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
 561         count = dimm->mci->ce_per_layer[dimm->mci->n_layers-1][dimm->idx];
 562         return sprintf(data, "%u\n", count);
 563 }
 564
 565 static ssize_t dimmdev_ue_count_show(struct device *dev,
 566                                       struct device_attribute *mattr,
 567                                       char *data)
 568 {
 569         struct dimm_info *dimm = to_dimm(dev);
 570         u32 count;
 571
 572         count = dimm->mci->ue_per_layer[dimm->mci->n_layers-1][dimm->idx];
 573         return sprintf(data, "%u\n", count);
 574 }
 575
 576 /* dimm/rank attribute files */
 577 static DEVICE_ATTR(dimm_label, S_IRUGO | S_IWUSR,
 578                    dimmdev_label_show, dimmdev_label_store);
 579 static DEVICE_ATTR(dimm_location, S_IRUGO, dimmdev_location_show, NULL);
 580 static DEVICE_ATTR(size, S_IRUGO, dimmdev_size_show, NULL);
 581 static DEVICE_ATTR(dimm_mem_type, S_IRUGO, dimmdev_mem_type_show, NULL);
 582 static DEVICE_ATTR(dimm_dev_type, S_IRUGO, dimmdev_dev_type_show, NULL);
 583 static DEVICE_ATTR(dimm_edac_mode, S_IRUGO, dimmdev_edac_mode_show, NULL);
 584 static DEVICE_ATTR(dimm_ce_count, S_IRUGO, dimmdev_ce_count_show, NULL);
 585 static DEVICE_ATTR(dimm_ue_count, S_IRUGO, dimmdev_ue_count_show, NULL);
 586
 587 /* attributes of the dimm<id>/rank<id> object */
 588 static struct attribute *dimm_attrs[] = {
 589         &dev_attr_dimm_label.attr,
 590         &dev_attr_dimm_location.attr,
 591         &dev_attr_size.attr,
 592         &dev_attr_dimm_mem_type.attr,
 593         &dev_attr_dimm_dev_type.attr,
 594         &dev_attr_dimm_edac_mode.attr,
 595         &dev_attr_dimm_ce_count.attr,
 596         &dev_attr_dimm_ue_count.attr,
 597         NULL,
 598 };
 599
 600 static const struct attribute_group dimm_attr_grp = {
 601         .attrs  = dimm_attrs,
 602 };
 603
 604 static const struct attribute_group *dimm_attr_groups[] = {
 605         &dimm_attr_grp,
 606         NULL
 607 };
 608
 609 static void dimm_attr_release(struct device *dev)
 610 {
 611         struct dimm_info *dimm = container_of(dev, struct dimm_info, dev);
 612
 613         edac_dbg(1, "device %s released\n", dev_name(dev));
 614         kfree(dimm);
 615 }
 616
 617 static const struct device_type dimm_attr_type = {
 618         .groups         = dimm_attr_groups,
 619         .release        = dimm_attr_release,
 620 };
 621
 622 /* Create a DIMM object under specifed memory controller device */
 623 static int edac_create_dimm_object(struct mem_ctl_info *mci,
 624                                    struct dimm_info *dimm)
 625 {
 626         int err;
 627         dimm->mci = mci;
 628
 629         dimm->dev.type = &dimm_attr_type;
 630         device_initialize(&dimm->dev);
 631
 632         dimm->dev.parent = &mci->dev;
 633         if (mci->csbased)
 634                 dev_set_name(&dimm->dev, "rank%d", dimm->idx);
 635         else
 636                 dev_set_name(&dimm->dev, "dimm%d", dimm->idx);
 637         dev_set_drvdata(&dimm->dev, dimm);
 638         pm_runtime_forbid(&mci->dev);
 639
 640         err = device_add(&dimm->dev);
