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         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 };
 113
 114 static const char * const dev_types[] = {
 115         [DEV_UNKNOWN] = "Unknown",
 116         [DEV_X1] = "x1",
 117         [DEV_X2] = "x2",
 118         [DEV_X4] = "x4",
 119         [DEV_X8] = "x8",
 120         [DEV_X16] = "x16",
 121         [DEV_X32] = "x32",
 122         [DEV_X64] = "x64"
 123 };
 124
 125 static const char * const edac_caps[] = {
 126         [EDAC_UNKNOWN] = "Unknown",
 127         [EDAC_NONE] = "None",
 128         [EDAC_RESERVED] = "Reserved",
 129         [EDAC_PARITY] = "PARITY",
 130         [EDAC_EC] = "EC",
 131         [EDAC_SECDED] = "SECDED",
 132         [EDAC_S2ECD2ED] = "S2ECD2ED",
 133         [EDAC_S4ECD4ED] = "S4ECD4ED",
 134         [EDAC_S8ECD8ED] = "S8ECD8ED",
 135         [EDAC_S16ECD16ED] = "S16ECD16ED"
 136 };
 137
 138 #ifdef CONFIG_EDAC_LEGACY_SYSFS
 139 /*
 140  * EDAC sysfs CSROW data structures and methods
 141  */
 142
 143 #define to_csrow(k) container_of(k, struct csrow_info, dev)
 144
 145 /*
 146  * We need it to avoid namespace conflicts between the legacy API
 147  * and the per-dimm/per-rank one
 148  */
 149 #define DEVICE_ATTR_LEGACY(_name, _mode, _show, _store) \
 150         static struct device_attribute dev_attr_legacy_##_name = __ATTR(_name, _mode, _show, _store)
 151
 152 struct dev_ch_attribute {
 153         struct device_attribute attr;
 154         int channel;
 155 };
 156
 157 #define DEVICE_CHANNEL(_name, _mode, _show, _store, _var) \
 158         struct dev_ch_attribute dev_attr_legacy_##_name = \
 159                 { __ATTR(_name, _mode, _show, _store), (_var) }
 160
 161 #define to_channel(k) (container_of(k, struct dev_ch_attribute, attr)->channel)
 162
 163 /* Set of more default csrow<id> attribute show/store functions */
 164 static ssize_t csrow_ue_count_show(struct device *dev,
 165                                    struct device_attribute *mattr, char *data)
 166 {
 167         struct csrow_info *csrow = to_csrow(dev);
 168
 169         return sprintf(data, "%u\n", csrow->ue_count);
 170 }
 171
 172 static ssize_t csrow_ce_count_show(struct device *dev,
 173                                    struct device_attribute *mattr, char *data)
 174 {
 175         struct csrow_info *csrow = to_csrow(dev);
 176
 177         return sprintf(data, "%u\n", csrow->ce_count);
 178 }
 179
 180 static ssize_t csrow_size_show(struct device *dev,
 181                                struct device_attribute *mattr, char *data)
 182 {
 183         struct csrow_info *csrow = to_csrow(dev);
 184         int i;
 185         u32 nr_pages = 0;
 186
 187         for (i = 0; i < csrow->nr_channels; i++)
 188                 nr_pages += csrow->channels[i]->dimm->nr_pages;
 189         return sprintf(data, "%u\n", PAGES_TO_MiB(nr_pages));
 190 }
 191
 192 static ssize_t csrow_mem_type_show(struct device *dev,
 193                                    struct device_attribute *mattr, char *data)
 194 {
 195         struct csrow_info *csrow = to_csrow(dev);
 196
 197         return sprintf(data, "%s\n", mem_types[csrow->channels[0]->dimm->mtype]);
 198 }
 199
 200 static ssize_t csrow_dev_type_show(struct device *dev,
 201                                    struct device_attribute *mattr, char *data)
 202 {
 203         struct csrow_info *csrow = to_csrow(dev);
 204
 205         return sprintf(data, "%s\n", dev_types[csrow->channels[0]->dimm->dtype]);
 206 }
 207
 208 static ssize_t csrow_edac_mode_show(struct device *dev,
 209                                     struct device_attribute *mattr,
 210                                     char *data)
 211 {
 212         struct csrow_info *csrow = to_csrow(dev);
 213
 214         return sprintf(data, "%s\n", edac_caps[csrow->channels[0]->dimm->edac_mode]);
 215 }
 216
 217 /* show/store functions for DIMM Label attributes */
 218 static ssize_t channel_dimm_label_show(struct device *dev,
 219                                        struct device_attribute *mattr,
 220                                        char *data)
 221 {
 222         struct csrow_info *csrow = to_csrow(dev);
 223         unsigned chan = to_channel(mattr);
 224         struct rank_info *rank = csrow->channels[chan];
 225
 226         /* if field has not been initialized, there is nothing to send */
 227         if (!rank->dimm->label[0])
 228                 return 0;
 229
 230         return snprintf(data, EDAC_MC_LABEL_LEN, "%s\n",
 231                         rank->dimm->label);
 232 }
 233
 234 static ssize_t channel_dimm_label_store(struct device *dev,
