drivers/edac/edac_mc_sysfs.c

   1 /*
   2  * edac_mc kernel module
   3  * (C) 2005-2007 Linux Networx (http://lnxi.com)
   4  *
   5  * This file may be distributed under the terms of the
   6  * GNU General Public License.
   7  *
   8  * Written Doug Thompson <norsk5@xmission.com> www.softwarebitmaker.com
   9  *
  10  * (c) 2012 - Mauro Carvalho Chehab <mchehab@redhat.com>
  11  *      The entire API were re-written, and ported to use struct device
  12  *
  13  */
  14
  15 #include <linux/ctype.h>
  16 #include <linux/slab.h>
  17 #include <linux/edac.h>
  18 #include <linux/bug.h>
  19 #include <linux/pm_runtime.h>
  20 #include <linux/uaccess.h>
  21
  22 #include "edac_core.h"
  23 #include "edac_module.h"
  24
  25 /* MC EDAC Controls, setable by module parameter, and sysfs */
  26 static int edac_mc_log_ue = 1;
  27 static int edac_mc_log_ce = 1;
  28 static int edac_mc_panic_on_ue;
  29 static int edac_mc_poll_msec = 1000;
  30
  31 /* Getter functions for above */
  32 int edac_mc_get_log_ue(void)
  33 {
  34         return edac_mc_log_ue;
  35 }
  36
  37 int edac_mc_get_log_ce(void)
  38 {
  39         return edac_mc_log_ce;
  40 }
  41
  42 int edac_mc_get_panic_on_ue(void)
  43 {
  44         return edac_mc_panic_on_ue;
  45 }
  46
  47 /* this is temporary */
  48 int edac_mc_get_poll_msec(void)
  49 {
  50         return edac_mc_poll_msec;
  51 }
  52
  53 static int edac_set_poll_msec(const char *val, struct kernel_param *kp)
  54 {
  55         long l;
  56         int ret;
  57
  58         if (!val)
  59                 return -EINVAL;
  60
  61         ret = strict_strtol(val, 0, &l);
  62         if (ret == -EINVAL || ((int)l != l))
  63                 return -EINVAL;
  64         *((int *)kp->arg) = l;
  65
  66         /* notify edac_mc engine to reset the poll period */
  67         edac_mc_reset_delay_period(l);
  68
  69         return 0;
  70 }
  71
  72 /* Parameter declarations for above */
  73 module_param(edac_mc_panic_on_ue, int, 0644);
  74 MODULE_PARM_DESC(edac_mc_panic_on_ue, "Panic on uncorrected error: 0=off 1=on");
  75 module_param(edac_mc_log_ue, int, 0644);
  76 MODULE_PARM_DESC(edac_mc_log_ue,
  77                  "Log uncorrectable error to console: 0=off 1=on");
  78 module_param(edac_mc_log_ce, int, 0644);
  79 MODULE_PARM_DESC(edac_mc_log_ce,
  80                  "Log correctable error to console: 0=off 1=on");
  81 module_param_call(edac_mc_poll_msec, edac_set_poll_msec, param_get_int,
  82                   &edac_mc_poll_msec, 0644);
  83 MODULE_PARM_DESC(edac_mc_poll_msec, "Polling period in milliseconds");
  84
  85 static struct device mci_pdev;
  86
  87 /*
  88  * various constants for Memory Controllers
  89  */
  90 static const char *mem_types[] = {
  91         [MEM_EMPTY] = "Empty",
  92         [MEM_RESERVED] = "Reserved",
  93         [MEM_UNKNOWN] = "Unknown",
  94         [MEM_FPM] = "FPM",
  95         [MEM_EDO] = "EDO",
  96         [MEM_BEDO] = "BEDO",
  97         [MEM_SDR] = "Unbuffered-SDR",
  98         [MEM_RDR] = "Registered-SDR",
  99         [MEM_DDR] = "Unbuffered-DDR",
 100         [MEM_RDDR] = "Registered-DDR",
 101         [MEM_RMBS] = "RMBS",
 102         [MEM_DDR2] = "Unbuffered-DDR2",
 103         [MEM_FB_DDR2] = "FullyBuffered-DDR2",
 104         [MEM_RDDR2] = "Registered-DDR2",
 105         [MEM_XDR] = "XDR",
 106         [MEM_DDR3] = "Unbuffered-DDR3",
 107         [MEM_RDDR3] = "Registered-DDR3"
 108 };
 109
 110 static const char *dev_types[] = {
 111         [DEV_UNKNOWN] = "Unknown",
 112         [DEV_X1] = "x1",
 113         [DEV_X2] = "x2",
 114         [DEV_X4] = "x4",
 115         [DEV_X8] = "x8",
 116         [DEV_X16] = "x16",
 117         [DEV_X32] = "x32",
 118         [DEV_X64] = "x64"
 119 };
 120
 121 static const char *edac_caps[] = {
 122         [EDAC_UNKNOWN] = "Unknown",
 123         [EDAC_NONE] = "None",
 124         [EDAC_RESERVED] = "Reserved",
 125         [EDAC_PARITY] = "PARITY",
 126         [EDAC_EC] = "EC",
 127         [EDAC_SECDED] = "SECDED",
 128         [EDAC_S2ECD2ED] = "S2ECD2ED",
 129         [EDAC_S4ECD4ED] = "S4ECD4ED",
 130         [EDAC_S8ECD8ED] = "S8ECD8ED",
