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         static 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         for (i = 0; i < csrow->nr_channels; i++)
 184                 nr_pages += csrow->channels[i]->dimm->nr_pages;
 185         return sprintf(data, "%u\n", PAGES_TO_MiB(nr_pages));
 186 }
 187
 188 static ssize_t csrow_mem_type_show(struct device *dev,
 189                                    struct device_attribute *mattr, char *data)
 190 {
 191         struct csrow_info *csrow = to_csrow(dev);
 192
 193         return sprintf(data, "%s\n", mem_types[csrow->channels[0]->dimm->mtype]);
 194 }
 195
 196 static ssize_t csrow_dev_type_show(struct device *dev,
 197                                    struct device_attribute *mattr, char *data)
 198 {
 199         struct csrow_info *csrow = to_csrow(dev);
 200
 201         return sprintf(data, "%s\n", dev_types[csrow->channels[0]->dimm->dtype]);
 202 }
 203
 204 static ssize_t csrow_edac_mode_show(struct device *dev,
 205                                     struct device_attribute *mattr,
 206                                     char *data)
 207 {
 208         struct csrow_info *csrow = to_csrow(dev);
 209
 210         return sprintf(data, "%s\n", edac_caps[csrow->channels[0]->dimm->edac_mode]);
 211 }
 212
 213 /* show/store functions for DIMM Label attributes */
 214 static ssize_t channel_dimm_label_show(struct device *dev,
 215                                        struct device_attribute *mattr,
 216                                        char *data)
 217 {
 218         struct csrow_info *csrow = to_csrow(dev);
 219         unsigned chan = to_channel(mattr);
 220         struct rank_info *rank = csrow->channels[chan];
 221
 222         /* if field has not been initialized, there is nothing to send */
 223         if (!rank->dimm->label[0])
 224                 return 0;
 225
 226         return snprintf(data, EDAC_MC_LABEL_LEN, "%s\n",
 227                         rank->dimm->label);
 228 }
 229
 230 static ssize_t channel_dimm_label_store(struct device *dev,
 231                                         struct device_attribute *mattr,
 232                                         const char *data, size_t count)
 233 {
 234         struct csrow_info *csrow = to_csrow(dev);
 235         unsigned chan = to_channel(mattr);
 236         struct rank_info *rank = csrow->channels[chan];
 237
 238         ssize_t max_size = 0;
 239
 240         max_size = min((ssize_t) count, (ssize_t) EDAC_MC_LABEL_LEN - 1);
 241         strncpy(rank->dimm->label, data, max_size);
 242         rank->dimm->label[max_size] = '\0';
 243
 244         return max_size;
 245 }
 246
 247 /* show function for dynamic chX_ce_count attribute */
 248 static ssize_t channel_ce_count_show(struct device *dev,
 249                                      struct device_attribute *mattr, char *data)
 250 {
 251         struct csrow_info *csrow = to_csrow(dev);
 252         unsigned chan = to_channel(mattr);
 253         struct rank_info *rank = csrow->channels[chan];
 254
 255         return sprintf(data, "%u\n", rank->ce_count);
 256 }
 257
 258 /* cwrow<id>/attribute files */
 259 DEVICE_ATTR_LEGACY(size_mb, S_IRUGO, csrow_size_show, NULL);
 260 DEVICE_ATTR_LEGACY(dev_type, S_IRUGO, csrow_dev_type_show, NULL);
 261 DEVICE_ATTR_LEGACY(mem_type, S_IRUGO, csrow_mem_type_show, NULL);
 262 DEVICE_ATTR_LEGACY(edac_mode, S_IRUGO, csrow_edac_mode_show, NULL);
 263 DEVICE_ATTR_LEGACY(ue_count, S_IRUGO, csrow_ue_count_show, NULL);
 264 DEVICE_ATTR_LEGACY(ce_count, S_IRUGO, csrow_ce_count_show, NULL);
 265
 266 /* default attributes of the CSROW<id> object */
 267 static struct attribute *csrow_attrs[] = {
 268         &dev_attr_legacy_dev_type.attr,
 269         &dev_attr_legacy_mem_type.attr,
 270         &dev_attr_legacy_edac_mode.attr,
