Pileus Git - ~andy/linux/blob - 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 *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                         goto error;
 431         }
 432         return 0;
 433
 434 error:
 435         for (--i; i >= 0; i--) {
 436                 csrow = mci->csrows[i];
 437                 if (!nr_pages_per_csrow(csrow))
 438                         continue;
 439                 for (chan = csrow->nr_channels - 1; chan >= 0; chan--) {
 440                         if (!csrow->channels[chan]->dimm->nr_pages)
 441                                 continue;
 442                         device_remove_file(&csrow->dev,
 443                                                 dynamic_csrow_dimm_attr[chan]);
 444                         device_remove_file(&csrow->dev,
 445                                                 dynamic_csrow_ce_count_attr[chan]);
 446                 }
 447                 put_device(&mci->csrows[i]->dev);
 448         }
 449
 450         return err;
 451 }
 452
 453 static void edac_delete_csrow_objects(struct mem_ctl_info *mci)
 454 {
 455         int i, chan;
 456         struct csrow_info *csrow;
 457
 458         for (i = mci->nr_csrows - 1; i >= 0; i--) {
 459                 csrow = mci->csrows[i];
 460                 if (!nr_pages_per_csrow(csrow))
 461                         continue;
 462                 for (chan = csrow->nr_channels - 1; chan >= 0; chan--) {
 463                         if (!csrow->channels[chan]->dimm->nr_pages)
 464                                 continue;
 465                         edac_dbg(1, "Removing csrow %d channel %d sysfs nodes\n",
 466                                  i, chan);
 467                         device_remove_file(&csrow->dev,
 468                                                 dynamic_csrow_dimm_attr[chan]);
 469                         device_remove_file(&csrow->dev,
 470                                                 dynamic_csrow_ce_count_attr[chan]);
 471                 }
 472                 put_device(&mci->csrows[i]->dev);
 473                 device_del(&mci->csrows[i]->dev);
 474         }
 475 }
 476 #endif
 477
 478 /*
 479  * Per-dimm (or per-rank) devices
 480  */
 481
 482 #define to_dimm(k) container_of(k, struct dimm_info, dev)
 483
 484 /* show/store functions for DIMM Label attributes */
 485 static ssize_t dimmdev_location_show(struct device *dev,
 486                                      struct device_attribute *mattr, char *data)
 487 {
 488         struct dimm_info *dimm = to_dimm(dev);
 489
 490         return edac_dimm_info_location(dimm, data, PAGE_SIZE);
 491 }
 492
 493 static ssize_t dimmdev_label_show(struct device *dev,
 494                                   struct device_attribute *mattr, char *data)
 495 {
 496         struct dimm_info *dimm = to_dimm(dev);
 497
 498         /* if field has not been initialized, there is nothing to send */
 499         if (!dimm->label[0])
 500                 return 0;
 501
 502         return snprintf(data, EDAC_MC_LABEL_LEN, "%s\n", dimm->label);
 503 }
 504
 505 static ssize_t dimmdev_label_store(struct device *dev,
 506                                    struct device_attribute *mattr,
 507                                    const char *data,
 508                                    size_t count)
 509 {
 510         struct dimm_info *dimm = to_dimm(dev);
 511
 512         ssize_t max_size = 0;
 513
 514         max_size = min((ssize_t) count, (ssize_t) EDAC_MC_LABEL_LEN - 1);
 515         strncpy(dimm->label, data, max_size);
 516         dimm->label[max_size] = '\0';
