drivers/edac/edac_mc_sysfs.c

   1 /*
   2  * edac_mc kernel module
   3  * (C) 2005-2007 Linux Networx (http://lnxi.com)
   4  *
   5  * This file may be distributed under the terms of the
   6  * GNU General Public License.
   7  *
   8  * Written Doug Thompson <norsk5@xmission.com> www.softwarebitmaker.com
   9  *
  10  * (c) 2012-2013 - Mauro Carvalho Chehab
  11  *      The entire API were re-written, and ported to use struct device
  12  *
  13  */
  14
  15 #include <linux/ctype.h>
  16 #include <linux/slab.h>
  17 #include <linux/edac.h>
  18 #include <linux/bug.h>
  19 #include <linux/pm_runtime.h>
  20 #include <linux/uaccess.h>
  21
  22 #include "edac_mc.h"
  23 #include "edac_module.h"
  24
  25 /* MC EDAC Controls, setable by module parameter, and sysfs */
  26 static int edac_mc_log_ue = 1;
  27 static int edac_mc_log_ce = 1;
  28 static int edac_mc_panic_on_ue;
  29 static unsigned int edac_mc_poll_msec = 1000;
  30
  31 /* Getter functions for above */
  32 int edac_mc_get_log_ue(void)
  33 {
  34         return edac_mc_log_ue;
  35 }
  36
  37 int edac_mc_get_log_ce(void)
  38 {
  39         return edac_mc_log_ce;
  40 }
  41
  42 int edac_mc_get_panic_on_ue(void)
  43 {
  44         return edac_mc_panic_on_ue;
  45 }
  46
  47 /* this is temporary */
  48 unsigned int edac_mc_get_poll_msec(void)
  49 {
  50         return edac_mc_poll_msec;
  51 }
  52
  53 static int edac_set_poll_msec(const char *val, const struct kernel_param *kp)
  54 {
  55         unsigned int i;
  56         int ret;
  57
  58         if (!val)
  59                 return -EINVAL;
  60
  61         ret = kstrtouint(val, 0, &i);
  62         if (ret)
  63                 return ret;
  64
  65         if (i < 1000)
  66                 return -EINVAL;
  67
  68         *((unsigned int *)kp->arg) = i;
  69
  70         /* notify edac_mc engine to reset the poll period */
  71         edac_mc_reset_delay_period(i);
  72
  73         return 0;
  74 }
  75
  76 /* Parameter declarations for above */
  77 module_param(edac_mc_panic_on_ue, int, 0644);
  78 MODULE_PARM_DESC(edac_mc_panic_on_ue, "Panic on uncorrected error: 0=off 1=on");
  79 module_param(edac_mc_log_ue, int, 0644);
  80 MODULE_PARM_DESC(edac_mc_log_ue,
  81                  "Log uncorrectable error to console: 0=off 1=on");
  82 module_param(edac_mc_log_ce, int, 0644);
  83 MODULE_PARM_DESC(edac_mc_log_ce,
  84                  "Log correctable error to console: 0=off 1=on");
  85 module_param_call(edac_mc_poll_msec, edac_set_poll_msec, param_get_uint,
  86                   &edac_mc_poll_msec, 0644);
  87 MODULE_PARM_DESC(edac_mc_poll_msec, "Polling period in milliseconds");
  88
  89 static struct device *mci_pdev;
  90
  91 /*
  92  * various constants for Memory Controllers
  93  */
  94 static const char * const dev_types[] = {
  95         [DEV_UNKNOWN] = "Unknown",
  96         [DEV_X1] = "x1",
  97         [DEV_X2] = "x2",
  98         [DEV_X4] = "x4",
  99         [DEV_X8] = "x8",
 100         [DEV_X16] = "x16",
 101         [DEV_X32] = "x32",
 102         [DEV_X64] = "x64"
 103 };
 104
 105 static const char * const edac_caps[] = {
 106         [EDAC_UNKNOWN] = "Unknown",
 107         [EDAC_NONE] = "None",
 108         [EDAC_RESERVED] = "Reserved",
 109         [EDAC_PARITY] = "PARITY",
 110         [EDAC_EC] = "EC",
 111         [EDAC_SECDED] = "SECDED",
 112         [EDAC_S2ECD2ED] = "S2ECD2ED",
 113         [EDAC_S4ECD4ED] = "S4ECD4ED",
 114         [EDAC_S8ECD8ED] = "S8ECD8ED",
 115         [EDAC_S16ECD16ED] = "S16ECD16ED"
 116 };
 117
 118 #ifdef CONFIG_EDAC_LEGACY_SYSFS
 119 /*
 120  * EDAC sysfs CSROW data structures and methods
 121  */
 122
 123 #define to_csrow(k) container_of(k, struct csrow_info, dev)
 124
 125 /*
 126  * We need it to avoid namespace conflicts between the legacy API
 127  * and the per-dimm/per-rank one
 128  */
 129 #define DEVICE_ATTR_LEGACY(_name, _mode, _show, _store) \
 130         static struct device_attribute dev_attr_legacy_##_name = __ATTR(_name, _mode, _show, _store)
 131
 132 struct dev_ch_attribute {
 133         struct device_attribute attr;
 134         unsigned int channel;
 135 };
 136
 137 #define DEVICE_CHANNEL(_name, _mode, _show, _store, _var) \
 138         static struct dev_ch_attribute dev_attr_legacy_##_name = \
 139                 { __ATTR(_name, _mode, _show, _store), (_var) }
 140
 141 #define to_channel(k) (container_of(k, struct dev_ch_attribute, attr)->channel)
 142
