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 void csrow_attr_release(struct device *dev)
 278 {
 279         /* release device with _edac_mc_free() */
 280 }
 281
 282 static const struct device_type csrow_attr_type = {
 283         .groups         = csrow_attr_groups,
 284         .release        = csrow_attr_release,
 285 };
 286
 287 /*
 288  * possible dynamic channel DIMM Label attribute files
 289  *
 290  */
 291 DEVICE_CHANNEL(ch0_dimm_label, S_IRUGO | S_IWUSR,
 292         channel_dimm_label_show, channel_dimm_label_store, 0);
 293 DEVICE_CHANNEL(ch1_dimm_label, S_IRUGO | S_IWUSR,
 294         channel_dimm_label_show, channel_dimm_label_store, 1);
 295 DEVICE_CHANNEL(ch2_dimm_label, S_IRUGO | S_IWUSR,
 296         channel_dimm_label_show, channel_dimm_label_store, 2);
 297 DEVICE_CHANNEL(ch3_dimm_label, S_IRUGO | S_IWUSR,
 298         channel_dimm_label_show, channel_dimm_label_store, 3);
 299 DEVICE_CHANNEL(ch4_dimm_label, S_IRUGO | S_IWUSR,
 300         channel_dimm_label_show, channel_dimm_label_store, 4);
 301 DEVICE_CHANNEL(ch5_dimm_label, S_IRUGO | S_IWUSR,
 302         channel_dimm_label_show, channel_dimm_label_store, 5);
 303 DEVICE_CHANNEL(ch6_dimm_label, S_IRUGO | S_IWUSR,
 304         channel_dimm_label_show, channel_dimm_label_store, 6);
 305 DEVICE_CHANNEL(ch7_dimm_label, S_IRUGO | S_IWUSR,
 306         channel_dimm_label_show, channel_dimm_label_store, 7);
 307
 308 /* Total possible dynamic DIMM Label attribute file table */
 309 static struct attribute *dynamic_csrow_dimm_attr[] = {
 310         &dev_attr_legacy_ch0_dimm_label.attr.attr,
 311         &dev_attr_legacy_ch1_dimm_label.attr.attr,
 312         &dev_attr_legacy_ch2_dimm_label.attr.attr,
 313         &dev_attr_legacy_ch3_dimm_label.attr.attr,
 314         &dev_attr_legacy_ch4_dimm_label.attr.attr,
 315         &dev_attr_legacy_ch5_dimm_label.attr.attr,
 316         &dev_attr_legacy_ch6_dimm_label.attr.attr,
 317         &dev_attr_legacy_ch7_dimm_label.attr.attr,
 318         NULL
 319 };
 320
 321 /* possible dynamic channel ce_count attribute files */
 322 DEVICE_CHANNEL(ch0_ce_count, S_IRUGO,
 323                    channel_ce_count_show, NULL, 0);
 324 DEVICE_CHANNEL(ch1_ce_count, S_IRUGO,
 325                    channel_ce_count_show, NULL, 1);
 326 DEVICE_CHANNEL(ch2_ce_count, S_IRUGO,
 327                    channel_ce_count_show, NULL, 2);
 328 DEVICE_CHANNEL(ch3_ce_count, S_IRUGO,
 329                    channel_ce_count_show, NULL, 3);
 330 DEVICE_CHANNEL(ch4_ce_count, S_IRUGO,
 331                    channel_ce_count_show, NULL, 4);
 332 DEVICE_CHANNEL(ch5_ce_count, S_IRUGO,
 333                    channel_ce_count_show, NULL, 5);
 334 DEVICE_CHANNEL(ch6_ce_count, S_IRUGO,
 335                    channel_ce_count_show, NULL, 6);
 336 DEVICE_CHANNEL(ch7_ce_count, S_IRUGO,
 337                    channel_ce_count_show, NULL, 7);
 338
 339 /* Total possible dynamic ce_count attribute file table */
 340 static struct attribute *dynamic_csrow_ce_count_attr[] = {
 341         &dev_attr_legacy_ch0_ce_count.attr.attr,
 342         &dev_attr_legacy_ch1_ce_count.attr.attr,
 343         &dev_attr_legacy_ch2_ce_count.attr.attr,
 344         &dev_attr_legacy_ch3_ce_count.attr.attr,
 345         &dev_attr_legacy_ch4_ce_count.attr.attr,
 346         &dev_attr_legacy_ch5_ce_count.attr.attr,
 347         &dev_attr_legacy_ch6_ce_count.attr.attr,
 348         &dev_attr_legacy_ch7_ce_count.attr.attr,
 349         NULL
 350 };
 351
 352 static umode_t csrow_dev_is_visible(struct kobject *kobj,
 353                                     struct attribute *attr, int idx)
 354 {
 355         struct device *dev = kobj_to_dev(kobj);
 356         struct csrow_info *csrow = container_of(dev, struct csrow_info, dev);
