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_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         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 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, EDAC_MC_LABEL_LEN, "%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
 244         ssize_t max_size = 0;
 245
 246         max_size = min((ssize_t) count, (ssize_t) EDAC_MC_LABEL_LEN - 1);
 247         strncpy(rank->dimm->label, data, max_size);
 248         rank->dimm->label[max_size] = '\0';
 249
 250         return max_size;
 251 }
 252
 253 /* show function for dynamic chX_ce_count attribute */
 254 static ssize_t channel_ce_count_show(struct device *dev,
 255                                      struct device_attribute *mattr, char *data)
 256 {
 257         struct csrow_info *csrow = to_csrow(dev);
 258         unsigned chan = to_channel(mattr);
 259         struct rank_info *rank = csrow->channels[chan];
 260
 261         return sprintf(data, "%u\n", rank->ce_count);
 262 }
 263
 264 /* cwrow<id>/attribute files */
 265 DEVICE_ATTR_LEGACY(size_mb, S_IRUGO, csrow_size_show, NULL);
 266 DEVICE_ATTR_LEGACY(dev_type, S_IRUGO, csrow_dev_type_show, NULL);
 267 DEVICE_ATTR_LEGACY(mem_type, S_IRUGO, csrow_mem_type_show, NULL);
 268 DEVICE_ATTR_LEGACY(edac_mode, S_IRUGO, csrow_edac_mode_show, NULL);
 269 DEVICE_ATTR_LEGACY(ue_count, S_IRUGO, csrow_ue_count_show, NULL);
 270 DEVICE_ATTR_LEGACY(ce_count, S_IRUGO, csrow_ce_count_show, NULL);
 271
 272 /* default attributes of the CSROW<id> object */
 273 static struct attribute *csrow_attrs[] = {
 274         &dev_attr_legacy_dev_type.attr,
 275         &dev_attr_legacy_mem_type.attr,
 276         &dev_attr_legacy_edac_mode.attr,
 277         &dev_attr_legacy_size_mb.attr,
 278         &dev_attr_legacy_ue_count.attr,
 279         &dev_attr_legacy_ce_count.attr,
 280         NULL,
 281 };
 282
 283 static struct attribute_group csrow_attr_grp = {
 284         .attrs  = csrow_attrs,
 285 };
 286
 287 static const struct attribute_group *csrow_attr_groups[] = {
 288         &csrow_attr_grp,
 289         NULL
 290 };
 291
 292 static void csrow_attr_release(struct device *dev)
 293 {
 294         struct csrow_info *csrow = container_of(dev, struct csrow_info, dev);
 295
 296         edac_dbg(1, "Releasing csrow device %s\n", dev_name(dev));
 297         kfree(csrow);
 298 }
 299
 300 static struct device_type csrow_attr_type = {
 301         .groups         = csrow_attr_groups,
 302         .release        = csrow_attr_release,
 303 };
 304
 305 /*
 306  * possible dynamic channel DIMM Label attribute files
 307  *
 308  */
 309
 310 #define EDAC_NR_CHANNELS        6
 311
 312 DEVICE_CHANNEL(ch0_dimm_label, S_IRUGO | S_IWUSR,
 313         channel_dimm_label_show, channel_dimm_label_store, 0);
 314 DEVICE_CHANNEL(ch1_dimm_label, S_IRUGO | S_IWUSR,
 315         channel_dimm_label_show, channel_dimm_label_store, 1);
 316 DEVICE_CHANNEL(ch2_dimm_label, S_IRUGO | S_IWUSR,
 317         channel_dimm_label_show, channel_dimm_label_store, 2);
 318 DEVICE_CHANNEL(ch3_dimm_label, S_IRUGO | S_IWUSR,
 319         channel_dimm_label_show, channel_dimm_label_store, 3);
 320 DEVICE_CHANNEL(ch4_dimm_label, S_IRUGO | S_IWUSR,
 321         channel_dimm_label_show, channel_dimm_label_store, 4);
 322 DEVICE_CHANNEL(ch5_dimm_label, S_IRUGO | S_IWUSR,
 323         channel_dimm_label_show, channel_dimm_label_store, 5);
 324
 325 /* Total possible dynamic DIMM Label attribute file table */
 326 static struct device_attribute *dynamic_csrow_dimm_attr[] = {
 327         &dev_attr_legacy_ch0_dimm_label.attr,
 328         &dev_attr_legacy_ch1_dimm_label.attr,
 329         &dev_attr_legacy_ch2_dimm_label.attr,
 330         &dev_attr_legacy_ch3_dimm_label.attr,
 331         &dev_attr_legacy_ch4_dimm_label.attr,
 332         &dev_attr_legacy_ch5_dimm_label.attr
 333 };
 334
 335 /* possible dynamic channel ce_count attribute files */
 336 DEVICE_CHANNEL(ch0_ce_count, S_IRUGO,
 337                    channel_ce_count_show, NULL, 0);
 338 DEVICE_CHANNEL(ch1_ce_count, S_IRUGO,
 339                    channel_ce_count_show, NULL, 1);
 340 DEVICE_CHANNEL(ch2_ce_count, S_IRUGO,
 341                    channel_ce_count_show, NULL, 2);
 342 DEVICE_CHANNEL(ch3_ce_count, S_IRUGO,