 517
 518         return max_size;
 519 }
 520
 521 static ssize_t dimmdev_size_show(struct device *dev,
 522                                  struct device_attribute *mattr, char *data)
 523 {
 524         struct dimm_info *dimm = to_dimm(dev);
 525
 526         return sprintf(data, "%u\n", PAGES_TO_MiB(dimm->nr_pages));
 527 }
 528
 529 static ssize_t dimmdev_mem_type_show(struct device *dev,
 530                                      struct device_attribute *mattr, char *data)
 531 {
 532         struct dimm_info *dimm = to_dimm(dev);
 533
 534         return sprintf(data, "%s\n", mem_types[dimm->mtype]);
 535 }
 536
 537 static ssize_t dimmdev_dev_type_show(struct device *dev,
 538                                      struct device_attribute *mattr, char *data)
 539 {
 540         struct dimm_info *dimm = to_dimm(dev);
 541
 542         return sprintf(data, "%s\n", dev_types[dimm->dtype]);
 543 }
 544
 545 static ssize_t dimmdev_edac_mode_show(struct device *dev,
 546                                       struct device_attribute *mattr,
 547                                       char *data)
 548 {
 549         struct dimm_info *dimm = to_dimm(dev);
 550
 551         return sprintf(data, "%s\n", edac_caps[dimm->edac_mode]);
 552 }
 553
 554 /* dimm/rank attribute files */
 555 static DEVICE_ATTR(dimm_label, S_IRUGO | S_IWUSR,
 556                    dimmdev_label_show, dimmdev_label_store);
 557 static DEVICE_ATTR(dimm_location, S_IRUGO, dimmdev_location_show, NULL);
 558 static DEVICE_ATTR(size, S_IRUGO, dimmdev_size_show, NULL);
 559 static DEVICE_ATTR(dimm_mem_type, S_IRUGO, dimmdev_mem_type_show, NULL);
 560 static DEVICE_ATTR(dimm_dev_type, S_IRUGO, dimmdev_dev_type_show, NULL);
 561 static DEVICE_ATTR(dimm_edac_mode, S_IRUGO, dimmdev_edac_mode_show, NULL);
 562
 563 /* attributes of the dimm<id>/rank<id> object */
 564 static struct attribute *dimm_attrs[] = {
 565         &dev_attr_dimm_label.attr,
 566         &dev_attr_dimm_location.attr,
 567         &dev_attr_size.attr,
 568         &dev_attr_dimm_mem_type.attr,
 569         &dev_attr_dimm_dev_type.attr,
 570         &dev_attr_dimm_edac_mode.attr,
 571         NULL,
 572 };
 573
 574 static struct attribute_group dimm_attr_grp = {
 575         .attrs  = dimm_attrs,
 576 };
 577
 578 static const struct attribute_group *dimm_attr_groups[] = {
 579         &dimm_attr_grp,
 580         NULL
 581 };
 582
 583 static void dimm_attr_release(struct device *dev)
 584 {
 585         struct dimm_info *dimm = container_of(dev, struct dimm_info, dev);
 586
 587         edac_dbg(1, "Releasing dimm device %s\n", dev_name(dev));
 588         kfree(dimm);
 589 }
 590
 591 static struct device_type dimm_attr_type = {
 592         .groups         = dimm_attr_groups,
 593         .release        = dimm_attr_release,
 594 };
 595
 596 /* Create a DIMM object under specifed memory controller device */
 597 static int edac_create_dimm_object(struct mem_ctl_info *mci,
 598                                    struct dimm_info *dimm,
 599                                    int index)
 600 {
 601         int err;
 602         dimm->mci = mci;
 603
 604         dimm->dev.type = &dimm_attr_type;
 605         dimm->dev.bus = &mci->bus;
 606         device_initialize(&dimm->dev);
 607
 608         dimm->dev.parent = &mci->dev;
 609         if (mci->mem_is_per_rank)
 610                 dev_set_name(&dimm->dev, "rank%d", index);
 611         else
 612                 dev_set_name(&dimm->dev, "dimm%d", index);
 613         dev_set_drvdata(&dimm->dev, dimm);
 614         pm_runtime_forbid(&mci->dev);
