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 unsigned 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 unsigned 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, const struct kernel_param *kp)
  54 {
  55         unsigned int i;
  56         int ret;
  57
  58         if (!val)
  59                 return -EINVAL;
  60
  61         ret = kstrtouint(val, 0, &i);
  62         if (ret)
  63                 return ret;
  64
  65         if (i < 1000)
  66                 return -EINVAL;
  67
  68         *((unsigned int *)kp->arg) = i;
  69
  70         /* notify edac_mc engine to reset the poll period */
  71         edac_mc_reset_delay_period(i);
  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_uint,
  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 dev_types[] = {
  95         [DEV_UNKNOWN] = "Unknown",
  96         [DEV_X1] = "x1",
  97         [DEV_X2] = "x2",
  98         [DEV_X4] = "x4",
  99         [DEV_X8] = "x8",
 100         [DEV_X16] = "x16",
 101         [DEV_X32] = "x32",
 102         [DEV_X64] = "x64"
 103 };
 104
 105 static const char * const edac_caps[] = {
 106         [EDAC_UNKNOWN] = "Unknown",
 107         [EDAC_NONE] = "None",
 108         [EDAC_RESERVED] = "Reserved",
 109         [EDAC_PARITY] = "PARITY",
 110         [EDAC_EC] = "EC",
 111         [EDAC_SECDED] = "SECDED",
 112         [EDAC_S2ECD2ED] = "S2ECD2ED",
 113         [EDAC_S4ECD4ED] = "S4ECD4ED",
 114         [EDAC_S8ECD8ED] = "S8ECD8ED",
 115         [EDAC_S16ECD16ED] = "S16ECD16ED"
 116 };
 117
 118 #ifdef CONFIG_EDAC_LEGACY_SYSFS
 119 /*
 120  * EDAC sysfs CSROW data structures and methods
 121  */
 122
 123 #define to_csrow(k) container_of(k, struct csrow_info, dev)
 124
 125 /*
 126  * We need it to avoid namespace conflicts between the legacy API
 127  * and the per-dimm/per-rank one
 128  */
 129 #define DEVICE_ATTR_LEGACY(_name, _mode, _show, _store) \
 130         static struct device_attribute dev_attr_legacy_##_name = __ATTR(_name, _mode, _show, _store)
 131
 132 struct dev_ch_attribute {
 133         struct device_attribute attr;
 134         int channel;
 135 };
 136
 137 #define DEVICE_CHANNEL(_name, _mode, _show, _store, _var) \
 138         static struct dev_ch_attribute dev_attr_legacy_##_name = \
 139                 { __ATTR(_name, _mode, _show, _store), (_var) }
 140
 141 #define to_channel(k) (container_of(k, struct dev_ch_attribute, attr)->channel)
 142
 143 /* Set of more default csrow<id> attribute show/store functions */
 144 static ssize_t csrow_ue_count_show(struct device *dev,
 145                                    struct device_attribute *mattr, char *data)
 146 {
 147         struct csrow_info *csrow = to_csrow(dev);
 148
 149         return sprintf(data, "%u\n", csrow->ue_count);
 150 }
 151
 152 static ssize_t csrow_ce_count_show(struct device *dev,
 153                                    struct device_attribute *mattr, char *data)
 154 {
 155         struct csrow_info *csrow = to_csrow(dev);
 156
 157         return sprintf(data, "%u\n", csrow->ce_count);
 158 }
 159
 160 static ssize_t csrow_size_show(struct device *dev,
 161                                struct device_attribute *mattr, char *data)
 162 {
 163         struct csrow_info *csrow = to_csrow(dev);
 164         int i;
 165         u32 nr_pages = 0;
 166
 167         for (i = 0; i < csrow->nr_channels; i++)
 168                 nr_pages += csrow->channels[i]->dimm->nr_pages;
 169         return sprintf(data, "%u\n", PAGES_TO_MiB(nr_pages));
 170 }
 171
 172 static ssize_t csrow_mem_type_show(struct device *dev,
 173                                    struct device_attribute *mattr, char *data)
 174 {
 175         struct csrow_info *csrow = to_csrow(dev);
 176
 177         return sprintf(data, "%s\n", edac_mem_types[csrow->channels[0]->dimm->mtype]);
 178 }
 179
 180 static ssize_t csrow_dev_type_show(struct device *dev,
 181                                    struct device_attribute *mattr, char *data)
 182 {
 183         struct csrow_info *csrow = to_csrow(dev);
 184
 185         return sprintf(data, "%s\n", dev_types[csrow->channels[0]->dimm->dtype]);
 186 }
 187
 188 static ssize_t csrow_edac_mode_show(struct device *dev,
 189                                     struct device_attribute *mattr,
 190                                     char *data)
 191 {
 192         struct csrow_info *csrow = to_csrow(dev);
 193
 194         return sprintf(data, "%s\n", edac_caps[csrow->channels[0]->dimm->edac_mode]);
 195 }
 196
 197 /* show/store functions for DIMM Label attributes */
 198 static ssize_t channel_dimm_label_show(struct device *dev,
 199                                        struct device_attribute *mattr,