 641         if (err) {
 642                 edac_dbg(1, "failure: create device %s\n", dev_name(&dimm->dev));
 643                 put_device(&dimm->dev);
 644                 return err;
 645         }
 646
 647         if (IS_ENABLED(CONFIG_EDAC_DEBUG)) {
 648                 char location[80];
 649
 650                 edac_dimm_info_location(dimm, location, sizeof(location));
 651                 edac_dbg(0, "device %s created at location %s\n",
 652                         dev_name(&dimm->dev), location);
 653         }
 654
 655         return 0;
 656 }
 657
 658 /*
 659  * Memory controller device
 660  */
 661
 662 #define to_mci(k) container_of(k, struct mem_ctl_info, dev)
 663
 664 static ssize_t mci_reset_counters_store(struct device *dev,
 665                                         struct device_attribute *mattr,
 666                                         const char *data, size_t count)
 667 {
 668         struct mem_ctl_info *mci = to_mci(dev);
 669         int cnt, row, chan, i;
 670         mci->ue_mc = 0;
 671         mci->ce_mc = 0;
 672         mci->ue_noinfo_count = 0;
 673         mci->ce_noinfo_count = 0;
 674
 675         for (row = 0; row < mci->nr_csrows; row++) {
 676                 struct csrow_info *ri = mci->csrows[row];
 677
 678                 ri->ue_count = 0;
 679                 ri->ce_count = 0;
 680
 681                 for (chan = 0; chan < ri->nr_channels; chan++)
 682                         ri->channels[chan]->ce_count = 0;
 683         }
 684
 685         cnt = 1;
 686         for (i = 0; i < mci->n_layers; i++) {
 687                 cnt *= mci->layers[i].size;
 688                 memset(mci->ce_per_layer[i], 0, cnt * sizeof(u32));
 689                 memset(mci->ue_per_layer[i], 0, cnt * sizeof(u32));
 690         }
 691
 692         mci->start_time = jiffies;
 693         return count;
 694 }
 695
 696 /* Memory scrubbing interface:
 697  *
 698  * A MC driver can limit the scrubbing bandwidth based on the CPU type.
 699  * Therefore, ->set_sdram_scrub_rate should be made to return the actual
 700  * bandwidth that is accepted or 0 when scrubbing is to be disabled.
 701  *
 702  * Negative value still means that an error has occurred while setting
 703  * the scrub rate.
 704  */
 705 static ssize_t mci_sdram_scrub_rate_store(struct device *dev,
 706                                           struct device_attribute *mattr,
 707                                           const char *data, size_t count)
 708 {
 709         struct mem_ctl_info *mci = to_mci(dev);
 710         unsigned long bandwidth = 0;
 711         int new_bw = 0;
 712
 713         if (kstrtoul(data, 10, &bandwidth) < 0)
 714                 return -EINVAL;
 715
 716         new_bw = mci->set_sdram_scrub_rate(mci, bandwidth);
 717         if (new_bw < 0) {
 718                 edac_printk(KERN_WARNING, EDAC_MC,
 719                             "Error setting scrub rate to: %lu\n", bandwidth);
 720                 return -EINVAL;
 721         }
 722
 723         return count;
 724 }
 725
 726 /*
 727  * ->get_sdram_scrub_rate() return value semantics same as above.