 143 /* Set of more default csrow<id> attribute show/store functions */
 144 static ssize_t csrow_ue_count_show(struct device *dev,
 145                                    struct device_attribute *mattr, char *data)
 146 {
 147         struct csrow_info *csrow = to_csrow(dev);
 148
 149         return sprintf(data, "%u\n", csrow->ue_count);
 150 }
 151
 152 static ssize_t csrow_ce_count_show(struct device *dev,
 153                                    struct device_attribute *mattr, char *data)
 154 {
 155         struct csrow_info *csrow = to_csrow(dev);
 156
 157         return sprintf(data, "%u\n", csrow->ce_count);
 158 }
 159
 160 static ssize_t csrow_size_show(struct device *dev,
 161                                struct device_attribute *mattr, char *data)
 162 {
 163         struct csrow_info *csrow = to_csrow(dev);
 164         int i;
 165         u32 nr_pages = 0;
 166
 167         for (i = 0; i < csrow->nr_channels; i++)
 168                 nr_pages += csrow->channels[i]->dimm->nr_pages;
 169         return sprintf(data, "%u\n", PAGES_TO_MiB(nr_pages));
 170 }
 171
 172 static ssize_t csrow_mem_type_show(struct device *dev,
 173                                    struct device_attribute *mattr, char *data)
 174 {
 175         struct csrow_info *csrow = to_csrow(dev);
 176
 177         return sprintf(data, "%s\n", edac_mem_types[csrow->channels[0]->dimm->mtype]);
 178 }
 179
 180 static ssize_t csrow_dev_type_show(struct device *dev,
 181                                    struct device_attribute *mattr, char *data)
 182 {
 183         struct csrow_info *csrow = to_csrow(dev);
 184
 185         return sprintf(data, "%s\n", dev_types[csrow->channels[0]->dimm->dtype]);
 186 }
 187
 188 static ssize_t csrow_edac_mode_show(struct device *dev,
 189                                     struct device_attribute *mattr,
 190                                     char *data)
 191 {
 192         struct csrow_info *csrow = to_csrow(dev);
 193
 194         return sprintf(data, "%s\n", edac_caps[csrow->channels[0]->dimm->edac_mode]);
 195 }
 196
 197 /* show/store functions for DIMM Label attributes */
 198 static ssize_t channel_dimm_label_show(struct device *dev,
 199                                        struct device_attribute *mattr,
 200                                        char *data)
 201 {
 202         struct csrow_info *csrow = to_csrow(dev);
 203         unsigned int chan = to_channel(mattr);
 204         struct rank_info *rank = csrow->channels[chan];
 205
 206         /* if field has not been initialized, there is nothing to send */
 207         if (!rank->dimm->label[0])
 208                 return 0;
 209
 210         return snprintf(data, sizeof(rank->dimm->label) + 1, "%s\n",
 211                         rank->dimm->label);
 212 }
 213
 214 static ssize_t channel_dimm_label_store(struct device *dev,
 215                                         struct device_attribute *mattr,
 216                                         const char *data, size_t count)
 217 {
 218         struct csrow_info *csrow = to_csrow(dev);
 219         unsigned int chan = to_channel(mattr);
 220         struct rank_info *rank = csrow->channels[chan];
 221         size_t copy_count = count;
 222
 223         if (count == 0)
 224                 return -EINVAL;
 225
 226         if (data[count - 1] == '\0' || data[count - 1] == '\n')
 227                 copy_count -= 1;
 228
 229         if (copy_count == 0 || copy_count >= sizeof(rank->dimm->label))
 230                 return -EINVAL;
 231
 232         strncpy(rank->dimm->label, data, copy_count);
 233         rank->dimm->label[copy_count] = '\0';
 234
 235         return count;
 236 }
 237
 238 /* show function for dynamic chX_ce_count attribute */
 239 static ssize_t channel_ce_count_show(struct device *dev,
 240                                      struct device_attribute *mattr, char *data)
 241 {
 242         struct csrow_info *csrow = to_csrow(dev);
 243         unsigned int chan = to_channel(mattr);
 244         struct rank_info *rank = csrow->channels[chan];
 245
 246         return sprintf(data, "%u\n", rank->ce_count);
 247 }
 248
 249 /* cwrow<id>/attribute files */
 250 DEVICE_ATTR_LEGACY(size_mb, S_IRUGO, csrow_size_show, NULL);
 251 DEVICE_ATTR_LEGACY(dev_type, S_IRUGO, csrow_dev_type_show, NULL);
 252 DEVICE_ATTR_LEGACY(mem_type, S_IRUGO, csrow_mem_type_show, NULL);
 253 DEVICE_ATTR_LEGACY(edac_mode, S_IRUGO, csrow_edac_mode_show, NULL);
