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_mc.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 const 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 const 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 DEVICE_CHANNEL(ch0_dimm_label, S_IRUGO | S_IWUSR,
 317         channel_dimm_label_show, channel_dimm_label_store, 0);
 318 DEVICE_CHANNEL(ch1_dimm_label, S_IRUGO | S_IWUSR,
 319         channel_dimm_label_show, channel_dimm_label_store, 1);
 320 DEVICE_CHANNEL(ch2_dimm_label, S_IRUGO | S_IWUSR,
 321         channel_dimm_label_show, channel_dimm_label_store, 2);
 322 DEVICE_CHANNEL(ch3_dimm_label, S_IRUGO | S_IWUSR,
 323         channel_dimm_label_show, channel_dimm_label_store, 3);
 324 DEVICE_CHANNEL(ch4_dimm_label, S_IRUGO | S_IWUSR,
 325         channel_dimm_label_show, channel_dimm_label_store, 4);
 326 DEVICE_CHANNEL(ch5_dimm_label, S_IRUGO | S_IWUSR,
 327         channel_dimm_label_show, channel_dimm_label_store, 5);
 328 DEVICE_CHANNEL(ch6_dimm_label, S_IRUGO | S_IWUSR,
 329         channel_dimm_label_show, channel_dimm_label_store, 6);
 330 DEVICE_CHANNEL(ch7_dimm_label, S_IRUGO | S_IWUSR,
 331         channel_dimm_label_show, channel_dimm_label_store, 7);
 332
 333 /* Total possible dynamic DIMM Label attribute file table */
 334 static struct attribute *dynamic_csrow_dimm_attr[] = {
 335         &dev_attr_legacy_ch0_dimm_label.attr.attr,
 336         &dev_attr_legacy_ch1_dimm_label.attr.attr,
 337         &dev_attr_legacy_ch2_dimm_label.attr.attr,
 338         &dev_attr_legacy_ch3_dimm_label.attr.attr,
 339         &dev_attr_legacy_ch4_dimm_label.attr.attr,
 340         &dev_attr_legacy_ch5_dimm_label.attr.attr,
 341         &dev_attr_legacy_ch6_dimm_label.attr.attr,
 342         &dev_attr_legacy_ch7_dimm_label.attr.attr,
 343         NULL
 344 };
 345
 346 /* possible dynamic channel ce_count attribute files */
 347 DEVICE_CHANNEL(ch0_ce_count, S_IRUGO,
 348                    channel_ce_count_show, NULL, 0);
 349 DEVICE_CHANNEL(ch1_ce_count, S_IRUGO,
 350                    channel_ce_count_show, NULL, 1);
 351 DEVICE_CHANNEL(ch2_ce_count, S_IRUGO,
 352                    channel_ce_count_show, NULL, 2);
 353 DEVICE_CHANNEL(ch3_ce_count, S_IRUGO,
 354                    channel_ce_count_show, NULL, 3);
 355 DEVICE_CHANNEL(ch4_ce_count, S_IRUGO,
 356                    channel_ce_count_show, NULL, 4);
 357 DEVICE_CHANNEL(ch5_ce_count, S_IRUGO,
 358                    channel_ce_count_show, NULL, 5);
 359 DEVICE_CHANNEL(ch6_ce_count, S_IRUGO,
 360                    channel_ce_count_show, NULL, 6);
 361 DEVICE_CHANNEL(ch7_ce_count, S_IRUGO,
 362                    channel_ce_count_show, NULL, 7);
 363
 364 /* Total possible dynamic ce_count attribute file table */
 365 static struct attribute *dynamic_csrow_ce_count_attr[] = {
 366         &dev_attr_legacy_ch0_ce_count.attr.attr,
 367         &dev_attr_legacy_ch1_ce_count.attr.attr,
 368         &dev_attr_legacy_ch2_ce_count.attr.attr,
 369         &dev_attr_legacy_ch3_ce_count.attr.attr,
 370         &dev_attr_legacy_ch4_ce_count.attr.attr,
 371         &dev_attr_legacy_ch5_ce_count.attr.attr,
 372         &dev_attr_legacy_ch6_ce_count.attr.attr,
 373         &dev_attr_legacy_ch7_ce_count.attr.attr,
 374         NULL
 375 };
 376
 377 static umode_t csrow_dev_is_visible(struct kobject *kobj,
 378                                     struct attribute *attr, int idx)
 379 {
 380         struct device *dev = kobj_to_dev(kobj);
 381         struct csrow_info *csrow = container_of(dev, struct csrow_info, dev);
 382
 383         if (idx >= csrow->nr_channels)
 384                 return 0;
 385
 386         if (idx >= ARRAY_SIZE(dynamic_csrow_ce_count_attr) - 1) {
