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 sysfs_emit(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 sysfs_emit(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 sysfs_emit(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 sysfs_emit(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 sysfs_emit(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 sysfs_emit(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 sysfs_emit(data, "%s\n", rank->dimm->label);
 211 }
 212
 213 static ssize_t channel_dimm_label_store(struct device *dev,
 214                                         struct device_attribute *mattr,
 215                                         const char *data, size_t count)
 216 {
 217         struct csrow_info *csrow = to_csrow(dev);
 218         unsigned int chan = to_channel(mattr);
 219         struct rank_info *rank = csrow->channels[chan];
 220         size_t copy_count = count;
 221
 222         if (count == 0)
 223                 return -EINVAL;
 224
 225         if (data[count - 1] == '\0' || data[count - 1] == '\n')
 226                 copy_count -= 1;
 227
 228         if (copy_count == 0 || copy_count >= sizeof(rank->dimm->label))
 229                 return -EINVAL;
 230
 231         memcpy(rank->dimm->label, data, copy_count);
 232         rank->dimm->label[copy_count] = '\0';
 233
 234         return count;
 235 }
 236
 237 /* show function for dynamic chX_ce_count attribute */
 238 static ssize_t channel_ce_count_show(struct device *dev,
 239                                      struct device_attribute *mattr, char *data)
 240 {
 241         struct csrow_info *csrow = to_csrow(dev);
 242         unsigned int chan = to_channel(mattr);
 243         struct rank_info *rank = csrow->channels[chan];
 244
 245         return sysfs_emit(data, "%u\n", rank->ce_count);
 246 }
 247
 248 /* cwrow<id>/attribute files */
 249 DEVICE_ATTR_LEGACY(size_mb, S_IRUGO, csrow_size_show, NULL);
 250 DEVICE_ATTR_LEGACY(dev_type, S_IRUGO, csrow_dev_type_show, NULL);
 251 DEVICE_ATTR_LEGACY(mem_type, S_IRUGO, csrow_mem_type_show, NULL);
 252 DEVICE_ATTR_LEGACY(edac_mode, S_IRUGO, csrow_edac_mode_show, NULL);
 253 DEVICE_ATTR_LEGACY(ue_count, S_IRUGO, csrow_ue_count_show, NULL);
 254 DEVICE_ATTR_LEGACY(ce_count, S_IRUGO, csrow_ce_count_show, NULL);
 255
 256 /* default attributes of the CSROW<id> object */
 257 static struct attribute *csrow_attrs[] = {
 258         &dev_attr_legacy_dev_type.attr,
 259         &dev_attr_legacy_mem_type.attr,
 260         &dev_attr_legacy_edac_mode.attr,
 261         &dev_attr_legacy_size_mb.attr,
 262         &dev_attr_legacy_ue_count.attr,
 263         &dev_attr_legacy_ce_count.attr,
 264         NULL,
 265 };
 266
 267 static const struct attribute_group csrow_attr_grp = {
 268         .attrs  = csrow_attrs,
 269 };
 270
 271 static const struct attribute_group *csrow_attr_groups[] = {
 272         &csrow_attr_grp,
 273         NULL
 274 };
 275
 276 static const struct device_type csrow_attr_type = {
 277         .groups         = csrow_attr_groups,
 278 };
 279
 280 /*
 281  * possible dynamic channel DIMM Label attribute files
 282  *
 283  */
 284 DEVICE_CHANNEL(ch0_dimm_label, S_IRUGO | S_IWUSR,
 285         channel_dimm_label_show, channel_dimm_label_store, 0);
 286 DEVICE_CHANNEL(ch1_dimm_label, S_IRUGO | S_IWUSR,
 287         channel_dimm_label_show, channel_dimm_label_store, 1);
 288 DEVICE_CHANNEL(ch2_dimm_label, S_IRUGO | S_IWUSR,
 289         channel_dimm_label_show, channel_dimm_label_store, 2);
 290 DEVICE_CHANNEL(ch3_dimm_label, S_IRUGO | S_IWUSR,
 291         channel_dimm_label_show, channel_dimm_label_store, 3);