 254 DEVICE_ATTR_LEGACY(ue_count, S_IRUGO, csrow_ue_count_show, NULL);
 255 DEVICE_ATTR_LEGACY(ce_count, S_IRUGO, csrow_ce_count_show, NULL);
 256
 257 /* default attributes of the CSROW<id> object */
 258 static struct attribute *csrow_attrs[] = {
 259         &dev_attr_legacy_dev_type.attr,
 260         &dev_attr_legacy_mem_type.attr,
 261         &dev_attr_legacy_edac_mode.attr,
 262         &dev_attr_legacy_size_mb.attr,
 263         &dev_attr_legacy_ue_count.attr,
 264         &dev_attr_legacy_ce_count.attr,
 265         NULL,
 266 };
 267
 268 static const struct attribute_group csrow_attr_grp = {
 269         .attrs  = csrow_attrs,
 270 };
 271
 272 static const struct attribute_group *csrow_attr_groups[] = {
 273         &csrow_attr_grp,
 274         NULL
 275 };
 276
 277 static const struct device_type csrow_attr_type = {
 278         .groups         = csrow_attr_groups,
 279 };
 280
 281 /*
 282  * possible dynamic channel DIMM Label attribute files
 283  *
 284  */
 285 DEVICE_CHANNEL(ch0_dimm_label, S_IRUGO | S_IWUSR,
 286         channel_dimm_label_show, channel_dimm_label_store, 0);
 287 DEVICE_CHANNEL(ch1_dimm_label, S_IRUGO | S_IWUSR,
 288         channel_dimm_label_show, channel_dimm_label_store, 1);
 289 DEVICE_CHANNEL(ch2_dimm_label, S_IRUGO | S_IWUSR,
 290         channel_dimm_label_show, channel_dimm_label_store, 2);
 291 DEVICE_CHANNEL(ch3_dimm_label, S_IRUGO | S_IWUSR,
 292         channel_dimm_label_show, channel_dimm_label_store, 3);
 293 DEVICE_CHANNEL(ch4_dimm_label, S_IRUGO | S_IWUSR,
 294         channel_dimm_label_show, channel_dimm_label_store, 4);
 295 DEVICE_CHANNEL(ch5_dimm_label, S_IRUGO | S_IWUSR,
 296         channel_dimm_label_show, channel_dimm_label_store, 5);
 297 DEVICE_CHANNEL(ch6_dimm_label, S_IRUGO | S_IWUSR,
 298         channel_dimm_label_show, channel_dimm_label_store, 6);
 299 DEVICE_CHANNEL(ch7_dimm_label, S_IRUGO | S_IWUSR,
 300         channel_dimm_label_show, channel_dimm_label_store, 7);
 301
 302 /* Total possible dynamic DIMM Label attribute file table */
 303 static struct attribute *dynamic_csrow_dimm_attr[] = {
 304         &dev_attr_legacy_ch0_dimm_label.attr.attr,
 305         &dev_attr_legacy_ch1_dimm_label.attr.attr,
 306         &dev_attr_legacy_ch2_dimm_label.attr.attr,
 307         &dev_attr_legacy_ch3_dimm_label.attr.attr,
 308         &dev_attr_legacy_ch4_dimm_label.attr.attr,
 309         &dev_attr_legacy_ch5_dimm_label.attr.attr,
 310         &dev_attr_legacy_ch6_dimm_label.attr.attr,
 311         &dev_attr_legacy_ch7_dimm_label.attr.attr,
 312         NULL
 313 };
 314
 315 /* possible dynamic channel ce_count attribute files */
 316 DEVICE_CHANNEL(ch0_ce_count, S_IRUGO,
 317                    channel_ce_count_show, NULL, 0);
 318 DEVICE_CHANNEL(ch1_ce_count, S_IRUGO,
 319                    channel_ce_count_show, NULL, 1);
 320 DEVICE_CHANNEL(ch2_ce_count, S_IRUGO,
 321                    channel_ce_count_show, NULL, 2);
 322 DEVICE_CHANNEL(ch3_ce_count, S_IRUGO,
 323                    channel_ce_count_show, NULL, 3);
 324 DEVICE_CHANNEL(ch4_ce_count, S_IRUGO,
 325                    channel_ce_count_show, NULL, 4);
 326 DEVICE_CHANNEL(ch5_ce_count, S_IRUGO,
 327                    channel_ce_count_show, NULL, 5);
 328 DEVICE_CHANNEL(ch6_ce_count, S_IRUGO,
 329                    channel_ce_count_show, NULL, 6);
 330 DEVICE_CHANNEL(ch7_ce_count, S_IRUGO,
 331                    channel_ce_count_show, NULL, 7);
 332
 333 /* Total possible dynamic ce_count attribute file table */
 334 static struct attribute *dynamic_csrow_ce_count_attr[] = {
 335         &dev_attr_legacy_ch0_ce_count.attr.attr,
 336         &dev_attr_legacy_ch1_ce_count.attr.attr,
 337         &dev_attr_legacy_ch2_ce_count.attr.attr,
 338         &dev_attr_legacy_ch3_ce_count.attr.attr,
 339         &dev_attr_legacy_ch4_ce_count.attr.attr,
 340         &dev_attr_legacy_ch5_ce_count.attr.attr,
 341         &dev_attr_legacy_ch6_ce_count.attr.attr,
 342         &dev_attr_legacy_ch7_ce_count.attr.attr,
 343         NULL
 344 };
 345
 346 static umode_t csrow_dev_is_visible(struct kobject *kobj,
 347                                     struct attribute *attr, int idx)
 348 {
 349         struct device *dev = kobj_to_dev(kobj);
 350         struct csrow_info *csrow = container_of(dev, struct csrow_info, dev);
 351
 352         if (idx >= csrow->nr_channels)
 353                 return 0;
 354
 355         if (idx >= ARRAY_SIZE(dynamic_csrow_ce_count_attr) - 1) {