 387                 WARN_ONCE(1, "idx: %d\n", idx);
 388                 return 0;
 389         }
 390
 391         /* Only expose populated DIMMs */
 392         if (!csrow->channels[idx]->dimm->nr_pages)
 393                 return 0;
 394
 395         return attr->mode;
 396 }
 397
 398
 399 static const struct attribute_group csrow_dev_dimm_group = {
 400         .attrs = dynamic_csrow_dimm_attr,
 401         .is_visible = csrow_dev_is_visible,
 402 };
 403
 404 static const struct attribute_group csrow_dev_ce_count_group = {
 405         .attrs = dynamic_csrow_ce_count_attr,
 406         .is_visible = csrow_dev_is_visible,
 407 };
 408
 409 static const struct attribute_group *csrow_dev_groups[] = {
 410         &csrow_dev_dimm_group,
 411         &csrow_dev_ce_count_group,
 412         NULL
 413 };
 414
 415 static inline int nr_pages_per_csrow(struct csrow_info *csrow)
 416 {
 417         int chan, nr_pages = 0;
 418
 419         for (chan = 0; chan < csrow->nr_channels; chan++)
 420                 nr_pages += csrow->channels[chan]->dimm->nr_pages;
 421
 422         return nr_pages;
 423 }
 424
 425 /* Create a CSROW object under specifed edac_mc_device */
 426 static int edac_create_csrow_object(struct mem_ctl_info *mci,
 427                                     struct csrow_info *csrow, int index)
 428 {
 429         csrow->dev.type = &csrow_attr_type;
 430         csrow->dev.bus = mci->bus;
 431         csrow->dev.groups = csrow_dev_groups;
 432         device_initialize(&csrow->dev);
 433         csrow->dev.parent = &mci->dev;
 434         csrow->mci = mci;
 435         dev_set_name(&csrow->dev, "csrow%d", index);
 436         dev_set_drvdata(&csrow->dev, csrow);
 437
 438         edac_dbg(0, "creating (virtual) csrow node %s\n",
 439                  dev_name(&csrow->dev));
 440
 441         return device_add(&csrow->dev);
 442 }
 443
 444 /* Create a CSROW object under specifed edac_mc_device */
 445 static int edac_create_csrow_objects(struct mem_ctl_info *mci)
 446 {
 447         int err, i;
 448         struct csrow_info *csrow;
 449
 450         for (i = 0; i < mci->nr_csrows; i++) {
 451                 csrow = mci->csrows[i];
 452                 if (!nr_pages_per_csrow(csrow))
 453                         continue;
 454                 err = edac_create_csrow_object(mci, mci->csrows[i], i);
 455                 if (err < 0) {
 456                         edac_dbg(1,
 457                                  "failure: create csrow objects for csrow %d\n",
 458                                  i);
 459                         goto error;
 460                 }
 461         }
 462         return 0;
 463
 464 error:
 465         for (--i; i >= 0; i--) {
 466                 csrow = mci->csrows[i];
 467                 if (!nr_pages_per_csrow(csrow))
 468                         continue;
 469                 put_device(&mci->csrows[i]->dev);
 470         }
 471
 472         return err;
 473 }
 474
 475 static void edac_delete_csrow_objects(struct mem_ctl_info *mci)
 476 {
 477         int i;
 478         struct csrow_info *csrow;
 479
 480         for (i = mci->nr_csrows - 1; i >= 0; i--) {
 481                 csrow = mci->csrows[i];
 482                 if (!nr_pages_per_csrow(csrow))
 483                         continue;
 484                 device_unregister(&mci->csrows[i]->dev);
 485         }
 486 }
 487 #endif
 488
 489 /*
 490  * Per-dimm (or per-rank) devices
 491  */
 492
 493 #define to_dimm(k) container_of(k, struct dimm_info, dev)
 494
 495 /* show/store functions for DIMM Label attributes */
 496 static ssize_t dimmdev_location_show(struct device *dev,
