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 - Mauro Carvalho Chehab <mchehab@redhat.com>
  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_core.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, struct kernel_param *kp)
  54 {
  55         long l;
  56         int ret;
  57
  58         if (!val)
  59                 return -EINVAL;
  60
  61         ret = strict_strtol(val, 0, &l);
  62         if (ret == -EINVAL || ((int)l != l))
  63                 return -EINVAL;
  64         *((int *)kp->arg) = l;
  65
  66         /* notify edac_mc engine to reset the poll period */
  67         edac_mc_reset_delay_period(l);
  68
  69         return 0;
  70 }
  71
  72 /* Parameter declarations for above */
  73 module_param(edac_mc_panic_on_ue, int, 0644);
  74 MODULE_PARM_DESC(edac_mc_panic_on_ue, "Panic on uncorrected error: 0=off 1=on");
  75 module_param(edac_mc_log_ue, int, 0644);
  76 MODULE_PARM_DESC(edac_mc_log_ue,
  77                  "Log uncorrectable error to console: 0=off 1=on");
  78 module_param(edac_mc_log_ce, int, 0644);
  79 MODULE_PARM_DESC(edac_mc_log_ce,
  80                  "Log correctable error to console: 0=off 1=on");
  81 module_param_call(edac_mc_poll_msec, edac_set_poll_msec, param_get_int,
  82                   &edac_mc_poll_msec, 0644);
  83 MODULE_PARM_DESC(edac_mc_poll_msec, "Polling period in milliseconds");
  84
  85 static struct device *mci_pdev;
  86
  87 /*
  88  * various constants for Memory Controllers
  89  */
  90 static const char *mem_types[] = {
  91         [MEM_EMPTY] = "Empty",
  92         [MEM_RESERVED] = "Reserved",
  93         [MEM_UNKNOWN] = "Unknown",
  94         [MEM_FPM] = "FPM",
  95         [MEM_EDO] = "EDO",
  96         [MEM_BEDO] = "BEDO",
  97         [MEM_SDR] = "Unbuffered-SDR",
  98         [MEM_RDR] = "Registered-SDR",
  99         [MEM_DDR] = "Unbuffered-DDR",
 100         [MEM_RDDR] = "Registered-DDR",
 101         [MEM_RMBS] = "RMBS",
 102         [MEM_DDR2] = "Unbuffered-DDR2",
 103         [MEM_FB_DDR2] = "FullyBuffered-DDR2",
 104         [MEM_RDDR2] = "Registered-DDR2",
 105         [MEM_XDR] = "XDR",
 106         [MEM_DDR3] = "Unbuffered-DDR3",
 107         [MEM_RDDR3] = "Registered-DDR3"
 108 };
 109
 110 static const char *dev_types[] = {
 111         [DEV_UNKNOWN] = "Unknown",
 112         [DEV_X1] = "x1",
 113         [DEV_X2] = "x2",
 114         [DEV_X4] = "x4",
 115         [DEV_X8] = "x8",
 116         [DEV_X16] = "x16",
 117         [DEV_X32] = "x32",
 118         [DEV_X64] = "x64"
 119 };
 120
 121 static const char *edac_caps[] = {
 122         [EDAC_UNKNOWN] = "Unknown",
 123         [EDAC_NONE] = "None",
 124         [EDAC_RESERVED] = "Reserved",
 125         [EDAC_PARITY] = "PARITY",
 126         [EDAC_EC] = "EC",
 127         [EDAC_SECDED] = "SECDED",
 128         [EDAC_S2ECD2ED] = "S2ECD2ED",
 129         [EDAC_S4ECD4ED] = "S4ECD4ED",
 130         [EDAC_S8ECD8ED] = "S8ECD8ED",
 131         [EDAC_S16ECD16ED] = "S16ECD16ED"
 132 };
 133
 134 #ifdef CONFIG_EDAC_LEGACY_SYSFS
 135 /*
 136  * EDAC sysfs CSROW data structures and methods
 137  */
 138
 139 #define to_csrow(k) container_of(k, struct csrow_info, dev)
 140
 141 /*
 142  * We need it to avoid namespace conflicts between the legacy API
 143  * and the per-dimm/per-rank one
 144  */
 145 #define DEVICE_ATTR_LEGACY(_name, _mode, _show, _store) \
 146         struct device_attribute dev_attr_legacy_##_name = __ATTR(_name, _mode, _show, _store)
 147
 148 struct dev_ch_attribute {
 149         struct device_attribute attr;
 150         int channel;
 151 };
 152
 153 #define DEVICE_CHANNEL(_name, _mode, _show, _store, _var) \
 154         struct dev_ch_attribute dev_attr_legacy_##_name = \
 155                 { __ATTR(_name, _mode, _show, _store), (_var) }
 156
 157 #define to_channel(k) (container_of(k, struct dev_ch_attribute, attr)->channel)
 158
 159 /* Set of more default csrow<id> attribute show/store functions */
 160 static ssize_t csrow_ue_count_show(struct device *dev,
 161                                    struct device_attribute *mattr, char *data)
 162 {
 163         struct csrow_info *csrow = to_csrow(dev);
 164
 165         return sprintf(data, "%u\n", csrow->ue_count);
 166 }
 167
 168 static ssize_t csrow_ce_count_show(struct device *dev,
 169                                    struct device_attribute *mattr, char *data)
 170 {
 171         struct csrow_info *csrow = to_csrow(dev);
 172
 173         return sprintf(data, "%u\n", csrow->ce_count);
 174 }
 175
 176 static ssize_t csrow_size_show(struct device *dev,
 177                                struct device_attribute *mattr, char *data)
 178 {
 179         struct csrow_info *csrow = to_csrow(dev);
 180         int i;
 181         u32 nr_pages = 0;
 182
 183         if (csrow->mci->csbased)
 184                 return sprintf(data, "%u\n", PAGES_TO_MiB(csrow->nr_pages));
 185
 186         for (i = 0; i < csrow->nr_channels; i++)