 200                                        char *data)
 201 {
 202         struct csrow_info *csrow = to_csrow(dev);
 203         unsigned chan = to_channel(mattr);
 204         struct rank_info *rank = csrow->channels[chan];
 205
 206         /* if field has not been initialized, there is nothing to send */
 207         if (!rank->dimm->label[0])
 208                 return 0;
 209
 210         return snprintf(data, sizeof(rank->dimm->label) + 1, "%s\n",
 211                         rank->dimm->label);
 212 }
 213
 214 static ssize_t channel_dimm_label_store(struct device *dev,
 215                                         struct device_attribute *mattr,
 216                                         const char *data, size_t count)
 217 {
 218         struct csrow_info *csrow = to_csrow(dev);
 219         unsigned chan = to_channel(mattr);
 220         struct rank_info *rank = csrow->channels[chan];
 221         size_t copy_count = count;
 222
 223         if (count == 0)
 224                 return -EINVAL;
 225
 226         if (data[count - 1] == '\0' || data[count - 1] == '\n')
 227                 copy_count -= 1;
 228
 229         if (copy_count == 0 || copy_count >= sizeof(rank->dimm->label))
 230                 return -EINVAL;
 231
 232         strncpy(rank->dimm->label, data, copy_count);
 233         rank->dimm->label[copy_count] = '\0';
 234
 235         return count;
 236 }
 237
 238 /* show function for dynamic chX_ce_count attribute */
 239 static ssize_t channel_ce_count_show(struct device *dev,
 240                                      struct device_attribute *mattr, char *data)
 241 {
 242         struct csrow_info *csrow = to_csrow(dev);
 243         unsigned chan = to_channel(mattr);
 244         struct rank_info *rank = csrow->channels[chan];
 245
 246         return sprintf(data, "%u\n", rank->ce_count);
 247 }
 248
 249 /* cwrow<id>/attribute files */
 250 DEVICE_ATTR_LEGACY(size_mb, S_IRUGO, csrow_size_show, NULL);
 251 DEVICE_ATTR_LEGACY(dev_type, S_IRUGO, csrow_dev_type_show, NULL);
 252 DEVICE_ATTR_LEGACY(mem_type, S_IRUGO, csrow_mem_type_show, NULL);
 253 DEVICE_ATTR_LEGACY(edac_mode, S_IRUGO, csrow_edac_mode_show, NULL);
 254 DEVICE_ATTR_LEGACY(ue_count, S_IRUGO, csrow_ue_count_show, NULL);
 255 DEVICE_ATTR_LEGACY(ce_count, S_IRUGO, csrow_ce_count_show, NULL);
 256
 257 /* default attributes of the CSROW<id> object */
 258 static struct attribute *csrow_attrs[] = {
 259         &dev_attr_legacy_dev_type.attr,
 260         &dev_attr_legacy_mem_type.attr,
 261         &dev_attr_legacy_edac_mode.attr,
 262         &dev_attr_legacy_size_mb.attr,
 263         &dev_attr_legacy_ue_count.attr,
 264         &dev_attr_legacy_ce_count.attr,
 265         NULL,
 266 };
 267
 268 static const struct attribute_group csrow_attr_grp = {
 269         .attrs  = csrow_attrs,
 270 };
 271
 272 static const struct attribute_group *csrow_attr_groups[] = {
 273         &csrow_attr_grp,
 274         NULL
 275 };
 276
 277 static void csrow_attr_release(struct device *dev)
 278 {
 279         struct csrow_info *csrow = container_of(dev, struct csrow_info, dev);
 280
 281         edac_dbg(1, "Releasing csrow device %s\n", dev_name(dev));
 282         kfree(csrow);
 283 }
 284
 285 static const struct device_type csrow_attr_type = {
 286         .groups         = csrow_attr_groups,
 287         .release        = csrow_attr_release,
 288 };
 289
 290 /*
 291  * possible dynamic channel DIMM Label attribute files
 292  *
 293  */
 294 DEVICE_CHANNEL(ch0_dimm_label, S_IRUGO | S_IWUSR,
 295         channel_dimm_label_show, channel_dimm_label_store, 0);
 296 DEVICE_CHANNEL(ch1_dimm_label, S_IRUGO | S_IWUSR,
 297         channel_dimm_label_show, channel_dimm_label_store, 1);
 298 DEVICE_CHANNEL(ch2_dimm_label, S_IRUGO | S_IWUSR,
 299         channel_dimm_label_show, channel_dimm_label_store, 2);
 300 DEVICE_CHANNEL(ch3_dimm_label, S_IRUGO | S_IWUSR,
 301         channel_dimm_label_show, channel_dimm_label_store, 3);
 302 DEVICE_CHANNEL(ch4_dimm_label, S_IRUGO | S_IWUSR,
 303         channel_dimm_label_show, channel_dimm_label_store, 4);
 304 DEVICE_CHANNEL(ch5_dimm_label, S_IRUGO | S_IWUSR,
 305         channel_dimm_label_show, channel_dimm_label_store, 5);
 306 DEVICE_CHANNEL(ch6_dimm_label, S_IRUGO | S_IWUSR,
 307         channel_dimm_label_show, channel_dimm_label_store, 6);
 308 DEVICE_CHANNEL(ch7_dimm_label, S_IRUGO | S_IWUSR,
 309         channel_dimm_label_show, channel_dimm_label_store, 7);
 310
 311 /* Total possible dynamic DIMM Label attribute file table */
 312 static struct attribute *dynamic_csrow_dimm_attr[] = {
 313         &dev_attr_legacy_ch0_dimm_label.attr.attr,
 314         &dev_attr_legacy_ch1_dimm_label.attr.attr,
