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                 put_device(&mci->csrows[i]->dev);
 476                 device_del(&mci->csrows[i]->dev);
 477         }
 478 }
 479 #endif
 480
 481 /*
 482  * Per-dimm (or per-rank) devices
 483  */
 484
 485 #define to_dimm(k) container_of(k, struct dimm_info, dev)
 486
 487 /* show/store functions for DIMM Label attributes */
 488 static ssize_t dimmdev_location_show(struct device *dev,
 489                                      struct device_attribute *mattr, char *data)
 490 {
 491         struct dimm_info *dimm = to_dimm(dev);
 492
 493         return edac_dimm_info_location(dimm, data, PAGE_SIZE);
 494 }
 495
 496 static ssize_t dimmdev_label_show(struct device *dev,
 497                                   struct device_attribute *mattr, char *data)
 498 {
 499         struct dimm_info *dimm = to_dimm(dev);
 500
 501         /* if field has not been initialized, there is nothing to send */
 502         if (!dimm->label[0])
 503                 return 0;
 504
 505         return snprintf(data, EDAC_MC_LABEL_LEN, "%s\n", dimm->label);
 506 }
 507
 508 static ssize_t dimmdev_label_store(struct device *dev,
 509                                    struct device_attribute *mattr,
 510                                    const char *data,
 511                                    size_t count)
 512 {
 513         struct dimm_info *dimm = to_dimm(dev);
 514
 515         ssize_t max_size = 0;
 516
 517         max_size = min((ssize_t) count, (ssize_t) EDAC_MC_LABEL_LEN - 1);
 518         strncpy(dimm->label, data, max_size);
 519         dimm->label[max_size] = '\0';
 520
 521         return max_size;
 522 }
 523
 524 static ssize_t dimmdev_size_show(struct device *dev,
 525                                  struct device_attribute *mattr, char *data)
 526 {
 527         struct dimm_info *dimm = to_dimm(dev);
 528
 529         return sprintf(data, "%u\n", PAGES_TO_MiB(dimm->nr_pages));
 530 }
 531
 532 static ssize_t dimmdev_mem_type_show(struct device *dev,
 533                                      struct device_attribute *mattr, char *data)
 534 {
 535         struct dimm_info *dimm = to_dimm(dev);
 536
 537         return sprintf(data, "%s\n", mem_types[dimm->mtype]);
 538 }
 539
 540 static ssize_t dimmdev_dev_type_show(struct device *dev,
 541                                      struct device_attribute *mattr, char *data)
 542 {
 543         struct dimm_info *dimm = to_dimm(dev);
 544
 545         return sprintf(data, "%s\n", dev_types[dimm->dtype]);
 546 }
 547
 548 static ssize_t dimmdev_edac_mode_show(struct device *dev,
 549                                       struct device_attribute *mattr,
 550                                       char *data)
 551 {
 552         struct dimm_info *dimm = to_dimm(dev);
 553
 554         return sprintf(data, "%s\n", edac_caps[dimm->edac_mode]);
 555 }
 556
 557 /* dimm/rank attribute files */
 558 static DEVICE_ATTR(dimm_label, S_IRUGO | S_IWUSR,
 559                    dimmdev_label_show, dimmdev_label_store);
 560 static DEVICE_ATTR(dimm_location, S_IRUGO, dimmdev_location_show, NULL);
 561 static DEVICE_ATTR(size, S_IRUGO, dimmdev_size_show, NULL);
 562 static DEVICE_ATTR(dimm_mem_type, S_IRUGO, dimmdev_mem_type_show, NULL);
 563 static DEVICE_ATTR(dimm_dev_type, S_IRUGO, dimmdev_dev_type_show, NULL);
 564 static DEVICE_ATTR(dimm_edac_mode, S_IRUGO, dimmdev_edac_mode_show, NULL);
 565
 566 /* attributes of the dimm<id>/rank<id> object */
 567 static struct attribute *dimm_attrs[] = {