 615
 616         err =  device_add(&dimm->dev);
 617
 618         edac_dbg(0, "creating rank/dimm device %s\n", dev_name(&dimm->dev));
 619
 620         return err;
 621 }
 622
 623 /*
 624  * Memory controller device
 625  */
 626
 627 #define to_mci(k) container_of(k, struct mem_ctl_info, dev)
 628
 629 static ssize_t mci_reset_counters_store(struct device *dev,
 630                                         struct device_attribute *mattr,
 631                                         const char *data, size_t count)
 632 {
 633         struct mem_ctl_info *mci = to_mci(dev);
 634         int cnt, row, chan, i;
 635         mci->ue_mc = 0;
 636         mci->ce_mc = 0;
 637         mci->ue_noinfo_count = 0;
 638         mci->ce_noinfo_count = 0;
 639
 640         for (row = 0; row < mci->nr_csrows; row++) {
 641                 struct csrow_info *ri = mci->csrows[row];
 642
 643                 ri->ue_count = 0;
 644                 ri->ce_count = 0;
 645
 646                 for (chan = 0; chan < ri->nr_channels; chan++)
 647                         ri->channels[chan]->ce_count = 0;
 648         }
 649
 650         cnt = 1;
 651         for (i = 0; i < mci->n_layers; i++) {
 652                 cnt *= mci->layers[i].size;
 653                 memset(mci->ce_per_layer[i], 0, cnt * sizeof(u32));
 654                 memset(mci->ue_per_layer[i], 0, cnt * sizeof(u32));
 655         }
 656
 657         mci->start_time = jiffies;
 658         return count;
 659 }
 660
 661 /* Memory scrubbing interface:
 662  *
 663  * A MC driver can limit the scrubbing bandwidth based on the CPU type.
 664  * Therefore, ->set_sdram_scrub_rate should be made to return the actual
 665  * bandwidth that is accepted or 0 when scrubbing is to be disabled.
 666  *
 667  * Negative value still means that an error has occurred while setting
 668  * the scrub rate.
 669  */
 670 static ssize_t mci_sdram_scrub_rate_store(struct device *dev,
 671                                           struct device_attribute *mattr,
 672                                           const char *data, size_t count)
 673 {
 674         struct mem_ctl_info *mci = to_mci(dev);
 675         unsigned long bandwidth = 0;
 676         int new_bw = 0;
 677
 678         if (!mci->set_sdram_scrub_rate)
 679                 return -ENODEV;
 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         if (!mci->get_sdram_scrub_rate)
 705                 return -ENODEV;
 706
 707         bandwidth = mci->get_sdram_scrub_rate(mci);
 708         if (bandwidth < 0) {
 709                 edac_printk(KERN_DEBUG, EDAC_MC, "Error reading scrub rate\n");
 710                 return bandwidth;
 711         }
 712
 713         return sprintf(data, "%d\n", bandwidth);
 714 }
 715
 716 /* default attribute files for the MCI object */
 717 static ssize_t mci_ue_count_show(struct device *dev,
 718                                  struct device_attribute *mattr,
 719                                  char *data)
 720 {
 721         struct mem_ctl_info *mci = to_mci(dev);
 722
 723         return sprintf(data, "%d\n", mci->ue_mc);
 724 }
 725
 726 static ssize_t mci_ce_count_show(struct device *dev,
 727                                  struct device_attribute *mattr,
 728                                  char *data)
 729 {
 730         struct mem_ctl_info *mci = to_mci(dev);
 731
 732         return sprintf(data, "%d\n", mci->ce_mc);
 733 }
 734
 735 static ssize_t mci_ce_noinfo_show(struct device *dev,
 736                                   struct device_attribute *mattr,
 737                                   char *data)