 235                                         struct device_attribute *mattr,
 236                                         const char *data, size_t count)
 237 {
 238         struct csrow_info *csrow = to_csrow(dev);
 239         unsigned chan = to_channel(mattr);
 240         struct rank_info *rank = csrow->channels[chan];
 241
 242         ssize_t max_size = 0;
 243
 244         max_size = min((ssize_t) count, (ssize_t) EDAC_MC_LABEL_LEN - 1);
 245         strncpy(rank->dimm->label, data, max_size);
 246         rank->dimm->label[max_size] = '\0';
 247
 248         return max_size;
 249 }
 250
 251 /* show function for dynamic chX_ce_count attribute */
 252 static ssize_t channel_ce_count_show(struct device *dev,
 253                                      struct device_attribute *mattr, char *data)
 254 {
 255         struct csrow_info *csrow = to_csrow(dev);
 256         unsigned chan = to_channel(mattr);
 257         struct rank_info *rank = csrow->channels[chan];
 258
 259         return sprintf(data, "%u\n", rank->ce_count);
 260 }
 261
 262 /* cwrow<id>/attribute files */
 263 DEVICE_ATTR_LEGACY(size_mb, S_IRUGO, csrow_size_show, NULL);
 264 DEVICE_ATTR_LEGACY(dev_type, S_IRUGO, csrow_dev_type_show, NULL);
 265 DEVICE_ATTR_LEGACY(mem_type, S_IRUGO, csrow_mem_type_show, NULL);
 266 DEVICE_ATTR_LEGACY(edac_mode, S_IRUGO, csrow_edac_mode_show, NULL);
 267 DEVICE_ATTR_LEGACY(ue_count, S_IRUGO, csrow_ue_count_show, NULL);
 268 DEVICE_ATTR_LEGACY(ce_count, S_IRUGO, csrow_ce_count_show, NULL);
 269
 270 /* default attributes of the CSROW<id> object */
 271 static struct attribute *csrow_attrs[] = {
 272         &dev_attr_legacy_dev_type.attr,
 273         &dev_attr_legacy_mem_type.attr,
 274         &dev_attr_legacy_edac_mode.attr,
 275         &dev_attr_legacy_size_mb.attr,
 276         &dev_attr_legacy_ue_count.attr,
 277         &dev_attr_legacy_ce_count.attr,
 278         NULL,
 279 };
 280
 281 static struct attribute_group csrow_attr_grp = {
 282         .attrs  = csrow_attrs,
 283 };
 284
 285 static const struct attribute_group *csrow_attr_groups[] = {
 286         &csrow_attr_grp,
 287         NULL
 288 };
 289
 290 static void csrow_attr_release(struct device *dev)
 291 {
 292         struct csrow_info *csrow = container_of(dev, struct csrow_info, dev);
 293
 294         edac_dbg(1, "Releasing csrow device %s\n", dev_name(dev));
 295         kfree(csrow);
 296 }
 297
 298 static struct device_type csrow_attr_type = {
 299         .groups         = csrow_attr_groups,
 300         .release        = csrow_attr_release,
 301 };
 302
 303 /*
 304  * possible dynamic channel DIMM Label attribute files
 305  *
 306  */
 307
 308 #define EDAC_NR_CHANNELS        6
 309
 310 DEVICE_CHANNEL(ch0_dimm_label, S_IRUGO | S_IWUSR,
 311         channel_dimm_label_show, channel_dimm_label_store, 0);
 312 DEVICE_CHANNEL(ch1_dimm_label, S_IRUGO | S_IWUSR,
 313         channel_dimm_label_show, channel_dimm_label_store, 1);
 314 DEVICE_CHANNEL(ch2_dimm_label, S_IRUGO | S_IWUSR,
 315         channel_dimm_label_show, channel_dimm_label_store, 2);
 316 DEVICE_CHANNEL(ch3_dimm_label, S_IRUGO | S_IWUSR,
 317         channel_dimm_label_show, channel_dimm_label_store, 3);
 318 DEVICE_CHANNEL(ch4_dimm_label, S_IRUGO | S_IWUSR,
 319         channel_dimm_label_show, channel_dimm_label_store, 4);
 320 DEVICE_CHANNEL(ch5_dimm_label, S_IRUGO | S_IWUSR,
 321         channel_dimm_label_show, channel_dimm_label_store, 5);
 322
 323 /* Total possible dynamic DIMM Label attribute file table */
 324 static struct device_attribute *dynamic_csrow_dimm_attr[] = {
 325         &dev_attr_legacy_ch0_dimm_label.attr,
 326         &dev_attr_legacy_ch1_dimm_label.attr,
 327         &dev_attr_legacy_ch2_dimm_label.attr,
 328         &dev_attr_legacy_ch3_dimm_label.attr,
 329         &dev_attr_legacy_ch4_dimm_label.attr,
 330         &dev_attr_legacy_ch5_dimm_label.attr
 331 };
 332
 333 /* possible dynamic channel ce_count attribute files */
 334 DEVICE_CHANNEL(ch0_ce_count, S_IRUGO,
 335                    channel_ce_count_show, NULL, 0);
 336 DEVICE_CHANNEL(ch1_ce_count, S_IRUGO,
 337                    channel_ce_count_show, NULL, 1);
 338 DEVICE_CHANNEL(ch2_ce_count, S_IRUGO,
 339                    channel_ce_count_show, NULL, 2);
 340 DEVICE_CHANNEL(ch3_ce_count, S_IRUGO,
 341                    channel_ce_count_show, NULL, 3);
 342 DEVICE_CHANNEL(ch4_ce_count, S_IRUGO,
 343                    channel_ce_count_show, NULL, 4);
 344 DEVICE_CHANNEL(ch5_ce_count, S_IRUGO,
 345                    channel_ce_count_show, NULL, 5);
 346
 347 /* Total possible dynamic ce_count attribute file table */
 348 static struct device_attribute *dynamic_csrow_ce_count_attr[] = {