 568         &dev_attr_dimm_label.attr,
 569         &dev_attr_dimm_location.attr,
 570         &dev_attr_size.attr,
 571         &dev_attr_dimm_mem_type.attr,
 572         &dev_attr_dimm_dev_type.attr,
 573         &dev_attr_dimm_edac_mode.attr,
 574         NULL,
 575 };
 576
 577 static struct attribute_group dimm_attr_grp = {
 578         .attrs  = dimm_attrs,
 579 };
 580
 581 static const struct attribute_group *dimm_attr_groups[] = {
 582         &dimm_attr_grp,
 583         NULL
 584 };
 585
 586 static void dimm_attr_release(struct device *dev)
 587 {
 588         struct dimm_info *dimm = container_of(dev, struct dimm_info, dev);
 589
 590         edac_dbg(1, "Releasing dimm device %s\n", dev_name(dev));
 591         kfree(dimm);
 592 }
 593
 594 static struct device_type dimm_attr_type = {
 595         .groups         = dimm_attr_groups,
 596         .release        = dimm_attr_release,
 597 };
 598
 599 /* Create a DIMM object under specifed memory controller device */
 600 static int edac_create_dimm_object(struct mem_ctl_info *mci,
 601                                    struct dimm_info *dimm,
 602                                    int index)
 603 {
 604         int err;
 605         dimm->mci = mci;
 606
 607         dimm->dev.type = &dimm_attr_type;
 608         dimm->dev.bus = &mci->bus;
 609         device_initialize(&dimm->dev);
 610
 611         dimm->dev.parent = &mci->dev;
 612         if (mci->mem_is_per_rank)
 613                 dev_set_name(&dimm->dev, "rank%d", index);
 614         else
 615                 dev_set_name(&dimm->dev, "dimm%d", index);
 616         dev_set_drvdata(&dimm->dev, dimm);
 617         pm_runtime_forbid(&mci->dev);
 618
 619         err =  device_add(&dimm->dev);
 620
 621         edac_dbg(0, "creating rank/dimm device %s\n", dev_name(&dimm->dev));
 622
 623         return err;
 624 }
 625
 626 /*
 627  * Memory controller device
 628  */
 629
 630 #define to_mci(k) container_of(k, struct mem_ctl_info, dev)
 631
 632 static ssize_t mci_reset_counters_store(struct device *dev,
 633                                         struct device_attribute *mattr,
 634                                         const char *data, size_t count)
 635 {
 636         struct mem_ctl_info *mci = to_mci(dev);
 637         int cnt, row, chan, i;
 638         mci->ue_mc = 0;
 639         mci->ce_mc = 0;
 640         mci->ue_noinfo_count = 0;
 641         mci->ce_noinfo_count = 0;
 642
 643         for (row = 0; row < mci->nr_csrows; row++) {
 644                 struct csrow_info *ri = mci->csrows[row];
 645
 646                 ri->ue_count = 0;
 647                 ri->ce_count = 0;
 648
 649                 for (chan = 0; chan < ri->nr_channels; chan++)
 650                         ri->channels[chan]->ce_count = 0;
 651         }
 652
 653         cnt = 1;
 654         for (i = 0; i < mci->n_layers; i++) {
 655                 cnt *= mci->layers[i].size;
 656                 memset(mci->ce_per_layer[i], 0, cnt * sizeof(u32));
 657                 memset(mci->ue_per_layer[i], 0, cnt * sizeof(u32));
 658         }
 659
 660         mci->start_time = jiffies;
 661         return count;
 662 }
 663
 664 /* Memory scrubbing interface:
 665  *
 666  * A MC driver can limit the scrubbing bandwidth based on the CPU type.
 667  * Therefore, ->set_sdram_scrub_rate should be made to return the actual
 668  * bandwidth that is accepted or 0 when scrubbing is to be disabled.
 669  *
 670  * Negative value still means that an error has occurred while setting
 671  * the scrub rate.
