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 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 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 long l;
  56         int ret;
  57
  58         if (!val)
  59                 return -EINVAL;
  60
  61         ret = kstrtoul(val, 0, &l);
  62         if (ret)
  63                 return ret;
  64
  65         if (l < 1000)
  66                 return -EINVAL;
  67
  68         *((unsigned long *)kp->arg) = l;
  69
  70         /* notify edac_mc engine to reset the poll period */
  71         edac_mc_reset_delay_period(l);
  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_int,
  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         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 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 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 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, "Releasing csrow device %s\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         csrow->dev.type = &csrow_attr_type;
 408         csrow->dev.bus = mci->bus;
 409         csrow->dev.groups = csrow_dev_groups;
 410         device_initialize(&csrow->dev);
 411         csrow->dev.parent = &mci->dev;
 412         csrow->mci = mci;
 413         dev_set_name(&csrow->dev, "csrow%d", index);
 414         dev_set_drvdata(&csrow->dev, csrow);
 415
 416         edac_dbg(0, "creating (virtual) csrow node %s\n",
 417                  dev_name(&csrow->dev));
 418
 419         return device_add(&csrow->dev);
 420 }
 421
 422 /* Create a CSROW object under specifed edac_mc_device */
 423 static int edac_create_csrow_objects(struct mem_ctl_info *mci)
 424 {
 425         int err, i;
 426         struct csrow_info *csrow;
 427
 428         for (i = 0; i < mci->nr_csrows; i++) {
 429                 csrow = mci->csrows[i];
 430                 if (!nr_pages_per_csrow(csrow))
 431                         continue;
 432                 err = edac_create_csrow_object(mci, mci->csrows[i], i);
 433                 if (err < 0) {
 434                         edac_dbg(1,
 435                                  "failure: create csrow objects for csrow %d\n",
 436                                  i);
 437                         goto error;
 438                 }
 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                 put_device(&mci->csrows[i]->dev);
 448         }
 449
 450         return err;
 451 }
 452
 453 static void edac_delete_csrow_objects(struct mem_ctl_info *mci)
 454 {
 455         int i;
 456         struct csrow_info *csrow;
 457
 458         for (i = mci->nr_csrows - 1; i >= 0; i--) {
 459                 csrow = mci->csrows[i];
 460                 if (!nr_pages_per_csrow(csrow))
 461                         continue;
 462                 device_unregister(&mci->csrows[i]->dev);
 463         }
 464 }
 465 #endif
 466
 467 /*
 468  * Per-dimm (or per-rank) devices
 469  */
 470
 471 #define to_dimm(k) container_of(k, struct dimm_info, dev)
 472
 473 /* show/store functions for DIMM Label attributes */
 474 static ssize_t dimmdev_location_show(struct device *dev,
 475                                      struct device_attribute *mattr, char *data)
 476 {
 477         struct dimm_info *dimm = to_dimm(dev);
 478
 479         return edac_dimm_info_location(dimm, data, PAGE_SIZE);
 480 }
 481
 482 static ssize_t dimmdev_label_show(struct device *dev,
 483                                   struct device_attribute *mattr, char *data)
 484 {
 485         struct dimm_info *dimm = to_dimm(dev);
 486
 487         /* if field has not been initialized, there is nothing to send */
 488         if (!dimm->label[0])
 489                 return 0;
 490
 491         return snprintf(data, sizeof(dimm->label) + 1, "%s\n", dimm->label);
 492 }
 493
 494 static ssize_t dimmdev_label_store(struct device *dev,
 495                                    struct device_attribute *mattr,
 496                                    const char *data,
 497                                    size_t count)
 498 {
 499         struct dimm_info *dimm = to_dimm(dev);
 500         size_t copy_count = count;
 501