 728  */
 729 static ssize_t mci_sdram_scrub_rate_show(struct device *dev,
 730                                          struct device_attribute *mattr,
 731                                          char *data)
 732 {
 733         struct mem_ctl_info *mci = to_mci(dev);
 734         int bandwidth = 0;
 735
 736         bandwidth = mci->get_sdram_scrub_rate(mci);
 737         if (bandwidth < 0) {
 738                 edac_printk(KERN_DEBUG, EDAC_MC, "Error reading scrub rate\n");
 739                 return bandwidth;
 740         }
 741
 742         return sprintf(data, "%d\n", bandwidth);
 743 }
 744
 745 /* default attribute files for the MCI object */
 746 static ssize_t mci_ue_count_show(struct device *dev,
 747                                  struct device_attribute *mattr,
 748                                  char *data)
 749 {
 750         struct mem_ctl_info *mci = to_mci(dev);
 751
 752         return sprintf(data, "%d\n", mci->ue_mc);
 753 }
 754
 755 static ssize_t mci_ce_count_show(struct device *dev,
 756                                  struct device_attribute *mattr,
 757                                  char *data)
 758 {
 759         struct mem_ctl_info *mci = to_mci(dev);
 760
 761         return sprintf(data, "%d\n", mci->ce_mc);
 762 }
 763
 764 static ssize_t mci_ce_noinfo_show(struct device *dev,
 765                                   struct device_attribute *mattr,
 766                                   char *data)
 767 {
 768         struct mem_ctl_info *mci = to_mci(dev);
 769
 770         return sprintf(data, "%d\n", mci->ce_noinfo_count);
 771 }
 772
 773 static ssize_t mci_ue_noinfo_show(struct device *dev,
 774                                   struct device_attribute *mattr,
 775                                   char *data)
 776 {
 777         struct mem_ctl_info *mci = to_mci(dev);
 778
 779         return sprintf(data, "%d\n", mci->ue_noinfo_count);
 780 }
 781
 782 static ssize_t mci_seconds_show(struct device *dev,
 783                                 struct device_attribute *mattr,
 784                                 char *data)
 785 {
 786         struct mem_ctl_info *mci = to_mci(dev);
 787
 788         return sprintf(data, "%ld\n", (jiffies - mci->start_time) / HZ);
 789 }
 790
 791 static ssize_t mci_ctl_name_show(struct device *dev,
 792                                  struct device_attribute *mattr,
 793                                  char *data)
 794 {
 795         struct mem_ctl_info *mci = to_mci(dev);
 796
 797         return sprintf(data, "%s\n", mci->ctl_name);
 798 }
 799
 800 static ssize_t mci_size_mb_show(struct device *dev,
 801                                 struct device_attribute *mattr,
 802                                 char *data)
 803 {
 804         struct mem_ctl_info *mci = to_mci(dev);
 805         int total_pages = 0, csrow_idx, j;
 806
 807         for (csrow_idx = 0; csrow_idx < mci->nr_csrows; csrow_idx++) {
 808                 struct csrow_info *csrow = mci->csrows[csrow_idx];
 809
 810                 for (j = 0; j < csrow->nr_channels; j++) {
 811                         struct dimm_info *dimm = csrow->channels[j]->dimm;
 812
 813                         total_pages += dimm->nr_pages;
 814                 }
 815         }
 816
 817         return sprintf(data, "%u\n", PAGES_TO_MiB(total_pages));
 818 }
 819
 820 static ssize_t mci_max_location_show(struct device *dev,
 821                                      struct device_attribute *mattr,
 822                                      char *data)
 823 {
 824         struct mem_ctl_info *mci = to_mci(dev);
 825         int i;
 826         char *p = data;
 827
 828         for (i = 0; i < mci->n_layers; i++) {