 672  */
 673 static ssize_t mci_sdram_scrub_rate_store(struct device *dev,
 674                                           struct device_attribute *mattr,
 675                                           const char *data, size_t count)
 676 {
 677         struct mem_ctl_info *mci = to_mci(dev);
 678         unsigned long bandwidth = 0;
 679         int new_bw = 0;
 680
 681         if (!mci->set_sdram_scrub_rate)
 682                 return -ENODEV;
 683
 684         if (strict_strtoul(data, 10, &bandwidth) < 0)
 685                 return -EINVAL;
 686
 687         new_bw = mci->set_sdram_scrub_rate(mci, bandwidth);
 688         if (new_bw < 0) {
 689                 edac_printk(KERN_WARNING, EDAC_MC,
 690                             "Error setting scrub rate to: %lu\n", bandwidth);
 691                 return -EINVAL;
 692         }
 693
 694         return count;
 695 }
 696
 697 /*
 698  * ->get_sdram_scrub_rate() return value semantics same as above.
 699  */
 700 static ssize_t mci_sdram_scrub_rate_show(struct device *dev,
 701                                          struct device_attribute *mattr,
 702                                          char *data)
 703 {
 704         struct mem_ctl_info *mci = to_mci(dev);
 705         int bandwidth = 0;
 706
 707         if (!mci->get_sdram_scrub_rate)
 708                 return -ENODEV;
 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                 if (csrow->mci->csbased) {
 785                         total_pages += csrow->nr_pages;
 786                 } else {
 787                         for (j = 0; j < csrow->nr_channels; j++) {
 788                                 struct dimm_info *dimm = csrow->channels[j]->dimm;
 789
 790                                 total_pages += dimm->nr_pages;
 791                         }
 792                 }
 793         }
 794
 795         return sprintf(data, "%u\n", PAGES_TO_MiB(total_pages));
 796 }
 797
 798 static ssize_t mci_max_location_show(struct device *dev,
 799                                      struct device_attribute *mattr,
 800                                      char *data)
 801 {
 802         struct mem_ctl_info *mci = to_mci(dev);
 803         int i;
 804         char *p = data;
 805
 806         for (i = 0; i < mci->n_layers; i++) {
 807                 p += sprintf(p, "%s %d ",
 808                              edac_layer_name[mci->layers[i].type],
 809                              mci->layers[i].size - 1);
 810         }
 811
 812         return p - data;
 813 }
 814
 815 #ifdef CONFIG_EDAC_DEBUG
 816 static ssize_t edac_fake_inject_write(struct file *file,
 817                                       const char __user *data,
 818                                       size_t count, loff_t *ppos)
 819 {
 820         struct device *dev = file->private_data;
 821         struct mem_ctl_info *mci = to_mci(dev);
 822         static enum hw_event_mc_err_type type;
 823         u16 errcount = mci->fake_inject_count;
 824
 825         if (!errcount)
 826                 errcount = 1;
 827
 828         type = mci->fake_inject_ue ? HW_EVENT_ERR_UNCORRECTED
 829                                    : HW_EVENT_ERR_CORRECTED;
 830
 831         printk(KERN_DEBUG
 832                "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",
 833                 errcount,
 834                 (type == HW_EVENT_ERR_UNCORRECTED) ? "UE" : "CE",
 835                 errcount > 1 ? "s" : "",
 836                 mci->fake_inject_layer[0],
 837                 mci->fake_inject_layer[1],
 838                 mci->fake_inject_layer[2]
 839                );
 840         edac_mc_handle_error(type, mci, errcount, 0, 0, 0,
