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, 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 mem_types[] = {
  95         [MEM_EMPTY] = "Empty",
  96         [MEM_RESERVED] = "Reserved",
  97         [MEM_UNKNOWN] = "Unknown",
  98         [MEM_FPM] = "FPM",
  99         [MEM_EDO] = "EDO",
 100         [MEM_BEDO] = "BEDO",
 101         [MEM_SDR] = "Unbuffered-SDR",
 102         [MEM_RDR] = "Registered-SDR",
 103         [MEM_DDR] = "Unbuffered-DDR",
 104         [MEM_RDDR] = "Registered-DDR",
 105         [MEM_RMBS] = "RMBS",
 106         [MEM_DDR2] = "Unbuffered-DDR2",
 107         [MEM_FB_DDR2] = "FullyBuffered-DDR2",
 108         [MEM_RDDR2] = "Registered-DDR2",
 109         [MEM_XDR] = "XDR",
 110         [MEM_DDR3] = "Unbuffered-DDR3",
 111         [MEM_RDDR3] = "Registered-DDR3",
 112         [MEM_DDR4] = "Unbuffered-DDR4",
 113         [MEM_RDDR4] = "Registered-DDR4"
 114 };
 115
 116 static const char * const dev_types[] = {
 117         [DEV_UNKNOWN] = "Unknown",
 118         [DEV_X1] = "x1",
 119         [DEV_X2] = "x2",
 120         [DEV_X4] = "x4",
 121         [DEV_X8] = "x8",
 122         [DEV_X16] = "x16",
 123         [DEV_X32] = "x32",
 124         [DEV_X64] = "x64"
 125 };
 126
 127 static const char * const edac_caps[] = {
 128         [EDAC_UNKNOWN] = "Unknown",
 129         [EDAC_NONE] = "None",
 130         [EDAC_RESERVED] = "Reserved",
 131         [EDAC_PARITY] = "PARITY",
 132         [EDAC_EC] = "EC",
 133         [EDAC_SECDED] = "SECDED",
 134         [EDAC_S2ECD2ED] = "S2ECD2ED",
 135         [EDAC_S4ECD4ED] = "S4ECD4ED",
 136         [EDAC_S8ECD8ED] = "S8ECD8ED",
 137         [EDAC_S16ECD16ED] = "S16ECD16ED"
 138 };
 139
 140 #ifdef CONFIG_EDAC_LEGACY_SYSFS
 141 /*
 142  * EDAC sysfs CSROW data structures and methods
 143  */
 144
 145 #define to_csrow(k) container_of(k, struct csrow_info, dev)
 146
 147 /*
 148  * We need it to avoid namespace conflicts between the legacy API
 149  * and the per-dimm/per-rank one
 150  */
 151 #define DEVICE_ATTR_LEGACY(_name, _mode, _show, _store) \
 152         static struct device_attribute dev_attr_legacy_##_name = __ATTR(_name, _mode, _show, _store)
 153
 154 struct dev_ch_attribute {
 155         struct device_attribute attr;
 156         int channel;
 157 };
 158
 159 #define DEVICE_CHANNEL(_name, _mode, _show, _store, _var) \
 160         static struct dev_ch_attribute dev_attr_legacy_##_name = \
 161                 { __ATTR(_name, _mode, _show, _store), (_var) }
 162
 163 #define to_channel(k) (container_of(k, struct dev_ch_attribute, attr)->channel)
 164
 165 /* Set of more default csrow<id> attribute show/store functions */
 166 static ssize_t csrow_ue_count_show(struct device *dev,
 167                                    struct device_attribute *mattr, char *data)
 168 {
 169         struct csrow_info *csrow = to_csrow(dev);
 170
 171         return sprintf(data, "%u\n", csrow->ue_count);
 172 }
 173
 174 static ssize_t csrow_ce_count_show(struct device *dev,
 175                                    struct device_attribute *mattr, char *data)
 176 {
 177         struct csrow_info *csrow = to_csrow(dev);
 178
 179         return sprintf(data, "%u\n", csrow->ce_count);
 180 }
 181
 182 static ssize_t csrow_size_show(struct device *dev,
 183                                struct device_attribute *mattr, char *data)
 184 {
 185         struct csrow_info *csrow = to_csrow(dev);
 186         int i;
 187         u32 nr_pages = 0;
 188
 189         for (i = 0; i < csrow->nr_channels; i++)
 190                 nr_pages += csrow->channels[i]->dimm->nr_pages;
 191         return sprintf(data, "%u\n", PAGES_TO_MiB(nr_pages));
 192 }
 193
 194 static ssize_t csrow_mem_type_show(struct device *dev,
 195                                    struct device_attribute *mattr, char *data)
 196 {
 197         struct csrow_info *csrow = to_csrow(dev);
 198
 199         return sprintf(data, "%s\n", mem_types[csrow->channels[0]->dimm->mtype]);
 200 }
 201
 202 static ssize_t csrow_dev_type_show(struct device *dev,
 203                                    struct device_attribute *mattr, char *data)
 204 {
 205         struct csrow_info *csrow = to_csrow(dev);
 206
 207         return sprintf(data, "%s\n", dev_types[csrow->channels[0]->dimm->dtype]);
 208 }
 209
 210 static ssize_t csrow_edac_mode_show(struct device *dev,
 211                                     struct device_attribute *mattr,
 212                                     char *data)
 213 {
 214         struct csrow_info *csrow = to_csrow(dev);
 215
 216         return sprintf(data, "%s\n", edac_caps[csrow->channels[0]->dimm->edac_mode]);
 217 }
 218
 219 /* show/store functions for DIMM Label attributes */
 220 static ssize_t channel_dimm_label_show(struct device *dev,