 738 {
 739         struct mem_ctl_info *mci = to_mci(dev);
 740
 741         return sprintf(data, "%d\n", mci->ce_noinfo_count);
 742 }
 743
 744 static ssize_t mci_ue_noinfo_show(struct device *dev,
 745                                   struct device_attribute *mattr,
 746                                   char *data)
 747 {
 748         struct mem_ctl_info *mci = to_mci(dev);
 749
 750         return sprintf(data, "%d\n", mci->ue_noinfo_count);
 751 }
 752
 753 static ssize_t mci_seconds_show(struct device *dev,
 754                                 struct device_attribute *mattr,
 755                                 char *data)
 756 {
 757         struct mem_ctl_info *mci = to_mci(dev);
 758
 759         return sprintf(data, "%ld\n", (jiffies - mci->start_time) / HZ);
 760 }
 761
 762 static ssize_t mci_ctl_name_show(struct device *dev,
 763                                  struct device_attribute *mattr,
 764                                  char *data)
 765 {
 766         struct mem_ctl_info *mci = to_mci(dev);
 767
 768         return sprintf(data, "%s\n", mci->ctl_name);
 769 }
 770
 771 static ssize_t mci_size_mb_show(struct device *dev,
 772                                 struct device_attribute *mattr,
 773                                 char *data)
 774 {
 775         struct mem_ctl_info *mci = to_mci(dev);
 776         int total_pages = 0, csrow_idx, j;
 777
 778         for (csrow_idx = 0; csrow_idx < mci->nr_csrows; csrow_idx++) {
 779                 struct csrow_info *csrow = mci->csrows[csrow_idx];
 780
 781                 for (j = 0; j < csrow->nr_channels; j++) {
 782                         struct dimm_info *dimm = csrow->channels[j]->dimm;
 783
 784                         total_pages += dimm->nr_pages;
 785                 }
 786         }
 787
 788         return sprintf(data, "%u\n", PAGES_TO_MiB(total_pages));
 789 }
 790
 791 static ssize_t mci_max_location_show(struct device *dev,
 792                                      struct device_attribute *mattr,
 793                                      char *data)
 794 {
 795         struct mem_ctl_info *mci = to_mci(dev);
 796         int i;
 797         char *p = data;
 798
 799         for (i = 0; i < mci->n_layers; i++) {
 800                 p += sprintf(p, "%s %d ",
 801                              edac_layer_name[mci->layers[i].type],
 802                              mci->layers[i].size - 1);
 803         }
 804
 805         return p - data;
 806 }
 807
 808 #ifdef CONFIG_EDAC_DEBUG
 809 static ssize_t edac_fake_inject_write(struct file *file,
 810                                       const char __user *data,
 811                                       size_t count, loff_t *ppos)
 812 {
 813         struct device *dev = file->private_data;
 814         struct mem_ctl_info *mci = to_mci(dev);
 815         static enum hw_event_mc_err_type type;
 816         u16 errcount = mci->fake_inject_count;
 817
 818         if (!errcount)
 819                 errcount = 1;
 820
 821         type = mci->fake_inject_ue ? HW_EVENT_ERR_UNCORRECTED
 822                                    : HW_EVENT_ERR_CORRECTED;
 823
 824         printk(KERN_DEBUG
 825                "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",
 826                 errcount,
 827                 (type == HW_EVENT_ERR_UNCORRECTED) ? "UE" : "CE",
 828                 errcount > 1 ? "s" : "",
 829                 mci->fake_inject_layer[0],
 830                 mci->fake_inject_layer[1],
 831                 mci->fake_inject_layer[2]
 832                );
 833         edac_mc_handle_error(type, mci, errcount, 0, 0, 0,