 502         if (count == 0)
 503                 return -EINVAL;
 504
 505         if (data[count - 1] == '\0' || data[count - 1] == '\n')
 506                 copy_count -= 1;
 507
 508         if (copy_count == 0 || copy_count >= sizeof(dimm->label))
 509                 return -EINVAL;
 510
 511         strncpy(dimm->label, data, copy_count);
 512         dimm->label[copy_count] = '\0';
 513
 514         return count;
 515 }
 516
 517 static ssize_t dimmdev_size_show(struct device *dev,
 518                                  struct device_attribute *mattr, char *data)
 519 {
 520         struct dimm_info *dimm = to_dimm(dev);
 521
 522         return sprintf(data, "%u\n", PAGES_TO_MiB(dimm->nr_pages));
 523 }
 524
 525 static ssize_t dimmdev_mem_type_show(struct device *dev,
 526                                      struct device_attribute *mattr, char *data)
 527 {
 528         struct dimm_info *dimm = to_dimm(dev);
 529
 530         return sprintf(data, "%s\n", edac_mem_types[dimm->mtype]);
 531 }
 532
 533 static ssize_t dimmdev_dev_type_show(struct device *dev,
 534                                      struct device_attribute *mattr, char *data)
 535 {
 536         struct dimm_info *dimm = to_dimm(dev);
 537
 538         return sprintf(data, "%s\n", dev_types[dimm->dtype]);
 539 }
 540
 541 static ssize_t dimmdev_edac_mode_show(struct device *dev,
 542                                       struct device_attribute *mattr,
 543                                       char *data)
 544 {
 545         struct dimm_info *dimm = to_dimm(dev);
 546
 547         return sprintf(data, "%s\n", edac_caps[dimm->edac_mode]);
 548 }
 549
 550 static ssize_t dimmdev_ce_count_show(struct device *dev,
 551                                       struct device_attribute *mattr,
 552                                       char *data)
 553 {
 554         struct dimm_info *dimm = to_dimm(dev);
 555         u32 count;
 556         int off;
 557
 558         off = EDAC_DIMM_OFF(dimm->mci->layers,
 559                             dimm->mci->n_layers,
 560                             dimm->location[0],
 561                             dimm->location[1],
 562                             dimm->location[2]);
 563         count = dimm->mci->ce_per_layer[dimm->mci->n_layers-1][off];
 564         return sprintf(data, "%u\n", count);
 565 }
 566
 567 static ssize_t dimmdev_ue_count_show(struct device *dev,
 568                                       struct device_attribute *mattr,
 569                                       char *data)
 570 {
 571         struct dimm_info *dimm = to_dimm(dev);
 572         u32 count;
 573         int off;
 574
 575         off = EDAC_DIMM_OFF(dimm->mci->layers,
 576                             dimm->mci->n_layers,
 577                             dimm->location[0],
 578                             dimm->location[1],
 579                             dimm->location[2]);
 580         count = dimm->mci->ue_per_layer[dimm->mci->n_layers-1][off];
 581         return sprintf(data, "%u\n", count);
 582 }
 583
 584 /* dimm/rank attribute files */
 585 static DEVICE_ATTR(dimm_label, S_IRUGO | S_IWUSR,
 586                    dimmdev_label_show, dimmdev_label_store);
 587 static DEVICE_ATTR(dimm_location, S_IRUGO, dimmdev_location_show, NULL);
 588 static DEVICE_ATTR(size, S_IRUGO, dimmdev_size_show, NULL);
 589 static DEVICE_ATTR(dimm_mem_type, S_IRUGO, dimmdev_mem_type_show, NULL);
 590 static DEVICE_ATTR(dimm_dev_type, S_IRUGO, dimmdev_dev_type_show, NULL);
 591 static DEVICE_ATTR(dimm_edac_mode, S_IRUGO, dimmdev_edac_mode_show, NULL);
 592 static DEVICE_ATTR(dimm_ce_count, S_IRUGO, dimmdev_ce_count_show, NULL);
 593 static DEVICE_ATTR(dimm_ue_count, S_IRUGO, dimmdev_ue_count_show, NULL);
 594
 595 /* attributes of the dimm<id>/rank<id> object */
 596 static struct attribute *dimm_attrs[] = {
 597         &dev_attr_dimm_label.attr,
 598         &dev_attr_dimm_location.attr,
 599         &dev_attr_size.attr,
 600         &dev_attr_dimm_mem_type.attr,
 601         &dev_attr_dimm_dev_type.attr,
 602         &dev_attr_dimm_edac_mode.attr,
 603         &dev_attr_dimm_ce_count.attr,
 604         &dev_attr_dimm_ue_count.attr,