 343                    channel_ce_count_show, NULL, 3);
 344 DEVICE_CHANNEL(ch4_ce_count, S_IRUGO,
 345                    channel_ce_count_show, NULL, 4);
 346 DEVICE_CHANNEL(ch5_ce_count, S_IRUGO,
 347                    channel_ce_count_show, NULL, 5);
 348
 349 /* Total possible dynamic ce_count attribute file table */
 350 static struct device_attribute *dynamic_csrow_ce_count_attr[] = {
 351         &dev_attr_legacy_ch0_ce_count.attr,
 352         &dev_attr_legacy_ch1_ce_count.attr,
 353         &dev_attr_legacy_ch2_ce_count.attr,
 354         &dev_attr_legacy_ch3_ce_count.attr,
 355         &dev_attr_legacy_ch4_ce_count.attr,
 356         &dev_attr_legacy_ch5_ce_count.attr
 357 };
 358
 359 static inline int nr_pages_per_csrow(struct csrow_info *csrow)
 360 {
 361         int chan, nr_pages = 0;
 362
 363         for (chan = 0; chan < csrow->nr_channels; chan++)
 364                 nr_pages += csrow->channels[chan]->dimm->nr_pages;
 365
 366         return nr_pages;
 367 }
 368
 369 /* Create a CSROW object under specifed edac_mc_device */
 370 static int edac_create_csrow_object(struct mem_ctl_info *mci,
 371                                     struct csrow_info *csrow, int index)
 372 {
 373         int err, chan;
 374
 375         if (csrow->nr_channels > EDAC_NR_CHANNELS)
 376                 return -ENODEV;
 377
 378         csrow->dev.type = &csrow_attr_type;
 379         csrow->dev.bus = mci->bus;
 380         device_initialize(&csrow->dev);
 381         csrow->dev.parent = &mci->dev;
 382         csrow->mci = mci;
 383         dev_set_name(&csrow->dev, "csrow%d", index);
 384         dev_set_drvdata(&csrow->dev, csrow);
 385
 386         edac_dbg(0, "creating (virtual) csrow node %s\n",
 387                  dev_name(&csrow->dev));
 388
 389         err = device_add(&csrow->dev);
 390         if (err < 0)
 391                 return err;
 392
 393         for (chan = 0; chan < csrow->nr_channels; chan++) {
 394                 /* Only expose populated DIMMs */
 395                 if (!csrow->channels[chan]->dimm->nr_pages)
 396                         continue;
 397                 err = device_create_file(&csrow->dev,
 398                                          dynamic_csrow_dimm_attr[chan]);
 399                 if (err < 0)
 400                         goto error;
 401                 err = device_create_file(&csrow->dev,
 402                                          dynamic_csrow_ce_count_attr[chan]);
 403                 if (err < 0) {
 404                         device_remove_file(&csrow->dev,
 405                                            dynamic_csrow_dimm_attr[chan]);
 406                         goto error;
 407                 }
 408         }
 409
 410         return 0;
 411
 412 error:
 413         for (--chan; chan >= 0; chan--) {
 414                 device_remove_file(&csrow->dev,
 415                                         dynamic_csrow_dimm_attr[chan]);
 416                 device_remove_file(&csrow->dev,
 417                                            dynamic_csrow_ce_count_attr[chan]);
 418         }
 419         put_device(&csrow->dev);
 420
 421         return err;
 422 }
 423
 424 /* Create a CSROW object under specifed edac_mc_device */
 425 static int edac_create_csrow_objects(struct mem_ctl_info *mci)
 426 {
 427         int err, i, chan;
 428         struct csrow_info *csrow;
 429
 430         for (i = 0; i < mci->nr_csrows; i++) {
 431                 csrow = mci->csrows[i];
 432                 if (!nr_pages_per_csrow(csrow))
 433                         continue;
 434                 err = edac_create_csrow_object(mci, mci->csrows[i], i);
 435                 if (err < 0) {
 436                         edac_dbg(1,
 437                                  "failure: create csrow objects for csrow %d\n",
 438                                  i);
 439                         goto error;
 440                 }
 441         }
 442         return 0;
 443
 444 error:
 445         for (--i; i >= 0; i--) {
 446                 csrow = mci->csrows[i];
 447                 if (!nr_pages_per_csrow(csrow))
 448                         continue;
 449                 for (chan = csrow->nr_channels - 1; chan >= 0; chan--) {