 349         &dev_attr_legacy_ch0_ce_count.attr,
 350         &dev_attr_legacy_ch1_ce_count.attr,
 351         &dev_attr_legacy_ch2_ce_count.attr,
 352         &dev_attr_legacy_ch3_ce_count.attr,
 353         &dev_attr_legacy_ch4_ce_count.attr,
 354         &dev_attr_legacy_ch5_ce_count.attr
 355 };
 356
 357 static inline int nr_pages_per_csrow(struct csrow_info *csrow)
 358 {
 359         int chan, nr_pages = 0;
 360
 361         for (chan = 0; chan < csrow->nr_channels; chan++)
 362                 nr_pages += csrow->channels[chan]->dimm->nr_pages;
 363
 364         return nr_pages;
 365 }
 366
 367 /* Create a CSROW object under specifed edac_mc_device */
 368 static int edac_create_csrow_object(struct mem_ctl_info *mci,
 369                                     struct csrow_info *csrow, int index)
 370 {
 371         int err, chan;
 372
 373         if (csrow->nr_channels >= EDAC_NR_CHANNELS)
 374                 return -ENODEV;
 375
 376         csrow->dev.type = &csrow_attr_type;
 377         csrow->dev.bus = mci->bus;
 378         device_initialize(&csrow->dev);
 379         csrow->dev.parent = &mci->dev;
 380         csrow->mci = mci;
 381         dev_set_name(&csrow->dev, "csrow%d", index);
 382         dev_set_drvdata(&csrow->dev, csrow);
 383
 384         edac_dbg(0, "creating (virtual) csrow node %s\n",
 385                  dev_name(&csrow->dev));
 386
 387         err = device_add(&csrow->dev);
 388         if (err < 0)
 389                 return err;
 390
 391         for (chan = 0; chan < csrow->nr_channels; chan++) {
 392                 /* Only expose populated DIMMs */
 393                 if (!csrow->channels[chan]->dimm->nr_pages)
 394                         continue;
 395                 err = device_create_file(&csrow->dev,
 396                                          dynamic_csrow_dimm_attr[chan]);
 397                 if (err < 0)
 398                         goto error;
 399                 err = device_create_file(&csrow->dev,
 400                                          dynamic_csrow_ce_count_attr[chan]);
 401                 if (err < 0) {
 402                         device_remove_file(&csrow->dev,
 403                                            dynamic_csrow_dimm_attr[chan]);
 404                         goto error;
 405                 }
 406         }
 407
 408         return 0;
 409
 410 error:
 411         for (--chan; chan >= 0; chan--) {
 412                 device_remove_file(&csrow->dev,
 413                                         dynamic_csrow_dimm_attr[chan]);
 414                 device_remove_file(&csrow->dev,
 415                                            dynamic_csrow_ce_count_attr[chan]);
 416         }
 417         put_device(&csrow->dev);
 418
 419         return err;
 420 }
 421
 422 /* Create a CSROW object under specifed edac_mc_device */
 423 static int edac_create_csrow_objects(struct mem_ctl_info *mci)
 424 {
 425         int err, i, chan;
 426         struct csrow_info *csrow;
 427
 428         for (i = 0; i < mci->nr_csrows; i++) {
 429                 csrow = mci->csrows[i];
 430                 if (!nr_pages_per_csrow(csrow))
 431                         continue;
 432                 err = edac_create_csrow_object(mci, mci->csrows[i], i);
 433                 if (err < 0) {
 434                         edac_dbg(1,
 435                                  "failure: create csrow objects for csrow %d\n",
 436                                  i);
 437                         goto error;
 438                 }
 439         }
 440         return 0;
 441
 442 error:
 443         for (--i; i >= 0; i--) {
 444                 csrow = mci->csrows[i];
 445                 if (!nr_pages_per_csrow(csrow))
 446                         continue;
 447                 for (chan = csrow->nr_channels - 1; chan >= 0; chan--) {
 448                         if (!csrow->channels[chan]->dimm->nr_pages)
 449                                 continue;
 450                         device_remove_file(&csrow->dev,
 451                                                 dynamic_csrow_dimm_attr[chan]);
 452                         device_remove_file(&csrow->dev,
 453                                                 dynamic_csrow_ce_count_attr[chan]);
 454                 }
 455                 put_device(&mci->csrows[i]->dev);
 456         }
 457
 458         return err;
 459 }
 460
 461 static void edac_delete_csrow_objects(struct mem_ctl_info *mci)
 462 {
 463         int i, chan;
 464         struct csrow_info *csrow;
 465
 466         for (i = mci->nr_csrows - 1; i >= 0; i--) {
 467                 csrow = mci->csrows[i];