 841                              mci->fake_inject_layer[0],
 842                              mci->fake_inject_layer[1],
 843                              mci->fake_inject_layer[2],
 844                              "FAKE ERROR", "for EDAC testing only");
 845
 846         return count;
 847 }
 848
 849 static const struct file_operations debug_fake_inject_fops = {
 850         .open = simple_open,
 851         .write = edac_fake_inject_write,
 852         .llseek = generic_file_llseek,
 853 };
 854 #endif
 855
 856 /* default Control file */
 857 DEVICE_ATTR(reset_counters, S_IWUSR, NULL, mci_reset_counters_store);
 858
 859 /* default Attribute files */
 860 DEVICE_ATTR(mc_name, S_IRUGO, mci_ctl_name_show, NULL);
 861 DEVICE_ATTR(size_mb, S_IRUGO, mci_size_mb_show, NULL);
 862 DEVICE_ATTR(seconds_since_reset, S_IRUGO, mci_seconds_show, NULL);
 863 DEVICE_ATTR(ue_noinfo_count, S_IRUGO, mci_ue_noinfo_show, NULL);
 864 DEVICE_ATTR(ce_noinfo_count, S_IRUGO, mci_ce_noinfo_show, NULL);
 865 DEVICE_ATTR(ue_count, S_IRUGO, mci_ue_count_show, NULL);
 866 DEVICE_ATTR(ce_count, S_IRUGO, mci_ce_count_show, NULL);
 867 DEVICE_ATTR(max_location, S_IRUGO, mci_max_location_show, NULL);
 868
 869 /* memory scrubber attribute file */
 870 DEVICE_ATTR(sdram_scrub_rate, S_IRUGO | S_IWUSR, mci_sdram_scrub_rate_show,
 871         mci_sdram_scrub_rate_store);
 872
 873 static struct attribute *mci_attrs[] = {
 874         &dev_attr_reset_counters.attr,
 875         &dev_attr_mc_name.attr,
 876         &dev_attr_size_mb.attr,
 877         &dev_attr_seconds_since_reset.attr,
 878         &dev_attr_ue_noinfo_count.attr,
 879         &dev_attr_ce_noinfo_count.attr,
 880         &dev_attr_ue_count.attr,
 881         &dev_attr_ce_count.attr,
 882         &dev_attr_sdram_scrub_rate.attr,
 883         &dev_attr_max_location.attr,
 884         NULL
 885 };
 886
 887 static struct attribute_group mci_attr_grp = {
 888         .attrs  = mci_attrs,
 889 };
 890
 891 static const struct attribute_group *mci_attr_groups[] = {
 892         &mci_attr_grp,
 893         NULL
 894 };
 895
 896 static void mci_attr_release(struct device *dev)
 897 {
 898         struct mem_ctl_info *mci = container_of(dev, struct mem_ctl_info, dev);
 899
 900         edac_dbg(1, "Releasing csrow device %s\n", dev_name(dev));
 901         kfree(mci);
 902 }
 903
 904 static struct device_type mci_attr_type = {
 905         .groups         = mci_attr_groups,
 906         .release        = mci_attr_release,
 907 };
 908
 909 #ifdef CONFIG_EDAC_DEBUG
 910 static struct dentry *edac_debugfs;
 911
 912 int __init edac_debugfs_init(void)
 913 {
 914         edac_debugfs = debugfs_create_dir("edac", NULL);
 915         if (IS_ERR(edac_debugfs)) {
 916                 edac_debugfs = NULL;
 917                 return -ENOMEM;
 918         }
 919         return 0;
 920 }
 921
 922 void __exit edac_debugfs_exit(void)
 923 {
 924         debugfs_remove(edac_debugfs);
 925 }
 926
 927 int edac_create_debug_nodes(struct mem_ctl_info *mci)
 928 {
 929         struct dentry *d, *parent;
 930         char name[80];
 931         int i;
 932
 933         if (!edac_debugfs)
 934                 return -ENODEV;
 935
 936         d = debugfs_create_dir(mci->dev.kobj.name, edac_debugfs);
 937         if (!d)
 938                 return -ENOMEM;
 939         parent = d;
 940
 941         for (i = 0; i < mci->n_layers; i++) {
 942                 sprintf(name, "fake_inject_%s",
 943                              edac_layer_name[mci->layers[i].type]);
 944                 d = debugfs_create_u8(name, S_IRUGO | S_IWUSR, parent,
 945                                       &mci->fake_inject_layer[i]);