 497                                      struct device_attribute *mattr, char *data)
 498 {
 499         struct dimm_info *dimm = to_dimm(dev);
 500
 501         return edac_dimm_info_location(dimm, data, PAGE_SIZE);
 502 }
 503
 504 static ssize_t dimmdev_label_show(struct device *dev,
 505                                   struct device_attribute *mattr, char *data)
 506 {
 507         struct dimm_info *dimm = to_dimm(dev);
 508
 509         /* if field has not been initialized, there is nothing to send */
 510         if (!dimm->label[0])
 511                 return 0;
 512
 513         return snprintf(data, sizeof(dimm->label) + 1, "%s\n", dimm->label);
 514 }
 515
 516 static ssize_t dimmdev_label_store(struct device *dev,
 517                                    struct device_attribute *mattr,
 518                                    const char *data,
 519                                    size_t count)
 520 {
 521         struct dimm_info *dimm = to_dimm(dev);
 522         size_t copy_count = count;
 523
 524         if (count == 0)
 525                 return -EINVAL;
 526
 527         if (data[count - 1] == '\0' || data[count - 1] == '\n')
 528                 copy_count -= 1;
 529
 530         if (copy_count == 0 || copy_count >= sizeof(dimm->label))
 531                 return -EINVAL;
 532
 533         strncpy(dimm->label, data, copy_count);
 534         dimm->label[copy_count] = '\0';
 535
 536         return count;
 537 }
 538
 539 static ssize_t dimmdev_size_show(struct device *dev,
 540                                  struct device_attribute *mattr, char *data)
 541 {
 542         struct dimm_info *dimm = to_dimm(dev);
 543
 544         return sprintf(data, "%u\n", PAGES_TO_MiB(dimm->nr_pages));
 545 }
 546
 547 static ssize_t dimmdev_mem_type_show(struct device *dev,
 548                                      struct device_attribute *mattr, char *data)
 549 {
 550         struct dimm_info *dimm = to_dimm(dev);
 551
 552         return sprintf(data, "%s\n", mem_types[dimm->mtype]);
 553 }
 554
 555 static ssize_t dimmdev_dev_type_show(struct device *dev,
 556                                      struct device_attribute *mattr, char *data)
 557 {
 558         struct dimm_info *dimm = to_dimm(dev);
 559
 560         return sprintf(data, "%s\n", dev_types[dimm->dtype]);
 561 }
 562
 563 static ssize_t dimmdev_edac_mode_show(struct device *dev,
 564                                       struct device_attribute *mattr,
 565                                       char *data)
 566 {
 567         struct dimm_info *dimm = to_dimm(dev);
 568
 569         return sprintf(data, "%s\n", edac_caps[dimm->edac_mode]);
 570 }
 571
 572 static ssize_t dimmdev_ce_count_show(struct device *dev,
 573                                       struct device_attribute *mattr,
 574                                       char *data)
 575 {
 576         struct dimm_info *dimm = to_dimm(dev);
 577         u32 count;
 578         int off;
 579
 580         off = EDAC_DIMM_OFF(dimm->mci->layers,
 581                             dimm->mci->n_layers,
 582                             dimm->location[0],
 583                             dimm->location[1],
 584                             dimm->location[2]);
 585         count = dimm->mci->ce_per_layer[dimm->mci->n_layers-1][off];
 586         return sprintf(data, "%u\n", count);
 587 }
 588
 589 static ssize_t dimmdev_ue_count_show(struct device *dev,
 590                                       struct device_attribute *mattr,
 591                                       char *data)
 592 {
 593         struct dimm_info *dimm = to_dimm(dev);
 594         u32 count;
 595         int off;
 596
 597         off = EDAC_DIMM_OFF(dimm->mci->layers,