 829                 p += sprintf(p, "%s %d ",
 830                              edac_layer_name[mci->layers[i].type],
 831                              mci->layers[i].size - 1);
 832         }
 833
 834         return p - data;
 835 }
 836
 837 /* default Control file */
 838 static DEVICE_ATTR(reset_counters, S_IWUSR, NULL, mci_reset_counters_store);
 839
 840 /* default Attribute files */
 841 static DEVICE_ATTR(mc_name, S_IRUGO, mci_ctl_name_show, NULL);
 842 static DEVICE_ATTR(size_mb, S_IRUGO, mci_size_mb_show, NULL);
 843 static DEVICE_ATTR(seconds_since_reset, S_IRUGO, mci_seconds_show, NULL);
 844 static DEVICE_ATTR(ue_noinfo_count, S_IRUGO, mci_ue_noinfo_show, NULL);
 845 static DEVICE_ATTR(ce_noinfo_count, S_IRUGO, mci_ce_noinfo_show, NULL);
 846 static DEVICE_ATTR(ue_count, S_IRUGO, mci_ue_count_show, NULL);
 847 static DEVICE_ATTR(ce_count, S_IRUGO, mci_ce_count_show, NULL);
 848 static DEVICE_ATTR(max_location, S_IRUGO, mci_max_location_show, NULL);
 849
 850 /* memory scrubber attribute file */
 851 static DEVICE_ATTR(sdram_scrub_rate, 0, mci_sdram_scrub_rate_show,
 852             mci_sdram_scrub_rate_store); /* umode set later in is_visible */
 853
 854 static struct attribute *mci_attrs[] = {
 855         &dev_attr_reset_counters.attr,
 856         &dev_attr_mc_name.attr,
 857         &dev_attr_size_mb.attr,
 858         &dev_attr_seconds_since_reset.attr,
 859         &dev_attr_ue_noinfo_count.attr,
 860         &dev_attr_ce_noinfo_count.attr,
 861         &dev_attr_ue_count.attr,
 862         &dev_attr_ce_count.attr,
 863         &dev_attr_max_location.attr,
 864         &dev_attr_sdram_scrub_rate.attr,
 865         NULL
 866 };
 867
 868 static umode_t mci_attr_is_visible(struct kobject *kobj,
 869                                    struct attribute *attr, int idx)
 870 {
 871         struct device *dev = kobj_to_dev(kobj);
 872         struct mem_ctl_info *mci = to_mci(dev);
 873         umode_t mode = 0;
 874
 875         if (attr != &dev_attr_sdram_scrub_rate.attr)
 876                 return attr->mode;
 877         if (mci->get_sdram_scrub_rate)
 878                 mode |= S_IRUGO;
 879         if (mci->set_sdram_scrub_rate)
 880                 mode |= S_IWUSR;
 881         return mode;
 882 }
 883
 884 static const struct attribute_group mci_attr_grp = {
 885         .attrs  = mci_attrs,
 886         .is_visible = mci_attr_is_visible,
 887 };
 888
 889 static const struct attribute_group *mci_attr_groups[] = {
 890         &mci_attr_grp,
 891         NULL
 892 };
 893
 894 static void mci_attr_release(struct device *dev)
 895 {
 896         struct mem_ctl_info *mci = container_of(dev, struct mem_ctl_info, dev);
 897
 898         edac_dbg(1, "device %s released\n", dev_name(dev));
 899         kfree(mci);
 900 }
 901
 902 static const struct device_type mci_attr_type = {
 903         .groups         = mci_attr_groups,
 904         .release        = mci_attr_release,
 905 };
 906
 907 /*
 908  * Create a new Memory Controller kobject instance,
 909  *      mc<id> under the 'mc' directory
 910  *
 911  * Return:
 912  *      0       Success
 913  *      !0      Failure
 914  */
 915 int edac_create_sysfs_mci_device(struct mem_ctl_info *mci,
 916                                  const struct attribute_group **groups)
 917 {
 918         struct dimm_info *dimm;
 919         int err;
 920
 921         /* get the /sys/devices/system/edac subsys reference */
 922         mci->dev.type = &mci_attr_type;
 923         device_initialize(&mci->dev);
 924
 925         mci->dev.parent = mci_pdev;
 926         mci->dev.groups = groups;
 927         dev_set_name(&mci->dev, "mc%d", mci->mc_idx);
 928         dev_set_drvdata(&mci->dev, mci);