 357
 358         if (idx >= csrow->nr_channels)
 359                 return 0;
 360
 361         if (idx >= ARRAY_SIZE(dynamic_csrow_ce_count_attr) - 1) {
 362                 WARN_ONCE(1, "idx: %d\n", idx);
 363                 return 0;
 364         }
 365
 366         /* Only expose populated DIMMs */
 367         if (!csrow->channels[idx]->dimm->nr_pages)
 368                 return 0;
 369
 370         return attr->mode;
 371 }
 372
 373
 374 static const struct attribute_group csrow_dev_dimm_group = {
 375         .attrs = dynamic_csrow_dimm_attr,
 376         .is_visible = csrow_dev_is_visible,
 377 };
 378
 379 static const struct attribute_group csrow_dev_ce_count_group = {
 380         .attrs = dynamic_csrow_ce_count_attr,
 381         .is_visible = csrow_dev_is_visible,
 382 };
 383
 384 static const struct attribute_group *csrow_dev_groups[] = {
 385         &csrow_dev_dimm_group,
 386         &csrow_dev_ce_count_group,
 387         NULL
 388 };
 389
 390 static inline int nr_pages_per_csrow(struct csrow_info *csrow)
 391 {
 392         int chan, nr_pages = 0;
 393
 394         for (chan = 0; chan < csrow->nr_channels; chan++)
 395                 nr_pages += csrow->channels[chan]->dimm->nr_pages;
 396
 397         return nr_pages;
 398 }
 399
 400 /* Create a CSROW object under specifed edac_mc_device */
 401 static int edac_create_csrow_object(struct mem_ctl_info *mci,
 402                                     struct csrow_info *csrow, int index)
 403 {
 404         int err;
 405
 406         csrow->dev.type = &csrow_attr_type;
 407         csrow->dev.groups = csrow_dev_groups;
 408         device_initialize(&csrow->dev);
 409         csrow->dev.parent = &mci->dev;
 410         csrow->mci = mci;
 411         dev_set_name(&csrow->dev, "csrow%d", index);
 412         dev_set_drvdata(&csrow->dev, csrow);
 413
 414         err = device_add(&csrow->dev);
 415         if (err) {
 416                 edac_dbg(1, "failure: create device %s\n", dev_name(&csrow->dev));
 417                 put_device(&csrow->dev);
 418                 return err;
 419         }
 420
 421         edac_dbg(0, "device %s created\n", dev_name(&csrow->dev));
 422
 423         return 0;
 424 }
 425
 426 /* Create a CSROW object under specifed edac_mc_device */
 427 static int edac_create_csrow_objects(struct mem_ctl_info *mci)
 428 {
 429         int err, i;
 430         struct csrow_info *csrow;
 431
 432         for (i = 0; i < mci->nr_csrows; i++) {
 433                 csrow = mci->csrows[i];
 434                 if (!nr_pages_per_csrow(csrow))
 435                         continue;
 436                 err = edac_create_csrow_object(mci, mci->csrows[i], i);
 437                 if (err < 0)
 438                         goto error;
 439         }
 440         return 0;
 441
 442 error:
 443         for (--i; i >= 0; i--) {
 444                 csrow = mci->csrows[i];
 445                 if (!nr_pages_per_csrow(csrow))
 446                         continue;
 447
 448                 device_del(&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         struct csrow_info *csrow;
 458
 459         for (i = mci->nr_csrows - 1; i >= 0; i--) {
 460                 csrow = mci->csrows[i];
 461                 if (!nr_pages_per_csrow(csrow))
 462                         continue;
 463                 device_unregister(&mci->csrows[i]->dev);
 464         }
 465 }
 466 #endif
 467
 468 /*
 469  * Per-dimm (or per-rank) devices
 470  */
 471
 472 #define to_dimm(k) container_of(k, struct dimm_info, dev)
 473
 474 /* show/store functions for DIMM Label attributes */
 475 static ssize_t dimmdev_location_show(struct device *dev,