 598                             dimm->mci->n_layers,
 599                             dimm->location[0],
 600                             dimm->location[1],
 601                             dimm->location[2]);
 602         count = dimm->mci->ue_per_layer[dimm->mci->n_layers-1][off];
 603         return sprintf(data, "%u\n", count);
 604 }
 605
 606 /* dimm/rank attribute files */
 607 static DEVICE_ATTR(dimm_label, S_IRUGO | S_IWUSR,
 608                    dimmdev_label_show, dimmdev_label_store);
 609 static DEVICE_ATTR(dimm_location, S_IRUGO, dimmdev_location_show, NULL);
 610 static DEVICE_ATTR(size, S_IRUGO, dimmdev_size_show, NULL);
 611 static DEVICE_ATTR(dimm_mem_type, S_IRUGO, dimmdev_mem_type_show, NULL);
 612 static DEVICE_ATTR(dimm_dev_type, S_IRUGO, dimmdev_dev_type_show, NULL);
 613 static DEVICE_ATTR(dimm_edac_mode, S_IRUGO, dimmdev_edac_mode_show, NULL);
 614 static DEVICE_ATTR(dimm_ce_count, S_IRUGO, dimmdev_ce_count_show, NULL);
 615 static DEVICE_ATTR(dimm_ue_count, S_IRUGO, dimmdev_ue_count_show, NULL);
 616
 617 /* attributes of the dimm<id>/rank<id> object */
 618 static struct attribute *dimm_attrs[] = {
 619         &dev_attr_dimm_label.attr,
 620         &dev_attr_dimm_location.attr,
 621         &dev_attr_size.attr,
 622         &dev_attr_dimm_mem_type.attr,
 623         &dev_attr_dimm_dev_type.attr,
 624         &dev_attr_dimm_edac_mode.attr,
 625         &dev_attr_dimm_ce_count.attr,
 626         &dev_attr_dimm_ue_count.attr,
 627         NULL,
 628 };
 629
 630 static const struct attribute_group dimm_attr_grp = {
 631         .attrs  = dimm_attrs,
 632 };
 633
 634 static const struct attribute_group *dimm_attr_groups[] = {
 635         &dimm_attr_grp,
 636         NULL
 637 };
 638
 639 static void dimm_attr_release(struct device *dev)
 640 {
 641         struct dimm_info *dimm = container_of(dev, struct dimm_info, dev);
 642
 643         edac_dbg(1, "Releasing dimm device %s\n", dev_name(dev));
 644         kfree(dimm);
 645 }
 646
 647 static const struct device_type dimm_attr_type = {
 648         .groups         = dimm_attr_groups,
 649         .release        = dimm_attr_release,
 650 };
 651
 652 /* Create a DIMM object under specifed memory controller device */
 653 static int edac_create_dimm_object(struct mem_ctl_info *mci,
 654                                    struct dimm_info *dimm,
 655                                    int index)
 656 {
 657         int err;
 658         dimm->mci = mci;
 659
 660         dimm->dev.type = &dimm_attr_type;
 661         dimm->dev.bus = mci->bus;
 662         device_initialize(&dimm->dev);
 663
 664         dimm->dev.parent = &mci->dev;
 665         if (mci->csbased)
 666                 dev_set_name(&dimm->dev, "rank%d", index);
 667         else
 668                 dev_set_name(&dimm->dev, "dimm%d", index);
 669         dev_set_drvdata(&dimm->dev, dimm);
 670         pm_runtime_forbid(&mci->dev);
 671
 672         err =  device_add(&dimm->dev);
 673
 674         edac_dbg(0, "creating rank/dimm device %s\n", dev_name(&dimm->dev));
 675
 676         return err;
 677 }
 678
 679 /*
 680  * Memory controller device
 681  */
 682
 683 #define to_mci(k) container_of(k, struct mem_ctl_info, dev)
 684
 685 static ssize_t mci_reset_counters_store(struct device *dev,
 686                                         struct device_attribute *mattr,
 687                                         const char *data, size_t count)
 688 {
 689         struct mem_ctl_info *mci = to_mci(dev);
 690         int cnt, row, chan, i;
 691         mci->ue_mc = 0;
 692         mci->ce_mc = 0;
 693         mci->ue_noinfo_count = 0;
 694         mci->ce_noinfo_count = 0;
 695