 468                 if (!nr_pages_per_csrow(csrow))
 469                         continue;
 470                 for (chan = csrow->nr_channels - 1; chan >= 0; chan--) {
 471                         if (!csrow->channels[chan]->dimm->nr_pages)
 472                                 continue;
 473                         edac_dbg(1, "Removing csrow %d channel %d sysfs nodes\n",
 474                                  i, chan);
 475                         device_remove_file(&csrow->dev,
 476                                                 dynamic_csrow_dimm_attr[chan]);
 477                         device_remove_file(&csrow->dev,
 478                                                 dynamic_csrow_ce_count_attr[chan]);
 479                 }
 480                 device_unregister(&mci->csrows[i]->dev);
 481         }
 482 }
 483 #endif
 484
 485 /*
 486  * Per-dimm (or per-rank) devices
 487  */
 488
 489 #define to_dimm(k) container_of(k, struct dimm_info, dev)
 490
 491 /* show/store functions for DIMM Label attributes */
 492 static ssize_t dimmdev_location_show(struct device *dev,
 493                                      struct device_attribute *mattr, char *data)
 494 {
 495         struct dimm_info *dimm = to_dimm(dev);
 496
 497         return edac_dimm_info_location(dimm, data, PAGE_SIZE);
 498 }
 499
 500 static ssize_t dimmdev_label_show(struct device *dev,
 501                                   struct device_attribute *mattr, char *data)
 502 {
 503         struct dimm_info *dimm = to_dimm(dev);
 504
 505         /* if field has not been initialized, there is nothing to send */
 506         if (!dimm->label[0])
 507                 return 0;
 508
 509         return snprintf(data, EDAC_MC_LABEL_LEN, "%s\n", dimm->label);
 510 }
 511
 512 static ssize_t dimmdev_label_store(struct device *dev,
 513                                    struct device_attribute *mattr,
 514                                    const char *data,
 515                                    size_t count)
 516 {
 517         struct dimm_info *dimm = to_dimm(dev);
 518
 519         ssize_t max_size = 0;
 520
 521         max_size = min((ssize_t) count, (ssize_t) EDAC_MC_LABEL_LEN - 1);
 522         strncpy(dimm->label, data, max_size);
 523         dimm->label[max_size] = '\0';
 524
 525         return max_size;
 526 }
 527
 528 static ssize_t dimmdev_size_show(struct device *dev,
 529                                  struct device_attribute *mattr, char *data)
 530 {
 531         struct dimm_info *dimm = to_dimm(dev);
 532
 533         return sprintf(data, "%u\n", PAGES_TO_MiB(dimm->nr_pages));
 534 }
 535
 536 static ssize_t dimmdev_mem_type_show(struct device *dev,
 537                                      struct device_attribute *mattr, char *data)
 538 {
 539         struct dimm_info *dimm = to_dimm(dev);
 540
 541         return sprintf(data, "%s\n", mem_types[dimm->mtype]);
 542 }
 543
 544 static ssize_t dimmdev_dev_type_show(struct device *dev,
 545                                      struct device_attribute *mattr, char *data)
 546 {
 547         struct dimm_info *dimm = to_dimm(dev);
 548
 549         return sprintf(data, "%s\n", dev_types[dimm->dtype]);
 550 }
 551
 552 static ssize_t dimmdev_edac_mode_show(struct device *dev,
 553                                       struct device_attribute *mattr,
 554                                       char *data)
 555 {
 556         struct dimm_info *dimm = to_dimm(dev);
 557
 558         return sprintf(data, "%s\n", edac_caps[dimm->edac_mode]);
 559 }
 560
 561 /* dimm/rank attribute files */
 562 static DEVICE_ATTR(dimm_label, S_IRUGO | S_IWUSR,
 563                    dimmdev_label_show, dimmdev_label_store);
 564 static DEVICE_ATTR(dimm_location, S_IRUGO, dimmdev_location_show, NULL);
 565 static DEVICE_ATTR(size, S_IRUGO, dimmdev_size_show, NULL);
 566 static DEVICE_ATTR(dimm_mem_type, S_IRUGO, dimmdev_mem_type_show, NULL);
 567 static DEVICE_ATTR(dimm_dev_type, S_IRUGO, dimmdev_dev_type_show, NULL);
 568 static DEVICE_ATTR(dimm_edac_mode, S_IRUGO, dimmdev_edac_mode_show, NULL);
 569
 570 /* attributes of the dimm<id>/rank<id> object */
 571 static struct attribute *dimm_attrs[] = {
 572         &dev_attr_dimm_label.attr,
 573         &dev_attr_dimm_location.attr,
 574         &dev_attr_size.attr,
 575         &dev_attr_dimm_mem_type.attr,
 576         &dev_attr_dimm_dev_type.attr,
 577         &dev_attr_dimm_edac_mode.attr,
 578         NULL,
 579 };
 580
 581 static struct attribute_group dimm_attr_grp = {
 582         .attrs  = dimm_attrs,
 583 };
 584
 585 static const struct attribute_group *dimm_attr_groups[] = {