 834                              mci->fake_inject_layer[0],
 835                              mci->fake_inject_layer[1],
 836                              mci->fake_inject_layer[2],
 837                              "FAKE ERROR", "for EDAC testing only");
 838
 839         return count;
 840 }
 841
 842 static int debugfs_open(struct inode *inode, struct file *file)
 843 {
 844         file->private_data = inode->i_private;
 845         return 0;
 846 }
 847
 848 static const struct file_operations debug_fake_inject_fops = {
 849         .open = debugfs_open,
 850         .write = edac_fake_inject_write,
 851         .llseek = generic_file_llseek,
 852 };
 853 #endif
 854
 855 /* default Control file */
 856 DEVICE_ATTR(reset_counters, S_IWUSR, NULL, mci_reset_counters_store);
 857
 858 /* default Attribute files */
 859 DEVICE_ATTR(mc_name, S_IRUGO, mci_ctl_name_show, NULL);
 860 DEVICE_ATTR(size_mb, S_IRUGO, mci_size_mb_show, NULL);
 861 DEVICE_ATTR(seconds_since_reset, S_IRUGO, mci_seconds_show, NULL);
 862 DEVICE_ATTR(ue_noinfo_count, S_IRUGO, mci_ue_noinfo_show, NULL);
 863 DEVICE_ATTR(ce_noinfo_count, S_IRUGO, mci_ce_noinfo_show, NULL);
 864 DEVICE_ATTR(ue_count, S_IRUGO, mci_ue_count_show, NULL);
 865 DEVICE_ATTR(ce_count, S_IRUGO, mci_ce_count_show, NULL);
 866 DEVICE_ATTR(max_location, S_IRUGO, mci_max_location_show, NULL);
 867
 868 /* memory scrubber attribute file */
 869 DEVICE_ATTR(sdram_scrub_rate, S_IRUGO | S_IWUSR, mci_sdram_scrub_rate_show,
 870         mci_sdram_scrub_rate_store);
 871
 872 static struct attribute *mci_attrs[] = {
 873         &dev_attr_reset_counters.attr,
 874         &dev_attr_mc_name.attr,
 875         &dev_attr_size_mb.attr,
 876         &dev_attr_seconds_since_reset.attr,
 877         &dev_attr_ue_noinfo_count.attr,
 878         &dev_attr_ce_noinfo_count.attr,
 879         &dev_attr_ue_count.attr,
 880         &dev_attr_ce_count.attr,
 881         &dev_attr_sdram_scrub_rate.attr,
 882         &dev_attr_max_location.attr,
 883         NULL
 884 };
 885
 886 static struct attribute_group mci_attr_grp = {
 887         .attrs  = mci_attrs,
 888 };
 889
 890 static const struct attribute_group *mci_attr_groups[] = {
 891         &mci_attr_grp,
 892         NULL
 893 };
 894
 895 static void mci_attr_release(struct device *dev)
 896 {
 897         struct mem_ctl_info *mci = container_of(dev, struct mem_ctl_info, dev);
 898
 899         edac_dbg(1, "Releasing csrow device %s\n", dev_name(dev));
 900         kfree(mci);
 901 }
 902
 903 static struct device_type mci_attr_type = {
 904         .groups         = mci_attr_groups,
 905         .release        = mci_attr_release,
 906 };
 907
 908 #ifdef CONFIG_EDAC_DEBUG
 909 static struct dentry *edac_debugfs;
 910
 911 int __init edac_debugfs_init(void)
 912 {
 913         edac_debugfs = debugfs_create_dir("edac", NULL);
 914         if (IS_ERR(edac_debugfs)) {
 915                 edac_debugfs = NULL;
 916                 return -ENOMEM;
 917         }
 918         return 0;
 919 }
 920
 921 void __exit edac_debugfs_exit(void)
 922 {
 923         debugfs_remove(edac_debugfs);
 924 }
 925
 926 int edac_create_debug_nodes(struct mem_ctl_info *mci)
 927 {
 928         struct dentry *d, *parent;
 929         char name[80];
 930         int i;
 931
 932         if (!edac_debugfs)
 933                 return -ENODEV;
 934
 935         d = debugfs_create_dir(mci->dev.kobj.name, edac_debugfs);
 936         if (!d)
 937                 return -ENOMEM;
 938         parent = d;
 939
 940         for (i = 0; i < mci->n_layers; i++) {