 476                                      struct device_attribute *mattr, char *data)
 477 {
 478         struct dimm_info *dimm = to_dimm(dev);
 479
 480         return edac_dimm_info_location(dimm, data, PAGE_SIZE);
 481 }
 482
 483 static ssize_t dimmdev_label_show(struct device *dev,
 484                                   struct device_attribute *mattr, char *data)
 485 {
 486         struct dimm_info *dimm = to_dimm(dev);
 487
 488         /* if field has not been initialized, there is nothing to send */
 489         if (!dimm->label[0])
 490                 return 0;
 491
 492         return snprintf(data, sizeof(dimm->label) + 1, "%s\n", dimm->label);
 493 }
 494
 495 static ssize_t dimmdev_label_store(struct device *dev,
 496                                    struct device_attribute *mattr,
 497                                    const char *data,
 498                                    size_t count)
 499 {
 500         struct dimm_info *dimm = to_dimm(dev);
 501         size_t copy_count = count;
 502
 503         if (count == 0)
 504                 return -EINVAL;
 505
 506         if (data[count - 1] == '\0' || data[count - 1] == '\n')
 507                 copy_count -= 1;
 508
 509         if (copy_count == 0 || copy_count >= sizeof(dimm->label))
 510                 return -EINVAL;
 511
 512         strncpy(dimm->label, data, copy_count);
 513         dimm->label[copy_count] = '\0';
 514
 515         return count;
 516 }
 517
 518 static ssize_t dimmdev_size_show(struct device *dev,
 519                                  struct device_attribute *mattr, char *data)
 520 {
 521         struct dimm_info *dimm = to_dimm(dev);
 522
 523         return sprintf(data, "%u\n", PAGES_TO_MiB(dimm->nr_pages));
 524 }
 525
 526 static ssize_t dimmdev_mem_type_show(struct device *dev,
 527                                      struct device_attribute *mattr, char *data)
 528 {
 529         struct dimm_info *dimm = to_dimm(dev);
 530
 531         return sprintf(data, "%s\n", edac_mem_types[dimm->mtype]);
 532 }
 533
 534 static ssize_t dimmdev_dev_type_show(struct device *dev,
 535                                      struct device_attribute *mattr, char *data)
 536 {
 537         struct dimm_info *dimm = to_dimm(dev);
 538
 539         return sprintf(data, "%s\n", dev_types[dimm->dtype]);
 540 }
 541
 542 static ssize_t dimmdev_edac_mode_show(struct device *dev,
 543                                       struct device_attribute *mattr,
 544                                       char *data)
 545 {
 546         struct dimm_info *dimm = to_dimm(dev);
 547
 548         return sprintf(data, "%s\n", edac_caps[dimm->edac_mode]);
 549 }
 550
 551 static ssize_t dimmdev_ce_count_show(struct device *dev,
 552                                       struct device_attribute *mattr,
 553                                       char *data)
 554 {
 555         struct dimm_info *dimm = to_dimm(dev);
 556         u32 count;
 557
 558         count = dimm->mci->ce_per_layer[dimm->mci->n_layers-1][dimm->idx];
 559         return sprintf(data, "%u\n", 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         u32 count;
 568
 569         count = dimm->mci->ue_per_layer[dimm->mci->n_layers-1][dimm->idx];
 570         return sprintf(data, "%u\n", count);
 571 }
 572
 573 /* dimm/rank attribute files */
 574 static DEVICE_ATTR(dimm_label, S_IRUGO | S_IWUSR,
 575                    dimmdev_label_show, dimmdev_label_store);
 576 static DEVICE_ATTR(dimm_location, S_IRUGO, dimmdev_location_show, NULL);
 577 static DEVICE_ATTR(size, S_IRUGO, dimmdev_size_show, NULL);
 578 static DEVICE_ATTR(dimm_mem_type, S_IRUGO, dimmdev_mem_type_show, NULL);
 579 static DEVICE_ATTR(dimm_dev_type, S_IRUGO, dimmdev_dev_type_show, NULL);
