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 <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                         edac_dbg(1,
 434                                  "failure: create csrow objects for csrow %d\n",
 435                                  i);
 436                         goto error;
 437                 }
 438         }
 439         return 0;
 440
 441 error:
 442         for (--i; i >= 0; i--) {
 443                 csrow = mci->csrows[i];
 444                 if (!nr_pages_per_csrow(csrow))
 445                         continue;
 446                 for (chan = csrow->nr_channels - 1; chan >= 0; chan--) {
 447                         if (!csrow->channels[chan]->dimm->nr_pages)
 448                                 continue;
 449                         device_remove_file(&csrow->dev,
 450                                                 dynamic_csrow_dimm_attr[chan]);
 451                         device_remove_file(&csrow->dev,
 452                                                 dynamic_csrow_ce_count_attr[chan]);
 453                 }
 454                 put_device(&mci->csrows[i]->dev);
 455         }
 456
 457         return err;
 458 }
 459
 460 static void edac_delete_csrow_objects(struct mem_ctl_info *mci)
 461 {
 462         int i, chan;
 463         struct csrow_info *csrow;
 464
 465         for (i = mci->nr_csrows - 1; i >= 0; i--) {
 466                 csrow = mci->csrows[i];
 467                 if (!nr_pages_per_csrow(csrow))
 468                         continue;
 469                 for (chan = csrow->nr_channels - 1; chan >= 0; chan--) {
 470                         if (!csrow->channels[chan]->dimm->nr_pages)
 471                                 continue;
 472                         edac_dbg(1, "Removing csrow %d channel %d sysfs nodes\n",
 473                                  i, chan);
 474                         device_remove_file(&csrow->dev,
 475                                                 dynamic_csrow_dimm_attr[chan]);
 476                         device_remove_file(&csrow->dev,
 477                                                 dynamic_csrow_ce_count_attr[chan]);
 478                 }
 479                 device_unregister(&mci->csrows[i]->dev);
 480         }
 481 }
 482 #endif
 483
 484 /*
 485  * Per-dimm (or per-rank) devices
 486  */
 487
 488 #define to_dimm(k) container_of(k, struct dimm_info, dev)
 489
 490 /* show/store functions for DIMM Label attributes */
 491 static ssize_t dimmdev_location_show(struct device *dev,
 492                                      struct device_attribute *mattr, char *data)
 493 {
 494         struct dimm_info *dimm = to_dimm(dev);
 495
 496         return edac_dimm_info_location(dimm, data, PAGE_SIZE);
 497 }
 498
 499 static ssize_t dimmdev_label_show(struct device *dev,
 500                                   struct device_attribute *mattr, char *data)
 501 {
 502         struct dimm_info *dimm = to_dimm(dev);
 503
 504         /* if field has not been initialized, there is nothing to send */
 505         if (!dimm->label[0])
 506                 return 0;
 507
 508         return snprintf(data, EDAC_MC_LABEL_LEN, "%s\n", dimm->label);
 509 }
 510
 511 static ssize_t dimmdev_label_store(struct device *dev,
 512                                    struct device_attribute *mattr,
 513                                    const char *data,
 514                                    size_t count)
 515 {
 516         struct dimm_info *dimm = to_dimm(dev);
 517
 518         ssize_t max_size = 0;
 519
 520         max_size = min((ssize_t) count, (ssize_t) EDAC_MC_LABEL_LEN - 1);
 521         strncpy(dimm->label, data, max_size);
 522         dimm->label[max_size] = '\0';
 523
 524         return max_size;
 525 }
 526
 527 static ssize_t dimmdev_size_show(struct device *dev,