 315         &dev_attr_legacy_ch2_dimm_label.attr.attr,
 316         &dev_attr_legacy_ch3_dimm_label.attr.attr,
 317         &dev_attr_legacy_ch4_dimm_label.attr.attr,
 318         &dev_attr_legacy_ch5_dimm_label.attr.attr,
 319         &dev_attr_legacy_ch6_dimm_label.attr.attr,
 320         &dev_attr_legacy_ch7_dimm_label.attr.attr,
 321         NULL
 322 };
 323
 324 /* possible dynamic channel ce_count attribute files */
 325 DEVICE_CHANNEL(ch0_ce_count, S_IRUGO,
 326                    channel_ce_count_show, NULL, 0);
 327 DEVICE_CHANNEL(ch1_ce_count, S_IRUGO,
 328                    channel_ce_count_show, NULL, 1);
 329 DEVICE_CHANNEL(ch2_ce_count, S_IRUGO,
 330                    channel_ce_count_show, NULL, 2);
 331 DEVICE_CHANNEL(ch3_ce_count, S_IRUGO,
 332                    channel_ce_count_show, NULL, 3);
 333 DEVICE_CHANNEL(ch4_ce_count, S_IRUGO,
 334                    channel_ce_count_show, NULL, 4);
 335 DEVICE_CHANNEL(ch5_ce_count, S_IRUGO,
 336                    channel_ce_count_show, NULL, 5);
 337 DEVICE_CHANNEL(ch6_ce_count, S_IRUGO,
 338                    channel_ce_count_show, NULL, 6);
 339 DEVICE_CHANNEL(ch7_ce_count, S_IRUGO,
 340                    channel_ce_count_show, NULL, 7);
 341
 342 /* Total possible dynamic ce_count attribute file table */
 343 static struct attribute *dynamic_csrow_ce_count_attr[] = {
 344         &dev_attr_legacy_ch0_ce_count.attr.attr,
 345         &dev_attr_legacy_ch1_ce_count.attr.attr,
 346         &dev_attr_legacy_ch2_ce_count.attr.attr,
 347         &dev_attr_legacy_ch3_ce_count.attr.attr,
 348         &dev_attr_legacy_ch4_ce_count.attr.attr,
 349         &dev_attr_legacy_ch5_ce_count.attr.attr,
 350         &dev_attr_legacy_ch6_ce_count.attr.attr,
 351         &dev_attr_legacy_ch7_ce_count.attr.attr,
 352         NULL
 353 };
 354
 355 static umode_t csrow_dev_is_visible(struct kobject *kobj,
 356                                     struct attribute *attr, int idx)
 357 {
 358         struct device *dev = kobj_to_dev(kobj);
 359         struct csrow_info *csrow = container_of(dev, struct csrow_info, dev);
 360
 361         if (idx >= csrow->nr_channels)
 362                 return 0;
 363
 364         if (idx >= ARRAY_SIZE(dynamic_csrow_ce_count_attr) - 1) {
 365                 WARN_ONCE(1, "idx: %d\n", idx);
 366                 return 0;
 367         }
 368
 369         /* Only expose populated DIMMs */
 370         if (!csrow->channels[idx]->dimm->nr_pages)
 371                 return 0;
 372
 373         return attr->mode;
 374 }
 375
 376
 377 static const struct attribute_group csrow_dev_dimm_group = {
 378         .attrs = dynamic_csrow_dimm_attr,
 379         .is_visible = csrow_dev_is_visible,
 380 };
 381
 382 static const struct attribute_group csrow_dev_ce_count_group = {
 383         .attrs = dynamic_csrow_ce_count_attr,
 384         .is_visible = csrow_dev_is_visible,
 385 };
 386
 387 static const struct attribute_group *csrow_dev_groups[] = {
 388         &csrow_dev_dimm_group,
 389         &csrow_dev_ce_count_group,
 390         NULL
 391 };
 392
 393 static inline int nr_pages_per_csrow(struct csrow_info *csrow)
 394 {
 395         int chan, nr_pages = 0;
 396
 397         for (chan = 0; chan < csrow->nr_channels; chan++)
 398                 nr_pages += csrow->channels[chan]->dimm->nr_pages;
 399
 400         return nr_pages;
 401 }
 402
 403 /* Create a CSROW object under specifed edac_mc_device */
 404 static int edac_create_csrow_object(struct mem_ctl_info *mci,
 405                                     struct csrow_info *csrow, int index)
 406 {
 407         int err;
 408
 409         csrow->dev.type = &csrow_attr_type;
 410         csrow->dev.bus = mci->bus;
 411         csrow->dev.groups = csrow_dev_groups;
 412         device_initialize(&csrow->dev);
 413         csrow->dev.parent = &mci->dev;
 414         csrow->mci = mci;
 415         dev_set_name(&csrow->dev, "csrow%d", index);
 416         dev_set_drvdata(&csrow->dev, csrow);
 417
 418         edac_dbg(0, "creating (virtual) csrow node %s\n",
 419                  dev_name(&csrow->dev));
 420
 421         err = device_add(&csrow->dev);
 422         if (err)
 423                 put_device(&csrow->dev);
 424
 425         return err;
 426 }
 427
 428 /* Create a CSROW object under specifed edac_mc_device */
 429 static int edac_create_csrow_objects(struct mem_ctl_info *mci)
 430 {
 431         int err, i;
 432         struct csrow_info *csrow;
 433
 434         for (i = 0; i < mci->nr_csrows; i++) {
 435                 csrow = mci->csrows[i];
 436                 if (!nr_pages_per_csrow(csrow))
 437                         continue;
 438                 err = edac_create_csrow_object(mci, mci->csrows[i], i);