 187                 nr_pages += csrow->channels[i]->dimm->nr_pages;
 188         return sprintf(data, "%u\n", PAGES_TO_MiB(nr_pages));
 189 }
 190
 191 static ssize_t csrow_mem_type_show(struct device *dev,
 192                                    struct device_attribute *mattr, char *data)
 193 {
 194         struct csrow_info *csrow = to_csrow(dev);
 195
 196         return sprintf(data, "%s\n", mem_types[csrow->channels[0]->dimm->mtype]);
 197 }
 198
 199 static ssize_t csrow_dev_type_show(struct device *dev,
 200                                    struct device_attribute *mattr, char *data)
 201 {
 202         struct csrow_info *csrow = to_csrow(dev);
 203
 204         return sprintf(data, "%s\n", dev_types[csrow->channels[0]->dimm->dtype]);
 205 }
 206
 207 static ssize_t csrow_edac_mode_show(struct device *dev,
 208                                     struct device_attribute *mattr,
 209                                     char *data)
 210 {
 211         struct csrow_info *csrow = to_csrow(dev);
 212
 213         return sprintf(data, "%s\n", edac_caps[csrow->channels[0]->dimm->edac_mode]);
 214 }
 215
 216 /* show/store functions for DIMM Label attributes */
 217 static ssize_t channel_dimm_label_show(struct device *dev,
 218                                        struct device_attribute *mattr,
 219                                        char *data)
 220 {
 221         struct csrow_info *csrow = to_csrow(dev);
 222         unsigned chan = to_channel(mattr);
 223         struct rank_info *rank = csrow->channels[chan];
 224
 225         /* if field has not been initialized, there is nothing to send */
 226         if (!rank->dimm->label[0])
 227                 return 0;
 228
 229         return snprintf(data, EDAC_MC_LABEL_LEN, "%s\n",
 230                         rank->dimm->label);
 231 }
 232
 233 static ssize_t channel_dimm_label_store(struct device *dev,
 234                                         struct device_attribute *mattr,
 235                                         const char *data, size_t count)
 236 {
 237         struct csrow_info *csrow = to_csrow(dev);
 238         unsigned chan = to_channel(mattr);
 239         struct rank_info *rank = csrow->channels[chan];
 240
 241         ssize_t max_size = 0;
 242
 243         max_size = min((ssize_t) count, (ssize_t) EDAC_MC_LABEL_LEN - 1);
 244         strncpy(rank->dimm->label, data, max_size);
 245         rank->dimm->label[max_size] = '\0';
 246
 247         return max_size;
 248 }
 249
 250 /* show function for dynamic chX_ce_count attribute */
 251 static ssize_t channel_ce_count_show(struct device *dev,
 252                                      struct device_attribute *mattr, char *data)
 253 {
 254         struct csrow_info *csrow = to_csrow(dev);
 255         unsigned chan = to_channel(mattr);
 256         struct rank_info *rank = csrow->channels[chan];
 257
 258         return sprintf(data, "%u\n", rank->ce_count);
 259 }
 260
 261 /* cwrow<id>/attribute files */
 262 DEVICE_ATTR_LEGACY(size_mb, S_IRUGO, csrow_size_show, NULL);
 263 DEVICE_ATTR_LEGACY(dev_type, S_IRUGO, csrow_dev_type_show, NULL);
 264 DEVICE_ATTR_LEGACY(mem_type, S_IRUGO, csrow_mem_type_show, NULL);
 265 DEVICE_ATTR_LEGACY(edac_mode, S_IRUGO, csrow_edac_mode_show, NULL);
 266 DEVICE_ATTR_LEGACY(ue_count, S_IRUGO, csrow_ue_count_show, NULL);
 267 DEVICE_ATTR_LEGACY(ce_count, S_IRUGO, csrow_ce_count_show, NULL);
 268
 269 /* default attributes of the CSROW<id> object */
 270 static struct attribute *csrow_attrs[] = {
 271         &dev_attr_legacy_dev_type.attr,
 272         &dev_attr_legacy_mem_type.attr,
 273         &dev_attr_legacy_edac_mode.attr,
 274         &dev_attr_legacy_size_mb.attr,
 275         &dev_attr_legacy_ue_count.attr,
 276         &dev_attr_legacy_ce_count.attr,
 277         NULL,
 278 };
 279
 280 static struct attribute_group csrow_attr_grp = {
 281         .attrs  = csrow_attrs,
 282 };
 283
 284 static const struct attribute_group *csrow_attr_groups[] = {
 285         &csrow_attr_grp,
 286         NULL
 287 };
 288
 289 static void csrow_attr_release(struct device *dev)
 290 {
 291         struct csrow_info *csrow = container_of(dev, struct csrow_info, dev);
 292
 293         edac_dbg(1, "Releasing csrow device %s\n", dev_name(dev));
 294         kfree(csrow);
 295 }
 296
 297 static struct device_type csrow_attr_type = {
 298         .groups         = csrow_attr_groups,
 299         .release        = csrow_attr_release,
 300 };
 301
 302 /*
 303  * possible dynamic channel DIMM Label attribute files
 304  *
 305  */
 306
 307 #define EDAC_NR_CHANNELS        6
 308
 309 DEVICE_CHANNEL(ch0_dimm_label, S_IRUGO | S_IWUSR,
 310         channel_dimm_label_show, channel_dimm_label_store, 0);
 311 DEVICE_CHANNEL(ch1_dimm_label, S_IRUGO | S_IWUSR,
 312         channel_dimm_label_show, channel_dimm_label_store, 1);
 313 DEVICE_CHANNEL(ch2_dimm_label, S_IRUGO | S_IWUSR,
 314         channel_dimm_label_show, channel_dimm_label_store, 2);