 528                                  struct device_attribute *mattr, char *data)
 529 {
 530         struct dimm_info *dimm = to_dimm(dev);
 531
 532         return sprintf(data, "%u\n", PAGES_TO_MiB(dimm->nr_pages));
 533 }
 534
 535 static ssize_t dimmdev_mem_type_show(struct device *dev,
 536                                      struct device_attribute *mattr, char *data)
 537 {
 538         struct dimm_info *dimm = to_dimm(dev);
 539
 540         return sprintf(data, "%s\n", mem_types[dimm->mtype]);
 541 }
 542
 543 static ssize_t dimmdev_dev_type_show(struct device *dev,
 544                                      struct device_attribute *mattr, char *data)
 545 {
 546         struct dimm_info *dimm = to_dimm(dev);
 547
 548         return sprintf(data, "%s\n", dev_types[dimm->dtype]);
 549 }
 550
 551 static ssize_t dimmdev_edac_mode_show(struct device *dev,
 552                                       struct device_attribute *mattr,
 553                                       char *data)
 554 {
 555         struct dimm_info *dimm = to_dimm(dev);
 556
 557         return sprintf(data, "%s\n", edac_caps[dimm->edac_mode]);
 558 }
 559
 560 /* dimm/rank attribute files */
 561 static DEVICE_ATTR(dimm_label, S_IRUGO | S_IWUSR,
 562                    dimmdev_label_show, dimmdev_label_store);
 563 static DEVICE_ATTR(dimm_location, S_IRUGO, dimmdev_location_show, NULL);
 564 static DEVICE_ATTR(size, S_IRUGO, dimmdev_size_show, NULL);
 565 static DEVICE_ATTR(dimm_mem_type, S_IRUGO, dimmdev_mem_type_show, NULL);
 566 static DEVICE_ATTR(dimm_dev_type, S_IRUGO, dimmdev_dev_type_show, NULL);
 567 static DEVICE_ATTR(dimm_edac_mode, S_IRUGO, dimmdev_edac_mode_show, NULL);
 568
 569 /* attributes of the dimm<id>/rank<id> object */
 570 static struct attribute *dimm_attrs[] = {
 571         &dev_attr_dimm_label.attr,
 572         &dev_attr_dimm_location.attr,
 573         &dev_attr_size.attr,
 574         &dev_attr_dimm_mem_type.attr,
 575         &dev_attr_dimm_dev_type.attr,
 576         &dev_attr_dimm_edac_mode.attr,
 577         NULL,
 578 };
 579
 580 static struct attribute_group dimm_attr_grp = {
 581         .attrs  = dimm_attrs,
 582 };
 583
 584 static const struct attribute_group *dimm_attr_groups[] = {
 585         &dimm_attr_grp,
 586         NULL
 587 };
 588
 589 static void dimm_attr_release(struct device *dev)
 590 {
 591         struct dimm_info *dimm = container_of(dev, struct dimm_info, dev);
 592
 593         edac_dbg(1, "Releasing dimm device %s\n", dev_name(dev));
 594         kfree(dimm);
 595 }
 596
 597 static struct device_type dimm_attr_type = {
 598         .groups         = dimm_attr_groups,
 599         .release        = dimm_attr_release,
 600 };
 601
 602 /* Create a DIMM object under specifed memory controller device */
 603 static int edac_create_dimm_object(struct mem_ctl_info *mci,
 604                                    struct dimm_info *dimm,
 605                                    int index)
 606 {
 607         int err;
 608         dimm->mci = mci;
 609
 610         dimm->dev.type = &dimm_attr_type;
 611         dimm->dev.bus = &mci->bus;
 612         device_initialize(&dimm->dev);
 613
 614         dimm->dev.parent = &mci->dev;
 615         if (mci->mem_is_per_rank)
 616                 dev_set_name(&dimm->dev, "rank%d", index);
 617         else
 618                 dev_set_name(&dimm->dev, "dimm%d", index);
 619         dev_set_drvdata(&dimm->dev, dimm);
 620         pm_runtime_forbid(&mci->dev);
 621
 622         err =  device_add(&dimm->dev);
 623
 624         edac_dbg(0, "creating rank/dimm device %s\n", dev_name(&dimm->dev));
 625
 626         return err;
 627 }
 628
 629 /*
 630  * Memory controller device
 631  */
 632
 633 #define to_mci(k) container_of(k, struct mem_ctl_info, dev)
 634
 635 static ssize_t mci_reset_counters_store(struct device *dev,
