drivers/acpi/nfit/core.c

   1 /*
   2  * Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of version 2 of the GNU General Public License as
   6  * published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful, but
   9  * WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11  * General Public License for more details.
  12  */
  13 #include <linux/list_sort.h>
  14 #include <linux/libnvdimm.h>
  15 #include <linux/module.h>
  16 #include <linux/mutex.h>
  17 #include <linux/ndctl.h>
  18 #include <linux/sysfs.h>
  19 #include <linux/delay.h>
  20 #include <linux/list.h>
  21 #include <linux/acpi.h>
  22 #include <linux/sort.h>
  23 #include <linux/io.h>
  24 #include <linux/nd.h>
  25 #include <asm/cacheflush.h>
  26 #include <acpi/nfit.h>
  27 #include "nfit.h"
  28
  29 /*
  30  * For readq() and writeq() on 32-bit builds, the hi-lo, lo-hi order is
  31  * irrelevant.
  32  */
  33 #include <linux/io-64-nonatomic-hi-lo.h>
  34
  35 static bool force_enable_dimms;
  36 module_param(force_enable_dimms, bool, S_IRUGO|S_IWUSR);
  37 MODULE_PARM_DESC(force_enable_dimms, "Ignore _STA (ACPI DIMM device) status");
  38
  39 static bool disable_vendor_specific;
  40 module_param(disable_vendor_specific, bool, S_IRUGO);
  41 MODULE_PARM_DESC(disable_vendor_specific,
  42                 "Limit commands to the publicly specified set");
  43
  44 static unsigned long override_dsm_mask;
  45 module_param(override_dsm_mask, ulong, S_IRUGO);
  46 MODULE_PARM_DESC(override_dsm_mask, "Bitmask of allowed NVDIMM DSM functions");
  47
  48 static int default_dsm_family = -1;
  49 module_param(default_dsm_family, int, S_IRUGO);
  50 MODULE_PARM_DESC(default_dsm_family,
  51                 "Try this DSM type first when identifying NVDIMM family");
  52
  53 static bool no_init_ars;
  54 module_param(no_init_ars, bool, 0644);
  55 MODULE_PARM_DESC(no_init_ars, "Skip ARS run at nfit init time");
  56
  57 LIST_HEAD(acpi_descs);
  58 DEFINE_MUTEX(acpi_desc_lock);
  59
  60 static struct workqueue_struct *nfit_wq;
  61
  62 struct nfit_table_prev {
  63         struct list_head spas;
  64         struct list_head memdevs;
  65         struct list_head dcrs;
  66         struct list_head bdws;
  67         struct list_head idts;
  68         struct list_head flushes;
  69 };
  70
  71 static guid_t nfit_uuid[NFIT_UUID_MAX];
  72
  73 const guid_t *to_nfit_uuid(enum nfit_uuids id)
  74 {
  75         return &nfit_uuid[id];
  76 }
  77 EXPORT_SYMBOL(to_nfit_uuid);
  78
  79 static struct acpi_nfit_desc *to_acpi_nfit_desc(
  80                 struct nvdimm_bus_descriptor *nd_desc)
  81 {
  82         return container_of(nd_desc, struct acpi_nfit_desc, nd_desc);
  83 }
  84
  85 static struct acpi_device *to_acpi_dev(struct acpi_nfit_desc *acpi_desc)
  86 {
  87         struct nvdimm_bus_descriptor *nd_desc = &acpi_desc->nd_desc;
  88
  89         /*
  90          * If provider == 'ACPI.NFIT' we can assume 'dev' is a struct
  91          * acpi_device.
  92          */
  93         if (!nd_desc->provider_name
  94                         || strcmp(nd_desc->provider_name, "ACPI.NFIT") != 0)
  95                 return NULL;
  96
  97         return to_acpi_device(acpi_desc->dev);
  98 }
  99
 100 static int xlat_bus_status(void *buf, unsigned int cmd, u32 status)
 101 {
 102         struct nd_cmd_clear_error *clear_err;
 103         struct nd_cmd_ars_status *ars_status;
 104         u16 flags;
 105
 106         switch (cmd) {
 107         case ND_CMD_ARS_CAP:
 108                 if ((status & 0xffff) == NFIT_ARS_CAP_NONE)
 109                         return -ENOTTY;
 110
 111                 /* Command failed */
 112                 if (status & 0xffff)
 113                         return -EIO;
 114
 115                 /* No supported scan types for this range */
 116                 flags = ND_ARS_PERSISTENT | ND_ARS_VOLATILE;
 117                 if ((status >> 16 & flags) == 0)
 118                         return -ENOTTY;
 119                 return 0;
 120         case ND_CMD_ARS_START:
 121                 /* ARS is in progress */
 122                 if ((status & 0xffff) == NFIT_ARS_START_BUSY)
 123                         return -EBUSY;
 124
 125                 /* Command failed */
 126                 if (status & 0xffff)
 127                         return -EIO;
 128                 return 0;
 129         case ND_CMD_ARS_STATUS:
 130                 ars_status = buf;
 131                 /* Command failed */
 132                 if (status & 0xffff)
 133                         return -EIO;
 134                 /* Check extended status (Upper two bytes) */
 135                 if (status == NFIT_ARS_STATUS_DONE)
 136                         return 0;
 137
 138                 /* ARS is in progress */
 139                 if (status == NFIT_ARS_STATUS_BUSY)
 140                         return -EBUSY;
 141
 142                 /* No ARS performed for the current boot */
 143                 if (status == NFIT_ARS_STATUS_NONE)
 144                         return -EAGAIN;
 145
 146                 /*
 147                  * ARS interrupted, either we overflowed or some other
 148                  * agent wants the scan to stop.  If we didn't overflow
 149                  * then just continue with the returned results.
 150                  */
 151                 if (status == NFIT_ARS_STATUS_INTR) {
 152                         if (ars_status->out_length >= 40 && (ars_status->flags
 153                                                 & NFIT_ARS_F_OVERFLOW))
 154                                 return -ENOSPC;
 155                         return 0;
 156                 }
 157
 158                 /* Unknown status */
 159                 if (status >> 16)
 160                         return -EIO;
 161                 return 0;
 162         case ND_CMD_CLEAR_ERROR:
 163                 clear_err = buf;
 164                 if (status & 0xffff)
 165                         return -EIO;
 166                 if (!clear_err->cleared)
 167                         return -EIO;
 168                 if (clear_err->length > clear_err->cleared)
 169                         return clear_err->cleared;
 170                 return 0;
 171         default:
 172                 break;
 173         }
 174
 175         /* all other non-zero status results in an error */
 176         if (status)
 177                 return -EIO;
 178         return 0;
 179 }
 180
 181 #define ACPI_LABELS_LOCKED 3
 182
 183 static int xlat_nvdimm_status(struct nvdimm *nvdimm, void *buf, unsigned int cmd,
 184                 u32 status)
 185 {
 186         struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
 187
 188         switch (cmd) {
 189         case ND_CMD_GET_CONFIG_SIZE:
 190                 /*
 191                  * In the _LSI, _LSR, _LSW case the locked status is
 192                  * communicated via the read/write commands
 193                  */
 194                 if (nfit_mem->has_lsr)
 195                         break;
 196
 197                 if (status >> 16 & ND_CONFIG_LOCKED)
 198                         return -EACCES;
 199                 break;
 200         case ND_CMD_GET_CONFIG_DATA:
 201                 if (nfit_mem->has_lsr && status == ACPI_LABELS_LOCKED)
 202                         return -EACCES;
 203                 break;
 204         case ND_CMD_SET_CONFIG_DATA:
 205                 if (nfit_mem->has_lsw && status == ACPI_LABELS_LOCKED)
 206                         return -EACCES;
 207                 break;
 208         default:
 209                 break;
 210         }
 211
 212         /* all other non-zero status results in an error */
 213         if (status)
 214                 return -EIO;
 215         return 0;
 216 }
 217
 218 static int xlat_status(struct nvdimm *nvdimm, void *buf, unsigned int cmd,
 219                 u32 status)
 220 {
 221         if (!nvdimm)
 222                 return xlat_bus_status(buf, cmd, status);
 223         return xlat_nvdimm_status(nvdimm, buf, cmd, status);
 224 }
 225
 226 /* convert _LS{I,R} packages to the buffer object acpi_nfit_ctl expects */
 227 static union acpi_object *pkg_to_buf(union acpi_object *pkg)
 228 {
 229         int i;
 230         void *dst;
 231         size_t size = 0;
 232         union acpi_object *buf = NULL;
 233
 234         if (pkg->type != ACPI_TYPE_PACKAGE) {
 235                 WARN_ONCE(1, "BIOS bug, unexpected element type: %d\n",
 236                                 pkg->type);
 237                 goto err;
 238         }
 239
 240         for (i = 0; i < pkg->package.count; i++) {
 241                 union acpi_object *obj = &pkg->package.elements[i];
 242
 243                 if (obj->type == ACPI_TYPE_INTEGER)
 244                         size += 4;
 245                 else if (obj->type == ACPI_TYPE_BUFFER)
 246                         size += obj->buffer.length;
 247                 else {
 248                         WARN_ONCE(1, "BIOS bug, unexpected element type: %d\n",
 249                                         obj->type);
 250                         goto err;
 251                 }
 252         }
 253
 254         buf = ACPI_ALLOCATE(sizeof(*buf) + size);
 255         if (!buf)
 256                 goto err;
 257
 258         dst = buf + 1;
 259         buf->type = ACPI_TYPE_BUFFER;
 260         buf->buffer.length = size;
 261         buf->buffer.pointer = dst;
 262         for (i = 0; i < pkg->package.count; i++) {
 263                 union acpi_object *obj = &pkg->package.elements[i];
 264
 265                 if (obj->type == ACPI_TYPE_INTEGER) {
 266                         memcpy(dst, &obj->integer.value, 4);
 267                         dst += 4;
 268                 } else if (obj->type == ACPI_TYPE_BUFFER) {
 269                         memcpy(dst, obj->buffer.pointer, obj->buffer.length);
 270                         dst += obj->buffer.length;
 271                 }
 272         }
 273 err:
 274         ACPI_FREE(pkg);
 275         return buf;
 276 }
 277
 278 static union acpi_object *int_to_buf(union acpi_object *integer)
 279 {
 280         union acpi_object *buf = ACPI_ALLOCATE(sizeof(*buf) + 4);
 281         void *dst = NULL;
 282
 283         if (!buf)
 284                 goto err;
 285
 286         if (integer->type != ACPI_TYPE_INTEGER) {
 287                 WARN_ONCE(1, "BIOS bug, unexpected element type: %d\n",
 288                                 integer->type);
 289                 goto err;
 290         }
 291
 292         dst = buf + 1;
 293         buf->type = ACPI_TYPE_BUFFER;
 294         buf->buffer.length = 4;
 295         buf->buffer.pointer = dst;
 296         memcpy(dst, &integer->integer.value, 4);
 297 err:
 298         ACPI_FREE(integer);
 299         return buf;
 300 }
 301
 302 static union acpi_object *acpi_label_write(acpi_handle handle, u32 offset,
 303                 u32 len, void *data)
 304 {
 305         acpi_status rc;
 306         struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL };
 307         struct acpi_object_list input = {
 308                 .count = 3,
 309                 .pointer = (union acpi_object []) {
 310                         [0] = {
 311                                 .integer.type = ACPI_TYPE_INTEGER,
 312                                 .integer.value = offset,
 313                         },
 314                         [1] = {
 315                                 .integer.type = ACPI_TYPE_INTEGER,
 316                                 .integer.value = len,
 317                         },
 318                         [2] = {
 319                                 .buffer.type = ACPI_TYPE_BUFFER,
 320                                 .buffer.pointer = data,
 321                                 .buffer.length = len,
 322                         },
 323                 },
 324         };
 325
 326         rc = acpi_evaluate_object(handle, "_LSW", &input, &buf);
 327         if (ACPI_FAILURE(rc))
 328                 return NULL;
 329         return int_to_buf(buf.pointer);
 330 }
 331
 332 static union acpi_object *acpi_label_read(acpi_handle handle, u32 offset,
 333                 u32 len)
 334 {
 335         acpi_status rc;
 336         struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL };
 337         struct acpi_object_list input = {
 338                 .count = 2,
 339                 .pointer = (union acpi_object []) {
 340                         [0] = {
 341                                 .integer.type = ACPI_TYPE_INTEGER,
 342                                 .integer.value = offset,
 343                         },
 344                         [1] = {
 345                                 .integer.type = ACPI_TYPE_INTEGER,
 346                                 .integer.value = len,
 347                         },
 348                 },
 349         };
 350
 351         rc = acpi_evaluate_object(handle, "_LSR", &input, &buf);
 352         if (ACPI_FAILURE(rc))
 353                 return NULL;
 354         return pkg_to_buf(buf.pointer);
 355 }
 356
 357 static union acpi_object *acpi_label_info(acpi_handle handle)
 358 {
 359         acpi_status rc;
 360         struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL };
 361
 362         rc = acpi_evaluate_object(handle, "_LSI", NULL, &buf);
 363         if (ACPI_FAILURE(rc))
 364                 return NULL;
 365         return pkg_to_buf(buf.pointer);
 366 }
 367
 368 static u8 nfit_dsm_revid(unsigned family, unsigned func)
 369 {
 370         static const u8 revid_table[NVDIMM_FAMILY_MAX+1][32] = {
 371                 [NVDIMM_FAMILY_INTEL] = {
 372                         [NVDIMM_INTEL_GET_MODES] = 2,
 373                         [NVDIMM_INTEL_GET_FWINFO] = 2,
 374                         [NVDIMM_INTEL_START_FWUPDATE] = 2,
 375                         [NVDIMM_INTEL_SEND_FWUPDATE] = 2,
 376                         [NVDIMM_INTEL_FINISH_FWUPDATE] = 2,
 377                         [NVDIMM_INTEL_QUERY_FWUPDATE] = 2,
 378                         [NVDIMM_INTEL_SET_THRESHOLD] = 2,
 379                         [NVDIMM_INTEL_INJECT_ERROR] = 2,
 380                 },
 381         };
 382         u8 id;
 383
 384         if (family > NVDIMM_FAMILY_MAX)
 385                 return 0;
 386         if (func > 31)
 387                 return 0;
 388         id = revid_table[family][func];
 389         if (id == 0)
 390                 return 1; /* default */
 391         return id;
 392 }
 393
 394 int acpi_nfit_ctl(struct nvdimm_bus_descriptor *nd_desc, struct nvdimm *nvdimm,
 395                 unsigned int cmd, void *buf, unsigned int buf_len, int *cmd_rc)
 396 {
 397         struct acpi_nfit_desc *acpi_desc = to_acpi_nfit_desc(nd_desc);
 398         struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
 399         union acpi_object in_obj, in_buf, *out_obj;
 400         const struct nd_cmd_desc *desc = NULL;
 401         struct device *dev = acpi_desc->dev;
 402         struct nd_cmd_pkg *call_pkg = NULL;
 403         const char *cmd_name, *dimm_name;
 404         unsigned long cmd_mask, dsm_mask;
 405         u32 offset, fw_status = 0;
 406         acpi_handle handle;
 407         unsigned int func;
 408         const guid_t *guid;
 409         int rc, i;
 410
 411         *cmd_rc = -EINVAL;
 412         func = cmd;
 413         if (cmd == ND_CMD_CALL) {
 414                 call_pkg = buf;
 415                 func = call_pkg->nd_command;
 416
 417                 for (i = 0; i < ARRAY_SIZE(call_pkg->nd_reserved2); i++)
 418                         if (call_pkg->nd_reserved2[i])
 419                                 return -EINVAL;
 420         }
 421
 422         if (nvdimm) {
 423                 struct acpi_device *adev = nfit_mem->adev;
 424
 425                 if (!adev)
 426                         return -ENOTTY;
 427                 if (call_pkg && nfit_mem->family != call_pkg->nd_family)
 428                         return -ENOTTY;
 429
 430                 dimm_name = nvdimm_name(nvdimm);
 431                 cmd_name = nvdimm_cmd_name(cmd);
 432                 cmd_mask = nvdimm_cmd_mask(nvdimm);
 433                 dsm_mask = nfit_mem->dsm_mask;
 434                 desc = nd_cmd_dimm_desc(cmd);
 435                 guid = to_nfit_uuid(nfit_mem->family);
 436                 handle = adev->handle;
 437         } else {
 438                 struct acpi_device *adev = to_acpi_dev(acpi_desc);
 439
 440                 cmd_name = nvdimm_bus_cmd_name(cmd);
 441                 cmd_mask = nd_desc->cmd_mask;
 442                 dsm_mask = cmd_mask;
 443                 if (cmd == ND_CMD_CALL)
 444                         dsm_mask = nd_desc->bus_dsm_mask;
 445                 desc = nd_cmd_bus_desc(cmd);
 446                 guid = to_nfit_uuid(NFIT_DEV_BUS);
 447                 handle = adev->handle;
 448                 dimm_name = "bus";
 449         }
 450
 451         if (!desc || (cmd && (desc->out_num + desc->in_num == 0)))
 452                 return -ENOTTY;
 453
 454         if (!test_bit(cmd, &cmd_mask) || !test_bit(func, &dsm_mask))
 455                 return -ENOTTY;
 456
 457         in_obj.type = ACPI_TYPE_PACKAGE;
 458         in_obj.package.count = 1;
 459         in_obj.package.elements = &in_buf;
 460         in_buf.type = ACPI_TYPE_BUFFER;
 461         in_buf.buffer.pointer = buf;
 462         in_buf.buffer.length = 0;
 463
 464         /* libnvdimm has already validated the input envelope */
 465         for (i = 0; i < desc->in_num; i++)
 466                 in_buf.buffer.length += nd_cmd_in_size(nvdimm, cmd, desc,
 467                                 i, buf);
 468
 469         if (call_pkg) {
 470                 /* skip over package wrapper */
 471                 in_buf.buffer.pointer = (void *) &call_pkg->nd_payload;
 472                 in_buf.buffer.length = call_pkg->nd_size_in;
 473         }
 474
 475         dev_dbg(dev, "%s cmd: %d: func: %d input length: %d\n",
 476                 dimm_name, cmd, func, in_buf.buffer.length);
 477         print_hex_dump_debug("nvdimm in  ", DUMP_PREFIX_OFFSET, 4, 4,
 478                         in_buf.buffer.pointer,
 479                         min_t(u32, 256, in_buf.buffer.length), true);
 480
 481         /* call the BIOS, prefer the named methods over _DSM if available */
 482         if (nvdimm && cmd == ND_CMD_GET_CONFIG_SIZE && nfit_mem->has_lsr)
 483                 out_obj = acpi_label_info(handle);
 484         else if (nvdimm && cmd == ND_CMD_GET_CONFIG_DATA && nfit_mem->has_lsr) {
 485                 struct nd_cmd_get_config_data_hdr *p = buf;
 486
 487                 out_obj = acpi_label_read(handle, p->in_offset, p->in_length);
 488         } else if (nvdimm && cmd == ND_CMD_SET_CONFIG_DATA
 489                         && nfit_mem->has_lsw) {
 490                 struct nd_cmd_set_config_hdr *p = buf;
 491
 492                 out_obj = acpi_label_write(handle, p->in_offset, p->in_length,
 493                                 p->in_buf);
 494         } else {
 495                 u8 revid;
 496
 497                 if (nvdimm)
 498                         revid = nfit_dsm_revid(nfit_mem->family, func);
 499                 else
 500                         revid = 1;
 501                 out_obj = acpi_evaluate_dsm(handle, guid, revid, func, &in_obj);
 502         }
 503
 504         if (!out_obj) {
 505                 dev_dbg(dev, "%s _DSM failed cmd: %s\n", dimm_name, cmd_name);
 506                 return -EINVAL;
 507         }
 508
 509         if (call_pkg) {
 510                 call_pkg->nd_fw_size = out_obj->buffer.length;
 511                 memcpy(call_pkg->nd_payload + call_pkg->nd_size_in,
 512                         out_obj->buffer.pointer,
 513                         min(call_pkg->nd_fw_size, call_pkg->nd_size_out));
 514
 515                 ACPI_FREE(out_obj);
 516                 /*
 517                  * Need to support FW function w/o known size in advance.
