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         struct csrow_info *csrow = container_of(dev, struct csrow_info, dev);
 280
 281         edac_dbg(1, "device %s released\n", dev_name(dev));
 282         kfree(csrow);
 283 }
 284
 285 static const struct device_type csrow_attr_type = {
 286         .groups         = csrow_attr_groups,
 287         .release        = csrow_attr_release,
 288 };
 289
 290 /*
 291  * possible dynamic channel DIMM Label attribute files
 292  *
 293  */
 294 DEVICE_CHANNEL(ch0_dimm_label, S_IRUGO | S_IWUSR,
 295         channel_dimm_label_show, channel_dimm_label_store, 0);
 296 DEVICE_CHANNEL(ch1_dimm_label, S_IRUGO | S_IWUSR,
 297         channel_dimm_label_show, channel_dimm_label_store, 1);
 298 DEVICE_CHANNEL(ch2_dimm_label, S_IRUGO | S_IWUSR,
 299         channel_dimm_label_show, channel_dimm_label_store, 2);
 300 DEVICE_CHANNEL(ch3_dimm_label, S_IRUGO | S_IWUSR,
 301         channel_dimm_label_show, channel_dimm_label_store, 3);
 302 DEVICE_CHANNEL(ch4_dimm_label, S_IRUGO | S_IWUSR,
 303         channel_dimm_label_show, channel_dimm_label_store, 4);
 304 DEVICE_CHANNEL(ch5_dimm_label, S_IRUGO | S_IWUSR,
 305         channel_dimm_label_show, channel_dimm_label_store, 5);
 306 DEVICE_CHANNEL(ch6_dimm_label, S_IRUGO | S_IWUSR,
 307         channel_dimm_label_show, channel_dimm_label_store, 6);
 308 DEVICE_CHANNEL(ch7_dimm_label, S_IRUGO | S_IWUSR,
 309         channel_dimm_label_show, channel_dimm_label_store, 7);
 310
 311 /* Total possible dynamic DIMM Label attribute file table */
 312 static struct attribute *dynamic_csrow_dimm_attr[] = {
 313         &dev_attr_legacy_ch0_dimm_label.attr.attr,
 314         &dev_attr_legacy_ch1_dimm_label.attr.attr,
 315         &dev_attr_legacy_ch2_dimm_label.attr.attr,
 316         &dev_attr_legacy_ch3_dimm_label.attr.attr,
 317         &dev_attr_legacy_ch4_dimm_label.attr.attr,
 318         &dev_attr_legacy_ch5_dimm_label.attr.attr,
 319         &dev_attr_legacy_ch6_dimm_label.attr.attr,
 320         &dev_attr_legacy_ch7_dimm_label.attr.attr,
 321         NULL
 322 };
 323
 324 /* possible dynamic channel ce_count attribute files */
 325 DEVICE_CHANNEL(ch0_ce_count, S_IRUGO,
 326                    channel_ce_count_show, NULL, 0);
 327 DEVICE_CHANNEL(ch1_ce_count, S_IRUGO,
 328                    channel_ce_count_show, NULL, 1);
 329 DEVICE_CHANNEL(ch2_ce_count, S_IRUGO,
 330                    channel_ce_count_show, NULL, 2);
 331 DEVICE_CHANNEL(ch3_ce_count, S_IRUGO,
 332                    channel_ce_count_show, NULL, 3);
 333 DEVICE_CHANNEL(ch4_ce_count, S_IRUGO,
 334                    channel_ce_count_show, NULL, 4);
 335 DEVICE_CHANNEL(ch5_ce_count, S_IRUGO,
 336                    channel_ce_count_show, NULL, 5);
 337 DEVICE_CHANNEL(ch6_ce_count, S_IRUGO,
 338                    channel_ce_count_show, NULL, 6);
 339 DEVICE_CHANNEL(ch7_ce_count, S_IRUGO,
 340                    channel_ce_count_show, NULL, 7);
 341
 342 /* Total possible dynamic ce_count attribute file table */
 343 static struct attribute *dynamic_csrow_ce_count_attr[] = {
 344         &dev_attr_legacy_ch0_ce_count.attr.attr,
 345         &dev_attr_legacy_ch1_ce_count.attr.attr,
 346         &dev_attr_legacy_ch2_ce_count.attr.attr,
 347         &dev_attr_legacy_ch3_ce_count.attr.attr,
 348         &dev_attr_legacy_ch4_ce_count.attr.attr,
 349         &dev_attr_legacy_ch5_ce_count.attr.attr,
 350         &dev_attr_legacy_ch6_ce_count.attr.attr,
 351         &dev_attr_legacy_ch7_ce_count.attr.attr,
 352         NULL
 353 };
 354
 355 static umode_t csrow_dev_is_visible(struct kobject *kobj,
 356                                     struct attribute *attr, int idx)
 357 {
 358         struct device *dev = kobj_to_dev(kobj);
