 int rc;
1f7df6f8 2630
1cf03c00
DW		 2631 if (acpi_desc->cancel)
2632 break;
2633
2634 if (nfit_spa->nd_region)
2635 continue;
2636
2637 if (init_ars_done) {
2638 /*
2639 * No need to re-query, we're now just
2640 * reconciling all the ranges covered by the
2641 * initial scrub
2642 */
2643 rc = 0;
2644 } else
2645 rc = acpi_nfit_query_poison(acpi_desc, nfit_spa);
2646
2647 if (rc == -ENOTTY) {
2648 /* no ars capability, just register spa and move on */
2649 acpi_nfit_register_region(acpi_desc, nfit_spa);
2650 continue;
2651 }
2652
2653 if (rc == -EBUSY && !tmo) {
2654 /* fallthrough to directed scrub in phase 2 */
2655 dev_warn(dev, "timeout awaiting ars results, continuing...\n");
2656 break;
2657 } else if (rc == -EBUSY) {
2658 mutex_unlock(&acpi_desc->init_mutex);
2659 ssleep(1);
2660 tmo--;
2661 goto retry;
2662 }
2663
2664 /* we got some results, but there are more pending... */
2665 if (rc == -ENOSPC && overflow_retry--) {
2666 ars_status = acpi_desc->ars_status;
2667 /*
2668 * Record the original scrub range, so that we
2669 * can recall all the ranges impacted by the
2670 * initial scrub.
2671 */
2672 if (!init_scrub_length) {
2673 init_scrub_length = ars_status->length;
2674 init_scrub_address = ars_status->address;
2675 }
2676 rc = ars_continue(acpi_desc);
2677 if (rc == 0) {
2678 mutex_unlock(&acpi_desc->init_mutex);
2679 goto retry;
2680 }
2681 }
2682
2683 if (rc < 0) {
2684 /*
2685 * Initial scrub failed, we'll give it one more
2686 * try below...
2687 */
2688 break;
2689 }
2690
2691 /* We got some final results, record completed ranges */
2692 ars_status = acpi_desc->ars_status;
2693 if (init_scrub_length) {
2694 ars_start = init_scrub_address;
2695 ars_len = ars_start + init_scrub_length;
2696 } else {
2697 ars_start = ars_status->address;
2698 ars_len = ars_status->length;
2699 }
2700 spa = nfit_spa->spa;
2701
2702 if (!init_ars_done) {
2703 init_ars_done = true;
2704 dev_dbg(dev, "init scrub %#llx + %#llx complete\n",
2705 ars_start, ars_len);
2706 }
2707 if (ars_start <= spa->address && ars_start + ars_len
2708 >= spa->address + spa->length)
2709 acpi_nfit_register_region(acpi_desc, nfit_spa);
1f7df6f8 2710 }
1cf03c00
DW		 2711
2712 /*
2713 * For all the ranges not covered by an initial scrub we still
2714 * want to see if there are errors, but it's ok to discover them
2715 * asynchronously.
2716 */
2717 list_for_each_entry(nfit_spa, &acpi_desc->spas, list) {
2718 /*
2719 * Flag all the ranges that still need scrubbing, but
2720 * register them now to make data available.