 636                                         struct device_attribute *mattr,
 637                                         const char *data, size_t count)
 638 {
 639         struct mem_ctl_info *mci = to_mci(dev);
 640         int cnt, row, chan, i;
 641         mci->ue_mc = 0;
 642         mci->ce_mc = 0;
 643         mci->ue_noinfo_count = 0;
 644         mci->ce_noinfo_count = 0;
 645
 646         for (row = 0; row < mci->nr_csrows; row++) {
 647                 struct csrow_info *ri = mci->csrows[row];
 648
 649                 ri->ue_count = 0;
 650                 ri->ce_count = 0;
 651
 652                 for (chan = 0; chan < ri->nr_channels; chan++)
 653                         ri->channels[chan]->ce_count = 0;
 654         }
 655
 656         cnt = 1;
 657         for (i = 0; i < mci->n_layers; i++) {
 658                 cnt *= mci->layers[i].size;
 659                 memset(mci->ce_per_layer[i], 0, cnt * sizeof(u32));
 660                 memset(mci->ue_per_layer[i], 0, cnt * sizeof(u32));
 661         }
 662
 663         mci->start_time = jiffies;
 664         return count;
 665 }
 666
 667 /* Memory scrubbing interface:
 668  *
 669  * A MC driver can limit the scrubbing bandwidth based on the CPU type.
 670  * Therefore, ->set_sdram_scrub_rate should be made to return the actual
 671  * bandwidth that is accepted or 0 when scrubbing is to be disabled.
 672  *
 673  * Negative value still means that an error has occurred while setting
 674  * the scrub rate.
 675  */
 676 static ssize_t mci_sdram_scrub_rate_store(struct device *dev,
 677                                           struct device_attribute *mattr,
 678                                           const char *data, size_t count)
 679 {
 680         struct mem_ctl_info *mci = to_mci(dev);
 681         unsigned long bandwidth = 0;
 682         int new_bw = 0;
 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         bandwidth = mci->get_sdram_scrub_rate(mci);
 708         if (bandwidth < 0) {
 709                 edac_printk(KERN_DEBUG, EDAC_MC, "Error reading scrub rate\n");
 710                 return bandwidth;
 711         }
 712
 713         return sprintf(data, "%d\n", bandwidth);
 714 }
 715
 716 /* default attribute files for the MCI object */
 717 static ssize_t mci_ue_count_show(struct device *dev,
 718                                  struct device_attribute *mattr,
 719                                  char *data)
 720 {
 721         struct mem_ctl_info *mci = to_mci(dev);
 722
 723         return sprintf(data, "%d\n", mci->ue_mc);
 724 }
 725
 726 static ssize_t mci_ce_count_show(struct device *dev,
 727                                  struct device_attribute *mattr,
 728                                  char *data)
 729 {
 730         struct mem_ctl_info *mci = to_mci(dev);
 731
 732         return sprintf(data, "%d\n", mci->ce_mc);
 733 }
 734
 735 static ssize_t mci_ce_noinfo_show(struct device *dev,
 736                                   struct device_attribute *mattr,
 737                                   char *data)
 738 {
 739         struct mem_ctl_info *mci = to_mci(dev);
 740
 741         return sprintf(data, "%d\n", mci->ce_noinfo_count);
 742 }
 743
 744 static ssize_t mci_ue_noinfo_show(struct device *dev,
 745                                   struct device_attribute *mattr,
 746                                   char *data)
 747 {
 748         struct mem_ctl_info *mci = to_mci(dev);
 749
 750         return sprintf(data, "%d\n", mci->ue_noinfo_count);
 751 }
 752
 753 static ssize_t mci_seconds_show(struct device *dev,
 754                                 struct device_attribute *mattr,
 755                                 char *data)
 756 {
 757         struct mem_ctl_info *mci = to_mci(dev);
 758
 759         return sprintf(data, "%ld\n", (jiffies - mci->start_time) / HZ);