 941                 sprintf(name, "fake_inject_%s",
 942                              edac_layer_name[mci->layers[i].type]);
 943                 d = debugfs_create_u8(name, S_IRUGO | S_IWUSR, parent,
 944                                       &mci->fake_inject_layer[i]);
 945                 if (!d)
 946                         goto nomem;
 947         }
 948
 949         d = debugfs_create_bool("fake_inject_ue", S_IRUGO | S_IWUSR, parent,
 950                                 &mci->fake_inject_ue);
 951         if (!d)
 952                 goto nomem;
 953
 954         d = debugfs_create_u16("fake_inject_count", S_IRUGO | S_IWUSR, parent,
 955                                 &mci->fake_inject_count);
 956         if (!d)
 957                 goto nomem;
 958
 959         d = debugfs_create_file("fake_inject", S_IWUSR, parent,
 960                                 &mci->dev,
 961                                 &debug_fake_inject_fops);
 962         if (!d)
 963                 goto nomem;
 964
 965         mci->debugfs = parent;
 966         return 0;
 967 nomem:
 968         debugfs_remove(mci->debugfs);
 969         return -ENOMEM;
 970 }
 971 #endif
 972
 973 /*
 974  * Create a new Memory Controller kobject instance,
 975  *      mc<id> under the 'mc' directory
 976  *
 977  * Return:
 978  *      0       Success
 979  *      !0      Failure
 980  */
 981 int edac_create_sysfs_mci_device(struct mem_ctl_info *mci)
 982 {
 983         int i, err;
 984
 985         /*
 986          * The memory controller needs its own bus, in order to avoid
 987          * namespace conflicts at /sys/bus/edac.
 988          */
 989         mci->bus.name = kasprintf(GFP_KERNEL, "mc%d", mci->mc_idx);
 990         if (!mci->bus.name)
 991                 return -ENOMEM;
 992         edac_dbg(0, "creating bus %s\n", mci->bus.name);
 993         err = bus_register(&mci->bus);
 994         if (err < 0)
 995                 return err;
 996
 997         /* get the /sys/devices/system/edac subsys reference */
 998         mci->dev.type = &mci_attr_type;
 999         device_initialize(&mci->dev);
1000
1001         mci->dev.parent = mci_pdev;
1002         mci->dev.bus = &mci->bus;
1003         dev_set_name(&mci->dev, "mc%d", mci->mc_idx);
1004         dev_set_drvdata(&mci->dev, mci);
1005         pm_runtime_forbid(&mci->dev);
1006
1007         edac_dbg(0, "creating device %s\n", dev_name(&mci->dev));
1008         err = device_add(&mci->dev);
1009         if (err < 0) {
1010                 bus_unregister(&mci->bus);
1011                 kfree(mci->bus.name);
1012                 return err;
1013         }
1014
1015         /*
1016          * Create the dimm/rank devices
1017          */
1018         for (i = 0; i < mci->tot_dimms; i++) {
1019                 struct dimm_info *dimm = mci->dimms[i];
1020                 /* Only expose populated DIMMs */
1021                 if (dimm->nr_pages == 0)
1022                         continue;
1023 #ifdef CONFIG_EDAC_DEBUG
1024                 edac_dbg(1, "creating dimm%d, located at ", i);
1025                 if (edac_debug_level >= 1) {
1026                         int lay;
1027                         for (lay = 0; lay < mci->n_layers; lay++)
1028                                 printk(KERN_CONT "%s %d ",
1029                                         edac_layer_name[mci->layers[lay].type],
1030                                         dimm->location[lay]);
1031                         printk(KERN_CONT "\n");
1032                 }
1033 #endif
1034                 err = edac_create_dimm_object(mci, dimm, i);
1035                 if (err) {