 946                 if (!d)
 947                         goto nomem;
 948         }
 949
 950         d = debugfs_create_bool("fake_inject_ue", S_IRUGO | S_IWUSR, parent,
 951                                 &mci->fake_inject_ue);
 952         if (!d)
 953                 goto nomem;
 954
 955         d = debugfs_create_u16("fake_inject_count", S_IRUGO | S_IWUSR, parent,
 956                                 &mci->fake_inject_count);
 957         if (!d)
 958                 goto nomem;
 959
 960         d = debugfs_create_file("fake_inject", S_IWUSR, parent,
 961                                 &mci->dev,
 962                                 &debug_fake_inject_fops);
 963         if (!d)
 964                 goto nomem;
 965
 966         mci->debugfs = parent;
 967         return 0;
 968 nomem:
 969         debugfs_remove(mci->debugfs);
 970         return -ENOMEM;
 971 }
 972 #endif
 973
 974 /*
 975  * Create a new Memory Controller kobject instance,
 976  *      mc<id> under the 'mc' directory
 977  *
 978  * Return:
 979  *      0       Success
 980  *      !0      Failure
 981  */
 982 int edac_create_sysfs_mci_device(struct mem_ctl_info *mci)
 983 {
 984         int i, err;
 985
 986         /*
 987          * The memory controller needs its own bus, in order to avoid
 988          * namespace conflicts at /sys/bus/edac.
 989          */
 990         mci->bus.name = kasprintf(GFP_KERNEL, "mc%d", mci->mc_idx);
 991         if (!mci->bus.name)
 992                 return -ENOMEM;
 993         edac_dbg(0, "creating bus %s\n", mci->bus.name);
 994         err = bus_register(&mci->bus);
 995         if (err < 0)
 996                 return err;
 997
 998         /* get the /sys/devices/system/edac subsys reference */
 999         mci->dev.type = &mci_attr_type;
1000         device_initialize(&mci->dev);
1001
1002         mci->dev.parent = mci_pdev;
1003         mci->dev.bus = &mci->bus;
1004         dev_set_name(&mci->dev, "mc%d", mci->mc_idx);
1005         dev_set_drvdata(&mci->dev, mci);
1006         pm_runtime_forbid(&mci->dev);
1007
1008         edac_dbg(0, "creating device %s\n", dev_name(&mci->dev));
1009         err = device_add(&mci->dev);
1010         if (err < 0) {
1011                 bus_unregister(&mci->bus);
1012                 kfree(mci->bus.name);
1013                 return err;
1014         }
1015
1016         /*
1017          * Create the dimm/rank devices
1018          */
1019         for (i = 0; i < mci->tot_dimms; i++) {
1020                 struct dimm_info *dimm = mci->dimms[i];
1021                 /* Only expose populated DIMMs */
1022                 if (dimm->nr_pages == 0)
1023                         continue;
1024 #ifdef CONFIG_EDAC_DEBUG
1025                 edac_dbg(1, "creating dimm%d, located at ", i);
1026                 if (edac_debug_level >= 1) {
1027                         int lay;
1028                         for (lay = 0; lay < mci->n_layers; lay++)
1029                                 printk(KERN_CONT "%s %d ",
1030                                         edac_layer_name[mci->layers[lay].type],
1031                                         dimm->location[lay]);
1032                         printk(KERN_CONT "\n");
1033                 }
1034 #endif
1035                 err = edac_create_dimm_object(mci, dimm, i);
1036                 if (err) {
1037                         edac_dbg(1, "failure: create dimm %d obj\n", i);
1038                         goto fail;
1039                 }
1040         }
1041
1042 #ifdef CONFIG_EDAC_LEGACY_SYSFS
1043         err = edac_create_csrow_objects(mci);
1044         if (err < 0)