 586         &dimm_attr_grp,
 587         NULL
 588 };
 589
 590 static void dimm_attr_release(struct device *dev)
 591 {
 592         struct dimm_info *dimm = container_of(dev, struct dimm_info, dev);
 593
 594         edac_dbg(1, "Releasing dimm device %s\n", dev_name(dev));
 595         kfree(dimm);
 596 }
 597
 598 static struct device_type dimm_attr_type = {
 599         .groups         = dimm_attr_groups,
 600         .release        = dimm_attr_release,
 601 };
 602
 603 /* Create a DIMM object under specifed memory controller device */
 604 static int edac_create_dimm_object(struct mem_ctl_info *mci,
 605                                    struct dimm_info *dimm,
 606                                    int index)
 607 {
 608         int err;
 609         dimm->mci = mci;
 610
 611         dimm->dev.type = &dimm_attr_type;
 612         dimm->dev.bus = mci->bus;
 613         device_initialize(&dimm->dev);
 614
 615         dimm->dev.parent = &mci->dev;
 616         if (mci->csbased)
 617                 dev_set_name(&dimm->dev, "rank%d", index);
 618         else
 619                 dev_set_name(&dimm->dev, "dimm%d", index);
 620         dev_set_drvdata(&dimm->dev, dimm);
 621         pm_runtime_forbid(&mci->dev);
 622
 623         err =  device_add(&dimm->dev);
 624
 625         edac_dbg(0, "creating rank/dimm device %s\n", dev_name(&dimm->dev));
 626
 627         return err;
 628 }
 629
 630 /*
 631  * Memory controller device
 632  */
 633
 634 #define to_mci(k) container_of(k, struct mem_ctl_info, dev)
 635
 636 static ssize_t mci_reset_counters_store(struct device *dev,
 637                                         struct device_attribute *mattr,
 638                                         const char *data, size_t count)
 639 {
 640         struct mem_ctl_info *mci = to_mci(dev);
 641         int cnt, row, chan, i;
 642         mci->ue_mc = 0;
 643         mci->ce_mc = 0;
 644         mci->ue_noinfo_count = 0;
 645         mci->ce_noinfo_count = 0;
 646
 647         for (row = 0; row < mci->nr_csrows; row++) {
 648                 struct csrow_info *ri = mci->csrows[row];
 649
 650                 ri->ue_count = 0;
 651                 ri->ce_count = 0;
 652
 653                 for (chan = 0; chan < ri->nr_channels; chan++)
 654                         ri->channels[chan]->ce_count = 0;
 655         }
 656
 657         cnt = 1;
 658         for (i = 0; i < mci->n_layers; i++) {
 659                 cnt *= mci->layers[i].size;
 660                 memset(mci->ce_per_layer[i], 0, cnt * sizeof(u32));
 661                 memset(mci->ue_per_layer[i], 0, cnt * sizeof(u32));
 662         }
 663
 664         mci->start_time = jiffies;
 665         return count;
 666 }
 667
 668 /* Memory scrubbing interface:
 669  *
 670  * A MC driver can limit the scrubbing bandwidth based on the CPU type.
 671  * Therefore, ->set_sdram_scrub_rate should be made to return the actual
 672  * bandwidth that is accepted or 0 when scrubbing is to be disabled.
 673  *
 674  * Negative value still means that an error has occurred while setting
 675  * the scrub rate.
 676  */
 677 static ssize_t mci_sdram_scrub_rate_store(struct device *dev,
 678                                           struct device_attribute *mattr,
 679                                           const char *data, size_t count)
 680 {
 681         struct mem_ctl_info *mci = to_mci(dev);
 682         unsigned long bandwidth = 0;
 683         int new_bw = 0;
 684
 685         if (kstrtoul(data, 10, &bandwidth) < 0)
 686                 return -EINVAL;
 687
 688         new_bw = mci->set_sdram_scrub_rate(mci, bandwidth);
 689         if (new_bw < 0) {
 690                 edac_printk(KERN_WARNING, EDAC_MC,
 691                             "Error setting scrub rate to: %lu\n", bandwidth);
 692                 return -EINVAL;
 693         }
 694
 695         return count;
 696 }
 697
 698 /*
 699  * ->get_sdram_scrub_rate() return value semantics same as above.
 700  */
 701 static ssize_t mci_sdram_scrub_rate_show(struct device *dev,
 702                                          struct device_attribute *mattr,
 703                                          char *data)
 704 {
 705         struct mem_ctl_info *mci = to_mci(dev);
 706         int bandwidth = 0;
 707
 708         bandwidth = mci->get_sdram_scrub_rate(mci);
 709         if (bandwidth < 0) {
 710                 edac_printk(KERN_DEBUG, EDAC_MC, "Error reading scrub rate\n");
 711                 return bandwidth;
 712         }
 713
 714         return sprintf(data, "%d\n", bandwidth);
 715 }
 716
 717 /* default attribute files for the MCI object */