 221                                        struct device_attribute *mattr,
 222                                        char *data)
 223 {
 224         struct csrow_info *csrow = to_csrow(dev);
 225         unsigned chan = to_channel(mattr);
 226         struct rank_info *rank = csrow->channels[chan];
 227
 228         /* if field has not been initialized, there is nothing to send */
 229         if (!rank->dimm->label[0])
 230                 return 0;
 231
 232         return snprintf(data, sizeof(rank->dimm->label) + 1, "%s\n",
 233                         rank->dimm->label);
 234 }
 235
 236 static ssize_t channel_dimm_label_store(struct device *dev,
 237                                         struct device_attribute *mattr,
 238                                         const char *data, size_t count)
 239 {
 240         struct csrow_info *csrow = to_csrow(dev);
 241         unsigned chan = to_channel(mattr);
 242         struct rank_info *rank = csrow->channels[chan];
 243         size_t copy_count = count;
 244
 245         if (count == 0)
 246                 return -EINVAL;
 247
 248         if (data[count - 1] == '\0' || data[count - 1] == '\n')
 249                 copy_count -= 1;
 250
 251         if (copy_count == 0 || copy_count >= sizeof(rank->dimm->label))
 252                 return -EINVAL;
 253
 254         strncpy(rank->dimm->label, data, copy_count);
 255         rank->dimm->label[copy_count] = '\0';
 256
 257         return count;
 258 }
 259
 260 /* show function for dynamic chX_ce_count attribute */
 261 static ssize_t channel_ce_count_show(struct device *dev,
 262                                      struct device_attribute *mattr, char *data)
 263 {
 264         struct csrow_info *csrow = to_csrow(dev);
 265         unsigned chan = to_channel(mattr);
 266         struct rank_info *rank = csrow->channels[chan];
 267
 268         return sprintf(data, "%u\n", rank->ce_count);
 269 }
 270
 271 /* cwrow<id>/attribute files */
 272 DEVICE_ATTR_LEGACY(size_mb, S_IRUGO, csrow_size_show, NULL);
 273 DEVICE_ATTR_LEGACY(dev_type, S_IRUGO, csrow_dev_type_show, NULL);
 274 DEVICE_ATTR_LEGACY(mem_type, S_IRUGO, csrow_mem_type_show, NULL);
 275 DEVICE_ATTR_LEGACY(edac_mode, S_IRUGO, csrow_edac_mode_show, NULL);
 276 DEVICE_ATTR_LEGACY(ue_count, S_IRUGO, csrow_ue_count_show, NULL);
 277 DEVICE_ATTR_LEGACY(ce_count, S_IRUGO, csrow_ce_count_show, NULL);
 278
 279 /* default attributes of the CSROW<id> object */
 280 static struct attribute *csrow_attrs[] = {
 281         &dev_attr_legacy_dev_type.attr,
 282         &dev_attr_legacy_mem_type.attr,
 283         &dev_attr_legacy_edac_mode.attr,
 284         &dev_attr_legacy_size_mb.attr,
 285         &dev_attr_legacy_ue_count.attr,
 286         &dev_attr_legacy_ce_count.attr,
 287         NULL,
 288 };
 289
 290 static const struct attribute_group csrow_attr_grp = {
 291         .attrs  = csrow_attrs,
 292 };
 293
 294 static const struct attribute_group *csrow_attr_groups[] = {
 295         &csrow_attr_grp,
 296         NULL
 297 };
 298
 299 static void csrow_attr_release(struct device *dev)
 300 {
 301         struct csrow_info *csrow = container_of(dev, struct csrow_info, dev);
 302
 303         edac_dbg(1, "Releasing csrow device %s\n", dev_name(dev));
 304         kfree(csrow);
 305 }
 306
 307 static const struct device_type csrow_attr_type = {
 308         .groups         = csrow_attr_groups,
 309         .release        = csrow_attr_release,
 310 };
 311
 312 /*
 313  * possible dynamic channel DIMM Label attribute files
 314  *
 315  */
 316 DEVICE_CHANNEL(ch0_dimm_label, S_IRUGO | S_IWUSR,
 317         channel_dimm_label_show, channel_dimm_label_store, 0);
 318 DEVICE_CHANNEL(ch1_dimm_label, S_IRUGO | S_IWUSR,
 319         channel_dimm_label_show, channel_dimm_label_store, 1);
 320 DEVICE_CHANNEL(ch2_dimm_label, S_IRUGO | S_IWUSR,
 321         channel_dimm_label_show, channel_dimm_label_store, 2);
 322 DEVICE_CHANNEL(ch3_dimm_label, S_IRUGO | S_IWUSR,
 323         channel_dimm_label_show, channel_dimm_label_store, 3);
 324 DEVICE_CHANNEL(ch4_dimm_label, S_IRUGO | S_IWUSR,
 325         channel_dimm_label_show, channel_dimm_label_store, 4);
 326 DEVICE_CHANNEL(ch5_dimm_label, S_IRUGO | S_IWUSR,
 327         channel_dimm_label_show, channel_dimm_label_store, 5);
 328 DEVICE_CHANNEL(ch6_dimm_label, S_IRUGO | S_IWUSR,
 329         channel_dimm_label_show, channel_dimm_label_store, 6);
 330 DEVICE_CHANNEL(ch7_dimm_label, S_IRUGO | S_IWUSR,
 331         channel_dimm_label_show, channel_dimm_label_store, 7);
 332
 333 /* Total possible dynamic DIMM Label attribute file table */
 334 static struct attribute *dynamic_csrow_dimm_attr[] = {
 335         &dev_attr_legacy_ch0_dimm_label.attr.attr,
 336         &dev_attr_legacy_ch1_dimm_label.attr.attr,