 131         [EDAC_S16ECD16ED] = "S16ECD16ED"
 132 };
 133
 134 #ifdef CONFIG_EDAC_LEGACY_SYSFS
 135 /*
 136  * EDAC sysfs CSROW data structures and methods
 137  */
 138
 139 #define to_csrow(k) container_of(k, struct csrow_info, dev)
 140
 141 /*
 142  * We need it to avoid namespace conflicts between the legacy API
 143  * and the per-dimm/per-rank one
 144  */
 145 #define DEVICE_ATTR_LEGACY(_name, _mode, _show, _store) \
 146         struct device_attribute dev_attr_legacy_##_name = __ATTR(_name, _mode, _show, _store)
 147
 148 struct dev_ch_attribute {
 149         struct device_attribute attr;
 150         int channel;
 151 };
 152
 153 #define DEVICE_CHANNEL(_name, _mode, _show, _store, _var) \
 154         struct dev_ch_attribute dev_attr_legacy_##_name = \
 155                 { __ATTR(_name, _mode, _show, _store), (_var) }
 156
 157 #define to_channel(k) (container_of(k, struct dev_ch_attribute, attr)->channel)
 158
 159 /* Set of more default csrow<id> attribute show/store functions */
 160 static ssize_t csrow_ue_count_show(struct device *dev,
 161                                    struct device_attribute *mattr, char *data)
 162 {
 163         struct csrow_info *csrow = to_csrow(dev);
 164
 165         return sprintf(data, "%u\n", csrow->ue_count);
 166 }
 167
 168 static ssize_t csrow_ce_count_show(struct device *dev,
 169                                    struct device_attribute *mattr, char *data)
 170 {
 171         struct csrow_info *csrow = to_csrow(dev);
 172
 173         return sprintf(data, "%u\n", csrow->ce_count);
 174 }
 175
 176 static ssize_t csrow_size_show(struct device *dev,
 177                                struct device_attribute *mattr, char *data)
 178 {
 179         struct csrow_info *csrow = to_csrow(dev);
 180         int i;
 181         u32 nr_pages = 0;
 182
 183         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 *device)
 287 {
 288         debugf1("Releasing csrow device %s\n", dev_name(device));
 289 }
 290
 291 static struct device_type csrow_attr_type = {
 292         .groups         = csrow_attr_groups,
 293         .release        = csrow_attr_release,
 294 };
 295
 296 /*
 297  * possible dynamic channel DIMM Label attribute files
 298  *
 299  */
 300
 301 #define EDAC_NR_CHANNELS        6
 302
 303 DEVICE_CHANNEL(ch0_dimm_label, S_IRUGO | S_IWUSR,
 304         channel_dimm_label_show, channel_dimm_label_store, 0);
 305 DEVICE_CHANNEL(ch1_dimm_label, S_IRUGO | S_IWUSR,
 306         channel_dimm_label_show, channel_dimm_label_store, 1);
 307 DEVICE_CHANNEL(ch2_dimm_label, S_IRUGO | S_IWUSR,
 308         channel_dimm_label_show, channel_dimm_label_store, 2);
 309 DEVICE_CHANNEL(ch3_dimm_label, S_IRUGO | S_IWUSR,
 310         channel_dimm_label_show, channel_dimm_label_store, 3);
 311 DEVICE_CHANNEL(ch4_dimm_label, S_IRUGO | S_IWUSR,
 312         channel_dimm_label_show, channel_dimm_label_store, 4);
 313 DEVICE_CHANNEL(ch5_dimm_label, S_IRUGO | S_IWUSR,
 314         channel_dimm_label_show, channel_dimm_label_store, 5);
 315
 316 /* Total possible dynamic DIMM Label attribute file table */
 317 static struct device_attribute *dynamic_csrow_dimm_attr[] = {
 318         &dev_attr_legacy_ch0_dimm_label.attr,
 319         &dev_attr_legacy_ch1_dimm_label.attr,
 320         &dev_attr_legacy_ch2_dimm_label.attr,
 321         &dev_attr_legacy_ch3_dimm_label.attr,
 322         &dev_attr_legacy_ch4_dimm_label.attr,
 323         &dev_attr_legacy_ch5_dimm_label.attr
 324 };
 325
 326 /* possible dynamic channel ce_count attribute files */
 327 DEVICE_CHANNEL(ch0_ce_count, S_IRUGO | S_IWUSR,
 328                    channel_ce_count_show, NULL, 0);
 329 DEVICE_CHANNEL(ch1_ce_count, S_IRUGO | S_IWUSR,
 330                    channel_ce_count_show, NULL, 1);
 331 DEVICE_CHANNEL(ch2_ce_count, S_IRUGO | S_IWUSR,
 332                    channel_ce_count_show, NULL, 2);
 333 DEVICE_CHANNEL(ch3_ce_count, S_IRUGO | S_IWUSR,
 334                    channel_ce_count_show, NULL, 3);
 335 DEVICE_CHANNEL(ch4_ce_count, S_IRUGO | S_IWUSR,
 336                    channel_ce_count_show, NULL, 4);
 337 DEVICE_CHANNEL(ch5_ce_count, S_IRUGO | S_IWUSR,
 338                    channel_ce_count_show, NULL, 5);
