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         unsigned 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 int 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 int 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 int 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 const struct device_type csrow_attr_type = {
 278         .groups         = csrow_attr_groups,
 279 };
 280
 281 /*
 282  * possible dynamic channel DIMM Label attribute files
 283  *
 284  */
 285 DEVICE_CHANNEL(ch0_dimm_label, S_IRUGO | S_IWUSR,
 286         channel_dimm_label_show, channel_dimm_label_store, 0);
 287 DEVICE_CHANNEL(ch1_dimm_label, S_IRUGO | S_IWUSR,
 288         channel_dimm_label_show, channel_dimm_label_store, 1);
 289 DEVICE_CHANNEL(ch2_dimm_label, S_IRUGO | S_IWUSR,
 290         channel_dimm_label_show, channel_dimm_label_store, 2);
 291 DEVICE_CHANNEL(ch3_dimm_label, S_IRUGO | S_IWUSR,
 292         channel_dimm_label_show, channel_dimm_label_store, 3);
 293 DEVICE_CHANNEL(ch4_dimm_label, S_IRUGO | S_IWUSR,
 294         channel_dimm_label_show, channel_dimm_label_store, 4);
 295 DEVICE_CHANNEL(ch5_dimm_label, S_IRUGO | S_IWUSR,
 296         channel_dimm_label_show, channel_dimm_label_store, 5);
 297 DEVICE_CHANNEL(ch6_dimm_label, S_IRUGO | S_IWUSR,
 298         channel_dimm_label_show, channel_dimm_label_store, 6);
 299 DEVICE_CHANNEL(ch7_dimm_label, S_IRUGO | S_IWUSR,
 300         channel_dimm_label_show, channel_dimm_label_store, 7);
 301
 302 /* Total possible dynamic DIMM Label attribute file table */
 303 static struct attribute *dynamic_csrow_dimm_attr[] = {
 304         &dev_attr_legacy_ch0_dimm_label.attr.attr,
 305         &dev_attr_legacy_ch1_dimm_label.attr.attr,
 306         &dev_attr_legacy_ch2_dimm_label.attr.attr,
 307         &dev_attr_legacy_ch3_dimm_label.attr.attr,
 308         &dev_attr_legacy_ch4_dimm_label.attr.attr,
 309         &dev_attr_legacy_ch5_dimm_label.attr.attr,
 310         &dev_attr_legacy_ch6_dimm_label.attr.attr,
 311         &dev_attr_legacy_ch7_dimm_label.attr.attr,
 312         NULL
 313 };
 314
 315 /* possible dynamic channel ce_count attribute files */
 316 DEVICE_CHANNEL(ch0_ce_count, S_IRUGO,
 317                    channel_ce_count_show, NULL, 0);
 318 DEVICE_CHANNEL(ch1_ce_count, S_IRUGO,
 319                    channel_ce_count_show, NULL, 1);
 320 DEVICE_CHANNEL(ch2_ce_count, S_IRUGO,
 321                    channel_ce_count_show, NULL, 2);
 322 DEVICE_CHANNEL(ch3_ce_count, S_IRUGO,
 323                    channel_ce_count_show, NULL, 3);
 324 DEVICE_CHANNEL(ch4_ce_count, S_IRUGO,
 325                    channel_ce_count_show, NULL, 4);
 326 DEVICE_CHANNEL(ch5_ce_count, S_IRUGO,
 327                    channel_ce_count_show, NULL, 5);
 328 DEVICE_CHANNEL(ch6_ce_count, S_IRUGO,
 329                    channel_ce_count_show, NULL, 6);
 330 DEVICE_CHANNEL(ch7_ce_count, S_IRUGO,
 331                    channel_ce_count_show, NULL, 7);
 332
 333 /* Total possible dynamic ce_count attribute file table */
 334 static struct attribute *dynamic_csrow_ce_count_attr[] = {
 335         &dev_attr_legacy_ch0_ce_count.attr.attr,
 336         &dev_attr_legacy_ch1_ce_count.attr.attr,
 337         &dev_attr_legacy_ch2_ce_count.attr.attr,
 338         &dev_attr_legacy_ch3_ce_count.attr.attr,
 339         &dev_attr_legacy_ch4_ce_count.attr.attr,
 340         &dev_attr_legacy_ch5_ce_count.attr.attr,
 341         &dev_attr_legacy_ch6_ce_count.attr.attr,
 342         &dev_attr_legacy_ch7_ce_count.attr.attr,
 343         NULL
 344 };
 345
 346 static umode_t csrow_dev_is_visible(struct kobject *kobj,
 347                                     struct attribute *attr, int idx)
 348 {
 349         struct device *dev = kobj_to_dev(kobj);
 350         struct csrow_info *csrow = container_of(dev, struct csrow_info, dev);
 351
 352         if (idx >= csrow->nr_channels)