 359         struct csrow_info *csrow = container_of(dev, struct csrow_info, dev);
 360
 361         if (idx >= csrow->nr_channels)
 362                 return 0;
 363
 364         if (idx >= ARRAY_SIZE(dynamic_csrow_ce_count_attr) - 1) {
 365                 WARN_ONCE(1, "idx: %d\n", idx);
 366                 return 0;
 367         }
 368
 369         /* Only expose populated DIMMs */
 370         if (!csrow->channels[idx]->dimm->nr_pages)
 371                 return 0;
 372
 373         return attr->mode;
 374 }
 375
 376
 377 static const struct attribute_group csrow_dev_dimm_group = {
 378         .attrs = dynamic_csrow_dimm_attr,
 379         .is_visible = csrow_dev_is_visible,
 380 };
 381
 382 static const struct attribute_group csrow_dev_ce_count_group = {
 383         .attrs = dynamic_csrow_ce_count_attr,
 384         .is_visible = csrow_dev_is_visible,
 385 };
 386
 387 static const struct attribute_group *csrow_dev_groups[] = {
 388         &csrow_dev_dimm_group,
 389         &csrow_dev_ce_count_group,
 390         NULL
 391 };
 392
 393 static inline int nr_pages_per_csrow(struct csrow_info *csrow)
 394 {
 395         int chan, nr_pages = 0;
 396
 397         for (chan = 0; chan < csrow->nr_channels; chan++)
 398                 nr_pages += csrow->channels[chan]->dimm->nr_pages;
 399
 400         return nr_pages;
 401 }
 402
 403 /* Create a CSROW object under specifed edac_mc_device */
 404 static int edac_create_csrow_object(struct mem_ctl_info *mci,
 405                                     struct csrow_info *csrow, int index)
 406 {
 407         int err;
 408
 409         csrow->dev.type = &csrow_attr_type;
 410         csrow->dev.groups = csrow_dev_groups;
 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                 csrow = mci->csrows[i];
 448                 if (!nr_pages_per_csrow(csrow))
 449                         continue;
 450
 451                 device_del(&mci->csrows[i]->dev);
 452         }
 453
 454         return err;
 455 }
 456
 457 static void edac_delete_csrow_objects(struct mem_ctl_info *mci)
 458 {
 459         int i;
 460         struct csrow_info *csrow;
 461
 462         for (i = mci->nr_csrows - 1; i >= 0; i--) {
 463                 csrow = mci->csrows[i];
 464                 if (!nr_pages_per_csrow(csrow))
 465                         continue;
 466                 device_unregister(&mci->csrows[i]->dev);
 467         }
 468 }
 469 #endif
 470
 471 /*
 472  * Per-dimm (or per-rank) devices
 473  */
 474
 475 #define to_dimm(k) container_of(k, struct dimm_info, dev)
 476
 477 /* show/store functions for DIMM Label attributes */
 478 static ssize_t dimmdev_location_show(struct device *dev,
 479                                      struct device_attribute *mattr, char *data)
 480 {
 481         struct dimm_info *dimm = to_dimm(dev);
 482
 483         return edac_dimm_info_location(dimm, data, PAGE_SIZE);
 484 }
 485
 486 static ssize_t dimmdev_label_show(struct device *dev,
 487                                   struct device_attribute *mattr, char *data)
 488 {
 489         struct dimm_info *dimm = to_dimm(dev);
 490
 491         /* if field has not been initialized, there is nothing to send */
 492         if (!dimm->label[0])
 493                 return 0;
 494
 495         return snprintf(data, sizeof(dimm->label) + 1, "%s\n", dimm->label);
 496 }
 497
 498 static ssize_t dimmdev_label_store(struct device *dev,
 499                                    struct device_attribute *mattr,
 500                                    const char *data,
 501                                    size_t count)
 502 {
 503         struct dimm_info *dimm = to_dimm(dev);
 504         size_t copy_count = count;
 505
 506         if (count == 0)
 507                 return -EINVAL;
 508