 439                 if (err < 0) {
 440                         edac_dbg(1,
 441                                  "failure: create csrow objects for csrow %d\n",
 442                                  i);
 443                         goto error;
 444                 }
 445         }
 446         return 0;
 447
 448 error:
 449         for (--i; i >= 0; i--) {
 450                 csrow = mci->csrows[i];
 451                 if (!nr_pages_per_csrow(csrow))
 452                         continue;
 453                 put_device(&mci->csrows[i]->dev);
 454         }
 455
 456         return err;
 457 }
 458
 459 static void edac_delete_csrow_objects(struct mem_ctl_info *mci)
 460 {
 461         int i;
 462         struct csrow_info *csrow;
 463
 464         for (i = mci->nr_csrows - 1; i >= 0; i--) {
 465                 csrow = mci->csrows[i];
 466                 if (!nr_pages_per_csrow(csrow))
 467                         continue;
 468                 device_unregister(&mci->csrows[i]->dev);
 469         }
 470 }
 471 #endif
 472
 473 /*
 474  * Per-dimm (or per-rank) devices
 475  */
 476
 477 #define to_dimm(k) container_of(k, struct dimm_info, dev)
 478
 479 /* show/store functions for DIMM Label attributes */
 480 static ssize_t dimmdev_location_show(struct device *dev,
 481                                      struct device_attribute *mattr, char *data)
 482 {
 483         struct dimm_info *dimm = to_dimm(dev);
 484
 485         return edac_dimm_info_location(dimm, data, PAGE_SIZE);
 486 }
 487
 488 static ssize_t dimmdev_label_show(struct device *dev,
 489                                   struct device_attribute *mattr, char *data)
 490 {
 491         struct dimm_info *dimm = to_dimm(dev);
 492
 493         /* if field has not been initialized, there is nothing to send */
 494         if (!dimm->label[0])
 495                 return 0;
 496
 497         return snprintf(data, sizeof(dimm->label) + 1, "%s\n", dimm->label);
 498 }
 499
 500 static ssize_t dimmdev_label_store(struct device *dev,
 501                                    struct device_attribute *mattr,
 502                                    const char *data,
 503                                    size_t count)
 504 {
 505         struct dimm_info *dimm = to_dimm(dev);
 506         size_t copy_count = count;
 507
 508         if (count == 0)
 509                 return -EINVAL;
 510
 511         if (data[count - 1] == '\0' || data[count - 1] == '\n')
 512                 copy_count -= 1;
 513
 514         if (copy_count == 0 || copy_count >= sizeof(dimm->label))
 515                 return -EINVAL;
 516
 517         strncpy(dimm->label, data, copy_count);
 518         dimm->label[copy_count] = '\0';
 519
 520         return count;
 521 }
 522
 523 static ssize_t dimmdev_size_show(struct device *dev,
 524                                  struct device_attribute *mattr, char *data)
 525 {
 526         struct dimm_info *dimm = to_dimm(dev);
 527
 528         return sprintf(data, "%u\n", PAGES_TO_MiB(dimm->nr_pages));
 529 }
 530
 531 static ssize_t dimmdev_mem_type_show(struct device *dev,
 532                                      struct device_attribute *mattr, char *data)
 533 {
 534         struct dimm_info *dimm = to_dimm(dev);
 535
 536         return sprintf(data, "%s\n", edac_mem_types[dimm->mtype]);
 537 }
 538
 539 static ssize_t dimmdev_dev_type_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, "%s\n", dev_types[dimm->dtype]);
 545 }
 546
 547 static ssize_t dimmdev_edac_mode_show(struct device *dev,
 548                                       struct device_attribute *mattr,
 549                                       char *data)
 550 {
 551         struct dimm_info *dimm = to_dimm(dev);
 552
 553         return sprintf(data, "%s\n", edac_caps[dimm->edac_mode]);
 554 }
 555
 556 static ssize_t dimmdev_ce_count_show(struct device *dev,
 557                                       struct device_attribute *mattr,
 558                                       char *data)
 559 {
 560         struct dimm_info *dimm = to_dimm(dev);
 561         u32 count;
 562         int off;
 563
 564         off = EDAC_DIMM_OFF(dimm->mci->layers,
 565                             dimm->mci->n_layers,
 566                             dimm->location[0],
 567                             dimm->location[1],
 568                             dimm->location[2]);
 569         count = dimm->mci->ce_per_layer[dimm->mci->n_layers-1][off];
 570         return sprintf(data, "%u\n", count);
 571 }
 572
 573 static ssize_t dimmdev_ue_count_show(struct device *dev,
 574                                       struct device_attribute *mattr,
 575                                       char *data)