 353                 return 0;
 354
 355         if (idx >= ARRAY_SIZE(dynamic_csrow_ce_count_attr) - 1) {
 356                 WARN_ONCE(1, "idx: %d\n", idx);
 357                 return 0;
 358         }
 359
 360         /* Only expose populated DIMMs */
 361         if (!csrow->channels[idx]->dimm->nr_pages)
 362                 return 0;
 363
 364         return attr->mode;
 365 }
 366
 367
 368 static const struct attribute_group csrow_dev_dimm_group = {
 369         .attrs = dynamic_csrow_dimm_attr,
 370         .is_visible = csrow_dev_is_visible,
 371 };
 372
 373 static const struct attribute_group csrow_dev_ce_count_group = {
 374         .attrs = dynamic_csrow_ce_count_attr,
 375         .is_visible = csrow_dev_is_visible,
 376 };
 377
 378 static const struct attribute_group *csrow_dev_groups[] = {
 379         &csrow_dev_dimm_group,
 380         &csrow_dev_ce_count_group,
 381         NULL
 382 };
 383
 384 static void csrow_release(struct device *dev)
 385 {
 386         /*
 387          * Nothing to do, just unregister sysfs here. The mci
 388          * device owns the data and will also release it.
 389          */
 390 }
 391
 392 static inline int nr_pages_per_csrow(struct csrow_info *csrow)
 393 {
 394         int chan, nr_pages = 0;
 395
 396         for (chan = 0; chan < csrow->nr_channels; chan++)
 397                 nr_pages += csrow->channels[chan]->dimm->nr_pages;
 398
 399         return nr_pages;
 400 }
 401
 402 /* Create a CSROW object under specifed edac_mc_device */
 403 static int edac_create_csrow_object(struct mem_ctl_info *mci,
 404                                     struct csrow_info *csrow, int index)
 405 {
 406         int err;
 407
 408         csrow->dev.type = &csrow_attr_type;
 409         csrow->dev.groups = csrow_dev_groups;
 410         csrow->dev.release = csrow_release;
 411         device_initialize(&csrow->dev);
 412         csrow->dev.parent = &mci->dev;
 413         csrow->mci = mci;
 414         dev_set_name(&csrow->dev, "csrow%d", index);
 415         dev_set_drvdata(&csrow->dev, csrow);
 416
 417         err = device_add(&csrow->dev);
 418         if (err) {
 419                 edac_dbg(1, "failure: create device %s\n", dev_name(&csrow->dev));
 420                 put_device(&csrow->dev);
 421                 return err;
 422         }
 423
 424         edac_dbg(0, "device %s created\n", dev_name(&csrow->dev));
 425
 426         return 0;
 427 }
 428
 429 /* Create a CSROW object under specifed edac_mc_device */
 430 static int edac_create_csrow_objects(struct mem_ctl_info *mci)
 431 {
 432         int err, i;
 433         struct csrow_info *csrow;
 434
 435         for (i = 0; i < mci->nr_csrows; i++) {
 436                 csrow = mci->csrows[i];
 437                 if (!nr_pages_per_csrow(csrow))
 438                         continue;
 439                 err = edac_create_csrow_object(mci, mci->csrows[i], i);
 440                 if (err < 0)
 441                         goto error;
 442         }
 443         return 0;
 444
 445 error:
 446         for (--i; i >= 0; i--) {
 447                 if (device_is_registered(&mci->csrows[i]->dev))
 448                         device_unregister(&mci->csrows[i]->dev);
 449         }
 450
 451         return err;
 452 }
 453
 454 static void edac_delete_csrow_objects(struct mem_ctl_info *mci)
 455 {
 456         int i;
 457
 458         for (i = 0; i < mci->nr_csrows; i++) {
 459                 if (device_is_registered(&mci->csrows[i]->dev))
 460                         device_unregister(&mci->csrows[i]->dev);
 461         }
 462 }
 463
 464 #endif
 465
 466 /*
 467  * Per-dimm (or per-rank) devices
 468  */
 469
 470 #define to_dimm(k) container_of(k, struct dimm_info, dev)
 471
 472 /* show/store functions for DIMM Label attributes */
 473 static ssize_t dimmdev_location_show(struct device *dev,