 271         &dev_attr_legacy_size_mb.attr,
 272         &dev_attr_legacy_ue_count.attr,
 273         &dev_attr_legacy_ce_count.attr,
 274         NULL,
 275 };
 276
 277 static struct attribute_group csrow_attr_grp = {
 278         .attrs  = csrow_attrs,
 279 };
 280
 281 static const struct attribute_group *csrow_attr_groups[] = {
 282         &csrow_attr_grp,
 283         NULL
 284 };
 285
 286 static void csrow_attr_release(struct device *dev)
 287 {
 288         struct csrow_info *csrow = container_of(dev, struct csrow_info, dev);
 289
 290         edac_dbg(1, "Releasing csrow device %s\n", dev_name(dev));
 291         kfree(csrow);
 292 }
 293
 294 static struct device_type csrow_attr_type = {
 295         .groups         = csrow_attr_groups,
 296         .release        = csrow_attr_release,
 297 };
 298
 299 /*
 300  * possible dynamic channel DIMM Label attribute files
 301  *
 302  */
 303
 304 #define EDAC_NR_CHANNELS        6
 305
 306 DEVICE_CHANNEL(ch0_dimm_label, S_IRUGO | S_IWUSR,
 307         channel_dimm_label_show, channel_dimm_label_store, 0);
 308 DEVICE_CHANNEL(ch1_dimm_label, S_IRUGO | S_IWUSR,
 309         channel_dimm_label_show, channel_dimm_label_store, 1);
 310 DEVICE_CHANNEL(ch2_dimm_label, S_IRUGO | S_IWUSR,
 311         channel_dimm_label_show, channel_dimm_label_store, 2);
 312 DEVICE_CHANNEL(ch3_dimm_label, S_IRUGO | S_IWUSR,
 313         channel_dimm_label_show, channel_dimm_label_store, 3);
 314 DEVICE_CHANNEL(ch4_dimm_label, S_IRUGO | S_IWUSR,
 315         channel_dimm_label_show, channel_dimm_label_store, 4);
 316 DEVICE_CHANNEL(ch5_dimm_label, S_IRUGO | S_IWUSR,
 317         channel_dimm_label_show, channel_dimm_label_store, 5);
 318
 319 /* Total possible dynamic DIMM Label attribute file table */
 320 static struct device_attribute *dynamic_csrow_dimm_attr[] = {
 321         &dev_attr_legacy_ch0_dimm_label.attr,
 322         &dev_attr_legacy_ch1_dimm_label.attr,
 323         &dev_attr_legacy_ch2_dimm_label.attr,
 324         &dev_attr_legacy_ch3_dimm_label.attr,
 325         &dev_attr_legacy_ch4_dimm_label.attr,
 326         &dev_attr_legacy_ch5_dimm_label.attr
 327 };
 328
 329 /* possible dynamic channel ce_count attribute files */
 330 DEVICE_CHANNEL(ch0_ce_count, S_IRUGO | S_IWUSR,
 331                    channel_ce_count_show, NULL, 0);
 332 DEVICE_CHANNEL(ch1_ce_count, S_IRUGO | S_IWUSR,
 333                    channel_ce_count_show, NULL, 1);
 334 DEVICE_CHANNEL(ch2_ce_count, S_IRUGO | S_IWUSR,
 335                    channel_ce_count_show, NULL, 2);
 336 DEVICE_CHANNEL(ch3_ce_count, S_IRUGO | S_IWUSR,
 337                    channel_ce_count_show, NULL, 3);
 338 DEVICE_CHANNEL(ch4_ce_count, S_IRUGO | S_IWUSR,
 339                    channel_ce_count_show, NULL, 4);
 340 DEVICE_CHANNEL(ch5_ce_count, S_IRUGO | S_IWUSR,
 341                    channel_ce_count_show, NULL, 5);
 342
 343 /* Total possible dynamic ce_count attribute file table */
 344 static struct device_attribute *dynamic_csrow_ce_count_attr[] = {
 345         &dev_attr_legacy_ch0_ce_count.attr,
 346         &dev_attr_legacy_ch1_ce_count.attr,
 347         &dev_attr_legacy_ch2_ce_count.attr,
 348         &dev_attr_legacy_ch3_ce_count.attr,
 349         &dev_attr_legacy_ch4_ce_count.attr,
 350         &dev_attr_legacy_ch5_ce_count.attr
 351 };
 352
 353 static inline int nr_pages_per_csrow(struct csrow_info *csrow)
 354 {
 355         int chan, nr_pages = 0;
 356
 357         for (chan = 0; chan < csrow->nr_channels; chan++)
 358                 nr_pages += csrow->channels[chan]->dimm->nr_pages;
 359
 360         return nr_pages;
 361 }
 362
 363 /* Create a CSROW object under specifed edac_mc_device */
 364 static int edac_create_csrow_object(struct mem_ctl_info *mci,
 365                                     struct csrow_info *csrow, int index)