 760 }
 761
 762 static ssize_t mci_ctl_name_show(struct device *dev,
 763                                  struct device_attribute *mattr,
 764                                  char *data)
 765 {
 766         struct mem_ctl_info *mci = to_mci(dev);
 767
 768         return sprintf(data, "%s\n", mci->ctl_name);
 769 }
 770
 771 static ssize_t mci_size_mb_show(struct device *dev,
 772                                 struct device_attribute *mattr,
 773                                 char *data)
 774 {
 775         struct mem_ctl_info *mci = to_mci(dev);
 776         int total_pages = 0, csrow_idx, j;
 777
 778         for (csrow_idx = 0; csrow_idx < mci->nr_csrows; csrow_idx++) {
 779                 struct csrow_info *csrow = mci->csrows[csrow_idx];
 780
 781                 if (csrow->mci->csbased) {
 782                         total_pages += csrow->nr_pages;
 783                 } else {
 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
 792         return sprintf(data, "%u\n", PAGES_TO_MiB(total_pages));
 793 }
 794
 795 static ssize_t mci_max_location_show(struct device *dev,
 796                                      struct device_attribute *mattr,
 797                                      char *data)
 798 {
 799         struct mem_ctl_info *mci = to_mci(dev);
 800         int i;
 801         char *p = data;
 802
 803         for (i = 0; i < mci->n_layers; i++) {
 804                 p += sprintf(p, "%s %d ",
 805                              edac_layer_name[mci->layers[i].type],
 806                              mci->layers[i].size - 1);
 807         }
 808
 809         return p - data;
 810 }
 811
 812 #ifdef CONFIG_EDAC_DEBUG
 813 static ssize_t edac_fake_inject_write(struct file *file,
 814                                       const char __user *data,
 815                                       size_t count, loff_t *ppos)
 816 {
 817         struct device *dev = file->private_data;
 818         struct mem_ctl_info *mci = to_mci(dev);
 819         static enum hw_event_mc_err_type type;
 820         u16 errcount = mci->fake_inject_count;
 821
 822         if (!errcount)
 823                 errcount = 1;
 824
 825         type = mci->fake_inject_ue ? HW_EVENT_ERR_UNCORRECTED
 826                                    : HW_EVENT_ERR_CORRECTED;
 827
 828         printk(KERN_DEBUG
 829                "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",
 830                 errcount,
 831                 (type == HW_EVENT_ERR_UNCORRECTED) ? "UE" : "CE",
 832                 errcount > 1 ? "s" : "",
 833                 mci->fake_inject_layer[0],
 834                 mci->fake_inject_layer[1],
 835                 mci->fake_inject_layer[2]
 836                );
 837         edac_mc_handle_error(type, mci, errcount, 0, 0, 0,
 838                              mci->fake_inject_layer[0],
 839                              mci->fake_inject_layer[1],
 840                              mci->fake_inject_layer[2],
 841                              "FAKE ERROR", "for EDAC testing only");
 842
 843         return count;
 844 }
 845
 846 static const struct file_operations debug_fake_inject_fops = {
 847         .open = simple_open,
 848         .write = edac_fake_inject_write,
 849         .llseek = generic_file_llseek,
 850 };
 851 #endif
 852
 853 /* default Control file */
 854 DEVICE_ATTR(reset_counters, S_IWUSR, NULL, mci_reset_counters_store);
 855
 856 /* default Attribute files */
 857 DEVICE_ATTR(mc_name, S_IRUGO, mci_ctl_name_show, NULL);
 858 DEVICE_ATTR(size_mb, S_IRUGO, mci_size_mb_show, NULL);
 859 DEVICE_ATTR(seconds_since_reset, S_IRUGO, mci_seconds_show, NULL);
 860 DEVICE_ATTR(ue_noinfo_count, S_IRUGO, mci_ue_noinfo_show, NULL);
 861 DEVICE_ATTR(ce_noinfo_count, S_IRUGO, mci_ce_noinfo_show, NULL);
 862 DEVICE_ATTR(ue_count, S_IRUGO, mci_ue_count_show, NULL);