 474                                      struct device_attribute *mattr, char *data)
 475 {
 476         struct dimm_info *dimm = to_dimm(dev);
 477
 478         return edac_dimm_info_location(dimm, data, PAGE_SIZE);
 479 }
 480
 481 static ssize_t dimmdev_label_show(struct device *dev,
 482                                   struct device_attribute *mattr, char *data)
 483 {
 484         struct dimm_info *dimm = to_dimm(dev);
 485
 486         /* if field has not been initialized, there is nothing to send */
 487         if (!dimm->label[0])
 488                 return 0;
 489
 490         return snprintf(data, sizeof(dimm->label) + 1, "%s\n", dimm->label);
 491 }
 492
 493 static ssize_t dimmdev_label_store(struct device *dev,
 494                                    struct device_attribute *mattr,
 495                                    const char *data,
 496                                    size_t count)
 497 {
 498         struct dimm_info *dimm = to_dimm(dev);
 499         size_t copy_count = count;
 500
 501         if (count == 0)
 502                 return -EINVAL;
 503
 504         if (data[count - 1] == '\0' || data[count - 1] == '\n')
 505                 copy_count -= 1;
 506
 507         if (copy_count == 0 || copy_count >= sizeof(dimm->label))
 508                 return -EINVAL;
 509
 510         strncpy(dimm->label, data, copy_count);
 511         dimm->label[copy_count] = '\0';
 512
 513         return count;
 514 }
 515
 516 static ssize_t dimmdev_size_show(struct device *dev,
 517                                  struct device_attribute *mattr, char *data)
 518 {
 519         struct dimm_info *dimm = to_dimm(dev);
 520
 521         return sprintf(data, "%u\n", PAGES_TO_MiB(dimm->nr_pages));
 522 }
 523
 524 static ssize_t dimmdev_mem_type_show(struct device *dev,
 525                                      struct device_attribute *mattr, char *data)
 526 {
 527         struct dimm_info *dimm = to_dimm(dev);
 528
 529         return sprintf(data, "%s\n", edac_mem_types[dimm->mtype]);
 530 }
 531
 532 static ssize_t dimmdev_dev_type_show(struct device *dev,
 533                                      struct device_attribute *mattr, char *data)
 534 {
 535         struct dimm_info *dimm = to_dimm(dev);
 536
 537         return sprintf(data, "%s\n", dev_types[dimm->dtype]);
 538 }
 539
 540 static ssize_t dimmdev_edac_mode_show(struct device *dev,
 541                                       struct device_attribute *mattr,
 542                                       char *data)
 543 {
 544         struct dimm_info *dimm = to_dimm(dev);
 545
 546         return sprintf(data, "%s\n", edac_caps[dimm->edac_mode]);
 547 }
 548
 549 static ssize_t dimmdev_ce_count_show(struct device *dev,
 550                                       struct device_attribute *mattr,
 551                                       char *data)
 552 {
 553         struct dimm_info *dimm = to_dimm(dev);
 554
 555         return sprintf(data, "%u\n", dimm->ce_count);
 556 }
 557
 558 static ssize_t dimmdev_ue_count_show(struct device *dev,
 559                                       struct device_attribute *mattr,
 560                                       char *data)
 561 {
 562         struct dimm_info *dimm = to_dimm(dev);
 563
 564         return sprintf(data, "%u\n", dimm->ue_count);
 565 }
 566
 567 /* dimm/rank attribute files */
 568 static DEVICE_ATTR(dimm_label, S_IRUGO | S_IWUSR,
 569                    dimmdev_label_show, dimmdev_label_store);
 570 static DEVICE_ATTR(dimm_location, S_IRUGO, dimmdev_location_show, NULL);
 571 static DEVICE_ATTR(size, S_IRUGO, dimmdev_size_show, NULL);
 572 static DEVICE_ATTR(dimm_mem_type, S_IRUGO, dimmdev_mem_type_show, NULL);
 573 static DEVICE_ATTR(dimm_dev_type, S_IRUGO, dimmdev_dev_type_show, NULL);
 574 static DEVICE_ATTR(dimm_edac_mode, S_IRUGO, dimmdev_edac_mode_show, NULL);
