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
  11  *      The entire API were re-written, and ported to use struct device
  12  *
  13  */
  14
  15 #include <linux/ctype.h>
  16 #include <linux/slab.h>
  17 #include <linux/edac.h>
  18 #include <linux/bug.h>
  19 #include <linux/pm_runtime.h>
  20 #include <linux/uaccess.h>
  21
  22 #include "edac_core.h"
  23 #include "edac_module.h"
  24
  25 /* MC EDAC Controls, setable by module parameter, and sysfs */
  26 static int edac_mc_log_ue = 1;
  27 static int edac_mc_log_ce = 1;
  28 static int edac_mc_panic_on_ue;
  29 static int edac_mc_poll_msec = 1000;
  30
  31 /* Getter functions for above */
  32 int edac_mc_get_log_ue(void)
  33 {
  34         return edac_mc_log_ue;
  35 }
  36
  37 int edac_mc_get_log_ce(void)
  38 {
  39         return edac_mc_log_ce;
  40 }
  41
  42 int edac_mc_get_panic_on_ue(void)
  43 {
  44         return edac_mc_panic_on_ue;
  45 }
  46
  47 /* this is temporary */
  48 int edac_mc_get_poll_msec(void)
  49 {
  50         return edac_mc_poll_msec;
  51 }
  52
  53 static int edac_set_poll_msec(const char *val, struct kernel_param *kp)
  54 {
  55         unsigned long l;
  56         int ret;
  57
  58         if (!val)
  59                 return -EINVAL;
  60
  61         ret = kstrtoul(val, 0, &l);
  62         if (ret)
  63                 return ret;
  64
  65         if (l < 1000)
  66                 return -EINVAL;
  67
  68         *((unsigned long *)kp->arg) = l;
  69
  70         /* notify edac_mc engine to reset the poll period */
  71         edac_mc_reset_delay_period(l);
  72
  73         return 0;
  74 }
  75
  76 /* Parameter declarations for above */
  77 module_param(edac_mc_panic_on_ue, int, 0644);
  78 MODULE_PARM_DESC(edac_mc_panic_on_ue, "Panic on uncorrected error: 0=off 1=on");
  79 module_param(edac_mc_log_ue, int, 0644);
  80 MODULE_PARM_DESC(edac_mc_log_ue,
  81                  "Log uncorrectable error to console: 0=off 1=on");
  82 module_param(edac_mc_log_ce, int, 0644);
  83 MODULE_PARM_DESC(edac_mc_log_ce,
  84                  "Log correctable error to console: 0=off 1=on");
  85 module_param_call(edac_mc_poll_msec, edac_set_poll_msec, param_get_int,
  86                   &edac_mc_poll_msec, 0644);
  87 MODULE_PARM_DESC(edac_mc_poll_msec, "Polling period in milliseconds");
  88
  89 static struct device *mci_pdev;
  90
  91 /*
  92  * various constants for Memory Controllers
  93  */
  94 static const char * const mem_types[] = {
  95         [MEM_EMPTY] = "Empty",
  96         [MEM_RESERVED] = "Reserved",
  97         [MEM_UNKNOWN] = "Unknown",
  98         [MEM_FPM] = "FPM",
  99         [MEM_EDO] = "EDO",
 100         [MEM_BEDO] = "BEDO",
 101         [MEM_SDR] = "Unbuffered-SDR",
 102         [MEM_RDR] = "Registered-SDR",
 103         [MEM_DDR] = "Unbuffered-DDR",
 104         [MEM_RDDR] = "Registered-DDR",
 105         [MEM_RMBS] = "RMBS",
 106         [MEM_DDR2] = "Unbuffered-DDR2",
 107         [MEM_FB_DDR2] = "FullyBuffered-DDR2",
 108         [MEM_RDDR2] = "Registered-DDR2",
 109         [MEM_XDR] = "XDR",
 110         [MEM_DDR3] = "Unbuffered-DDR3",
 111         [MEM_RDDR3] = "Registered-DDR3",
 112         [MEM_DDR4] = "Unbuffered-DDR4",
 113         [MEM_RDDR4] = "Registered-DDR4"
 114 };
 115
 116 static const char * const dev_types[] = {
 117         [DEV_UNKNOWN] = "Unknown",
 118         [DEV_X1] = "x1",
 119         [DEV_X2] = "x2",
 120         [DEV_X4] = "x4",
 121         [DEV_X8] = "x8",
 122         [DEV_X16] = "x16",
 123         [DEV_X32] = "x32",
 124         [DEV_X64] = "x64"
 125 };
 126
 127 static const char * const edac_caps[] = {
 128         [EDAC_UNKNOWN] = "Unknown",
 129         [EDAC_NONE] = "None",