 718 static ssize_t mci_ue_count_show(struct device *dev,
 719                                  struct device_attribute *mattr,
 720                                  char *data)
 721 {
 722         struct mem_ctl_info *mci = to_mci(dev);
 723
 724         return sprintf(data, "%d\n", mci->ue_mc);
 725 }
 726
 727 static ssize_t mci_ce_count_show(struct device *dev,
 728                                  struct device_attribute *mattr,
 729                                  char *data)
 730 {
 731         struct mem_ctl_info *mci = to_mci(dev);
 732
 733         return sprintf(data, "%d\n", mci->ce_mc);
 734 }
 735
 736 static ssize_t mci_ce_noinfo_show(struct device *dev,
 737                                   struct device_attribute *mattr,
 738                                   char *data)
 739 {
 740         struct mem_ctl_info *mci = to_mci(dev);
 741
 742         return sprintf(data, "%d\n", mci->ce_noinfo_count);
 743 }
 744
 745 static ssize_t mci_ue_noinfo_show(struct device *dev,
 746                                   struct device_attribute *mattr,
 747                                   char *data)
 748 {
 749         struct mem_ctl_info *mci = to_mci(dev);
 750
 751         return sprintf(data, "%d\n", mci->ue_noinfo_count);
 752 }
 753
 754 static ssize_t mci_seconds_show(struct device *dev,
 755                                 struct device_attribute *mattr,
 756                                 char *data)
 757 {
 758         struct mem_ctl_info *mci = to_mci(dev);
 759
 760         return sprintf(data, "%ld\n", (jiffies - mci->start_time) / HZ);
 761 }
 762
 763 static ssize_t mci_ctl_name_show(struct device *dev,
 764                                  struct device_attribute *mattr,
 765                                  char *data)
 766 {
 767         struct mem_ctl_info *mci = to_mci(dev);
 768
 769         return sprintf(data, "%s\n", mci->ctl_name);
 770 }
 771
 772 static ssize_t mci_size_mb_show(struct device *dev,
 773                                 struct device_attribute *mattr,
 774                                 char *data)
 775 {
 776         struct mem_ctl_info *mci = to_mci(dev);
 777         int total_pages = 0, csrow_idx, j;
 778
 779         for (csrow_idx = 0; csrow_idx < mci->nr_csrows; csrow_idx++) {
 780                 struct csrow_info *csrow = mci->csrows[csrow_idx];
 781
 782                 for (j = 0; j < csrow->nr_channels; j++) {
 783                         struct dimm_info *dimm = csrow->channels[j]->dimm;
 784
 785                         total_pages += dimm->nr_pages;
 786                 }
 787         }
 788
 789         return sprintf(data, "%u\n", PAGES_TO_MiB(total_pages));
 790 }
 791
 792 static ssize_t mci_max_location_show(struct device *dev,
 793                                      struct device_attribute *mattr,
 794                                      char *data)
 795 {
 796         struct mem_ctl_info *mci = to_mci(dev);
 797         int i;
 798         char *p = data;
 799
 800         for (i = 0; i < mci->n_layers; i++) {
 801                 p += sprintf(p, "%s %d ",
 802                              edac_layer_name[mci->layers[i].type],
 803                              mci->layers[i].size - 1);
 804         }
 805
 806         return p - data;
 807 }
 808
 809 #ifdef CONFIG_EDAC_DEBUG
 810 static ssize_t edac_fake_inject_write(struct file *file,
 811                                       const char __user *data,
 812                                       size_t count, loff_t *ppos)
 813 {
 814         struct device *dev = file->private_data;
 815         struct mem_ctl_info *mci = to_mci(dev);
 816         static enum hw_event_mc_err_type type;
 817         u16 errcount = mci->fake_inject_count;
 818
 819         if (!errcount)
 820                 errcount = 1;
 821
 822         type = mci->fake_inject_ue ? HW_EVENT_ERR_UNCORRECTED
 823                                    : HW_EVENT_ERR_CORRECTED;
 824
 825         printk(KERN_DEBUG
 826                "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",
 827                 errcount,
 828                 (type == HW_EVENT_ERR_UNCORRECTED) ? "UE" : "CE",
 829                 errcount > 1 ? "s" : "",
 830                 mci->fake_inject_layer[0],
 831                 mci->fake_inject_layer[1],
 832                 mci->fake_inject_layer[2]
 833                );
 834         edac_mc_handle_error(type, mci, errcount, 0, 0, 0,
 835                              mci->fake_inject_layer[0],
 836                              mci->fake_inject_layer[1],
 837                              mci->fake_inject_layer[2],
 838                              "FAKE ERROR", "for EDAC testing only");