 575 static DEVICE_ATTR(dimm_ce_count, S_IRUGO, dimmdev_ce_count_show, NULL);
 576 static DEVICE_ATTR(dimm_ue_count, S_IRUGO, dimmdev_ue_count_show, NULL);
 577
 578 /* attributes of the dimm<id>/rank<id> object */
 579 static struct attribute *dimm_attrs[] = {
 580         &dev_attr_dimm_label.attr,
 581         &dev_attr_dimm_location.attr,
 582         &dev_attr_size.attr,
 583         &dev_attr_dimm_mem_type.attr,
 584         &dev_attr_dimm_dev_type.attr,
 585         &dev_attr_dimm_edac_mode.attr,
 586         &dev_attr_dimm_ce_count.attr,
 587         &dev_attr_dimm_ue_count.attr,
 588         NULL,
 589 };
 590
 591 static const struct attribute_group dimm_attr_grp = {
 592         .attrs  = dimm_attrs,
 593 };
 594
 595 static const struct attribute_group *dimm_attr_groups[] = {
 596         &dimm_attr_grp,
 597         NULL
 598 };
 599
 600 static const struct device_type dimm_attr_type = {
 601         .groups         = dimm_attr_groups,
 602 };
 603
 604 static void dimm_release(struct device *dev)
 605 {
 606         /*
 607          * Nothing to do, just unregister sysfs here. The mci
 608          * device owns the data and will also release it.
 609          */
 610 }
 611
 612 /* Create a DIMM object under specifed memory controller device */
 613 static int edac_create_dimm_object(struct mem_ctl_info *mci,
 614                                    struct dimm_info *dimm)
 615 {
 616         int err;
 617         dimm->mci = mci;
 618
 619         dimm->dev.type = &dimm_attr_type;
 620         dimm->dev.release = dimm_release;
 621         device_initialize(&dimm->dev);
 622
 623         dimm->dev.parent = &mci->dev;
 624         if (mci->csbased)
 625                 dev_set_name(&dimm->dev, "rank%d", dimm->idx);
 626         else
 627                 dev_set_name(&dimm->dev, "dimm%d", dimm->idx);
 628         dev_set_drvdata(&dimm->dev, dimm);
 629         pm_runtime_forbid(&mci->dev);
 630
 631         err = device_add(&dimm->dev);
 632         if (err) {
 633                 edac_dbg(1, "failure: create device %s\n", dev_name(&dimm->dev));
 634                 put_device(&dimm->dev);
 635                 return err;
 636         }
 637
 638         if (IS_ENABLED(CONFIG_EDAC_DEBUG)) {
 639                 char location[80];
 640
 641                 edac_dimm_info_location(dimm, location, sizeof(location));
 642                 edac_dbg(0, "device %s created at location %s\n",
 643                         dev_name(&dimm->dev), location);
 644         }
 645
 646         return 0;
 647 }
 648
 649 /*
 650  * Memory controller device
 651  */
 652
 653 #define to_mci(k) container_of(k, struct mem_ctl_info, dev)
 654
 655 static ssize_t mci_reset_counters_store(struct device *dev,
 656                                         struct device_attribute *mattr,
 657                                         const char *data, size_t count)
 658 {
 659         struct mem_ctl_info *mci = to_mci(dev);
 660         struct dimm_info *dimm;
 661         int row, chan;
 662
 663         mci->ue_mc = 0;
 664         mci->ce_mc = 0;
 665         mci->ue_noinfo_count = 0;
 666         mci->ce_noinfo_count = 0;
 667
 668         for (row = 0; row < mci->nr_csrows; row++) {
 669                 struct csrow_info *ri = mci->csrows[row];
 670
 671                 ri->ue_count = 0;
 672                 ri->ce_count = 0;
 673
 674                 for (chan = 0; chan < ri->nr_channels; chan++)
 675                         ri->channels[chan]->ce_count = 0;
 676         }
 677
 678         mci_for_each_dimm(mci, dimm) {
 679                 dimm->ue_count = 0;
 680                 dimm->ce_count = 0;
 681         }
 682
 683         mci->start_time = jiffies;
 684         return count;
 685 }
 686
 687 /* Memory scrubbing interface:
 688  *
 689  * A MC driver can limit the scrubbing bandwidth based on the CPU type.