 130         [EDAC_RESERVED] = "Reserved",
 131         [EDAC_PARITY] = "PARITY",
 132         [EDAC_EC] = "EC",
 133         [EDAC_SECDED] = "SECDED",
 134         [EDAC_S2ECD2ED] = "S2ECD2ED",
 135         [EDAC_S4ECD4ED] = "S4ECD4ED",
 136         [EDAC_S8ECD8ED] = "S8ECD8ED",
 137         [EDAC_S16ECD16ED] = "S16ECD16ED"
 138 };
 139
 140 #ifdef CONFIG_EDAC_LEGACY_SYSFS
 141 /*
 142  * EDAC sysfs CSROW data structures and methods
 143  */
 144
 145 #define to_csrow(k) container_of(k, struct csrow_info, dev)
 146
 147 /*
 148  * We need it to avoid namespace conflicts between the legacy API
 149  * and the per-dimm/per-rank one
 150  */
 151 #define DEVICE_ATTR_LEGACY(_name, _mode, _show, _store) \
 152         static struct device_attribute dev_attr_legacy_##_name = __ATTR(_name, _mode, _show, _store)
 153
 154 struct dev_ch_attribute {
 155         struct device_attribute attr;
 156         int channel;
 157 };
 158
 159 #define DEVICE_CHANNEL(_name, _mode, _show, _store, _var) \
 160         static struct dev_ch_attribute dev_attr_legacy_##_name = \
 161                 { __ATTR(_name, _mode, _show, _store), (_var) }
 162
 163 #define to_channel(k) (container_of(k, struct dev_ch_attribute, attr)->channel)
 164
 165 /* Set of more default csrow<id> attribute show/store functions */
 166 static ssize_t csrow_ue_count_show(struct device *dev,
 167                                    struct device_attribute *mattr, char *data)
 168 {
 169         struct csrow_info *csrow = to_csrow(dev);
 170
 171         return sprintf(data, "%u\n", csrow->ue_count);
 172 }
 173
 174 static ssize_t csrow_ce_count_show(struct device *dev,
 175                                    struct device_attribute *mattr, char *data)
 176 {
 177         struct csrow_info *csrow = to_csrow(dev);
 178
 179         return sprintf(data, "%u\n", csrow->ce_count);
 180 }
 181
 182 static ssize_t csrow_size_show(struct device *dev,
 183                                struct device_attribute *mattr, char *data)
 184 {
 185         struct csrow_info *csrow = to_csrow(dev);
 186         int i;
 187         u32 nr_pages = 0;
 188
 189         for (i = 0; i < csrow->nr_channels; i++)
 190                 nr_pages += csrow->channels[i]->dimm->nr_pages;
 191         return sprintf(data, "%u\n", PAGES_TO_MiB(nr_pages));
 192 }
 193
 194 static ssize_t csrow_mem_type_show(struct device *dev,
 195                                    struct device_attribute *mattr, char *data)
 196 {
 197         struct csrow_info *csrow = to_csrow(dev);
 198
 199         return sprintf(data, "%s\n", mem_types[csrow->channels[0]->dimm->mtype]);
 200 }
 201
 202 static ssize_t csrow_dev_type_show(struct device *dev,
 203                                    struct device_attribute *mattr, char *data)
 204 {
 205         struct csrow_info *csrow = to_csrow(dev);
 206
 207         return sprintf(data, "%s\n", dev_types[csrow->channels[0]->dimm->dtype]);
 208 }
 209
 210 static ssize_t csrow_edac_mode_show(struct device *dev,
 211                                     struct device_attribute *mattr,
 212                                     char *data)
 213 {
 214         struct csrow_info *csrow = to_csrow(dev);
 215
 216         return sprintf(data, "%s\n", edac_caps[csrow->channels[0]->dimm->edac_mode]);
 217 }
 218
 219 /* show/store functions for DIMM Label attributes */
 220 static ssize_t channel_dimm_label_show(struct device *dev,
 221                                        struct device_attribute *mattr,
 222                                        char *data)
 223 {
 224         struct csrow_info *csrow = to_csrow(dev);
 225         unsigned chan = to_channel(mattr);
 226         struct rank_info *rank = csrow->channels[chan];
 227