 366 {
 367         int err, chan;
 368
 369         if (csrow->nr_channels >= EDAC_NR_CHANNELS)
 370                 return -ENODEV;
 371
 372         csrow->dev.type = &csrow_attr_type;
 373         csrow->dev.bus = &mci->bus;
 374         device_initialize(&csrow->dev);
 375         csrow->dev.parent = &mci->dev;
 376         csrow->mci = mci;
 377         dev_set_name(&csrow->dev, "csrow%d", index);
 378         dev_set_drvdata(&csrow->dev, csrow);
 379
 380         edac_dbg(0, "creating (virtual) csrow node %s\n",
 381                  dev_name(&csrow->dev));
 382
 383         err = device_add(&csrow->dev);
 384         if (err < 0)
 385                 return err;
 386
 387         for (chan = 0; chan < csrow->nr_channels; chan++) {
 388                 /* Only expose populated DIMMs */
 389                 if (!csrow->channels[chan]->dimm->nr_pages)
 390                         continue;
 391                 err = device_create_file(&csrow->dev,
 392                                          dynamic_csrow_dimm_attr[chan]);
 393                 if (err < 0)
 394                         goto error;
 395                 err = device_create_file(&csrow->dev,
 396                                          dynamic_csrow_ce_count_attr[chan]);
 397                 if (err < 0) {
 398                         device_remove_file(&csrow->dev,
 399                                            dynamic_csrow_dimm_attr[chan]);
 400                         goto error;
 401                 }
 402         }
 403
 404         return 0;
 405
 406 error:
 407         for (--chan; chan >= 0; chan--) {
 408                 device_remove_file(&csrow->dev,
 409                                         dynamic_csrow_dimm_attr[chan]);
 410                 device_remove_file(&csrow->dev,
 411                                            dynamic_csrow_ce_count_attr[chan]);
 412         }
 413         put_device(&csrow->dev);
 414
 415         return err;
 416 }
 417
 418 /* Create a CSROW object under specifed edac_mc_device */
 419 static int edac_create_csrow_objects(struct mem_ctl_info *mci)
 420 {
 421         int err, i, chan;
 422         struct csrow_info *csrow;
 423
 424         for (i = 0; i < mci->nr_csrows; i++) {
 425                 csrow = mci->csrows[i];
 426                 if (!nr_pages_per_csrow(csrow))
 427                         continue;
 428                 err = edac_create_csrow_object(mci, mci->csrows[i], i);
 429                 if (err < 0) {
 430                         edac_dbg(1,
 431                                  "failure: create csrow objects for csrow %d\n",
 432                                  i);
 433                         goto error;
 434                 }
 435         }
 436         return 0;
 437
 438 error:
 439         for (--i; i >= 0; i--) {
 440                 csrow = mci->csrows[i];
 441                 if (!nr_pages_per_csrow(csrow))
 442                         continue;
 443                 for (chan = csrow->nr_channels - 1; chan >= 0; chan--) {
 444                         if (!csrow->channels[chan]->dimm->nr_pages)
 445                                 continue;
 446                         device_remove_file(&csrow->dev,
 447                                                 dynamic_csrow_dimm_attr[chan]);
 448                         device_remove_file(&csrow->dev,
 449                                                 dynamic_csrow_ce_count_attr[chan]);
 450                 }
 451                 put_device(&mci->csrows[i]->dev);
 452         }
 453
 454         return err;
 455 }
 456
 457 static void edac_delete_csrow_objects(struct mem_ctl_info *mci)
 458 {
 459         int i, chan;
 460         struct csrow_info *csrow;
 461
 462         for (i = mci->nr_csrows - 1; i >= 0; i--) {