 696         for (row = 0; row < mci->nr_csrows; row++) {
 697                 struct csrow_info *ri = mci->csrows[row];
 698
 699                 ri->ue_count = 0;
 700                 ri->ce_count = 0;
 701
 702                 for (chan = 0; chan < ri->nr_channels; chan++)
 703                         ri->channels[chan]->ce_count = 0;
 704         }
 705
 706         cnt = 1;
 707         for (i = 0; i < mci->n_layers; i++) {
 708                 cnt *= mci->layers[i].size;
 709                 memset(mci->ce_per_layer[i], 0, cnt * sizeof(u32));
 710                 memset(mci->ue_per_layer[i], 0, cnt * sizeof(u32));
 711         }
 712
 713         mci->start_time = jiffies;
 714         return count;
 715 }
 716
 717 /* Memory scrubbing interface:
 718  *
 719  * A MC driver can limit the scrubbing bandwidth based on the CPU type.
 720  * Therefore, ->set_sdram_scrub_rate should be made to return the actual
 721  * bandwidth that is accepted or 0 when scrubbing is to be disabled.
 722  *
 723  * Negative value still means that an error has occurred while setting
 724  * the scrub rate.
 725  */
 726 static ssize_t mci_sdram_scrub_rate_store(struct device *dev,
 727                                           struct device_attribute *mattr,
 728                                           const char *data, size_t count)
 729 {
 730         struct mem_ctl_info *mci = to_mci(dev);
 731         unsigned long bandwidth = 0;
 732         int new_bw = 0;
 733
 734         if (kstrtoul(data, 10, &bandwidth) < 0)
 735                 return -EINVAL;
 736
 737         new_bw = mci->set_sdram_scrub_rate(mci, bandwidth);
 738         if (new_bw < 0) {
 739                 edac_printk(KERN_WARNING, EDAC_MC,
 740                             "Error setting scrub rate to: %lu\n", bandwidth);
 741                 return -EINVAL;
 742         }
 743
 744         return count;
 745 }
 746
 747 /*
 748  * ->get_sdram_scrub_rate() return value semantics same as above.
 749  */
 750 static ssize_t mci_sdram_scrub_rate_show(struct device *dev,
 751                                          struct device_attribute *mattr,
 752                                          char *data)
 753 {
 754         struct mem_ctl_info *mci = to_mci(dev);
 755         int bandwidth = 0;
 756
 757         bandwidth = mci->get_sdram_scrub_rate(mci);
 758         if (bandwidth < 0) {
 759                 edac_printk(KERN_DEBUG, EDAC_MC, "Error reading scrub rate\n");
 760                 return bandwidth;
 761         }
 762
 763         return sprintf(data, "%d\n", bandwidth);
 764 }
 765
 766 /* default attribute files for the MCI object */
 767 static ssize_t mci_ue_count_show(struct device *dev,
 768                                  struct device_attribute *mattr,
 769                                  char *data)
 770 {
 771         struct mem_ctl_info *mci = to_mci(dev);
 772
 773         return sprintf(data, "%d\n", mci->ue_mc);
 774 }
 775
 776 static ssize_t mci_ce_count_show(struct device *dev,
 777                                  struct device_attribute *mattr,
 778                                  char *data)
 779 {
 780         struct mem_ctl_info *mci = to_mci(dev);
 781
 782         return sprintf(data, "%d\n", mci->ce_mc);
 783 }
 784
 785 static ssize_t mci_ce_noinfo_show(struct device *dev,
 786                                   struct device_attribute *mattr,
 787                                   char *data)
 788 {
 789         struct mem_ctl_info *mci = to_mci(dev);
 790
 791         return sprintf(data, "%d\n", mci->ce_noinfo_count);
 792 }
 793
 794 static ssize_t mci_ue_noinfo_show(struct device *dev,
 795                                   struct device_attribute *mattr,