 605         NULL,
 606 };
 607
 608 static const struct attribute_group dimm_attr_grp = {
 609         .attrs  = dimm_attrs,
 610 };
 611
 612 static const struct attribute_group *dimm_attr_groups[] = {
 613         &dimm_attr_grp,
 614         NULL
 615 };
 616
 617 static void dimm_attr_release(struct device *dev)
 618 {
 619         struct dimm_info *dimm = container_of(dev, struct dimm_info, dev);
 620
 621         edac_dbg(1, "Releasing dimm device %s\n", dev_name(dev));
 622         kfree(dimm);
 623 }
 624
 625 static const struct device_type dimm_attr_type = {
 626         .groups         = dimm_attr_groups,
 627         .release        = dimm_attr_release,
 628 };
 629
 630 /* Create a DIMM object under specifed memory controller device */
 631 static int edac_create_dimm_object(struct mem_ctl_info *mci,
 632                                    struct dimm_info *dimm,
 633                                    int index)
 634 {
 635         int err;
 636         dimm->mci = mci;
 637
 638         dimm->dev.type = &dimm_attr_type;
 639         dimm->dev.bus = mci->bus;
 640         device_initialize(&dimm->dev);
 641
 642         dimm->dev.parent = &mci->dev;
 643         if (mci->csbased)
 644                 dev_set_name(&dimm->dev, "rank%d", index);
 645         else
 646                 dev_set_name(&dimm->dev, "dimm%d", index);
 647         dev_set_drvdata(&dimm->dev, dimm);
 648         pm_runtime_forbid(&mci->dev);
 649
 650         err =  device_add(&dimm->dev);
 651
 652         edac_dbg(0, "creating rank/dimm device %s\n", dev_name(&dimm->dev));
 653
 654         return err;
 655 }
 656
 657 /*
 658  * Memory controller device
 659  */
 660
 661 #define to_mci(k) container_of(k, struct mem_ctl_info, dev)
 662
 663 static ssize_t mci_reset_counters_store(struct device *dev,
 664                                         struct device_attribute *mattr,
 665                                         const char *data, size_t count)
 666 {
 667         struct mem_ctl_info *mci = to_mci(dev);
 668         int cnt, row, chan, i;
 669         mci->ue_mc = 0;
 670         mci->ce_mc = 0;
 671         mci->ue_noinfo_count = 0;
 672         mci->ce_noinfo_count = 0;
 673
 674         for (row = 0; row < mci->nr_csrows; row++) {
 675                 struct csrow_info *ri = mci->csrows[row];
 676
 677                 ri->ue_count = 0;
 678                 ri->ce_count = 0;
 679
 680                 for (chan = 0; chan < ri->nr_channels; chan++)
 681                         ri->channels[chan]->ce_count = 0;
 682         }
 683
 684         cnt = 1;
 685         for (i = 0; i < mci->n_layers; i++) {
 686                 cnt *= mci->layers[i].size;
 687                 memset(mci->ce_per_layer[i], 0, cnt * sizeof(u32));
 688                 memset(mci->ue_per_layer[i], 0, cnt * sizeof(u32));
 689         }
 690
 691         mci->start_time = jiffies;
 692         return count;
 693 }
 694
 695 /* Memory scrubbing interface:
 696  *
 697  * A MC driver can limit the scrubbing bandwidth based on the CPU type.
 698  * Therefore, ->set_sdram_scrub_rate should be made to return the actual
 699  * bandwidth that is accepted or 0 when scrubbing is to be disabled.
 700  *
 701  * Negative value still means that an error has occurred while setting
 702  * the scrub rate.
 703  */
 704 static ssize_t mci_sdram_scrub_rate_store(struct device *dev,
 705                                           struct device_attribute *mattr,
 706                                           const char *data, size_t count)
 707 {
 708         struct mem_ctl_info *mci = to_mci(dev);
 709         unsigned long bandwidth = 0;
 710         int new_bw = 0;
 711
 712         if (kstrtoul(data, 10, &bandwidth) < 0)
 713                 return -EINVAL;
 714
 715         new_bw = mci->set_sdram_scrub_rate(mci, bandwidth);
 716         if (new_bw < 0) {
 717                 edac_printk(KERN_WARNING, EDAC_MC,
 718                             "Error setting scrub rate to: %lu\n", bandwidth);
 719                 return -EINVAL;
 720         }
 721
 722         return count;
 723 }
 724
 725 /*
 726  * ->get_sdram_scrub_rate() return value semantics same as above.