2721 */
37b137ff
VV		 2722 if (!nfit_spa->nd_region) {
2723 nfit_spa->ars_required = 1;
1cf03c00 2724 acpi_nfit_register_region(acpi_desc, nfit_spa);
37b137ff 2725 }
1cf03c00 2726 }
9ccaed4b 2727 acpi_desc->init_complete = 1;
1cf03c00
DW		 2728
2729 list_for_each_entry(nfit_spa, &acpi_desc->spas, list)
2730 acpi_nfit_async_scrub(acpi_desc, nfit_spa);
37b137ff 2731 acpi_desc->scrub_count++;
80790039 2732 acpi_desc->ars_start_flags = 0;
37b137ff
VV		 2733 if (acpi_desc->scrub_count_state)
2734 sysfs_notify_dirent(acpi_desc->scrub_count_state);
1cf03c00
DW		 2735 mutex_unlock(&acpi_desc->init_mutex);
2736}
2737
2738static int acpi_nfit_register_regions(struct acpi_nfit_desc *acpi_desc)
2739{
2740 struct nfit_spa *nfit_spa;
2741 int rc;
2742
2743 list_for_each_entry(nfit_spa, &acpi_desc->spas, list)
2744 if (nfit_spa_type(nfit_spa->spa) == NFIT_SPA_DCR) {
2745 /* BLK regions don't need to wait for ars results */
2746 rc = acpi_nfit_register_region(acpi_desc, nfit_spa);
2747 if (rc)
2748 return rc;
2749 }
2750
80790039 2751 acpi_desc->ars_start_flags = 0;
fbabd829
DW		 2752 if (!acpi_desc->cancel)
2753 queue_work(nfit_wq, &acpi_desc->work);
1f7df6f8
DW		 2754 return 0;
2755}
2756
20985164
VV		 2757static int acpi_nfit_check_deletions(struct acpi_nfit_desc *acpi_desc,
2758 struct nfit_table_prev *prev)
2759{
2760 struct device *dev = acpi_desc->dev;
2761
2762 if (!list_empty(&prev->spas) ||
2763 !list_empty(&prev->memdevs) ||
2764 !list_empty(&prev->dcrs) ||
2765 !list_empty(&prev->bdws) ||
2766 !list_empty(&prev->idts) ||
2767 !list_empty(&prev->flushes)) {
2768 dev_err(dev, "new nfit deletes entries (unsupported)\n");
2769 return -ENXIO;
2770 }
2771 return 0;
2772}
2773
37b137ff
VV		 2774static int acpi_nfit_desc_init_scrub_attr(struct acpi_nfit_desc *acpi_desc)
2775{
2776 struct device *dev = acpi_desc->dev;
2777 struct kernfs_node *nfit;
2778 struct device *bus_dev;
2779
2780 if (!ars_supported(acpi_desc->nvdimm_bus))
2781 return 0;
2782
2783 bus_dev = to_nvdimm_bus_dev(acpi_desc->nvdimm_bus);
2784 nfit = sysfs_get_dirent(bus_dev->kobj.sd, "nfit");
2785 if (!nfit) {
2786 dev_err(dev, "sysfs_get_dirent 'nfit' failed\n");
2787 return -ENODEV;
2788 }
2789 acpi_desc->scrub_count_state = sysfs_get_dirent(nfit, "scrub");
2790 sysfs_put(nfit);
2791 if (!acpi_desc->scrub_count_state) {
2792 dev_err(dev, "sysfs_get_dirent 'scrub' failed\n");
2793 return -ENODEV;
2794 }
2795
2796 return 0;
2797}
2798
fbabd829 2799static void acpi_nfit_unregister(void *data)
58cd71b4
DW		 2800{
2801 struct acpi_nfit_desc *acpi_desc = data;
2802
58cd71b4 2803 nvdimm_bus_unregister(acpi_desc->nvdimm_bus);
58cd71b4
DW		 2804}
2805
e7a11b44 2806int acpi_nfit_init(struct acpi_nfit_desc *acpi_desc, void *data, acpi_size sz)
b94d5230
DW		 2807{
2808 struct device *dev = acpi_desc->dev;
20985164 2809 struct nfit_table_prev prev;
b94d5230 2810 const void *end;
1f7df6f8 2811 int rc;
b94d5230 2812
58cd71b4 2813 if (!acpi_desc->nvdimm_bus) {
37b137ff
VV		 2814 acpi_nfit_init_dsms(acpi_desc);
2815
58cd71b4
DW		 2816 acpi_desc->nvdimm_bus = nvdimm_bus_register(dev,
2817 &acpi_desc->nd_desc);
2818 if (!acpi_desc->nvdimm_bus)
2819 return -ENOMEM;
37b137ff 2820
fbabd829 2821 rc = devm_add_action_or_reset(dev, acpi_nfit_unregister,