 576 {
 577         struct dimm_info *dimm = to_dimm(dev);
 578         u32 count;
 579         int off;
 580
 581         off = EDAC_DIMM_OFF(dimm->mci->layers,
 582                             dimm->mci->n_layers,
 583                             dimm->location[0],
 584                             dimm->location[1],
 585                             dimm->location[2]);
 586         count = dimm->mci->ue_per_layer[dimm->mci->n_layers-1][off];
 587         return sprintf(data, "%u\n", count);
 588 }
 589
 590 /* dimm/rank attribute files */
 591 static DEVICE_ATTR(dimm_label, S_IRUGO | S_IWUSR,
 592                    dimmdev_label_show, dimmdev_label_store);
 593 static DEVICE_ATTR(dimm_location, S_IRUGO, dimmdev_location_show, NULL);
 594 static DEVICE_ATTR(size, S_IRUGO, dimmdev_size_show, NULL);
 595 static DEVICE_ATTR(dimm_mem_type, S_IRUGO, dimmdev_mem_type_show, NULL);
 596 static DEVICE_ATTR(dimm_dev_type, S_IRUGO, dimmdev_dev_type_show, NULL);
 597 static DEVICE_ATTR(dimm_edac_mode, S_IRUGO, dimmdev_edac_mode_show, NULL);
 598 static DEVICE_ATTR(dimm_ce_count, S_IRUGO, dimmdev_ce_count_show, NULL);
 599 static DEVICE_ATTR(dimm_ue_count, S_IRUGO, dimmdev_ue_count_show, NULL);
 600
 601 /* attributes of the dimm<id>/rank<id> object */
 602 static struct attribute *dimm_attrs[] = {
 603         &dev_attr_dimm_label.attr,
 604         &dev_attr_dimm_location.attr,
 605         &dev_attr_size.attr,
 606         &dev_attr_dimm_mem_type.attr,
 607         &dev_attr_dimm_dev_type.attr,
 608         &dev_attr_dimm_edac_mode.attr,
 609         &dev_attr_dimm_ce_count.attr,
 610         &dev_attr_dimm_ue_count.attr,
 611         NULL,
 612 };
 613
 614 static const struct attribute_group dimm_attr_grp = {
 615         .attrs  = dimm_attrs,
 616 };
 617
 618 static const struct attribute_group *dimm_attr_groups[] = {
 619         &dimm_attr_grp,
 620         NULL
 621 };
 622
 623 static void dimm_attr_release(struct device *dev)
 624 {
 625         struct dimm_info *dimm = container_of(dev, struct dimm_info, dev);
 626
 627         edac_dbg(1, "Releasing dimm device %s\n", dev_name(dev));
 628         kfree(dimm);
 629 }
 630
 631 static const struct device_type dimm_attr_type = {
 632         .groups         = dimm_attr_groups,
 633         .release        = dimm_attr_release,
 634 };
 635
 636 /* Create a DIMM object under specifed memory controller device */
 637 static int edac_create_dimm_object(struct mem_ctl_info *mci,
 638                                    struct dimm_info *dimm,
 639                                    int index)
 640 {
 641         int err;
 642         dimm->mci = mci;
 643
 644         dimm->dev.type = &dimm_attr_type;
 645         dimm->dev.bus = mci->bus;
 646         device_initialize(&dimm->dev);
 647
 648         dimm->dev.parent = &mci->dev;
 649         if (mci->csbased)
 650                 dev_set_name(&dimm->dev, "rank%d", index);
 651         else
 652                 dev_set_name(&dimm->dev, "dimm%d", index);
 653         dev_set_drvdata(&dimm->dev, dimm);
 654         pm_runtime_forbid(&mci->dev);
 655
 656         err =  device_add(&dimm->dev);
 657
 658         edac_dbg(0, "creating rank/dimm device %s\n", dev_name(&dimm->dev));
 659
 660         return err;
 661 }
 662
 663 /*
 664  * Memory controller device
 665  */
 666
 667 #define to_mci(k) container_of(k, struct mem_ctl_info, dev)
 668
 669 static ssize_t mci_reset_counters_store(struct device *dev,
 670                                         struct device_attribute *mattr,
 671                                         const char *data, size_t count)
 672 {
 673         struct mem_ctl_info *mci = to_mci(dev);
 674         int cnt, row, chan, i;
 675         mci->ue_mc = 0;
 676         mci->ce_mc = 0;
 677         mci->ue_noinfo_count = 0;
 678         mci->ce_noinfo_count = 0;
 679
 680         for (row = 0; row < mci->nr_csrows; row++) {
 681                 struct csrow_info *ri = mci->csrows[row];
 682
 683                 ri->ue_count = 0;
 684                 ri->ce_count = 0;
 685
 686                 for (chan = 0; chan < ri->nr_channels; chan++)
 687                         ri->channels[chan]->ce_count = 0;
 688         }
 689
 690         cnt = 1;
 691         for (i = 0; i < mci->n_layers; i++) {
 692                 cnt *= mci->layers[i].size;
 693                 memset(mci->ce_per_layer[i], 0, cnt * sizeof(u32));
 694                 memset(mci->ue_per_layer[i], 0, cnt * sizeof(u32));
 695         }
 696
 697         mci->start_time = jiffies;
 698         return count;
 699 }
 700
 701 /* Memory scrubbing interface:
 702  *
 703  * A MC driver can limit the scrubbing bandwidth based on the CPU type.