 337         &dev_attr_legacy_ch2_dimm_label.attr.attr,
 338         &dev_attr_legacy_ch3_dimm_label.attr.attr,
 339         &dev_attr_legacy_ch4_dimm_label.attr.attr,
 340         &dev_attr_legacy_ch5_dimm_label.attr.attr,
 341         &dev_attr_legacy_ch6_dimm_label.attr.attr,
 342         &dev_attr_legacy_ch7_dimm_label.attr.attr,
 343         NULL
 344 };
 345
 346 /* possible dynamic channel ce_count attribute files */
 347 DEVICE_CHANNEL(ch0_ce_count, S_IRUGO,
 348                    channel_ce_count_show, NULL, 0);
 349 DEVICE_CHANNEL(ch1_ce_count, S_IRUGO,
 350                    channel_ce_count_show, NULL, 1);
 351 DEVICE_CHANNEL(ch2_ce_count, S_IRUGO,
 352                    channel_ce_count_show, NULL, 2);
 353 DEVICE_CHANNEL(ch3_ce_count, S_IRUGO,
 354                    channel_ce_count_show, NULL, 3);
 355 DEVICE_CHANNEL(ch4_ce_count, S_IRUGO,
 356                    channel_ce_count_show, NULL, 4);
 357 DEVICE_CHANNEL(ch5_ce_count, S_IRUGO,
 358                    channel_ce_count_show, NULL, 5);
 359 DEVICE_CHANNEL(ch6_ce_count, S_IRUGO,
 360                    channel_ce_count_show, NULL, 6);
 361 DEVICE_CHANNEL(ch7_ce_count, S_IRUGO,
 362                    channel_ce_count_show, NULL, 7);
 363
 364 /* Total possible dynamic ce_count attribute file table */
 365 static struct attribute *dynamic_csrow_ce_count_attr[] = {
 366         &dev_attr_legacy_ch0_ce_count.attr.attr,
 367         &dev_attr_legacy_ch1_ce_count.attr.attr,
 368         &dev_attr_legacy_ch2_ce_count.attr.attr,
 369         &dev_attr_legacy_ch3_ce_count.attr.attr,
 370         &dev_attr_legacy_ch4_ce_count.attr.attr,
 371         &dev_attr_legacy_ch5_ce_count.attr.attr,
 372         &dev_attr_legacy_ch6_ce_count.attr.attr,
 373         &dev_attr_legacy_ch7_ce_count.attr.attr,
 374         NULL
 375 };
 376
 377 static umode_t csrow_dev_is_visible(struct kobject *kobj,
 378                                     struct attribute *attr, int idx)
 379 {
 380         struct device *dev = kobj_to_dev(kobj);
 381         struct csrow_info *csrow = container_of(dev, struct csrow_info, dev);
 382
 383         if (idx >= csrow->nr_channels)
 384                 return 0;
 385
 386         if (idx >= ARRAY_SIZE(dynamic_csrow_ce_count_attr) - 1) {
 387                 WARN_ONCE(1, "idx: %d\n", idx);
 388                 return 0;
 389         }
 390
 391         /* Only expose populated DIMMs */
 392         if (!csrow->channels[idx]->dimm->nr_pages)
 393                 return 0;
 394
 395         return attr->mode;
 396 }
 397
 398
 399 static const struct attribute_group csrow_dev_dimm_group = {
 400         .attrs = dynamic_csrow_dimm_attr,
 401         .is_visible = csrow_dev_is_visible,
 402 };
 403
 404 static const struct attribute_group csrow_dev_ce_count_group = {
 405         .attrs = dynamic_csrow_ce_count_attr,
 406         .is_visible = csrow_dev_is_visible,
 407 };
 408
 409 static const struct attribute_group *csrow_dev_groups[] = {
 410         &csrow_dev_dimm_group,
 411         &csrow_dev_ce_count_group,
 412         NULL
 413 };
 414
 415 static inline int nr_pages_per_csrow(struct csrow_info *csrow)
 416 {
 417         int chan, nr_pages = 0;
 418
 419         for (chan = 0; chan < csrow->nr_channels; chan++)
 420                 nr_pages += csrow->channels[chan]->dimm->nr_pages;
 421
 422         return nr_pages;
 423 }
 424
 425 /* Create a CSROW object under specifed edac_mc_device */
 426 static int edac_create_csrow_object(struct mem_ctl_info *mci,
 427                                     struct csrow_info *csrow, int index)
 428 {
 429         int err;
 430
 431         csrow->dev.type = &csrow_attr_type;
 432         csrow->dev.bus = mci->bus;
 433         csrow->dev.groups = csrow_dev_groups;
 434         device_initialize(&csrow->dev);
 435         csrow->dev.parent = &mci->dev;
 436         csrow->mci = mci;
 437         dev_set_name(&csrow->dev, "csrow%d", index);
 438         dev_set_drvdata(&csrow->dev, csrow);
 439
 440         edac_dbg(0, "creating (virtual) csrow node %s\n",
 441                  dev_name(&csrow->dev));
 442
 443         err = device_add(&csrow->dev);
 444         if (err)
 445                 put_device(&csrow->dev);
 446
 447         return err;
 448 }
 449
 450 /* Create a CSROW object under specifed edac_mc_device */
 451 static int edac_create_csrow_objects(struct mem_ctl_info *mci)
 452 {
 453         int err, i;
 454         struct csrow_info *csrow;
 455
 456         for (i = 0; i < mci->nr_csrows; i++) {
 457                 csrow = mci->csrows[i];
 458                 if (!nr_pages_per_csrow(csrow))
 459                         continue;
 460                 err = edac_create_csrow_object(mci, mci->csrows[i], i);