 727  */
 728 static ssize_t mci_sdram_scrub_rate_show(struct device *dev,
 729                                          struct device_attribute *mattr,
 730                                          char *data)
 731 {
 732         struct mem_ctl_info *mci = to_mci(dev);
 733         int bandwidth = 0;
 734
 735         bandwidth = mci->get_sdram_scrub_rate(mci);
 736         if (bandwidth < 0) {
 737                 edac_printk(KERN_DEBUG, EDAC_MC, "Error reading scrub rate\n");
 738                 return bandwidth;
 739         }
 740
 741         return sprintf(data, "%d\n", bandwidth);
 742 }
 743
 744 /* default attribute files for the MCI object */
 745 static ssize_t mci_ue_count_show(struct device *dev,
 746                                  struct device_attribute *mattr,
 747                                  char *data)
 748 {
 749         struct mem_ctl_info *mci = to_mci(dev);
 750
 751         return sprintf(data, "%d\n", mci->ue_mc);
 752 }
 753
 754 static ssize_t mci_ce_count_show(struct device *dev,
 755                                  struct device_attribute *mattr,
 756                                  char *data)
 757 {
 758         struct mem_ctl_info *mci = to_mci(dev);
 759
 760         return sprintf(data, "%d\n", mci->ce_mc);
 761 }
 762
 763 static ssize_t mci_ce_noinfo_show(struct device *dev,
 764                                   struct device_attribute *mattr,
 765                                   char *data)
 766 {
 767         struct mem_ctl_info *mci = to_mci(dev);
 768
 769         return sprintf(data, "%d\n", mci->ce_noinfo_count);
 770 }
 771
 772 static ssize_t mci_ue_noinfo_show(struct device *dev,
 773                                   struct device_attribute *mattr,
 774                                   char *data)
 775 {
 776         struct mem_ctl_info *mci = to_mci(dev);
 777
 778         return sprintf(data, "%d\n", mci->ue_noinfo_count);
 779 }
 780
 781 static ssize_t mci_seconds_show(struct device *dev,
 782                                 struct device_attribute *mattr,
 783                                 char *data)
 784 {
 785         struct mem_ctl_info *mci = to_mci(dev);
 786
 787         return sprintf(data, "%ld\n", (jiffies - mci->start_time) / HZ);
 788 }
 789
 790 static ssize_t mci_ctl_name_show(struct device *dev,
 791                                  struct device_attribute *mattr,
 792                                  char *data)
 793 {
 794         struct mem_ctl_info *mci = to_mci(dev);
 795
 796         return sprintf(data, "%s\n", mci->ctl_name);
 797 }
 798
 799 static ssize_t mci_size_mb_show(struct device *dev,
 800                                 struct device_attribute *mattr,
 801                                 char *data)
 802 {
 803         struct mem_ctl_info *mci = to_mci(dev);
 804         int total_pages = 0, csrow_idx, j;
 805
 806         for (csrow_idx = 0; csrow_idx < mci->nr_csrows; csrow_idx++) {
 807                 struct csrow_info *csrow = mci->csrows[csrow_idx];
 808
 809                 for (j = 0; j < csrow->nr_channels; j++) {
 810                         struct dimm_info *dimm = csrow->channels[j]->dimm;
 811
 812                         total_pages += dimm->nr_pages;
 813                 }
 814         }
 815
 816         return sprintf(data, "%u\n", PAGES_TO_MiB(total_pages));
 817 }
 818
 819 static ssize_t mci_max_location_show(struct device *dev,
 820                                      struct device_attribute *mattr,
 821                                      char *data)
 822 {
 823         struct mem_ctl_info *mci = to_mci(dev);
 824         int i;
 825         char *p = data;
 826
 827         for (i = 0; i < mci->n_layers; i++) {
 828                 p += sprintf(p, "%s %d ",
 829                              edac_layer_name[mci->layers[i].type],
 830                              mci->layers[i].size - 1);
 831         }
 832
 833         return p - data;
 834 }
 835
 836 /* default Control file */
 837 static DEVICE_ATTR(reset_counters, S_IWUSR, NULL, mci_reset_counters_store);
 838
 839 /* default Attribute files */
 840 static DEVICE_ATTR(mc_name, S_IRUGO, mci_ctl_name_show, NULL);
 841 static DEVICE_ATTR(size_mb, S_IRUGO, mci_size_mb_show, NULL);