 518                  * Caller can determine required size based upon nd_fw_size.
 519                  * If we return an error (like elsewhere) then caller wouldn't
 520                  * be able to rely upon data returned to make calculation.
 521                  */
 522                 *cmd_rc = 0;
 523                 return 0;
 524         }
 525
 526         if (out_obj->package.type != ACPI_TYPE_BUFFER) {
 527                 dev_dbg(dev, "%s unexpected output object type cmd: %s type: %d\n",
 528                                 dimm_name, cmd_name, out_obj->type);
 529                 rc = -EINVAL;
 530                 goto out;
 531         }
 532
 533         dev_dbg(dev, "%s cmd: %s output length: %d\n", dimm_name,
 534                         cmd_name, out_obj->buffer.length);
 535         print_hex_dump_debug(cmd_name, DUMP_PREFIX_OFFSET, 4, 4,
 536                         out_obj->buffer.pointer,
 537                         min_t(u32, 128, out_obj->buffer.length), true);
 538
 539         for (i = 0, offset = 0; i < desc->out_num; i++) {
 540                 u32 out_size = nd_cmd_out_size(nvdimm, cmd, desc, i, buf,
 541                                 (u32 *) out_obj->buffer.pointer,
 542                                 out_obj->buffer.length - offset);
 543
 544                 if (offset + out_size > out_obj->buffer.length) {
 545                         dev_dbg(dev, "%s output object underflow cmd: %s field: %d\n",
 546                                         dimm_name, cmd_name, i);
 547                         break;
 548                 }
 549
 550                 if (in_buf.buffer.length + offset + out_size > buf_len) {
 551                         dev_dbg(dev, "%s output overrun cmd: %s field: %d\n",
 552                                         dimm_name, cmd_name, i);
 553                         rc = -ENXIO;
 554                         goto out;
 555                 }
 556                 memcpy(buf + in_buf.buffer.length + offset,
 557                                 out_obj->buffer.pointer + offset, out_size);
 558                 offset += out_size;
 559         }
 560
 561         /*
 562          * Set fw_status for all the commands with a known format to be
 563          * later interpreted by xlat_status().
 564          */
 565         if (i >= 1 && ((!nvdimm && cmd >= ND_CMD_ARS_CAP
 566                                         && cmd <= ND_CMD_CLEAR_ERROR)
 567                                 || (nvdimm && cmd >= ND_CMD_SMART
 568                                         && cmd <= ND_CMD_VENDOR)))
 569                 fw_status = *(u32 *) out_obj->buffer.pointer;
 570
 571         if (offset + in_buf.buffer.length < buf_len) {
 572                 if (i >= 1) {
 573                         /*
 574                          * status valid, return the number of bytes left
 575                          * unfilled in the output buffer
 576                          */
 577                         rc = buf_len - offset - in_buf.buffer.length;
 578                         if (cmd_rc)
 579                                 *cmd_rc = xlat_status(nvdimm, buf, cmd,
 580                                                 fw_status);
 581                 } else {
 582                         dev_err(dev, "%s:%s underrun cmd: %s buf_len: %d out_len: %d\n",
 583                                         __func__, dimm_name, cmd_name, buf_len,
 584                                         offset);
 585                         rc = -ENXIO;
 586                 }
 587         } else {
 588                 rc = 0;
 589                 if (cmd_rc)
 590                         *cmd_rc = xlat_status(nvdimm, buf, cmd, fw_status);
 591         }
 592
 593  out:
 594         ACPI_FREE(out_obj);
 595
 596         return rc;
 597 }
 598 EXPORT_SYMBOL_GPL(acpi_nfit_ctl);
 599
 600 static const char *spa_type_name(u16 type)
 601 {
 602         static const char *to_name[] = {
 603                 [NFIT_SPA_VOLATILE] = "volatile",
 604                 [NFIT_SPA_PM] = "pmem",
 605                 [NFIT_SPA_DCR] = "dimm-control-region",
 606                 [NFIT_SPA_BDW] = "block-data-window",
 607                 [NFIT_SPA_VDISK] = "volatile-disk",
 608                 [NFIT_SPA_VCD] = "volatile-cd",
 609                 [NFIT_SPA_PDISK] = "persistent-disk",
 610                 [NFIT_SPA_PCD] = "persistent-cd",
 611
 612         };
 613
 614         if (type > NFIT_SPA_PCD)
 615                 return "unknown";
 616
 617         return to_name[type];
 618 }
 619
 620 int nfit_spa_type(struct acpi_nfit_system_address *spa)
 621 {
 622         int i;
 623
 624         for (i = 0; i < NFIT_UUID_MAX; i++)
 625                 if (guid_equal(to_nfit_uuid(i), (guid_t *)&spa->range_guid))
 626                         return i;
 627         return -1;
 628 }
 629
 630 static bool add_spa(struct acpi_nfit_desc *acpi_desc,
 631                 struct nfit_table_prev *prev,
 632                 struct acpi_nfit_system_address *spa)
 633 {
 634         struct device *dev = acpi_desc->dev;
 635         struct nfit_spa *nfit_spa;
 636
 637         if (spa->header.length != sizeof(*spa))
 638                 return false;
 639
 640         list_for_each_entry(nfit_spa, &prev->spas, list) {
 641                 if (memcmp(nfit_spa->spa, spa, sizeof(*spa)) == 0) {
 642                         list_move_tail(&nfit_spa->list, &acpi_desc->spas);
 643                         return true;
 644                 }
 645         }
 646
 647         nfit_spa = devm_kzalloc(dev, sizeof(*nfit_spa) + sizeof(*spa),
 648                         GFP_KERNEL);
 649         if (!nfit_spa)
 650                 return false;
 651         INIT_LIST_HEAD(&nfit_spa->list);
 652         memcpy(nfit_spa->spa, spa, sizeof(*spa));
 653         list_add_tail(&nfit_spa->list, &acpi_desc->spas);
 654         dev_dbg(dev, "spa index: %d type: %s\n",
 655                         spa->range_index,
 656                         spa_type_name(nfit_spa_type(spa)));
 657         return true;
 658 }
 659
 660 static bool add_memdev(struct acpi_nfit_desc *acpi_desc,
 661                 struct nfit_table_prev *prev,
 662                 struct acpi_nfit_memory_map *memdev)
 663 {
 664         struct device *dev = acpi_desc->dev;
 665         struct nfit_memdev *nfit_memdev;
 666
 667         if (memdev->header.length != sizeof(*memdev))
 668                 return false;
 669
 670         list_for_each_entry(nfit_memdev, &prev->memdevs, list)
 671                 if (memcmp(nfit_memdev->memdev, memdev, sizeof(*memdev)) == 0) {
 672                         list_move_tail(&nfit_memdev->list, &acpi_desc->memdevs);
 673                         return true;
 674                 }
 675
 676         nfit_memdev = devm_kzalloc(dev, sizeof(*nfit_memdev) + sizeof(*memdev),
 677                         GFP_KERNEL);
 678         if (!nfit_memdev)
 679                 return false;
 680         INIT_LIST_HEAD(&nfit_memdev->list);
 681         memcpy(nfit_memdev->memdev, memdev, sizeof(*memdev));
 682         list_add_tail(&nfit_memdev->list, &acpi_desc->memdevs);
 683         dev_dbg(dev, "memdev handle: %#x spa: %d dcr: %d flags: %#x\n",
 684                         memdev->device_handle, memdev->range_index,
 685                         memdev->region_index, memdev->flags);
 686         return true;
 687 }
 688
 689 int nfit_get_smbios_id(u32 device_handle, u16 *flags)
 690 {
 691         struct acpi_nfit_memory_map *memdev;
 692         struct acpi_nfit_desc *acpi_desc;
 693         struct nfit_mem *nfit_mem;
 694
 695         mutex_lock(&acpi_desc_lock);
 696         list_for_each_entry(acpi_desc, &acpi_descs, list) {
 697                 mutex_lock(&acpi_desc->init_mutex);
 698                 list_for_each_entry(nfit_mem, &acpi_desc->dimms, list) {
 699                         memdev = __to_nfit_memdev(nfit_mem);
 700                         if (memdev->device_handle == device_handle) {
 701                                 mutex_unlock(&acpi_desc->init_mutex);
 702                                 mutex_unlock(&acpi_desc_lock);
 703                                 *flags = memdev->flags;
 704                                 return memdev->physical_id;
 705                         }
 706                 }
 707                 mutex_unlock(&acpi_desc->init_mutex);
 708         }
 709         mutex_unlock(&acpi_desc_lock);
 710
 711         return -ENODEV;
 712 }
 713 EXPORT_SYMBOL_GPL(nfit_get_smbios_id);
 714
 715 /*
 716  * An implementation may provide a truncated control region if no block windows
 717  * are defined.
 718  */
 719 static size_t sizeof_dcr(struct acpi_nfit_control_region *dcr)
 720 {
 721         if (dcr->header.length < offsetof(struct acpi_nfit_control_region,
 722                                 window_size))
 723                 return 0;
 724         if (dcr->windows)
 725                 return sizeof(*dcr);
 726         return offsetof(struct acpi_nfit_control_region, window_size);
 727 }
 728
 729 static bool add_dcr(struct acpi_nfit_desc *acpi_desc,
 730                 struct nfit_table_prev *prev,
 731                 struct acpi_nfit_control_region *dcr)
 732 {
 733         struct device *dev = acpi_desc->dev;
 734         struct nfit_dcr *nfit_dcr;
 735
 736         if (!sizeof_dcr(dcr))
 737                 return false;
 738
 739         list_for_each_entry(nfit_dcr, &prev->dcrs, list)
 740                 if (memcmp(nfit_dcr->dcr, dcr, sizeof_dcr(dcr)) == 0) {
 741                         list_move_tail(&nfit_dcr->list, &acpi_desc->dcrs);
 742                         return true;
 743                 }
 744
 745         nfit_dcr = devm_kzalloc(dev, sizeof(*nfit_dcr) + sizeof(*dcr),
 746                         GFP_KERNEL);
 747         if (!nfit_dcr)
 748                 return false;
 749         INIT_LIST_HEAD(&nfit_dcr->list);
 750         memcpy(nfit_dcr->dcr, dcr, sizeof_dcr(dcr));
 751         list_add_tail(&nfit_dcr->list, &acpi_desc->dcrs);
 752         dev_dbg(dev, "dcr index: %d windows: %d\n",
 753                         dcr->region_index, dcr->windows);
 754         return true;
 755 }
 756
 757 static bool add_bdw(struct acpi_nfit_desc *acpi_desc,
 758                 struct nfit_table_prev *prev,
 759                 struct acpi_nfit_data_region *bdw)
 760 {
 761         struct device *dev = acpi_desc->dev;
 762         struct nfit_bdw *nfit_bdw;
 763
 764         if (bdw->header.length != sizeof(*bdw))
 765                 return false;
 766         list_for_each_entry(nfit_bdw, &prev->bdws, list)
 767                 if (memcmp(nfit_bdw->bdw, bdw, sizeof(*bdw)) == 0) {
 768                         list_move_tail(&nfit_bdw->list, &acpi_desc->bdws);
 769                         return true;
 770                 }
 771
 772         nfit_bdw = devm_kzalloc(dev, sizeof(*nfit_bdw) + sizeof(*bdw),
 773                         GFP_KERNEL);
 774         if (!nfit_bdw)
 775                 return false;
 776         INIT_LIST_HEAD(&nfit_bdw->list);
 777         memcpy(nfit_bdw->bdw, bdw, sizeof(*bdw));
 778         list_add_tail(&nfit_bdw->list, &acpi_desc->bdws);
 779         dev_dbg(dev, "bdw dcr: %d windows: %d\n",
 780                         bdw->region_index, bdw->windows);
 781         return true;
 782 }
 783
 784 static size_t sizeof_idt(struct acpi_nfit_interleave *idt)
 785 {
 786         if (idt->header.length < sizeof(*idt))
 787                 return 0;
 788         return sizeof(*idt) + sizeof(u32) * (idt->line_count - 1);
 789 }
 790
 791 static bool add_idt(struct acpi_nfit_desc *acpi_desc,
 792                 struct nfit_table_prev *prev,
 793                 struct acpi_nfit_interleave *idt)
 794 {
 795         struct device *dev = acpi_desc->dev;
 796         struct nfit_idt *nfit_idt;
 797
 798         if (!sizeof_idt(idt))
 799                 return false;
 800
 801         list_for_each_entry(nfit_idt, &prev->idts, list) {
 802                 if (sizeof_idt(nfit_idt->idt) != sizeof_idt(idt))
 803                         continue;
 804
 805                 if (memcmp(nfit_idt->idt, idt, sizeof_idt(idt)) == 0) {
 806                         list_move_tail(&nfit_idt->list, &acpi_desc->idts);
 807                         return true;
 808                 }
 809         }
 810
 811         nfit_idt = devm_kzalloc(dev, sizeof(*nfit_idt) + sizeof_idt(idt),
 812                         GFP_KERNEL);
 813         if (!nfit_idt)
 814                 return false;
 815         INIT_LIST_HEAD(&nfit_idt->list);
 816         memcpy(nfit_idt->idt, idt, sizeof_idt(idt));
 817         list_add_tail(&nfit_idt->list, &acpi_desc->idts);
 818         dev_dbg(dev, "idt index: %d num_lines: %d\n",
 819                         idt->interleave_index, idt->line_count);
 820         return true;
 821 }
 822
 823 static size_t sizeof_flush(struct acpi_nfit_flush_address *flush)
 824 {
 825         if (flush->header.length < sizeof(*flush))
 826                 return 0;
 827         return sizeof(*flush) + sizeof(u64) * (flush->hint_count - 1);
 828 }
 829
 830 static bool add_flush(struct acpi_nfit_desc *acpi_desc,
 831                 struct nfit_table_prev *prev,
 832                 struct acpi_nfit_flush_address *flush)
 833 {
 834         struct device *dev = acpi_desc->dev;
 835         struct nfit_flush *nfit_flush;
 836
 837         if (!sizeof_flush(flush))
 838                 return false;
 839
 840         list_for_each_entry(nfit_flush, &prev->flushes, list) {
 841                 if (sizeof_flush(nfit_flush->flush) != sizeof_flush(flush))
 842                         continue;
 843
 844                 if (memcmp(nfit_flush->flush, flush,
 845                                         sizeof_flush(flush)) == 0) {
 846                         list_move_tail(&nfit_flush->list, &acpi_desc->flushes);
 847                         return true;
 848                 }
 849         }
 850
 851         nfit_flush = devm_kzalloc(dev, sizeof(*nfit_flush)
 852                         + sizeof_flush(flush), GFP_KERNEL);
 853         if (!nfit_flush)
 854                 return false;
 855         INIT_LIST_HEAD(&nfit_flush->list);
 856         memcpy(nfit_flush->flush, flush, sizeof_flush(flush));
 857         list_add_tail(&nfit_flush->list, &acpi_desc->flushes);
 858         dev_dbg(dev, "nfit_flush handle: %d hint_count: %d\n",
 859                         flush->device_handle, flush->hint_count);
 860         return true;
 861 }
 862
 863 static bool add_platform_cap(struct acpi_nfit_desc *acpi_desc,
 864                 struct acpi_nfit_capabilities *pcap)
 865 {
 866         struct device *dev = acpi_desc->dev;
 867         u32 mask;
 868
 869         mask = (1 << (pcap->highest_capability + 1)) - 1;
 870         acpi_desc->platform_cap = pcap->capabilities & mask;
 871         dev_dbg(dev, "cap: %#x\n", acpi_desc->platform_cap);
 872         return true;
 873 }
 874
 875 static void *add_table(struct acpi_nfit_desc *acpi_desc,
 876                 struct nfit_table_prev *prev, void *table, const void *end)
 877 {
 878         struct device *dev = acpi_desc->dev;
 879         struct acpi_nfit_header *hdr;
 880         void *err = ERR_PTR(-ENOMEM);
 881
 882         if (table >= end)
 883                 return NULL;
 884
 885         hdr = table;
 886         if (!hdr->length) {
 887                 dev_warn(dev, "found a zero length table '%d' parsing nfit\n",
 888                         hdr->type);
 889                 return NULL;
 890         }
 891
 892         switch (hdr->type) {
 893         case ACPI_NFIT_TYPE_SYSTEM_ADDRESS:
 894                 if (!add_spa(acpi_desc, prev, table))
 895                         return err;
 896                 break;
 897         case ACPI_NFIT_TYPE_MEMORY_MAP:
 898                 if (!add_memdev(acpi_desc, prev, table))
 899                         return err;
 900                 break;
 901         case ACPI_NFIT_TYPE_CONTROL_REGION:
 902                 if (!add_dcr(acpi_desc, prev, table))
 903                         return err;
 904                 break;
 905         case ACPI_NFIT_TYPE_DATA_REGION:
 906                 if (!add_bdw(acpi_desc, prev, table))
 907                         return err;
 908                 break;
 909         case ACPI_NFIT_TYPE_INTERLEAVE:
 910                 if (!add_idt(acpi_desc, prev, table))
 911                         return err;
 912                 break;
 913         case ACPI_NFIT_TYPE_FLUSH_ADDRESS:
 914                 if (!add_flush(acpi_desc, prev, table))
 915                         return err;
 916                 break;
 917         case ACPI_NFIT_TYPE_SMBIOS:
 918                 dev_dbg(dev, "smbios\n");
 919                 break;
 920         case ACPI_NFIT_TYPE_CAPABILITIES:
 921                 if (!add_platform_cap(acpi_desc, table))
 922                         return err;
 923                 break;
 924         default:
 925                 dev_err(dev, "unknown table '%d' parsing nfit\n", hdr->type);
 926                 break;
 927         }
 928
 929         return table + hdr->length;
 930 }
 931
 932 static void nfit_mem_find_spa_bdw(struct acpi_nfit_desc *acpi_desc,
 933                 struct nfit_mem *nfit_mem)
 934 {
 935         u32 device_handle = __to_nfit_memdev(nfit_mem)->device_handle;
 936         u16 dcr = nfit_mem->dcr->region_index;
 937         struct nfit_spa *nfit_spa;
 938
 939         list_for_each_entry(nfit_spa, &acpi_desc->spas, list) {
 940                 u16 range_index = nfit_spa->spa->range_index;
 941                 int type = nfit_spa_type(nfit_spa->spa);
 942                 struct nfit_memdev *nfit_memdev;
 943
 944                 if (type != NFIT_SPA_BDW)
 945                         continue;
 946
 947                 list_for_each_entry(nfit_memdev, &acpi_desc->memdevs, list) {
 948                         if (nfit_memdev->memdev->range_index != range_index)
 949                                 continue;
 950                         if (nfit_memdev->memdev->device_handle != device_handle)
 951                                 continue;
 952                         if (nfit_memdev->memdev->region_index != dcr)
 953                                 continue;
 954
 955                         nfit_mem->spa_bdw = nfit_spa->spa;
 956                         return;
 957                 }
 958         }
 959
 960         dev_dbg(acpi_desc->dev, "SPA-BDW not found for SPA-DCR %d\n",
 961                         nfit_mem->spa_dcr->range_index);
 962         nfit_mem->bdw = NULL;
 963 }
 964
 965 static void nfit_mem_init_bdw(struct acpi_nfit_desc *acpi_desc,
 966                 struct nfit_mem *nfit_mem, struct acpi_nfit_system_address *spa)
 967 {
 968         u16 dcr = __to_nfit_memdev(nfit_mem)->region_index;
 969         struct nfit_memdev *nfit_memdev;
 970         struct nfit_bdw *nfit_bdw;
 971         struct nfit_idt *nfit_idt;
 972         u16 idt_idx, range_index;
 973
 974         list_for_each_entry(nfit_bdw, &acpi_desc->bdws, list) {
 975                 if (nfit_bdw->bdw->region_index != dcr)
 976                         continue;
 977                 nfit_mem->bdw = nfit_bdw->bdw;
 978                 break;
 979         }
 980
 981         if (!nfit_mem->bdw)
 982                 return;
 983
 984         nfit_mem_find_spa_bdw(acpi_desc, nfit_mem);
 985
 986         if (!nfit_mem->spa_bdw)
 987                 return;
 988
 989         range_index = nfit_mem->spa_bdw->range_index;
 990         list_for_each_entry(nfit_memdev, &acpi_desc->memdevs, list) {
 991                 if (nfit_memdev->memdev->range_index != range_index ||
 992                                 nfit_memdev->memdev->region_index != dcr)
 993                         continue;
 994                 nfit_mem->memdev_bdw = nfit_memdev->memdev;
 995                 idt_idx = nfit_memdev->memdev->interleave_index;
 996                 list_for_each_entry(nfit_idt, &acpi_desc->idts, list) {
 997                         if (nfit_idt->idt->interleave_index != idt_idx)
 998                                 continue;
 999                         nfit_mem->idt_bdw = nfit_idt->idt;
1000                         break;
1001                 }
1002                 break;
1003         }
1004 }
1005
1006 static int __nfit_mem_init(struct acpi_nfit_desc *acpi_desc,
1007                 struct acpi_nfit_system_address *spa)
1008 {
1009         struct nfit_mem *nfit_mem, *found;
1010         struct nfit_memdev *nfit_memdev;
1011         int type = spa ? nfit_spa_type(spa) : 0;
1012
1013         switch (type) {
1014         case NFIT_SPA_DCR:
1015         case NFIT_SPA_PM:
1016                 break;
1017         default:
1018                 if (spa)
1019                         return 0;
1020         }
1021
1022         /*
1023          * This loop runs in two modes, when a dimm is mapped the loop
1024          * adds memdev associations to an existing dimm, or creates a
1025          * dimm. In the unmapped dimm case this loop sweeps for memdev
1026          * instances with an invalid / zero range_index and adds those
1027          * dimms without spa associations.