58cd71b4
DW		 2822 acpi_desc);
2823 if (rc)
2824 return rc;
37b137ff
VV		 2825
2826 rc = acpi_nfit_desc_init_scrub_attr(acpi_desc);
2827 if (rc)
2828 return rc;
6839a6d9
VV		 2829
2830 /* register this acpi_desc for mce notifications */
2831 mutex_lock(&acpi_desc_lock);
2832 list_add_tail(&acpi_desc->list, &acpi_descs);
2833 mutex_unlock(&acpi_desc_lock);
58cd71b4
DW		 2834 }
2835
20985164
VV		 2836 mutex_lock(&acpi_desc->init_mutex);
2837
2838 INIT_LIST_HEAD(&prev.spas);
2839 INIT_LIST_HEAD(&prev.memdevs);
2840 INIT_LIST_HEAD(&prev.dcrs);
2841 INIT_LIST_HEAD(&prev.bdws);
2842 INIT_LIST_HEAD(&prev.idts);
2843 INIT_LIST_HEAD(&prev.flushes);
2844
2845 list_cut_position(&prev.spas, &acpi_desc->spas,
2846 acpi_desc->spas.prev);
2847 list_cut_position(&prev.memdevs, &acpi_desc->memdevs,
2848 acpi_desc->memdevs.prev);
2849 list_cut_position(&prev.dcrs, &acpi_desc->dcrs,
2850 acpi_desc->dcrs.prev);
2851 list_cut_position(&prev.bdws, &acpi_desc->bdws,
2852 acpi_desc->bdws.prev);
2853 list_cut_position(&prev.idts, &acpi_desc->idts,
2854 acpi_desc->idts.prev);
2855 list_cut_position(&prev.flushes, &acpi_desc->flushes,
2856 acpi_desc->flushes.prev);
b94d5230 2857
b94d5230 2858 end = data + sz;
b94d5230 2859 while (!IS_ERR_OR_NULL(data))
20985164 2860 data = add_table(acpi_desc, &prev, data, end);
b94d5230
DW		 2861
2862 if (IS_ERR(data)) {
2863 dev_dbg(dev, "%s: nfit table parsing error: %ld\n", __func__,
2864 PTR_ERR(data));
20985164
VV		 2865 rc = PTR_ERR(data);
2866 goto out_unlock;
b94d5230
DW		 2867 }
2868
20985164
VV		 2869 rc = acpi_nfit_check_deletions(acpi_desc, &prev);
2870 if (rc)
2871 goto out_unlock;
2872
81ed4e36
DW		 2873 rc = nfit_mem_init(acpi_desc);
2874 if (rc)
20985164 2875 goto out_unlock;
62232e45 2876
1f7df6f8
DW		 2877 rc = acpi_nfit_register_dimms(acpi_desc);
2878 if (rc)
20985164
VV		 2879 goto out_unlock;
2880
2881 rc = acpi_nfit_register_regions(acpi_desc);
1f7df6f8 2882
20985164
VV		 2883 out_unlock:
2884 mutex_unlock(&acpi_desc->init_mutex);
2885 return rc;
b94d5230 2886}
6bc75619 2887EXPORT_SYMBOL_GPL(acpi_nfit_init);
b94d5230 2888
7ae0fa43
DW		 2889struct acpi_nfit_flush_work {
2890 struct work_struct work;
2891 struct completion cmp;
2892};
2893
2894static void flush_probe(struct work_struct *work)
2895{
2896 struct acpi_nfit_flush_work *flush;
2897
2898 flush = container_of(work, typeof(*flush), work);
2899 complete(&flush->cmp);
2900}
2901
2902static int acpi_nfit_flush_probe(struct nvdimm_bus_descriptor *nd_desc)
2903{
2904 struct acpi_nfit_desc *acpi_desc = to_acpi_nfit_desc(nd_desc);
2905 struct device *dev = acpi_desc->dev;
2906 struct acpi_nfit_flush_work flush;
e471486c 2907 int rc;
7ae0fa43
DW		 2908
2909 /* bounce the device lock to flush acpi_nfit_add / acpi_nfit_notify */
2910 device_lock(dev);
2911 device_unlock(dev);
2912
9ccaed4b
DW		 2913 /* bounce the init_mutex to make init_complete valid */
2914 mutex_lock(&acpi_desc->init_mutex);
fbabd829
DW		 2915 if (acpi_desc->cancel || acpi_desc->init_complete) {
2916 mutex_unlock(&acpi_desc->init_mutex);
9ccaed4b 2917 return 0;
fbabd829 2918 }
9ccaed4b 2919
7ae0fa43
DW		 2920 /*
2921 * Scrub work could take 10s of seconds, userspace may give up so we
2922 * need to be interruptible while waiting.