 929         pm_runtime_forbid(&mci->dev);
 930
 931         err = device_add(&mci->dev);
 932         if (err < 0) {
 933                 edac_dbg(1, "failure: create device %s\n", dev_name(&mci->dev));
 934                 put_device(&mci->dev);
 935                 return err;
 936         }
 937
 938         edac_dbg(0, "device %s created\n", dev_name(&mci->dev));
 939
 940         /*
 941          * Create the dimm/rank devices
 942          */
 943         mci_for_each_dimm(mci, dimm) {
 944                 /* Only expose populated DIMMs */
 945                 if (!dimm->nr_pages)
 946                         continue;
 947
 948                 err = edac_create_dimm_object(mci, dimm);
 949                 if (err)
 950                         goto fail_unregister_dimm;
 951         }
 952
 953 #ifdef CONFIG_EDAC_LEGACY_SYSFS
 954         err = edac_create_csrow_objects(mci);
 955         if (err < 0)
 956                 goto fail_unregister_dimm;
 957 #endif
 958
 959         edac_create_debugfs_nodes(mci);
 960         return 0;
 961
 962 fail_unregister_dimm:
 963         mci_for_each_dimm(mci, dimm) {
 964                 if (device_is_registered(&dimm->dev))
 965                         device_unregister(&dimm->dev);
 966         }
 967         device_unregister(&mci->dev);
 968
 969         return err;
 970 }
 971
 972 /*
 973  * remove a Memory Controller instance
 974  */
 975 void edac_remove_sysfs_mci_device(struct mem_ctl_info *mci)
 976 {
 977         struct dimm_info *dimm;
 978
 979         edac_dbg(0, "\n");
 980
 981 #ifdef CONFIG_EDAC_DEBUG
 982         edac_debugfs_remove_recursive(mci->debugfs);
 983 #endif
 984 #ifdef CONFIG_EDAC_LEGACY_SYSFS
 985         edac_delete_csrow_objects(mci);
 986 #endif
 987
 988         mci_for_each_dimm(mci, dimm) {
 989                 if (dimm->nr_pages == 0)
 990                         continue;
 991                 edac_dbg(1, "unregistering device %s\n", dev_name(&dimm->dev));
 992                 device_unregister(&dimm->dev);
 993         }
 994 }
 995
 996 void edac_unregister_sysfs(struct mem_ctl_info *mci)
 997 {
 998         edac_dbg(1, "unregistering device %s\n", dev_name(&mci->dev));
 999         device_unregister(&mci->dev);
1000 }
1001
1002 static void mc_attr_release(struct device *dev)
1003 {
1004         /*
1005          * There's no container structure here, as this is just the mci
1006          * parent device, used to create the /sys/devices/mc sysfs node.
1007          * So, there are no attributes on it.
1008          */
1009         edac_dbg(1, "device %s released\n", dev_name(dev));
1010         kfree(dev);
1011 }
1012
1013 static const struct device_type mc_attr_type = {
1014         .release        = mc_attr_release,
1015 };
1016 /*
1017  * Init/exit code for the module. Basically, creates/removes /sys/class/rc
1018  */
1019 int __init edac_mc_sysfs_init(void)
1020 {
1021         int err;
1022
1023         mci_pdev = kzalloc(sizeof(*mci_pdev), GFP_KERNEL);
1024         if (!mci_pdev)
1025                 return -ENOMEM;
1026
1027         mci_pdev->bus = edac_get_sysfs_subsys();
1028         mci_pdev->type = &mc_attr_type;
1029         device_initialize(mci_pdev);
1030         dev_set_name(mci_pdev, "mc");
1031
1032         err = device_add(mci_pdev);
1033         if (err < 0) {
1034                 edac_dbg(1, "failure: create device %s\n", dev_name(mci_pdev));
1035                 put_device(mci_pdev);
1036                 return err;
1037         }
1038
1039         edac_dbg(0, "device %s created\n", dev_name(mci_pdev));
1040
1041         return 0;
1042 }
1043
1044 void edac_mc_sysfs_exit(void)
1045 {
1046         device_unregister(mci_pdev);
1047 }