 315 DEVICE_CHANNEL(ch3_dimm_label, S_IRUGO | S_IWUSR,
 316         channel_dimm_label_show, channel_dimm_label_store, 3);
 317 DEVICE_CHANNEL(ch4_dimm_label, S_IRUGO | S_IWUSR,
 318         channel_dimm_label_show, channel_dimm_label_store, 4);
 319 DEVICE_CHANNEL(ch5_dimm_label, S_IRUGO | S_IWUSR,
 320         channel_dimm_label_show, channel_dimm_label_store, 5);
 321
 322 /* Total possible dynamic DIMM Label attribute file table */
 323 static struct device_attribute *dynamic_csrow_dimm_attr[] = {
 324         &dev_attr_legacy_ch0_dimm_label.attr,
 325         &dev_attr_legacy_ch1_dimm_label.attr,
 326         &dev_attr_legacy_ch2_dimm_label.attr,
 327         &dev_attr_legacy_ch3_dimm_label.attr,
 328         &dev_attr_legacy_ch4_dimm_label.attr,
 329         &dev_attr_legacy_ch5_dimm_label.attr
 330 };
 331
 332 /* possible dynamic channel ce_count attribute files */
 333 DEVICE_CHANNEL(ch0_ce_count, S_IRUGO | S_IWUSR,
 334                    channel_ce_count_show, NULL, 0);
 335 DEVICE_CHANNEL(ch1_ce_count, S_IRUGO | S_IWUSR,
 336                    channel_ce_count_show, NULL, 1);
 337 DEVICE_CHANNEL(ch2_ce_count, S_IRUGO | S_IWUSR,
 338                    channel_ce_count_show, NULL, 2);
 339 DEVICE_CHANNEL(ch3_ce_count, S_IRUGO | S_IWUSR,
 340                    channel_ce_count_show, NULL, 3);
 341 DEVICE_CHANNEL(ch4_ce_count, S_IRUGO | S_IWUSR,
 342                    channel_ce_count_show, NULL, 4);
 343 DEVICE_CHANNEL(ch5_ce_count, S_IRUGO | S_IWUSR,
 344                    channel_ce_count_show, NULL, 5);
 345
 346 /* Total possible dynamic ce_count attribute file table */
 347 static struct device_attribute *dynamic_csrow_ce_count_attr[] = {
 348         &dev_attr_legacy_ch0_ce_count.attr,
 349         &dev_attr_legacy_ch1_ce_count.attr,
 350         &dev_attr_legacy_ch2_ce_count.attr,
 351         &dev_attr_legacy_ch3_ce_count.attr,
 352         &dev_attr_legacy_ch4_ce_count.attr,
 353         &dev_attr_legacy_ch5_ce_count.attr
 354 };
 355
 356 static inline int nr_pages_per_csrow(struct csrow_info *csrow)
 357 {
 358         int chan, nr_pages = 0;
 359
 360         for (chan = 0; chan < csrow->nr_channels; chan++)
 361                 nr_pages += csrow->channels[chan]->dimm->nr_pages;
 362
 363         return nr_pages;
 364 }
 365
 366 /* Create a CSROW object under specifed edac_mc_device */
 367 static int edac_create_csrow_object(struct mem_ctl_info *mci,
 368                                     struct csrow_info *csrow, int index)
 369 {
 370         int err, chan;
 371
 372         if (csrow->nr_channels >= EDAC_NR_CHANNELS)
 373                 return -ENODEV;
 374
 375         csrow->dev.type = &csrow_attr_type;
 376         csrow->dev.bus = &mci->bus;
 377         device_initialize(&csrow->dev);
 378         csrow->dev.parent = &mci->dev;
 379         csrow->mci = mci;
 380         dev_set_name(&csrow->dev, "csrow%d", index);
 381         dev_set_drvdata(&csrow->dev, csrow);
 382
 383         edac_dbg(0, "creating (virtual) csrow node %s\n",
 384                  dev_name(&csrow->dev));
 385
 386         err = device_add(&csrow->dev);
 387         if (err < 0)
 388                 return err;
 389
 390         for (chan = 0; chan < csrow->nr_channels; chan++) {
 391                 /* Only expose populated DIMMs */
 392                 if (!csrow->channels[chan]->dimm->nr_pages)
 393                         continue;
 394                 err = device_create_file(&csrow->dev,
 395                                          dynamic_csrow_dimm_attr[chan]);
 396                 if (err < 0)
 397                         goto error;
 398                 err = device_create_file(&csrow->dev,
 399                                          dynamic_csrow_ce_count_attr[chan]);
 400                 if (err < 0) {
 401                         device_remove_file(&csrow->dev,
 402                                            dynamic_csrow_dimm_attr[chan]);
 403                         goto error;
 404                 }
 405         }
 406
 407         return 0;
 408
 409 error:
 410         for (--chan; chan >= 0; chan--) {
 411                 device_remove_file(&csrow->dev,
 412                                         dynamic_csrow_dimm_attr[chan]);
 413                 device_remove_file(&csrow->dev,
 414                                            dynamic_csrow_ce_count_attr[chan]);
 415         }
 416         put_device(&csrow->dev);
 417
 418         return err;
 419 }
 420
 421 /* Create a CSROW object under specifed edac_mc_device */
 422 static int edac_create_csrow_objects(struct mem_ctl_info *mci)
 423 {
 424         int err, i, chan;
 425         struct csrow_info *csrow;
 426
 427         for (i = 0; i < mci->nr_csrows; i++) {
 428                 csrow = mci->csrows[i];
 429                 if (!nr_pages_per_csrow(csrow))
 430                         continue;
 431                 err = edac_create_csrow_object(mci, mci->csrows[i], i);