 463                 csrow = mci->csrows[i];
 464                 if (!nr_pages_per_csrow(csrow))
 465                         continue;
 466                 for (chan = csrow->nr_channels - 1; chan >= 0; chan--) {
 467                         if (!csrow->channels[chan]->dimm->nr_pages)
 468                                 continue;
 469                         edac_dbg(1, "Removing csrow %d channel %d sysfs nodes\n",
 470                                  i, chan);
 471                         device_remove_file(&csrow->dev,
 472                                                 dynamic_csrow_dimm_attr[chan]);
 473                         device_remove_file(&csrow->dev,
 474                                                 dynamic_csrow_ce_count_attr[chan]);
 475                 }
 476                 device_unregister(&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->csbased)
 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 (strict_strtoul(data, 10, &bandwidth) < 0)
 682                 return -EINVAL;
 683
 684         new_bw = mci->set_sdram_scrub_rate(mci, bandwidth);
 685         if (new_bw < 0) {
 686                 edac_printk(KERN_WARNING, EDAC_MC,
 687                             "Error setting scrub rate to: %lu\n", bandwidth);
 688                 return -EINVAL;
 689         }
 690
 691         return count;
 692 }
 693
 694 /*
 695  * ->get_sdram_scrub_rate() return value semantics same as above.
 696  */
 697 static ssize_t mci_sdram_scrub_rate_show(struct device *dev,
 698                                          struct device_attribute *mattr,
 699                                          char *data)
 700 {
 701         struct mem_ctl_info *mci = to_mci(dev);
 702         int bandwidth = 0;
 703
 704         bandwidth = mci->get_sdram_scrub_rate(mci);
 705         if (bandwidth < 0) {
 706                 edac_printk(KERN_DEBUG, EDAC_MC, "Error reading scrub rate\n");
 707                 return bandwidth;
 708         }
 709
 710         return sprintf(data, "%d\n", bandwidth);
 711 }
 712
 713 /* default attribute files for the MCI object */
 714 static ssize_t mci_ue_count_show(struct device *dev,
 715                                  struct device_attribute *mattr,
 716                                  char *data)
 717 {
 718         struct mem_ctl_info *mci = to_mci(dev);
 719
 720         return sprintf(data, "%d\n", mci->ue_mc);
 721 }
 722
 723 static ssize_t mci_ce_count_show(struct device *dev,
 724                                  struct device_attribute *mattr,
 725                                  char *data)
 726 {
 727         struct mem_ctl_info *mci = to_mci(dev);
 728
 729         return sprintf(data, "%d\n", mci->ce_mc);
 730 }
 731
 732 static ssize_t mci_ce_noinfo_show(struct device *dev,
 733                                   struct device_attribute *mattr,
 734                                   char *data)
 735 {
 736         struct mem_ctl_info *mci = to_mci(dev);
 737
 738         return sprintf(data, "%d\n", mci->ce_noinfo_count);
 739 }
 740
 741 static ssize_t mci_ue_noinfo_show(struct device *dev,
 742                                   struct device_attribute *mattr,
 743                                   char *data)
 744 {
 745         struct mem_ctl_info *mci = to_mci(dev);
 746
 747         return sprintf(data, "%d\n", mci->ue_noinfo_count);
 748 }
 749
 750 static ssize_t mci_seconds_show(struct device *dev,
 751                                 struct device_attribute *mattr,
 752                                 char *data)
 753 {
 754         struct mem_ctl_info *mci = to_mci(dev);
 755
 756         return sprintf(data, "%ld\n", (jiffies - mci->start_time) / HZ);
 757 }
 758
 759 static ssize_t mci_ctl_name_show(struct device *dev,
 760                                  struct device_attribute *mattr,