 356                 WARN_ONCE(1, "idx: %d\n", idx);
 357                 return 0;
 358         }
 359
 360         /* Only expose populated DIMMs */
 361         if (!csrow->channels[idx]->dimm->nr_pages)
 362                 return 0;
 363
 364         return attr->mode;
 365 }
 366
 367
 368 static const struct attribute_group csrow_dev_dimm_group = {
 369         .attrs = dynamic_csrow_dimm_attr,
 370         .is_visible = csrow_dev_is_visible,
 371 };
 372
 373 static const struct attribute_group csrow_dev_ce_count_group = {
 374         .attrs = dynamic_csrow_ce_count_attr,
 375         .is_visible = csrow_dev_is_visible,
 376 };
 377
 378 static const struct attribute_group *csrow_dev_groups[] = {
 379         &csrow_dev_dimm_group,
 380         &csrow_dev_ce_count_group,
 381         NULL
 382 };
 383
 384 static void csrow_release(struct device *dev)
 385 {
 386         /*
 387          * Nothing to do, just unregister sysfs here. The mci
 388          * device owns the data and will also release it.
 389          */
 390 }
 391
 392 static inline int nr_pages_per_csrow(struct csrow_info *csrow)
 393 {
 394         int chan, nr_pages = 0;
 395
 396         for (chan = 0; chan < csrow->nr_channels; chan++)
 397                 nr_pages += csrow->channels[chan]->dimm->nr_pages;
 398
 399         return nr_pages;
 400 }
 401
 402 /* Create a CSROW object under specifed edac_mc_device */
 403 static int edac_create_csrow_object(struct mem_ctl_info *mci,
 404                                     struct csrow_info *csrow, int index)
 405 {
 406         int err;
 407
 408         csrow->dev.type = &csrow_attr_type;
 409         csrow->dev.groups = csrow_dev_groups;
 410         csrow->dev.release = csrow_release;
 411         device_initialize(&csrow->dev);
 412         csrow->dev.parent = &mci->dev;
 413         csrow->mci = mci;
 414         dev_set_name(&csrow->dev, "csrow%d", index);
 415         dev_set_drvdata(&csrow->dev, csrow);
 416
 417         err = device_add(&csrow->dev);
 418         if (err) {
 419                 edac_dbg(1, "failure: create device %s\n", dev_name(&csrow->dev));
 420                 put_device(&csrow->dev);
 421                 return err;
 422         }
 423
 424         edac_dbg(0, "device %s created\n", dev_name(&csrow->dev));
 425
 426         return 0;
 427 }
 428
 429 /* Create a CSROW object under specifed edac_mc_device */
 430 static int edac_create_csrow_objects(struct mem_ctl_info *mci)
 431 {
 432         int err, i;
 433         struct csrow_info *csrow;
 434
 435         for (i = 0; i < mci->nr_csrows; i++) {
 436                 csrow = mci->csrows[i];
 437                 if (!nr_pages_per_csrow(csrow))
 438                         continue;
 439                 err = edac_create_csrow_object(mci, mci->csrows[i], i);
 440                 if (err < 0)
 441                         goto error;
 442         }
 443         return 0;
 444
 445 error:
 446         for (--i; i >= 0; i--) {
 447                 if (device_is_registered(&mci->csrows[i]->dev))
 448                         device_unregister(&mci->csrows[i]->dev);
 449         }
 450
 451         return err;
 452 }
 453
 454 static void edac_delete_csrow_objects(struct mem_ctl_info *mci)
 455 {
 456         int i;
 457
 458         for (i = 0; i < mci->nr_csrows; i++) {
 459                 if (device_is_registered(&mci->csrows[i]->dev))
 460                         device_unregister(&mci->csrows[i]->dev);
 461         }
 462 }
 463
 464 #endif
 465
 466 /*
 467  * Per-dimm (or per-rank) devices
 468  */
 469
 470 #define to_dimm(k) container_of(k, struct dimm_info, dev)
 471
 472 /* show/store functions for DIMM Label attributes */
 473 static ssize_t dimmdev_location_show(struct device *dev,
 474                                      struct device_attribute *mattr, char *data)
 475 {
 476         struct dimm_info *dimm = to_dimm(dev);
 477         ssize_t count;
 478
 479         count = edac_dimm_info_location(dimm, data, PAGE_SIZE);
 480         count += scnprintf(data + count, PAGE_SIZE - count, "\n");
 481
 482         return count;
 483 }
 484
 485 static ssize_t dimmdev_label_show(struct device *dev,
 486                                   struct device_attribute *mattr, char *data)
 487 {
 488         struct dimm_info *dimm = to_dimm(dev);
 489
 490         /* if field has not been initialized, there is nothing to send */
 491         if (!dimm->label[0])
 492                 return 0;