 432                 if (err < 0)
 433                         goto error;
 434         }
 435         return 0;
 436
 437 error:
 438         for (--i; i >= 0; i--) {
 439                 csrow = mci->csrows[i];
 440                 if (!nr_pages_per_csrow(csrow))
 441                         continue;
 442                 for (chan = csrow->nr_channels - 1; chan >= 0; chan--) {
 443                         if (!csrow->channels[chan]->dimm->nr_pages)
 444                                 continue;
 445                         device_remove_file(&csrow->dev,
 446                                                 dynamic_csrow_dimm_attr[chan]);
 447                         device_remove_file(&csrow->dev,
 448                                                 dynamic_csrow_ce_count_attr[chan]);
 449                 }
 450                 put_device(&mci->csrows[i]->dev);
 451         }
 452
 453         return err;
 454 }
 455
 456 static void edac_delete_csrow_objects(struct mem_ctl_info *mci)
 457 {
 458         int i, chan;
 459         struct csrow_info *csrow;
 460
 461         for (i = mci->nr_csrows - 1; i >= 0; i--) {
 462                 csrow = mci->csrows[i];
 463                 if (!nr_pages_per_csrow(csrow))
 464                         continue;
 465                 for (chan = csrow->nr_channels - 1; chan >= 0; chan--) {
 466                         if (!csrow->channels[chan]->dimm->nr_pages)
 467                                 continue;
 468                         edac_dbg(1, "Removing csrow %d channel %d sysfs nodes\n",
 469                                  i, chan);
 470                         device_remove_file(&csrow->dev,
 471                                                 dynamic_csrow_dimm_attr[chan]);
 472                         device_remove_file(&csrow->dev,
 473                                                 dynamic_csrow_ce_count_attr[chan]);
 474                 }
 475                 device_unregister(&mci->csrows[i]->dev);
 476         }
 477 }
 478 #endif
 479
 480 /*
 481  * Per-dimm (or per-rank) devices
 482  */
 483
 484 #define to_dimm(k) container_of(k, struct dimm_info, dev)
 485
 486 /* show/store functions for DIMM Label attributes */
 487 static ssize_t dimmdev_location_show(struct device *dev,
 488                                      struct device_attribute *mattr, char *data)
 489 {
 490         struct dimm_info *dimm = to_dimm(dev);
 491
 492         return edac_dimm_info_location(dimm, data, PAGE_SIZE);
 493 }
 494
 495 static ssize_t dimmdev_label_show(struct device *dev,
 496                                   struct device_attribute *mattr, char *data)
 497 {
 498         struct dimm_info *dimm = to_dimm(dev);
 499
 500         /* if field has not been initialized, there is nothing to send */
 501         if (!dimm->label[0])
 502                 return 0;
 503
 504         return snprintf(data, EDAC_MC_LABEL_LEN, "%s\n", dimm->label);
 505 }
 506
 507 static ssize_t dimmdev_label_store(struct device *dev,
 508                                    struct device_attribute *mattr,
 509                                    const char *data,
 510                                    size_t count)
 511 {
 512         struct dimm_info *dimm = to_dimm(dev);
 513
 514         ssize_t max_size = 0;
 515
 516         max_size = min((ssize_t) count, (ssize_t) EDAC_MC_LABEL_LEN - 1);
 517         strncpy(dimm->label, data, max_size);
 518         dimm->label[max_size] = '\0';
 519
 520         return max_size;
 521 }
 522
 523 static ssize_t dimmdev_size_show(struct device *dev,
 524                                  struct device_attribute *mattr, char *data)
 525 {
 526         struct dimm_info *dimm = to_dimm(dev);
 527
 528         return sprintf(data, "%u\n", PAGES_TO_MiB(dimm->nr_pages));
 529 }
 530
 531 static ssize_t dimmdev_mem_type_show(struct device *dev,
 532                                      struct device_attribute *mattr, char *data)
 533 {
 534         struct dimm_info *dimm = to_dimm(dev);
 535
 536         return sprintf(data, "%s\n", mem_types[dimm->mtype]);
 537 }
 538
 539 static ssize_t dimmdev_dev_type_show(struct device *dev,
 540                                      struct device_attribute *mattr, char *data)
 541 {
 542         struct dimm_info *dimm = to_dimm(dev);
 543
 544         return sprintf(data, "%s\n", dev_types[dimm->dtype]);
 545 }
 546
 547 static ssize_t dimmdev_edac_mode_show(struct device *dev,
 548                                       struct device_attribute *mattr,
 549                                       char *data)
 550 {
 551         struct dimm_info *dimm = to_dimm(dev);
 552
 553         return sprintf(data, "%s\n", edac_caps[dimm->edac_mode]);
 554 }
 555
 556 /* dimm/rank attribute files */
 557 static DEVICE_ATTR(dimm_label, S_IRUGO | S_IWUSR,
 558                    dimmdev_label_show, dimmdev_label_store);
 559 static DEVICE_ATTR(dimm_location, S_IRUGO, dimmdev_location_show, NULL);