1028          */
1029         list_for_each_entry(nfit_memdev, &acpi_desc->memdevs, list) {
1030                 struct nfit_flush *nfit_flush;
1031                 struct nfit_dcr *nfit_dcr;
1032                 u32 device_handle;
1033                 u16 dcr;
1034
1035                 if (spa && nfit_memdev->memdev->range_index != spa->range_index)
1036                         continue;
1037                 if (!spa && nfit_memdev->memdev->range_index)
1038                         continue;
1039                 found = NULL;
1040                 dcr = nfit_memdev->memdev->region_index;
1041                 device_handle = nfit_memdev->memdev->device_handle;
1042                 list_for_each_entry(nfit_mem, &acpi_desc->dimms, list)
1043                         if (__to_nfit_memdev(nfit_mem)->device_handle
1044                                         == device_handle) {
1045                                 found = nfit_mem;
1046                                 break;
1047                         }
1048
1049                 if (found)
1050                         nfit_mem = found;
1051                 else {
1052                         nfit_mem = devm_kzalloc(acpi_desc->dev,
1053                                         sizeof(*nfit_mem), GFP_KERNEL);
1054                         if (!nfit_mem)
1055                                 return -ENOMEM;
1056                         INIT_LIST_HEAD(&nfit_mem->list);
1057                         nfit_mem->acpi_desc = acpi_desc;
1058                         list_add(&nfit_mem->list, &acpi_desc->dimms);
1059                 }
1060
1061                 list_for_each_entry(nfit_dcr, &acpi_desc->dcrs, list) {
1062                         if (nfit_dcr->dcr->region_index != dcr)
1063                                 continue;
1064                         /*
1065                          * Record the control region for the dimm.  For
1066                          * the ACPI 6.1 case, where there are separate
1067                          * control regions for the pmem vs blk
1068                          * interfaces, be sure to record the extended
1069                          * blk details.
1070                          */
1071                         if (!nfit_mem->dcr)
1072                                 nfit_mem->dcr = nfit_dcr->dcr;
1073                         else if (nfit_mem->dcr->windows == 0
1074                                         && nfit_dcr->dcr->windows)
1075                                 nfit_mem->dcr = nfit_dcr->dcr;
1076                         break;
1077                 }
1078
1079                 list_for_each_entry(nfit_flush, &acpi_desc->flushes, list) {
1080                         struct acpi_nfit_flush_address *flush;
1081                         u16 i;
1082
1083                         if (nfit_flush->flush->device_handle != device_handle)
1084                                 continue;
1085                         nfit_mem->nfit_flush = nfit_flush;
1086                         flush = nfit_flush->flush;
1087                         nfit_mem->flush_wpq = devm_kcalloc(acpi_desc->dev,
1088                                         flush->hint_count,
1089                                         sizeof(struct resource),
1090                                         GFP_KERNEL);
1091                         if (!nfit_mem->flush_wpq)
1092                                 return -ENOMEM;
1093                         for (i = 0; i < flush->hint_count; i++) {
1094                                 struct resource *res = &nfit_mem->flush_wpq[i];
1095
1096                                 res->start = flush->hint_address[i];
1097                                 res->end = res->start + 8 - 1;
1098                         }
1099                         break;
1100                 }
1101
1102                 if (dcr && !nfit_mem->dcr) {
1103                         dev_err(acpi_desc->dev, "SPA %d missing DCR %d\n",
1104                                         spa->range_index, dcr);
1105                         return -ENODEV;
1106                 }
1107
1108                 if (type == NFIT_SPA_DCR) {
1109                         struct nfit_idt *nfit_idt;
1110                         u16 idt_idx;
1111
1112                         /* multiple dimms may share a SPA when interleaved */
1113                         nfit_mem->spa_dcr = spa;
1114                         nfit_mem->memdev_dcr = nfit_memdev->memdev;
1115                         idt_idx = nfit_memdev->memdev->interleave_index;
1116                         list_for_each_entry(nfit_idt, &acpi_desc->idts, list) {
1117                                 if (nfit_idt->idt->interleave_index != idt_idx)
1118                                         continue;
1119                                 nfit_mem->idt_dcr = nfit_idt->idt;
1120                                 break;
1121                         }
1122                         nfit_mem_init_bdw(acpi_desc, nfit_mem, spa);
1123                 } else if (type == NFIT_SPA_PM) {
1124                         /*
1125                          * A single dimm may belong to multiple SPA-PM
1126                          * ranges, record at least one in addition to
1127                          * any SPA-DCR range.
1128                          */
1129                         nfit_mem->memdev_pmem = nfit_memdev->memdev;
1130                 } else
1131                         nfit_mem->memdev_dcr = nfit_memdev->memdev;
1132         }
1133
1134         return 0;
1135 }
1136
1137 static int nfit_mem_cmp(void *priv, struct list_head *_a, struct list_head *_b)
1138 {
1139         struct nfit_mem *a = container_of(_a, typeof(*a), list);
1140         struct nfit_mem *b = container_of(_b, typeof(*b), list);
1141         u32 handleA, handleB;
1142
1143         handleA = __to_nfit_memdev(a)->device_handle;
1144         handleB = __to_nfit_memdev(b)->device_handle;
1145         if (handleA < handleB)
1146                 return -1;
1147         else if (handleA > handleB)
1148                 return 1;
1149         return 0;
1150 }
1151
1152 static int nfit_mem_init(struct acpi_nfit_desc *acpi_desc)
1153 {
1154         struct nfit_spa *nfit_spa;
1155         int rc;
1156
1157
1158         /*
1159          * For each SPA-DCR or SPA-PMEM address range find its
1160          * corresponding MEMDEV(s).  From each MEMDEV find the
1161          * corresponding DCR.  Then, if we're operating on a SPA-DCR,
1162          * try to find a SPA-BDW and a corresponding BDW that references
1163          * the DCR.  Throw it all into an nfit_mem object.  Note, that
1164          * BDWs are optional.
1165          */
1166         list_for_each_entry(nfit_spa, &acpi_desc->spas, list) {
1167                 rc = __nfit_mem_init(acpi_desc, nfit_spa->spa);
1168                 if (rc)
1169                         return rc;
1170         }
1171
1172         /*
1173          * If a DIMM has failed to be mapped into SPA there will be no
1174          * SPA entries above. Find and register all the unmapped DIMMs
1175          * for reporting and recovery purposes.
1176          */
1177         rc = __nfit_mem_init(acpi_desc, NULL);
1178         if (rc)
1179                 return rc;
1180
1181         list_sort(NULL, &acpi_desc->dimms, nfit_mem_cmp);
1182
1183         return 0;
1184 }
1185
1186 static ssize_t bus_dsm_mask_show(struct device *dev,
1187                 struct device_attribute *attr, char *buf)
1188 {
1189         struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev);
1190         struct nvdimm_bus_descriptor *nd_desc = to_nd_desc(nvdimm_bus);
1191
1192         return sprintf(buf, "%#lx\n", nd_desc->bus_dsm_mask);
1193 }
1194 static struct device_attribute dev_attr_bus_dsm_mask =
1195                 __ATTR(dsm_mask, 0444, bus_dsm_mask_show, NULL);
1196
1197 static ssize_t revision_show(struct device *dev,
1198                 struct device_attribute *attr, char *buf)
1199 {
1200         struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev);
1201         struct nvdimm_bus_descriptor *nd_desc = to_nd_desc(nvdimm_bus);
1202         struct acpi_nfit_desc *acpi_desc = to_acpi_desc(nd_desc);
1203
1204         return sprintf(buf, "%d\n", acpi_desc->acpi_header.revision);
1205 }
1206 static DEVICE_ATTR_RO(revision);
1207
1208 static ssize_t hw_error_scrub_show(struct device *dev,
1209                 struct device_attribute *attr, char *buf)
1210 {
1211         struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev);
1212         struct nvdimm_bus_descriptor *nd_desc = to_nd_desc(nvdimm_bus);
1213         struct acpi_nfit_desc *acpi_desc = to_acpi_desc(nd_desc);
1214
1215         return sprintf(buf, "%d\n", acpi_desc->scrub_mode);
1216 }
1217
1218 /*
1219  * The 'hw_error_scrub' attribute can have the following values written to it:
1220  * '0': Switch to the default mode where an exception will only insert
1221  *      the address of the memory error into the poison and badblocks lists.
1222  * '1': Enable a full scrub to happen if an exception for a memory error is
1223  *      received.
1224  */
1225 static ssize_t hw_error_scrub_store(struct device *dev,
1226                 struct device_attribute *attr, const char *buf, size_t size)
1227 {
1228         struct nvdimm_bus_descriptor *nd_desc;
1229         ssize_t rc;
1230         long val;
1231
1232         rc = kstrtol(buf, 0, &val);
1233         if (rc)
1234                 return rc;
1235
1236         device_lock(dev);
1237         nd_desc = dev_get_drvdata(dev);
1238         if (nd_desc) {
1239                 struct acpi_nfit_desc *acpi_desc = to_acpi_desc(nd_desc);
1240
1241                 switch (val) {
1242                 case HW_ERROR_SCRUB_ON:
1243                         acpi_desc->scrub_mode = HW_ERROR_SCRUB_ON;
1244                         break;
1245                 case HW_ERROR_SCRUB_OFF:
1246                         acpi_desc->scrub_mode = HW_ERROR_SCRUB_OFF;
1247                         break;
1248                 default:
1249                         rc = -EINVAL;
1250                         break;
1251                 }
1252         }
1253         device_unlock(dev);
1254         if (rc)
1255                 return rc;
1256         return size;
1257 }
1258 static DEVICE_ATTR_RW(hw_error_scrub);
1259
1260 /*
1261  * This shows the number of full Address Range Scrubs that have been
1262  * completed since driver load time. Userspace can wait on this using
1263  * select/poll etc. A '+' at the end indicates an ARS is in progress
1264  */
1265 static ssize_t scrub_show(struct device *dev,
1266                 struct device_attribute *attr, char *buf)
1267 {
1268         struct nvdimm_bus_descriptor *nd_desc;
1269         ssize_t rc = -ENXIO;
1270
1271         device_lock(dev);
1272         nd_desc = dev_get_drvdata(dev);
1273         if (nd_desc) {
1274                 struct acpi_nfit_desc *acpi_desc = to_acpi_desc(nd_desc);
1275
1276                 mutex_lock(&acpi_desc->init_mutex);
1277                 rc = sprintf(buf, "%d%s", acpi_desc->scrub_count,
1278                                 acpi_desc->scrub_busy
1279                                 && !acpi_desc->cancel ? "+\n" : "\n");
1280                 mutex_unlock(&acpi_desc->init_mutex);
1281         }
1282         device_unlock(dev);
1283         return rc;
1284 }
1285
1286 static ssize_t scrub_store(struct device *dev,
1287                 struct device_attribute *attr, const char *buf, size_t size)
1288 {
1289         struct nvdimm_bus_descriptor *nd_desc;
1290         ssize_t rc;
1291         long val;
1292
1293         rc = kstrtol(buf, 0, &val);
1294         if (rc)
1295                 return rc;
1296         if (val != 1)
1297                 return -EINVAL;
1298
1299         device_lock(dev);
1300         nd_desc = dev_get_drvdata(dev);
1301         if (nd_desc) {
1302                 struct acpi_nfit_desc *acpi_desc = to_acpi_desc(nd_desc);
1303
1304                 rc = acpi_nfit_ars_rescan(acpi_desc, 0);
1305         }
1306         device_unlock(dev);
1307         if (rc)
1308                 return rc;
1309         return size;
1310 }
1311 static DEVICE_ATTR_RW(scrub);
1312
1313 static bool ars_supported(struct nvdimm_bus *nvdimm_bus)
1314 {
1315         struct nvdimm_bus_descriptor *nd_desc = to_nd_desc(nvdimm_bus);
1316         const unsigned long mask = 1 << ND_CMD_ARS_CAP | 1 << ND_CMD_ARS_START
1317                 | 1 << ND_CMD_ARS_STATUS;
1318
1319         return (nd_desc->cmd_mask & mask) == mask;
1320 }
1321
1322 static umode_t nfit_visible(struct kobject *kobj, struct attribute *a, int n)
1323 {
1324         struct device *dev = container_of(kobj, struct device, kobj);
1325         struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev);
1326
1327         if (a == &dev_attr_scrub.attr && !ars_supported(nvdimm_bus))
1328                 return 0;
1329         return a->mode;
1330 }
1331
1332 static struct attribute *acpi_nfit_attributes[] = {
1333         &dev_attr_revision.attr,
1334         &dev_attr_scrub.attr,
1335         &dev_attr_hw_error_scrub.attr,
1336         &dev_attr_bus_dsm_mask.attr,
1337         NULL,
1338 };
1339
1340 static const struct attribute_group acpi_nfit_attribute_group = {
1341         .name = "nfit",
1342         .attrs = acpi_nfit_attributes,
1343         .is_visible = nfit_visible,
1344 };
1345
1346 static const struct attribute_group *acpi_nfit_attribute_groups[] = {
1347         &nvdimm_bus_attribute_group,
1348         &acpi_nfit_attribute_group,
1349         NULL,
1350 };
1351
1352 static struct acpi_nfit_memory_map *to_nfit_memdev(struct device *dev)
1353 {
1354         struct nvdimm *nvdimm = to_nvdimm(dev);
1355         struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
1356
1357         return __to_nfit_memdev(nfit_mem);
1358 }
1359
1360 static struct acpi_nfit_control_region *to_nfit_dcr(struct device *dev)
1361 {
1362         struct nvdimm *nvdimm = to_nvdimm(dev);
1363         struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
1364
1365         return nfit_mem->dcr;
1366 }
1367
1368 static ssize_t handle_show(struct device *dev,
1369                 struct device_attribute *attr, char *buf)
1370 {
1371         struct acpi_nfit_memory_map *memdev = to_nfit_memdev(dev);
1372
1373         return sprintf(buf, "%#x\n", memdev->device_handle);
1374 }
1375 static DEVICE_ATTR_RO(handle);
1376
1377 static ssize_t phys_id_show(struct device *dev,
1378                 struct device_attribute *attr, char *buf)
1379 {
1380         struct acpi_nfit_memory_map *memdev = to_nfit_memdev(dev);
1381
1382         return sprintf(buf, "%#x\n", memdev->physical_id);
1383 }
1384 static DEVICE_ATTR_RO(phys_id);
1385
1386 static ssize_t vendor_show(struct device *dev,
1387                 struct device_attribute *attr, char *buf)
1388 {
1389         struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev);
1390
1391         return sprintf(buf, "0x%04x\n", be16_to_cpu(dcr->vendor_id));
1392 }
1393 static DEVICE_ATTR_RO(vendor);
1394
1395 static ssize_t rev_id_show(struct device *dev,
1396                 struct device_attribute *attr, char *buf)
1397 {
1398         struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev);
1399
1400         return sprintf(buf, "0x%04x\n", be16_to_cpu(dcr->revision_id));
1401 }
1402 static DEVICE_ATTR_RO(rev_id);
1403
1404 static ssize_t device_show(struct device *dev,
1405                 struct device_attribute *attr, char *buf)
1406 {
1407         struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev);
1408
1409         return sprintf(buf, "0x%04x\n", be16_to_cpu(dcr->device_id));
1410 }
1411 static DEVICE_ATTR_RO(device);
1412
1413 static ssize_t subsystem_vendor_show(struct device *dev,
1414                 struct device_attribute *attr, char *buf)
1415 {
1416         struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev);
1417
1418         return sprintf(buf, "0x%04x\n", be16_to_cpu(dcr->subsystem_vendor_id));
1419 }
1420 static DEVICE_ATTR_RO(subsystem_vendor);
1421
1422 static ssize_t subsystem_rev_id_show(struct device *dev,
1423                 struct device_attribute *attr, char *buf)
1424 {
1425         struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev);
1426
1427         return sprintf(buf, "0x%04x\n",
1428                         be16_to_cpu(dcr->subsystem_revision_id));
1429 }
1430 static DEVICE_ATTR_RO(subsystem_rev_id);
1431
1432 static ssize_t subsystem_device_show(struct device *dev,
1433                 struct device_attribute *attr, char *buf)
1434 {
1435         struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev);
1436
1437         return sprintf(buf, "0x%04x\n", be16_to_cpu(dcr->subsystem_device_id));
1438 }
1439 static DEVICE_ATTR_RO(subsystem_device);
1440
1441 static int num_nvdimm_formats(struct nvdimm *nvdimm)
1442 {
1443         struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
1444         int formats = 0;
1445
1446         if (nfit_mem->memdev_pmem)
1447                 formats++;