 461                 if (err < 0) {
 462                         edac_dbg(1,
 463                                  "failure: create csrow objects for csrow %d\n",
 464                                  i);
 465                         goto error;
 466                 }
 467         }
 468         return 0;
 469
 470 error:
 471         for (--i; i >= 0; i--) {
 472                 csrow = mci->csrows[i];
 473                 if (!nr_pages_per_csrow(csrow))
 474                         continue;
 475                 put_device(&mci->csrows[i]->dev);
 476         }
 477
 478         return err;
 479 }
 480
 481 static void edac_delete_csrow_objects(struct mem_ctl_info *mci)
 482 {
 483         int i;
 484         struct csrow_info *csrow;
 485
 486         for (i = mci->nr_csrows - 1; i >= 0; i--) {
 487                 csrow = mci->csrows[i];
 488                 if (!nr_pages_per_csrow(csrow))
 489                         continue;
 490                 device_unregister(&mci->csrows[i]->dev);
 491         }
 492 }
 493 #endif
 494
 495 /*
 496  * Per-dimm (or per-rank) devices
 497  */
 498
 499 #define to_dimm(k) container_of(k, struct dimm_info, dev)
 500
 501 /* show/store functions for DIMM Label attributes */
 502 static ssize_t dimmdev_location_show(struct device *dev,
 503                                      struct device_attribute *mattr, char *data)
 504 {
 505         struct dimm_info *dimm = to_dimm(dev);
 506
 507         return edac_dimm_info_location(dimm, data, PAGE_SIZE);
 508 }
 509
 510 static ssize_t dimmdev_label_show(struct device *dev,
 511                                   struct device_attribute *mattr, char *data)
 512 {
 513         struct dimm_info *dimm = to_dimm(dev);
 514
 515         /* if field has not been initialized, there is nothing to send */
 516         if (!dimm->label[0])
 517                 return 0;
 518
 519         return snprintf(data, sizeof(dimm->label) + 1, "%s\n", dimm->label);
 520 }
 521
 522 static ssize_t dimmdev_label_store(struct device *dev,
 523                                    struct device_attribute *mattr,
 524                                    const char *data,
 525                                    size_t count)
 526 {
 527         struct dimm_info *dimm = to_dimm(dev);
 528         size_t copy_count = count;
 529
 530         if (count == 0)
 531                 return -EINVAL;
 532
 533         if (data[count - 1] == '\0' || data[count - 1] == '\n')
 534                 copy_count -= 1;
 535
 536         if (copy_count == 0 || copy_count >= sizeof(dimm->label))
 537                 return -EINVAL;
 538
 539         strncpy(dimm->label, data, copy_count);
 540         dimm->label[copy_count] = '\0';
 541
 542         return count;
 543 }
 544
 545 static ssize_t dimmdev_size_show(struct device *dev,
 546                                  struct device_attribute *mattr, char *data)
 547 {
 548         struct dimm_info *dimm = to_dimm(dev);
 549
 550         return sprintf(data, "%u\n", PAGES_TO_MiB(dimm->nr_pages));
 551 }
 552
 553 static ssize_t dimmdev_mem_type_show(struct device *dev,
 554                                      struct device_attribute *mattr, char *data)
 555 {
 556         struct dimm_info *dimm = to_dimm(dev);
 557
 558         return sprintf(data, "%s\n", mem_types[dimm->mtype]);
 559 }
 560
 561 static ssize_t dimmdev_dev_type_show(struct device *dev,
 562                                      struct device_attribute *mattr, char *data)
 563 {
 564         struct dimm_info *dimm = to_dimm(dev);
 565
 566         return sprintf(data, "%s\n", dev_types[dimm->dtype]);
 567 }
 568
 569 static ssize_t dimmdev_edac_mode_show(struct device *dev,
 570                                       struct device_attribute *mattr,
 571                                       char *data)
 572 {
 573         struct dimm_info *dimm = to_dimm(dev);
 574
 575         return sprintf(data, "%s\n", edac_caps[dimm->edac_mode]);
 576 }
 577
 578 static ssize_t dimmdev_ce_count_show(struct device *dev,
 579                                       struct device_attribute *mattr,
 580                                       char *data)
 581 {
 582         struct dimm_info *dimm = to_dimm(dev);
 583         u32 count;
 584         int off;
 585
 586         off = EDAC_DIMM_OFF(dimm->mci->layers,
 587                             dimm->mci->n_layers,
 588                             dimm->location[0],
 589                             dimm->location[1],
 590                             dimm->location[2]);
 591         count = dimm->mci->ce_per_layer[dimm->mci->n_layers-1][off];
 592         return sprintf(data, "%u\n", count);
 593 }
 594
 595 static ssize_t dimmdev_ue_count_show(struct device *dev,
 596                                       struct device_attribute *mattr,