 509         if (data[count - 1] == '\0' || data[count - 1] == '\n')
 510                 copy_count -= 1;
 511
 512         if (copy_count == 0 || copy_count >= sizeof(dimm->label))
 513                 return -EINVAL;
 514
 515         strncpy(dimm->label, data, copy_count);
 516         dimm->label[copy_count] = '\0';
 517
 518         return count;
 519 }
 520
 521 static ssize_t dimmdev_size_show(struct device *dev,
 522                                  struct device_attribute *mattr, char *data)
 523 {
 524         struct dimm_info *dimm = to_dimm(dev);
 525
 526         return sprintf(data, "%u\n", PAGES_TO_MiB(dimm->nr_pages));
 527 }
 528
 529 static ssize_t dimmdev_mem_type_show(struct device *dev,
 530                                      struct device_attribute *mattr, char *data)
 531 {
 532         struct dimm_info *dimm = to_dimm(dev);
 533
 534         return sprintf(data, "%s\n", edac_mem_types[dimm->mtype]);
 535 }
 536
 537 static ssize_t dimmdev_dev_type_show(struct device *dev,
 538                                      struct device_attribute *mattr, char *data)
 539 {
 540         struct dimm_info *dimm = to_dimm(dev);
 541
 542         return sprintf(data, "%s\n", dev_types[dimm->dtype]);
 543 }
 544
 545 static ssize_t dimmdev_edac_mode_show(struct device *dev,
 546                                       struct device_attribute *mattr,
 547                                       char *data)
 548 {
 549         struct dimm_info *dimm = to_dimm(dev);
 550
 551         return sprintf(data, "%s\n", edac_caps[dimm->edac_mode]);
 552 }
 553
 554 static ssize_t dimmdev_ce_count_show(struct device *dev,
 555                                       struct device_attribute *mattr,
 556                                       char *data)
 557 {
 558         struct dimm_info *dimm = to_dimm(dev);
 559         u32 count;
 560         int off;
 561
 562         off = EDAC_DIMM_OFF(dimm->mci->layers,
 563                             dimm->mci->n_layers,
 564                             dimm->location[0],
 565                             dimm->location[1],
 566                             dimm->location[2]);
 567         count = dimm->mci->ce_per_layer[dimm->mci->n_layers-1][off];
 568         return sprintf(data, "%u\n", count);
 569 }
 570
 571 static ssize_t dimmdev_ue_count_show(struct device *dev,
 572                                       struct device_attribute *mattr,
 573                                       char *data)
 574 {
 575         struct dimm_info *dimm = to_dimm(dev);
 576         u32 count;
 577         int off;
 578
 579         off = EDAC_DIMM_OFF(dimm->mci->layers,
 580                             dimm->mci->n_layers,
 581                             dimm->location[0],
 582                             dimm->location[1],
 583                             dimm->location[2]);
 584         count = dimm->mci->ue_per_layer[dimm->mci->n_layers-1][off];
 585         return sprintf(data, "%u\n", count);
 586 }
 587
 588 /* dimm/rank attribute files */
 589 static DEVICE_ATTR(dimm_label, S_IRUGO | S_IWUSR,
 590                    dimmdev_label_show, dimmdev_label_store);
 591 static DEVICE_ATTR(dimm_location, S_IRUGO, dimmdev_location_show, NULL);
 592 static DEVICE_ATTR(size, S_IRUGO, dimmdev_size_show, NULL);
 593 static DEVICE_ATTR(dimm_mem_type, S_IRUGO, dimmdev_mem_type_show, NULL);
 594 static DEVICE_ATTR(dimm_dev_type, S_IRUGO, dimmdev_dev_type_show, NULL);
 595 static DEVICE_ATTR(dimm_edac_mode, S_IRUGO, dimmdev_edac_mode_show, NULL);
 596 static DEVICE_ATTR(dimm_ce_count, S_IRUGO, dimmdev_ce_count_show, NULL);
 597 static DEVICE_ATTR(dimm_ue_count, S_IRUGO, dimmdev_ue_count_show, NULL);
 598
 599 /* attributes of the dimm<id>/rank<id> object */
 600 static struct attribute *dimm_attrs[] = {