 450                         if (!csrow->channels[chan]->dimm->nr_pages)
 451                                 continue;
 452                         device_remove_file(&csrow->dev,
 453                                                 dynamic_csrow_dimm_attr[chan]);
 454                         device_remove_file(&csrow->dev,
 455                                                 dynamic_csrow_ce_count_attr[chan]);
 456                 }
 457                 put_device(&mci->csrows[i]->dev);
 458         }
 459
 460         return err;
 461 }
 462
 463 static void edac_delete_csrow_objects(struct mem_ctl_info *mci)
 464 {
 465         int i, chan;
 466         struct csrow_info *csrow;
 467
 468         for (i = mci->nr_csrows - 1; i >= 0; i--) {
 469                 csrow = mci->csrows[i];
 470                 if (!nr_pages_per_csrow(csrow))
 471                         continue;
 472                 for (chan = csrow->nr_channels - 1; chan >= 0; chan--) {
 473                         if (!csrow->channels[chan]->dimm->nr_pages)
 474                                 continue;
 475                         edac_dbg(1, "Removing csrow %d channel %d sysfs nodes\n",
 476                                  i, chan);
 477                         device_remove_file(&csrow->dev,
 478                                                 dynamic_csrow_dimm_attr[chan]);
 479                         device_remove_file(&csrow->dev,
 480                                                 dynamic_csrow_ce_count_attr[chan]);
 481                 }
 482                 device_unregister(&mci->csrows[i]->dev);
 483         }
 484 }
 485 #endif
 486
 487 /*
 488  * Per-dimm (or per-rank) devices
 489  */
 490
 491 #define to_dimm(k) container_of(k, struct dimm_info, dev)
 492
 493 /* show/store functions for DIMM Label attributes */
 494 static ssize_t dimmdev_location_show(struct device *dev,
 495                                      struct device_attribute *mattr, char *data)
 496 {
 497         struct dimm_info *dimm = to_dimm(dev);
 498
 499         return edac_dimm_info_location(dimm, data, PAGE_SIZE);
 500 }
 501
 502 static ssize_t dimmdev_label_show(struct device *dev,
 503                                   struct device_attribute *mattr, char *data)
 504 {
 505         struct dimm_info *dimm = to_dimm(dev);
 506
 507         /* if field has not been initialized, there is nothing to send */
 508         if (!dimm->label[0])
 509                 return 0;
 510
 511         return snprintf(data, EDAC_MC_LABEL_LEN, "%s\n", dimm->label);
 512 }
 513
 514 static ssize_t dimmdev_label_store(struct device *dev,
 515                                    struct device_attribute *mattr,
 516                                    const char *data,
 517                                    size_t count)
 518 {
 519         struct dimm_info *dimm = to_dimm(dev);
 520
 521         ssize_t max_size = 0;
 522
 523         max_size = min((ssize_t) count, (ssize_t) EDAC_MC_LABEL_LEN - 1);
 524         strncpy(dimm->label, data, max_size);
 525         dimm->label[max_size] = '\0';
 526
 527         return max_size;
 528 }
 529
 530 static ssize_t dimmdev_size_show(struct device *dev,
 531                                  struct device_attribute *mattr, char *data)
 532 {
 533         struct dimm_info *dimm = to_dimm(dev);
 534
 535         return sprintf(data, "%u\n", PAGES_TO_MiB(dimm->nr_pages));
 536 }
 537
 538 static ssize_t dimmdev_mem_type_show(struct device *dev,
 539                                      struct device_attribute *mattr, char *data)
 540 {
 541         struct dimm_info *dimm = to_dimm(dev);
 542
 543         return sprintf(data, "%s\n", mem_types[dimm->mtype]);
 544 }
 545
 546 static ssize_t dimmdev_dev_type_show(struct device *dev,
 547                                      struct device_attribute *mattr, char *data)
 548 {
 549         struct dimm_info *dimm = to_dimm(dev);
 550
 551         return sprintf(data, "%s\n", dev_types[dimm->dtype]);
 552 }
 553
 554 static ssize_t dimmdev_edac_mode_show(struct device *dev,
 555                                       struct device_attribute *mattr,
 556                                       char *data)
 557 {
 558         struct dimm_info *dimm = to_dimm(dev);
 559