2923 */
2924 INIT_WORK_ONSTACK(&flush.work, flush_probe);
1c322ac0 2925 init_completion(&flush.cmp);
7ae0fa43 2926 queue_work(nfit_wq, &flush.work);
fbabd829 2927 mutex_unlock(&acpi_desc->init_mutex);
e471486c
DW		 2928
2929 rc = wait_for_completion_interruptible(&flush.cmp);
2930 cancel_work_sync(&flush.work);
2931 return rc;
7ae0fa43
DW		 2932}
2933
87bf572e
DW		 2934static int acpi_nfit_clear_to_send(struct nvdimm_bus_descriptor *nd_desc,
2935 struct nvdimm *nvdimm, unsigned int cmd)
2936{
2937 struct acpi_nfit_desc *acpi_desc = to_acpi_nfit_desc(nd_desc);
2938
2939 if (nvdimm)
2940 return 0;
2941 if (cmd != ND_CMD_ARS_START)
2942 return 0;
2943
2944 /*
2945 * The kernel and userspace may race to initiate a scrub, but
2946 * the scrub thread is prepared to lose that initial race. It
2947 * just needs guarantees that any ars it initiates are not
2948 * interrupted by any intervening start reqeusts from userspace.
2949 */
2950 if (work_busy(&acpi_desc->work))
2951 return -EBUSY;
2952
2953 return 0;
2954}
2955
80790039 2956int acpi_nfit_ars_rescan(struct acpi_nfit_desc *acpi_desc, u8 flags)
37b137ff
VV		 2957{
2958 struct device *dev = acpi_desc->dev;
2959 struct nfit_spa *nfit_spa;
2960
2961 if (work_busy(&acpi_desc->work))
2962 return -EBUSY;
2963
fbabd829
DW		 2964 mutex_lock(&acpi_desc->init_mutex);
2965 if (acpi_desc->cancel) {
2966 mutex_unlock(&acpi_desc->init_mutex);
37b137ff 2967 return 0;
fbabd829 2968 }
37b137ff 2969
37b137ff
VV		 2970 list_for_each_entry(nfit_spa, &acpi_desc->spas, list) {
2971 struct acpi_nfit_system_address *spa = nfit_spa->spa;
2972
2973 if (nfit_spa_type(spa) != NFIT_SPA_PM)
2974 continue;
2975
2976 nfit_spa->ars_required = 1;
2977 }
80790039 2978 acpi_desc->ars_start_flags = flags;
37b137ff
VV		 2979 queue_work(nfit_wq, &acpi_desc->work);
2980 dev_dbg(dev, "%s: ars_scan triggered\n", __func__);
2981 mutex_unlock(&acpi_desc->init_mutex);
2982
2983 return 0;
2984}
2985
a61fe6f7 2986void acpi_nfit_desc_init(struct acpi_nfit_desc *acpi_desc, struct device *dev)
b94d5230
DW		 2987{
2988 struct nvdimm_bus_descriptor *nd_desc;
b94d5230
DW		 2989
2990 dev_set_drvdata(dev, acpi_desc);
2991 acpi_desc->dev = dev;
6bc75619 2992 acpi_desc->blk_do_io = acpi_nfit_blk_region_do_io;
b94d5230
DW		 2993 nd_desc = &acpi_desc->nd_desc;
2994 nd_desc->provider_name = "ACPI.NFIT";
bc9775d8 2995 nd_desc->module = THIS_MODULE;
b94d5230 2996 nd_desc->ndctl = acpi_nfit_ctl;
7ae0fa43 2997 nd_desc->flush_probe = acpi_nfit_flush_probe;
87bf572e 2998 nd_desc->clear_to_send = acpi_nfit_clear_to_send;
45def22c 2999 nd_desc->attr_groups = acpi_nfit_attribute_groups;
b94d5230 3000
20985164
VV		 3001 INIT_LIST_HEAD(&acpi_desc->spas);
3002 INIT_LIST_HEAD(&acpi_desc->dcrs);
3003 INIT_LIST_HEAD(&acpi_desc->bdws);
3004 INIT_LIST_HEAD(&acpi_desc->idts);
3005 INIT_LIST_HEAD(&acpi_desc->flushes);
3006 INIT_LIST_HEAD(&acpi_desc->memdevs);