 863 DEVICE_ATTR(ce_count, S_IRUGO, mci_ce_count_show, NULL);
 864 DEVICE_ATTR(max_location, S_IRUGO, mci_max_location_show, NULL);
 865
 866 /* memory scrubber attribute file */
 867 DEVICE_ATTR(sdram_scrub_rate, 0, NULL, NULL);
 868
 869 static struct attribute *mci_attrs[] = {
 870         &dev_attr_reset_counters.attr,
 871         &dev_attr_mc_name.attr,
 872         &dev_attr_size_mb.attr,
 873         &dev_attr_seconds_since_reset.attr,
 874         &dev_attr_ue_noinfo_count.attr,
 875         &dev_attr_ce_noinfo_count.attr,
 876         &dev_attr_ue_count.attr,
 877         &dev_attr_ce_count.attr,
 878         &dev_attr_max_location.attr,
 879         NULL
 880 };
 881
 882 static struct attribute_group mci_attr_grp = {
 883         .attrs  = mci_attrs,
 884 };
 885
 886 static const struct attribute_group *mci_attr_groups[] = {
 887         &mci_attr_grp,
 888         NULL
 889 };
 890
 891 static void mci_attr_release(struct device *dev)
 892 {
 893         struct mem_ctl_info *mci = container_of(dev, struct mem_ctl_info, dev);
 894
 895         edac_dbg(1, "Releasing csrow device %s\n", dev_name(dev));
 896         kfree(mci);
 897 }
 898
 899 static struct device_type mci_attr_type = {
 900         .groups         = mci_attr_groups,
 901         .release        = mci_attr_release,
 902 };
 903
 904 #ifdef CONFIG_EDAC_DEBUG
 905 static struct dentry *edac_debugfs;
 906
 907 int __init edac_debugfs_init(void)
 908 {
 909         edac_debugfs = debugfs_create_dir("edac", NULL);
 910         if (IS_ERR(edac_debugfs)) {
 911                 edac_debugfs = NULL;
 912                 return -ENOMEM;
 913         }
 914         return 0;
 915 }
 916
 917 void __exit edac_debugfs_exit(void)
 918 {
 919         debugfs_remove(edac_debugfs);
 920 }
 921
 922 int edac_create_debug_nodes(struct mem_ctl_info *mci)
 923 {
 924         struct dentry *d, *parent;
 925         char name[80];
 926         int i;
 927
 928         if (!edac_debugfs)
 929                 return -ENODEV;
 930
 931         d = debugfs_create_dir(mci->dev.kobj.name, edac_debugfs);
 932         if (!d)
 933                 return -ENOMEM;
 934         parent = d;
 935
 936         for (i = 0; i < mci->n_layers; i++) {
 937                 sprintf(name, "fake_inject_%s",
 938                              edac_layer_name[mci->layers[i].type]);
 939                 d = debugfs_create_u8(name, S_IRUGO | S_IWUSR, parent,
 940                                       &mci->fake_inject_layer[i]);
 941                 if (!d)
 942                         goto nomem;
 943         }
 944
 945         d = debugfs_create_bool("fake_inject_ue", S_IRUGO | S_IWUSR, parent,
 946                                 &mci->fake_inject_ue);
 947         if (!d)
 948                 goto nomem;
 949
 950         d = debugfs_create_u16("fake_inject_count", S_IRUGO | S_IWUSR, parent,
 951                                 &mci->fake_inject_count);
 952         if (!d)
 953                 goto nomem;
 954
 955         d = debugfs_create_file("fake_inject", S_IWUSR, parent,
 956                                 &mci->dev,
 957                                 &debug_fake_inject_fops);
 958         if (!d)
 959                 goto nomem;
 960
 961         mci->debugfs = parent;
 962         return 0;
 963 nomem:
 964         debugfs_remove(mci->debugfs);
 965         return -ENOMEM;
 966 }
 967 #endif
 968
 969 /*
 970  * Create a new Memory Controller kobject instance,
 971  *      mc<id> under the 'mc' directory
 972  *
 973  * Return:
 974  *      0       Success
 975  *      !0      Failure
 976  */
 977 int edac_create_sysfs_mci_device(struct mem_ctl_info *mci)
 978 {
 979         int i, err;
 980
 981         /*
 982          * The memory controller needs its own bus, in order to avoid
 983          * namespace conflicts at /sys/bus/edac.