1045                 goto fail;
1046 #endif
1047
1048 #ifdef CONFIG_EDAC_DEBUG
1049         edac_create_debug_nodes(mci);
1050 #endif
1051         return 0;
1052
1053 fail:
1054         for (i--; i >= 0; i--) {
1055                 struct dimm_info *dimm = mci->dimms[i];
1056                 if (dimm->nr_pages == 0)
1057                         continue;
1058                 put_device(&dimm->dev);
1059                 device_del(&dimm->dev);
1060         }
1061         put_device(&mci->dev);
1062         device_del(&mci->dev);
1063         bus_unregister(&mci->bus);
1064         kfree(mci->bus.name);
1065         return err;
1066 }
1067
1068 /*
1069  * remove a Memory Controller instance
1070  */
1071 void edac_remove_sysfs_mci_device(struct mem_ctl_info *mci)
1072 {
1073         int i;
1074
1075         edac_dbg(0, "\n");
1076
1077 #ifdef CONFIG_EDAC_DEBUG
1078         debugfs_remove(mci->debugfs);
1079 #endif
1080 #ifdef CONFIG_EDAC_LEGACY_SYSFS
1081         edac_delete_csrow_objects(mci);
1082 #endif
1083
1084         for (i = 0; i < mci->tot_dimms; i++) {
1085                 struct dimm_info *dimm = mci->dimms[i];
1086                 if (dimm->nr_pages == 0)
1087                         continue;
1088                 edac_dbg(0, "removing device %s\n", dev_name(&dimm->dev));
1089                 put_device(&dimm->dev);
1090                 device_del(&dimm->dev);
1091         }
1092 }
1093
1094 void edac_unregister_sysfs(struct mem_ctl_info *mci)
1095 {
1096         edac_dbg(1, "Unregistering device %s\n", dev_name(&mci->dev));
1097         put_device(&mci->dev);
1098         device_del(&mci->dev);
1099         bus_unregister(&mci->bus);
1100         kfree(mci->bus.name);
1101 }
1102
1103 static void mc_attr_release(struct device *dev)
1104 {
1105         /*
1106          * There's no container structure here, as this is just the mci
1107          * parent device, used to create the /sys/devices/mc sysfs node.
1108          * So, there are no attributes on it.
1109          */
1110         edac_dbg(1, "Releasing device %s\n", dev_name(dev));
1111         kfree(dev);
1112 }
1113
1114 static struct device_type mc_attr_type = {
1115         .release        = mc_attr_release,
1116 };
1117 /*
1118  * Init/exit code for the module. Basically, creates/removes /sys/class/rc
1119  */
1120 int __init edac_mc_sysfs_init(void)
1121 {
1122         struct bus_type *edac_subsys;
1123         int err;
1124
1125         /* get the /sys/devices/system/edac subsys reference */
1126         edac_subsys = edac_get_sysfs_subsys();
1127         if (edac_subsys == NULL) {
1128                 edac_dbg(1, "no edac_subsys\n");
1129                 err = -EINVAL;
1130                 goto out;
1131         }
1132
1133         mci_pdev = kzalloc(sizeof(*mci_pdev), GFP_KERNEL);
1134         if (!mci_pdev) {
1135                 err = -ENOMEM;
1136                 goto out_put_sysfs;
1137         }
1138
1139         mci_pdev->bus = edac_subsys;
1140         mci_pdev->type = &mc_attr_type;
1141         device_initialize(mci_pdev);
1142         dev_set_name(mci_pdev, "mc");
1143
1144         err = device_add(mci_pdev);
1145         if (err < 0)
1146                 goto out_dev_free;
1147
1148         edac_dbg(0, "device %s created\n", dev_name(mci_pdev));
1149
1150         return 0;
1151
1152  out_dev_free:
1153         kfree(mci_pdev);
1154  out_put_sysfs:
1155         edac_put_sysfs_subsys();
1156  out:
1157         return err;
1158 }
1159
1160 void __exit edac_mc_sysfs_exit(void)
1161 {
1162         put_device(mci_pdev);
1163         device_del(mci_pdev);
1164         edac_put_sysfs_subsys();
1165         kfree(mci_pdev);
1166 }