 690  * Therefore, ->set_sdram_scrub_rate should be made to return the actual
 691  * bandwidth that is accepted or 0 when scrubbing is to be disabled.
 692  *
 693  * Negative value still means that an error has occurred while setting
 694  * the scrub rate.
 695  */
 696 static ssize_t mci_sdram_scrub_rate_store(struct device *dev,
 697                                           struct device_attribute *mattr,
 698                                           const char *data, size_t count)
 699 {
 700         struct mem_ctl_info *mci = to_mci(dev);
 701         unsigned long bandwidth = 0;
 702         int new_bw = 0;
 703
 704         if (kstrtoul(data, 10, &bandwidth) < 0)
 705                 return -EINVAL;
 706
 707         new_bw = mci->set_sdram_scrub_rate(mci, bandwidth);
 708         if (new_bw < 0) {
 709                 edac_printk(KERN_WARNING, EDAC_MC,
 710                             "Error setting scrub rate to: %lu\n", bandwidth);
 711                 return -EINVAL;
 712         }
 713
 714         return count;
 715 }
 716
 717 /*
 718  * ->get_sdram_scrub_rate() return value semantics same as above.
 719  */
 720 static ssize_t mci_sdram_scrub_rate_show(struct device *dev,
 721                                          struct device_attribute *mattr,
 722                                          char *data)
 723 {
 724         struct mem_ctl_info *mci = to_mci(dev);
 725         int bandwidth = 0;
 726
 727         bandwidth = mci->get_sdram_scrub_rate(mci);
 728         if (bandwidth < 0) {
 729                 edac_printk(KERN_DEBUG, EDAC_MC, "Error reading scrub rate\n");
 730                 return bandwidth;
 731         }
 732
 733         return sprintf(data, "%d\n", bandwidth);
 734 }
 735
 736 /* default attribute files for the MCI object */
 737 static ssize_t mci_ue_count_show(struct device *dev,
 738                                  struct device_attribute *mattr,
 739                                  char *data)
 740 {
 741         struct mem_ctl_info *mci = to_mci(dev);
 742
 743         return sprintf(data, "%d\n", mci->ue_mc);
 744 }
 745
 746 static ssize_t mci_ce_count_show(struct device *dev,
 747                                  struct device_attribute *mattr,
 748                                  char *data)
 749 {
 750         struct mem_ctl_info *mci = to_mci(dev);
 751
 752         return sprintf(data, "%d\n", mci->ce_mc);
 753 }
 754
 755 static ssize_t mci_ce_noinfo_show(struct device *dev,
 756                                   struct device_attribute *mattr,
 757                                   char *data)
 758 {
 759         struct mem_ctl_info *mci = to_mci(dev);
 760
 761         return sprintf(data, "%d\n", mci->ce_noinfo_count);
 762 }
 763
 764 static ssize_t mci_ue_noinfo_show(struct device *dev,
 765                                   struct device_attribute *mattr,
 766                                   char *data)
 767 {
 768         struct mem_ctl_info *mci = to_mci(dev);
 769
 770         return sprintf(data, "%d\n", mci->ue_noinfo_count);
 771 }
 772
 773 static ssize_t mci_seconds_show(struct device *dev,
 774                                 struct device_attribute *mattr,
 775                                 char *data)
 776 {
 777         struct mem_ctl_info *mci = to_mci(dev);
 778
 779         return sprintf(data, "%ld\n", (jiffies - mci->start_time) / HZ);
 780 }
 781
 782 static ssize_t mci_ctl_name_show(struct device *dev,
 783                                  struct device_attribute *mattr,
 784                                  char *data)
 785 {
 786         struct mem_ctl_info *mci = to_mci(dev);
 787
 788         return sprintf(data, "%s\n", mci->ctl_name);
 789 }
 790
 791 static ssize_t mci_size_mb_show(struct device *dev,
 792                                 struct device_attribute *mattr,
 793                                 char *data)