 984          */
 985         mci->bus.name = kasprintf(GFP_KERNEL, "mc%d", mci->mc_idx);
 986         if (!mci->bus.name)
 987                 return -ENOMEM;
 988         edac_dbg(0, "creating bus %s\n", mci->bus.name);
 989         err = bus_register(&mci->bus);
 990         if (err < 0)
 991                 return err;
 992
 993         /* get the /sys/devices/system/edac subsys reference */
 994         mci->dev.type = &mci_attr_type;
 995         device_initialize(&mci->dev);
 996
 997         mci->dev.parent = mci_pdev;
 998         mci->dev.bus = &mci->bus;
 999         dev_set_name(&mci->dev, "mc%d", mci->mc_idx);
1000         dev_set_drvdata(&mci->dev, mci);
1001         pm_runtime_forbid(&mci->dev);
1002
1003         edac_dbg(0, "creating device %s\n", dev_name(&mci->dev));
1004         err = device_add(&mci->dev);
1005         if (err < 0) {
1006                 edac_dbg(1, "failure: create device %s\n", dev_name(&mci->dev));
1007                 bus_unregister(&mci->bus);
1008                 kfree(mci->bus.name);
1009                 return err;
1010         }
1011
1012         if (mci->set_sdram_scrub_rate || mci->get_sdram_scrub_rate) {
1013                 if (mci->get_sdram_scrub_rate) {
1014                         dev_attr_sdram_scrub_rate.attr.mode |= S_IRUGO;
1015                         dev_attr_sdram_scrub_rate.show = &mci_sdram_scrub_rate_show;
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                 err = device_create_file(&mci->dev,
1022                                          &dev_attr_sdram_scrub_rate);
1023                 if (err) {
1024                         edac_dbg(1, "failure: create sdram_scrub_rate\n");
1025                         goto fail2;
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 == 0)
1035                         continue;
1036 #ifdef CONFIG_EDAC_DEBUG
1037                 edac_dbg(1, "creating dimm%d, located at ", i);
1038                 if (edac_debug_level >= 1) {
1039                         int lay;
1040                         for (lay = 0; lay < mci->n_layers; lay++)
1041                                 printk(KERN_CONT "%s %d ",
1042                                         edac_layer_name[mci->layers[lay].type],
1043                                         dimm->location[lay]);
1044                         printk(KERN_CONT "\n");
1045                 }
1046 #endif
1047                 err = edac_create_dimm_object(mci, dimm, i);
1048                 if (err) {
1049                         edac_dbg(1, "failure: create dimm %d obj\n", i);
1050                         goto fail;
1051                 }
1052         }
1053
1054 #ifdef CONFIG_EDAC_LEGACY_SYSFS
1055         err = edac_create_csrow_objects(mci);
1056         if (err < 0)
1057                 goto fail;
1058 #endif
1059
1060 #ifdef CONFIG_EDAC_DEBUG
1061         edac_create_debug_nodes(mci);
1062 #endif
1063         return 0;
1064
1065 fail:
1066         for (i--; i >= 0; i--) {
1067                 struct dimm_info *dimm = mci->dimms[i];
1068                 if (dimm->nr_pages == 0)
1069                         continue;