 761                                  char *data)
 762 {
 763         struct mem_ctl_info *mci = to_mci(dev);
 764
 765         return sprintf(data, "%s\n", mci->ctl_name);
 766 }
 767
 768 static ssize_t mci_size_mb_show(struct device *dev,
 769                                 struct device_attribute *mattr,
 770                                 char *data)
 771 {
 772         struct mem_ctl_info *mci = to_mci(dev);
 773         int total_pages = 0, csrow_idx, j;
 774
 775         for (csrow_idx = 0; csrow_idx < mci->nr_csrows; csrow_idx++) {
 776                 struct csrow_info *csrow = mci->csrows[csrow_idx];
 777
 778                 for (j = 0; j < csrow->nr_channels; j++) {
 779                         struct dimm_info *dimm = csrow->channels[j]->dimm;
 780
 781                         total_pages += dimm->nr_pages;
 782                 }
 783         }
 784
 785         return sprintf(data, "%u\n", PAGES_TO_MiB(total_pages));
 786 }
 787
 788 static ssize_t mci_max_location_show(struct device *dev,
 789                                      struct device_attribute *mattr,
 790                                      char *data)
 791 {
 792         struct mem_ctl_info *mci = to_mci(dev);
 793         int i;
 794         char *p = data;
 795
 796         for (i = 0; i < mci->n_layers; i++) {
 797                 p += sprintf(p, "%s %d ",
 798                              edac_layer_name[mci->layers[i].type],
 799                              mci->layers[i].size - 1);
 800         }
 801
 802         return p - data;
 803 }
 804
 805 #ifdef CONFIG_EDAC_DEBUG
 806 static ssize_t edac_fake_inject_write(struct file *file,
 807                                       const char __user *data,
 808                                       size_t count, loff_t *ppos)
 809 {
 810         struct device *dev = file->private_data;
 811         struct mem_ctl_info *mci = to_mci(dev);
 812         static enum hw_event_mc_err_type type;
 813         u16 errcount = mci->fake_inject_count;
 814
 815         if (!errcount)
 816                 errcount = 1;
 817
 818         type = mci->fake_inject_ue ? HW_EVENT_ERR_UNCORRECTED
 819                                    : HW_EVENT_ERR_CORRECTED;
 820
 821         printk(KERN_DEBUG
 822                "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",
 823                 errcount,
 824                 (type == HW_EVENT_ERR_UNCORRECTED) ? "UE" : "CE",
 825                 errcount > 1 ? "s" : "",
 826                 mci->fake_inject_layer[0],
 827                 mci->fake_inject_layer[1],
 828                 mci->fake_inject_layer[2]
 829                );
 830         edac_mc_handle_error(type, mci, errcount, 0, 0, 0,
 831                              mci->fake_inject_layer[0],
 832                              mci->fake_inject_layer[1],
 833                              mci->fake_inject_layer[2],
 834                              "FAKE ERROR", "for EDAC testing only");
 835
 836         return count;
 837 }
 838
 839 static const struct file_operations debug_fake_inject_fops = {
 840         .open = simple_open,
 841         .write = edac_fake_inject_write,
 842         .llseek = generic_file_llseek,
 843 };
 844 #endif
 845
 846 /* default Control file */
 847 DEVICE_ATTR(reset_counters, S_IWUSR, NULL, mci_reset_counters_store);
 848
 849 /* default Attribute files */
 850 DEVICE_ATTR(mc_name, S_IRUGO, mci_ctl_name_show, NULL);
 851 DEVICE_ATTR(size_mb, S_IRUGO, mci_size_mb_show, NULL);
 852 DEVICE_ATTR(seconds_since_reset, S_IRUGO, mci_seconds_show, NULL);
 853 DEVICE_ATTR(ue_noinfo_count, S_IRUGO, mci_ue_noinfo_show, NULL);
 854 DEVICE_ATTR(ce_noinfo_count, S_IRUGO, mci_ce_noinfo_show, NULL);
 855 DEVICE_ATTR(ue_count, S_IRUGO, mci_ue_count_show, NULL);
 856 DEVICE_ATTR(ce_count, S_IRUGO, mci_ce_count_show, NULL);