 796                                   char *data)
 797 {
 798         struct mem_ctl_info *mci = to_mci(dev);
 799
 800         return sprintf(data, "%d\n", mci->ue_noinfo_count);
 801 }
 802
 803 static ssize_t mci_seconds_show(struct device *dev,
 804                                 struct device_attribute *mattr,
 805                                 char *data)
 806 {
 807         struct mem_ctl_info *mci = to_mci(dev);
 808
 809         return sprintf(data, "%ld\n", (jiffies - mci->start_time) / HZ);
 810 }
 811
 812 static ssize_t mci_ctl_name_show(struct device *dev,
 813                                  struct device_attribute *mattr,
 814                                  char *data)
 815 {
 816         struct mem_ctl_info *mci = to_mci(dev);
 817
 818         return sprintf(data, "%s\n", mci->ctl_name);
 819 }
 820
 821 static ssize_t mci_size_mb_show(struct device *dev,
 822                                 struct device_attribute *mattr,
 823                                 char *data)
 824 {
 825         struct mem_ctl_info *mci = to_mci(dev);
 826         int total_pages = 0, csrow_idx, j;
 827
 828         for (csrow_idx = 0; csrow_idx < mci->nr_csrows; csrow_idx++) {
 829                 struct csrow_info *csrow = mci->csrows[csrow_idx];
 830
 831                 for (j = 0; j < csrow->nr_channels; j++) {
 832                         struct dimm_info *dimm = csrow->channels[j]->dimm;
 833
 834                         total_pages += dimm->nr_pages;
 835                 }
 836         }
 837
 838         return sprintf(data, "%u\n", PAGES_TO_MiB(total_pages));
 839 }
 840
 841 static ssize_t mci_max_location_show(struct device *dev,
 842                                      struct device_attribute *mattr,
 843                                      char *data)
 844 {
 845         struct mem_ctl_info *mci = to_mci(dev);
 846         int i;
 847         char *p = data;
 848
 849         for (i = 0; i < mci->n_layers; i++) {
 850                 p += sprintf(p, "%s %d ",
 851                              edac_layer_name[mci->layers[i].type],
 852                              mci->layers[i].size - 1);
 853         }
 854
 855         return p - data;
 856 }
 857
 858 /* default Control file */
 859 static DEVICE_ATTR(reset_counters, S_IWUSR, NULL, mci_reset_counters_store);
 860
 861 /* default Attribute files */
 862 static DEVICE_ATTR(mc_name, S_IRUGO, mci_ctl_name_show, NULL);
 863 static DEVICE_ATTR(size_mb, S_IRUGO, mci_size_mb_show, NULL);
 864 static DEVICE_ATTR(seconds_since_reset, S_IRUGO, mci_seconds_show, NULL);
 865 static DEVICE_ATTR(ue_noinfo_count, S_IRUGO, mci_ue_noinfo_show, NULL);
 866 static DEVICE_ATTR(ce_noinfo_count, S_IRUGO, mci_ce_noinfo_show, NULL);
 867 static DEVICE_ATTR(ue_count, S_IRUGO, mci_ue_count_show, NULL);
 868 static DEVICE_ATTR(ce_count, S_IRUGO, mci_ce_count_show, NULL);
 869 static DEVICE_ATTR(max_location, S_IRUGO, mci_max_location_show, NULL);
 870
 871 /* memory scrubber attribute file */
 872 static DEVICE_ATTR(sdram_scrub_rate, 0, mci_sdram_scrub_rate_show,
 873             mci_sdram_scrub_rate_store); /* umode set later in is_visible */
 874
 875 static struct attribute *mci_attrs[] = {
 876         &dev_attr_reset_counters.attr,
 877         &dev_attr_mc_name.attr,
 878         &dev_attr_size_mb.attr,
 879         &dev_attr_seconds_since_reset.attr,
 880         &dev_attr_ue_noinfo_count.attr,
 881         &dev_attr_ce_noinfo_count.attr,
 882         &dev_attr_ue_count.attr,
 883         &dev_attr_ce_count.attr,
 884         &dev_attr_max_location.attr,
 885         &dev_attr_sdram_scrub_rate.attr,
 886         NULL
 887 };
 888