 704  * Therefore, ->set_sdram_scrub_rate should be made to return the actual
 705  * bandwidth that is accepted or 0 when scrubbing is to be disabled.
 706  *
 707  * Negative value still means that an error has occurred while setting
 708  * the scrub rate.
 709  */
 710 static ssize_t mci_sdram_scrub_rate_store(struct device *dev,
 711                                           struct device_attribute *mattr,
 712                                           const char *data, size_t count)
 713 {
 714         struct mem_ctl_info *mci = to_mci(dev);
 715         unsigned long bandwidth = 0;
 716         int new_bw = 0;
 717
 718         if (kstrtoul(data, 10, &bandwidth) < 0)
 719                 return -EINVAL;
 720
 721         new_bw = mci->set_sdram_scrub_rate(mci, bandwidth);
 722         if (new_bw < 0) {
 723                 edac_printk(KERN_WARNING, EDAC_MC,
 724                             "Error setting scrub rate to: %lu\n", bandwidth);
 725                 return -EINVAL;
 726         }
 727
 728         return count;
 729 }
 730
 731 /*
 732  * ->get_sdram_scrub_rate() return value semantics same as above.
 733  */
 734 static ssize_t mci_sdram_scrub_rate_show(struct device *dev,
 735                                          struct device_attribute *mattr,
 736                                          char *data)
 737 {
 738         struct mem_ctl_info *mci = to_mci(dev);
 739         int bandwidth = 0;
 740
 741         bandwidth = mci->get_sdram_scrub_rate(mci);
 742         if (bandwidth < 0) {
 743                 edac_printk(KERN_DEBUG, EDAC_MC, "Error reading scrub rate\n");
 744                 return bandwidth;
 745         }
 746
 747         return sprintf(data, "%d\n", bandwidth);
 748 }
 749
 750 /* default attribute files for the MCI object */
 751 static ssize_t mci_ue_count_show(struct device *dev,
 752                                  struct device_attribute *mattr,
 753                                  char *data)
 754 {
 755         struct mem_ctl_info *mci = to_mci(dev);
 756
 757         return sprintf(data, "%d\n", mci->ue_mc);
 758 }
 759
 760 static ssize_t mci_ce_count_show(struct device *dev,
 761                                  struct device_attribute *mattr,
 762                                  char *data)
 763 {
 764         struct mem_ctl_info *mci = to_mci(dev);
 765
 766         return sprintf(data, "%d\n", mci->ce_mc);
 767 }
 768
 769 static ssize_t mci_ce_noinfo_show(struct device *dev,
 770                                   struct device_attribute *mattr,
 771                                   char *data)
 772 {
 773         struct mem_ctl_info *mci = to_mci(dev);
 774
 775         return sprintf(data, "%d\n", mci->ce_noinfo_count);
 776 }
 777
 778 static ssize_t mci_ue_noinfo_show(struct device *dev,
 779                                   struct device_attribute *mattr,
 780                                   char *data)
 781 {
 782         struct mem_ctl_info *mci = to_mci(dev);
 783
 784         return sprintf(data, "%d\n", mci->ue_noinfo_count);
 785 }
 786
 787 static ssize_t mci_seconds_show(struct device *dev,
 788                                 struct device_attribute *mattr,
 789                                 char *data)
 790 {
 791         struct mem_ctl_info *mci = to_mci(dev);
 792
 793         return sprintf(data, "%ld\n", (jiffies - mci->start_time) / HZ);
 794 }
 795
 796 static ssize_t mci_ctl_name_show(struct device *dev,
 797                                  struct device_attribute *mattr,
 798                                  char *data)
 799 {
 800         struct mem_ctl_info *mci = to_mci(dev);
 801
 802         return sprintf(data, "%s\n", mci->ctl_name);
 803 }
 804
 805 static ssize_t mci_size_mb_show(struct device *dev,
 806                                 struct device_attribute *mattr,
 807                                 char *data)
 808 {
 809         struct mem_ctl_info *mci = to_mci(dev);
 810         int total_pages = 0, csrow_idx, j;
 811
 812         for (csrow_idx = 0; csrow_idx < mci->nr_csrows; csrow_idx++) {
 813                 struct csrow_info *csrow = mci->csrows[csrow_idx];
 814