 339
 340 /* Total possible dynamic ce_count attribute file table */
 341 static struct device_attribute *dynamic_csrow_ce_count_attr[] = {
 342         &dev_attr_legacy_ch0_ce_count.attr,
 343         &dev_attr_legacy_ch1_ce_count.attr,
 344         &dev_attr_legacy_ch2_ce_count.attr,
 345         &dev_attr_legacy_ch3_ce_count.attr,
 346         &dev_attr_legacy_ch4_ce_count.attr,
 347         &dev_attr_legacy_ch5_ce_count.attr
 348 };
 349
 350 /* Create a CSROW object under specifed edac_mc_device */
 351 static int edac_create_csrow_object(struct mem_ctl_info *mci,
 352                                     struct csrow_info *csrow, int index)
 353 {
 354         int err, chan;
 355
 356         if (csrow->nr_channels >= EDAC_NR_CHANNELS)
 357                 return -ENODEV;
 358
 359         csrow->dev.type = &csrow_attr_type;
 360         csrow->dev.bus = &mci->bus;
 361         device_initialize(&csrow->dev);
 362         csrow->dev.parent = &mci->dev;
 363         dev_set_name(&csrow->dev, "csrow%d", index);
 364         dev_set_drvdata(&csrow->dev, csrow);
 365
 366         debugf0("%s(): creating (virtual) csrow node %s\n", __func__,
 367                 dev_name(&csrow->dev));
 368
 369         err = device_add(&csrow->dev);
 370         if (err < 0)
 371                 return err;
 372
 373         for (chan = 0; chan < csrow->nr_channels; chan++) {
 374                 err = device_create_file(&csrow->dev,
 375                                          dynamic_csrow_dimm_attr[chan]);
 376                 if (err < 0)
 377                         goto error;
 378                 err = device_create_file(&csrow->dev,
 379                                          dynamic_csrow_ce_count_attr[chan]);
 380                 if (err < 0) {
 381                         device_remove_file(&csrow->dev,
 382                                            dynamic_csrow_dimm_attr[chan]);
 383                         goto error;
 384                 }
 385         }
 386
 387         return 0;
 388
 389 error:
 390         for (--chan; chan >= 0; chan--) {
 391                 device_remove_file(&csrow->dev,
 392                                         dynamic_csrow_dimm_attr[chan]);
 393                 device_remove_file(&csrow->dev,
 394                                            dynamic_csrow_ce_count_attr[chan]);
 395         }
 396         put_device(&csrow->dev);
 397
 398         return err;
 399 }
 400
 401 /* Create a CSROW object under specifed edac_mc_device */
 402 static int edac_create_csrow_objects(struct mem_ctl_info *mci)
 403 {
 404         int err, i, chan;
 405         struct csrow_info *csrow;
 406
 407         for (i = 0; i < mci->nr_csrows; i++) {
 408                 err = edac_create_csrow_object(mci, &mci->csrows[i], i);
 409                 if (err < 0)
 410                         goto error;
 411         }
 412         return 0;
 413
 414 error:
 415         for (--i; i >= 0; i--) {
 416                 csrow = &mci->csrows[i];
 417                 for (chan = csrow->nr_channels - 1; chan >= 0; chan--) {
 418                         device_remove_file(&csrow->dev,
 419                                                 dynamic_csrow_dimm_attr[chan]);
 420                         device_remove_file(&csrow->dev,
 421                                                 dynamic_csrow_ce_count_attr[chan]);
 422                 }
 423                 put_device(&mci->csrows[i].dev);
 424         }
 425
 426         return err;
 427 }
 428
 429 static void edac_delete_csrow_objects(struct mem_ctl_info *mci)
 430 {
 431         int i, chan;
 432         struct csrow_info *csrow;
 433
 434         for (i = mci->nr_csrows - 1; i >= 0; i--) {
 435                 csrow = &mci->csrows[i];
 436                 for (chan = csrow->nr_channels - 1; chan >= 0; chan--) {
 437                         debugf1("Removing csrow %d channel %d sysfs nodes\n",
 438                                 i, chan);
 439                         device_remove_file(&csrow->dev,
 440                                                 dynamic_csrow_dimm_attr[chan]);
 441                         device_remove_file(&csrow->dev,