 580 static DEVICE_ATTR(dimm_edac_mode, S_IRUGO, dimmdev_edac_mode_show, NULL);
 581 static DEVICE_ATTR(dimm_ce_count, S_IRUGO, dimmdev_ce_count_show, NULL);
 582 static DEVICE_ATTR(dimm_ue_count, S_IRUGO, dimmdev_ue_count_show, NULL);
 583
 584 /* attributes of the dimm<id>/rank<id> object */
 585 static struct attribute *dimm_attrs[] = {
 586         &dev_attr_dimm_label.attr,
 587         &dev_attr_dimm_location.attr,
 588         &dev_attr_size.attr,
 589         &dev_attr_dimm_mem_type.attr,
 590         &dev_attr_dimm_dev_type.attr,
 591         &dev_attr_dimm_edac_mode.attr,
 592         &dev_attr_dimm_ce_count.attr,
 593         &dev_attr_dimm_ue_count.attr,
 594         NULL,
 595 };
 596
 597 static const struct attribute_group dimm_attr_grp = {
 598         .attrs  = dimm_attrs,
 599 };
 600
 601 static const struct attribute_group *dimm_attr_groups[] = {
 602         &dimm_attr_grp,
 603         NULL
 604 };
 605
 606 static void dimm_attr_release(struct device *dev)
 607 {
 608         /* release device with _edac_mc_free() */
 609 }
 610
 611 static const struct device_type dimm_attr_type = {
 612         .groups         = dimm_attr_groups,
 613         .release        = dimm_attr_release,
 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         device_initialize(&dimm->dev);
 625
 626         dimm->dev.parent = &mci->dev;
 627         if (mci->csbased)
 628                 dev_set_name(&dimm->dev, "rank%d", dimm->idx);
 629         else
 630                 dev_set_name(&dimm->dev, "dimm%d", dimm->idx);
 631         dev_set_drvdata(&dimm->dev, dimm);
 632         pm_runtime_forbid(&mci->dev);
 633
 634         err = device_add(&dimm->dev);
 635         if (err) {
 636                 edac_dbg(1, "failure: create device %s\n", dev_name(&dimm->dev));
 637                 put_device(&dimm->dev);
 638                 return err;
 639         }
 640
 641         if (IS_ENABLED(CONFIG_EDAC_DEBUG)) {
 642                 char location[80];
 643
 644                 edac_dimm_info_location(dimm, location, sizeof(location));
 645                 edac_dbg(0, "device %s created at location %s\n",
 646                         dev_name(&dimm->dev), location);
 647         }
 648
 649         return 0;
 650 }
 651
 652 /*
 653  * Memory controller device
 654  */
 655
 656 #define to_mci(k) container_of(k, struct mem_ctl_info, dev)
 657
 658 static ssize_t mci_reset_counters_store(struct device *dev,
 659                                         struct device_attribute *mattr,
 660                                         const char *data, size_t count)
 661 {
 662         struct mem_ctl_info *mci = to_mci(dev);
 663         int cnt, row, chan, i;
 664         mci->ue_mc = 0;
 665         mci->ce_mc = 0;
 666         mci->ue_noinfo_count = 0;
 667         mci->ce_noinfo_count = 0;
 668
 669         for (row = 0; row < mci->nr_csrows; row++) {
 670                 struct csrow_info *ri = mci->csrows[row];
 671
 672                 ri->ue_count = 0;
 673                 ri->ce_count = 0;
 674
 675                 for (chan = 0; chan < ri->nr_channels; chan++)
 676                         ri->channels[chan]->ce_count = 0;
 677         }
 678
 679         cnt = 1;
 680         for (i = 0; i < mci->n_layers; i++) {
 681                 cnt *= mci->layers[i].size;
 682                 memset(mci->ce_per_layer[i], 0, cnt * sizeof(u32));
 683                 memset(mci->ue_per_layer[i], 0, cnt * sizeof(u32));
 684         }
 685
 686         mci->start_time = jiffies;
 687         return count;
 688 }
 689
 690 /* Memory scrubbing interface:
 691  *
 692  * A MC driver can limit the scrubbing bandwidth based on the CPU type.