 560 static DEVICE_ATTR(size, S_IRUGO, dimmdev_size_show, NULL);
 561 static DEVICE_ATTR(dimm_mem_type, S_IRUGO, dimmdev_mem_type_show, NULL);
 562 static DEVICE_ATTR(dimm_dev_type, S_IRUGO, dimmdev_dev_type_show, NULL);
 563 static DEVICE_ATTR(dimm_edac_mode, S_IRUGO, dimmdev_edac_mode_show, NULL);
 564
 565 /* attributes of the dimm<id>/rank<id> object */
 566 static struct attribute *dimm_attrs[] = {
 567         &dev_attr_dimm_label.attr,
 568         &dev_attr_dimm_location.attr,
 569         &dev_attr_size.attr,
 570         &dev_attr_dimm_mem_type.attr,
 571         &dev_attr_dimm_dev_type.attr,
 572         &dev_attr_dimm_edac_mode.attr,
 573         NULL,
 574 };
 575
 576 static struct attribute_group dimm_attr_grp = {
 577         .attrs  = dimm_attrs,
 578 };
 579
 580 static const struct attribute_group *dimm_attr_groups[] = {
 581         &dimm_attr_grp,
 582         NULL
 583 };
 584
 585 static void dimm_attr_release(struct device *dev)
 586 {
 587         struct dimm_info *dimm = container_of(dev, struct dimm_info, dev);
 588
 589         edac_dbg(1, "Releasing dimm device %s\n", dev_name(dev));
 590         kfree(dimm);
 591 }
 592
 593 static struct device_type dimm_attr_type = {
 594         .groups         = dimm_attr_groups,
 595         .release        = dimm_attr_release,
 596 };
 597
 598 /* Create a DIMM object under specifed memory controller device */
 599 static int edac_create_dimm_object(struct mem_ctl_info *mci,
 600                                    struct dimm_info *dimm,
 601                                    int index)
 602 {
 603         int err;
 604         dimm->mci = mci;
 605
 606         dimm->dev.type = &dimm_attr_type;
 607         dimm->dev.bus = &mci->bus;
 608         device_initialize(&dimm->dev);
 609
 610         dimm->dev.parent = &mci->dev;
 611         if (mci->mem_is_per_rank)
 612                 dev_set_name(&dimm->dev, "rank%d", index);
 613         else
 614                 dev_set_name(&dimm->dev, "dimm%d", index);
 615         dev_set_drvdata(&dimm->dev, dimm);
 616         pm_runtime_forbid(&mci->dev);
 617
 618         err =  device_add(&dimm->dev);
 619
 620         edac_dbg(0, "creating rank/dimm device %s\n", dev_name(&dimm->dev));
 621
 622         return err;
 623 }
 624
 625 /*
 626  * Memory controller device
 627  */
 628
 629 #define to_mci(k) container_of(k, struct mem_ctl_info, dev)
 630
 631 static ssize_t mci_reset_counters_store(struct device *dev,
 632                                         struct device_attribute *mattr,
 633                                         const char *data, size_t count)
 634 {
 635         struct mem_ctl_info *mci = to_mci(dev);
 636         int cnt, row, chan, i;
 637         mci->ue_mc = 0;
 638         mci->ce_mc = 0;
 639         mci->ue_noinfo_count = 0;
 640         mci->ce_noinfo_count = 0;
 641
 642         for (row = 0; row < mci->nr_csrows; row++) {
 643                 struct csrow_info *ri = mci->csrows[row];
 644
 645                 ri->ue_count = 0;
 646                 ri->ce_count = 0;
 647
 648                 for (chan = 0; chan < ri->nr_channels; chan++)
 649                         ri->channels[chan]->ce_count = 0;
 650         }
 651
 652         cnt = 1;
 653         for (i = 0; i < mci->n_layers; i++) {
 654                 cnt *= mci->layers[i].size;
 655                 memset(mci->ce_per_layer[i], 0, cnt * sizeof(u32));
 656                 memset(mci->ue_per_layer[i], 0, cnt * sizeof(u32));
 657         }
 658
 659         mci->start_time = jiffies;
 660         return count;
 661 }
 662
 663 /* Memory scrubbing interface:
 664  *
 665  * A MC driver can limit the scrubbing bandwidth based on the CPU type.
 666  * Therefore, ->set_sdram_scrub_rate should be made to return the actual
 667  * bandwidth that is accepted or 0 when scrubbing is to be disabled.
 668  *
 669  * Negative value still means that an error has occurred while setting
 670  * the scrub rate.
 671  */
 672 static ssize_t mci_sdram_scrub_rate_store(struct device *dev,
 673                                           struct device_attribute *mattr,
 674                                           const char *data, size_t count)
 675 {
 676         struct mem_ctl_info *mci = to_mci(dev);
 677         unsigned long bandwidth = 0;
 678         int new_bw = 0;
 679
 680         if (!mci->set_sdram_scrub_rate)
 681                 return -ENODEV;
 682
 683         if (strict_strtoul(data, 10, &bandwidth) < 0)
 684                 return -EINVAL;
 685
 686         new_bw = mci->set_sdram_scrub_rate(mci, bandwidth);
 687         if (new_bw < 0) {
 688                 edac_printk(KERN_WARNING, EDAC_MC,
 689                             "Error setting scrub rate to: %lu\n", bandwidth);
 690                 return -EINVAL;
 691         }
 692
 693         return count;
 694 }
 695
 696 /*
 697  * ->get_sdram_scrub_rate() return value semantics same as above.