3007 INIT_LIST_HEAD(&acpi_desc->dimms);
6839a6d9 3008 INIT_LIST_HEAD(&acpi_desc->list);
20985164 3009 mutex_init(&acpi_desc->init_mutex);
1cf03c00 3010 INIT_WORK(&acpi_desc->work, acpi_nfit_scrub);
20985164 3011}
a61fe6f7 3012EXPORT_SYMBOL_GPL(acpi_nfit_desc_init);
20985164 3013
3c87f372
DW		 3014static void acpi_nfit_put_table(void *table)
3015{
3016 acpi_put_table(table);
3017}
3018
fbabd829
DW		 3019void acpi_nfit_shutdown(void *data)
3020{
3021 struct acpi_nfit_desc *acpi_desc = data;
3022 struct device *bus_dev = to_nvdimm_bus_dev(acpi_desc->nvdimm_bus);
3023
3024 /*
3025 * Destruct under acpi_desc_lock so that nfit_handle_mce does not
3026 * race teardown
3027 */
3028 mutex_lock(&acpi_desc_lock);
3029 list_del(&acpi_desc->list);
3030 mutex_unlock(&acpi_desc_lock);
3031
3032 mutex_lock(&acpi_desc->init_mutex);
3033 acpi_desc->cancel = 1;
3034 mutex_unlock(&acpi_desc->init_mutex);
3035
3036 /*
3037 * Bounce the nvdimm bus lock to make sure any in-flight
3038 * acpi_nfit_ars_rescan() submissions have had a chance to
3039 * either submit or see ->cancel set.
3040 */
3041 device_lock(bus_dev);
3042 device_unlock(bus_dev);
3043
3044 flush_workqueue(nfit_wq);
3045}
3046EXPORT_SYMBOL_GPL(acpi_nfit_shutdown);
3047
20985164
VV		 3048static int acpi_nfit_add(struct acpi_device *adev)
3049{
3050 struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL };
3051 struct acpi_nfit_desc *acpi_desc;
3052 struct device *dev = &adev->dev;
3053 struct acpi_table_header *tbl;
3054 acpi_status status = AE_OK;
3055 acpi_size sz;
31932041 3056 int rc = 0;
20985164 3057
6b11d1d6 3058 status = acpi_get_table(ACPI_SIG_NFIT, 0, &tbl);
20985164
VV		 3059 if (ACPI_FAILURE(status)) {
3060 /* This is ok, we could have an nvdimm hotplugged later */
3061 dev_dbg(dev, "failed to find NFIT at startup\n");
3062 return 0;
3063 }
3c87f372
DW		 3064
3065 rc = devm_add_action_or_reset(dev, acpi_nfit_put_table, tbl);
3066 if (rc)
3067 return rc;
6b11d1d6 3068 sz = tbl->length;
20985164 3069
a61fe6f7
DW		 3070 acpi_desc = devm_kzalloc(dev, sizeof(*acpi_desc), GFP_KERNEL);
3071 if (!acpi_desc)
3072 return -ENOMEM;
3073 acpi_nfit_desc_init(acpi_desc, &adev->dev);
20985164 3074
e7a11b44 3075 /* Save the acpi header for exporting the revision via sysfs */
6b577c9d 3076 acpi_desc->acpi_header = *tbl;
20985164
VV		 3077
3078 /* Evaluate _FIT and override with that if present */
3079 status = acpi_evaluate_object(adev->handle, "_FIT", NULL, &buf);
3080 if (ACPI_SUCCESS(status) && buf.length > 0) {
e7a11b44
DW		 3081 union acpi_object *obj = buf.pointer;
3082
3083 if (obj->type == ACPI_TYPE_BUFFER)
3084 rc = acpi_nfit_init(acpi_desc, obj->buffer.pointer,
3085 obj->buffer.length);
3086 else
6b577c9d
LK		 3087 dev_dbg(dev, "%s invalid type %d, ignoring _FIT\n",
3088 __func__, (int) obj->type);
31932041
DW		 3089 kfree(buf.pointer);
3090 } else
e7a11b44