 560         return sprintf(data, "%s\n", edac_caps[dimm->edac_mode]);
 561 }
 562
 563 /* dimm/rank attribute files */
 564 static DEVICE_ATTR(dimm_label, S_IRUGO | S_IWUSR,
 565                    dimmdev_label_show, dimmdev_label_store);
 566 static DEVICE_ATTR(dimm_location, S_IRUGO, dimmdev_location_show, NULL);
 567 static DEVICE_ATTR(size, S_IRUGO, dimmdev_size_show, NULL);
 568 static DEVICE_ATTR(dimm_mem_type, S_IRUGO, dimmdev_mem_type_show, NULL);
 569 static DEVICE_ATTR(dimm_dev_type, S_IRUGO, dimmdev_dev_type_show, NULL);
 570 static DEVICE_ATTR(dimm_edac_mode, S_IRUGO, dimmdev_edac_mode_show, NULL);
 571
 572 /* attributes of the dimm<id>/rank<id> object */
 573 static struct attribute *dimm_attrs[] = {
 574         &dev_attr_dimm_label.attr,
 575         &dev_attr_dimm_location.attr,
 576         &dev_attr_size.attr,
 577         &dev_attr_dimm_mem_type.attr,
 578         &dev_attr_dimm_dev_type.attr,
 579         &dev_attr_dimm_edac_mode.attr,
 580         NULL,
 581 };
 582
 583 static struct attribute_group dimm_attr_grp = {
 584         .attrs  = dimm_attrs,
 585 };
 586
 587 static const struct attribute_group *dimm_attr_groups[] = {
 588         &dimm_attr_grp,
 589         NULL
 590 };
 591
 592 static void dimm_attr_release(struct device *dev)
 593 {
 594         struct dimm_info *dimm = container_of(dev, struct dimm_info, dev);
 595
 596         edac_dbg(1, "Releasing dimm device %s\n", dev_name(dev));
 597         kfree(dimm);
 598 }
 599
 600 static struct device_type dimm_attr_type = {
 601         .groups         = dimm_attr_groups,
 602         .release        = dimm_attr_release,
 603 };
 604
 605 /* Create a DIMM object under specifed memory controller device */
 606 static int edac_create_dimm_object(struct mem_ctl_info *mci,
 607                                    struct dimm_info *dimm,
 608                                    int index)
 609 {
 610         int err;
 611         dimm->mci = mci;
 612
 613         dimm->dev.type = &dimm_attr_type;
 614         dimm->dev.bus = mci->bus;
 615         device_initialize(&dimm->dev);
 616
 617         dimm->dev.parent = &mci->dev;
 618         if (mci->csbased)
 619                 dev_set_name(&dimm->dev, "rank%d", index);
 620         else
 621                 dev_set_name(&dimm->dev, "dimm%d", index);
 622         dev_set_drvdata(&dimm->dev, dimm);
 623         pm_runtime_forbid(&mci->dev);
 624
 625         err =  device_add(&dimm->dev);
 626
 627         edac_dbg(0, "creating rank/dimm device %s\n", dev_name(&dimm->dev));
 628
 629         return err;
 630 }
 631
 632 /*
 633  * Memory controller device
 634  */
 635
 636 #define to_mci(k) container_of(k, struct mem_ctl_info, dev)
 637
 638 static ssize_t mci_reset_counters_store(struct device *dev,
 639                                         struct device_attribute *mattr,
 640                                         const char *data, size_t count)
 641 {
 642         struct mem_ctl_info *mci = to_mci(dev);
 643         int cnt, row, chan, i;
 644         mci->ue_mc = 0;
 645         mci->ce_mc = 0;
 646         mci->ue_noinfo_count = 0;
 647         mci->ce_noinfo_count = 0;
 648
 649         for (row = 0; row < mci->nr_csrows; row++) {
 650                 struct csrow_info *ri = mci->csrows[row];
 651
 652                 ri->ue_count = 0;
 653                 ri->ce_count = 0;
 654
 655                 for (chan = 0; chan < ri->nr_channels; chan++)
 656                         ri->channels[chan]->ce_count = 0;
 657         }
 658
 659         cnt = 1;
 660         for (i = 0; i < mci->n_layers; i++) {
 661                 cnt *= mci->layers[i].size;
 662                 memset(mci->ce_per_layer[i], 0, cnt * sizeof(u32));
 663                 memset(mci->ue_per_layer[i], 0, cnt * sizeof(u32));
 664         }
 665
 666         mci->start_time = jiffies;
 667         return count;
 668 }
 669
 670 /* Memory scrubbing interface:
 671  *
 672  * A MC driver can limit the scrubbing bandwidth based on the CPU type.
 673  * Therefore, ->set_sdram_scrub_rate should be made to return the actual
 674  * bandwidth that is accepted or 0 when scrubbing is to be disabled.
 675  *
 676  * Negative value still means that an error has occurred while setting
 677  * the scrub rate.