1448         if (nfit_mem->memdev_bdw)
1449                 formats++;
1450         return formats;
1451 }
1452
1453 static ssize_t format_show(struct device *dev,
1454                 struct device_attribute *attr, char *buf)
1455 {
1456         struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev);
1457
1458         return sprintf(buf, "0x%04x\n", le16_to_cpu(dcr->code));
1459 }
1460 static DEVICE_ATTR_RO(format);
1461
1462 static ssize_t format1_show(struct device *dev,
1463                 struct device_attribute *attr, char *buf)
1464 {
1465         u32 handle;
1466         ssize_t rc = -ENXIO;
1467         struct nfit_mem *nfit_mem;
1468         struct nfit_memdev *nfit_memdev;
1469         struct acpi_nfit_desc *acpi_desc;
1470         struct nvdimm *nvdimm = to_nvdimm(dev);
1471         struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev);
1472
1473         nfit_mem = nvdimm_provider_data(nvdimm);
1474         acpi_desc = nfit_mem->acpi_desc;
1475         handle = to_nfit_memdev(dev)->device_handle;
1476
1477         /* assumes DIMMs have at most 2 published interface codes */
1478         mutex_lock(&acpi_desc->init_mutex);
1479         list_for_each_entry(nfit_memdev, &acpi_desc->memdevs, list) {
1480                 struct acpi_nfit_memory_map *memdev = nfit_memdev->memdev;
1481                 struct nfit_dcr *nfit_dcr;
1482
1483                 if (memdev->device_handle != handle)
1484                         continue;
1485
1486                 list_for_each_entry(nfit_dcr, &acpi_desc->dcrs, list) {
1487                         if (nfit_dcr->dcr->region_index != memdev->region_index)
1488                                 continue;
1489                         if (nfit_dcr->dcr->code == dcr->code)
1490                                 continue;
1491                         rc = sprintf(buf, "0x%04x\n",
1492                                         le16_to_cpu(nfit_dcr->dcr->code));
1493                         break;
1494                 }
1495                 if (rc != ENXIO)
1496                         break;
1497         }
1498         mutex_unlock(&acpi_desc->init_mutex);
1499         return rc;
1500 }
1501 static DEVICE_ATTR_RO(format1);
1502
1503 static ssize_t formats_show(struct device *dev,
1504                 struct device_attribute *attr, char *buf)
1505 {
1506         struct nvdimm *nvdimm = to_nvdimm(dev);
1507
1508         return sprintf(buf, "%d\n", num_nvdimm_formats(nvdimm));
1509 }
1510 static DEVICE_ATTR_RO(formats);
1511
1512 static ssize_t serial_show(struct device *dev,
1513                 struct device_attribute *attr, char *buf)
1514 {
1515         struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev);
1516
1517         return sprintf(buf, "0x%08x\n", be32_to_cpu(dcr->serial_number));
1518 }
1519 static DEVICE_ATTR_RO(serial);
1520
1521 static ssize_t family_show(struct device *dev,
1522                 struct device_attribute *attr, char *buf)
1523 {
1524         struct nvdimm *nvdimm = to_nvdimm(dev);
1525         struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
1526
1527         if (nfit_mem->family < 0)
1528                 return -ENXIO;
1529         return sprintf(buf, "%d\n", nfit_mem->family);
1530 }
1531 static DEVICE_ATTR_RO(family);
1532
1533 static ssize_t dsm_mask_show(struct device *dev,
1534                 struct device_attribute *attr, char *buf)
1535 {
1536         struct nvdimm *nvdimm = to_nvdimm(dev);
1537         struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
1538
1539         if (nfit_mem->family < 0)
1540                 return -ENXIO;
1541         return sprintf(buf, "%#lx\n", nfit_mem->dsm_mask);
1542 }
1543 static DEVICE_ATTR_RO(dsm_mask);
1544
1545 static ssize_t flags_show(struct device *dev,
1546                 struct device_attribute *attr, char *buf)
1547 {
1548         u16 flags = to_nfit_memdev(dev)->flags;
1549
1550         return sprintf(buf, "%s%s%s%s%s%s%s\n",
1551                 flags & ACPI_NFIT_MEM_SAVE_FAILED ? "save_fail " : "",
1552                 flags & ACPI_NFIT_MEM_RESTORE_FAILED ? "restore_fail " : "",
1553                 flags & ACPI_NFIT_MEM_FLUSH_FAILED ? "flush_fail " : "",
1554                 flags & ACPI_NFIT_MEM_NOT_ARMED ? "not_armed " : "",
1555                 flags & ACPI_NFIT_MEM_HEALTH_OBSERVED ? "smart_event " : "",
1556                 flags & ACPI_NFIT_MEM_MAP_FAILED ? "map_fail " : "",
1557                 flags & ACPI_NFIT_MEM_HEALTH_ENABLED ? "smart_notify " : "");
1558 }
1559 static DEVICE_ATTR_RO(flags);
1560
1561 static ssize_t id_show(struct device *dev,
1562                 struct device_attribute *attr, char *buf)
1563 {
1564         struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev);
1565
1566         if (dcr->valid_fields & ACPI_NFIT_CONTROL_MFG_INFO_VALID)
1567                 return sprintf(buf, "%04x-%02x-%04x-%08x\n",
1568                                 be16_to_cpu(dcr->vendor_id),
1569                                 dcr->manufacturing_location,
1570                                 be16_to_cpu(dcr->manufacturing_date),
1571                                 be32_to_cpu(dcr->serial_number));
1572         else
1573                 return sprintf(buf, "%04x-%08x\n",
1574                                 be16_to_cpu(dcr->vendor_id),
1575                                 be32_to_cpu(dcr->serial_number));
1576 }
1577 static DEVICE_ATTR_RO(id);
1578
1579 static struct attribute *acpi_nfit_dimm_attributes[] = {
1580         &dev_attr_handle.attr,
1581         &dev_attr_phys_id.attr,
1582         &dev_attr_vendor.attr,
1583         &dev_attr_device.attr,
1584         &dev_attr_rev_id.attr,
1585         &dev_attr_subsystem_vendor.attr,
1586         &dev_attr_subsystem_device.attr,
1587         &dev_attr_subsystem_rev_id.attr,
1588         &dev_attr_format.attr,
1589         &dev_attr_formats.attr,
1590         &dev_attr_format1.attr,
1591         &dev_attr_serial.attr,
1592         &dev_attr_flags.attr,
1593         &dev_attr_id.attr,
1594         &dev_attr_family.attr,
1595         &dev_attr_dsm_mask.attr,
1596         NULL,
1597 };
1598
1599 static umode_t acpi_nfit_dimm_attr_visible(struct kobject *kobj,
1600                 struct attribute *a, int n)
1601 {
1602         struct device *dev = container_of(kobj, struct device, kobj);
1603         struct nvdimm *nvdimm = to_nvdimm(dev);
1604
1605         if (!to_nfit_dcr(dev)) {
1606                 /* Without a dcr only the memdev attributes can be surfaced */
1607                 if (a == &dev_attr_handle.attr || a == &dev_attr_phys_id.attr
1608                                 || a == &dev_attr_flags.attr
1609                                 || a == &dev_attr_family.attr
1610                                 || a == &dev_attr_dsm_mask.attr)
1611                         return a->mode;
1612                 return 0;
1613         }
1614
1615         if (a == &dev_attr_format1.attr && num_nvdimm_formats(nvdimm) <= 1)
1616                 return 0;
1617         return a->mode;
1618 }
1619
1620 static const struct attribute_group acpi_nfit_dimm_attribute_group = {
1621         .name = "nfit",
1622         .attrs = acpi_nfit_dimm_attributes,
1623         .is_visible = acpi_nfit_dimm_attr_visible,
1624 };
1625
1626 static const struct attribute_group *acpi_nfit_dimm_attribute_groups[] = {
1627         &nvdimm_attribute_group,
1628         &nd_device_attribute_group,
1629         &acpi_nfit_dimm_attribute_group,
1630         NULL,
1631 };
1632
1633 static struct nvdimm *acpi_nfit_dimm_by_handle(struct acpi_nfit_desc *acpi_desc,
1634                 u32 device_handle)
1635 {
1636         struct nfit_mem *nfit_mem;
1637
1638         list_for_each_entry(nfit_mem, &acpi_desc->dimms, list)
1639                 if (__to_nfit_memdev(nfit_mem)->device_handle == device_handle)
1640                         return nfit_mem->nvdimm;
1641
1642         return NULL;
1643 }
1644
1645 void __acpi_nvdimm_notify(struct device *dev, u32 event)
1646 {
1647         struct nfit_mem *nfit_mem;
1648         struct acpi_nfit_desc *acpi_desc;
1649
1650         dev_dbg(dev->parent, "%s: event: %d\n", dev_name(dev),
1651                         event);
1652
1653         if (event != NFIT_NOTIFY_DIMM_HEALTH) {
1654                 dev_dbg(dev->parent, "%s: unknown event: %d\n", dev_name(dev),
1655                                 event);
1656                 return;
1657         }
1658
1659         acpi_desc = dev_get_drvdata(dev->parent);
1660         if (!acpi_desc)
1661                 return;
1662
1663         /*
1664          * If we successfully retrieved acpi_desc, then we know nfit_mem data
1665          * is still valid.
1666          */
1667         nfit_mem = dev_get_drvdata(dev);
1668         if (nfit_mem && nfit_mem->flags_attr)
1669                 sysfs_notify_dirent(nfit_mem->flags_attr);
1670 }
1671 EXPORT_SYMBOL_GPL(__acpi_nvdimm_notify);
1672
1673 static void acpi_nvdimm_notify(acpi_handle handle, u32 event, void *data)
1674 {
1675         struct acpi_device *adev = data;
1676         struct device *dev = &adev->dev;
1677
1678         device_lock(dev->parent);
1679         __acpi_nvdimm_notify(dev, event);
1680         device_unlock(dev->parent);
1681 }
1682
1683 static bool acpi_nvdimm_has_method(struct acpi_device *adev, char *method)
1684 {
1685         acpi_handle handle;
1686         acpi_status status;
1687
1688         status = acpi_get_handle(adev->handle, method, &handle);
1689
1690         if (ACPI_SUCCESS(status))
1691                 return true;
1692         return false;
1693 }
1694
1695 static int acpi_nfit_add_dimm(struct acpi_nfit_desc *acpi_desc,
1696                 struct nfit_mem *nfit_mem, u32 device_handle)
1697 {
1698         struct acpi_device *adev, *adev_dimm;
1699         struct device *dev = acpi_desc->dev;
1700         unsigned long dsm_mask;
1701         const guid_t *guid;
1702         int i;
1703         int family = -1;
1704
1705         /* nfit test assumes 1:1 relationship between commands and dsms */
1706         nfit_mem->dsm_mask = acpi_desc->dimm_cmd_force_en;
1707         nfit_mem->family = NVDIMM_FAMILY_INTEL;
1708         adev = to_acpi_dev(acpi_desc);
1709         if (!adev)
1710                 return 0;
1711
1712         adev_dimm = acpi_find_child_device(adev, device_handle, false);
1713         nfit_mem->adev = adev_dimm;
1714         if (!adev_dimm) {
1715                 dev_err(dev, "no ACPI.NFIT device with _ADR %#x, disabling...\n",
1716                                 device_handle);
1717                 return force_enable_dimms ? 0 : -ENODEV;
1718         }
1719
1720         if (ACPI_FAILURE(acpi_install_notify_handler(adev_dimm->handle,
1721                 ACPI_DEVICE_NOTIFY, acpi_nvdimm_notify, adev_dimm))) {
1722                 dev_err(dev, "%s: notification registration failed\n",
1723                                 dev_name(&adev_dimm->dev));
1724                 return -ENXIO;
1725         }
1726         /*
1727          * Record nfit_mem for the notification path to track back to
1728          * the nfit sysfs attributes for this dimm device object.
1729          */
1730         dev_set_drvdata(&adev_dimm->dev, nfit_mem);
1731
1732         /*
1733          * Until standardization materializes we need to consider 4
1734          * different command sets.  Note, that checking for function0 (bit0)
1735          * tells us if any commands are reachable through this GUID.
1736          */
1737         for (i = 0; i <= NVDIMM_FAMILY_MAX; i++)
1738                 if (acpi_check_dsm(adev_dimm->handle, to_nfit_uuid(i), 1, 1))
1739                         if (family < 0 || i == default_dsm_family)
1740                                 family = i;
1741
1742         /* limit the supported commands to those that are publicly documented */
1743         nfit_mem->family = family;
1744         if (override_dsm_mask && !disable_vendor_specific)
1745                 dsm_mask = override_dsm_mask;
1746         else if (nfit_mem->family == NVDIMM_FAMILY_INTEL) {
1747                 dsm_mask = NVDIMM_INTEL_CMDMASK;
1748                 if (disable_vendor_specific)
1749                         dsm_mask &= ~(1 << ND_CMD_VENDOR);
1750         } else if (nfit_mem->family == NVDIMM_FAMILY_HPE1) {
1751                 dsm_mask = 0x1c3c76;
1752         } else if (nfit_mem->family == NVDIMM_FAMILY_HPE2) {
1753                 dsm_mask = 0x1fe;
1754                 if (disable_vendor_specific)
1755                         dsm_mask &= ~(1 << 8);
1756         } else if (nfit_mem->family == NVDIMM_FAMILY_MSFT) {
1757                 dsm_mask = 0xffffffff;
1758         } else {
1759                 dev_dbg(dev, "unknown dimm command family\n");
1760                 nfit_mem->family = -1;
1761                 /* DSMs are optional, continue loading the driver... */
1762                 return 0;
1763         }
1764
1765         guid = to_nfit_uuid(nfit_mem->family);
1766         for_each_set_bit(i, &dsm_mask, BITS_PER_LONG)
1767                 if (acpi_check_dsm(adev_dimm->handle, guid,
1768                                         nfit_dsm_revid(nfit_mem->family, i),
1769                                         1ULL << i))
1770                         set_bit(i, &nfit_mem->dsm_mask);
1771
1772         if (acpi_nvdimm_has_method(adev_dimm, "_LSI")
1773                         && acpi_nvdimm_has_method(adev_dimm, "_LSR")) {
1774                 dev_dbg(dev, "%s: has _LSR\n", dev_name(&adev_dimm->dev));
1775                 nfit_mem->has_lsr = true;
1776         }
1777
1778         if (nfit_mem->has_lsr && acpi_nvdimm_has_method(adev_dimm, "_LSW")) {
1779                 dev_dbg(dev, "%s: has _LSW\n", dev_name(&adev_dimm->dev));
1780                 nfit_mem->has_lsw = true;
1781         }
1782
1783         return 0;
1784 }
1785
1786 static void shutdown_dimm_notify(void *data)
1787 {
1788         struct acpi_nfit_desc *acpi_desc = data;
1789         struct nfit_mem *nfit_mem;
1790
1791         mutex_lock(&acpi_desc->init_mutex);
1792         /*
1793          * Clear out the nfit_mem->flags_attr and shut down dimm event
1794          * notifications.
1795          */
1796         list_for_each_entry(nfit_mem, &acpi_desc->dimms, list) {
1797                 struct acpi_device *adev_dimm = nfit_mem->adev;
1798
1799                 if (nfit_mem->flags_attr) {
1800                         sysfs_put(nfit_mem->flags_attr);
1801                         nfit_mem->flags_attr = NULL;
1802                 }
1803                 if (adev_dimm) {
1804                         acpi_remove_notify_handler(adev_dimm->handle,
1805                                         ACPI_DEVICE_NOTIFY, acpi_nvdimm_notify);
1806                         dev_set_drvdata(&adev_dimm->dev, NULL);
1807                 }
1808         }
1809         mutex_unlock(&acpi_desc->init_mutex);
1810 }
1811
1812 static int acpi_nfit_register_dimms(struct acpi_nfit_desc *acpi_desc)
1813 {
1814         struct nfit_mem *nfit_mem;
1815         int dimm_count = 0, rc;
1816         struct nvdimm *nvdimm;
1817
1818         list_for_each_entry(nfit_mem, &acpi_desc->dimms, list) {
1819                 struct acpi_nfit_flush_address *flush;
1820                 unsigned long flags = 0, cmd_mask;
1821                 struct nfit_memdev *nfit_memdev;
1822                 u32 device_handle;
1823                 u16 mem_flags;
1824
1825                 device_handle = __to_nfit_memdev(nfit_mem)->device_handle;
1826                 nvdimm = acpi_nfit_dimm_by_handle(acpi_desc, device_handle);
1827                 if (nvdimm) {
1828                         dimm_count++;
1829                         continue;
1830                 }
1831
1832                 if (nfit_mem->bdw && nfit_mem->memdev_pmem)
1833                         set_bit(NDD_ALIASING, &flags);
1834
1835                 /* collate flags across all memdevs for this dimm */
1836                 list_for_each_entry(nfit_memdev, &acpi_desc->memdevs, list) {
1837                         struct acpi_nfit_memory_map *dimm_memdev;
1838
1839                         dimm_memdev = __to_nfit_memdev(nfit_mem);
1840                         if (dimm_memdev->device_handle
1841                                         != nfit_memdev->memdev->device_handle)
1842                                 continue;
1843                         dimm_memdev->flags |= nfit_memdev->memdev->flags;
1844                 }
1845
1846                 mem_flags = __to_nfit_memdev(nfit_mem)->flags;
1847                 if (mem_flags & ACPI_NFIT_MEM_NOT_ARMED)
1848                         set_bit(NDD_UNARMED, &flags);
1849
1850                 rc = acpi_nfit_add_dimm(acpi_desc, nfit_mem, device_handle);
1851                 if (rc)
1852                         continue;
1853
1854                 /*
1855                  * TODO: provide translation for non-NVDIMM_FAMILY_INTEL
1856                  * devices (i.e. from nd_cmd to acpi_dsm) to standardize the
1857                  * userspace interface.