 889 static umode_t mci_attr_is_visible(struct kobject *kobj,
 890                                    struct attribute *attr, int idx)
 891 {
 892         struct device *dev = kobj_to_dev(kobj);
 893         struct mem_ctl_info *mci = to_mci(dev);
 894         umode_t mode = 0;
 895
 896         if (attr != &dev_attr_sdram_scrub_rate.attr)
 897                 return attr->mode;
 898         if (mci->get_sdram_scrub_rate)
 899                 mode |= S_IRUGO;
 900         if (mci->set_sdram_scrub_rate)
 901                 mode |= S_IWUSR;
 902         return mode;
 903 }
 904
 905 static const struct attribute_group mci_attr_grp = {
 906         .attrs  = mci_attrs,
 907         .is_visible = mci_attr_is_visible,
 908 };
 909
 910 static const struct attribute_group *mci_attr_groups[] = {
 911         &mci_attr_grp,
 912         NULL
 913 };
 914
 915 static void mci_attr_release(struct device *dev)
 916 {
 917         struct mem_ctl_info *mci = container_of(dev, struct mem_ctl_info, dev);
 918
 919         edac_dbg(1, "Releasing csrow device %s\n", dev_name(dev));
 920         kfree(mci);
 921 }
 922
 923 static const struct device_type mci_attr_type = {
 924         .groups         = mci_attr_groups,
 925         .release        = mci_attr_release,
 926 };
 927
 928 /*
 929  * Create a new Memory Controller kobject instance,
 930  *      mc<id> under the 'mc' directory
 931  *
 932  * Return:
 933  *      0       Success
 934  *      !0      Failure
 935  */
 936 int edac_create_sysfs_mci_device(struct mem_ctl_info *mci,
 937                                  const struct attribute_group **groups)
 938 {
 939         char *name;
 940         int i, err;
 941
 942         /*
 943          * The memory controller needs its own bus, in order to avoid
 944          * namespace conflicts at /sys/bus/edac.
 945          */
 946         name = kasprintf(GFP_KERNEL, "mc%d", mci->mc_idx);
 947         if (!name)
 948                 return -ENOMEM;
 949
 950         mci->bus->name = name;
 951
 952         edac_dbg(0, "creating bus %s\n", mci->bus->name);
 953
 954         err = bus_register(mci->bus);
 955         if (err < 0) {
 956                 kfree(name);
 957                 return err;
 958         }
 959
 960         /* get the /sys/devices/system/edac subsys reference */
 961         mci->dev.type = &mci_attr_type;
 962         device_initialize(&mci->dev);
 963
 964         mci->dev.parent = mci_pdev;
 965         mci->dev.bus = mci->bus;
 966         mci->dev.groups = groups;
 967         dev_set_name(&mci->dev, "mc%d", mci->mc_idx);
 968         dev_set_drvdata(&mci->dev, mci);
 969         pm_runtime_forbid(&mci->dev);
 970
 971         edac_dbg(0, "creating device %s\n", dev_name(&mci->dev));
 972         err = device_add(&mci->dev);
 973         if (err < 0) {
 974                 edac_dbg(1, "failure: create device %s\n", dev_name(&mci->dev));
 975                 goto fail_unregister_bus;
 976         }
 977
 978         /*
 979          * Create the dimm/rank devices
 980          */
 981         for (i = 0; i < mci->tot_dimms; i++) {
 982                 struct dimm_info *dimm = mci->dimms[i];
 983                 /* Only expose populated DIMMs */
 984                 if (!dimm->nr_pages)
 985                         continue;
 986
 987 #ifdef CONFIG_EDAC_DEBUG
 988                 edac_dbg(1, "creating dimm%d, located at ", i);
 989                 if (edac_debug_level >= 1) {
 990                         int lay;
 991                         for (lay = 0; lay < mci->n_layers; lay++)
 992                                 printk(KERN_CONT "%s %d ",
 993                                         edac_layer_name[mci->layers[lay].type],