 678  */
 679 static ssize_t mci_sdram_scrub_rate_store(struct device *dev,
 680                                           struct device_attribute *mattr,
 681                                           const char *data, size_t count)
 682 {
 683         struct mem_ctl_info *mci = to_mci(dev);
 684         unsigned long bandwidth = 0;
 685         int new_bw = 0;
 686
 687         if (kstrtoul(data, 10, &bandwidth) < 0)
 688                 return -EINVAL;
 689
 690         new_bw = mci->set_sdram_scrub_rate(mci, bandwidth);
 691         if (new_bw < 0) {
 692                 edac_printk(KERN_WARNING, EDAC_MC,
 693                             "Error setting scrub rate to: %lu\n", bandwidth);
 694                 return -EINVAL;
 695         }
 696
 697         return count;
 698 }
 699
 700 /*
 701  * ->get_sdram_scrub_rate() return value semantics same as above.
 702  */
 703 static ssize_t mci_sdram_scrub_rate_show(struct device *dev,
 704                                          struct device_attribute *mattr,
 705                                          char *data)
 706 {
 707         struct mem_ctl_info *mci = to_mci(dev);
 708         int bandwidth = 0;
 709
 710         bandwidth = mci->get_sdram_scrub_rate(mci);
 711         if (bandwidth < 0) {
 712                 edac_printk(KERN_DEBUG, EDAC_MC, "Error reading scrub rate\n");
 713                 return bandwidth;
 714         }
 715
 716         return sprintf(data, "%d\n", bandwidth);
 717 }
 718
 719 /* default attribute files for the MCI object */
 720 static ssize_t mci_ue_count_show(struct device *dev,
 721                                  struct device_attribute *mattr,
 722                                  char *data)
 723 {
 724         struct mem_ctl_info *mci = to_mci(dev);
 725
 726         return sprintf(data, "%d\n", mci->ue_mc);
 727 }
 728
 729 static ssize_t mci_ce_count_show(struct device *dev,
 730                                  struct device_attribute *mattr,
 731                                  char *data)
 732 {
 733         struct mem_ctl_info *mci = to_mci(dev);
 734
 735         return sprintf(data, "%d\n", mci->ce_mc);
 736 }
 737
 738 static ssize_t mci_ce_noinfo_show(struct device *dev,
 739                                   struct device_attribute *mattr,
 740                                   char *data)
 741 {
 742         struct mem_ctl_info *mci = to_mci(dev);
 743
 744         return sprintf(data, "%d\n", mci->ce_noinfo_count);
 745 }
 746
 747 static ssize_t mci_ue_noinfo_show(struct device *dev,
 748                                   struct device_attribute *mattr,
 749                                   char *data)
 750 {
 751         struct mem_ctl_info *mci = to_mci(dev);
 752
 753         return sprintf(data, "%d\n", mci->ue_noinfo_count);
 754 }
 755
 756 static ssize_t mci_seconds_show(struct device *dev,
 757                                 struct device_attribute *mattr,
 758                                 char *data)
 759 {
 760         struct mem_ctl_info *mci = to_mci(dev);
 761
 762         return sprintf(data, "%ld\n", (jiffies - mci->start_time) / HZ);
 763 }
 764
 765 static ssize_t mci_ctl_name_show(struct device *dev,
 766                                  struct device_attribute *mattr,
 767                                  char *data)
 768 {
 769         struct mem_ctl_info *mci = to_mci(dev);
 770
 771         return sprintf(data, "%s\n", mci->ctl_name);
 772 }
 773
 774 static ssize_t mci_size_mb_show(struct device *dev,
 775                                 struct device_attribute *mattr,
 776                                 char *data)
 777 {
 778         struct mem_ctl_info *mci = to_mci(dev);
 779         int total_pages = 0, csrow_idx, j;
 780
 781         for (csrow_idx = 0; csrow_idx < mci->nr_csrows; csrow_idx++) {
 782                 struct csrow_info *csrow = mci->csrows[csrow_idx];
 783
 784                 for (j = 0; j < csrow->nr_channels; j++) {
 785                         struct dimm_info *dimm = csrow->channels[j]->dimm;
 786
 787                         total_pages += dimm->nr_pages;
 788                 }
 789         }
 790
 791         return sprintf(data, "%u\n", PAGES_TO_MiB(total_pages));
 792 }
 793
 794 static ssize_t mci_max_location_show(struct device *dev,
 795                                      struct device_attribute *mattr,
 796                                      char *data)
 797 {