1858                  */
1859                 cmd_mask = 1UL << ND_CMD_CALL;
1860                 if (nfit_mem->family == NVDIMM_FAMILY_INTEL) {
1861                         /*
1862                          * These commands have a 1:1 correspondence
1863                          * between DSM payload and libnvdimm ioctl
1864                          * payload format.
1865                          */
1866                         cmd_mask |= nfit_mem->dsm_mask & NVDIMM_STANDARD_CMDMASK;
1867                 }
1868
1869                 if (nfit_mem->has_lsr) {
1870                         set_bit(ND_CMD_GET_CONFIG_SIZE, &cmd_mask);
1871                         set_bit(ND_CMD_GET_CONFIG_DATA, &cmd_mask);
1872                 }
1873                 if (nfit_mem->has_lsw)
1874                         set_bit(ND_CMD_SET_CONFIG_DATA, &cmd_mask);
1875
1876                 flush = nfit_mem->nfit_flush ? nfit_mem->nfit_flush->flush
1877                         : NULL;
1878                 nvdimm = nvdimm_create(acpi_desc->nvdimm_bus, nfit_mem,
1879                                 acpi_nfit_dimm_attribute_groups,
1880                                 flags, cmd_mask, flush ? flush->hint_count : 0,
1881                                 nfit_mem->flush_wpq);
1882                 if (!nvdimm)
1883                         return -ENOMEM;
1884
1885                 nfit_mem->nvdimm = nvdimm;
1886                 dimm_count++;
1887
1888                 if ((mem_flags & ACPI_NFIT_MEM_FAILED_MASK) == 0)
1889                         continue;
1890
1891                 dev_info(acpi_desc->dev, "%s flags:%s%s%s%s%s\n",
1892                                 nvdimm_name(nvdimm),
1893                   mem_flags & ACPI_NFIT_MEM_SAVE_FAILED ? " save_fail" : "",
1894                   mem_flags & ACPI_NFIT_MEM_RESTORE_FAILED ? " restore_fail":"",
1895                   mem_flags & ACPI_NFIT_MEM_FLUSH_FAILED ? " flush_fail" : "",
1896                   mem_flags & ACPI_NFIT_MEM_NOT_ARMED ? " not_armed" : "",
1897                   mem_flags & ACPI_NFIT_MEM_MAP_FAILED ? " map_fail" : "");
1898
1899         }
1900
1901         rc = nvdimm_bus_check_dimm_count(acpi_desc->nvdimm_bus, dimm_count);
1902         if (rc)
1903                 return rc;
1904
1905         /*
1906          * Now that dimms are successfully registered, and async registration
1907          * is flushed, attempt to enable event notification.
1908          */
1909         list_for_each_entry(nfit_mem, &acpi_desc->dimms, list) {
1910                 struct kernfs_node *nfit_kernfs;
1911
1912                 nvdimm = nfit_mem->nvdimm;
1913                 if (!nvdimm)
1914                         continue;
1915
1916                 nfit_kernfs = sysfs_get_dirent(nvdimm_kobj(nvdimm)->sd, "nfit");
1917                 if (nfit_kernfs)
1918                         nfit_mem->flags_attr = sysfs_get_dirent(nfit_kernfs,
1919                                         "flags");
1920                 sysfs_put(nfit_kernfs);
1921                 if (!nfit_mem->flags_attr)
1922                         dev_warn(acpi_desc->dev, "%s: notifications disabled\n",
1923                                         nvdimm_name(nvdimm));
1924         }
1925
1926         return devm_add_action_or_reset(acpi_desc->dev, shutdown_dimm_notify,
1927                         acpi_desc);
1928 }
1929
1930 /*
1931  * These constants are private because there are no kernel consumers of
1932  * these commands.
1933  */
1934 enum nfit_aux_cmds {
1935         NFIT_CMD_TRANSLATE_SPA = 5,
1936         NFIT_CMD_ARS_INJECT_SET = 7,
1937         NFIT_CMD_ARS_INJECT_CLEAR = 8,
1938         NFIT_CMD_ARS_INJECT_GET = 9,
1939 };
1940
1941 static void acpi_nfit_init_dsms(struct acpi_nfit_desc *acpi_desc)
1942 {
1943         struct nvdimm_bus_descriptor *nd_desc = &acpi_desc->nd_desc;
1944         const guid_t *guid = to_nfit_uuid(NFIT_DEV_BUS);
1945         struct acpi_device *adev;
1946         unsigned long dsm_mask;
1947         int i;
1948
1949         nd_desc->cmd_mask = acpi_desc->bus_cmd_force_en;
1950         nd_desc->bus_dsm_mask = acpi_desc->bus_nfit_cmd_force_en;
1951         adev = to_acpi_dev(acpi_desc);
1952         if (!adev)
1953                 return;
1954
1955         for (i = ND_CMD_ARS_CAP; i <= ND_CMD_CLEAR_ERROR; i++)
1956                 if (acpi_check_dsm(adev->handle, guid, 1, 1ULL << i))
1957                         set_bit(i, &nd_desc->cmd_mask);
1958         set_bit(ND_CMD_CALL, &nd_desc->cmd_mask);
1959
1960         dsm_mask =
1961                 (1 << ND_CMD_ARS_CAP) |
1962                 (1 << ND_CMD_ARS_START) |
1963                 (1 << ND_CMD_ARS_STATUS) |
1964                 (1 << ND_CMD_CLEAR_ERROR) |
1965                 (1 << NFIT_CMD_TRANSLATE_SPA) |
1966                 (1 << NFIT_CMD_ARS_INJECT_SET) |
1967                 (1 << NFIT_CMD_ARS_INJECT_CLEAR) |
1968                 (1 << NFIT_CMD_ARS_INJECT_GET);
1969         for_each_set_bit(i, &dsm_mask, BITS_PER_LONG)
1970                 if (acpi_check_dsm(adev->handle, guid, 1, 1ULL << i))
1971                         set_bit(i, &nd_desc->bus_dsm_mask);
1972 }
1973
1974 static ssize_t range_index_show(struct device *dev,
1975                 struct device_attribute *attr, char *buf)
1976 {
1977         struct nd_region *nd_region = to_nd_region(dev);
1978         struct nfit_spa *nfit_spa = nd_region_provider_data(nd_region);
1979
1980         return sprintf(buf, "%d\n", nfit_spa->spa->range_index);
1981 }
1982 static DEVICE_ATTR_RO(range_index);
1983
1984 static struct attribute *acpi_nfit_region_attributes[] = {
1985         &dev_attr_range_index.attr,
1986         NULL,
1987 };
1988
1989 static const struct attribute_group acpi_nfit_region_attribute_group = {
1990         .name = "nfit",
1991         .attrs = acpi_nfit_region_attributes,
1992 };
1993
1994 static const struct attribute_group *acpi_nfit_region_attribute_groups[] = {
1995         &nd_region_attribute_group,
1996         &nd_mapping_attribute_group,
1997         &nd_device_attribute_group,
1998         &nd_numa_attribute_group,
1999         &acpi_nfit_region_attribute_group,
2000         NULL,
2001 };
2002
2003 /* enough info to uniquely specify an interleave set */
2004 struct nfit_set_info {
2005         struct nfit_set_info_map {
2006                 u64 region_offset;
2007                 u32 serial_number;
2008                 u32 pad;
2009         } mapping[0];
2010 };
2011
2012 struct nfit_set_info2 {
2013         struct nfit_set_info_map2 {
2014                 u64 region_offset;
2015                 u32 serial_number;
2016                 u16 vendor_id;
2017                 u16 manufacturing_date;
2018                 u8  manufacturing_location;
2019                 u8  reserved[31];
2020         } mapping[0];
2021 };
2022
2023 static size_t sizeof_nfit_set_info(int num_mappings)
2024 {
2025         return sizeof(struct nfit_set_info)
2026                 + num_mappings * sizeof(struct nfit_set_info_map);
2027 }
2028
2029 static size_t sizeof_nfit_set_info2(int num_mappings)
2030 {
2031         return sizeof(struct nfit_set_info2)
2032                 + num_mappings * sizeof(struct nfit_set_info_map2);
2033 }
2034
2035 static int cmp_map_compat(const void *m0, const void *m1)
2036 {
2037         const struct nfit_set_info_map *map0 = m0;
2038         const struct nfit_set_info_map *map1 = m1;
2039
2040         return memcmp(&map0->region_offset, &map1->region_offset,
2041                         sizeof(u64));
2042 }
2043
2044 static int cmp_map(const void *m0, const void *m1)
2045 {
2046         const struct nfit_set_info_map *map0 = m0;
2047         const struct nfit_set_info_map *map1 = m1;
2048
2049         if (map0->region_offset < map1->region_offset)
2050                 return -1;
2051         else if (map0->region_offset > map1->region_offset)
2052                 return 1;
2053         return 0;
2054 }
2055
2056 static int cmp_map2(const void *m0, const void *m1)
2057 {
2058         const struct nfit_set_info_map2 *map0 = m0;
2059         const struct nfit_set_info_map2 *map1 = m1;
2060
2061         if (map0->region_offset < map1->region_offset)
2062                 return -1;
2063         else if (map0->region_offset > map1->region_offset)
2064                 return 1;
2065         return 0;
2066 }
2067
2068 /* Retrieve the nth entry referencing this spa */
2069 static struct acpi_nfit_memory_map *memdev_from_spa(
2070                 struct acpi_nfit_desc *acpi_desc, u16 range_index, int n)
2071 {
2072         struct nfit_memdev *nfit_memdev;
2073
2074         list_for_each_entry(nfit_memdev, &acpi_desc->memdevs, list)
2075                 if (nfit_memdev->memdev->range_index == range_index)
2076                         if (n-- == 0)
2077                                 return nfit_memdev->memdev;
2078         return NULL;
2079 }
2080
2081 static int acpi_nfit_init_interleave_set(struct acpi_nfit_desc *acpi_desc,
2082                 struct nd_region_desc *ndr_desc,
2083                 struct acpi_nfit_system_address *spa)
2084 {
2085         struct device *dev = acpi_desc->dev;
2086         struct nd_interleave_set *nd_set;
2087         u16 nr = ndr_desc->num_mappings;
2088         struct nfit_set_info2 *info2;
2089         struct nfit_set_info *info;
2090         int i;
2091
2092         nd_set = devm_kzalloc(dev, sizeof(*nd_set), GFP_KERNEL);
2093         if (!nd_set)
2094                 return -ENOMEM;
2095         ndr_desc->nd_set = nd_set;
2096         guid_copy(&nd_set->type_guid, (guid_t *) spa->range_guid);
2097
2098         info = devm_kzalloc(dev, sizeof_nfit_set_info(nr), GFP_KERNEL);
2099         if (!info)
2100                 return -ENOMEM;
2101
2102         info2 = devm_kzalloc(dev, sizeof_nfit_set_info2(nr), GFP_KERNEL);
2103         if (!info2)
2104                 return -ENOMEM;
2105
2106         for (i = 0; i < nr; i++) {
2107                 struct nd_mapping_desc *mapping = &ndr_desc->mapping[i];
2108                 struct nfit_set_info_map *map = &info->mapping[i];
2109                 struct nfit_set_info_map2 *map2 = &info2->mapping[i];
2110                 struct nvdimm *nvdimm = mapping->nvdimm;
2111                 struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
2112                 struct acpi_nfit_memory_map *memdev = memdev_from_spa(acpi_desc,
2113                                 spa->range_index, i);
2114                 struct acpi_nfit_control_region *dcr = nfit_mem->dcr;
2115
2116                 if (!memdev || !nfit_mem->dcr) {
2117                         dev_err(dev, "%s: failed to find DCR\n", __func__);
2118                         return -ENODEV;
2119                 }
2120
2121                 map->region_offset = memdev->region_offset;
2122                 map->serial_number = dcr->serial_number;
2123
2124                 map2->region_offset = memdev->region_offset;
2125                 map2->serial_number = dcr->serial_number;
2126                 map2->vendor_id = dcr->vendor_id;
2127                 map2->manufacturing_date = dcr->manufacturing_date;
2128                 map2->manufacturing_location = dcr->manufacturing_location;
2129         }
2130
2131         /* v1.1 namespaces */
2132         sort(&info->mapping[0], nr, sizeof(struct nfit_set_info_map),
2133                         cmp_map, NULL);
2134         nd_set->cookie1 = nd_fletcher64(info, sizeof_nfit_set_info(nr), 0);
2135
2136         /* v1.2 namespaces */
2137         sort(&info2->mapping[0], nr, sizeof(struct nfit_set_info_map2),
2138                         cmp_map2, NULL);
2139         nd_set->cookie2 = nd_fletcher64(info2, sizeof_nfit_set_info2(nr), 0);
2140
2141         /* support v1.1 namespaces created with the wrong sort order */
2142         sort(&info->mapping[0], nr, sizeof(struct nfit_set_info_map),
2143                         cmp_map_compat, NULL);
2144         nd_set->altcookie = nd_fletcher64(info, sizeof_nfit_set_info(nr), 0);
2145
2146         /* record the result of the sort for the mapping position */
2147         for (i = 0; i < nr; i++) {
2148                 struct nfit_set_info_map2 *map2 = &info2->mapping[i];
2149                 int j;
2150
2151                 for (j = 0; j < nr; j++) {
2152                         struct nd_mapping_desc *mapping = &ndr_desc->mapping[j];
2153                         struct nvdimm *nvdimm = mapping->nvdimm;
2154                         struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
2155                         struct acpi_nfit_control_region *dcr = nfit_mem->dcr;
2156
2157                         if (map2->serial_number == dcr->serial_number &&
2158                             map2->vendor_id == dcr->vendor_id &&
2159                             map2->manufacturing_date == dcr->manufacturing_date &&
2160                             map2->manufacturing_location
2161                                     == dcr->manufacturing_location) {
2162                                 mapping->position = i;
2163                                 break;
2164                         }
2165                 }
2166         }
2167
2168         ndr_desc->nd_set = nd_set;
2169         devm_kfree(dev, info);
2170         devm_kfree(dev, info2);
2171
2172         return 0;
2173 }
2174
2175 static u64 to_interleave_offset(u64 offset, struct nfit_blk_mmio *mmio)
2176 {
2177         struct acpi_nfit_interleave *idt = mmio->idt;
2178         u32 sub_line_offset, line_index, line_offset;
2179         u64 line_no, table_skip_count, table_offset;
2180
2181         line_no = div_u64_rem(offset, mmio->line_size, &sub_line_offset);
2182         table_skip_count = div_u64_rem(line_no, mmio->num_lines, &line_index);
2183         line_offset = idt->line_offset[line_index]
2184                 * mmio->line_size;
2185         table_offset = table_skip_count * mmio->table_size;
2186
2187         return mmio->base_offset + line_offset + table_offset + sub_line_offset;
2188 }
2189
2190 static u32 read_blk_stat(struct nfit_blk *nfit_blk, unsigned int bw)
2191 {
2192         struct nfit_blk_mmio *mmio = &nfit_blk->mmio[DCR];
2193         u64 offset = nfit_blk->stat_offset + mmio->size * bw;
2194         const u32 STATUS_MASK = 0x80000037;
2195
2196         if (mmio->num_lines)
2197                 offset = to_interleave_offset(offset, mmio);
2198
2199         return readl(mmio->addr.base + offset) & STATUS_MASK;
2200 }
2201
2202 static void write_blk_ctl(struct nfit_blk *nfit_blk, unsigned int bw,
2203                 resource_size_t dpa, unsigned int len, unsigned int write)
2204 {
2205         u64 cmd, offset;
2206         struct nfit_blk_mmio *mmio = &nfit_blk->mmio[DCR];
2207
2208         enum {
2209                 BCW_OFFSET_MASK = (1ULL << 48)-1,
2210                 BCW_LEN_SHIFT = 48,
2211                 BCW_LEN_MASK = (1ULL << 8) - 1,
2212                 BCW_CMD_SHIFT = 56,
2213         };
2214
2215         cmd = (dpa >> L1_CACHE_SHIFT) & BCW_OFFSET_MASK;
2216         len = len >> L1_CACHE_SHIFT;
2217         cmd |= ((u64) len & BCW_LEN_MASK) << BCW_LEN_SHIFT;
2218         cmd |= ((u64) write) << BCW_CMD_SHIFT;
2219
2220         offset = nfit_blk->cmd_offset + mmio->size * bw;
2221         if (mmio->num_lines)
2222                 offset = to_interleave_offset(offset, mmio);
2223
2224         writeq(cmd, mmio->addr.base + offset);
2225         nvdimm_flush(nfit_blk->nd_region);
2226
2227         if (nfit_blk->dimm_flags & NFIT_BLK_DCR_LATCH)
2228                 readq(mmio->addr.base + offset);
2229 }
2230
2231 static int acpi_nfit_blk_single_io(struct nfit_blk *nfit_blk,
2232                 resource_size_t dpa, void *iobuf, size_t len, int rw,
2233                 unsigned int lane)
2234 {
2235         struct nfit_blk_mmio *mmio = &nfit_blk->mmio[BDW];
2236         unsigned int copied = 0;
2237         u64 base_offset;
2238         int rc;
2239
2240         base_offset = nfit_blk->bdw_offset + dpa % L1_CACHE_BYTES
2241                 + lane * mmio->size;
2242         write_blk_ctl(nfit_blk, lane, dpa, len, rw);
2243         while (len) {
2244                 unsigned int c;
2245                 u64 offset;
2246
2247                 if (mmio->num_lines) {
2248                         u32 line_offset;
2249
2250                         offset = to_interleave_offset(base_offset + copied,
2251                                         mmio);
2252                         div_u64_rem(offset, mmio->line_size, &line_offset);
2253                         c = min_t(size_t, len, mmio->line_size - line_offset);
2254                 } else {
2255                         offset = base_offset + nfit_blk->bdw_offset;
2256                         c = len;
2257                 }
2258
2259                 if (rw)
2260                         memcpy_flushcache(mmio->addr.aperture + offset, iobuf + copied, c);
2261                 else {
2262                         if (nfit_blk->dimm_flags & NFIT_BLK_READ_FLUSH)
2263                                 arch_invalidate_pmem((void __force *)
2264                                         mmio->addr.aperture + offset, c);
2265
2266                         memcpy(iobuf + copied, mmio->addr.aperture + offset, c);
2267                 }
2268
2269                 copied += c;
2270                 len -= c;
2271         }
2272
2273         if (rw)
2274                 nvdimm_flush(nfit_blk->nd_region);
2275
2276         rc = read_blk_stat(nfit_blk, lane) ? -EIO : 0;
2277         return rc;
2278 }
2279
2280 static int acpi_nfit_blk_region_do_io(struct nd_blk_region *ndbr,
2281                 resource_size_t dpa, void *iobuf, u64 len, int rw)
2282 {
2283         struct nfit_blk *nfit_blk = nd_blk_region_provider_data(ndbr);
2284         struct nfit_blk_mmio *mmio = &nfit_blk->mmio[BDW];
2285         struct nd_region *nd_region = nfit_blk->nd_region;
2286         unsigned int lane, copied = 0;
2287         int rc = 0;
2288
2289         lane = nd_region_acquire_lane(nd_region);
2290         while (len) {
2291                 u64 c = min(len, mmio->size);
2292
2293                 rc = acpi_nfit_blk_single_io(nfit_blk, dpa + copied,
2294                                 iobuf + copied, c, rw, lane);
2295                 if (rc)
2296                         break;
2297
2298                 copied += c;
2299                 len -= c;
2300         }
2301         nd_region_release_lane(nd_region, lane);
2302