 442                                                 dynamic_csrow_ce_count_attr[chan]);
 443                 }
 444                 put_device(&mci->csrows[i].dev);
 445                 device_del(&mci->csrows[i].dev);
 446         }
 447 }
 448 #endif
 449
 450 /*
 451  * Per-dimm (or per-rank) devices
 452  */
 453
 454 #define to_dimm(k) container_of(k, struct dimm_info, dev)
 455
 456 /* show/store functions for DIMM Label attributes */
 457 static ssize_t dimmdev_location_show(struct device *dev,
 458                                      struct device_attribute *mattr, char *data)
 459 {
 460         struct dimm_info *dimm = to_dimm(dev);
 461         struct mem_ctl_info *mci = dimm->mci;
 462         int i;
 463         char *p = data;
 464
 465         for (i = 0; i < mci->n_layers; i++) {
 466                 p += sprintf(p, "%s %d ",
 467                              edac_layer_name[mci->layers[i].type],
 468                              dimm->location[i]);
 469         }
 470
 471         return p - data;
 472 }
 473
 474 static ssize_t dimmdev_label_show(struct device *dev,
 475                                   struct device_attribute *mattr, char *data)
 476 {
 477         struct dimm_info *dimm = to_dimm(dev);
 478
 479         /* if field has not been initialized, there is nothing to send */
 480         if (!dimm->label[0])
 481                 return 0;
 482
 483         return snprintf(data, EDAC_MC_LABEL_LEN, "%s\n", dimm->label);
 484 }
 485
 486 static ssize_t dimmdev_label_store(struct device *dev,
 487                                    struct device_attribute *mattr,
 488                                    const char *data,
 489                                    size_t count)
 490 {
 491         struct dimm_info *dimm = to_dimm(dev);
 492
 493         ssize_t max_size = 0;
 494
 495         max_size = min((ssize_t) count, (ssize_t) EDAC_MC_LABEL_LEN - 1);
 496         strncpy(dimm->label, data, max_size);
 497         dimm->label[max_size] = '\0';
 498
 499         return max_size;
 500 }
 501
 502 static ssize_t dimmdev_size_show(struct device *dev,
 503                                  struct device_attribute *mattr, char *data)
 504 {
 505         struct dimm_info *dimm = to_dimm(dev);
 506
 507         return sprintf(data, "%u\n", PAGES_TO_MiB(dimm->nr_pages));
 508 }
 509
 510 static ssize_t dimmdev_mem_type_show(struct device *dev,
 511                                      struct device_attribute *mattr, char *data)
 512 {
 513         struct dimm_info *dimm = to_dimm(dev);
 514
 515         return sprintf(data, "%s\n", mem_types[dimm->mtype]);
 516 }
 517
 518 static ssize_t dimmdev_dev_type_show(struct device *dev,
 519                                      struct device_attribute *mattr, char *data)
 520 {
 521         struct dimm_info *dimm = to_dimm(dev);
 522
 523         return sprintf(data, "%s\n", dev_types[dimm->dtype]);
 524 }
 525
 526 static ssize_t dimmdev_edac_mode_show(struct device *dev,
 527                                       struct device_attribute *mattr,
 528                                       char *data)
 529 {
 530         struct dimm_info *dimm = to_dimm(dev);
 531
 532         return sprintf(data, "%s\n", edac_caps[dimm->edac_mode]);
 533 }
 534
 535 /* dimm/rank attribute files */
 536 static DEVICE_ATTR(dimm_label, S_IRUGO | S_IWUSR,
 537                    dimmdev_label_show, dimmdev_label_store);
 538 static DEVICE_ATTR(dimm_location, S_IRUGO, dimmdev_location_show, NULL);
 539 static DEVICE_ATTR(size, S_IRUGO, dimmdev_size_show, NULL);
 540 static DEVICE_ATTR(dimm_mem_type, S_IRUGO, dimmdev_mem_type_show, NULL);
 541 static DEVICE_ATTR(dimm_dev_type, S_IRUGO, dimmdev_dev_type_show, NULL);
 542 static DEVICE_ATTR(dimm_edac_mode, S_IRUGO, dimmdev_edac_mode_show, NULL);
 543
 544 /* attributes of the dimm<id>/rank<id> object */
 545 static struct attribute *dimm_attrs[] = {
 546         &dev_attr_dimm_label.attr,
 547         &dev_attr_dimm_location.attr,
 548         &dev_attr_size.attr,
 549         &dev_attr_dimm_mem_type.attr,
 550         &dev_attr_dimm_dev_type.attr,
 551         &dev_attr_dimm_edac_mode.attr,
 552         NULL,
 553 };