 601         &dev_attr_dimm_label.attr,
 602         &dev_attr_dimm_location.attr,
 603         &dev_attr_size.attr,
 604         &dev_attr_dimm_mem_type.attr,
 605         &dev_attr_dimm_dev_type.attr,
 606         &dev_attr_dimm_edac_mode.attr,
 607         &dev_attr_dimm_ce_count.attr,
 608         &dev_attr_dimm_ue_count.attr,
 609         NULL,
 610 };
 611
 612 static const struct attribute_group dimm_attr_grp = {
 613         .attrs  = dimm_attrs,
 614 };
 615
 616 static const struct attribute_group *dimm_attr_groups[] = {
 617         &dimm_attr_grp,
 618         NULL
 619 };
 620
 621 static void dimm_attr_release(struct device *dev)
 622 {
 623         struct dimm_info *dimm = container_of(dev, struct dimm_info, dev);
 624
 625         edac_dbg(1, "device %s released\n", dev_name(dev));
 626         kfree(dimm);
 627 }
 628
 629 static const struct device_type dimm_attr_type = {
 630         .groups         = dimm_attr_groups,
 631         .release        = dimm_attr_release,
 632 };
 633
 634 /* Create a DIMM object under specifed memory controller device */
 635 static int edac_create_dimm_object(struct mem_ctl_info *mci,
 636                                    struct dimm_info *dimm,
 637                                    int index)
 638 {
 639         int err;
 640         dimm->mci = mci;
 641
 642         dimm->dev.type = &dimm_attr_type;
 643         device_initialize(&dimm->dev);
 644
 645         dimm->dev.parent = &mci->dev;
 646         if (mci->csbased)
 647                 dev_set_name(&dimm->dev, "rank%d", index);
 648         else
 649                 dev_set_name(&dimm->dev, "dimm%d", index);
 650         dev_set_drvdata(&dimm->dev, dimm);
 651         pm_runtime_forbid(&mci->dev);
 652
 653         err = device_add(&dimm->dev);
 654         if (err) {
 655                 edac_dbg(1, "failure: create device %s\n", dev_name(&dimm->dev));
 656                 put_device(&dimm->dev);
 657                 return err;
 658         }
 659
 660         if (IS_ENABLED(CONFIG_EDAC_DEBUG)) {
 661                 char location[80];
 662
 663                 edac_dimm_info_location(dimm, location, sizeof(location));
 664                 edac_dbg(0, "device %s created at location %s\n",
 665                         dev_name(&dimm->dev), location);
 666         }
 667
 668         return 0;
 669 }
 670
 671 /*
 672  * Memory controller device
 673  */
 674
 675 #define to_mci(k) container_of(k, struct mem_ctl_info, dev)
 676
 677 static ssize_t mci_reset_counters_store(struct device *dev,
 678                                         struct device_attribute *mattr,
 679                                         const char *data, size_t count)
 680 {
 681         struct mem_ctl_info *mci = to_mci(dev);
 682         int cnt, row, chan, i;
 683         mci->ue_mc = 0;
 684         mci->ce_mc = 0;
 685         mci->ue_noinfo_count = 0;
 686         mci->ce_noinfo_count = 0;
 687
 688         for (row = 0; row < mci->nr_csrows; row++) {
 689                 struct csrow_info *ri = mci->csrows[row];
 690
 691                 ri->ue_count = 0;
 692                 ri->ce_count = 0;
 693
 694                 for (chan = 0; chan < ri->nr_channels; chan++)
 695                         ri->channels[chan]->ce_count = 0;
 696         }
 697
 698         cnt = 1;
 699         for (i = 0; i < mci->n_layers; i++) {
 700                 cnt *= mci->layers[i].size;
 701                 memset(mci->ce_per_layer[i], 0, cnt * sizeof(u32));
 702                 memset(mci->ue_per_layer[i], 0, cnt * sizeof(u32));
 703         }
 704
 705         mci->start_time = jiffies;
 706         return count;
 707 }
 708
 709 /* Memory scrubbing interface:
 710  *
 711  * A MC driver can limit the scrubbing bandwidth based on the CPU type.