 794 {
 795         struct mem_ctl_info *mci = to_mci(dev);
 796         int total_pages = 0, csrow_idx, j;
 797
 798         for (csrow_idx = 0; csrow_idx < mci->nr_csrows; csrow_idx++) {
 799                 struct csrow_info *csrow = mci->csrows[csrow_idx];
 800
 801                 for (j = 0; j < csrow->nr_channels; j++) {
 802                         struct dimm_info *dimm = csrow->channels[j]->dimm;
 803
 804                         total_pages += dimm->nr_pages;
 805                 }
 806         }
 807
 808         return sprintf(data, "%u\n", PAGES_TO_MiB(total_pages));
 809 }
 810
 811 static ssize_t mci_max_location_show(struct device *dev,
 812                                      struct device_attribute *mattr,
 813                                      char *data)
 814 {
 815         struct mem_ctl_info *mci = to_mci(dev);
 816         int i;
 817         char *p = data;
 818
 819         for (i = 0; i < mci->n_layers; i++) {
 820                 p += sprintf(p, "%s %d ",
 821                              edac_layer_name[mci->layers[i].type],
 822                              mci->layers[i].size - 1);
 823         }
 824
 825         return p - data;
 826 }
 827
 828 /* default Control file */
 829 static DEVICE_ATTR(reset_counters, S_IWUSR, NULL, mci_reset_counters_store);
 830
 831 /* default Attribute files */
 832 static DEVICE_ATTR(mc_name, S_IRUGO, mci_ctl_name_show, NULL);
 833 static DEVICE_ATTR(size_mb, S_IRUGO, mci_size_mb_show, NULL);
 834 static DEVICE_ATTR(seconds_since_reset, S_IRUGO, mci_seconds_show, NULL);
 835 static DEVICE_ATTR(ue_noinfo_count, S_IRUGO, mci_ue_noinfo_show, NULL);
 836 static DEVICE_ATTR(ce_noinfo_count, S_IRUGO, mci_ce_noinfo_show, NULL);
 837 static DEVICE_ATTR(ue_count, S_IRUGO, mci_ue_count_show, NULL);
 838 static DEVICE_ATTR(ce_count, S_IRUGO, mci_ce_count_show, NULL);
 839 static DEVICE_ATTR(max_location, S_IRUGO, mci_max_location_show, NULL);
 840
 841 /* memory scrubber attribute file */
 842 static DEVICE_ATTR(sdram_scrub_rate, 0, mci_sdram_scrub_rate_show,
 843             mci_sdram_scrub_rate_store); /* umode set later in is_visible */
 844
 845 static struct attribute *mci_attrs[] = {
 846         &dev_attr_reset_counters.attr,
 847         &dev_attr_mc_name.attr,
 848         &dev_attr_size_mb.attr,
 849         &dev_attr_seconds_since_reset.attr,
 850         &dev_attr_ue_noinfo_count.attr,
 851         &dev_attr_ce_noinfo_count.attr,
 852         &dev_attr_ue_count.attr,
 853         &dev_attr_ce_count.attr,
 854         &dev_attr_max_location.attr,
 855         &dev_attr_sdram_scrub_rate.attr,
 856         NULL
 857 };
 858
 859 static umode_t mci_attr_is_visible(struct kobject *kobj,
 860                                    struct attribute *attr, int idx)
 861 {
 862         struct device *dev = kobj_to_dev(kobj);
 863         struct mem_ctl_info *mci = to_mci(dev);
 864         umode_t mode = 0;
 865
 866         if (attr != &dev_attr_sdram_scrub_rate.attr)
 867                 return attr->mode;
 868         if (mci->get_sdram_scrub_rate)
 869                 mode |= S_IRUGO;
 870         if (mci->set_sdram_scrub_rate)
 871                 mode |= S_IWUSR;
 872         return mode;
 873 }
 874
 875 static const struct attribute_group mci_attr_grp = {
 876         .attrs  = mci_attrs,
 877         .is_visible = mci_attr_is_visible,
 878 };
 879
 880 static const struct attribute_group *mci_attr_groups[] = {
 881         &mci_attr_grp,
 882         NULL
 883 };
 884
 885 static const struct device_type mci_attr_type = {
 886         .groups         = mci_attr_groups,
 887 };
 888
 889 /*
 890  * Create a new Memory Controller kobject instance,
 891  *      mc<id> under the 'mc' directory
 892  *
 893  * Return:
 894  *      0       Success
 895  *      !0      Failure
 896  */