 693  * Therefore, ->set_sdram_scrub_rate should be made to return the actual
 694  * bandwidth that is accepted or 0 when scrubbing is to be disabled.
 695  *
 696  * Negative value still means that an error has occurred while setting
 697  * the scrub rate.
 698  */
 699 static ssize_t mci_sdram_scrub_rate_store(struct device *dev,
 700                                           struct device_attribute *mattr,
 701                                           const char *data, size_t count)
 702 {
 703         struct mem_ctl_info *mci = to_mci(dev);
 704         unsigned long bandwidth = 0;
 705         int new_bw = 0;
 706
 707         if (kstrtoul(data, 10, &bandwidth) < 0)
 708                 return -EINVAL;
 709
 710         new_bw = mci->set_sdram_scrub_rate(mci, bandwidth);
 711         if (new_bw < 0) {
 712                 edac_printk(KERN_WARNING, EDAC_MC,
 713                             "Error setting scrub rate to: %lu\n", bandwidth);
 714                 return -EINVAL;
 715         }
 716
 717         return count;
 718 }
 719
 720 /*
 721  * ->get_sdram_scrub_rate() return value semantics same as above.
 722  */
 723 static ssize_t mci_sdram_scrub_rate_show(struct device *dev,
 724                                          struct device_attribute *mattr,
 725                                          char *data)
 726 {
 727         struct mem_ctl_info *mci = to_mci(dev);
 728         int bandwidth = 0;
 729
 730         bandwidth = mci->get_sdram_scrub_rate(mci);
 731         if (bandwidth < 0) {
 732                 edac_printk(KERN_DEBUG, EDAC_MC, "Error reading scrub rate\n");
 733                 return bandwidth;
 734         }
 735
 736         return sprintf(data, "%d\n", bandwidth);
 737 }
 738
 739 /* default attribute files for the MCI object */
 740 static ssize_t mci_ue_count_show(struct device *dev,
 741                                  struct device_attribute *mattr,
 742                                  char *data)
 743 {
 744         struct mem_ctl_info *mci = to_mci(dev);
 745
 746         return sprintf(data, "%d\n", mci->ue_mc);
 747 }
 748
 749 static ssize_t mci_ce_count_show(struct device *dev,
 750                                  struct device_attribute *mattr,
 751                                  char *data)
 752 {
 753         struct mem_ctl_info *mci = to_mci(dev);
 754
 755         return sprintf(data, "%d\n", mci->ce_mc);
 756 }
 757
 758 static ssize_t mci_ce_noinfo_show(struct device *dev,
 759                                   struct device_attribute *mattr,
 760                                   char *data)
 761 {
 762         struct mem_ctl_info *mci = to_mci(dev);
 763
 764         return sprintf(data, "%d\n", mci->ce_noinfo_count);
 765 }
 766
 767 static ssize_t mci_ue_noinfo_show(struct device *dev,
 768                                   struct device_attribute *mattr,
 769                                   char *data)
 770 {
 771         struct mem_ctl_info *mci = to_mci(dev);
 772
 773         return sprintf(data, "%d\n", mci->ue_noinfo_count);
 774 }
 775
 776 static ssize_t mci_seconds_show(struct device *dev,
 777                                 struct device_attribute *mattr,
 778                                 char *data)
 779 {
 780         struct mem_ctl_info *mci = to_mci(dev);
 781
 782         return sprintf(data, "%ld\n", (jiffies - mci->start_time) / HZ);
 783 }
 784
 785 static ssize_t mci_ctl_name_show(struct device *dev,
 786                                  struct device_attribute *mattr,
 787                                  char *data)
 788 {
 789         struct mem_ctl_info *mci = to_mci(dev);
 790
 791         return sprintf(data, "%s\n", mci->ctl_name);
 792 }
 793
 794 static ssize_t mci_size_mb_show(struct device *dev,
 795                                 struct device_attribute *mattr,
 796                                 char *data)
 797 {
 798         struct mem_ctl_info *mci = to_mci(dev);