2303         return rc;
2304 }
2305
2306 static int nfit_blk_init_interleave(struct nfit_blk_mmio *mmio,
2307                 struct acpi_nfit_interleave *idt, u16 interleave_ways)
2308 {
2309         if (idt) {
2310                 mmio->num_lines = idt->line_count;
2311                 mmio->line_size = idt->line_size;
2312                 if (interleave_ways == 0)
2313                         return -ENXIO;
2314                 mmio->table_size = mmio->num_lines * interleave_ways
2315                         * mmio->line_size;
2316         }
2317
2318         return 0;
2319 }
2320
2321 static int acpi_nfit_blk_get_flags(struct nvdimm_bus_descriptor *nd_desc,
2322                 struct nvdimm *nvdimm, struct nfit_blk *nfit_blk)
2323 {
2324         struct nd_cmd_dimm_flags flags;
2325         int rc;
2326
2327         memset(&flags, 0, sizeof(flags));
2328         rc = nd_desc->ndctl(nd_desc, nvdimm, ND_CMD_DIMM_FLAGS, &flags,
2329                         sizeof(flags), NULL);
2330
2331         if (rc >= 0 && flags.status == 0)
2332                 nfit_blk->dimm_flags = flags.flags;
2333         else if (rc == -ENOTTY) {
2334                 /* fall back to a conservative default */
2335                 nfit_blk->dimm_flags = NFIT_BLK_DCR_LATCH | NFIT_BLK_READ_FLUSH;
2336                 rc = 0;
2337         } else
2338                 rc = -ENXIO;
2339
2340         return rc;
2341 }
2342
2343 static int acpi_nfit_blk_region_enable(struct nvdimm_bus *nvdimm_bus,
2344                 struct device *dev)
2345 {
2346         struct nvdimm_bus_descriptor *nd_desc = to_nd_desc(nvdimm_bus);
2347         struct nd_blk_region *ndbr = to_nd_blk_region(dev);
2348         struct nfit_blk_mmio *mmio;
2349         struct nfit_blk *nfit_blk;
2350         struct nfit_mem *nfit_mem;
2351         struct nvdimm *nvdimm;
2352         int rc;
2353
2354         nvdimm = nd_blk_region_to_dimm(ndbr);
2355         nfit_mem = nvdimm_provider_data(nvdimm);
2356         if (!nfit_mem || !nfit_mem->dcr || !nfit_mem->bdw) {
2357                 dev_dbg(dev, "missing%s%s%s\n",
2358                                 nfit_mem ? "" : " nfit_mem",
2359                                 (nfit_mem && nfit_mem->dcr) ? "" : " dcr",
2360                                 (nfit_mem && nfit_mem->bdw) ? "" : " bdw");
2361                 return -ENXIO;
2362         }
2363
2364         nfit_blk = devm_kzalloc(dev, sizeof(*nfit_blk), GFP_KERNEL);
2365         if (!nfit_blk)
2366                 return -ENOMEM;
2367         nd_blk_region_set_provider_data(ndbr, nfit_blk);
2368         nfit_blk->nd_region = to_nd_region(dev);
2369
2370         /* map block aperture memory */
2371         nfit_blk->bdw_offset = nfit_mem->bdw->offset;
2372         mmio = &nfit_blk->mmio[BDW];
2373         mmio->addr.base = devm_nvdimm_memremap(dev, nfit_mem->spa_bdw->address,
2374                         nfit_mem->spa_bdw->length, nd_blk_memremap_flags(ndbr));
2375         if (!mmio->addr.base) {
2376                 dev_dbg(dev, "%s failed to map bdw\n",
2377                                 nvdimm_name(nvdimm));
2378                 return -ENOMEM;
2379         }
2380         mmio->size = nfit_mem->bdw->size;
2381         mmio->base_offset = nfit_mem->memdev_bdw->region_offset;
2382         mmio->idt = nfit_mem->idt_bdw;
2383         mmio->spa = nfit_mem->spa_bdw;
2384         rc = nfit_blk_init_interleave(mmio, nfit_mem->idt_bdw,
2385                         nfit_mem->memdev_bdw->interleave_ways);
2386         if (rc) {
2387                 dev_dbg(dev, "%s failed to init bdw interleave\n",
2388                                 nvdimm_name(nvdimm));
2389                 return rc;
2390         }
2391
2392         /* map block control memory */
2393         nfit_blk->cmd_offset = nfit_mem->dcr->command_offset;
2394         nfit_blk->stat_offset = nfit_mem->dcr->status_offset;
2395         mmio = &nfit_blk->mmio[DCR];
2396         mmio->addr.base = devm_nvdimm_ioremap(dev, nfit_mem->spa_dcr->address,
2397                         nfit_mem->spa_dcr->length);
2398         if (!mmio->addr.base) {
2399                 dev_dbg(dev, "%s failed to map dcr\n",
2400                                 nvdimm_name(nvdimm));
2401                 return -ENOMEM;
2402         }
2403         mmio->size = nfit_mem->dcr->window_size;
2404         mmio->base_offset = nfit_mem->memdev_dcr->region_offset;
2405         mmio->idt = nfit_mem->idt_dcr;
2406         mmio->spa = nfit_mem->spa_dcr;
2407         rc = nfit_blk_init_interleave(mmio, nfit_mem->idt_dcr,
2408                         nfit_mem->memdev_dcr->interleave_ways);
2409         if (rc) {
2410                 dev_dbg(dev, "%s failed to init dcr interleave\n",
2411                                 nvdimm_name(nvdimm));
2412                 return rc;
2413         }
2414
2415         rc = acpi_nfit_blk_get_flags(nd_desc, nvdimm, nfit_blk);
2416         if (rc < 0) {
2417                 dev_dbg(dev, "%s failed get DIMM flags\n",
2418                                 nvdimm_name(nvdimm));
2419                 return rc;
2420         }
2421
2422         if (nvdimm_has_flush(nfit_blk->nd_region) < 0)
2423                 dev_warn(dev, "unable to guarantee persistence of writes\n");
2424
2425         if (mmio->line_size == 0)
2426                 return 0;
2427
2428         if ((u32) nfit_blk->cmd_offset % mmio->line_size
2429                         + 8 > mmio->line_size) {
2430                 dev_dbg(dev, "cmd_offset crosses interleave boundary\n");
2431                 return -ENXIO;
2432         } else if ((u32) nfit_blk->stat_offset % mmio->line_size
2433                         + 8 > mmio->line_size) {
2434                 dev_dbg(dev, "stat_offset crosses interleave boundary\n");
2435                 return -ENXIO;
2436         }
2437
2438         return 0;
2439 }
2440
2441 static int ars_get_cap(struct acpi_nfit_desc *acpi_desc,
2442                 struct nd_cmd_ars_cap *cmd, struct nfit_spa *nfit_spa)
2443 {
2444         struct nvdimm_bus_descriptor *nd_desc = &acpi_desc->nd_desc;
2445         struct acpi_nfit_system_address *spa = nfit_spa->spa;
2446         int cmd_rc, rc;
2447
2448         cmd->address = spa->address;
2449         cmd->length = spa->length;
2450         rc = nd_desc->ndctl(nd_desc, NULL, ND_CMD_ARS_CAP, cmd,
2451                         sizeof(*cmd), &cmd_rc);
2452         if (rc < 0)
2453                 return rc;
2454         return cmd_rc;
2455 }
2456
2457 static int ars_start(struct acpi_nfit_desc *acpi_desc, struct nfit_spa *nfit_spa)
2458 {
2459         int rc;
2460         int cmd_rc;
2461         struct nd_cmd_ars_start ars_start;
2462         struct acpi_nfit_system_address *spa = nfit_spa->spa;
2463         struct nvdimm_bus_descriptor *nd_desc = &acpi_desc->nd_desc;
2464
2465         memset(&ars_start, 0, sizeof(ars_start));
2466         ars_start.address = spa->address;
2467         ars_start.length = spa->length;
2468         if (test_bit(ARS_SHORT, &nfit_spa->ars_state))
2469                 ars_start.flags = ND_ARS_RETURN_PREV_DATA;
2470         if (nfit_spa_type(spa) == NFIT_SPA_PM)
2471                 ars_start.type = ND_ARS_PERSISTENT;
2472         else if (nfit_spa_type(spa) == NFIT_SPA_VOLATILE)
2473                 ars_start.type = ND_ARS_VOLATILE;
2474         else
2475                 return -ENOTTY;
2476
2477         rc = nd_desc->ndctl(nd_desc, NULL, ND_CMD_ARS_START, &ars_start,
2478                         sizeof(ars_start), &cmd_rc);
2479
2480         if (rc < 0)
2481                 return rc;
2482         return cmd_rc;
2483 }
2484
2485 static int ars_continue(struct acpi_nfit_desc *acpi_desc)
2486 {
2487         int rc, cmd_rc;
2488         struct nd_cmd_ars_start ars_start;
2489         struct nvdimm_bus_descriptor *nd_desc = &acpi_desc->nd_desc;
2490         struct nd_cmd_ars_status *ars_status = acpi_desc->ars_status;
2491
2492         memset(&ars_start, 0, sizeof(ars_start));
2493         ars_start.address = ars_status->restart_address;
2494         ars_start.length = ars_status->restart_length;
2495         ars_start.type = ars_status->type;
2496         ars_start.flags = acpi_desc->ars_start_flags;
2497         rc = nd_desc->ndctl(nd_desc, NULL, ND_CMD_ARS_START, &ars_start,
2498                         sizeof(ars_start), &cmd_rc);
2499         if (rc < 0)
2500                 return rc;
2501         return cmd_rc;
2502 }
2503
2504 static int ars_get_status(struct acpi_nfit_desc *acpi_desc)
2505 {
2506         struct nvdimm_bus_descriptor *nd_desc = &acpi_desc->nd_desc;
2507         struct nd_cmd_ars_status *ars_status = acpi_desc->ars_status;
2508         int rc, cmd_rc;
2509
2510         rc = nd_desc->ndctl(nd_desc, NULL, ND_CMD_ARS_STATUS, ars_status,
2511                         acpi_desc->max_ars, &cmd_rc);
2512         if (rc < 0)
2513                 return rc;
2514         return cmd_rc;
2515 }
2516
2517 static void ars_complete(struct acpi_nfit_desc *acpi_desc,
2518                 struct nfit_spa *nfit_spa)
2519 {
2520         struct nd_cmd_ars_status *ars_status = acpi_desc->ars_status;
2521         struct acpi_nfit_system_address *spa = nfit_spa->spa;
2522         struct nd_region *nd_region = nfit_spa->nd_region;
2523         struct device *dev;
2524
2525         if ((ars_status->address >= spa->address && ars_status->address
2526                                 < spa->address + spa->length)
2527                         || (ars_status->address < spa->address)) {
2528                 /*
2529                  * Assume that if a scrub starts at an offset from the
2530                  * start of nfit_spa that we are in the continuation
2531                  * case.
2532                  *
2533                  * Otherwise, if the scrub covers the spa range, mark
2534                  * any pending request complete.
2535                  */
2536                 if (ars_status->address + ars_status->length
2537                                 >= spa->address + spa->length)
2538                                 /* complete */;
2539                 else
2540                         return;
2541         } else
2542                 return;
2543
2544         if (test_bit(ARS_DONE, &nfit_spa->ars_state))
2545                 return;
2546
2547         if (!test_and_clear_bit(ARS_REQ, &nfit_spa->ars_state))
2548                 return;
2549
2550         if (nd_region) {
2551                 dev = nd_region_dev(nd_region);
2552                 nvdimm_region_notify(nd_region, NVDIMM_REVALIDATE_POISON);
2553         } else
2554                 dev = acpi_desc->dev;
2555
2556         dev_dbg(dev, "ARS: range %d %s complete\n", spa->range_index,
2557                         test_bit(ARS_SHORT, &nfit_spa->ars_state)
2558                         ? "short" : "long");
2559         clear_bit(ARS_SHORT, &nfit_spa->ars_state);
2560         set_bit(ARS_DONE, &nfit_spa->ars_state);
2561 }
2562
2563 static int ars_status_process_records(struct acpi_nfit_desc *acpi_desc)
2564 {
2565         struct nvdimm_bus *nvdimm_bus = acpi_desc->nvdimm_bus;
2566         struct nd_cmd_ars_status *ars_status = acpi_desc->ars_status;
2567         int rc;
2568         u32 i;
2569
2570         /*
2571          * First record starts at 44 byte offset from the start of the
2572          * payload.
2573          */
2574         if (ars_status->out_length < 44)
2575                 return 0;
2576         for (i = 0; i < ars_status->num_records; i++) {
2577                 /* only process full records */
2578                 if (ars_status->out_length
2579                                 < 44 + sizeof(struct nd_ars_record) * (i + 1))
2580                         break;
2581                 rc = nvdimm_bus_add_badrange(nvdimm_bus,
2582                                 ars_status->records[i].err_address,
2583                                 ars_status->records[i].length);
2584                 if (rc)
2585                         return rc;
2586         }
2587         if (i < ars_status->num_records)
2588                 dev_warn(acpi_desc->dev, "detected truncated ars results\n");
2589
2590         return 0;
2591 }
2592
2593 static void acpi_nfit_remove_resource(void *data)
2594 {
2595         struct resource *res = data;
2596
2597         remove_resource(res);
2598 }
2599
2600 static int acpi_nfit_insert_resource(struct acpi_nfit_desc *acpi_desc,
2601                 struct nd_region_desc *ndr_desc)
2602 {
2603         struct resource *res, *nd_res = ndr_desc->res;
2604         int is_pmem, ret;
2605
2606         /* No operation if the region is already registered as PMEM */
2607         is_pmem = region_intersects(nd_res->start, resource_size(nd_res),
2608                                 IORESOURCE_MEM, IORES_DESC_PERSISTENT_MEMORY);
2609         if (is_pmem == REGION_INTERSECTS)
2610                 return 0;
2611
2612         res = devm_kzalloc(acpi_desc->dev, sizeof(*res), GFP_KERNEL);
2613         if (!res)
2614                 return -ENOMEM;
2615
2616         res->name = "Persistent Memory";
2617         res->start = nd_res->start;
2618         res->end = nd_res->end;
2619         res->flags = IORESOURCE_MEM;
2620         res->desc = IORES_DESC_PERSISTENT_MEMORY;
2621
2622         ret = insert_resource(&iomem_resource, res);
2623         if (ret)
2624                 return ret;
2625
2626         ret = devm_add_action_or_reset(acpi_desc->dev,
2627                                         acpi_nfit_remove_resource,
2628                                         res);
2629         if (ret)
2630                 return ret;
2631
2632         return 0;
2633 }
2634
2635 static int acpi_nfit_init_mapping(struct acpi_nfit_desc *acpi_desc,
2636                 struct nd_mapping_desc *mapping, struct nd_region_desc *ndr_desc,
2637                 struct acpi_nfit_memory_map *memdev,
2638                 struct nfit_spa *nfit_spa)
2639 {
2640         struct nvdimm *nvdimm = acpi_nfit_dimm_by_handle(acpi_desc,
2641                         memdev->device_handle);
2642         struct acpi_nfit_system_address *spa = nfit_spa->spa;
2643         struct nd_blk_region_desc *ndbr_desc;
2644         struct nfit_mem *nfit_mem;
2645         int rc;
2646
2647         if (!nvdimm) {
2648                 dev_err(acpi_desc->dev, "spa%d dimm: %#x not found\n",
2649                                 spa->range_index, memdev->device_handle);
2650                 return -ENODEV;
2651         }
2652
2653         mapping->nvdimm = nvdimm;
2654         switch (nfit_spa_type(spa)) {
2655         case NFIT_SPA_PM:
2656         case NFIT_SPA_VOLATILE:
2657                 mapping->start = memdev->address;
2658                 mapping->size = memdev->region_size;
2659                 break;
2660         case NFIT_SPA_DCR:
2661                 nfit_mem = nvdimm_provider_data(nvdimm);
2662                 if (!nfit_mem || !nfit_mem->bdw) {
2663                         dev_dbg(acpi_desc->dev, "spa%d %s missing bdw\n",
2664                                         spa->range_index, nvdimm_name(nvdimm));
2665                         break;
2666                 }
2667
2668                 mapping->size = nfit_mem->bdw->capacity;
2669                 mapping->start = nfit_mem->bdw->start_address;
2670                 ndr_desc->num_lanes = nfit_mem->bdw->windows;
2671                 ndr_desc->mapping = mapping;
2672                 ndr_desc->num_mappings = 1;
2673                 ndbr_desc = to_blk_region_desc(ndr_desc);
2674                 ndbr_desc->enable = acpi_nfit_blk_region_enable;
2675                 ndbr_desc->do_io = acpi_desc->blk_do_io;
2676                 rc = acpi_nfit_init_interleave_set(acpi_desc, ndr_desc, spa);
2677                 if (rc)
2678                         return rc;
2679                 nfit_spa->nd_region = nvdimm_blk_region_create(acpi_desc->nvdimm_bus,
2680                                 ndr_desc);
2681                 if (!nfit_spa->nd_region)
2682                         return -ENOMEM;
2683                 break;
2684         }
2685
2686         return 0;
2687 }
2688
2689 static bool nfit_spa_is_virtual(struct acpi_nfit_system_address *spa)
2690 {
2691         return (nfit_spa_type(spa) == NFIT_SPA_VDISK ||
2692                 nfit_spa_type(spa) == NFIT_SPA_VCD   ||
2693                 nfit_spa_type(spa) == NFIT_SPA_PDISK ||
2694                 nfit_spa_type(spa) == NFIT_SPA_PCD);
2695 }
2696
2697 static bool nfit_spa_is_volatile(struct acpi_nfit_system_address *spa)
2698 {
2699         return (nfit_spa_type(spa) == NFIT_SPA_VDISK ||
2700                 nfit_spa_type(spa) == NFIT_SPA_VCD   ||
2701                 nfit_spa_type(spa) == NFIT_SPA_VOLATILE);
2702 }
2703
2704 static int acpi_nfit_register_region(struct acpi_nfit_desc *acpi_desc,
2705                 struct nfit_spa *nfit_spa)
2706 {
2707         static struct nd_mapping_desc mappings[ND_MAX_MAPPINGS];
2708         struct acpi_nfit_system_address *spa = nfit_spa->spa;
2709         struct nd_blk_region_desc ndbr_desc;
2710         struct nd_region_desc *ndr_desc;
2711         struct nfit_memdev *nfit_memdev;
2712         struct nvdimm_bus *nvdimm_bus;
2713         struct resource res;
2714         int count = 0, rc;
2715
2716         if (nfit_spa->nd_region)
2717                 return 0;
2718
2719         if (spa->range_index == 0 && !nfit_spa_is_virtual(spa)) {
2720                 dev_dbg(acpi_desc->dev, "detected invalid spa index\n");
2721                 return 0;
2722         }
2723
2724         memset(&res, 0, sizeof(res));
2725         memset(&mappings, 0, sizeof(mappings));
2726         memset(&ndbr_desc, 0, sizeof(ndbr_desc));
2727         res.start = spa->address;
2728         res.end = res.start + spa->length - 1;
2729         ndr_desc = &ndbr_desc.ndr_desc;
2730         ndr_desc->res = &res;
2731         ndr_desc->provider_data = nfit_spa;
2732         ndr_desc->attr_groups = acpi_nfit_region_attribute_groups;
2733         if (spa->flags & ACPI_NFIT_PROXIMITY_VALID)
2734                 ndr_desc->numa_node = acpi_map_pxm_to_online_node(
2735                                                 spa->proximity_domain);
2736         else
2737                 ndr_desc->numa_node = NUMA_NO_NODE;
2738
2739         /*
2740          * Persistence domain bits are hierarchical, if
2741          * ACPI_NFIT_CAPABILITY_CACHE_FLUSH is set then
2742          * ACPI_NFIT_CAPABILITY_MEM_FLUSH is implied.