 228         /* if field has not been initialized, there is nothing to send */
 229         if (!rank->dimm->label[0])
 230                 return 0;
 231
 232         return snprintf(data, sizeof(rank->dimm->label) + 1, "%s\n",
 233                         rank->dimm->label);
 234 }
 235
 236 static ssize_t channel_dimm_label_store(struct device *dev,
 237                                         struct device_attribute *mattr,
 238                                         const char *data, size_t count)
 239 {
 240         struct csrow_info *csrow = to_csrow(dev);
 241         unsigned chan = to_channel(mattr);
 242         struct rank_info *rank = csrow->channels[chan];
 243         size_t copy_count = count;
 244
 245         if (count == 0)
 246                 return -EINVAL;
 247
 248         if (data[count - 1] == '\0' || data[count - 1] == '\n')
 249                 copy_count -= 1;
 250
 251         if (copy_count == 0 || copy_count >= sizeof(rank->dimm->label))
 252                 return -EINVAL;
 253
 254         strncpy(rank->dimm->label, data, copy_count);
 255         rank->dimm->label[copy_count] = '\0';
 256
 257         return count;
 258 }
 259
 260 /* show function for dynamic chX_ce_count attribute */
 261 static ssize_t channel_ce_count_show(struct device *dev,
 262                                      struct device_attribute *mattr, char *data)
 263 {
 264         struct csrow_info *csrow = to_csrow(dev);
 265         unsigned chan = to_channel(mattr);
 266         struct rank_info *rank = csrow->channels[chan];
 267
 268         return sprintf(data, "%u\n", rank->ce_count);
 269 }
 270
 271 /* cwrow<id>/attribute files */
 272 DEVICE_ATTR_LEGACY(size_mb, S_IRUGO, csrow_size_show, NULL);
 273 DEVICE_ATTR_LEGACY(dev_type, S_IRUGO, csrow_dev_type_show, NULL);
 274 DEVICE_ATTR_LEGACY(mem_type, S_IRUGO, csrow_mem_type_show, NULL);
 275 DEVICE_ATTR_LEGACY(edac_mode, S_IRUGO, csrow_edac_mode_show, NULL);
 276 DEVICE_ATTR_LEGACY(ue_count, S_IRUGO, csrow_ue_count_show, NULL);
 277 DEVICE_ATTR_LEGACY(ce_count, S_IRUGO, csrow_ce_count_show, NULL);
 278
 279 /* default attributes of the CSROW<id> object */
 280 static struct attribute *csrow_attrs[] = {
 281         &dev_attr_legacy_dev_type.attr,
 282         &dev_attr_legacy_mem_type.attr,
 283         &dev_attr_legacy_edac_mode.attr,
 284         &dev_attr_legacy_size_mb.attr,
 285         &dev_attr_legacy_ue_count.attr,
 286         &dev_attr_legacy_ce_count.attr,
 287         NULL,
 288 };
 289
 290 static struct attribute_group csrow_attr_grp = {
 291         .attrs  = csrow_attrs,
 292 };
 293
 294 static const struct attribute_group *csrow_attr_groups[] = {
 295         &csrow_attr_grp,
 296         NULL
 297 };
 298
 299 static void csrow_attr_release(struct device *dev)
 300 {
 301         struct csrow_info *csrow = container_of(dev, struct csrow_info, dev);
 302
 303         edac_dbg(1, "Releasing csrow device %s\n", dev_name(dev));
 304         kfree(csrow);
 305 }
 306
 307 static struct device_type csrow_attr_type = {
 308         .groups         = csrow_attr_groups,
 309         .release        = csrow_attr_release,
 310 };
 311
 312 /*
 313  * possible dynamic channel DIMM Label attribute files
 314  *
 315  */
 316
 317 DEVICE_CHANNEL(ch0_dimm_label, S_IRUGO | S_IWUSR,
 318         channel_dimm_label_show, channel_dimm_label_store, 0);
 319 DEVICE_CHANNEL(ch1_dimm_label, S_IRUGO | S_IWUSR,
 320         channel_dimm_label_show, channel_dimm_label_store, 1);
 321 DEVICE_CHANNEL(ch2_dimm_label, S_IRUGO | S_IWUSR,
 322         channel_dimm_label_show, channel_dimm_label_store, 2);
 323 DEVICE_CHANNEL(ch3_dimm_label, S_IRUGO | S_IWUSR,
 324         channel_dimm_label_show, channel_dimm_label_store, 3);