 857 DEVICE_ATTR(max_location, S_IRUGO, mci_max_location_show, NULL);
 858
 859 /* memory scrubber attribute file */
 860 DEVICE_ATTR(sdram_scrub_rate, 0, NULL, NULL);
 861
 862 static struct attribute *mci_attrs[] = {
 863         &dev_attr_reset_counters.attr,
 864         &dev_attr_mc_name.attr,
 865         &dev_attr_size_mb.attr,
 866         &dev_attr_seconds_since_reset.attr,
 867         &dev_attr_ue_noinfo_count.attr,
 868         &dev_attr_ce_noinfo_count.attr,
 869         &dev_attr_ue_count.attr,
 870         &dev_attr_ce_count.attr,
 871         &dev_attr_max_location.attr,
 872         NULL
 873 };
 874
 875 static struct attribute_group mci_attr_grp = {
 876         .attrs  = mci_attrs,
 877 };
 878
 879 static const struct attribute_group *mci_attr_groups[] = {
 880         &mci_attr_grp,
 881         NULL
 882 };
 883
 884 static void mci_attr_release(struct device *dev)
 885 {
 886         struct mem_ctl_info *mci = container_of(dev, struct mem_ctl_info, dev);
 887
 888         edac_dbg(1, "Releasing csrow device %s\n", dev_name(dev));
 889         kfree(mci);
 890 }
 891
 892 static struct device_type mci_attr_type = {
 893         .groups         = mci_attr_groups,
 894         .release        = mci_attr_release,
 895 };
 896
 897 #ifdef CONFIG_EDAC_DEBUG
 898 static struct dentry *edac_debugfs;
 899
 900 int __init edac_debugfs_init(void)
 901 {
 902         edac_debugfs = debugfs_create_dir("edac", NULL);
 903         if (IS_ERR(edac_debugfs)) {
 904                 edac_debugfs = NULL;
 905                 return -ENOMEM;
 906         }
 907         return 0;
 908 }
 909
 910 void __exit edac_debugfs_exit(void)
 911 {
 912         debugfs_remove(edac_debugfs);
 913 }
 914
 915 int edac_create_debug_nodes(struct mem_ctl_info *mci)
 916 {
 917         struct dentry *d, *parent;
 918         char name[80];
 919         int i;
 920
 921         if (!edac_debugfs)
 922                 return -ENODEV;
 923
 924         d = debugfs_create_dir(mci->dev.kobj.name, edac_debugfs);
 925         if (!d)
 926                 return -ENOMEM;
 927         parent = d;
 928
 929         for (i = 0; i < mci->n_layers; i++) {
 930                 sprintf(name, "fake_inject_%s",
 931                              edac_layer_name[mci->layers[i].type]);
 932                 d = debugfs_create_u8(name, S_IRUGO | S_IWUSR, parent,
 933                                       &mci->fake_inject_layer[i]);
 934                 if (!d)
 935                         goto nomem;
 936         }
 937
 938         d = debugfs_create_bool("fake_inject_ue", S_IRUGO | S_IWUSR, parent,
 939                                 &mci->fake_inject_ue);
 940         if (!d)
 941                 goto nomem;
 942
 943         d = debugfs_create_u16("fake_inject_count", S_IRUGO | S_IWUSR, parent,
 944                                 &mci->fake_inject_count);
 945         if (!d)
 946                 goto nomem;
 947
 948         d = debugfs_create_file("fake_inject", S_IWUSR, parent,
 949                                 &mci->dev,
 950                                 &debug_fake_inject_fops);
 951         if (!d)
 952                 goto nomem;
 953
 954         mci->debugfs = parent;
 955         return 0;
 956 nomem:
 957         debugfs_remove(mci->debugfs);
 958         return -ENOMEM;
 959 }
 960 #endif
 961
 962 /*
 963  * Create a new Memory Controller kobject instance,
 964  *      mc<id> under the 'mc' directory
 965  *
 966  * Return:
 967  *      0       Success
 968  *      !0      Failure
 969  */
 970 int edac_create_sysfs_mci_device(struct mem_ctl_info *mci)
 971 {
 972         int i, err;
 973
 974         /*
 975          * The memory controller needs its own bus, in order to avoid
 976          * namespace conflicts at /sys/bus/edac.