 712  * Therefore, ->set_sdram_scrub_rate should be made to return the actual
 713  * bandwidth that is accepted or 0 when scrubbing is to be disabled.
 714  *
 715  * Negative value still means that an error has occurred while setting
 716  * the scrub rate.
 717  */
 718 static ssize_t mci_sdram_scrub_rate_store(struct device *dev,
 719                                           struct device_attribute *mattr,
 720                                           const char *data, size_t count)
 721 {
 722         struct mem_ctl_info *mci = to_mci(dev);
 723         unsigned long bandwidth = 0;
 724         int new_bw = 0;
 725
 726         if (kstrtoul(data, 10, &bandwidth) < 0)
 727                 return -EINVAL;
 728
 729         new_bw = mci->set_sdram_scrub_rate(mci, bandwidth);
 730         if (new_bw < 0) {
 731                 edac_printk(KERN_WARNING, EDAC_MC,
 732                             "Error setting scrub rate to: %lu\n", bandwidth);
 733                 return -EINVAL;
 734         }
 735
 736         return count;
 737 }
 738
 739 /*
 740  * ->get_sdram_scrub_rate() return value semantics same as above.
 741  */
 742 static ssize_t mci_sdram_scrub_rate_show(struct device *dev,
 743                                          struct device_attribute *mattr,
 744                                          char *data)
 745 {
 746         struct mem_ctl_info *mci = to_mci(dev);
 747         int bandwidth = 0;
 748
 749         bandwidth = mci->get_sdram_scrub_rate(mci);
 750         if (bandwidth < 0) {
 751                 edac_printk(KERN_DEBUG, EDAC_MC, "Error reading scrub rate\n");
 752                 return bandwidth;
 753         }
 754
 755         return sprintf(data, "%d\n", bandwidth);
 756 }
 757
 758 /* default attribute files for the MCI object */
 759 static ssize_t mci_ue_count_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->ue_mc);
 766 }
 767
 768 static ssize_t mci_ce_count_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->ce_mc);
 775 }
 776
 777 static ssize_t mci_ce_noinfo_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, "%d\n", mci->ce_noinfo_count);
 784 }
 785
 786 static ssize_t mci_ue_noinfo_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, "%d\n", mci->ue_noinfo_count);
 793 }
 794
 795 static ssize_t mci_seconds_show(struct device *dev,
 796                                 struct device_attribute *mattr,
 797                                 char *data)
 798 {
 799         struct mem_ctl_info *mci = to_mci(dev);
 800
 801         return sprintf(data, "%ld\n", (jiffies - mci->start_time) / HZ);
 802 }
 803
 804 static ssize_t mci_ctl_name_show(struct device *dev,
 805                                  struct device_attribute *mattr,
 806                                  char *data)
 807 {
 808         struct mem_ctl_info *mci = to_mci(dev);
 809
 810         return sprintf(data, "%s\n", mci->ctl_name);
 811 }
 812
 813 static ssize_t mci_size_mb_show(struct device *dev,
 814                                 struct device_attribute *mattr,
 815                                 char *data)
 816 {
 817         struct mem_ctl_info *mci = to_mci(dev);
 818         int total_pages = 0, csrow_idx, j;
 819
 820         for (csrow_idx = 0; csrow_idx < mci->nr_csrows; csrow_idx++) {
 821                 struct csrow_info *csrow = mci->csrows[csrow_idx];
 822
 823                 for (j = 0; j < csrow->nr_channels; j++) {
 824                         struct dimm_info *dimm = csrow->channels[j]->dimm;
 825
 826                         total_pages += dimm->nr_pages;
 827                 }
 828         }
 829
 830         return sprintf(data, "%u\n", PAGES_TO_MiB(total_pages));
 831 }
 832
 833 static ssize_t mci_max_location_show(struct device *dev,
 834                                      struct device_attribute *mattr,
 835                                      char *data)