 798         struct mem_ctl_info *mci = to_mci(dev);
 799         int i;
 800         char *p = data;
 801
 802         for (i = 0; i < mci->n_layers; i++) {
 803                 p += sprintf(p, "%s %d ",
 804                              edac_layer_name[mci->layers[i].type],
 805                              mci->layers[i].size - 1);
 806         }
 807
 808         return p - data;
 809 }
 810
 811 #ifdef CONFIG_EDAC_DEBUG
 812 static ssize_t edac_fake_inject_write(struct file *file,
 813                                       const char __user *data,
 814                                       size_t count, loff_t *ppos)
 815 {
 816         struct device *dev = file->private_data;
 817         struct mem_ctl_info *mci = to_mci(dev);
 818         static enum hw_event_mc_err_type type;
 819         u16 errcount = mci->fake_inject_count;
 820
 821         if (!errcount)
 822                 errcount = 1;
 823
 824         type = mci->fake_inject_ue ? HW_EVENT_ERR_UNCORRECTED
 825                                    : HW_EVENT_ERR_CORRECTED;
 826
 827         printk(KERN_DEBUG
 828                "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",
 829                 errcount,
 830                 (type == HW_EVENT_ERR_UNCORRECTED) ? "UE" : "CE",
 831                 errcount > 1 ? "s" : "",
 832                 mci->fake_inject_layer[0],
 833                 mci->fake_inject_layer[1],
 834                 mci->fake_inject_layer[2]
 835                );
 836         edac_mc_handle_error(type, mci, errcount, 0, 0, 0,
 837                              mci->fake_inject_layer[0],
 838                              mci->fake_inject_layer[1],
 839                              mci->fake_inject_layer[2],
 840                              "FAKE ERROR", "for EDAC testing only");
 841
 842         return count;
 843 }
 844
 845 static const struct file_operations debug_fake_inject_fops = {
 846         .open = simple_open,
 847         .write = edac_fake_inject_write,
 848         .llseek = generic_file_llseek,
 849 };
 850 #endif
 851
 852 /* default Control file */
 853 static DEVICE_ATTR(reset_counters, S_IWUSR, NULL, mci_reset_counters_store);
 854
 855 /* default Attribute files */
 856 static DEVICE_ATTR(mc_name, S_IRUGO, mci_ctl_name_show, NULL);
 857 static DEVICE_ATTR(size_mb, S_IRUGO, mci_size_mb_show, NULL);
 858 static DEVICE_ATTR(seconds_since_reset, S_IRUGO, mci_seconds_show, NULL);
 859 static DEVICE_ATTR(ue_noinfo_count, S_IRUGO, mci_ue_noinfo_show, NULL);
 860 static DEVICE_ATTR(ce_noinfo_count, S_IRUGO, mci_ce_noinfo_show, NULL);
 861 static DEVICE_ATTR(ue_count, S_IRUGO, mci_ue_count_show, NULL);
 862 static DEVICE_ATTR(ce_count, S_IRUGO, mci_ce_count_show, NULL);
 863 static DEVICE_ATTR(max_location, S_IRUGO, mci_max_location_show, NULL);
 864
 865 /* memory scrubber attribute file */
 866 static DEVICE_ATTR(sdram_scrub_rate, 0, NULL, NULL);
 867
 868 static struct attribute *mci_attrs[] = {
 869         &dev_attr_reset_counters.attr,
 870         &dev_attr_mc_name.attr,
 871         &dev_attr_size_mb.attr,
 872         &dev_attr_seconds_since_reset.attr,
 873         &dev_attr_ue_noinfo_count.attr,
 874         &dev_attr_ce_noinfo_count.attr,
 875         &dev_attr_ue_count.attr,
 876         &dev_attr_ce_count.attr,
 877         &dev_attr_max_location.attr,
 878         NULL
 879 };
 880
 881 static struct attribute_group mci_attr_grp = {
 882         .attrs  = mci_attrs,
 883 };
 884
 885 static const struct attribute_group *mci_attr_groups[] = {
 886         &mci_attr_grp,
 887         NULL
 888 };
 889
 890 static void mci_attr_release(struct device *dev)
 891 {
 892         struct mem_ctl_info *mci = container_of(dev, struct mem_ctl_info, dev);
 893
 894         edac_dbg(1, "Releasing csrow device %s\n", dev_name(dev));
 895         kfree(mci);
 896 }
 897
 898 static struct device_type mci_attr_type = {
 899         .groups         = mci_attr_groups,
 900         .release        = mci_attr_release,
 901 };
 902
 903 #ifdef CONFIG_EDAC_DEBUG
 904 static struct dentry *edac_debugfs;
 905
 906 int __init edac_debugfs_init(void)
 907 {
 908         edac_debugfs = debugfs_create_dir("edac", NULL);
 909         if (IS_ERR(edac_debugfs)) {
 910                 edac_debugfs = NULL;
 911                 return -ENOMEM;
 912         }
 913         return 0;
 914 }
 915
 916 void __exit edac_debugfs_exit(void)
 917 {
 918         debugfs_remove(edac_debugfs);