 554
 555 static struct attribute_group dimm_attr_grp = {
 556         .attrs  = dimm_attrs,
 557 };
 558
 559 static const struct attribute_group *dimm_attr_groups[] = {
 560         &dimm_attr_grp,
 561         NULL
 562 };
 563
 564 static void dimm_attr_release(struct device *device)
 565 {
 566         debugf1("Releasing dimm device %s\n", dev_name(device));
 567 }
 568
 569 static struct device_type dimm_attr_type = {
 570         .groups         = dimm_attr_groups,
 571         .release        = dimm_attr_release,
 572 };
 573
 574 /* Create a DIMM object under specifed memory controller device */
 575 static int edac_create_dimm_object(struct mem_ctl_info *mci,
 576                                    struct dimm_info *dimm,
 577                                    int index)
 578 {
 579         int err;
 580         dimm->mci = mci;
 581
 582         dimm->dev.type = &dimm_attr_type;
 583         dimm->dev.bus = &mci->bus;
 584         device_initialize(&dimm->dev);
 585
 586         dimm->dev.parent = &mci->dev;
 587         if (mci->mem_is_per_rank)
 588                 dev_set_name(&dimm->dev, "rank%d", index);
 589         else
 590                 dev_set_name(&dimm->dev, "dimm%d", index);
 591         dev_set_drvdata(&dimm->dev, dimm);
 592         pm_runtime_forbid(&mci->dev);
 593
 594         err =  device_add(&dimm->dev);
 595
 596         debugf0("%s(): creating rank/dimm device %s\n", __func__,
 597                 dev_name(&dimm->dev));
 598
 599         return err;
 600 }
 601
 602 /*
 603  * Memory controller device
 604  */
 605
 606 #define to_mci(k) container_of(k, struct mem_ctl_info, dev)
 607
 608 static ssize_t mci_reset_counters_store(struct device *dev,
 609                                         struct device_attribute *mattr,
 610                                         const char *data, size_t count)
 611 {
 612         struct mem_ctl_info *mci = to_mci(dev);
 613         int cnt, row, chan, i;
 614         mci->ue_mc = 0;
 615         mci->ce_mc = 0;
 616         mci->ue_noinfo_count = 0;
 617         mci->ce_noinfo_count = 0;
 618
 619         for (row = 0; row < mci->nr_csrows; row++) {
 620                 struct csrow_info *ri = &mci->csrows[row];
 621
 622                 ri->ue_count = 0;
 623                 ri->ce_count = 0;
 624
 625                 for (chan = 0; chan < ri->nr_channels; chan++)
 626                         ri->channels[chan].ce_count = 0;
 627         }
 628
 629         cnt = 1;
 630         for (i = 0; i < mci->n_layers; i++) {
 631                 cnt *= mci->layers[i].size;
 632                 memset(mci->ce_per_layer[i], 0, cnt * sizeof(u32));
 633                 memset(mci->ue_per_layer[i], 0, cnt * sizeof(u32));
 634         }
 635
 636         mci->start_time = jiffies;
 637         return count;
 638 }
 639
 640 /* Memory scrubbing interface:
 641  *
 642  * A MC driver can limit the scrubbing bandwidth based on the CPU type.
 643  * Therefore, ->set_sdram_scrub_rate should be made to return the actual
 644  * bandwidth that is accepted or 0 when scrubbing is to be disabled.
 645  *
 646  * Negative value still means that an error has occurred while setting
 647  * the scrub rate.
 648  */
 649 static ssize_t mci_sdram_scrub_rate_store(struct device *dev,
 650                                           struct device_attribute *mattr,
 651                                           const char *data, size_t count)
 652 {
 653         struct mem_ctl_info *mci = to_mci(dev);
 654         unsigned long bandwidth = 0;
 655         int new_bw = 0;
 656
 657         if (!mci->set_sdram_scrub_rate)
 658                 return -ENODEV;
 659
 660         if (strict_strtoul(data, 10, &bandwidth) < 0)
 661                 return -EINVAL;
 662
 663         new_bw = mci->set_sdram_scrub_rate(mci, bandwidth);
 664         if (new_bw < 0) {
 665                 edac_printk(KERN_WARNING, EDAC_MC,
 666                             "Error setting scrub rate to: %lu\n", bandwidth);
 667                 return -EINVAL;
 668         }
 669
 670         return count;
 671 }
 672
 673 /*
 674  * ->get_sdram_scrub_rate() return value semantics same as above.