 897 int edac_create_sysfs_mci_device(struct mem_ctl_info *mci,
 898                                  const struct attribute_group **groups)
 899 {
 900         struct dimm_info *dimm;
 901         int err;
 902
 903         /* get the /sys/devices/system/edac subsys reference */
 904         mci->dev.type = &mci_attr_type;
 905         mci->dev.parent = mci_pdev;
 906         mci->dev.groups = groups;
 907         dev_set_name(&mci->dev, "mc%d", mci->mc_idx);
 908         dev_set_drvdata(&mci->dev, mci);
 909         pm_runtime_forbid(&mci->dev);
 910
 911         err = device_add(&mci->dev);
 912         if (err < 0) {
 913                 edac_dbg(1, "failure: create device %s\n", dev_name(&mci->dev));
 914                 /* no put_device() here, free mci with _edac_mc_free() */
 915                 return err;
 916         }
 917
 918         edac_dbg(0, "device %s created\n", dev_name(&mci->dev));
 919
 920         /*
 921          * Create the dimm/rank devices
 922          */
 923         mci_for_each_dimm(mci, dimm) {
 924                 /* Only expose populated DIMMs */
 925                 if (!dimm->nr_pages)
 926                         continue;
 927
 928                 err = edac_create_dimm_object(mci, dimm);
 929                 if (err)
 930                         goto fail;
 931         }
 932
 933 #ifdef CONFIG_EDAC_LEGACY_SYSFS
 934         err = edac_create_csrow_objects(mci);
 935         if (err < 0)
 936                 goto fail;
 937 #endif
 938
 939         edac_create_debugfs_nodes(mci);
 940         return 0;
 941
 942 fail:
 943         edac_remove_sysfs_mci_device(mci);
 944
 945         return err;
 946 }
 947
 948 /*
 949  * remove a Memory Controller instance
 950  */
 951 void edac_remove_sysfs_mci_device(struct mem_ctl_info *mci)
 952 {
 953         struct dimm_info *dimm;
 954
 955         if (!device_is_registered(&mci->dev))
 956                 return;
 957
 958         edac_dbg(0, "\n");
 959
 960 #ifdef CONFIG_EDAC_DEBUG
 961         edac_debugfs_remove_recursive(mci->debugfs);
 962 #endif
 963 #ifdef CONFIG_EDAC_LEGACY_SYSFS
 964         edac_delete_csrow_objects(mci);
 965 #endif
 966
 967         mci_for_each_dimm(mci, dimm) {
 968                 if (!device_is_registered(&dimm->dev))
 969                         continue;
 970                 edac_dbg(1, "unregistering device %s\n", dev_name(&dimm->dev));
 971                 device_unregister(&dimm->dev);
 972         }
 973
 974         /* only remove the device, but keep mci */
 975         device_del(&mci->dev);
 976 }
 977
 978 static void mc_attr_release(struct device *dev)
 979 {
 980         /*
 981          * There's no container structure here, as this is just the mci
 982          * parent device, used to create the /sys/devices/mc sysfs node.
 983          * So, there are no attributes on it.
 984          */
 985         edac_dbg(1, "device %s released\n", dev_name(dev));
 986         kfree(dev);
 987 }
 988
 989 /*
 990  * Init/exit code for the module. Basically, creates/removes /sys/class/rc
 991  */
 992 int __init edac_mc_sysfs_init(void)
 993 {
 994         int err;
 995
 996         mci_pdev = kzalloc(sizeof(*mci_pdev), GFP_KERNEL);
 997         if (!mci_pdev)
 998                 return -ENOMEM;
 999
1000         mci_pdev->bus = edac_get_sysfs_subsys();
1001         mci_pdev->release = mc_attr_release;
1002         mci_pdev->init_name = "mc";
1003
1004         err = device_register(mci_pdev);
1005         if (err < 0) {
1006                 edac_dbg(1, "failure: create device %s\n", dev_name(mci_pdev));
1007                 put_device(mci_pdev);
1008                 return err;
1009         }
1010
1011         edac_dbg(0, "device %s created\n", dev_name(mci_pdev));
1012
1013         return 0;
1014 }
1015
1016 void edac_mc_sysfs_exit(void)
1017 {
1018         device_unregister(mci_pdev);
1019 }