 919 }
 920
 921 static int edac_create_debug_nodes(struct mem_ctl_info *mci)
 922 {
 923         struct dentry *d, *parent;
 924         char name[80];
 925         int i;
 926
 927         if (!edac_debugfs)
 928                 return -ENODEV;
 929
 930         d = debugfs_create_dir(mci->dev.kobj.name, edac_debugfs);
 931         if (!d)
 932                 return -ENOMEM;
 933         parent = d;
 934
 935         for (i = 0; i < mci->n_layers; i++) {
 936                 sprintf(name, "fake_inject_%s",
 937                              edac_layer_name[mci->layers[i].type]);
 938                 d = debugfs_create_u8(name, S_IRUGO | S_IWUSR, parent,
 939                                       &mci->fake_inject_layer[i]);
 940                 if (!d)
 941                         goto nomem;
 942         }
 943
 944         d = debugfs_create_bool("fake_inject_ue", S_IRUGO | S_IWUSR, parent,
 945                                 &mci->fake_inject_ue);
 946         if (!d)
 947                 goto nomem;
 948
 949         d = debugfs_create_u16("fake_inject_count", S_IRUGO | S_IWUSR, parent,
 950                                 &mci->fake_inject_count);
 951         if (!d)
 952                 goto nomem;
 953
 954         d = debugfs_create_file("fake_inject", S_IWUSR, parent,
 955                                 &mci->dev,
 956                                 &debug_fake_inject_fops);
 957         if (!d)
 958                 goto nomem;
 959
 960         mci->debugfs = parent;
 961         return 0;
 962 nomem:
 963         debugfs_remove(mci->debugfs);
 964         return -ENOMEM;
 965 }
 966 #endif
 967
 968 /*
 969  * Create a new Memory Controller kobject instance,
 970  *      mc<id> under the 'mc' directory
 971  *
 972  * Return:
 973  *      0       Success
 974  *      !0      Failure
 975  */
 976 int edac_create_sysfs_mci_device(struct mem_ctl_info *mci)
 977 {
 978         int i, err;
 979
 980         /*
 981          * The memory controller needs its own bus, in order to avoid
 982          * namespace conflicts at /sys/bus/edac.
 983          */
 984         mci->bus->name = kasprintf(GFP_KERNEL, "mc%d", mci->mc_idx);
 985         if (!mci->bus->name)
 986                 return -ENOMEM;
 987
 988         edac_dbg(0, "creating bus %s\n", mci->bus->name);
 989
 990         err = bus_register(mci->bus);
 991         if (err < 0)
 992                 goto fail_free_name;
 993
 994         /* get the /sys/devices/system/edac subsys reference */
 995         mci->dev.type = &mci_attr_type;
 996         device_initialize(&mci->dev);
 997
 998         mci->dev.parent = mci_pdev;
 999         mci->dev.bus = mci->bus;
1000         dev_set_name(&mci->dev, "mc%d", mci->mc_idx);
1001         dev_set_drvdata(&mci->dev, mci);
1002         pm_runtime_forbid(&mci->dev);
1003
1004         edac_dbg(0, "creating device %s\n", dev_name(&mci->dev));
1005         err = device_add(&mci->dev);
1006         if (err < 0) {
1007                 edac_dbg(1, "failure: create device %s\n", dev_name(&mci->dev));
1008                 goto fail_unregister_bus;
1009         }
1010
1011         if (mci->set_sdram_scrub_rate || mci->get_sdram_scrub_rate) {
1012                 if (mci->get_sdram_scrub_rate) {
1013                         dev_attr_sdram_scrub_rate.attr.mode |= S_IRUGO;
1014                         dev_attr_sdram_scrub_rate.show = &mci_sdram_scrub_rate_show;
1015                 }
1016
1017                 if (mci->set_sdram_scrub_rate) {
1018                         dev_attr_sdram_scrub_rate.attr.mode |= S_IWUSR;
1019                         dev_attr_sdram_scrub_rate.store = &mci_sdram_scrub_rate_store;
1020                 }
1021
1022                 err = device_create_file(&mci->dev, &dev_attr_sdram_scrub_rate);
1023                 if (err) {
1024                         edac_dbg(1, "failure: create sdram_scrub_rate\n");
1025                         goto fail_unregister_dev;
1026                 }
1027         }
1028         /*
1029          * Create the dimm/rank devices
1030          */
1031         for (i = 0; i < mci->tot_dimms; i++) {
1032                 struct dimm_info *dimm = mci->dimms[i];
1033                 /* Only expose populated DIMMs */
1034                 if (!dimm->nr_pages)
1035                         continue;
1036
1037 #ifdef CONFIG_EDAC_DEBUG
1038                 edac_dbg(1, "creating dimm%d, located at ", i);