2743          */
2744         if (acpi_desc->platform_cap & ACPI_NFIT_CAPABILITY_CACHE_FLUSH)
2745                 set_bit(ND_REGION_PERSIST_CACHE, &ndr_desc->flags);
2746         else if (acpi_desc->platform_cap & ACPI_NFIT_CAPABILITY_MEM_FLUSH)
2747                 set_bit(ND_REGION_PERSIST_MEMCTRL, &ndr_desc->flags);
2748
2749         list_for_each_entry(nfit_memdev, &acpi_desc->memdevs, list) {
2750                 struct acpi_nfit_memory_map *memdev = nfit_memdev->memdev;
2751                 struct nd_mapping_desc *mapping;
2752
2753                 if (memdev->range_index != spa->range_index)
2754                         continue;
2755                 if (count >= ND_MAX_MAPPINGS) {
2756                         dev_err(acpi_desc->dev, "spa%d exceeds max mappings %d\n",
2757                                         spa->range_index, ND_MAX_MAPPINGS);
2758                         return -ENXIO;
2759                 }
2760                 mapping = &mappings[count++];
2761                 rc = acpi_nfit_init_mapping(acpi_desc, mapping, ndr_desc,
2762                                 memdev, nfit_spa);
2763                 if (rc)
2764                         goto out;
2765         }
2766
2767         ndr_desc->mapping = mappings;
2768         ndr_desc->num_mappings = count;
2769         rc = acpi_nfit_init_interleave_set(acpi_desc, ndr_desc, spa);
2770         if (rc)
2771                 goto out;
2772
2773         nvdimm_bus = acpi_desc->nvdimm_bus;
2774         if (nfit_spa_type(spa) == NFIT_SPA_PM) {
2775                 rc = acpi_nfit_insert_resource(acpi_desc, ndr_desc);
2776                 if (rc) {
2777                         dev_warn(acpi_desc->dev,
2778                                 "failed to insert pmem resource to iomem: %d\n",
2779                                 rc);
2780                         goto out;
2781                 }
2782
2783                 nfit_spa->nd_region = nvdimm_pmem_region_create(nvdimm_bus,
2784                                 ndr_desc);
2785                 if (!nfit_spa->nd_region)
2786                         rc = -ENOMEM;
2787         } else if (nfit_spa_is_volatile(spa)) {
2788                 nfit_spa->nd_region = nvdimm_volatile_region_create(nvdimm_bus,
2789                                 ndr_desc);
2790                 if (!nfit_spa->nd_region)
2791                         rc = -ENOMEM;
2792         } else if (nfit_spa_is_virtual(spa)) {
2793                 nfit_spa->nd_region = nvdimm_pmem_region_create(nvdimm_bus,
2794                                 ndr_desc);
2795                 if (!nfit_spa->nd_region)
2796                         rc = -ENOMEM;
2797         }
2798
2799  out:
2800         if (rc)
2801                 dev_err(acpi_desc->dev, "failed to register spa range %d\n",
2802                                 nfit_spa->spa->range_index);
2803         return rc;
2804 }
2805
2806 static int ars_status_alloc(struct acpi_nfit_desc *acpi_desc)
2807 {
2808         struct device *dev = acpi_desc->dev;
2809         struct nd_cmd_ars_status *ars_status;
2810
2811         if (acpi_desc->ars_status) {
2812                 memset(acpi_desc->ars_status, 0, acpi_desc->max_ars);
2813                 return 0;
2814         }
2815
2816         ars_status = devm_kzalloc(dev, acpi_desc->max_ars, GFP_KERNEL);
2817         if (!ars_status)
2818                 return -ENOMEM;
2819         acpi_desc->ars_status = ars_status;
2820         return 0;
2821 }
2822
2823 static int acpi_nfit_query_poison(struct acpi_nfit_desc *acpi_desc)
2824 {
2825         int rc;
2826
2827         if (ars_status_alloc(acpi_desc))
2828                 return -ENOMEM;
2829
2830         rc = ars_get_status(acpi_desc);
2831
2832         if (rc < 0 && rc != -ENOSPC)
2833                 return rc;
2834
2835         if (ars_status_process_records(acpi_desc))
2836                 return -ENOMEM;
2837
2838         return 0;
2839 }
2840
2841 static int ars_register(struct acpi_nfit_desc *acpi_desc, struct nfit_spa *nfit_spa,
2842                 int *query_rc)
2843 {
2844         int rc = *query_rc;
2845
2846         if (no_init_ars)
2847                 return acpi_nfit_register_region(acpi_desc, nfit_spa);
2848
2849         set_bit(ARS_REQ, &nfit_spa->ars_state);
2850         set_bit(ARS_SHORT, &nfit_spa->ars_state);
2851
2852         switch (rc) {
2853         case 0:
2854         case -EAGAIN:
2855                 rc = ars_start(acpi_desc, nfit_spa);
2856                 if (rc == -EBUSY) {
2857                         *query_rc = rc;
2858                         break;
2859                 } else if (rc == 0) {
2860                         rc = acpi_nfit_query_poison(acpi_desc);
2861                 } else {
2862                         set_bit(ARS_FAILED, &nfit_spa->ars_state);
2863                         break;
2864                 }
2865                 if (rc == -EAGAIN)
2866                         clear_bit(ARS_SHORT, &nfit_spa->ars_state);
2867                 else if (rc == 0)
2868                         ars_complete(acpi_desc, nfit_spa);
2869                 break;
2870         case -EBUSY:
2871         case -ENOSPC:
2872                 break;
2873         default:
2874                 set_bit(ARS_FAILED, &nfit_spa->ars_state);
2875                 break;
2876         }
2877
2878         if (test_and_clear_bit(ARS_DONE, &nfit_spa->ars_state))
2879                 set_bit(ARS_REQ, &nfit_spa->ars_state);
2880
2881         return acpi_nfit_register_region(acpi_desc, nfit_spa);
2882 }
2883
2884 static void ars_complete_all(struct acpi_nfit_desc *acpi_desc)
2885 {
2886         struct nfit_spa *nfit_spa;
2887
2888         list_for_each_entry(nfit_spa, &acpi_desc->spas, list) {
2889                 if (test_bit(ARS_FAILED, &nfit_spa->ars_state))
2890                         continue;
2891                 ars_complete(acpi_desc, nfit_spa);
2892         }
2893 }
2894
2895 static unsigned int __acpi_nfit_scrub(struct acpi_nfit_desc *acpi_desc,
2896                 int query_rc)
2897 {
2898         unsigned int tmo = acpi_desc->scrub_tmo;
2899         struct device *dev = acpi_desc->dev;
2900         struct nfit_spa *nfit_spa;
2901
2902         if (acpi_desc->cancel)
2903                 return 0;
2904
2905         if (query_rc == -EBUSY) {
2906                 dev_dbg(dev, "ARS: ARS busy\n");
2907                 return min(30U * 60U, tmo * 2);
2908         }
2909         if (query_rc == -ENOSPC) {
2910                 dev_dbg(dev, "ARS: ARS continue\n");
2911                 ars_continue(acpi_desc);
2912                 return 1;
2913         }
2914         if (query_rc && query_rc != -EAGAIN) {
2915                 unsigned long long addr, end;
2916
2917                 addr = acpi_desc->ars_status->address;
2918                 end = addr + acpi_desc->ars_status->length;
2919                 dev_dbg(dev, "ARS: %llx-%llx failed (%d)\n", addr, end,
2920                                 query_rc);
2921         }
2922
2923         ars_complete_all(acpi_desc);
2924         list_for_each_entry(nfit_spa, &acpi_desc->spas, list) {
2925                 if (test_bit(ARS_FAILED, &nfit_spa->ars_state))
2926                         continue;
2927                 if (test_bit(ARS_REQ, &nfit_spa->ars_state)) {
2928                         int rc = ars_start(acpi_desc, nfit_spa);
2929
2930                         clear_bit(ARS_DONE, &nfit_spa->ars_state);
2931                         dev = nd_region_dev(nfit_spa->nd_region);
2932                         dev_dbg(dev, "ARS: range %d ARS start (%d)\n",
2933                                         nfit_spa->spa->range_index, rc);
2934                         if (rc == 0 || rc == -EBUSY)
2935                                 return 1;
2936                         dev_err(dev, "ARS: range %d ARS failed (%d)\n",
2937                                         nfit_spa->spa->range_index, rc);
2938                         set_bit(ARS_FAILED, &nfit_spa->ars_state);
2939                 }
2940         }
2941         return 0;
2942 }
2943
2944 static void __sched_ars(struct acpi_nfit_desc *acpi_desc, unsigned int tmo)
2945 {
2946         lockdep_assert_held(&acpi_desc->init_mutex);
2947
2948         acpi_desc->scrub_busy = 1;
2949         /* note this should only be set from within the workqueue */
2950         if (tmo)
2951                 acpi_desc->scrub_tmo = tmo;
2952         queue_delayed_work(nfit_wq, &acpi_desc->dwork, tmo * HZ);
2953 }
2954
2955 static void sched_ars(struct acpi_nfit_desc *acpi_desc)
2956 {
2957         __sched_ars(acpi_desc, 0);
2958 }
2959
2960 static void notify_ars_done(struct acpi_nfit_desc *acpi_desc)
2961 {
2962         lockdep_assert_held(&acpi_desc->init_mutex);
2963
2964         acpi_desc->scrub_busy = 0;
2965         acpi_desc->scrub_count++;
2966         if (acpi_desc->scrub_count_state)
2967                 sysfs_notify_dirent(acpi_desc->scrub_count_state);
2968 }
2969
2970 static void acpi_nfit_scrub(struct work_struct *work)
2971 {
2972         struct acpi_nfit_desc *acpi_desc;
2973         unsigned int tmo;
2974         int query_rc;
2975
2976         acpi_desc = container_of(work, typeof(*acpi_desc), dwork.work);
2977         mutex_lock(&acpi_desc->init_mutex);
2978         query_rc = acpi_nfit_query_poison(acpi_desc);
2979         tmo = __acpi_nfit_scrub(acpi_desc, query_rc);
2980         if (tmo)
2981                 __sched_ars(acpi_desc, tmo);
2982         else
2983                 notify_ars_done(acpi_desc);
2984         memset(acpi_desc->ars_status, 0, acpi_desc->max_ars);
2985         mutex_unlock(&acpi_desc->init_mutex);
2986 }
2987
2988 static void acpi_nfit_init_ars(struct acpi_nfit_desc *acpi_desc,
2989                 struct nfit_spa *nfit_spa)
2990 {
2991         int type = nfit_spa_type(nfit_spa->spa);
2992         struct nd_cmd_ars_cap ars_cap;
2993         int rc;
2994
2995         memset(&ars_cap, 0, sizeof(ars_cap));
2996         rc = ars_get_cap(acpi_desc, &ars_cap, nfit_spa);
2997         if (rc < 0)
2998                 return;
2999         /* check that the supported scrub types match the spa type */
3000         if (type == NFIT_SPA_VOLATILE && ((ars_cap.status >> 16)
3001                                 & ND_ARS_VOLATILE) == 0)
3002                 return;
3003         if (type == NFIT_SPA_PM && ((ars_cap.status >> 16)
3004                                 & ND_ARS_PERSISTENT) == 0)
3005                 return;
3006
3007         nfit_spa->max_ars = ars_cap.max_ars_out;
3008         nfit_spa->clear_err_unit = ars_cap.clear_err_unit;
3009         acpi_desc->max_ars = max(nfit_spa->max_ars, acpi_desc->max_ars);
3010         clear_bit(ARS_FAILED, &nfit_spa->ars_state);
3011         set_bit(ARS_REQ, &nfit_spa->ars_state);
3012 }
3013
3014 static int acpi_nfit_register_regions(struct acpi_nfit_desc *acpi_desc)
3015 {
3016         struct nfit_spa *nfit_spa;
3017         int rc, query_rc;
3018
3019         list_for_each_entry(nfit_spa, &acpi_desc->spas, list) {
3020                 set_bit(ARS_FAILED, &nfit_spa->ars_state);
3021                 switch (nfit_spa_type(nfit_spa->spa)) {
3022                 case NFIT_SPA_VOLATILE:
3023                 case NFIT_SPA_PM:
3024                         acpi_nfit_init_ars(acpi_desc, nfit_spa);
3025                         break;
3026                 }
3027         }
3028
3029         /*
3030          * Reap any results that might be pending before starting new
3031          * short requests.