1036                         edac_dbg(1, "failure: create dimm %d obj\n", i);
1037                         goto fail;
1038                 }
1039         }
1040
1041 #ifdef CONFIG_EDAC_LEGACY_SYSFS
1042         err = edac_create_csrow_objects(mci);
1043         if (err < 0)
1044                 goto fail;
1045 #endif
1046
1047 #ifdef CONFIG_EDAC_DEBUG
1048         edac_create_debug_nodes(mci);
1049 #endif
1050         return 0;
1051
1052 fail:
1053         for (i--; i >= 0; i--) {
1054                 struct dimm_info *dimm = mci->dimms[i];
1055                 if (dimm->nr_pages == 0)
1056                         continue;
1057                 put_device(&dimm->dev);
1058                 device_del(&dimm->dev);
1059         }
1060         put_device(&mci->dev);
1061         device_del(&mci->dev);
1062         bus_unregister(&mci->bus);
1063         kfree(mci->bus.name);
1064         return err;
1065 }
1066
1067 /*
1068  * remove a Memory Controller instance
1069  */
1070 void edac_remove_sysfs_mci_device(struct mem_ctl_info *mci)
1071 {
1072         int i;
1073
1074         edac_dbg(0, "\n");
1075
1076 #ifdef CONFIG_EDAC_DEBUG
1077         debugfs_remove(mci->debugfs);
1078 #endif
1079 #ifdef CONFIG_EDAC_LEGACY_SYSFS
1080         edac_delete_csrow_objects(mci);
1081 #endif
1082
1083         for (i = 0; i < mci->tot_dimms; i++) {
1084                 struct dimm_info *dimm = mci->dimms[i];
1085                 if (dimm->nr_pages == 0)
1086                         continue;
1087                 edac_dbg(0, "removing device %s\n", dev_name(&dimm->dev));
1088                 put_device(&dimm->dev);
1089                 device_del(&dimm->dev);
1090         }
1091 }
1092
1093 void edac_unregister_sysfs(struct mem_ctl_info *mci)
1094 {
1095         edac_dbg(1, "Unregistering device %s\n", dev_name(&mci->dev));
1096         put_device(&mci->dev);
1097         device_del(&mci->dev);
1098         bus_unregister(&mci->bus);
1099         kfree(mci->bus.name);
1100 }
1101
1102 static void mc_attr_release(struct device *dev)
1103 {
1104         /*
1105          * There's no container structure here, as this is just the mci
1106          * parent device, used to create the /sys/devices/mc sysfs node.
1107          * So, there are no attributes on it.
1108          */
1109         edac_dbg(1, "Releasing device %s\n", dev_name(dev));
1110         kfree(dev);
1111 }
1112
1113 static struct device_type mc_attr_type = {
1114         .release        = mc_attr_release,
1115 };
1116 /*
1117  * Init/exit code for the module. Basically, creates/removes /sys/class/rc
1118  */
1119 int __init edac_mc_sysfs_init(void)
1120 {
1121         struct bus_type *edac_subsys;
1122         int err;
1123
1124         /* get the /sys/devices/system/edac subsys reference */
1125         edac_subsys = edac_get_sysfs_subsys();
1126         if (edac_subsys == NULL) {
1127                 edac_dbg(1, "no edac_subsys\n");
1128                 return -EINVAL;
1129         }
1130
1131         mci_pdev = kzalloc(sizeof(*mci_pdev), GFP_KERNEL);
1132
1133         mci_pdev->bus = edac_subsys;
1134         mci_pdev->type = &mc_attr_type;
1135         device_initialize(mci_pdev);
1136         dev_set_name(mci_pdev, "mc");
1137
1138         err = device_add(mci_pdev);
1139         if (err < 0)
1140                 return err;
1141
1142         edac_dbg(0, "device %s created\n", dev_name(mci_pdev));
1143
1144         return 0;
1145 }
1146
1147 void __exit edac_mc_sysfs_exit(void)
1148 {
1149         put_device(mci_pdev);
1150         device_del(mci_pdev);
1151         edac_put_sysfs_subsys();
1152 }