 977          */
 978         mci->bus.name = kasprintf(GFP_KERNEL, "mc%d", mci->mc_idx);
 979         if (!mci->bus.name)
 980                 return -ENOMEM;
 981         edac_dbg(0, "creating bus %s\n", mci->bus.name);
 982         err = bus_register(&mci->bus);
 983         if (err < 0)
 984                 return err;
 985
 986         /* get the /sys/devices/system/edac subsys reference */
 987         mci->dev.type = &mci_attr_type;
 988         device_initialize(&mci->dev);
 989
 990         mci->dev.parent = mci_pdev;
 991         mci->dev.bus = &mci->bus;
 992         dev_set_name(&mci->dev, "mc%d", mci->mc_idx);
 993         dev_set_drvdata(&mci->dev, mci);
 994         pm_runtime_forbid(&mci->dev);
 995
 996         edac_dbg(0, "creating device %s\n", dev_name(&mci->dev));
 997         err = device_add(&mci->dev);
 998         if (err < 0) {
 999                 edac_dbg(1, "failure: create device %s\n", dev_name(&mci->dev));
1000                 bus_unregister(&mci->bus);
1001                 kfree(mci->bus.name);
1002                 return err;
1003         }
1004
1005         if (mci->set_sdram_scrub_rate || mci->get_sdram_scrub_rate) {
1006                 if (mci->get_sdram_scrub_rate) {
1007                         dev_attr_sdram_scrub_rate.attr.mode |= S_IRUGO;
1008                         dev_attr_sdram_scrub_rate.show = &mci_sdram_scrub_rate_show;
1009                 }
1010                 if (mci->set_sdram_scrub_rate) {
1011                         dev_attr_sdram_scrub_rate.attr.mode |= S_IWUSR;
1012                         dev_attr_sdram_scrub_rate.store = &mci_sdram_scrub_rate_store;
1013                 }
1014                 err = device_create_file(&mci->dev,
1015                                          &dev_attr_sdram_scrub_rate);
1016                 if (err) {
1017                         edac_dbg(1, "failure: create sdram_scrub_rate\n");
1018                         goto fail2;
1019                 }
1020         }
1021         /*
1022          * Create the dimm/rank devices
1023          */
1024         for (i = 0; i < mci->tot_dimms; i++) {
1025                 struct dimm_info *dimm = mci->dimms[i];
1026                 /* Only expose populated DIMMs */
1027                 if (dimm->nr_pages == 0)
1028                         continue;
1029 #ifdef CONFIG_EDAC_DEBUG
1030                 edac_dbg(1, "creating dimm%d, located at ", i);
1031                 if (edac_debug_level >= 1) {
1032                         int lay;
1033                         for (lay = 0; lay < mci->n_layers; lay++)
1034                                 printk(KERN_CONT "%s %d ",
1035                                         edac_layer_name[mci->layers[lay].type],
1036                                         dimm->location[lay]);
1037                         printk(KERN_CONT "\n");
1038                 }
1039 #endif
1040                 err = edac_create_dimm_object(mci, dimm, i);
1041                 if (err) {
1042                         edac_dbg(1, "failure: create dimm %d obj\n", i);
1043                         goto fail;
1044                 }
1045         }
1046
1047 #ifdef CONFIG_EDAC_LEGACY_SYSFS
1048         err = edac_create_csrow_objects(mci);
1049         if (err < 0)
1050                 goto fail;
1051 #endif
1052
1053 #ifdef CONFIG_EDAC_DEBUG
1054         edac_create_debug_nodes(mci);