 597                                       char *data)
 598 {
 599         struct dimm_info *dimm = to_dimm(dev);
 600         u32 count;
 601         int off;
 602
 603         off = EDAC_DIMM_OFF(dimm->mci->layers,
 604                             dimm->mci->n_layers,
 605                             dimm->location[0],
 606                             dimm->location[1],
 607                             dimm->location[2]);
 608         count = dimm->mci->ue_per_layer[dimm->mci->n_layers-1][off];
 609         return sprintf(data, "%u\n", count);
 610 }
 611
 612 /* dimm/rank attribute files */
 613 static DEVICE_ATTR(dimm_label, S_IRUGO | S_IWUSR,
 614                    dimmdev_label_show, dimmdev_label_store);
 615 static DEVICE_ATTR(dimm_location, S_IRUGO, dimmdev_location_show, NULL);
 616 static DEVICE_ATTR(size, S_IRUGO, dimmdev_size_show, NULL);
 617 static DEVICE_ATTR(dimm_mem_type, S_IRUGO, dimmdev_mem_type_show, NULL);
 618 static DEVICE_ATTR(dimm_dev_type, S_IRUGO, dimmdev_dev_type_show, NULL);
 619 static DEVICE_ATTR(dimm_edac_mode, S_IRUGO, dimmdev_edac_mode_show, NULL);
 620 static DEVICE_ATTR(dimm_ce_count, S_IRUGO, dimmdev_ce_count_show, NULL);
 621 static DEVICE_ATTR(dimm_ue_count, S_IRUGO, dimmdev_ue_count_show, NULL);
 622
 623 /* attributes of the dimm<id>/rank<id> object */
 624 static struct attribute *dimm_attrs[] = {
 625         &dev_attr_dimm_label.attr,
 626         &dev_attr_dimm_location.attr,
 627         &dev_attr_size.attr,
 628         &dev_attr_dimm_mem_type.attr,
 629         &dev_attr_dimm_dev_type.attr,
 630         &dev_attr_dimm_edac_mode.attr,
 631         &dev_attr_dimm_ce_count.attr,
 632         &dev_attr_dimm_ue_count.attr,
 633         NULL,
 634 };
 635
 636 static const struct attribute_group dimm_attr_grp = {
 637         .attrs  = dimm_attrs,
 638 };
 639
 640 static const struct attribute_group *dimm_attr_groups[] = {
 641         &dimm_attr_grp,
 642         NULL
 643 };
 644
 645 static void dimm_attr_release(struct device *dev)
 646 {
 647         struct dimm_info *dimm = container_of(dev, struct dimm_info, dev);
 648
 649         edac_dbg(1, "Releasing dimm device %s\n", dev_name(dev));
 650         kfree(dimm);
 651 }
 652
 653 static const struct device_type dimm_attr_type = {
 654         .groups         = dimm_attr_groups,
 655         .release        = dimm_attr_release,
 656 };
 657
 658 /* Create a DIMM object under specifed memory controller device */
 659 static int edac_create_dimm_object(struct mem_ctl_info *mci,
 660                                    struct dimm_info *dimm,
 661                                    int index)
 662 {
 663         int err;
 664         dimm->mci = mci;
 665
 666         dimm->dev.type = &dimm_attr_type;
 667         dimm->dev.bus = mci->bus;
 668         device_initialize(&dimm->dev);
 669
 670         dimm->dev.parent = &mci->dev;
 671         if (mci->csbased)
 672                 dev_set_name(&dimm->dev, "rank%d", index);
 673         else
 674                 dev_set_name(&dimm->dev, "dimm%d", index);
 675         dev_set_drvdata(&dimm->dev, dimm);
 676         pm_runtime_forbid(&mci->dev);
 677
 678         err =  device_add(&dimm->dev);
 679
 680         edac_dbg(0, "creating rank/dimm device %s\n", dev_name(&dimm->dev));
 681
 682         return err;
 683 }
 684
 685 /*
 686  * Memory controller device
 687  */
 688
 689 #define to_mci(k) container_of(k, struct mem_ctl_info, dev)
 690
 691 static ssize_t mci_reset_counters_store(struct device *dev,
 692                                         struct device_attribute *mattr,
 693                                         const char *data, size_t count)
 694 {
 695         struct mem_ctl_info *mci = to_mci(dev);
 696         int cnt, row, chan, i;
 697         mci->ue_mc = 0;
 698         mci->ce_mc = 0;
 699         mci->ue_noinfo_count = 0;
 700         mci->ce_noinfo_count = 0;
 701
 702         for (row = 0; row < mci->nr_csrows; row++) {
 703                 struct csrow_info *ri = mci->csrows[row];
 704
 705                 ri->ue_count = 0;
 706                 ri->ce_count = 0;
 707
 708                 for (chan = 0; chan < ri->nr_channels; chan++)
 709                         ri->channels[chan]->ce_count = 0;
 710         }
 711
 712         cnt = 1;
 713         for (i = 0; i < mci->n_layers; i++) {
 714                 cnt *= mci->layers[i].size;
 715                 memset(mci->ce_per_layer[i], 0, cnt * sizeof(u32));
 716                 memset(mci->ue_per_layer[i], 0, cnt * sizeof(u32));
 717         }
 718
 719         mci->start_time = jiffies;
 720         return count;
 721 }
 722
 723 /* Memory scrubbing interface:
 724  *
 725  * A MC driver can limit the scrubbing bandwidth based on the CPU type.