 839
 840         return count;
 841 }
 842
 843 static const struct file_operations debug_fake_inject_fops = {
 844         .open = simple_open,
 845         .write = edac_fake_inject_write,
 846         .llseek = generic_file_llseek,
 847 };
 848 #endif
 849
 850 /* default Control file */
 851 DEVICE_ATTR(reset_counters, S_IWUSR, NULL, mci_reset_counters_store);
 852
 853 /* default Attribute files */
 854 DEVICE_ATTR(mc_name, S_IRUGO, mci_ctl_name_show, NULL);
 855 DEVICE_ATTR(size_mb, S_IRUGO, mci_size_mb_show, NULL);
 856 DEVICE_ATTR(seconds_since_reset, S_IRUGO, mci_seconds_show, NULL);
 857 DEVICE_ATTR(ue_noinfo_count, S_IRUGO, mci_ue_noinfo_show, NULL);
 858 DEVICE_ATTR(ce_noinfo_count, S_IRUGO, mci_ce_noinfo_show, NULL);
 859 DEVICE_ATTR(ue_count, S_IRUGO, mci_ue_count_show, NULL);
 860 DEVICE_ATTR(ce_count, S_IRUGO, mci_ce_count_show, NULL);
 861 DEVICE_ATTR(max_location, S_IRUGO, mci_max_location_show, NULL);
 862
 863 /* memory scrubber attribute file */
 864 DEVICE_ATTR(sdram_scrub_rate, 0, NULL, NULL);
 865
 866 static struct attribute *mci_attrs[] = {
 867         &dev_attr_reset_counters.attr,
 868         &dev_attr_mc_name.attr,
 869         &dev_attr_size_mb.attr,
 870         &dev_attr_seconds_since_reset.attr,
 871         &dev_attr_ue_noinfo_count.attr,
 872         &dev_attr_ce_noinfo_count.attr,
 873         &dev_attr_ue_count.attr,
 874         &dev_attr_ce_count.attr,
 875         &dev_attr_max_location.attr,
 876         NULL
 877 };
 878
 879 static struct attribute_group mci_attr_grp = {
 880         .attrs  = mci_attrs,
 881 };
 882
 883 static const struct attribute_group *mci_attr_groups[] = {
 884         &mci_attr_grp,
 885         NULL
 886 };
 887
 888 static void mci_attr_release(struct device *dev)
 889 {
 890         struct mem_ctl_info *mci = container_of(dev, struct mem_ctl_info, dev);
 891
 892         edac_dbg(1, "Releasing csrow device %s\n", dev_name(dev));
 893         kfree(mci);
 894 }
 895
 896 static struct device_type mci_attr_type = {
 897         .groups         = mci_attr_groups,
 898         .release        = mci_attr_release,
 899 };
 900
 901 #ifdef CONFIG_EDAC_DEBUG
 902 static struct dentry *edac_debugfs;
 903
 904 int __init edac_debugfs_init(void)
 905 {
 906         edac_debugfs = debugfs_create_dir("edac", NULL);
 907         if (IS_ERR(edac_debugfs)) {
 908                 edac_debugfs = NULL;
 909                 return -ENOMEM;
 910         }
 911         return 0;
 912 }
 913
 914 void __exit edac_debugfs_exit(void)
 915 {
 916         debugfs_remove(edac_debugfs);
 917 }
 918
 919 int edac_create_debug_nodes(struct mem_ctl_info *mci)
 920 {
 921         struct dentry *d, *parent;
 922         char name[80];
 923         int i;
 924
 925         if (!edac_debugfs)
 926                 return -ENODEV;
 927
 928         d = debugfs_create_dir(mci->dev.kobj.name, edac_debugfs);
 929         if (!d)
 930                 return -ENOMEM;
 931         parent = d;
 932
 933         for (i = 0; i < mci->n_layers; i++) {
 934                 sprintf(name, "fake_inject_%s",
 935                              edac_layer_name[mci->layers[i].type]);
 936                 d = debugfs_create_u8(name, S_IRUGO | S_IWUSR, parent,
 937                                       &mci->fake_inject_layer[i]);
 938                 if (!d)
 939                         goto nomem;
 940         }
 941
 942         d = debugfs_create_bool("fake_inject_ue", S_IRUGO | S_IWUSR, parent,
 943                                 &mci->fake_inject_ue);
 944         if (!d)
 945                 goto nomem;
 946
 947         d = debugfs_create_u16("fake_inject_count", S_IRUGO | S_IWUSR, parent,
 948                                 &mci->fake_inject_count);
 949         if (!d)
 950                 goto nomem;
 951
 952         d = debugfs_create_file("fake_inject", S_IWUSR, parent,
 953                                 &mci->dev,
 954                                 &debug_fake_inject_fops);
 955         if (!d)
 956                 goto nomem;
 957
 958         mci->debugfs = parent;
 959         return 0;
 960 nomem:
 961         debugfs_remove(mci->debugfs);
 962         return -ENOMEM;
 963 }
 964 #endif
 965
 966 /*
 967  * Create a new Memory Controller kobject instance,
 968  *      mc<id> under the 'mc' directory
 969  *
 970  * Return:
 971  *      0       Success
 972  *      !0      Failure
 973  */
 974 int edac_create_sysfs_mci_device(struct mem_ctl_info *mci)
 975 {
 976         int i, err;
 977
 978         /*
 979          * The memory controller needs its own bus, in order to avoid
 980          * namespace conflicts at /sys/bus/edac.