 675  */
 676 static ssize_t mci_sdram_scrub_rate_show(struct device *dev,
 677                                          struct device_attribute *mattr,
 678                                          char *data)
 679 {
 680         struct mem_ctl_info *mci = to_mci(dev);
 681         int bandwidth = 0;
 682
 683         if (!mci->get_sdram_scrub_rate)
 684                 return -ENODEV;
 685
 686         bandwidth = mci->get_sdram_scrub_rate(mci);
 687         if (bandwidth < 0) {
 688                 edac_printk(KERN_DEBUG, EDAC_MC, "Error reading scrub rate\n");
 689                 return bandwidth;
 690         }
 691
 692         return sprintf(data, "%d\n", bandwidth);
 693 }
 694
 695 /* default attribute files for the MCI object */
 696 static ssize_t mci_ue_count_show(struct device *dev,
 697                                  struct device_attribute *mattr,
 698                                  char *data)
 699 {
 700         struct mem_ctl_info *mci = to_mci(dev);
 701
 702         return sprintf(data, "%d\n", mci->ue_mc);
 703 }
 704
 705 static ssize_t mci_ce_count_show(struct device *dev,
 706                                  struct device_attribute *mattr,
 707                                  char *data)
 708 {
 709         struct mem_ctl_info *mci = to_mci(dev);
 710
 711         return sprintf(data, "%d\n", mci->ce_mc);
 712 }
 713
 714 static ssize_t mci_ce_noinfo_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->ce_noinfo_count);
 721 }
 722
 723 static ssize_t mci_ue_noinfo_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->ue_noinfo_count);
 730 }
 731
 732 static ssize_t mci_seconds_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, "%ld\n", (jiffies - mci->start_time) / HZ);
 739 }
 740
 741 static ssize_t mci_ctl_name_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, "%s\n", mci->ctl_name);
 748 }
 749
 750 static ssize_t mci_size_mb_show(struct device *dev,
 751                                 struct device_attribute *mattr,
 752                                 char *data)
 753 {
 754         struct mem_ctl_info *mci = to_mci(dev);
 755         int total_pages = 0, csrow_idx, j;
 756
 757         for (csrow_idx = 0; csrow_idx < mci->nr_csrows; csrow_idx++) {
 758                 struct csrow_info *csrow = &mci->csrows[csrow_idx];
 759
 760                 for (j = 0; j < csrow->nr_channels; j++) {
 761                         struct dimm_info *dimm = csrow->channels[j].dimm;
 762
 763                         total_pages += dimm->nr_pages;
 764                 }
 765         }
 766
 767         return sprintf(data, "%u\n", PAGES_TO_MiB(total_pages));
 768 }
 769
 770 static ssize_t mci_max_location_show(struct device *dev,
 771                                      struct device_attribute *mattr,
 772                                      char *data)
 773 {
 774         struct mem_ctl_info *mci = to_mci(dev);
 775         int i;
 776         char *p = data;
 777
 778         for (i = 0; i < mci->n_layers; i++) {
 779                 p += sprintf(p, "%s %d ",
 780                              edac_layer_name[mci->layers[i].type],
 781                              mci->layers[i].size - 1);
 782         }
 783
 784         return p - data;
 785 }
 786
 787 #ifdef CONFIG_EDAC_DEBUG
 788 static ssize_t edac_fake_inject_write(struct file *file,
 789                                       const char __user *data,
 790                                       size_t count, loff_t *ppos)
 791 {
 792         struct device *dev = file->private_data;
 793         struct mem_ctl_info *mci = to_mci(dev);
 794         static enum hw_event_mc_err_type type;
 795
 796         type = mci->fake_inject_ue ? HW_EVENT_ERR_UNCORRECTED
 797                                    : HW_EVENT_ERR_CORRECTED;
 798
 799         printk(KERN_DEBUG
 800                "Generating a %s fake error to %d.%d.%d to test core handling. NOTE: this won't test the driver-specific decoding logic.\n",
 801                 (type == HW_EVENT_ERR_UNCORRECTED) ? "UE" : "CE",
 802                 mci->fake_inject_layer[0],
 803                 mci->fake_inject_layer[1],
 804                 mci->fake_inject_layer[2]
 805                );
 806         edac_mc_handle_error(type, mci, 0, 0, 0,
 807                              mci->fake_inject_layer[0],
 808                              mci->fake_inject_layer[1],
 809                              mci->fake_inject_layer[2],
 810                              "FAKE ERROR", "for EDAC testing only", NULL);
 811