 325 DEVICE_CHANNEL(ch4_dimm_label, S_IRUGO | S_IWUSR,
 326         channel_dimm_label_show, channel_dimm_label_store, 4);
 327 DEVICE_CHANNEL(ch5_dimm_label, S_IRUGO | S_IWUSR,
 328         channel_dimm_label_show, channel_dimm_label_store, 5);
 329
 330 /* Total possible dynamic DIMM Label attribute file table */
 331 static struct attribute *dynamic_csrow_dimm_attr[] = {
 332         &dev_attr_legacy_ch0_dimm_label.attr.attr,
 333         &dev_attr_legacy_ch1_dimm_label.attr.attr,
 334         &dev_attr_legacy_ch2_dimm_label.attr.attr,
 335         &dev_attr_legacy_ch3_dimm_label.attr.attr,
 336         &dev_attr_legacy_ch4_dimm_label.attr.attr,
 337         &dev_attr_legacy_ch5_dimm_label.attr.attr,
 338         NULL
 339 };
 340
 341 /* possible dynamic channel ce_count attribute files */
 342 DEVICE_CHANNEL(ch0_ce_count, S_IRUGO,
 343                    channel_ce_count_show, NULL, 0);
 344 DEVICE_CHANNEL(ch1_ce_count, S_IRUGO,
 345                    channel_ce_count_show, NULL, 1);
 346 DEVICE_CHANNEL(ch2_ce_count, S_IRUGO,
 347                    channel_ce_count_show, NULL, 2);
 348 DEVICE_CHANNEL(ch3_ce_count, S_IRUGO,
 349                    channel_ce_count_show, NULL, 3);
 350 DEVICE_CHANNEL(ch4_ce_count, S_IRUGO,
 351                    channel_ce_count_show, NULL, 4);
 352 DEVICE_CHANNEL(ch5_ce_count, S_IRUGO,
 353                    channel_ce_count_show, NULL, 5);
 354
 355 /* Total possible dynamic ce_count attribute file table */
 356 static struct attribute *dynamic_csrow_ce_count_attr[] = {
 357         &dev_attr_legacy_ch0_ce_count.attr.attr,
 358         &dev_attr_legacy_ch1_ce_count.attr.attr,
 359         &dev_attr_legacy_ch2_ce_count.attr.attr,
 360         &dev_attr_legacy_ch3_ce_count.attr.attr,
 361         &dev_attr_legacy_ch4_ce_count.attr.attr,
 362         &dev_attr_legacy_ch5_ce_count.attr.attr,
 363         NULL
 364 };
 365
 366 static umode_t csrow_dev_is_visible(struct kobject *kobj,
 367                                     struct attribute *attr, int idx)
 368 {
 369         struct device *dev = kobj_to_dev(kobj);
 370         struct csrow_info *csrow = container_of(dev, struct csrow_info, dev);
 371
 372         if (idx >= csrow->nr_channels)
 373                 return 0;
 374         /* Only expose populated DIMMs */
 375         if (!csrow->channels[idx]->dimm->nr_pages)
 376                 return 0;
 377         return attr->mode;
 378 }
 379
 380
 381 static const struct attribute_group csrow_dev_dimm_group = {
 382         .attrs = dynamic_csrow_dimm_attr,
 383         .is_visible = csrow_dev_is_visible,
 384 };
 385
 386 static const struct attribute_group csrow_dev_ce_count_group = {
 387         .attrs = dynamic_csrow_ce_count_attr,
 388         .is_visible = csrow_dev_is_visible,
 389 };
 390
 391 static const struct attribute_group *csrow_dev_groups[] = {
 392         &csrow_dev_dimm_group,
 393         &csrow_dev_ce_count_group,
 394         NULL
 395 };
 396
 397 static inline int nr_pages_per_csrow(struct csrow_info *csrow)
 398 {
 399         int chan, nr_pages = 0;
 400
 401         for (chan = 0; chan < csrow->nr_channels; chan++)
 402                 nr_pages += csrow->channels[chan]->dimm->nr_pages;
 403
 404         return nr_pages;
 405 }
 406
 407 /* Create a CSROW object under specifed edac_mc_device */
 408 static int edac_create_csrow_object(struct mem_ctl_info *mci,
 409                                     struct csrow_info *csrow, int index)
 410 {
 411         csrow->dev.type = &csrow_attr_type;
 412         csrow->dev.bus = mci->bus;
 413         csrow->dev.groups = csrow_dev_groups;
 414         device_initialize(&csrow->dev);
 415         csrow->dev.parent = &mci->dev;
 416         csrow->mci = mci;
 417         dev_set_name(&csrow->dev, "csrow%d", index);