1055 #endif
1056         return 0;
1057
1058 fail:
1059         for (i--; i >= 0; i--) {
1060                 struct dimm_info *dimm = mci->dimms[i];
1061                 if (dimm->nr_pages == 0)
1062                         continue;
1063                 device_unregister(&dimm->dev);
1064         }
1065 fail2:
1066         device_unregister(&mci->dev);
1067         bus_unregister(&mci->bus);
1068         kfree(mci->bus.name);
1069         return err;
1070 }
1071
1072 /*
1073  * remove a Memory Controller instance
1074  */
1075 void edac_remove_sysfs_mci_device(struct mem_ctl_info *mci)
1076 {
1077         int i;
1078
1079         edac_dbg(0, "\n");
1080
1081 #ifdef CONFIG_EDAC_DEBUG
1082         debugfs_remove(mci->debugfs);
1083 #endif
1084 #ifdef CONFIG_EDAC_LEGACY_SYSFS
1085         edac_delete_csrow_objects(mci);
1086 #endif
1087
1088         for (i = 0; i < mci->tot_dimms; i++) {
1089                 struct dimm_info *dimm = mci->dimms[i];
1090                 if (dimm->nr_pages == 0)
1091                         continue;
1092                 edac_dbg(0, "removing device %s\n", dev_name(&dimm->dev));
1093                 device_unregister(&dimm->dev);
1094         }
1095 }
1096
1097 void edac_unregister_sysfs(struct mem_ctl_info *mci)
1098 {
1099         edac_dbg(1, "Unregistering device %s\n", dev_name(&mci->dev));
1100         device_unregister(&mci->dev);
1101         bus_unregister(&mci->bus);
1102         kfree(mci->bus.name);
1103 }
1104
1105 static void mc_attr_release(struct device *dev)
1106 {
1107         /*
1108          * There's no container structure here, as this is just the mci
1109          * parent device, used to create the /sys/devices/mc sysfs node.
1110          * So, there are no attributes on it.
1111          */
1112         edac_dbg(1, "Releasing device %s\n", dev_name(dev));
1113         kfree(dev);
1114 }
1115
1116 static struct device_type mc_attr_type = {
1117         .release        = mc_attr_release,
1118 };
1119 /*
1120  * Init/exit code for the module. Basically, creates/removes /sys/class/rc
1121  */
1122 int __init edac_mc_sysfs_init(void)
1123 {
1124         struct bus_type *edac_subsys;
1125         int err;
1126
1127         /* get the /sys/devices/system/edac subsys reference */
1128         edac_subsys = edac_get_sysfs_subsys();
1129         if (edac_subsys == NULL) {
1130                 edac_dbg(1, "no edac_subsys\n");
1131                 err = -EINVAL;
1132                 goto out;
1133         }
1134
1135         mci_pdev = kzalloc(sizeof(*mci_pdev), GFP_KERNEL);
1136         if (!mci_pdev) {
1137                 err = -ENOMEM;
1138                 goto out_put_sysfs;
1139         }
1140
1141         mci_pdev->bus = edac_subsys;
1142         mci_pdev->type = &mc_attr_type;
1143         device_initialize(mci_pdev);
1144         dev_set_name(mci_pdev, "mc");
1145
1146         err = device_add(mci_pdev);
1147         if (err < 0)
1148                 goto out_dev_free;
1149
1150         edac_dbg(0, "device %s created\n", dev_name(mci_pdev));
1151
1152         return 0;
1153
1154  out_dev_free:
1155         kfree(mci_pdev);
1156  out_put_sysfs:
1157         edac_put_sysfs_subsys();
1158  out:
1159         return err;
1160 }
1161
1162 void __exit edac_mc_sysfs_exit(void)
1163 {
1164         device_unregister(mci_pdev);
1165         edac_put_sysfs_subsys();
1166 }