 698  */
 699 static ssize_t mci_sdram_scrub_rate_show(struct device *dev,
 700                                          struct device_attribute *mattr,
 701                                          char *data)
 702 {
 703         struct mem_ctl_info *mci = to_mci(dev);
 704         int bandwidth = 0;
 705
 706         if (!mci->get_sdram_scrub_rate)
 707                 return -ENODEV;
 708
 709         bandwidth = mci->get_sdram_scrub_rate(mci);
 710         if (bandwidth < 0) {
 711                 edac_printk(KERN_DEBUG, EDAC_MC, "Error reading scrub rate\n");
 712                 return bandwidth;
 713         }
 714
 715         return sprintf(data, "%d\n", bandwidth);
 716 }
 717
 718 /* default attribute files for the MCI object */
 719 static ssize_t mci_ue_count_show(struct device *dev,
 720                                  struct device_attribute *mattr,
 721                                  char *data)
 722 {
 723         struct mem_ctl_info *mci = to_mci(dev);
 724
 725         return sprintf(data, "%d\n", mci->ue_mc);
 726 }
 727
 728 static ssize_t mci_ce_count_show(struct device *dev,
 729                                  struct device_attribute *mattr,
 730                                  char *data)
 731 {
 732         struct mem_ctl_info *mci = to_mci(dev);
 733
 734         return sprintf(data, "%d\n", mci->ce_mc);
 735 }
 736
 737 static ssize_t mci_ce_noinfo_show(struct device *dev,
 738                                   struct device_attribute *mattr,
 739                                   char *data)
 740 {
 741         struct mem_ctl_info *mci = to_mci(dev);
 742
 743         return sprintf(data, "%d\n", mci->ce_noinfo_count);
 744 }
 745
 746 static ssize_t mci_ue_noinfo_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_noinfo_count);
 753 }
 754
 755 static ssize_t mci_seconds_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, "%ld\n", (jiffies - mci->start_time) / HZ);
 762 }
 763
 764 static ssize_t mci_ctl_name_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, "%s\n", mci->ctl_name);
 771 }
 772
 773 static ssize_t mci_size_mb_show(struct device *dev,
 774                                 struct device_attribute *mattr,
 775                                 char *data)
 776 {
 777         struct mem_ctl_info *mci = to_mci(dev);
 778         int total_pages = 0, csrow_idx, j;
 779
 780         for (csrow_idx = 0; csrow_idx < mci->nr_csrows; csrow_idx++) {
 781                 struct csrow_info *csrow = mci->csrows[csrow_idx];
 782
 783                 if (csrow->mci->csbased) {
 784                         total_pages += csrow->nr_pages;
 785                 } else {
 786                         for (j = 0; j < csrow->nr_channels; j++) {
 787                                 struct dimm_info *dimm = csrow->channels[j]->dimm;
 788
 789                                 total_pages += dimm->nr_pages;
 790                         }
 791                 }
 792         }
 793
 794         return sprintf(data, "%u\n", PAGES_TO_MiB(total_pages));
 795 }
 796
 797 static ssize_t mci_max_location_show(struct device *dev,
 798                                      struct device_attribute *mattr,
 799                                      char *data)
 800 {
 801         struct mem_ctl_info *mci = to_mci(dev);
 802         int i;
 803         char *p = data;
 804
 805         for (i = 0; i < mci->n_layers; i++) {
 806                 p += sprintf(p, "%s %d ",
 807                              edac_layer_name[mci->layers[i].type],
 808                              mci->layers[i].size - 1);
 809         }
 810
 811         return p - data;
 812 }
 813
 814 #ifdef CONFIG_EDAC_DEBUG
 815 static ssize_t edac_fake_inject_write(struct file *file,
 816                                       const char __user *data,
 817                                       size_t count, loff_t *ppos)
 818 {
 819         struct device *dev = file->private_data;
 820         struct mem_ctl_info *mci = to_mci(dev);
 821         static enum hw_event_mc_err_type type;
 822         u16 errcount = mci->fake_inject_count;
 823
 824         if (!errcount)
 825                 errcount = 1;
 826
 827         type = mci->fake_inject_ue ? HW_EVENT_ERR_UNCORRECTED
 828                                    : HW_EVENT_ERR_CORRECTED;
 829
 830         printk(KERN_DEBUG
 831                "Generating %d %s fake error%s to %d.%d.%d to test core handling. NOTE: this won't test the driver-specific decoding logic.\n",
 832                 errcount,
 833                 (type == HW_EVENT_ERR_UNCORRECTED) ? "UE" : "CE",
 834                 errcount > 1 ? "s" : "",
 835                 mci->fake_inject_layer[0],
 836                 mci->fake_inject_layer[1],
 837                 mci->fake_inject_layer[2]
 838                );
 839         edac_mc_handle_error(type, mci, errcount, 0, 0, 0,
 840                              mci->fake_inject_layer[0],