 836 {
 837         struct mem_ctl_info *mci = to_mci(dev);
 838         int i;
 839         char *p = data;
 840
 841         for (i = 0; i < mci->n_layers; i++) {
 842                 p += sprintf(p, "%s %d ",
 843                              edac_layer_name[mci->layers[i].type],
 844                              mci->layers[i].size - 1);
 845         }
 846
 847         return p - data;
 848 }
 849
 850 /* default Control file */
 851 static DEVICE_ATTR(reset_counters, S_IWUSR, NULL, mci_reset_counters_store);
 852
 853 /* default Attribute files */
 854 static DEVICE_ATTR(mc_name, S_IRUGO, mci_ctl_name_show, NULL);
 855 static DEVICE_ATTR(size_mb, S_IRUGO, mci_size_mb_show, NULL);
 856 static DEVICE_ATTR(seconds_since_reset, S_IRUGO, mci_seconds_show, NULL);
 857 static DEVICE_ATTR(ue_noinfo_count, S_IRUGO, mci_ue_noinfo_show, NULL);
 858 static DEVICE_ATTR(ce_noinfo_count, S_IRUGO, mci_ce_noinfo_show, NULL);
 859 static DEVICE_ATTR(ue_count, S_IRUGO, mci_ue_count_show, NULL);
 860 static DEVICE_ATTR(ce_count, S_IRUGO, mci_ce_count_show, NULL);
 861 static DEVICE_ATTR(max_location, S_IRUGO, mci_max_location_show, NULL);
 862
 863 /* memory scrubber attribute file */
 864 static DEVICE_ATTR(sdram_scrub_rate, 0, mci_sdram_scrub_rate_show,
 865             mci_sdram_scrub_rate_store); /* umode set later in is_visible */
 866
 867 static struct attribute *mci_attrs[] = {
 868         &dev_attr_reset_counters.attr,
 869         &dev_attr_mc_name.attr,
 870         &dev_attr_size_mb.attr,
 871         &dev_attr_seconds_since_reset.attr,
 872         &dev_attr_ue_noinfo_count.attr,
 873         &dev_attr_ce_noinfo_count.attr,
 874         &dev_attr_ue_count.attr,
 875         &dev_attr_ce_count.attr,
 876         &dev_attr_max_location.attr,
 877         &dev_attr_sdram_scrub_rate.attr,
 878         NULL
 879 };
 880
 881 static umode_t mci_attr_is_visible(struct kobject *kobj,
 882                                    struct attribute *attr, int idx)
 883 {
 884         struct device *dev = kobj_to_dev(kobj);
 885         struct mem_ctl_info *mci = to_mci(dev);
 886         umode_t mode = 0;
 887
 888         if (attr != &dev_attr_sdram_scrub_rate.attr)
 889                 return attr->mode;
 890         if (mci->get_sdram_scrub_rate)
 891                 mode |= S_IRUGO;
 892         if (mci->set_sdram_scrub_rate)
 893                 mode |= S_IWUSR;
 894         return mode;
 895 }
 896
 897 static const struct attribute_group mci_attr_grp = {
 898         .attrs  = mci_attrs,
 899         .is_visible = mci_attr_is_visible,
 900 };
 901
 902 static const struct attribute_group *mci_attr_groups[] = {
 903         &mci_attr_grp,
 904         NULL
 905 };
 906
 907 static void mci_attr_release(struct device *dev)
 908 {
 909         struct mem_ctl_info *mci = container_of(dev, struct mem_ctl_info, dev);
 910
 911         edac_dbg(1, "device %s released\n", dev_name(dev));
 912         kfree(mci);
 913 }
 914
 915 static const struct device_type mci_attr_type = {
 916         .groups         = mci_attr_groups,
 917         .release        = mci_attr_release,
 918 };
 919
 920 /*
 921  * Create a new Memory Controller kobject instance,
 922  *      mc<id> under the 'mc' directory
 923  *
 924  * Return:
 925  *      0       Success
 926  *      !0      Failure
 927  */
 928 int edac_create_sysfs_mci_device(struct mem_ctl_info *mci,
 929                                  const struct attribute_group **groups)
 930 {
 931         int i, err;
 932
 933         /* get the /sys/devices/system/edac subsys reference */
 934         mci->dev.type = &mci_attr_type;
 935         device_initialize(&mci->dev);
 936
 937         mci->dev.parent = mci_pdev;
 938         mci->dev.groups = groups;
 939         dev_set_name(&mci->dev, "mc%d", mci->mc_idx);
 940         dev_set_drvdata(&mci->dev, mci);
 941         pm_runtime_forbid(&mci->dev);