 493
 494         return snprintf(data, sizeof(dimm->label) + 1, "%s\n", dimm->label);
 495 }
 496
 497 static ssize_t dimmdev_label_store(struct device *dev,
 498                                    struct device_attribute *mattr,
 499                                    const char *data,
 500                                    size_t count)
 501 {
 502         struct dimm_info *dimm = to_dimm(dev);
 503         size_t copy_count = count;
 504
 505         if (count == 0)
 506                 return -EINVAL;
 507
 508         if (data[count - 1] == '\0' || data[count - 1] == '\n')
 509                 copy_count -= 1;
 510
 511         if (copy_count == 0 || copy_count >= sizeof(dimm->label))
 512                 return -EINVAL;
 513
 514         strncpy(dimm->label, data, copy_count);
 515         dimm->label[copy_count] = '\0';
 516
 517         return count;
 518 }
 519
 520 static ssize_t dimmdev_size_show(struct device *dev,
 521                                  struct device_attribute *mattr, char *data)
 522 {
 523         struct dimm_info *dimm = to_dimm(dev);
 524
 525         return sprintf(data, "%u\n", PAGES_TO_MiB(dimm->nr_pages));
 526 }
 527
 528 static ssize_t dimmdev_mem_type_show(struct device *dev,
 529                                      struct device_attribute *mattr, char *data)
 530 {
 531         struct dimm_info *dimm = to_dimm(dev);
 532
 533         return sprintf(data, "%s\n", edac_mem_types[dimm->mtype]);
 534 }
 535
 536 static ssize_t dimmdev_dev_type_show(struct device *dev,
 537                                      struct device_attribute *mattr, char *data)
 538 {
 539         struct dimm_info *dimm = to_dimm(dev);
 540
 541         return sprintf(data, "%s\n", dev_types[dimm->dtype]);
 542 }
 543
 544 static ssize_t dimmdev_edac_mode_show(struct device *dev,
 545                                       struct device_attribute *mattr,
 546                                       char *data)
 547 {
 548         struct dimm_info *dimm = to_dimm(dev);
 549
 550         return sprintf(data, "%s\n", edac_caps[dimm->edac_mode]);
 551 }
 552
 553 static ssize_t dimmdev_ce_count_show(struct device *dev,
 554                                       struct device_attribute *mattr,
 555                                       char *data)
 556 {
 557         struct dimm_info *dimm = to_dimm(dev);
 558
 559         return sprintf(data, "%u\n", dimm->ce_count);
 560 }
 561
 562 static ssize_t dimmdev_ue_count_show(struct device *dev,
 563                                       struct device_attribute *mattr,
 564                                       char *data)
 565 {
 566         struct dimm_info *dimm = to_dimm(dev);
 567
 568         return sprintf(data, "%u\n", dimm->ue_count);
 569 }
 570
 571 /* dimm/rank attribute files */
 572 static DEVICE_ATTR(dimm_label, S_IRUGO | S_IWUSR,
 573                    dimmdev_label_show, dimmdev_label_store);
 574 static DEVICE_ATTR(dimm_location, S_IRUGO, dimmdev_location_show, NULL);
 575 static DEVICE_ATTR(size, S_IRUGO, dimmdev_size_show, NULL);
 576 static DEVICE_ATTR(dimm_mem_type, S_IRUGO, dimmdev_mem_type_show, NULL);
 577 static DEVICE_ATTR(dimm_dev_type, S_IRUGO, dimmdev_dev_type_show, NULL);
 578 static DEVICE_ATTR(dimm_edac_mode, S_IRUGO, dimmdev_edac_mode_show, NULL);
 579 static DEVICE_ATTR(dimm_ce_count, S_IRUGO, dimmdev_ce_count_show, NULL);
 580 static DEVICE_ATTR(dimm_ue_count, S_IRUGO, dimmdev_ue_count_show, NULL);
 581
 582 /* attributes of the dimm<id>/rank<id> object */
 583 static struct attribute *dimm_attrs[] = {
 584         &dev_attr_dimm_label.attr,
 585         &dev_attr_dimm_location.attr,
 586         &dev_attr_size.attr,
 587         &dev_attr_dimm_mem_type.attr,
 588         &dev_attr_dimm_dev_type.attr,
 589         &dev_attr_dimm_edac_mode.attr,
 590         &dev_attr_dimm_ce_count.attr,
 591         &dev_attr_dimm_ue_count.attr,
 592         NULL,
 593 };
 594
 595 static const struct attribute_group dimm_attr_grp = {
 596         .attrs  = dimm_attrs,
 597 };
 598
 599 static const struct attribute_group *dimm_attr_groups[] = {
 600         &dimm_attr_grp,
 601         NULL
 602 };
 603
 604 static const struct device_type dimm_attr_type = {
 605         .groups         = dimm_attr_groups,
 606 };
 607
 608 static void dimm_release(struct device *dev)
 609 {
 610         /*
 611          * Nothing to do, just unregister sysfs here. The mci
 612          * device owns the data and will also release it.