1070                 device_unregister(&dimm->dev);
1071         }
1072 fail2:
1073         device_unregister(&mci->dev);
1074         bus_unregister(&mci->bus);
1075         kfree(mci->bus.name);
1076         return err;
1077 }
1078
1079 /*
1080  * remove a Memory Controller instance
1081  */
1082 void edac_remove_sysfs_mci_device(struct mem_ctl_info *mci)
1083 {
1084         int i;
1085
1086         edac_dbg(0, "\n");
1087
1088 #ifdef CONFIG_EDAC_DEBUG
1089         debugfs_remove(mci->debugfs);
1090 #endif
1091 #ifdef CONFIG_EDAC_LEGACY_SYSFS
1092         edac_delete_csrow_objects(mci);
1093 #endif
1094
1095         for (i = 0; i < mci->tot_dimms; i++) {
1096                 struct dimm_info *dimm = mci->dimms[i];
1097                 if (dimm->nr_pages == 0)
1098                         continue;
1099                 edac_dbg(0, "removing device %s\n", dev_name(&dimm->dev));
1100                 device_unregister(&dimm->dev);
1101         }
1102 }
1103
1104 void edac_unregister_sysfs(struct mem_ctl_info *mci)
1105 {
1106         edac_dbg(1, "Unregistering device %s\n", dev_name(&mci->dev));
1107         device_unregister(&mci->dev);
1108         bus_unregister(&mci->bus);
1109         kfree(mci->bus.name);
1110 }
1111
1112 static void mc_attr_release(struct device *dev)
1113 {
1114         /*
1115          * There's no container structure here, as this is just the mci
1116          * parent device, used to create the /sys/devices/mc sysfs node.
1117          * So, there are no attributes on it.
1118          */
1119         edac_dbg(1, "Releasing device %s\n", dev_name(dev));
1120         kfree(dev);
1121 }
1122
1123 static struct device_type mc_attr_type = {
1124         .release        = mc_attr_release,
1125 };
1126 /*
1127  * Init/exit code for the module. Basically, creates/removes /sys/class/rc
1128  */
1129 int __init edac_mc_sysfs_init(void)
1130 {
1131         struct bus_type *edac_subsys;
1132         int err;
1133
1134         /* get the /sys/devices/system/edac subsys reference */
1135         edac_subsys = edac_get_sysfs_subsys();
1136         if (edac_subsys == NULL) {
1137                 edac_dbg(1, "no edac_subsys\n");
1138                 err = -EINVAL;
1139                 goto out;
1140         }
1141
1142         mci_pdev = kzalloc(sizeof(*mci_pdev), GFP_KERNEL);
1143         if (!mci_pdev) {
1144                 err = -ENOMEM;
1145                 goto out_put_sysfs;
1146         }
1147
1148         mci_pdev->bus = edac_subsys;
1149         mci_pdev->type = &mc_attr_type;
1150         device_initialize(mci_pdev);
1151         dev_set_name(mci_pdev, "mc");
1152
1153         err = device_add(mci_pdev);
1154         if (err < 0)
1155                 goto out_dev_free;
1156
1157         edac_dbg(0, "device %s created\n", dev_name(mci_pdev));
1158
1159         return 0;
1160
1161  out_dev_free:
1162         kfree(mci_pdev);
1163  out_put_sysfs:
1164         edac_put_sysfs_subsys();
1165  out:
1166         return err;
1167 }
1168
1169 void __exit edac_mc_sysfs_exit(void)
1170 {
1171         device_unregister(mci_pdev);
1172         edac_put_sysfs_subsys();
1173 }