DW		 3091 /* skip over the lead-in header table */
3092 rc = acpi_nfit_init(acpi_desc, (void *) tbl
3093 + sizeof(struct acpi_table_nfit),
3094 sz - sizeof(struct acpi_table_nfit));
fbabd829
DW		 3095
3096 if (rc)
3097 return rc;
3098 return devm_add_action_or_reset(dev, acpi_nfit_shutdown, acpi_desc);
b94d5230
DW		 3099}
3100
3101static int acpi_nfit_remove(struct acpi_device *adev)
3102{
fbabd829 3103 /* see acpi_nfit_unregister */
b94d5230
DW		 3104 return 0;
3105}
3106
56b47fe6 3107static void acpi_nfit_update_notify(struct device *dev, acpi_handle handle)
20985164 3108{
c14a868a 3109 struct acpi_nfit_desc *acpi_desc = dev_get_drvdata(dev);
20985164 3110 struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL };
e7a11b44 3111 union acpi_object *obj;
20985164
VV		 3112 acpi_status status;
3113 int ret;
3114
20985164
VV		 3115 if (!dev->driver) {
3116 /* dev->driver may be null if we're being removed */
3117 dev_dbg(dev, "%s: no driver found for dev\n", __func__);
c14a868a 3118 return;
20985164
VV		 3119 }
3120
3121 if (!acpi_desc) {
a61fe6f7
DW		 3122 acpi_desc = devm_kzalloc(dev, sizeof(*acpi_desc), GFP_KERNEL);
3123 if (!acpi_desc)
c14a868a
DW		 3124 return;
3125 acpi_nfit_desc_init(acpi_desc, dev);
7ae0fa43
DW		 3126 } else {
3127 /*
3128 * Finish previous registration before considering new
3129 * regions.
3130 */
3131 flush_workqueue(nfit_wq);
20985164
VV		 3132 }
3133
3134 /* Evaluate _FIT */
c14a868a 3135 status = acpi_evaluate_object(handle, "_FIT", NULL, &buf);
20985164
VV		 3136 if (ACPI_FAILURE(status)) {
3137 dev_err(dev, "failed to evaluate _FIT\n");
c14a868a 3138 return;
20985164
VV		 3139 }
3140
6b577c9d
LK		 3141 obj = buf.pointer;
3142 if (obj->type == ACPI_TYPE_BUFFER) {
e7a11b44
DW		 3143 ret = acpi_nfit_init(acpi_desc, obj->buffer.pointer,
3144 obj->buffer.length);
31932041 3145 if (ret)
6b577c9d 3146 dev_err(dev, "failed to merge updated NFIT\n");
31932041 3147 } else
6b577c9d 3148 dev_err(dev, "Invalid _FIT\n");
20985164 3149 kfree(buf.pointer);
c14a868a 3150}
56b47fe6
TK		 3151
3152static void acpi_nfit_uc_error_notify(struct device *dev, acpi_handle handle)
3153{
3154 struct acpi_nfit_desc *acpi_desc = dev_get_drvdata(dev);
80790039
TK		 3155 u8 flags = (acpi_desc->scrub_mode == HW_ERROR_SCRUB_ON) ?
3156 0 : ND_ARS_RETURN_PREV_DATA;
56b47fe6 3157
80790039 3158 acpi_nfit_ars_rescan(acpi_desc, flags);
56b47fe6
TK		 3159}
3160
3161void __acpi_nfit_notify(struct device *dev, acpi_handle handle, u32 event)
3162{
3163 dev_dbg(dev, "%s: event: 0x%x\n", __func__, event);
3164
3165 switch (event) {
3166 case NFIT_NOTIFY_UPDATE:
3167 return acpi_nfit_update_notify(dev, handle);
3168 case NFIT_NOTIFY_UC_MEMORY_ERROR:
3169 return acpi_nfit_uc_error_notify(dev, handle);
3170 default:
3171 return;
3172 }
3173}
c14a868a 3174EXPORT_SYMBOL_GPL(__acpi_nfit_notify);
20985164 3175
c14a868a