1039                 if (edac_debug_level >= 1) {
1040                         int lay;
1041                         for (lay = 0; lay < mci->n_layers; lay++)
1042                                 printk(KERN_CONT "%s %d ",
1043                                         edac_layer_name[mci->layers[lay].type],
1044                                         dimm->location[lay]);
1045                         printk(KERN_CONT "\n");
1046                 }
1047 #endif
1048                 err = edac_create_dimm_object(mci, dimm, i);
1049                 if (err) {
1050                         edac_dbg(1, "failure: create dimm %d obj\n", i);
1051                         goto fail_unregister_dimm;
1052                 }
1053         }
1054
1055 #ifdef CONFIG_EDAC_LEGACY_SYSFS
1056         err = edac_create_csrow_objects(mci);
1057         if (err < 0)
1058                 goto fail_unregister_dimm;
1059 #endif
1060
1061 #ifdef CONFIG_EDAC_DEBUG
1062         edac_create_debug_nodes(mci);
1063 #endif
1064         return 0;
1065
1066 fail_unregister_dimm:
1067         for (i--; i >= 0; i--) {
1068                 struct dimm_info *dimm = mci->dimms[i];
1069                 if (!dimm->nr_pages)
1070                         continue;
1071
1072                 device_unregister(&dimm->dev);
1073         }
1074 fail_unregister_dev:
1075         device_unregister(&mci->dev);
1076 fail_unregister_bus:
1077         bus_unregister(mci->bus);
1078 fail_free_name:
1079         kfree(mci->bus->name);
1080         return err;
1081 }
1082
1083 /*
1084  * remove a Memory Controller instance
1085  */
1086 void edac_remove_sysfs_mci_device(struct mem_ctl_info *mci)
1087 {
1088         int i;
1089
1090         edac_dbg(0, "\n");
1091
1092 #ifdef CONFIG_EDAC_DEBUG
1093         debugfs_remove(mci->debugfs);
1094 #endif
1095 #ifdef CONFIG_EDAC_LEGACY_SYSFS
1096         edac_delete_csrow_objects(mci);
1097 #endif
1098
1099         for (i = 0; i < mci->tot_dimms; i++) {
1100                 struct dimm_info *dimm = mci->dimms[i];
1101                 if (dimm->nr_pages == 0)
1102                         continue;
1103                 edac_dbg(0, "removing device %s\n", dev_name(&dimm->dev));
1104                 device_unregister(&dimm->dev);
1105         }
1106 }
1107
1108 void edac_unregister_sysfs(struct mem_ctl_info *mci)
1109 {
1110         edac_dbg(1, "Unregistering device %s\n", dev_name(&mci->dev));
1111         device_unregister(&mci->dev);
1112         bus_unregister(mci->bus);
1113         kfree(mci->bus->name);
1114 }
1115
1116 static void mc_attr_release(struct device *dev)
1117 {
1118         /*
1119          * There's no container structure here, as this is just the mci
1120          * parent device, used to create the /sys/devices/mc sysfs node.
1121          * So, there are no attributes on it.
1122          */
1123         edac_dbg(1, "Releasing device %s\n", dev_name(dev));
1124         kfree(dev);
1125 }
1126
1127 static struct device_type mc_attr_type = {
1128         .release        = mc_attr_release,
1129 };
1130 /*
1131  * Init/exit code for the module. Basically, creates/removes /sys/class/rc
1132  */
1133 int __init edac_mc_sysfs_init(void)
1134 {
1135         struct bus_type *edac_subsys;
1136         int err;
1137
1138         /* get the /sys/devices/system/edac subsys reference */
1139         edac_subsys = edac_get_sysfs_subsys();
1140         if (edac_subsys == NULL) {
1141                 edac_dbg(1, "no edac_subsys\n");
1142                 err = -EINVAL;
1143                 goto out;
1144         }
1145
1146         mci_pdev = kzalloc(sizeof(*mci_pdev), GFP_KERNEL);
1147         if (!mci_pdev) {
1148                 err = -ENOMEM;
1149                 goto out_put_sysfs;
1150         }
1151
1152         mci_pdev->bus = edac_subsys;
1153         mci_pdev->type = &mc_attr_type;
1154         device_initialize(mci_pdev);
1155         dev_set_name(mci_pdev, "mc");
1156
1157         err = device_add(mci_pdev);
1158         if (err < 0)
1159                 goto out_dev_free;
1160
1161         edac_dbg(0, "device %s created\n", dev_name(mci_pdev));
1162
1163         return 0;
1164
1165  out_dev_free:
1166         kfree(mci_pdev);
1167  out_put_sysfs:
1168         edac_put_sysfs_subsys();
1169  out:
1170         return err;
1171 }
1172
1173 void __exit edac_mc_sysfs_exit(void)
1174 {
1175         device_unregister(mci_pdev);
1176         edac_put_sysfs_subsys();
1177 }