3032          */
3033         query_rc = acpi_nfit_query_poison(acpi_desc);
3034         if (query_rc == 0)
3035                 ars_complete_all(acpi_desc);
3036
3037         list_for_each_entry(nfit_spa, &acpi_desc->spas, list)
3038                 switch (nfit_spa_type(nfit_spa->spa)) {
3039                 case NFIT_SPA_VOLATILE:
3040                 case NFIT_SPA_PM:
3041                         /* register regions and kick off initial ARS run */
3042                         rc = ars_register(acpi_desc, nfit_spa, &query_rc);
3043                         if (rc)
3044                                 return rc;
3045                         break;
3046                 case NFIT_SPA_BDW:
3047                         /* nothing to register */
3048                         break;
3049                 case NFIT_SPA_DCR:
3050                 case NFIT_SPA_VDISK:
3051                 case NFIT_SPA_VCD:
3052                 case NFIT_SPA_PDISK:
3053                 case NFIT_SPA_PCD:
3054                         /* register known regions that don't support ARS */
3055                         rc = acpi_nfit_register_region(acpi_desc, nfit_spa);
3056                         if (rc)
3057                                 return rc;
3058                         break;
3059                 default:
3060                         /* don't register unknown regions */
3061                         break;
3062                 }
3063
3064         sched_ars(acpi_desc);
3065         return 0;
3066 }
3067
3068 static int acpi_nfit_check_deletions(struct acpi_nfit_desc *acpi_desc,
3069                 struct nfit_table_prev *prev)
3070 {
3071         struct device *dev = acpi_desc->dev;
3072
3073         if (!list_empty(&prev->spas) ||
3074                         !list_empty(&prev->memdevs) ||
3075                         !list_empty(&prev->dcrs) ||
3076                         !list_empty(&prev->bdws) ||
3077                         !list_empty(&prev->idts) ||
3078                         !list_empty(&prev->flushes)) {
3079                 dev_err(dev, "new nfit deletes entries (unsupported)\n");
3080                 return -ENXIO;
3081         }
3082         return 0;
3083 }
3084
3085 static int acpi_nfit_desc_init_scrub_attr(struct acpi_nfit_desc *acpi_desc)
3086 {
3087         struct device *dev = acpi_desc->dev;
3088         struct kernfs_node *nfit;
3089         struct device *bus_dev;
3090
3091         if (!ars_supported(acpi_desc->nvdimm_bus))
3092                 return 0;
3093
3094         bus_dev = to_nvdimm_bus_dev(acpi_desc->nvdimm_bus);
3095         nfit = sysfs_get_dirent(bus_dev->kobj.sd, "nfit");
3096         if (!nfit) {
3097                 dev_err(dev, "sysfs_get_dirent 'nfit' failed\n");
3098                 return -ENODEV;
3099         }
3100         acpi_desc->scrub_count_state = sysfs_get_dirent(nfit, "scrub");
3101         sysfs_put(nfit);
3102         if (!acpi_desc->scrub_count_state) {
3103                 dev_err(dev, "sysfs_get_dirent 'scrub' failed\n");
3104                 return -ENODEV;
3105         }
3106
3107         return 0;
3108 }
3109
3110 static void acpi_nfit_unregister(void *data)
3111 {
3112         struct acpi_nfit_desc *acpi_desc = data;
3113
3114         nvdimm_bus_unregister(acpi_desc->nvdimm_bus);
3115 }
3116
3117 int acpi_nfit_init(struct acpi_nfit_desc *acpi_desc, void *data, acpi_size sz)
3118 {
3119         struct device *dev = acpi_desc->dev;
3120         struct nfit_table_prev prev;
3121         const void *end;
3122         int rc;
3123
3124         if (!acpi_desc->nvdimm_bus) {
3125                 acpi_nfit_init_dsms(acpi_desc);
3126
3127                 acpi_desc->nvdimm_bus = nvdimm_bus_register(dev,
3128                                 &acpi_desc->nd_desc);
3129                 if (!acpi_desc->nvdimm_bus)
3130                         return -ENOMEM;
3131
3132                 rc = devm_add_action_or_reset(dev, acpi_nfit_unregister,
3133                                 acpi_desc);
3134                 if (rc)
3135                         return rc;
3136
3137                 rc = acpi_nfit_desc_init_scrub_attr(acpi_desc);
3138                 if (rc)
3139                         return rc;
3140
3141                 /* register this acpi_desc for mce notifications */
3142                 mutex_lock(&acpi_desc_lock);
3143                 list_add_tail(&acpi_desc->list, &acpi_descs);
3144                 mutex_unlock(&acpi_desc_lock);
3145         }
3146
3147         mutex_lock(&acpi_desc->init_mutex);
3148
3149         INIT_LIST_HEAD(&prev.spas);
3150         INIT_LIST_HEAD(&prev.memdevs);
3151         INIT_LIST_HEAD(&prev.dcrs);
3152         INIT_LIST_HEAD(&prev.bdws);
3153         INIT_LIST_HEAD(&prev.idts);
3154         INIT_LIST_HEAD(&prev.flushes);
3155
3156         list_cut_position(&prev.spas, &acpi_desc->spas,
3157                                 acpi_desc->spas.prev);
3158         list_cut_position(&prev.memdevs, &acpi_desc->memdevs,
3159                                 acpi_desc->memdevs.prev);
3160         list_cut_position(&prev.dcrs, &acpi_desc->dcrs,
3161                                 acpi_desc->dcrs.prev);
3162         list_cut_position(&prev.bdws, &acpi_desc->bdws,
3163                                 acpi_desc->bdws.prev);
3164         list_cut_position(&prev.idts, &acpi_desc->idts,
3165                                 acpi_desc->idts.prev);
3166         list_cut_position(&prev.flushes, &acpi_desc->flushes,
3167                                 acpi_desc->flushes.prev);
3168
3169         end = data + sz;
3170         while (!IS_ERR_OR_NULL(data))
3171                 data = add_table(acpi_desc, &prev, data, end);
3172
3173         if (IS_ERR(data)) {
3174                 dev_dbg(dev, "nfit table parsing error: %ld\n", PTR_ERR(data));
3175                 rc = PTR_ERR(data);
3176                 goto out_unlock;
3177         }
3178
3179         rc = acpi_nfit_check_deletions(acpi_desc, &prev);
3180         if (rc)
3181                 goto out_unlock;
3182
3183         rc = nfit_mem_init(acpi_desc);
3184         if (rc)
3185                 goto out_unlock;
3186
3187         rc = acpi_nfit_register_dimms(acpi_desc);
3188         if (rc)
3189                 goto out_unlock;
3190
3191         rc = acpi_nfit_register_regions(acpi_desc);
3192
3193  out_unlock:
3194         mutex_unlock(&acpi_desc->init_mutex);
3195         return rc;
3196 }
3197 EXPORT_SYMBOL_GPL(acpi_nfit_init);
3198
3199 static int acpi_nfit_flush_probe(struct nvdimm_bus_descriptor *nd_desc)
3200 {
3201         struct acpi_nfit_desc *acpi_desc = to_acpi_nfit_desc(nd_desc);
3202         struct device *dev = acpi_desc->dev;
3203
3204         /* Bounce the device lock to flush acpi_nfit_add / acpi_nfit_notify */
3205         device_lock(dev);
3206         device_unlock(dev);
3207
3208         /* Bounce the init_mutex to complete initial registration */
3209         mutex_lock(&acpi_desc->init_mutex);
3210         mutex_unlock(&acpi_desc->init_mutex);
3211
3212         return 0;
3213 }
3214
3215 static int acpi_nfit_clear_to_send(struct nvdimm_bus_descriptor *nd_desc,
3216                 struct nvdimm *nvdimm, unsigned int cmd)
3217 {
3218         struct acpi_nfit_desc *acpi_desc = to_acpi_nfit_desc(nd_desc);
3219
3220         if (nvdimm)
3221                 return 0;
3222         if (cmd != ND_CMD_ARS_START)
3223                 return 0;
3224
3225         /*
3226          * The kernel and userspace may race to initiate a scrub, but
3227          * the scrub thread is prepared to lose that initial race.  It
3228          * just needs guarantees that any ars it initiates are not
3229          * interrupted by any intervening start reqeusts from userspace.
3230          */
3231         if (work_busy(&acpi_desc->dwork.work))
3232                 return -EBUSY;
3233
3234         return 0;
3235 }
3236
3237 int acpi_nfit_ars_rescan(struct acpi_nfit_desc *acpi_desc, unsigned long flags)
3238 {
3239         struct device *dev = acpi_desc->dev;
3240         int scheduled = 0, busy = 0;
3241         struct nfit_spa *nfit_spa;
3242
3243         mutex_lock(&acpi_desc->init_mutex);
3244         if (acpi_desc->cancel) {
3245                 mutex_unlock(&acpi_desc->init_mutex);
3246                 return 0;
3247         }
3248
3249         list_for_each_entry(nfit_spa, &acpi_desc->spas, list) {
3250                 int type = nfit_spa_type(nfit_spa->spa);
3251
3252                 if (type != NFIT_SPA_PM && type != NFIT_SPA_VOLATILE)
3253                         continue;
3254                 if (test_bit(ARS_FAILED, &nfit_spa->ars_state))
3255                         continue;
3256
3257                 if (test_and_set_bit(ARS_REQ, &nfit_spa->ars_state))
3258                         busy++;
3259                 else {
3260                         if (test_bit(ARS_SHORT, &flags))
3261                                 set_bit(ARS_SHORT, &nfit_spa->ars_state);
3262                         scheduled++;
3263                 }
3264         }
3265         if (scheduled) {
3266                 sched_ars(acpi_desc);
3267                 dev_dbg(dev, "ars_scan triggered\n");
3268         }
3269         mutex_unlock(&acpi_desc->init_mutex);
3270
3271         if (scheduled)
3272                 return 0;
3273         if (busy)
3274                 return -EBUSY;
3275         return -ENOTTY;
3276 }
3277
3278 void acpi_nfit_desc_init(struct acpi_nfit_desc *acpi_desc, struct device *dev)
3279 {
3280         struct nvdimm_bus_descriptor *nd_desc;
3281
3282         dev_set_drvdata(dev, acpi_desc);
3283         acpi_desc->dev = dev;
3284         acpi_desc->blk_do_io = acpi_nfit_blk_region_do_io;
3285         nd_desc = &acpi_desc->nd_desc;
3286         nd_desc->provider_name = "ACPI.NFIT";
3287         nd_desc->module = THIS_MODULE;
3288         nd_desc->ndctl = acpi_nfit_ctl;
3289         nd_desc->flush_probe = acpi_nfit_flush_probe;
3290         nd_desc->clear_to_send = acpi_nfit_clear_to_send;
3291         nd_desc->attr_groups = acpi_nfit_attribute_groups;
3292
3293         INIT_LIST_HEAD(&acpi_desc->spas);
3294         INIT_LIST_HEAD(&acpi_desc->dcrs);
3295         INIT_LIST_HEAD(&acpi_desc->bdws);
3296         INIT_LIST_HEAD(&acpi_desc->idts);
3297         INIT_LIST_HEAD(&acpi_desc->flushes);
3298         INIT_LIST_HEAD(&acpi_desc->memdevs);
3299         INIT_LIST_HEAD(&acpi_desc->dimms);
3300         INIT_LIST_HEAD(&acpi_desc->list);
3301         mutex_init(&acpi_desc->init_mutex);
3302         acpi_desc->scrub_tmo = 1;
3303         INIT_DELAYED_WORK(&acpi_desc->dwork, acpi_nfit_scrub);
3304 }
3305 EXPORT_SYMBOL_GPL(acpi_nfit_desc_init);
3306
3307 static void acpi_nfit_put_table(void *table)
3308 {
3309         acpi_put_table(table);
3310 }
3311
3312 void acpi_nfit_shutdown(void *data)
3313 {
3314         struct acpi_nfit_desc *acpi_desc = data;
3315         struct device *bus_dev = to_nvdimm_bus_dev(acpi_desc->nvdimm_bus);
3316
3317         /*
3318          * Destruct under acpi_desc_lock so that nfit_handle_mce does not
3319          * race teardown
3320          */
3321         mutex_lock(&acpi_desc_lock);
3322         list_del(&acpi_desc->list);
3323         mutex_unlock(&acpi_desc_lock);
3324
3325         mutex_lock(&acpi_desc->init_mutex);
3326         acpi_desc->cancel = 1;
3327         cancel_delayed_work_sync(&acpi_desc->dwork);
3328         mutex_unlock(&acpi_desc->init_mutex);
3329
3330         /*
3331          * Bounce the nvdimm bus lock to make sure any in-flight
3332          * acpi_nfit_ars_rescan() submissions have had a chance to
3333          * either submit or see ->cancel set.
3334          */
3335         device_lock(bus_dev);
3336         device_unlock(bus_dev);
3337
3338         flush_workqueue(nfit_wq);
3339 }
3340 EXPORT_SYMBOL_GPL(acpi_nfit_shutdown);
3341
3342 static int acpi_nfit_add(struct acpi_device *adev)
3343 {
3344         struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL };
3345         struct acpi_nfit_desc *acpi_desc;
3346         struct device *dev = &adev->dev;
3347         struct acpi_table_header *tbl;
3348         acpi_status status = AE_OK;
3349         acpi_size sz;
3350         int rc = 0;
3351
3352         status = acpi_get_table(ACPI_SIG_NFIT, 0, &tbl);
3353         if (ACPI_FAILURE(status)) {
3354                 /* This is ok, we could have an nvdimm hotplugged later */
3355                 dev_dbg(dev, "failed to find NFIT at startup\n");
3356                 return 0;
3357         }
3358
3359         rc = devm_add_action_or_reset(dev, acpi_nfit_put_table, tbl);
3360         if (rc)
3361                 return rc;
3362         sz = tbl->length;
3363
3364         acpi_desc = devm_kzalloc(dev, sizeof(*acpi_desc), GFP_KERNEL);
3365         if (!acpi_desc)
3366                 return -ENOMEM;
3367         acpi_nfit_desc_init(acpi_desc, &adev->dev);
3368
3369         /* Save the acpi header for exporting the revision via sysfs */
3370         acpi_desc->acpi_header = *tbl;
3371
3372         /* Evaluate _FIT and override with that if present */
3373         status = acpi_evaluate_object(adev->handle, "_FIT", NULL, &buf);
3374         if (ACPI_SUCCESS(status) && buf.length > 0) {
3375                 union acpi_object *obj = buf.pointer;
3376
3377                 if (obj->type == ACPI_TYPE_BUFFER)
3378                         rc = acpi_nfit_init(acpi_desc, obj->buffer.pointer,
3379                                         obj->buffer.length);
3380                 else
3381                         dev_dbg(dev, "invalid type %d, ignoring _FIT\n",
3382                                 (int) obj->type);
3383                 kfree(buf.pointer);
3384         } else
3385                 /* skip over the lead-in header table */
3386                 rc = acpi_nfit_init(acpi_desc, (void *) tbl
3387                                 + sizeof(struct acpi_table_nfit),
3388                                 sz - sizeof(struct acpi_table_nfit));
3389
3390         if (rc)
3391                 return rc;
3392         return devm_add_action_or_reset(dev, acpi_nfit_shutdown, acpi_desc);
3393 }
3394
3395 static int acpi_nfit_remove(struct acpi_device *adev)
3396 {
3397         /* see acpi_nfit_unregister */
3398         return 0;
3399 }
3400
3401 static void acpi_nfit_update_notify(struct device *dev, acpi_handle handle)
3402 {
3403         struct acpi_nfit_desc *acpi_desc = dev_get_drvdata(dev);
3404         struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL };
3405         union acpi_object *obj;
3406         acpi_status status;
3407         int ret;
3408
3409         if (!dev->driver) {
3410                 /* dev->driver may be null if we're being removed */
3411                 dev_dbg(dev, "no driver found for dev\n");
3412                 return;
3413         }
3414
3415         if (!acpi_desc) {
3416                 acpi_desc = devm_kzalloc(dev, sizeof(*acpi_desc), GFP_KERNEL);
3417                 if (!acpi_desc)
3418                         return;
3419                 acpi_nfit_desc_init(acpi_desc, dev);
3420         } else {
3421                 /*
3422                  * Finish previous registration before considering new
3423                  * regions.
3424                  */
3425                 flush_workqueue(nfit_wq);
3426         }
3427
3428         /* Evaluate _FIT */
3429         status = acpi_evaluate_object(handle, "_FIT", NULL, &buf);
3430         if (ACPI_FAILURE(status)) {
3431                 dev_err(dev, "failed to evaluate _FIT\n");
3432                 return;
3433         }
3434
3435         obj = buf.pointer;
3436         if (obj->type == ACPI_TYPE_BUFFER) {
3437                 ret = acpi_nfit_init(acpi_desc, obj->buffer.pointer,
3438                                 obj->buffer.length);
3439                 if (ret)
3440                         dev_err(dev, "failed to merge updated NFIT\n");
3441         } else
3442                 dev_err(dev, "Invalid _FIT\n");
3443         kfree(buf.pointer);
3444 }
3445
3446 static void acpi_nfit_uc_error_notify(struct device *dev, acpi_handle handle)
3447 {
3448         struct acpi_nfit_desc *acpi_desc = dev_get_drvdata(dev);
3449         unsigned long flags = (acpi_desc->scrub_mode == HW_ERROR_SCRUB_ON) ?
3450                         0 : 1 << ARS_SHORT;
3451
3452         acpi_nfit_ars_rescan(acpi_desc, flags);
3453 }
3454
3455 void __acpi_nfit_notify(struct device *dev, acpi_handle handle, u32 event)
3456 {
3457         dev_dbg(dev, "event: 0x%x\n", event);
3458
3459         switch (event) {
3460         case NFIT_NOTIFY_UPDATE:
3461                 return acpi_nfit_update_notify(dev, handle);
3462         case NFIT_NOTIFY_UC_MEMORY_ERROR:
3463                 return acpi_nfit_uc_error_notify(dev, handle);
3464         default:
3465                 return;
3466         }
3467 }
3468 EXPORT_SYMBOL_GPL(__acpi_nfit_notify);
3469
3470 static void acpi_nfit_notify(struct acpi_device *adev, u32 event)
3471 {
3472         device_lock(&adev->dev);
3473         __acpi_nfit_notify(&adev->dev, adev->handle, event);
3474         device_unlock(&adev->dev);
3475 }
3476
3477 static const struct acpi_device_id acpi_nfit_ids[] = {
3478         { "ACPI0012", 0 },
3479         { "", 0 },
3480 };
3481 MODULE_DEVICE_TABLE(acpi, acpi_nfit_ids);
3482
3483 static struct acpi_driver acpi_nfit_driver = {
3484         .name = KBUILD_MODNAME,
3485         .ids = acpi_nfit_ids,
3486         .ops = {
3487                 .add = acpi_nfit_add,
3488                 .remove = acpi_nfit_remove,
3489                 .notify = acpi_nfit_notify,
3490         },
3491 };
3492
3493 static __init int nfit_init(void)
3494 {
3495         int ret;
3496
3497         BUILD_BUG_ON(sizeof(struct acpi_table_nfit) != 40);
3498         BUILD_BUG_ON(sizeof(struct acpi_nfit_system_address) != 56);
3499         BUILD_BUG_ON(sizeof(struct acpi_nfit_memory_map) != 48);
3500         BUILD_BUG_ON(sizeof(struct acpi_nfit_interleave) != 20);
3501         BUILD_BUG_ON(sizeof(struct acpi_nfit_smbios) != 9);
3502         BUILD_BUG_ON(sizeof(struct acpi_nfit_control_region) != 80);
3503         BUILD_BUG_ON(sizeof(struct acpi_nfit_data_region) != 40);
3504         BUILD_BUG_ON(sizeof(struct acpi_nfit_capabilities) != 16);
3505
3506         guid_parse(UUID_VOLATILE_MEMORY, &nfit_uuid[NFIT_SPA_VOLATILE]);
3507         guid_parse(UUID_PERSISTENT_MEMORY, &nfit_uuid[NFIT_SPA_PM]);
3508         guid_parse(UUID_CONTROL_REGION, &nfit_uuid[NFIT_SPA_DCR]);
3509         guid_parse(UUID_DATA_REGION, &nfit_uuid[NFIT_SPA_BDW]);
3510         guid_parse(UUID_VOLATILE_VIRTUAL_DISK, &nfit_uuid[NFIT_SPA_VDISK]);
3511         guid_parse(UUID_VOLATILE_VIRTUAL_CD, &nfit_uuid[NFIT_SPA_VCD]);
3512         guid_parse(UUID_PERSISTENT_VIRTUAL_DISK, &nfit_uuid[NFIT_SPA_PDISK]);
3513         guid_parse(UUID_PERSISTENT_VIRTUAL_CD, &nfit_uuid[NFIT_SPA_PCD]);
3514         guid_parse(UUID_NFIT_BUS, &nfit_uuid[NFIT_DEV_BUS]);
3515         guid_parse(UUID_NFIT_DIMM, &nfit_uuid[NFIT_DEV_DIMM]);
3516         guid_parse(UUID_NFIT_DIMM_N_HPE1, &nfit_uuid[NFIT_DEV_DIMM_N_HPE1]);
3517         guid_parse(UUID_NFIT_DIMM_N_HPE2, &nfit_uuid[NFIT_DEV_DIMM_N_HPE2]);
3518         guid_parse(UUID_NFIT_DIMM_N_MSFT, &nfit_uuid[NFIT_DEV_DIMM_N_MSFT]);
3519
3520         nfit_wq = create_singlethread_workqueue("nfit");
3521         if (!nfit_wq)
3522                 return -ENOMEM;
3523
3524         nfit_mce_register();
3525         ret = acpi_bus_register_driver(&acpi_nfit_driver);
3526         if (ret) {
3527                 nfit_mce_unregister();
3528                 destroy_workqueue(nfit_wq);
3529         }
3530
3531         return ret;
3532
3533 }
3534
3535 static __exit void nfit_exit(void)
3536 {
3537         nfit_mce_unregister();
3538         acpi_bus_unregister_driver(&acpi_nfit_driver);
3539         destroy_workqueue(nfit_wq);
3540         WARN_ON(!list_empty(&acpi_descs));
3541 }
3542
3543 module_init(nfit_init);
3544 module_exit(nfit_exit);
3545 MODULE_LICENSE("GPL v2");
3546 MODULE_AUTHOR("Intel Corporation");