DW		 3176static void acpi_nfit_notify(struct acpi_device *adev, u32 event)
3177{
3178 device_lock(&adev->dev);
3179 __acpi_nfit_notify(&adev->dev, adev->handle, event);
3180 device_unlock(&adev->dev);
20985164
VV		 3181}
3182
b94d5230
DW		 3183static const struct acpi_device_id acpi_nfit_ids[] = {
3184 { "ACPI0012", 0 },
3185 { "", 0 },
3186};
3187MODULE_DEVICE_TABLE(acpi, acpi_nfit_ids);
3188
3189static struct acpi_driver acpi_nfit_driver = {
3190 .name = KBUILD_MODNAME,
3191 .ids = acpi_nfit_ids,
3192 .ops = {
3193 .add = acpi_nfit_add,
3194 .remove = acpi_nfit_remove,
20985164 3195 .notify = acpi_nfit_notify,
b94d5230
DW		 3196 },
3197};
3198
3199static __init int nfit_init(void)
3200{
7e700d2c
PB		 3201 int ret;
3202
b94d5230
DW		 3203 BUILD_BUG_ON(sizeof(struct acpi_table_nfit) != 40);
3204 BUILD_BUG_ON(sizeof(struct acpi_nfit_system_address) != 56);
3205 BUILD_BUG_ON(sizeof(struct acpi_nfit_memory_map) != 48);
3206 BUILD_BUG_ON(sizeof(struct acpi_nfit_interleave) != 20);
3207 BUILD_BUG_ON(sizeof(struct acpi_nfit_smbios) != 9);
3208 BUILD_BUG_ON(sizeof(struct acpi_nfit_control_region) != 80);
3209 BUILD_BUG_ON(sizeof(struct acpi_nfit_data_region) != 40);
3210
41c8bdb3
AS		 3211 guid_parse(UUID_VOLATILE_MEMORY, &nfit_uuid[NFIT_SPA_VOLATILE]);
3212 guid_parse(UUID_PERSISTENT_MEMORY, &nfit_uuid[NFIT_SPA_PM]);
3213 guid_parse(UUID_CONTROL_REGION, &nfit_uuid[NFIT_SPA_DCR]);
3214 guid_parse(UUID_DATA_REGION, &nfit_uuid[NFIT_SPA_BDW]);
3215 guid_parse(UUID_VOLATILE_VIRTUAL_DISK, &nfit_uuid[NFIT_SPA_VDISK]);
3216 guid_parse(UUID_VOLATILE_VIRTUAL_CD, &nfit_uuid[NFIT_SPA_VCD]);
3217 guid_parse(UUID_PERSISTENT_VIRTUAL_DISK, &nfit_uuid[NFIT_SPA_PDISK]);
3218 guid_parse(UUID_PERSISTENT_VIRTUAL_CD, &nfit_uuid[NFIT_SPA_PCD]);
3219 guid_parse(UUID_NFIT_BUS, &nfit_uuid[NFIT_DEV_BUS]);
3220 guid_parse(UUID_NFIT_DIMM, &nfit_uuid[NFIT_DEV_DIMM]);
3221 guid_parse(UUID_NFIT_DIMM_N_HPE1, &nfit_uuid[NFIT_DEV_DIMM_N_HPE1]);
3222 guid_parse(UUID_NFIT_DIMM_N_HPE2, &nfit_uuid[NFIT_DEV_DIMM_N_HPE2]);
3223 guid_parse(UUID_NFIT_DIMM_N_MSFT, &nfit_uuid[NFIT_DEV_DIMM_N_MSFT]);
b94d5230 3224
7ae0fa43
DW		 3225 nfit_wq = create_singlethread_workqueue("nfit");
3226 if (!nfit_wq)
3227 return -ENOMEM;
3228
6839a6d9 3229 nfit_mce_register();
7e700d2c
PB		 3230 ret = acpi_bus_register_driver(&acpi_nfit_driver);
3231 if (ret) {
3232 nfit_mce_unregister();
3233 destroy_workqueue(nfit_wq);
3234 }
3235
3236 return ret;
6839a6d9 3237
b94d5230
DW		 3238}
3239
3240static __exit void nfit_exit(void)
3241{
6839a6d9 3242 nfit_mce_unregister();
b94d5230 3243 acpi_bus_unregister_driver(&acpi_nfit_driver);
7ae0fa43 3244 destroy_workqueue(nfit_wq);
6839a6d9 3245 WARN_ON(!list_empty(&acpi_descs));
b94d5230
DW		 3246}
3247
3248module_init(nfit_init);
3249module_exit(nfit_exit);
3250MODULE_LICENSE("GPL v2");
3251MODULE_AUTHOR("Intel Corporation");
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