 418         dev_set_drvdata(&csrow->dev, csrow);
 419
 420         edac_dbg(0, "creating (virtual) csrow node %s\n",
 421                  dev_name(&csrow->dev));
 422
 423         return device_add(&csrow->dev);
 424 }
 425
 426 /* Create a CSROW object under specifed edac_mc_device */
 427 static int edac_create_csrow_objects(struct mem_ctl_info *mci)
 428 {
 429         int err, i;
 430         struct csrow_info *csrow;
 431
 432         for (i = 0; i < mci->nr_csrows; i++) {
 433                 csrow = mci->csrows[i];
 434                 if (!nr_pages_per_csrow(csrow))
 435                         continue;
 436                 err = edac_create_csrow_object(mci, mci->csrows[i], i);
 437                 if (err < 0) {
 438                         edac_dbg(1,
 439                                  "failure: create csrow objects for csrow %d\n",
 440                                  i);
 441                         goto error;
 442                 }
 443         }
 444         return 0;
 445
 446 error:
 447         for (--i; i >= 0; i--) {
 448                 csrow = mci->csrows[i];
 449                 if (!nr_pages_per_csrow(csrow))
 450                         continue;
 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;
 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                 device_unregister(&mci->csrows[i]->dev);
 467         }
 468 }
 469 #endif
 470
 471 /*
 472  * Per-dimm (or per-rank) devices
 473  */
 474
 475 #define to_dimm(k) container_of(k, struct dimm_info, dev)
 476
 477 /* show/store functions for DIMM Label attributes */
 478 static ssize_t dimmdev_location_show(struct device *dev,
 479                                      struct device_attribute *mattr, char *data)
 480 {
 481         struct dimm_info *dimm = to_dimm(dev);
 482
 483         return edac_dimm_info_location(dimm, data, PAGE_SIZE);
 484 }
 485
 486 static ssize_t dimmdev_label_show(struct device *dev,
 487                                   struct device_attribute *mattr, char *data)
 488 {
 489         struct dimm_info *dimm = to_dimm(dev);
 490
 491         /* if field has not been initialized, there is nothing to send */
 492         if (!dimm->label[0])
 493                 return 0;
 494
 495         return snprintf(data, sizeof(dimm->label) + 1, "%s\n", dimm->label);
 496 }
 497
 498 static ssize_t dimmdev_label_store(struct device *dev,
 499                                    struct device_attribute *mattr,
 500                                    const char *data,
 501                                    size_t count)
 502 {
 503         struct dimm_info *dimm = to_dimm(dev);
 504         size_t copy_count = count;
 505
 506         if (count == 0)
 507                 return -EINVAL;
 508
 509         if (data[count - 1] == '\0' || data[count - 1] == '\n')
 510                 copy_count -= 1;
 511
 512         if (copy_count == 0 || copy_count >= sizeof(dimm->label))
 513                 return -EINVAL;
 514
 515         strncpy(dimm->label, data, copy_count);
 516         dimm->label[copy_count] = '\0';
 517
 518         return count;
 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->csbased)
 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 (kstrtoul(data, 10, &bandwidth) < 0)
 679                 return -EINVAL;
 680
 681         new_bw = mci->set_sdram_scrub_rate(mci, bandwidth);
 682         if (new_bw < 0) {
 683                 edac_printk(KERN_WARNING, EDAC_MC,
 684                             "Error setting scrub rate to: %lu\n", bandwidth);
 685                 return -EINVAL;
 686         }
 687
 688         return count;
 689 }
 690
 691 /*
 692  * ->get_sdram_scrub_rate() return value semantics same as above.