 812         return count;
 813 }
 814
 815 static int debugfs_open(struct inode *inode, struct file *file)
 816 {
 817         file->private_data = inode->i_private;
 818         return 0;
 819 }
 820
 821 static const struct file_operations debug_fake_inject_fops = {
 822         .open = debugfs_open,
 823         .write = edac_fake_inject_write,
 824         .llseek = generic_file_llseek,
 825 };
 826 #endif
 827
 828 /* default Control file */
 829 DEVICE_ATTR(reset_counters, S_IWUSR, NULL, mci_reset_counters_store);
 830
 831 /* default Attribute files */
 832 DEVICE_ATTR(mc_name, S_IRUGO, mci_ctl_name_show, NULL);
 833 DEVICE_ATTR(size_mb, S_IRUGO, mci_size_mb_show, NULL);
 834 DEVICE_ATTR(seconds_since_reset, S_IRUGO, mci_seconds_show, NULL);
 835 DEVICE_ATTR(ue_noinfo_count, S_IRUGO, mci_ue_noinfo_show, NULL);
 836 DEVICE_ATTR(ce_noinfo_count, S_IRUGO, mci_ce_noinfo_show, NULL);
 837 DEVICE_ATTR(ue_count, S_IRUGO, mci_ue_count_show, NULL);
 838 DEVICE_ATTR(ce_count, S_IRUGO, mci_ce_count_show, NULL);
 839 DEVICE_ATTR(max_location, S_IRUGO, mci_max_location_show, NULL);
 840
 841 /* memory scrubber attribute file */
 842 DEVICE_ATTR(sdram_scrub_rate, S_IRUGO | S_IWUSR, mci_sdram_scrub_rate_show,
 843         mci_sdram_scrub_rate_store);
 844
 845 static struct attribute *mci_attrs[] = {
 846         &dev_attr_reset_counters.attr,
 847         &dev_attr_mc_name.attr,
 848         &dev_attr_size_mb.attr,
 849         &dev_attr_seconds_since_reset.attr,
 850         &dev_attr_ue_noinfo_count.attr,
 851         &dev_attr_ce_noinfo_count.attr,
 852         &dev_attr_ue_count.attr,
 853         &dev_attr_ce_count.attr,
 854         &dev_attr_sdram_scrub_rate.attr,
 855         &dev_attr_max_location.attr,
 856         NULL
 857 };
 858
 859 static struct attribute_group mci_attr_grp = {
 860         .attrs  = mci_attrs,
 861 };
 862
 863 static const struct attribute_group *mci_attr_groups[] = {
 864         &mci_attr_grp,
 865         NULL
 866 };
 867
 868 static void mci_attr_release(struct device *device)
 869 {
 870         debugf1("Releasing mci device %s\n", dev_name(device));
 871 }
 872
 873 static struct device_type mci_attr_type = {
 874         .groups         = mci_attr_groups,
 875         .release        = mci_attr_release,
 876 };
 877
 878 #ifdef CONFIG_EDAC_DEBUG
 879 int edac_create_debug_nodes(struct mem_ctl_info *mci)
 880 {
 881         struct dentry *d, *parent;
 882         char name[80];
 883         int i;
 884
 885         d = debugfs_create_dir(mci->dev.kobj.name, mci->debugfs);
 886         if (!d)
 887                 return -ENOMEM;
 888         parent = d;
 889
 890         for (i = 0; i < mci->n_layers; i++) {
 891                 sprintf(name, "fake_inject_%s",
 892                              edac_layer_name[mci->layers[i].type]);
 893                 d = debugfs_create_u8(name, S_IRUGO | S_IWUSR, parent,
 894                                       &mci->fake_inject_layer[i]);
 895                 if (!d)
 896                         goto nomem;
 897         }
 898
 899         d = debugfs_create_bool("fake_inject_ue", S_IRUGO | S_IWUSR, parent,
 900                                 &mci->fake_inject_ue);
 901         if (!d)
 902                 goto nomem;
 903
 904         d = debugfs_create_file("fake_inject", S_IWUSR, parent,
 905                                 &mci->dev,
 906                                 &debug_fake_inject_fops);
 907         if (!d)
 908                 goto nomem;
 909
 910         return 0;
 911 nomem:
 912         debugfs_remove(mci->debugfs);
 913         return -ENOMEM;
 914 }
 915 #endif
 916
 917 /*
 918  * Create a new Memory Controller kobject instance,
 919  *      mc<id> under the 'mc' directory
 920  *
 921  * Return:
 922  *      0       Success
 923  *      !0      Failure
 924  */
 925 int edac_create_sysfs_mci_device(struct mem_ctl_info *mci)
 926 {
 927         int i, err;
 928
 929         debugf0("%s() idx=%d\n", __func__, mci->mc_idx);
 930
 931         /* get the /sys/devices/system/edac subsys reference */
 932
 933         mci->dev.type = &mci_attr_type;
 934         device_initialize(&mci->dev);
 935
 936         mci->dev.parent = &mci_pdev;
 937         mci->dev.bus = &mci->bus;
 938         dev_set_name(&mci->dev, "mc%d", mci->mc_idx);
 939         dev_set_drvdata(&mci->dev, mci);
 940         pm_runtime_forbid(&mci->dev);
 941
 942         /*
 943          * The memory controller needs its own bus, in order to avoid
 944          * namespace conflicts at /sys/bus/edac.