 799         int total_pages = 0, csrow_idx, j;
 800
 801         for (csrow_idx = 0; csrow_idx < mci->nr_csrows; csrow_idx++) {
 802                 struct csrow_info *csrow = mci->csrows[csrow_idx];
 803
 804                 for (j = 0; j < csrow->nr_channels; j++) {
 805                         struct dimm_info *dimm = csrow->channels[j]->dimm;
 806
 807                         total_pages += dimm->nr_pages;
 808                 }
 809         }
 810
 811         return sprintf(data, "%u\n", PAGES_TO_MiB(total_pages));
 812 }
 813
 814 static ssize_t mci_max_location_show(struct device *dev,
 815                                      struct device_attribute *mattr,
 816                                      char *data)
 817 {
 818         struct mem_ctl_info *mci = to_mci(dev);
 819         int i;
 820         char *p = data;
 821
 822         for (i = 0; i < mci->n_layers; i++) {
 823                 p += sprintf(p, "%s %d ",
 824                              edac_layer_name[mci->layers[i].type],
 825                              mci->layers[i].size - 1);
 826         }
 827
 828         return p - data;
 829 }
 830
 831 /* default Control file */
 832 static DEVICE_ATTR(reset_counters, S_IWUSR, NULL, mci_reset_counters_store);
 833
 834 /* default Attribute files */
 835 static DEVICE_ATTR(mc_name, S_IRUGO, mci_ctl_name_show, NULL);
 836 static DEVICE_ATTR(size_mb, S_IRUGO, mci_size_mb_show, NULL);
 837 static DEVICE_ATTR(seconds_since_reset, S_IRUGO, mci_seconds_show, NULL);
 838 static DEVICE_ATTR(ue_noinfo_count, S_IRUGO, mci_ue_noinfo_show, NULL);
 839 static DEVICE_ATTR(ce_noinfo_count, S_IRUGO, mci_ce_noinfo_show, NULL);
 840 static DEVICE_ATTR(ue_count, S_IRUGO, mci_ue_count_show, NULL);
 841 static DEVICE_ATTR(ce_count, S_IRUGO, mci_ce_count_show, NULL);
 842 static DEVICE_ATTR(max_location, S_IRUGO, mci_max_location_show, NULL);
 843
 844 /* memory scrubber attribute file */
 845 static DEVICE_ATTR(sdram_scrub_rate, 0, mci_sdram_scrub_rate_show,
 846             mci_sdram_scrub_rate_store); /* umode set later in is_visible */
 847
 848 static struct attribute *mci_attrs[] = {
 849         &dev_attr_reset_counters.attr,
 850         &dev_attr_mc_name.attr,
 851         &dev_attr_size_mb.attr,
 852         &dev_attr_seconds_since_reset.attr,
 853         &dev_attr_ue_noinfo_count.attr,
 854         &dev_attr_ce_noinfo_count.attr,
 855         &dev_attr_ue_count.attr,
 856         &dev_attr_ce_count.attr,
 857         &dev_attr_max_location.attr,
 858         &dev_attr_sdram_scrub_rate.attr,
 859         NULL
 860 };
 861
 862 static umode_t mci_attr_is_visible(struct kobject *kobj,
 863                                    struct attribute *attr, int idx)
 864 {
 865         struct device *dev = kobj_to_dev(kobj);
 866         struct mem_ctl_info *mci = to_mci(dev);
 867         umode_t mode = 0;
 868
 869         if (attr != &dev_attr_sdram_scrub_rate.attr)
 870                 return attr->mode;
 871         if (mci->get_sdram_scrub_rate)
 872                 mode |= S_IRUGO;
 873         if (mci->set_sdram_scrub_rate)
 874                 mode |= S_IWUSR;
 875         return mode;
 876 }
 877
 878 static const struct attribute_group mci_attr_grp = {
 879         .attrs  = mci_attrs,
 880         .is_visible = mci_attr_is_visible,
 881 };
 882
 883 static const struct attribute_group *mci_attr_groups[] = {
 884         &mci_attr_grp,
 885         NULL
 886 };
 887
 888 static void mci_attr_release(struct device *dev)
 889 {
 890         /* release device with _edac_mc_free() */
 891 }
 892
 893 static const struct device_type mci_attr_type = {
 894         .groups         = mci_attr_groups,
 895         .release        = mci_attr_release,
 896 };
 897
 898 /*
 899  * Create a new Memory Controller kobject instance,
 900  *      mc<id> under the 'mc' directory
 901  *
 902  * Return:
 903  *      0       Success
 904  *      !0      Failure
 905  */
 906 int edac_create_sysfs_mci_device(struct mem_ctl_info *mci,