 841                              mci->fake_inject_layer[1],
 842                              mci->fake_inject_layer[2],
 843                              "FAKE ERROR", "for EDAC testing only");
 844
 845         return count;
 846 }
 847
 848 static const struct file_operations debug_fake_inject_fops = {
 849         .open = simple_open,
 850         .write = edac_fake_inject_write,
 851         .llseek = generic_file_llseek,
 852 };
 853 #endif
 854
 855 /* default Control file */
 856 DEVICE_ATTR(reset_counters, S_IWUSR, NULL, mci_reset_counters_store);
 857
 858 /* default Attribute files */
 859 DEVICE_ATTR(mc_name, S_IRUGO, mci_ctl_name_show, NULL);
 860 DEVICE_ATTR(size_mb, S_IRUGO, mci_size_mb_show, NULL);
 861 DEVICE_ATTR(seconds_since_reset, S_IRUGO, mci_seconds_show, NULL);
 862 DEVICE_ATTR(ue_noinfo_count, S_IRUGO, mci_ue_noinfo_show, NULL);
 863 DEVICE_ATTR(ce_noinfo_count, S_IRUGO, mci_ce_noinfo_show, NULL);
 864 DEVICE_ATTR(ue_count, S_IRUGO, mci_ue_count_show, NULL);
 865 DEVICE_ATTR(ce_count, S_IRUGO, mci_ce_count_show, NULL);
 866 DEVICE_ATTR(max_location, S_IRUGO, mci_max_location_show, NULL);
 867
 868 /* memory scrubber attribute file */
 869 DEVICE_ATTR(sdram_scrub_rate, S_IRUGO | S_IWUSR, mci_sdram_scrub_rate_show,
 870         mci_sdram_scrub_rate_store);
 871
 872 static struct attribute *mci_attrs[] = {
 873         &dev_attr_reset_counters.attr,
 874         &dev_attr_mc_name.attr,
 875         &dev_attr_size_mb.attr,
 876         &dev_attr_seconds_since_reset.attr,
 877         &dev_attr_ue_noinfo_count.attr,
 878         &dev_attr_ce_noinfo_count.attr,
 879         &dev_attr_ue_count.attr,
 880         &dev_attr_ce_count.attr,
 881         &dev_attr_sdram_scrub_rate.attr,
 882         &dev_attr_max_location.attr,
 883         NULL
 884 };
 885
 886 static struct attribute_group mci_attr_grp = {
 887         .attrs  = mci_attrs,
 888 };
 889
 890 static const struct attribute_group *mci_attr_groups[] = {
 891         &mci_attr_grp,
 892         NULL
 893 };
 894
 895 static void mci_attr_release(struct device *dev)
 896 {
 897         struct mem_ctl_info *mci = container_of(dev, struct mem_ctl_info, dev);
 898
 899         edac_dbg(1, "Releasing csrow device %s\n", dev_name(dev));
 900         kfree(mci);
 901 }
 902
 903 static struct device_type mci_attr_type = {
 904         .groups         = mci_attr_groups,
 905         .release        = mci_attr_release,
 906 };
 907
 908 #ifdef CONFIG_EDAC_DEBUG
 909 static struct dentry *edac_debugfs;
 910
 911 int __init edac_debugfs_init(void)
 912 {
 913         edac_debugfs = debugfs_create_dir("edac", NULL);
 914         if (IS_ERR(edac_debugfs)) {
 915                 edac_debugfs = NULL;
 916                 return -ENOMEM;
 917         }
 918         return 0;
 919 }
 920
 921 void __exit edac_debugfs_exit(void)
 922 {
 923         debugfs_remove(edac_debugfs);
 924 }
 925
 926 int edac_create_debug_nodes(struct mem_ctl_info *mci)
 927 {
 928         struct dentry *d, *parent;
 929         char name[80];
 930         int i;
 931
 932         if (!edac_debugfs)
 933                 return -ENODEV;
 934
 935         d = debugfs_create_dir(mci->dev.kobj.name, edac_debugfs);
 936         if (!d)
 937                 return -ENOMEM;
 938         parent = d;
 939
 940         for (i = 0; i < mci->n_layers; i++) {
 941                 sprintf(name, "fake_inject_%s",
 942                              edac_layer_name[mci->layers[i].type]);
 943                 d = debugfs_create_u8(name, S_IRUGO | S_IWUSR, parent,
 944                                       &mci->fake_inject_layer[i]);
 945                 if (!d)
 946                         goto nomem;
 947         }
 948
 949         d = debugfs_create_bool("fake_inject_ue", S_IRUGO | S_IWUSR, parent,
 950                                 &mci->fake_inject_ue);
 951         if (!d)
 952                 goto nomem;
 953
 954         d = debugfs_create_u16("fake_inject_count", S_IRUGO | S_IWUSR, parent,
 955                                 &mci->fake_inject_count);
 956         if (!d)
 957                 goto nomem;
 958
 959         d = debugfs_create_file("fake_inject", S_IWUSR, parent,
 960                                 &mci->dev,
 961                                 &debug_fake_inject_fops);
 962         if (!d)
 963                 goto nomem;
 964
 965         mci->debugfs = parent;
 966         return 0;
 967 nomem:
 968         debugfs_remove(mci->debugfs);
 969         return -ENOMEM;
 970 }
 971 #endif
 972
 973 /*
 974  * Create a new Memory Controller kobject instance,
 975  *      mc<id> under the 'mc' directory
 976  *
 977  * Return:
 978  *      0       Success
 979  *      !0      Failure
 980  */
 981 int edac_create_sysfs_mci_device(struct mem_ctl_info *mci)
 982 {
 983         int i, err;
 984
 985         /*
 986          * The memory controller needs its own bus, in order to avoid
 987          * namespace conflicts at /sys/bus/edac.