 815                 for (j = 0; j < csrow->nr_channels; j++) {
 816                         struct dimm_info *dimm = csrow->channels[j]->dimm;
 817
 818                         total_pages += dimm->nr_pages;
 819                 }
 820         }
 821
 822         return sprintf(data, "%u\n", PAGES_TO_MiB(total_pages));
 823 }
 824
 825 static ssize_t mci_max_location_show(struct device *dev,
 826                                      struct device_attribute *mattr,
 827                                      char *data)
 828 {
 829         struct mem_ctl_info *mci = to_mci(dev);
 830         int i;
 831         char *p = data;
 832
 833         for (i = 0; i < mci->n_layers; i++) {
 834                 p += sprintf(p, "%s %d ",
 835                              edac_layer_name[mci->layers[i].type],
 836                              mci->layers[i].size - 1);
 837         }
 838
 839         return p - data;
 840 }
 841
 842 /* default Control file */
 843 static DEVICE_ATTR(reset_counters, S_IWUSR, NULL, mci_reset_counters_store);
 844
 845 /* default Attribute files */
 846 static DEVICE_ATTR(mc_name, S_IRUGO, mci_ctl_name_show, NULL);
 847 static DEVICE_ATTR(size_mb, S_IRUGO, mci_size_mb_show, NULL);
 848 static DEVICE_ATTR(seconds_since_reset, S_IRUGO, mci_seconds_show, NULL);
 849 static DEVICE_ATTR(ue_noinfo_count, S_IRUGO, mci_ue_noinfo_show, NULL);
 850 static DEVICE_ATTR(ce_noinfo_count, S_IRUGO, mci_ce_noinfo_show, NULL);
 851 static DEVICE_ATTR(ue_count, S_IRUGO, mci_ue_count_show, NULL);
 852 static DEVICE_ATTR(ce_count, S_IRUGO, mci_ce_count_show, NULL);
 853 static DEVICE_ATTR(max_location, S_IRUGO, mci_max_location_show, NULL);
 854
 855 /* memory scrubber attribute file */
 856 static DEVICE_ATTR(sdram_scrub_rate, 0, mci_sdram_scrub_rate_show,
 857             mci_sdram_scrub_rate_store); /* umode set later in is_visible */
 858
 859 static struct attribute *mci_attrs[] = {
 860         &dev_attr_reset_counters.attr,
 861         &dev_attr_mc_name.attr,
 862         &dev_attr_size_mb.attr,
 863         &dev_attr_seconds_since_reset.attr,
 864         &dev_attr_ue_noinfo_count.attr,
 865         &dev_attr_ce_noinfo_count.attr,
 866         &dev_attr_ue_count.attr,
 867         &dev_attr_ce_count.attr,
 868         &dev_attr_max_location.attr,
 869         &dev_attr_sdram_scrub_rate.attr,
 870         NULL
 871 };
 872
 873 static umode_t mci_attr_is_visible(struct kobject *kobj,
 874                                    struct attribute *attr, int idx)
 875 {
 876         struct device *dev = kobj_to_dev(kobj);
 877         struct mem_ctl_info *mci = to_mci(dev);
 878         umode_t mode = 0;
 879
 880         if (attr != &dev_attr_sdram_scrub_rate.attr)
 881                 return attr->mode;
 882         if (mci->get_sdram_scrub_rate)
 883                 mode |= S_IRUGO;
 884         if (mci->set_sdram_scrub_rate)
 885                 mode |= S_IWUSR;
 886         return mode;
 887 }
 888
 889 static const struct attribute_group mci_attr_grp = {
 890         .attrs  = mci_attrs,
 891         .is_visible = mci_attr_is_visible,
 892 };
 893
 894 static const struct attribute_group *mci_attr_groups[] = {
 895         &mci_attr_grp,
 896         NULL
 897 };
 898
 899 static void mci_attr_release(struct device *dev)
 900 {
 901         struct mem_ctl_info *mci = container_of(dev, struct mem_ctl_info, dev);
 902
 903         edac_dbg(1, "Releasing csrow device %s\n", dev_name(dev));
 904         kfree(mci);
 905 }
 906
 907 static const struct device_type mci_attr_type = {
 908         .groups         = mci_attr_groups,
 909         .release        = mci_attr_release,
 910 };
 911
 912 /*
 913  * Create a new Memory Controller kobject instance,
 914  *      mc<id> under the 'mc' directory
 915  *
 916  * Return:
 917  *      0       Success
 918  *      !0      Failure
 919  */
 920 int edac_create_sysfs_mci_device(struct mem_ctl_info *mci,
 921                                  const struct attribute_group **groups)
 922 {
 923         char *name;
 924         int i, err;
 925
 926         /*
 927          * The memory controller needs its own bus, in order to avoid
 928          * namespace conflicts at /sys/bus/edac.