 942
 943         err = device_add(&mci->dev);
 944         if (err < 0) {
 945                 edac_dbg(1, "failure: create device %s\n", dev_name(&mci->dev));
 946                 put_device(&mci->dev);
 947                 return err;
 948         }
 949
 950         edac_dbg(0, "device %s created\n", dev_name(&mci->dev));
 951
 952         /*
 953          * Create the dimm/rank devices
 954          */
 955         for (i = 0; i < mci->tot_dimms; i++) {
 956                 struct dimm_info *dimm = mci->dimms[i];
 957                 /* Only expose populated DIMMs */
 958                 if (!dimm->nr_pages)
 959                         continue;
 960
 961                 err = edac_create_dimm_object(mci, dimm, i);
 962                 if (err)
 963                         goto fail_unregister_dimm;
 964         }
 965
 966 #ifdef CONFIG_EDAC_LEGACY_SYSFS
 967         err = edac_create_csrow_objects(mci);
 968         if (err < 0)
 969                 goto fail_unregister_dimm;
 970 #endif
 971
 972         edac_create_debugfs_nodes(mci);
 973         return 0;
 974
 975 fail_unregister_dimm:
 976         for (i--; i >= 0; i--) {
 977                 struct dimm_info *dimm = mci->dimms[i];
 978                 if (!dimm->nr_pages)
 979                         continue;
 980
 981                 device_unregister(&dimm->dev);
 982         }
 983         device_unregister(&mci->dev);
 984
 985         return err;
 986 }
 987
 988 /*
 989  * remove a Memory Controller instance
 990  */
 991 void edac_remove_sysfs_mci_device(struct mem_ctl_info *mci)
 992 {
 993         int i;
 994
 995         edac_dbg(0, "\n");
 996
 997 #ifdef CONFIG_EDAC_DEBUG
 998         edac_debugfs_remove_recursive(mci->debugfs);
 999 #endif
1000 #ifdef CONFIG_EDAC_LEGACY_SYSFS
1001         edac_delete_csrow_objects(mci);
1002 #endif
1003
1004         for (i = 0; i < mci->tot_dimms; i++) {
1005                 struct dimm_info *dimm = mci->dimms[i];
1006                 if (dimm->nr_pages == 0)
1007                         continue;
1008                 edac_dbg(1, "unregistering device %s\n", dev_name(&dimm->dev));
1009                 device_unregister(&dimm->dev);
1010         }
1011 }
1012
1013 void edac_unregister_sysfs(struct mem_ctl_info *mci)
1014 {
1015         edac_dbg(1, "unregistering device %s\n", dev_name(&mci->dev));
1016         device_unregister(&mci->dev);
1017 }
1018
1019 static void mc_attr_release(struct device *dev)
1020 {
1021         /*
1022          * There's no container structure here, as this is just the mci
1023          * parent device, used to create the /sys/devices/mc sysfs node.
1024          * So, there are no attributes on it.
1025          */
1026         edac_dbg(1, "device %s released\n", dev_name(dev));
1027         kfree(dev);
1028 }
1029
1030 static const struct device_type mc_attr_type = {
1031         .release        = mc_attr_release,
1032 };
1033 /*
1034  * Init/exit code for the module. Basically, creates/removes /sys/class/rc
1035  */
1036 int __init edac_mc_sysfs_init(void)
1037 {
1038         int err;
1039
1040         mci_pdev = kzalloc(sizeof(*mci_pdev), GFP_KERNEL);
1041         if (!mci_pdev)
1042                 return -ENOMEM;
1043
1044         mci_pdev->bus = edac_get_sysfs_subsys();
1045         mci_pdev->type = &mc_attr_type;
1046         device_initialize(mci_pdev);
1047         dev_set_name(mci_pdev, "mc");
1048
1049         err = device_add(mci_pdev);
1050         if (err < 0) {
1051                 edac_dbg(1, "failure: create device %s\n", dev_name(mci_pdev));
1052                 put_device(mci_pdev);
1053                 return err;
1054         }
1055
1056         edac_dbg(0, "device %s created\n", dev_name(mci_pdev));
1057
1058         return 0;
1059 }
1060
1061 void edac_mc_sysfs_exit(void)
1062 {
1063         device_unregister(mci_pdev);
1064 }