 613          */
 614 }
 615
 616 /* Create a DIMM object under specifed memory controller device */
 617 static int edac_create_dimm_object(struct mem_ctl_info *mci,
 618                                    struct dimm_info *dimm)
 619 {
 620         int err;
 621         dimm->mci = mci;
 622
 623         dimm->dev.type = &dimm_attr_type;
 624         dimm->dev.release = dimm_release;
 625         device_initialize(&dimm->dev);
 626
 627         dimm->dev.parent = &mci->dev;
 628         if (mci->csbased)
 629                 dev_set_name(&dimm->dev, "rank%d", dimm->idx);
 630         else
 631                 dev_set_name(&dimm->dev, "dimm%d", dimm->idx);
 632         dev_set_drvdata(&dimm->dev, dimm);
 633         pm_runtime_forbid(&mci->dev);
 634
 635         err = device_add(&dimm->dev);
 636         if (err) {
 637                 edac_dbg(1, "failure: create device %s\n", dev_name(&dimm->dev));
 638                 put_device(&dimm->dev);
 639                 return err;
 640         }
 641
 642         if (IS_ENABLED(CONFIG_EDAC_DEBUG)) {
 643                 char location[80];
 644
 645                 edac_dimm_info_location(dimm, location, sizeof(location));
 646                 edac_dbg(0, "device %s created at location %s\n",
 647                         dev_name(&dimm->dev), location);
 648         }
 649
 650         return 0;
 651 }
 652
 653 /*
 654  * Memory controller device
 655  */
 656
 657 #define to_mci(k) container_of(k, struct mem_ctl_info, dev)
 658
 659 static ssize_t mci_reset_counters_store(struct device *dev,
 660                                         struct device_attribute *mattr,
 661                                         const char *data, size_t count)
 662 {
 663         struct mem_ctl_info *mci = to_mci(dev);
 664         struct dimm_info *dimm;
 665         int row, chan;
 666
 667         mci->ue_mc = 0;
 668         mci->ce_mc = 0;
 669         mci->ue_noinfo_count = 0;
 670         mci->ce_noinfo_count = 0;
 671
 672         for (row = 0; row < mci->nr_csrows; row++) {
 673                 struct csrow_info *ri = mci->csrows[row];
 674
 675                 ri->ue_count = 0;
 676                 ri->ce_count = 0;
 677
 678                 for (chan = 0; chan < ri->nr_channels; chan++)
 679                         ri->channels[chan]->ce_count = 0;
 680         }
 681
 682         mci_for_each_dimm(mci, dimm) {
 683                 dimm->ue_count = 0;
 684                 dimm->ce_count = 0;
 685         }
 686
 687         mci->start_time = jiffies;
 688         return count;
 689 }
 690
 691 /* Memory scrubbing interface:
 692  *
 693  * A MC driver can limit the scrubbing bandwidth based on the CPU type.
 694  * Therefore, ->set_sdram_scrub_rate should be made to return the actual
 695  * bandwidth that is accepted or 0 when scrubbing is to be disabled.
 696  *
 697  * Negative value still means that an error has occurred while setting
 698  * the scrub rate.
 699  */
 700 static ssize_t mci_sdram_scrub_rate_store(struct device *dev,
 701                                           struct device_attribute *mattr,
 702                                           const char *data, size_t count)
 703 {
 704         struct mem_ctl_info *mci = to_mci(dev);
 705         unsigned long bandwidth = 0;
 706         int new_bw = 0;
 707
 708         if (kstrtoul(data, 10, &bandwidth) < 0)
 709                 return -EINVAL;
 710
 711         new_bw = mci->set_sdram_scrub_rate(mci, bandwidth);
 712         if (new_bw < 0) {
 713                 edac_printk(KERN_WARNING, EDAC_MC,
 714                             "Error setting scrub rate to: %lu\n", bandwidth);
 715                 return -EINVAL;
 716         }
 717
 718         return count;
 719 }
 720
 721 /*
 722  * ->get_sdram_scrub_rate() return value semantics same as above.