 929          */
 930         name = kasprintf(GFP_KERNEL, "mc%d", mci->mc_idx);
 931         if (!name)
 932                 return -ENOMEM;
 933
 934         mci->bus->name = name;
 935
 936         edac_dbg(0, "creating bus %s\n", mci->bus->name);
 937
 938         err = bus_register(mci->bus);
 939         if (err < 0) {
 940                 kfree(name);
 941                 return err;
 942         }
 943
 944         /* get the /sys/devices/system/edac subsys reference */
 945         mci->dev.type = &mci_attr_type;
 946         device_initialize(&mci->dev);
 947
 948         mci->dev.parent = mci_pdev;
 949         mci->dev.bus = mci->bus;
 950         mci->dev.groups = groups;
 951         dev_set_name(&mci->dev, "mc%d", mci->mc_idx);
 952         dev_set_drvdata(&mci->dev, mci);
 953         pm_runtime_forbid(&mci->dev);
 954
 955         edac_dbg(0, "creating device %s\n", dev_name(&mci->dev));
 956         err = device_add(&mci->dev);
 957         if (err < 0) {
 958                 edac_dbg(1, "failure: create device %s\n", dev_name(&mci->dev));
 959                 goto fail_unregister_bus;
 960         }
 961
 962         /*
 963          * Create the dimm/rank devices
 964          */
 965         for (i = 0; i < mci->tot_dimms; i++) {
 966                 struct dimm_info *dimm = mci->dimms[i];
 967                 /* Only expose populated DIMMs */
 968                 if (!dimm->nr_pages)
 969                         continue;
 970
 971 #ifdef CONFIG_EDAC_DEBUG
 972                 edac_dbg(1, "creating dimm%d, located at ", i);
 973                 if (edac_debug_level >= 1) {
 974                         int lay;
 975                         for (lay = 0; lay < mci->n_layers; lay++)
 976                                 printk(KERN_CONT "%s %d ",
 977                                         edac_layer_name[mci->layers[lay].type],
 978                                         dimm->location[lay]);
 979                         printk(KERN_CONT "\n");
 980                 }
 981 #endif
 982                 err = edac_create_dimm_object(mci, dimm, i);
 983                 if (err) {
 984                         edac_dbg(1, "failure: create dimm %d obj\n", i);
 985                         goto fail_unregister_dimm;
 986                 }
 987         }
 988
 989 #ifdef CONFIG_EDAC_LEGACY_SYSFS
 990         err = edac_create_csrow_objects(mci);
 991         if (err < 0)
 992                 goto fail_unregister_dimm;
 993 #endif
 994
 995         edac_create_debugfs_nodes(mci);
 996         return 0;
 997
 998 fail_unregister_dimm:
 999         for (i--; i >= 0; i--) {
1000                 struct dimm_info *dimm = mci->dimms[i];
1001                 if (!dimm->nr_pages)
1002                         continue;
1003
1004                 device_unregister(&dimm->dev);
1005         }
1006         device_unregister(&mci->dev);
1007 fail_unregister_bus:
1008         bus_unregister(mci->bus);
1009         kfree(name);
1010
1011         return err;
1012 }
1013
1014 /*
1015  * remove a Memory Controller instance
1016  */
1017 void edac_remove_sysfs_mci_device(struct mem_ctl_info *mci)
1018 {
1019         int i;
1020
1021         edac_dbg(0, "\n");
1022
1023 #ifdef CONFIG_EDAC_DEBUG
1024         edac_debugfs_remove_recursive(mci->debugfs);
1025 #endif
1026 #ifdef CONFIG_EDAC_LEGACY_SYSFS
1027         edac_delete_csrow_objects(mci);
1028 #endif
1029
1030         for (i = 0; i < mci->tot_dimms; i++) {
1031                 struct dimm_info *dimm = mci->dimms[i];
1032                 if (dimm->nr_pages == 0)
1033                         continue;
1034                 edac_dbg(0, "removing device %s\n", dev_name(&dimm->dev));
1035                 device_unregister(&dimm->dev);
1036         }
1037 }
1038
1039 void edac_unregister_sysfs(struct mem_ctl_info *mci)
1040 {
1041         struct bus_type *bus = mci->bus;
1042         const char *name = mci->bus->name;
1043
1044         edac_dbg(1, "Unregistering device %s\n", dev_name(&mci->dev));
1045         device_unregister(&mci->dev);
1046         bus_unregister(bus);
1047         kfree(name);
1048 }
1049
1050 static void mc_attr_release(struct device *dev)
1051 {
1052         /*
1053          * There's no container structure here, as this is just the mci
1054          * parent device, used to create the /sys/devices/mc sysfs node.
1055          * So, there are no attributes on it.
1056          */
1057         edac_dbg(1, "Releasing device %s\n", dev_name(dev));
1058         kfree(dev);
1059 }
1060
1061 static const struct device_type mc_attr_type = {
1062         .release        = mc_attr_release,
1063 };
1064 /*
1065  * Init/exit code for the module. Basically, creates/removes /sys/class/rc
1066  */
1067 int __init edac_mc_sysfs_init(void)
1068 {
1069         int err;
1070
1071         mci_pdev = kzalloc(sizeof(*mci_pdev), GFP_KERNEL);
1072         if (!mci_pdev) {
1073                 err = -ENOMEM;
1074                 goto out;
1075         }
1076
1077         mci_pdev->bus = edac_get_sysfs_subsys();
1078         mci_pdev->type = &mc_attr_type;
1079         device_initialize(mci_pdev);
1080         dev_set_name(mci_pdev, "mc");
1081
1082         err = device_add(mci_pdev);
1083         if (err < 0)
1084                 goto out_put_device;
1085
1086         edac_dbg(0, "device %s created\n", dev_name(mci_pdev));
1087
1088         return 0;
1089
1090  out_put_device:
1091         put_device(mci_pdev);
1092  out:
1093         return err;
1094 }
1095
1096 void edac_mc_sysfs_exit(void)
1097 {
1098         device_unregister(mci_pdev);
1099 }