 945          */
 946         debugf0("creating bus %s\n",mci->bus.name);
 947         mci->bus.name = kstrdup(dev_name(&mci->dev), GFP_KERNEL);
 948         err = bus_register(&mci->bus);
 949         if (err < 0)
 950                 return err;
 951
 952         debugf0("%s(): creating device %s\n", __func__,
 953                 dev_name(&mci->dev));
 954         err = device_add(&mci->dev);
 955         if (err < 0) {
 956                 bus_unregister(&mci->bus);
 957                 kfree(mci->bus.name);
 958                 return err;
 959         }
 960
 961         /*
 962          * Create the dimm/rank devices
 963          */
 964         for (i = 0; i < mci->tot_dimms; i++) {
 965                 struct dimm_info *dimm = &mci->dimms[i];
 966                 /* Only expose populated DIMMs */
 967                 if (dimm->nr_pages == 0)
 968                         continue;
 969 #ifdef CONFIG_EDAC_DEBUG
 970                 debugf1("%s creating dimm%d, located at ",
 971                         __func__, i);
 972                 if (edac_debug_level >= 1) {
 973                         int lay;
 974                         for (lay = 0; lay < mci->n_layers; lay++)
 975                                 printk(KERN_CONT "%s %d ",
 976                                         edac_layer_name[mci->layers[lay].type],
 977                                         dimm->location[lay]);
 978                         printk(KERN_CONT "\n");
 979                 }
 980 #endif
 981                 err = edac_create_dimm_object(mci, dimm, i);
 982                 if (err) {
 983                         debugf1("%s() failure: create dimm %d obj\n",
 984                                 __func__, i);
 985                         goto fail;
 986                 }
 987         }
 988
 989 #ifdef CONFIG_EDAC_LEGACY_SYSFS
 990         err = edac_create_csrow_objects(mci);
 991         if (err < 0)
 992                 goto fail;
 993 #endif
 994
 995 #ifdef CONFIG_EDAC_DEBUG
 996         edac_create_debug_nodes(mci);
 997 #endif
 998         return 0;
 999
1000 fail:
1001         for (i--; i >= 0; i--) {
1002                 struct dimm_info *dimm = &mci->dimms[i];
1003                 if (dimm->nr_pages == 0)
1004                         continue;
1005                 put_device(&dimm->dev);
1006                 device_del(&dimm->dev);
1007         }
1008         put_device(&mci->dev);
1009         device_del(&mci->dev);
1010         bus_unregister(&mci->bus);
1011         kfree(mci->bus.name);
1012         return err;
1013 }
1014
1015 /*
1016  * remove a Memory Controller instance
1017  */
1018 void edac_remove_sysfs_mci_device(struct mem_ctl_info *mci)
1019 {
1020         int i;
1021
1022         debugf0("%s()\n", __func__);
1023
1024 #ifdef CONFIG_EDAC_DEBUG
1025         debugfs_remove(mci->debugfs);
1026 #endif
1027 #ifdef CONFIG_EDAC_LEGACY_SYSFS
1028         edac_delete_csrow_objects(mci);
1029 #endif
1030
1031         for (i = 0; i < mci->tot_dimms; i++) {
1032                 struct dimm_info *dimm = &mci->dimms[i];
1033                 if (dimm->nr_pages == 0)
1034                         continue;
1035                 debugf0("%s(): removing device %s\n", __func__,
1036                         dev_name(&dimm->dev));
1037                 put_device(&dimm->dev);
1038                 device_del(&dimm->dev);
1039         }
1040 }
1041
1042 void edac_unregister_sysfs(struct mem_ctl_info *mci)
1043 {
1044         debugf1("Unregistering device %s\n", dev_name(&mci->dev));
1045         put_device(&mci->dev);
1046         device_del(&mci->dev);
1047         bus_unregister(&mci->bus);
1048         kfree(mci->bus.name);
1049 }
1050
1051 static void mc_attr_release(struct device *device)
1052 {
1053         debugf1("Releasing device %s\n", dev_name(device));
1054 }
1055
1056 static struct device_type mc_attr_type = {
1057         .release        = mc_attr_release,
1058 };
1059 /*
1060  * Init/exit code for the module. Basically, creates/removes /sys/class/rc
1061  */
1062 int __init edac_mc_sysfs_init(void)
1063 {
1064         struct bus_type *edac_subsys;
1065         int err;
1066
1067         /* get the /sys/devices/system/edac subsys reference */
1068         edac_subsys = edac_get_sysfs_subsys();
1069         if (edac_subsys == NULL) {
1070                 debugf1("%s() no edac_subsys\n", __func__);
1071                 return -EINVAL;
1072         }
1073
1074         mci_pdev.bus = edac_subsys;
1075         mci_pdev.type = &mc_attr_type;
1076         device_initialize(&mci_pdev);
1077         dev_set_name(&mci_pdev, "mc");
1078
1079         err = device_add(&mci_pdev);
1080         if (err < 0)
1081                 return err;
1082
1083         return 0;
1084 }
1085
1086 void __exit edac_mc_sysfs_exit(void)
1087 {
1088         put_device(&mci_pdev);
1089         device_del(&mci_pdev);
1090         edac_put_sysfs_subsys();
1091 }