 842 static DEVICE_ATTR(seconds_since_reset, S_IRUGO, mci_seconds_show, NULL);
 843 static DEVICE_ATTR(ue_noinfo_count, S_IRUGO, mci_ue_noinfo_show, NULL);
 844 static DEVICE_ATTR(ce_noinfo_count, S_IRUGO, mci_ce_noinfo_show, NULL);
 845 static DEVICE_ATTR(ue_count, S_IRUGO, mci_ue_count_show, NULL);
 846 static DEVICE_ATTR(ce_count, S_IRUGO, mci_ce_count_show, NULL);
 847 static DEVICE_ATTR(max_location, S_IRUGO, mci_max_location_show, NULL);
 848
 849 /* memory scrubber attribute file */
 850 static DEVICE_ATTR(sdram_scrub_rate, 0, mci_sdram_scrub_rate_show,
 851             mci_sdram_scrub_rate_store); /* umode set later in is_visible */
 852
 853 static struct attribute *mci_attrs[] = {
 854         &dev_attr_reset_counters.attr,
 855         &dev_attr_mc_name.attr,
 856         &dev_attr_size_mb.attr,
 857         &dev_attr_seconds_since_reset.attr,
 858         &dev_attr_ue_noinfo_count.attr,
 859         &dev_attr_ce_noinfo_count.attr,
 860         &dev_attr_ue_count.attr,
 861         &dev_attr_ce_count.attr,
 862         &dev_attr_max_location.attr,
 863         &dev_attr_sdram_scrub_rate.attr,
 864         NULL
 865 };
 866
 867 static umode_t mci_attr_is_visible(struct kobject *kobj,
 868                                    struct attribute *attr, int idx)
 869 {
 870         struct device *dev = kobj_to_dev(kobj);
 871         struct mem_ctl_info *mci = to_mci(dev);
 872         umode_t mode = 0;
 873
 874         if (attr != &dev_attr_sdram_scrub_rate.attr)
 875                 return attr->mode;
 876         if (mci->get_sdram_scrub_rate)
 877                 mode |= S_IRUGO;
 878         if (mci->set_sdram_scrub_rate)
 879                 mode |= S_IWUSR;
 880         return mode;
 881 }
 882
 883 static const struct attribute_group mci_attr_grp = {
 884         .attrs  = mci_attrs,
 885         .is_visible = mci_attr_is_visible,
 886 };
 887
 888 static const struct attribute_group *mci_attr_groups[] = {
 889         &mci_attr_grp,
 890         NULL
 891 };
 892
 893 static void mci_attr_release(struct device *dev)
 894 {
 895         struct mem_ctl_info *mci = container_of(dev, struct mem_ctl_info, dev);
 896
 897         edac_dbg(1, "Releasing csrow device %s\n", dev_name(dev));
 898         kfree(mci);
 899 }
 900
 901 static const struct device_type mci_attr_type = {
 902         .groups         = mci_attr_groups,
 903         .release        = mci_attr_release,
 904 };
 905
 906 /*
 907  * Create a new Memory Controller kobject instance,
 908  *      mc<id> under the 'mc' directory
 909  *
 910  * Return:
 911  *      0       Success
 912  *      !0      Failure
 913  */
 914 int edac_create_sysfs_mci_device(struct mem_ctl_info *mci,
 915                                  const struct attribute_group **groups)
 916 {
 917         char *name;
 918         int i, err;
 919
 920         /*
 921          * The memory controller needs its own bus, in order to avoid
 922          * namespace conflicts at /sys/bus/edac.
 923          */
 924         name = kasprintf(GFP_KERNEL, "mc%d", mci->mc_idx);
 925         if (!name)
 926                 return -ENOMEM;
 927
 928         mci->bus->name = name;
 929
 930         edac_dbg(0, "creating bus %s\n", mci->bus->name);
 931
 932         err = bus_register(mci->bus);
 933         if (err < 0) {
 934                 kfree(name);
 935                 return err;
 936         }
 937
 938         /* get the /sys/devices/system/edac subsys reference */
 939         mci->dev.type = &mci_attr_type;
 940         device_initialize(&mci->dev);
 941
 942         mci->dev.parent = mci_pdev;
 943         mci->dev.bus = mci->bus;
 944         mci->dev.groups = groups;
 945         dev_set_name(&mci->dev, "mc%d", mci->mc_idx);
 946         dev_set_drvdata(&mci->dev, mci);
 947         pm_runtime_forbid(&mci->dev);
 948
 949         edac_dbg(0, "creating device %s\n", dev_name(&mci->dev));
 950         err = device_add(&mci->dev);
 951         if (err < 0) {
 952                 edac_dbg(1, "failure: create device %s\n", dev_name(&mci->dev));
 953                 goto fail_unregister_bus;
 954         }
 955
 956         /*
 957          * Create the dimm/rank devices
 958          */
 959         for (i = 0; i < mci->tot_dimms; i++) {
 960                 struct dimm_info *dimm = mci->dimms[i];