 994                                         dimm->location[lay]);
 995                         printk(KERN_CONT "\n");
 996                 }
 997 #endif
 998                 err = edac_create_dimm_object(mci, dimm, i);
 999                 if (err) {
1000                         edac_dbg(1, "failure: create dimm %d obj\n", i);
1001                         goto fail_unregister_dimm;
1002                 }
1003         }
1004
1005 #ifdef CONFIG_EDAC_LEGACY_SYSFS
1006         err = edac_create_csrow_objects(mci);
1007         if (err < 0)
1008                 goto fail_unregister_dimm;
1009 #endif
1010
1011         edac_create_debugfs_nodes(mci);
1012         return 0;
1013
1014 fail_unregister_dimm:
1015         for (i--; i >= 0; i--) {
1016                 struct dimm_info *dimm = mci->dimms[i];
1017                 if (!dimm->nr_pages)
1018                         continue;
1019
1020                 device_unregister(&dimm->dev);
1021         }
1022         device_unregister(&mci->dev);
1023 fail_unregister_bus:
1024         bus_unregister(mci->bus);
1025         kfree(name);
1026
1027         return err;
1028 }
1029
1030 /*
1031  * remove a Memory Controller instance
1032  */
1033 void edac_remove_sysfs_mci_device(struct mem_ctl_info *mci)
1034 {
1035         int i;
1036
1037         edac_dbg(0, "\n");
1038
1039 #ifdef CONFIG_EDAC_DEBUG
1040         edac_debugfs_remove_recursive(mci->debugfs);
1041 #endif
1042 #ifdef CONFIG_EDAC_LEGACY_SYSFS
1043         edac_delete_csrow_objects(mci);
1044 #endif
1045
1046         for (i = 0; i < mci->tot_dimms; i++) {
1047                 struct dimm_info *dimm = mci->dimms[i];
1048                 if (dimm->nr_pages == 0)
1049                         continue;
1050                 edac_dbg(0, "removing device %s\n", dev_name(&dimm->dev));
1051                 device_unregister(&dimm->dev);
1052         }
1053 }
1054
1055 void edac_unregister_sysfs(struct mem_ctl_info *mci)
1056 {
1057         struct bus_type *bus = mci->bus;
1058         const char *name = mci->bus->name;
1059
1060         edac_dbg(1, "Unregistering device %s\n", dev_name(&mci->dev));
1061         device_unregister(&mci->dev);
1062         bus_unregister(bus);
1063         kfree(name);
1064 }
1065
1066 static void mc_attr_release(struct device *dev)
1067 {
1068         /*
1069          * There's no container structure here, as this is just the mci
1070          * parent device, used to create the /sys/devices/mc sysfs node.
1071          * So, there are no attributes on it.
1072          */
1073         edac_dbg(1, "Releasing device %s\n", dev_name(dev));
1074         kfree(dev);
1075 }
1076
1077 static const struct device_type mc_attr_type = {
1078         .release        = mc_attr_release,
1079 };
1080 /*
1081  * Init/exit code for the module. Basically, creates/removes /sys/class/rc
1082  */
1083 int __init edac_mc_sysfs_init(void)
1084 {
1085         int err;
1086
1087         mci_pdev = kzalloc(sizeof(*mci_pdev), GFP_KERNEL);
1088         if (!mci_pdev) {
1089                 err = -ENOMEM;
1090                 goto out;
1091         }
1092
1093         mci_pdev->bus = edac_get_sysfs_subsys();
1094         mci_pdev->type = &mc_attr_type;
1095         device_initialize(mci_pdev);
1096         dev_set_name(mci_pdev, "mc");
1097
1098         err = device_add(mci_pdev);
1099         if (err < 0)
1100                 goto out_dev_free;
1101
1102         edac_dbg(0, "device %s created\n", dev_name(mci_pdev));
1103
1104         return 0;
1105
1106  out_dev_free:
1107         kfree(mci_pdev);
1108  out:
1109         return err;
1110 }
1111
1112 void edac_mc_sysfs_exit(void)
1113 {
1114         device_unregister(mci_pdev);
1115 }