 907                                  const struct attribute_group **groups)
 908 {
 909         struct dimm_info *dimm;
 910         int err;
 911
 912         /* get the /sys/devices/system/edac subsys reference */
 913         mci->dev.type = &mci_attr_type;
 914         device_initialize(&mci->dev);
 915
 916         mci->dev.parent = mci_pdev;
 917         mci->dev.groups = groups;
 918         dev_set_name(&mci->dev, "mc%d", mci->mc_idx);
 919         dev_set_drvdata(&mci->dev, mci);
 920         pm_runtime_forbid(&mci->dev);
 921
 922         err = device_add(&mci->dev);
 923         if (err < 0) {
 924                 edac_dbg(1, "failure: create device %s\n", dev_name(&mci->dev));
 925                 put_device(&mci->dev);
 926                 return err;
 927         }
 928
 929         edac_dbg(0, "device %s created\n", dev_name(&mci->dev));
 930
 931         /*
 932          * Create the dimm/rank devices
 933          */
 934         mci_for_each_dimm(mci, dimm) {
 935                 /* Only expose populated DIMMs */
 936                 if (!dimm->nr_pages)
 937                         continue;
 938
 939                 err = edac_create_dimm_object(mci, dimm);
 940                 if (err)
 941                         goto fail_unregister_dimm;
 942         }
 943
 944 #ifdef CONFIG_EDAC_LEGACY_SYSFS
 945         err = edac_create_csrow_objects(mci);
 946         if (err < 0)
 947                 goto fail_unregister_dimm;
 948 #endif
 949
 950         edac_create_debugfs_nodes(mci);
 951         return 0;
 952
 953 fail_unregister_dimm:
 954         mci_for_each_dimm(mci, dimm) {
 955                 if (device_is_registered(&dimm->dev))
 956                         device_unregister(&dimm->dev);
 957         }
 958         device_unregister(&mci->dev);
 959
 960         return err;
 961 }
 962
 963 /*
 964  * remove a Memory Controller instance
 965  */
 966 void edac_remove_sysfs_mci_device(struct mem_ctl_info *mci)
 967 {
 968         struct dimm_info *dimm;
 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 (dimm->nr_pages == 0)
 981                         continue;
 982                 edac_dbg(1, "unregistering device %s\n", dev_name(&dimm->dev));
 983                 device_unregister(&dimm->dev);
 984         }
 985 }
 986
 987 void edac_unregister_sysfs(struct mem_ctl_info *mci)
 988 {
 989         edac_dbg(1, "unregistering device %s\n", dev_name(&mci->dev));
 990         device_unregister(&mci->dev);
 991 }
 992
 993 static void mc_attr_release(struct device *dev)
 994 {
 995         /*
 996          * There's no container structure here, as this is just the mci
 997          * parent device, used to create the /sys/devices/mc sysfs node.
 998          * So, there are no attributes on it.
 999          */
1000         edac_dbg(1, "device %s released\n", dev_name(dev));
1001         kfree(dev);
1002 }
1003
1004 static const struct device_type mc_attr_type = {
1005         .release        = mc_attr_release,
1006 };
1007 /*
1008  * Init/exit code for the module. Basically, creates/removes /sys/class/rc
1009  */
1010 int __init edac_mc_sysfs_init(void)
1011 {
1012         int err;
1013
1014         mci_pdev = kzalloc(sizeof(*mci_pdev), GFP_KERNEL);
1015         if (!mci_pdev)
1016                 return -ENOMEM;
1017
1018         mci_pdev->bus = edac_get_sysfs_subsys();
1019         mci_pdev->type = &mc_attr_type;
1020         device_initialize(mci_pdev);
1021         dev_set_name(mci_pdev, "mc");
1022
1023         err = device_add(mci_pdev);
1024         if (err < 0) {
1025                 edac_dbg(1, "failure: create device %s\n", dev_name(mci_pdev));
1026                 put_device(mci_pdev);
1027                 return err;
1028         }
1029
1030         edac_dbg(0, "device %s created\n", dev_name(mci_pdev));
1031
1032         return 0;
1033 }
1034
1035 void edac_mc_sysfs_exit(void)
1036 {
1037         device_unregister(mci_pdev);
1038 }