 726  * Therefore, ->set_sdram_scrub_rate should be made to return the actual
 727  * bandwidth that is accepted or 0 when scrubbing is to be disabled.
 728  *
 729  * Negative value still means that an error has occurred while setting
 730  * the scrub rate.
 731  */
 732 static ssize_t mci_sdram_scrub_rate_store(struct device *dev,
 733                                           struct device_attribute *mattr,
 734                                           const char *data, size_t count)
 735 {
 736         struct mem_ctl_info *mci = to_mci(dev);
 737         unsigned long bandwidth = 0;
 738         int new_bw = 0;
 739
 740         if (kstrtoul(data, 10, &bandwidth) < 0)
 741                 return -EINVAL;
 742
 743         new_bw = mci->set_sdram_scrub_rate(mci, bandwidth);
 744         if (new_bw < 0) {
 745                 edac_printk(KERN_WARNING, EDAC_MC,
 746                             "Error setting scrub rate to: %lu\n", bandwidth);
 747                 return -EINVAL;
 748         }
 749
 750         return count;
 751 }
 752
 753 /*
 754  * ->get_sdram_scrub_rate() return value semantics same as above.
 755  */
 756 static ssize_t mci_sdram_scrub_rate_show(struct device *dev,
 757                                          struct device_attribute *mattr,
 758                                          char *data)
 759 {
 760         struct mem_ctl_info *mci = to_mci(dev);
 761         int bandwidth = 0;
 762
 763         bandwidth = mci->get_sdram_scrub_rate(mci);
 764         if (bandwidth < 0) {
 765                 edac_printk(KERN_DEBUG, EDAC_MC, "Error reading scrub rate\n");
 766                 return bandwidth;
 767         }
 768
 769         return sprintf(data, "%d\n", bandwidth);
 770 }
 771
 772 /* default attribute files for the MCI object */
 773 static ssize_t mci_ue_count_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_mc);
 780 }
 781
 782 static ssize_t mci_ce_count_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, "%d\n", mci->ce_mc);
 789 }
 790
 791 static ssize_t mci_ce_noinfo_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, "%d\n", mci->ce_noinfo_count);
 798 }
 799
 800 static ssize_t mci_ue_noinfo_show(struct device *dev,
 801                                   struct device_attribute *mattr,
 802                                   char *data)
 803 {
 804         struct mem_ctl_info *mci = to_mci(dev);
 805
 806         return sprintf(data, "%d\n", mci->ue_noinfo_count);
 807 }
 808
 809 static ssize_t mci_seconds_show(struct device *dev,
 810                                 struct device_attribute *mattr,
 811                                 char *data)
 812 {
 813         struct mem_ctl_info *mci = to_mci(dev);
 814
 815         return sprintf(data, "%ld\n", (jiffies - mci->start_time) / HZ);
 816 }
 817
 818 static ssize_t mci_ctl_name_show(struct device *dev,
 819                                  struct device_attribute *mattr,
 820                                  char *data)
 821 {
 822         struct mem_ctl_info *mci = to_mci(dev);
 823
 824         return sprintf(data, "%s\n", mci->ctl_name);
 825 }
 826
 827 static ssize_t mci_size_mb_show(struct device *dev,
 828                                 struct device_attribute *mattr,
 829                                 char *data)
 830 {
 831         struct mem_ctl_info *mci = to_mci(dev);
 832         int total_pages = 0, csrow_idx, j;
 833
 834         for (csrow_idx = 0; csrow_idx < mci->nr_csrows; csrow_idx++) {
 835                 struct csrow_info *csrow = mci->csrows[csrow_idx];
 836
 837                 for (j = 0; j < csrow->nr_channels; j++) {
 838                         struct dimm_info *dimm = csrow->channels[j]->dimm;
 839
 840                         total_pages += dimm->nr_pages;
 841                 }
 842         }
 843
 844         return sprintf(data, "%u\n", PAGES_TO_MiB(total_pages));