 693  */
 694 static ssize_t mci_sdram_scrub_rate_show(struct device *dev,
 695                                          struct device_attribute *mattr,
 696                                          char *data)
 697 {
 698         struct mem_ctl_info *mci = to_mci(dev);
 699         int bandwidth = 0;
 700
 701         bandwidth = mci->get_sdram_scrub_rate(mci);
 702         if (bandwidth < 0) {
 703                 edac_printk(KERN_DEBUG, EDAC_MC, "Error reading scrub rate\n");
 704                 return bandwidth;
 705         }
 706
 707         return sprintf(data, "%d\n", bandwidth);
 708 }
 709
 710 /* default attribute files for the MCI object */
 711 static ssize_t mci_ue_count_show(struct device *dev,
 712                                  struct device_attribute *mattr,
 713                                  char *data)
 714 {
 715         struct mem_ctl_info *mci = to_mci(dev);
 716
 717         return sprintf(data, "%d\n", mci->ue_mc);
 718 }
 719
 720 static ssize_t mci_ce_count_show(struct device *dev,
 721                                  struct device_attribute *mattr,
 722                                  char *data)
 723 {
 724         struct mem_ctl_info *mci = to_mci(dev);
 725
 726         return sprintf(data, "%d\n", mci->ce_mc);
 727 }
 728
 729 static ssize_t mci_ce_noinfo_show(struct device *dev,
 730                                   struct device_attribute *mattr,
 731                                   char *data)
 732 {
 733         struct mem_ctl_info *mci = to_mci(dev);
 734
 735         return sprintf(data, "%d\n", mci->ce_noinfo_count);
 736 }
 737
 738 static ssize_t mci_ue_noinfo_show(struct device *dev,
 739                                   struct device_attribute *mattr,
 740                                   char *data)
 741 {
 742         struct mem_ctl_info *mci = to_mci(dev);
 743
 744         return sprintf(data, "%d\n", mci->ue_noinfo_count);
 745 }
 746
 747 static ssize_t mci_seconds_show(struct device *dev,
 748                                 struct device_attribute *mattr,
 749                                 char *data)
 750 {
 751         struct mem_ctl_info *mci = to_mci(dev);
 752
 753         return sprintf(data, "%ld\n", (jiffies - mci->start_time) / HZ);
 754 }
 755
 756 static ssize_t mci_ctl_name_show(struct device *dev,
 757                                  struct device_attribute *mattr,
 758                                  char *data)
 759 {
 760         struct mem_ctl_info *mci = to_mci(dev);
 761
 762         return sprintf(data, "%s\n", mci->ctl_name);
 763 }
 764
 765 static ssize_t mci_size_mb_show(struct device *dev,
 766                                 struct device_attribute *mattr,
 767                                 char *data)
 768 {
 769         struct mem_ctl_info *mci = to_mci(dev);
 770         int total_pages = 0, csrow_idx, j;
 771
 772         for (csrow_idx = 0; csrow_idx < mci->nr_csrows; csrow_idx++) {
 773                 struct csrow_info *csrow = mci->csrows[csrow_idx];
 774
 775                 for (j = 0; j < csrow->nr_channels; j++) {
 776                         struct dimm_info *dimm = csrow->channels[j]->dimm;
 777
 778                         total_pages += dimm->nr_pages;
 779                 }
 780         }
 781
 782         return sprintf(data, "%u\n", PAGES_TO_MiB(total_pages));
 783 }
 784
 785 static ssize_t mci_max_location_show(struct device *dev,
 786                                      struct device_attribute *mattr,
 787                                      char *data)
 788 {
 789         struct mem_ctl_info *mci = to_mci(dev);
 790         int i;
 791         char *p = data;
 792
 793         for (i = 0; i < mci->n_layers; i++) {
 794                 p += sprintf(p, "%s %d ",
 795                              edac_layer_name[mci->layers[i].type],
 796                              mci->layers[i].size - 1);
 797         }
 798
 799         return p - data;
 800 }
 801
 802 /* default Control file */
 803 static DEVICE_ATTR(reset_counters, S_IWUSR, NULL, mci_reset_counters_store);
 804
 805 /* default Attribute files */
 806 static DEVICE_ATTR(mc_name, S_IRUGO, mci_ctl_name_show, NULL);
 807 static DEVICE_ATTR(size_mb, S_IRUGO, mci_size_mb_show, NULL);
 808 static DEVICE_ATTR(seconds_since_reset, S_IRUGO, mci_seconds_show, NULL);
 809 static DEVICE_ATTR(ue_noinfo_count, S_IRUGO, mci_ue_noinfo_show, NULL);