 961                 /* Only expose populated DIMMs */
 962                 if (!dimm->nr_pages)
 963                         continue;
 964
 965 #ifdef CONFIG_EDAC_DEBUG
 966                 edac_dbg(1, "creating dimm%d, located at ", i);
 967                 if (edac_debug_level >= 1) {
 968                         int lay;
 969                         for (lay = 0; lay < mci->n_layers; lay++)
 970                                 printk(KERN_CONT "%s %d ",
 971                                         edac_layer_name[mci->layers[lay].type],
 972                                         dimm->location[lay]);
 973                         printk(KERN_CONT "\n");
 974                 }
 975 #endif
 976                 err = edac_create_dimm_object(mci, dimm, i);
 977                 if (err) {
 978                         edac_dbg(1, "failure: create dimm %d obj\n", i);
 979                         goto fail_unregister_dimm;
 980                 }
 981         }
 982
 983 #ifdef CONFIG_EDAC_LEGACY_SYSFS
 984         err = edac_create_csrow_objects(mci);
 985         if (err < 0)
 986                 goto fail_unregister_dimm;
 987 #endif
 988
 989         edac_create_debugfs_nodes(mci);
 990         return 0;
 991
 992 fail_unregister_dimm:
 993         for (i--; i >= 0; i--) {
 994                 struct dimm_info *dimm = mci->dimms[i];
 995                 if (!dimm->nr_pages)
 996                         continue;
 997
 998                 device_unregister(&dimm->dev);
 999         }
1000         device_unregister(&mci->dev);
1001 fail_unregister_bus:
1002         bus_unregister(mci->bus);
1003         kfree(name);
1004
1005         return err;
1006 }
1007
1008 /*
1009  * remove a Memory Controller instance
1010  */
1011 void edac_remove_sysfs_mci_device(struct mem_ctl_info *mci)
1012 {
1013         int i;
1014
1015         edac_dbg(0, "\n");
1016
1017 #ifdef CONFIG_EDAC_DEBUG
1018         edac_debugfs_remove_recursive(mci->debugfs);
1019 #endif
1020 #ifdef CONFIG_EDAC_LEGACY_SYSFS
1021         edac_delete_csrow_objects(mci);
1022 #endif
1023
1024         for (i = 0; i < mci->tot_dimms; i++) {
1025                 struct dimm_info *dimm = mci->dimms[i];
1026                 if (dimm->nr_pages == 0)
1027                         continue;
1028                 edac_dbg(0, "removing device %s\n", dev_name(&dimm->dev));
1029                 device_unregister(&dimm->dev);
1030         }
1031 }
1032
1033 void edac_unregister_sysfs(struct mem_ctl_info *mci)
1034 {
1035         struct bus_type *bus = mci->bus;
1036         const char *name = mci->bus->name;
1037
1038         edac_dbg(1, "Unregistering device %s\n", dev_name(&mci->dev));
1039         device_unregister(&mci->dev);
1040         bus_unregister(bus);
1041         kfree(name);
1042 }
1043
1044 static void mc_attr_release(struct device *dev)
1045 {
1046         /*
1047          * There's no container structure here, as this is just the mci
1048          * parent device, used to create the /sys/devices/mc sysfs node.
1049          * So, there are no attributes on it.
1050          */
1051         edac_dbg(1, "Releasing device %s\n", dev_name(dev));
1052         kfree(dev);
1053 }
1054
1055 static const struct device_type mc_attr_type = {
1056         .release        = mc_attr_release,
1057 };
1058 /*
1059  * Init/exit code for the module. Basically, creates/removes /sys/class/rc
1060  */
1061 int __init edac_mc_sysfs_init(void)
1062 {
1063         int err;
1064
1065         mci_pdev = kzalloc(sizeof(*mci_pdev), GFP_KERNEL);
1066         if (!mci_pdev) {
1067                 err = -ENOMEM;
1068                 goto out;
1069         }
1070
1071         mci_pdev->bus = edac_get_sysfs_subsys();
1072         mci_pdev->type = &mc_attr_type;
1073         device_initialize(mci_pdev);
1074         dev_set_name(mci_pdev, "mc");
1075
1076         err = device_add(mci_pdev);
1077         if (err < 0)
1078                 goto out_put_device;
1079
1080         edac_dbg(0, "device %s created\n", dev_name(mci_pdev));
1081
1082         return 0;
1083
1084  out_put_device:
1085         put_device(mci_pdev);
1086  out:
1087         return err;
1088 }
1089
1090 void edac_mc_sysfs_exit(void)
1091 {
1092         device_unregister(mci_pdev);
1093 }