 981          */
 982         mci->bus->name = kasprintf(GFP_KERNEL, "mc%d", mci->mc_idx);
 983         if (!mci->bus->name)
 984                 return -ENOMEM;
 985
 986         edac_dbg(0, "creating bus %s\n", mci->bus->name);
 987
 988         err = bus_register(mci->bus);
 989         if (err < 0)
 990                 return err;
 991
 992         /* get the /sys/devices/system/edac subsys reference */
 993         mci->dev.type = &mci_attr_type;
 994         device_initialize(&mci->dev);
 995
 996         mci->dev.parent = mci_pdev;
 997         mci->dev.bus = mci->bus;
 998         dev_set_name(&mci->dev, "mc%d", mci->mc_idx);
 999         dev_set_drvdata(&mci->dev, mci);
1000         pm_runtime_forbid(&mci->dev);
1001
1002         edac_dbg(0, "creating device %s\n", dev_name(&mci->dev));
1003         err = device_add(&mci->dev);
1004         if (err < 0) {
1005                 edac_dbg(1, "failure: create device %s\n", dev_name(&mci->dev));
1006                 bus_unregister(mci->bus);
1007                 kfree(mci->bus->name);
1008                 return err;
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                 if (mci->set_sdram_scrub_rate) {
1017                         dev_attr_sdram_scrub_rate.attr.mode |= S_IWUSR;
1018                         dev_attr_sdram_scrub_rate.store = &mci_sdram_scrub_rate_store;
1019                 }
1020                 err = device_create_file(&mci->dev,
1021                                          &dev_attr_sdram_scrub_rate);
1022                 if (err) {
1023                         edac_dbg(1, "failure: create sdram_scrub_rate\n");
1024                         goto fail2;
1025                 }
1026         }
1027         /*
1028          * Create the dimm/rank devices
1029          */
1030         for (i = 0; i < mci->tot_dimms; i++) {
1031                 struct dimm_info *dimm = mci->dimms[i];
1032                 /* Only expose populated DIMMs */
1033                 if (dimm->nr_pages == 0)
1034                         continue;
1035 #ifdef CONFIG_EDAC_DEBUG
1036                 edac_dbg(1, "creating dimm%d, located at ", i);
1037                 if (edac_debug_level >= 1) {
1038                         int lay;
1039                         for (lay = 0; lay < mci->n_layers; lay++)
1040                                 printk(KERN_CONT "%s %d ",
1041                                         edac_layer_name[mci->layers[lay].type],
1042                                         dimm->location[lay]);
1043                         printk(KERN_CONT "\n");
1044                 }
1045 #endif
1046                 err = edac_create_dimm_object(mci, dimm, i);
1047                 if (err) {
1048                         edac_dbg(1, "failure: create dimm %d obj\n", i);
1049                         goto fail;
1050                 }
1051         }
1052
1053 #ifdef CONFIG_EDAC_LEGACY_SYSFS
1054         err = edac_create_csrow_objects(mci);
1055         if (err < 0)
1056                 goto fail;
1057 #endif
1058
1059 #ifdef CONFIG_EDAC_DEBUG
1060         edac_create_debug_nodes(mci);
1061 #endif
1062         return 0;
1063
1064 fail:
1065         for (i--; i >= 0; i--) {
1066                 struct dimm_info *dimm = mci->dimms[i];
1067                 if (dimm->nr_pages == 0)
1068                         continue;
1069                 device_unregister(&dimm->dev);
1070         }
1071 fail2:
1072         device_unregister(&mci->dev);
1073         bus_unregister(mci->bus);
1074         kfree(mci->bus->name);
1075         return err;
1076 }
1077
1078 /*
1079  * remove a Memory Controller instance
1080  */
1081 void edac_remove_sysfs_mci_device(struct mem_ctl_info *mci)
1082 {
1083         int i;
1084
1085         edac_dbg(0, "\n");
1086
1087 #ifdef CONFIG_EDAC_DEBUG
1088         debugfs_remove(mci->debugfs);
1089 #endif
1090 #ifdef CONFIG_EDAC_LEGACY_SYSFS
1091         edac_delete_csrow_objects(mci);
1092 #endif
1093
1094         for (i = 0; i < mci->tot_dimms; i++) {
1095                 struct dimm_info *dimm = mci->dimms[i];
1096                 if (dimm->nr_pages == 0)
1097                         continue;
1098                 edac_dbg(0, "removing device %s\n", dev_name(&dimm->dev));
1099                 device_unregister(&dimm->dev);
1100         }
1101 }
1102
1103 void edac_unregister_sysfs(struct mem_ctl_info *mci)
1104 {
1105         edac_dbg(1, "Unregistering device %s\n", dev_name(&mci->dev));
1106         device_unregister(&mci->dev);
1107         bus_unregister(mci->bus);
1108         kfree(mci->bus->name);
1109 }
1110
1111 static void mc_attr_release(struct device *dev)
1112 {
1113         /*
1114          * There's no container structure here, as this is just the mci
1115          * parent device, used to create the /sys/devices/mc sysfs node.
1116          * So, there are no attributes on it.
1117          */
1118         edac_dbg(1, "Releasing device %s\n", dev_name(dev));
1119         kfree(dev);
1120 }
1121
1122 static struct device_type mc_attr_type = {
1123         .release        = mc_attr_release,
1124 };
1125 /*
1126  * Init/exit code for the module. Basically, creates/removes /sys/class/rc
1127  */
1128 int __init edac_mc_sysfs_init(void)
1129 {
1130         struct bus_type *edac_subsys;
1131         int err;
1132
1133         /* get the /sys/devices/system/edac subsys reference */
1134         edac_subsys = edac_get_sysfs_subsys();
1135         if (edac_subsys == NULL) {
1136                 edac_dbg(1, "no edac_subsys\n");
1137                 err = -EINVAL;
1138                 goto out;
1139         }
1140
1141         mci_pdev = kzalloc(sizeof(*mci_pdev), GFP_KERNEL);
1142         if (!mci_pdev) {
1143                 err = -ENOMEM;
1144                 goto out_put_sysfs;
1145         }
1146
1147         mci_pdev->bus = edac_subsys;
1148         mci_pdev->type = &mc_attr_type;
1149         device_initialize(mci_pdev);
1150         dev_set_name(mci_pdev, "mc");
1151
1152         err = device_add(mci_pdev);
1153         if (err < 0)
1154                 goto out_dev_free;
1155
1156         edac_dbg(0, "device %s created\n", dev_name(mci_pdev));
1157
1158         return 0;
1159
1160  out_dev_free:
1161         kfree(mci_pdev);
1162  out_put_sysfs:
1163         edac_put_sysfs_subsys();
1164  out:
1165         return err;
1166 }
1167
1168 void __exit edac_mc_sysfs_exit(void)
1169 {
1170         device_unregister(mci_pdev);
1171         edac_put_sysfs_subsys();
1172 }