 810 static DEVICE_ATTR(ce_noinfo_count, S_IRUGO, mci_ce_noinfo_show, NULL);
 811 static DEVICE_ATTR(ue_count, S_IRUGO, mci_ue_count_show, NULL);
 812 static DEVICE_ATTR(ce_count, S_IRUGO, mci_ce_count_show, NULL);
 813 static DEVICE_ATTR(max_location, S_IRUGO, mci_max_location_show, NULL);
 814
 815 /* memory scrubber attribute file */
 816 DEVICE_ATTR(sdram_scrub_rate, 0, mci_sdram_scrub_rate_show,
 817             mci_sdram_scrub_rate_store); /* umode set later in is_visible */
 818
 819 static struct attribute *mci_attrs[] = {
 820         &dev_attr_reset_counters.attr,
 821         &dev_attr_mc_name.attr,
 822         &dev_attr_size_mb.attr,
 823         &dev_attr_seconds_since_reset.attr,
 824         &dev_attr_ue_noinfo_count.attr,
 825         &dev_attr_ce_noinfo_count.attr,
 826         &dev_attr_ue_count.attr,
 827         &dev_attr_ce_count.attr,
 828         &dev_attr_max_location.attr,
 829         &dev_attr_sdram_scrub_rate.attr,
 830         NULL
 831 };
 832
 833 static umode_t mci_attr_is_visible(struct kobject *kobj,
 834                                    struct attribute *attr, int idx)
 835 {
 836         struct device *dev = kobj_to_dev(kobj);
 837         struct mem_ctl_info *mci = to_mci(dev);
 838         umode_t mode = 0;
 839
 840         if (attr != &dev_attr_sdram_scrub_rate.attr)
 841                 return attr->mode;
 842         if (mci->get_sdram_scrub_rate)
 843                 mode |= S_IRUGO;
 844         if (mci->set_sdram_scrub_rate)
 845                 mode |= S_IWUSR;
 846         return mode;
 847 }
 848
 849 static struct attribute_group mci_attr_grp = {
 850         .attrs  = mci_attrs,
 851         .is_visible = mci_attr_is_visible,
 852 };
 853
 854 static const struct attribute_group *mci_attr_groups[] = {
 855         &mci_attr_grp,
 856         NULL
 857 };
 858
 859 static void mci_attr_release(struct device *dev)
 860 {
 861         struct mem_ctl_info *mci = container_of(dev, struct mem_ctl_info, dev);
 862
 863         edac_dbg(1, "Releasing csrow device %s\n", dev_name(dev));
 864         kfree(mci);
 865 }
 866
 867 static struct device_type mci_attr_type = {
 868         .groups         = mci_attr_groups,
 869         .release        = mci_attr_release,
 870 };
 871
 872 /*
 873  * Create a new Memory Controller kobject instance,
 874  *      mc<id> under the 'mc' directory
 875  *
 876  * Return:
 877  *      0       Success
 878  *      !0      Failure
 879  */
 880 int edac_create_sysfs_mci_device(struct mem_ctl_info *mci,
 881                                  const struct attribute_group **groups)
 882 {
 883         int i, err;
 884
 885         /*
 886          * The memory controller needs its own bus, in order to avoid
 887          * namespace conflicts at /sys/bus/edac.
 888          */
 889         mci->bus->name = kasprintf(GFP_KERNEL, "mc%d", mci->mc_idx);
 890         if (!mci->bus->name)
 891                 return -ENOMEM;
 892
 893         edac_dbg(0, "creating bus %s\n", mci->bus->name);
 894
 895         err = bus_register(mci->bus);
 896         if (err < 0)
 897                 goto fail_free_name;
 898
 899         /* get the /sys/devices/system/edac subsys reference */
 900         mci->dev.type = &mci_attr_type;
 901         device_initialize(&mci->dev);
 902
 903         mci->dev.parent = mci_pdev;
 904         mci->dev.bus = mci->bus;
 905         mci->dev.groups = groups;
 906         dev_set_name(&mci->dev, "mc%d", mci->mc_idx);
 907         dev_set_drvdata(&mci->dev, mci);
 908         pm_runtime_forbid(&mci->dev);
 909
 910         edac_dbg(0, "creating device %s\n", dev_name(&mci->dev));
 911         err = device_add(&mci->dev);
 912         if (err < 0) {
 913                 edac_dbg(1, "failure: create device %s\n", dev_name(&mci->dev));
 914                 goto fail_unregister_bus;
 915         }
 916
 917         /*
 918          * Create the dimm/rank devices
 919          */
 920         for (i = 0; i < mci->tot_dimms; i++) {
 921                 struct dimm_info *dimm = mci->dimms[i];
 922                 /* Only expose populated DIMMs */
 923                 if (!dimm->nr_pages)
 924                         continue;
 925
 926 #ifdef CONFIG_EDAC_DEBUG
 927                 edac_dbg(1, "creating dimm%d, located at ", i);
 928                 if (edac_debug_level >= 1) {