 845 }
 846
 847 static ssize_t mci_max_location_show(struct device *dev,
 848                                      struct device_attribute *mattr,
 849                                      char *data)
 850 {
 851         struct mem_ctl_info *mci = to_mci(dev);
 852         int i;
 853         char *p = data;
 854
 855         for (i = 0; i < mci->n_layers; i++) {
 856                 p += sprintf(p, "%s %d ",
 857                              edac_layer_name[mci->layers[i].type],
 858                              mci->layers[i].size - 1);
 859         }
 860
 861         return p - data;
 862 }
 863
 864 /* default Control file */
 865 static DEVICE_ATTR(reset_counters, S_IWUSR, NULL, mci_reset_counters_store);
 866
 867 /* default Attribute files */
 868 static DEVICE_ATTR(mc_name, S_IRUGO, mci_ctl_name_show, NULL);
 869 static DEVICE_ATTR(size_mb, S_IRUGO, mci_size_mb_show, NULL);
 870 static DEVICE_ATTR(seconds_since_reset, S_IRUGO, mci_seconds_show, NULL);
 871 static DEVICE_ATTR(ue_noinfo_count, S_IRUGO, mci_ue_noinfo_show, NULL);
 872 static DEVICE_ATTR(ce_noinfo_count, S_IRUGO, mci_ce_noinfo_show, NULL);
 873 static DEVICE_ATTR(ue_count, S_IRUGO, mci_ue_count_show, NULL);
 874 static DEVICE_ATTR(ce_count, S_IRUGO, mci_ce_count_show, NULL);
 875 static DEVICE_ATTR(max_location, S_IRUGO, mci_max_location_show, NULL);
 876
 877 /* memory scrubber attribute file */
 878 static DEVICE_ATTR(sdram_scrub_rate, 0, mci_sdram_scrub_rate_show,
 879             mci_sdram_scrub_rate_store); /* umode set later in is_visible */
 880
 881 static struct attribute *mci_attrs[] = {
 882         &dev_attr_reset_counters.attr,
 883         &dev_attr_mc_name.attr,
 884         &dev_attr_size_mb.attr,
 885         &dev_attr_seconds_since_reset.attr,
 886         &dev_attr_ue_noinfo_count.attr,
 887         &dev_attr_ce_noinfo_count.attr,
 888         &dev_attr_ue_count.attr,
 889         &dev_attr_ce_count.attr,
 890         &dev_attr_max_location.attr,
 891         &dev_attr_sdram_scrub_rate.attr,
 892         NULL
 893 };
 894
 895 static umode_t mci_attr_is_visible(struct kobject *kobj,
 896                                    struct attribute *attr, int idx)
 897 {
 898         struct device *dev = kobj_to_dev(kobj);
 899         struct mem_ctl_info *mci = to_mci(dev);
 900         umode_t mode = 0;
 901
 902         if (attr != &dev_attr_sdram_scrub_rate.attr)
 903                 return attr->mode;
 904         if (mci->get_sdram_scrub_rate)
 905                 mode |= S_IRUGO;
 906         if (mci->set_sdram_scrub_rate)
 907                 mode |= S_IWUSR;
 908         return mode;
 909 }
 910
 911 static const struct attribute_group mci_attr_grp = {
 912         .attrs  = mci_attrs,
 913         .is_visible = mci_attr_is_visible,
 914 };
 915
 916 static const struct attribute_group *mci_attr_groups[] = {
 917         &mci_attr_grp,
 918         NULL
 919 };
 920
 921 static void mci_attr_release(struct device *dev)
 922 {
 923         struct mem_ctl_info *mci = container_of(dev, struct mem_ctl_info, dev);
 924
 925         edac_dbg(1, "Releasing csrow device %s\n", dev_name(dev));
 926         kfree(mci);
 927 }
 928
 929 static const struct device_type mci_attr_type = {
 930         .groups         = mci_attr_groups,
 931         .release        = mci_attr_release,
 932 };
 933
 934 /*
 935  * Create a new Memory Controller kobject instance,
 936  *      mc<id> under the 'mc' directory
 937  *
 938  * Return:
 939  *      0       Success
 940  *      !0      Failure
 941  */
 942 int edac_create_sysfs_mci_device(struct mem_ctl_info *mci,
 943                                  const struct attribute_group **groups)
 944 {
 945         char *name;
 946         int i, err;
 947
 948         /*
 949          * The memory controller needs its own bus, in order to avoid
 950          * namespace conflicts at /sys/bus/edac.