 988          */
 989         mci->bus.name = kasprintf(GFP_KERNEL, "mc%d", mci->mc_idx);
 990         if (!mci->bus.name)
 991                 return -ENOMEM;
 992         edac_dbg(0, "creating bus %s\n", mci->bus.name);
 993         err = bus_register(&mci->bus);
 994         if (err < 0)
 995                 return err;
 996
 997         /* get the /sys/devices/system/edac subsys reference */
 998         mci->dev.type = &mci_attr_type;
 999         device_initialize(&mci->dev);
1000
1001         mci->dev.parent = mci_pdev;
1002         mci->dev.bus = &mci->bus;
1003         dev_set_name(&mci->dev, "mc%d", mci->mc_idx);
1004         dev_set_drvdata(&mci->dev, mci);
1005         pm_runtime_forbid(&mci->dev);
1006
1007         edac_dbg(0, "creating device %s\n", dev_name(&mci->dev));
1008         err = device_add(&mci->dev);
1009         if (err < 0) {
1010                 bus_unregister(&mci->bus);
1011                 kfree(mci->bus.name);
1012                 return err;
1013         }
1014
1015         /*
1016          * Create the dimm/rank devices
1017          */
1018         for (i = 0; i < mci->tot_dimms; i++) {
1019                 struct dimm_info *dimm = mci->dimms[i];
1020                 /* Only expose populated DIMMs */
1021                 if (dimm->nr_pages == 0)
1022                         continue;
1023 #ifdef CONFIG_EDAC_DEBUG
1024                 edac_dbg(1, "creating dimm%d, located at ", i);
1025                 if (edac_debug_level >= 1) {
1026                         int lay;
1027                         for (lay = 0; lay < mci->n_layers; lay++)
1028                                 printk(KERN_CONT "%s %d ",
1029                                         edac_layer_name[mci->layers[lay].type],
1030                                         dimm->location[lay]);
1031                         printk(KERN_CONT "\n");
1032                 }
1033 #endif
1034                 err = edac_create_dimm_object(mci, dimm, i);
1035                 if (err) {
1036                         edac_dbg(1, "failure: create dimm %d obj\n", i);
1037                         goto fail;
1038                 }
1039         }
1040
1041 #ifdef CONFIG_EDAC_LEGACY_SYSFS
1042         err = edac_create_csrow_objects(mci);
1043         if (err < 0)
1044                 goto fail;
1045 #endif
1046
1047 #ifdef CONFIG_EDAC_DEBUG
1048         edac_create_debug_nodes(mci);
1049 #endif
1050         return 0;
1051
1052 fail:
1053         for (i--; i >= 0; i--) {
1054                 struct dimm_info *dimm = mci->dimms[i];
1055                 if (dimm->nr_pages == 0)
1056                         continue;
1057                 device_unregister(&dimm->dev);
1058         }
1059         device_unregister(&mci->dev);
1060         bus_unregister(&mci->bus);
1061         kfree(mci->bus.name);
1062         return err;
1063 }
1064
1065 /*
1066  * remove a Memory Controller instance
1067  */
1068 void edac_remove_sysfs_mci_device(struct mem_ctl_info *mci)
1069 {
1070         int i;
1071
1072         edac_dbg(0, "\n");
1073
1074 #ifdef CONFIG_EDAC_DEBUG
1075         debugfs_remove(mci->debugfs);
1076 #endif
1077 #ifdef CONFIG_EDAC_LEGACY_SYSFS
1078         edac_delete_csrow_objects(mci);
1079 #endif
1080
1081         for (i = 0; i < mci->tot_dimms; i++) {
1082                 struct dimm_info *dimm = mci->dimms[i];
1083                 if (dimm->nr_pages == 0)
1084                         continue;
1085                 edac_dbg(0, "removing device %s\n", dev_name(&dimm->dev));
1086                 device_unregister(&dimm->dev);
1087         }
1088 }
1089
1090 void edac_unregister_sysfs(struct mem_ctl_info *mci)
1091 {
1092         edac_dbg(1, "Unregistering device %s\n", dev_name(&mci->dev));
1093         device_unregister(&mci->dev);
1094         bus_unregister(&mci->bus);
1095         kfree(mci->bus.name);
1096 }
1097
1098 static void mc_attr_release(struct device *dev)
1099 {
1100         /*
1101          * There's no container structure here, as this is just the mci
1102          * parent device, used to create the /sys/devices/mc sysfs node.
1103          * So, there are no attributes on it.
1104          */
1105         edac_dbg(1, "Releasing device %s\n", dev_name(dev));
1106         kfree(dev);
1107 }
1108
1109 static struct device_type mc_attr_type = {
1110         .release        = mc_attr_release,
1111 };
1112 /*
1113  * Init/exit code for the module. Basically, creates/removes /sys/class/rc
1114  */
1115 int __init edac_mc_sysfs_init(void)
1116 {
1117         struct bus_type *edac_subsys;
1118         int err;
1119
1120         /* get the /sys/devices/system/edac subsys reference */
1121         edac_subsys = edac_get_sysfs_subsys();
1122         if (edac_subsys == NULL) {
1123                 edac_dbg(1, "no edac_subsys\n");
1124                 err = -EINVAL;
1125                 goto out;
1126         }
1127
1128         mci_pdev = kzalloc(sizeof(*mci_pdev), GFP_KERNEL);
1129         if (!mci_pdev) {
1130                 err = -ENOMEM;
1131                 goto out_put_sysfs;
1132         }
1133
1134         mci_pdev->bus = edac_subsys;
1135         mci_pdev->type = &mc_attr_type;
1136         device_initialize(mci_pdev);
1137         dev_set_name(mci_pdev, "mc");
1138
1139         err = device_add(mci_pdev);
1140         if (err < 0)
1141                 goto out_dev_free;
1142
1143         edac_dbg(0, "device %s created\n", dev_name(mci_pdev));
1144
1145         return 0;
1146
1147  out_dev_free:
1148         kfree(mci_pdev);
1149  out_put_sysfs:
1150         edac_put_sysfs_subsys();
1151  out:
1152         return err;
1153 }
1154
1155 void __exit edac_mc_sysfs_exit(void)
1156 {
1157         device_unregister(mci_pdev);
1158         edac_put_sysfs_subsys();
1159 }