 929                         int lay;
 930                         for (lay = 0; lay < mci->n_layers; lay++)
 931                                 printk(KERN_CONT "%s %d ",
 932                                         edac_layer_name[mci->layers[lay].type],
 933                                         dimm->location[lay]);
 934                         printk(KERN_CONT "\n");
 935                 }
 936 #endif
 937                 err = edac_create_dimm_object(mci, dimm, i);
 938                 if (err) {
 939                         edac_dbg(1, "failure: create dimm %d obj\n", i);
 940                         goto fail_unregister_dimm;
 941                 }
 942         }
 943
 944 #ifdef CONFIG_EDAC_LEGACY_SYSFS
 945         err = edac_create_csrow_objects(mci);
 946         if (err < 0)
 947                 goto fail_unregister_dimm;
 948 #endif
 949
 950         edac_create_debugfs_nodes(mci);
 951         return 0;
 952
 953 fail_unregister_dimm:
 954         for (i--; i >= 0; i--) {
 955                 struct dimm_info *dimm = mci->dimms[i];
 956                 if (!dimm->nr_pages)
 957                         continue;
 958
 959                 device_unregister(&dimm->dev);
 960         }
 961         device_unregister(&mci->dev);
 962 fail_unregister_bus:
 963         bus_unregister(mci->bus);
 964 fail_free_name:
 965         kfree(mci->bus->name);
 966         return err;
 967 }
 968
 969 /*
 970  * remove a Memory Controller instance
 971  */
 972 void edac_remove_sysfs_mci_device(struct mem_ctl_info *mci)
 973 {
 974         int i;
 975
 976         edac_dbg(0, "\n");
 977
 978 #ifdef CONFIG_EDAC_DEBUG
 979         edac_debugfs_remove_recursive(mci->debugfs);
 980 #endif
 981 #ifdef CONFIG_EDAC_LEGACY_SYSFS
 982         edac_delete_csrow_objects(mci);
 983 #endif
 984
 985         for (i = 0; i < mci->tot_dimms; i++) {
 986                 struct dimm_info *dimm = mci->dimms[i];
 987                 if (dimm->nr_pages == 0)
 988                         continue;
 989                 edac_dbg(0, "removing device %s\n", dev_name(&dimm->dev));
 990                 device_unregister(&dimm->dev);
 991         }
 992 }
 993
 994 void edac_unregister_sysfs(struct mem_ctl_info *mci)
 995 {
 996         edac_dbg(1, "Unregistering device %s\n", dev_name(&mci->dev));
 997         device_unregister(&mci->dev);
 998         bus_unregister(mci->bus);
 999         kfree(mci->bus->name);
1000 }
1001
1002 static void mc_attr_release(struct device *dev)
1003 {
1004         /*
1005          * There's no container structure here, as this is just the mci
1006          * parent device, used to create the /sys/devices/mc sysfs node.
1007          * So, there are no attributes on it.
1008          */
1009         edac_dbg(1, "Releasing device %s\n", dev_name(dev));
1010         kfree(dev);
1011 }
1012
1013 static struct device_type mc_attr_type = {
1014         .release        = mc_attr_release,
1015 };
1016 /*
1017  * Init/exit code for the module. Basically, creates/removes /sys/class/rc
1018  */
1019 int __init edac_mc_sysfs_init(void)
1020 {
1021         struct bus_type *edac_subsys;
1022         int err;
1023
1024         /* get the /sys/devices/system/edac subsys reference */
1025         edac_subsys = edac_get_sysfs_subsys();
1026         if (edac_subsys == NULL) {
1027                 edac_dbg(1, "no edac_subsys\n");
1028                 err = -EINVAL;
1029                 goto out;
1030         }
1031
1032         mci_pdev = kzalloc(sizeof(*mci_pdev), GFP_KERNEL);
1033         if (!mci_pdev) {
1034                 err = -ENOMEM;
1035                 goto out_put_sysfs;
1036         }
1037
1038         mci_pdev->bus = edac_subsys;
1039         mci_pdev->type = &mc_attr_type;
1040         device_initialize(mci_pdev);
1041         dev_set_name(mci_pdev, "mc");
1042
1043         err = device_add(mci_pdev);
1044         if (err < 0)
1045                 goto out_dev_free;
1046
1047         edac_dbg(0, "device %s created\n", dev_name(mci_pdev));
1048
1049         return 0;
1050
1051  out_dev_free:
1052         kfree(mci_pdev);
1053  out_put_sysfs:
1054         edac_put_sysfs_subsys();
1055  out:
1056         return err;
1057 }
1058
1059 void edac_mc_sysfs_exit(void)
1060 {
1061         device_unregister(mci_pdev);
1062         edac_put_sysfs_subsys();
1063 }