 951          */
 952         name = kasprintf(GFP_KERNEL, "mc%d", mci->mc_idx);
 953         if (!name)
 954                 return -ENOMEM;
 955
 956         mci->bus->name = name;
 957
 958         edac_dbg(0, "creating bus %s\n", mci->bus->name);
 959
 960         err = bus_register(mci->bus);
 961         if (err < 0) {
 962                 kfree(name);
 963                 return err;
 964         }
 965
 966         /* get the /sys/devices/system/edac subsys reference */
 967         mci->dev.type = &mci_attr_type;
 968         device_initialize(&mci->dev);
 969
 970         mci->dev.parent = mci_pdev;
 971         mci->dev.bus = mci->bus;
 972         mci->dev.groups = groups;
 973         dev_set_name(&mci->dev, "mc%d", mci->mc_idx);
 974         dev_set_drvdata(&mci->dev, mci);
 975         pm_runtime_forbid(&mci->dev);
 976
 977         edac_dbg(0, "creating device %s\n", dev_name(&mci->dev));
 978         err = device_add(&mci->dev);
 979         if (err < 0) {
 980                 edac_dbg(1, "failure: create device %s\n", dev_name(&mci->dev));
 981                 goto fail_unregister_bus;
 982         }
 983
 984         /*
 985          * Create the dimm/rank devices
 986          */
 987         for (i = 0; i < mci->tot_dimms; i++) {
 988                 struct dimm_info *dimm = mci->dimms[i];
 989                 /* Only expose populated DIMMs */
 990                 if (!dimm->nr_pages)
 991                         continue;
 992
 993 #ifdef CONFIG_EDAC_DEBUG
 994                 edac_dbg(1, "creating dimm%d, located at ", i);
 995                 if (edac_debug_level >= 1) {
 996                         int lay;
 997                         for (lay = 0; lay < mci->n_layers; lay++)
 998                                 printk(KERN_CONT "%s %d ",
 999                                         edac_layer_name[mci->layers[lay].type],
1000                                         dimm->location[lay]);
1001                         printk(KERN_CONT "\n");
1002                 }
1003 #endif
1004                 err = edac_create_dimm_object(mci, dimm, i);
1005                 if (err) {
1006                         edac_dbg(1, "failure: create dimm %d obj\n", i);
1007                         goto fail_unregister_dimm;
1008                 }
1009         }
1010
1011 #ifdef CONFIG_EDAC_LEGACY_SYSFS
1012         err = edac_create_csrow_objects(mci);
1013         if (err < 0)
1014                 goto fail_unregister_dimm;
1015 #endif
1016
1017         edac_create_debugfs_nodes(mci);
1018         return 0;
1019
1020 fail_unregister_dimm:
1021         for (i--; i >= 0; i--) {
1022                 struct dimm_info *dimm = mci->dimms[i];
1023                 if (!dimm->nr_pages)
1024                         continue;
1025
1026                 device_unregister(&dimm->dev);
1027         }
1028         device_unregister(&mci->dev);
1029 fail_unregister_bus:
1030         bus_unregister(mci->bus);
1031         kfree(name);
1032
1033         return err;
1034 }
1035
1036 /*
1037  * remove a Memory Controller instance
1038  */
1039 void edac_remove_sysfs_mci_device(struct mem_ctl_info *mci)
1040 {
1041         int i;
1042
1043         edac_dbg(0, "\n");
1044
1045 #ifdef CONFIG_EDAC_DEBUG
1046         edac_debugfs_remove_recursive(mci->debugfs);
1047 #endif
1048 #ifdef CONFIG_EDAC_LEGACY_SYSFS
1049         edac_delete_csrow_objects(mci);
1050 #endif
1051
1052         for (i = 0; i < mci->tot_dimms; i++) {
1053                 struct dimm_info *dimm = mci->dimms[i];
1054                 if (dimm->nr_pages == 0)
1055                         continue;
1056                 edac_dbg(0, "removing device %s\n", dev_name(&dimm->dev));
1057                 device_unregister(&dimm->dev);
1058         }
1059 }
1060
1061 void edac_unregister_sysfs(struct mem_ctl_info *mci)
1062 {
1063         struct bus_type *bus = mci->bus;
1064         const char *name = mci->bus->name;
1065
1066         edac_dbg(1, "Unregistering device %s\n", dev_name(&mci->dev));
1067         device_unregister(&mci->dev);
1068         bus_unregister(bus);
1069         kfree(name);
1070 }
1071
1072 static void mc_attr_release(struct device *dev)
1073 {
1074         /*
1075          * There's no container structure here, as this is just the mci
1076          * parent device, used to create the /sys/devices/mc sysfs node.
1077          * So, there are no attributes on it.
1078          */
1079         edac_dbg(1, "Releasing device %s\n", dev_name(dev));
1080         kfree(dev);
1081 }
1082
1083 static const struct device_type mc_attr_type = {
1084         .release        = mc_attr_release,
1085 };
1086 /*
1087  * Init/exit code for the module. Basically, creates/removes /sys/class/rc
1088  */
1089 int __init edac_mc_sysfs_init(void)
1090 {
1091         int err;
1092
1093         mci_pdev = kzalloc(sizeof(*mci_pdev), GFP_KERNEL);
1094         if (!mci_pdev) {
1095                 err = -ENOMEM;
1096                 goto out;
1097         }
1098
1099         mci_pdev->bus = edac_get_sysfs_subsys();
1100         mci_pdev->type = &mc_attr_type;
1101         device_initialize(mci_pdev);
1102         dev_set_name(mci_pdev, "mc");
1103
1104         err = device_add(mci_pdev);
1105         if (err < 0)
1106                 goto out_put_device;
1107
1108         edac_dbg(0, "device %s created\n", dev_name(mci_pdev));
1109
1110         return 0;
1111
1112  out_put_device:
1113         put_device(mci_pdev);
1114  out:
1115         return err;
1116 }
1117
1118 void edac_mc_sysfs_exit(void)
1119 {
1120         device_unregister(mci_pdev);
1121 }