 723  */
 724 static ssize_t mci_sdram_scrub_rate_show(struct device *dev,
 725                                          struct device_attribute *mattr,
 726                                          char *data)
 727 {
 728         struct mem_ctl_info *mci = to_mci(dev);
 729         int bandwidth = 0;
 730
 731         bandwidth = mci->get_sdram_scrub_rate(mci);
 732         if (bandwidth < 0) {
 733                 edac_printk(KERN_DEBUG, EDAC_MC, "Error reading scrub rate\n");
 734                 return bandwidth;
 735         }
 736
 737         return sprintf(data, "%d\n", bandwidth);
 738 }
 739
 740 /* default attribute files for the MCI object */
 741 static ssize_t mci_ue_count_show(struct device *dev,
 742                                  struct device_attribute *mattr,
 743                                  char *data)
 744 {
 745         struct mem_ctl_info *mci = to_mci(dev);
 746
 747         return sprintf(data, "%d\n", mci->ue_mc);
 748 }
 749
 750 static ssize_t mci_ce_count_show(struct device *dev,
 751                                  struct device_attribute *mattr,
 752                                  char *data)
 753 {
 754         struct mem_ctl_info *mci = to_mci(dev);
 755
 756         return sprintf(data, "%d\n", mci->ce_mc);
 757 }
 758
 759 static ssize_t mci_ce_noinfo_show(struct device *dev,
 760                                   struct device_attribute *mattr,
 761                                   char *data)
 762 {
 763         struct mem_ctl_info *mci = to_mci(dev);
 764
 765         return sprintf(data, "%d\n", mci->ce_noinfo_count);
 766 }
 767
 768 static ssize_t mci_ue_noinfo_show(struct device *dev,
 769                                   struct device_attribute *mattr,
 770                                   char *data)
 771 {
 772         struct mem_ctl_info *mci = to_mci(dev);
 773
 774         return sprintf(data, "%d\n", mci->ue_noinfo_count);
 775 }
 776
 777 static ssize_t mci_seconds_show(struct device *dev,
 778                                 struct device_attribute *mattr,
 779                                 char *data)
 780 {
 781         struct mem_ctl_info *mci = to_mci(dev);
 782
 783         return sprintf(data, "%ld\n", (jiffies - mci->start_time) / HZ);
 784 }
 785
 786 static ssize_t mci_ctl_name_show(struct device *dev,
 787                                  struct device_attribute *mattr,
 788                                  char *data)
 789 {
 790         struct mem_ctl_info *mci = to_mci(dev);
 791
 792         return sprintf(data, "%s\n", mci->ctl_name);
 793 }
 794
 795 static ssize_t mci_size_mb_show(struct device *dev,
 796                                 struct device_attribute *mattr,
 797                                 char *data)
 798 {
 799         struct mem_ctl_info *mci = to_mci(dev);
 800         int total_pages = 0, csrow_idx, j;
 801
 802         for (csrow_idx = 0; csrow_idx < mci->nr_csrows; csrow_idx++) {
 803                 struct csrow_info *csrow = mci->csrows[csrow_idx];
 804
 805                 for (j = 0; j < csrow->nr_channels; j++) {
 806                         struct dimm_info *dimm = csrow->channels[j]->dimm;
 807
 808                         total_pages += dimm->nr_pages;
 809                 }
 810         }
 811
 812         return sprintf(data, "%u\n", PAGES_TO_MiB(total_pages));
 813 }
 814
 815 static ssize_t mci_max_location_show(struct device *dev,
 816                                      struct device_attribute *mattr,
 817                                      char *data)
 818 {
 819         struct mem_ctl_info *mci = to_mci(dev);
 820         int len = PAGE_SIZE;
 821         char *p = data;
 822         int i, n;
 823
 824         for (i = 0; i < mci->n_layers; i++) {
 825                 n = scnprintf(p, len, "%s %d ",
 826                               edac_layer_name[mci->layers[i].type],
 827                               mci->layers[i].size - 1);
 828                 len -= n;
 829                 if (len <= 0)
 830                         goto out;
 831
 832                 p += n;
 833         }
 834
 835         p += scnprintf(p, len, "\n");
 836 out:
 837         return p - data;
 838 }
 839
 840 /* default Control file */
 841 static DEVICE_ATTR(reset_counters, S_IWUSR, NULL, mci_reset_counters_store);
 842
 843 /* default Attribute files */
 844 static DEVICE_ATTR(mc_name, S_IRUGO, mci_ctl_name_show, NULL);
 845 static DEVICE_ATTR(size_mb, S_IRUGO, mci_size_mb_show, NULL);
 846 static DEVICE_ATTR(seconds_since_reset, S_IRUGO, mci_seconds_show, NULL);
 847 static DEVICE_ATTR(ue_noinfo_count, S_IRUGO, mci_ue_noinfo_show, NULL);
 848 static DEVICE_ATTR(ce_noinfo_count, S_IRUGO, mci_ce_noinfo_show, NULL);
 849 static DEVICE_ATTR(ue_count, S_IRUGO, mci_ue_count_show, NULL);
 850 static DEVICE_ATTR(ce_count, S_IRUGO, mci_ce_count_show, NULL);
 851 static DEVICE_ATTR(max_location, S_IRUGO, mci_max_location_show, NULL);
 852
 853 /* memory scrubber attribute file */
 854 static DEVICE_ATTR(sdram_scrub_rate, 0, mci_sdram_scrub_rate_show,
 855             mci_sdram_scrub_rate_store); /* umode set later in is_visible */
 856
 857 static struct attribute *mci_attrs[] = {
 858         &dev_attr_reset_counters.attr,
 859         &dev_attr_mc_name.attr,
 860         &dev_attr_size_mb.attr,
 861         &dev_attr_seconds_since_reset.attr,
 862         &dev_attr_ue_noinfo_count.attr,
 863         &dev_attr_ce_noinfo_count.attr,
 864         &dev_attr_ue_count.attr,
 865         &dev_attr_ce_count.attr,
 866         &dev_attr_max_location.attr,
 867         &dev_attr_sdram_scrub_rate.attr,
 868         NULL
 869 };
 870
 871 static umode_t mci_attr_is_visible(struct kobject *kobj,
 872                                    struct attribute *attr, int idx)
 873 {
 874         struct device *dev = kobj_to_dev(kobj);
 875         struct mem_ctl_info *mci = to_mci(dev);
 876         umode_t mode = 0;
 877
 878         if (attr != &dev_attr_sdram_scrub_rate.attr)
 879                 return attr->mode;
 880         if (mci->get_sdram_scrub_rate)
 881                 mode |= S_IRUGO;
 882         if (mci->set_sdram_scrub_rate)
 883                 mode |= S_IWUSR;
 884         return mode;
 885 }
 886
 887 static const struct attribute_group mci_attr_grp = {
 888         .attrs  = mci_attrs,
 889         .is_visible = mci_attr_is_visible,
 890 };
 891
 892 static const struct attribute_group *mci_attr_groups[] = {
 893         &mci_attr_grp,
 894         NULL
 895 };
 896
 897 static const struct device_type mci_attr_type = {
 898         .groups         = mci_attr_groups,
 899 };
 900
 901 /*
 902  * Create a new Memory Controller kobject instance,
 903  *      mc<id> under the 'mc' directory
 904  *
 905  * Return:
 906  *      0       Success
 907  *      !0      Failure
 908  */
 909 int edac_create_sysfs_mci_device(struct mem_ctl_info *mci,
 910                                  const struct attribute_group **groups)
 911 {
 912         struct dimm_info *dimm;
 913         int err;
 914
 915         /* get the /sys/devices/system/edac subsys reference */
 916         mci->dev.type = &mci_attr_type;
 917         mci->dev.parent = mci_pdev;
 918         mci->dev.groups = groups;
 919         dev_set_name(&mci->dev, "mc%d", mci->mc_idx);
 920         dev_set_drvdata(&mci->dev, mci);
 921         pm_runtime_forbid(&mci->dev);
 922
 923         err = device_add(&mci->dev);
 924         if (err < 0) {
 925                 edac_dbg(1, "failure: create device %s\n", dev_name(&mci->dev));
 926                 /* no put_device() here, free mci with _edac_mc_free() */
 927                 return err;
 928         }
 929
 930         edac_dbg(0, "device %s created\n", dev_name(&mci->dev));
 931
 932         /*
 933          * Create the dimm/rank devices
 934          */
 935         mci_for_each_dimm(mci, dimm) {
 936                 /* Only expose populated DIMMs */
 937                 if (!dimm->nr_pages)
 938                         continue;
 939
 940                 err = edac_create_dimm_object(mci, dimm);
 941                 if (err)
 942                         goto fail;
 943         }
 944
 945 #ifdef CONFIG_EDAC_LEGACY_SYSFS
 946         err = edac_create_csrow_objects(mci);
 947         if (err < 0)
 948                 goto fail;
 949 #endif
 950
 951         edac_create_debugfs_nodes(mci);
 952         return 0;
 953
 954 fail:
 955         edac_remove_sysfs_mci_device(mci);
 956
 957         return err;
 958 }
 959
 960 /*
 961  * remove a Memory Controller instance
 962  */
 963 void edac_remove_sysfs_mci_device(struct mem_ctl_info *mci)
 964 {
 965         struct dimm_info *dimm;
 966
 967         if (!device_is_registered(&mci->dev))
 968                 return;
 969
 970         edac_dbg(0, "\n");
 971
 972 #ifdef CONFIG_EDAC_DEBUG
 973         edac_debugfs_remove_recursive(mci->debugfs);
 974 #endif
 975 #ifdef CONFIG_EDAC_LEGACY_SYSFS
 976         edac_delete_csrow_objects(mci);
 977 #endif
 978
 979         mci_for_each_dimm(mci, dimm) {
 980                 if (!device_is_registered(&dimm->dev))
 981                         continue;
 982                 edac_dbg(1, "unregistering device %s\n", dev_name(&dimm->dev));
 983                 device_unregister(&dimm->dev);
 984         }
 985
 986         /* only remove the device, but keep mci */
 987         device_del(&mci->dev);
 988 }
 989
 990 static void mc_attr_release(struct device *dev)
 991 {
 992         /*
 993          * There's no container structure here, as this is just the mci
 994          * parent device, used to create the /sys/devices/mc sysfs node.
 995          * So, there are no attributes on it.
 996          */
 997         edac_dbg(1, "device %s released\n", dev_name(dev));
 998         kfree(dev);
 999 }
1000
1001 /*
1002  * Init/exit code for the module. Basically, creates/removes /sys/class/rc
1003  */
1004 int __init edac_mc_sysfs_init(void)
1005 {
1006         int err;
1007
1008         mci_pdev = kzalloc(sizeof(*mci_pdev), GFP_KERNEL);
1009         if (!mci_pdev)
1010                 return -ENOMEM;
1011
1012         mci_pdev->bus = edac_get_sysfs_subsys();
1013         mci_pdev->release = mc_attr_release;
1014         mci_pdev->init_name = "mc";
1015
1016         err = device_register(mci_pdev);
1017         if (err < 0) {
1018                 edac_dbg(1, "failure: create device %s\n", dev_name(mci_pdev));
1019                 put_device(mci_pdev);
1020                 return err;
1021         }
1022
1023         edac_dbg(0, "device %s created\n", dev_name(mci_pdev));
1024
1025         return 0;
1026 }
1027
1028 void edac_mc_sysfs_exit(void)
1029 {
1030         device_unregister(mci_pdev);
1031 }