 292 DEVICE_CHANNEL(ch4_dimm_label, S_IRUGO | S_IWUSR,
 293         channel_dimm_label_show, channel_dimm_label_store, 4);
 294 DEVICE_CHANNEL(ch5_dimm_label, S_IRUGO | S_IWUSR,
 295         channel_dimm_label_show, channel_dimm_label_store, 5);
 296 DEVICE_CHANNEL(ch6_dimm_label, S_IRUGO | S_IWUSR,
 297         channel_dimm_label_show, channel_dimm_label_store, 6);
 298 DEVICE_CHANNEL(ch7_dimm_label, S_IRUGO | S_IWUSR,
 299         channel_dimm_label_show, channel_dimm_label_store, 7);
 300 DEVICE_CHANNEL(ch8_dimm_label, S_IRUGO | S_IWUSR,
 301         channel_dimm_label_show, channel_dimm_label_store, 8);
 302 DEVICE_CHANNEL(ch9_dimm_label, S_IRUGO | S_IWUSR,
 303         channel_dimm_label_show, channel_dimm_label_store, 9);
 304 DEVICE_CHANNEL(ch10_dimm_label, S_IRUGO | S_IWUSR,
 305         channel_dimm_label_show, channel_dimm_label_store, 10);
 306 DEVICE_CHANNEL(ch11_dimm_label, S_IRUGO | S_IWUSR,
 307         channel_dimm_label_show, channel_dimm_label_store, 11);
 308
 309 /* Total possible dynamic DIMM Label attribute file table */
 310 static struct attribute *dynamic_csrow_dimm_attr[] = {
 311         &dev_attr_legacy_ch0_dimm_label.attr.attr,
 312         &dev_attr_legacy_ch1_dimm_label.attr.attr,
 313         &dev_attr_legacy_ch2_dimm_label.attr.attr,
 314         &dev_attr_legacy_ch3_dimm_label.attr.attr,
 315         &dev_attr_legacy_ch4_dimm_label.attr.attr,
 316         &dev_attr_legacy_ch5_dimm_label.attr.attr,
 317         &dev_attr_legacy_ch6_dimm_label.attr.attr,
 318         &dev_attr_legacy_ch7_dimm_label.attr.attr,
 319         &dev_attr_legacy_ch8_dimm_label.attr.attr,
 320         &dev_attr_legacy_ch9_dimm_label.attr.attr,
 321         &dev_attr_legacy_ch10_dimm_label.attr.attr,
 322         &dev_attr_legacy_ch11_dimm_label.attr.attr,
 323         NULL
 324 };
 325
 326 /* possible dynamic channel ce_count attribute files */
 327 DEVICE_CHANNEL(ch0_ce_count, S_IRUGO,
 328                    channel_ce_count_show, NULL, 0);
 329 DEVICE_CHANNEL(ch1_ce_count, S_IRUGO,
 330                    channel_ce_count_show, NULL, 1);
 331 DEVICE_CHANNEL(ch2_ce_count, S_IRUGO,
 332                    channel_ce_count_show, NULL, 2);
 333 DEVICE_CHANNEL(ch3_ce_count, S_IRUGO,
 334                    channel_ce_count_show, NULL, 3);
 335 DEVICE_CHANNEL(ch4_ce_count, S_IRUGO,
 336                    channel_ce_count_show, NULL, 4);
 337 DEVICE_CHANNEL(ch5_ce_count, S_IRUGO,
 338                    channel_ce_count_show, NULL, 5);
 339 DEVICE_CHANNEL(ch6_ce_count, S_IRUGO,
 340                    channel_ce_count_show, NULL, 6);
 341 DEVICE_CHANNEL(ch7_ce_count, S_IRUGO,
 342                    channel_ce_count_show, NULL, 7);
 343 DEVICE_CHANNEL(ch8_ce_count, S_IRUGO,
 344                    channel_ce_count_show, NULL, 8);
 345 DEVICE_CHANNEL(ch9_ce_count, S_IRUGO,
 346                    channel_ce_count_show, NULL, 9);
 347 DEVICE_CHANNEL(ch10_ce_count, S_IRUGO,
 348                    channel_ce_count_show, NULL, 10);
 349 DEVICE_CHANNEL(ch11_ce_count, S_IRUGO,
 350                    channel_ce_count_show, NULL, 11);
 351
 352 /* Total possible dynamic ce_count attribute file table */
 353 static struct attribute *dynamic_csrow_ce_count_attr[] = {
 354         &dev_attr_legacy_ch0_ce_count.attr.attr,
 355         &dev_attr_legacy_ch1_ce_count.attr.attr,
 356         &dev_attr_legacy_ch2_ce_count.attr.attr,
 357         &dev_attr_legacy_ch3_ce_count.attr.attr,
 358         &dev_attr_legacy_ch4_ce_count.attr.attr,
 359         &dev_attr_legacy_ch5_ce_count.attr.attr,
 360         &dev_attr_legacy_ch6_ce_count.attr.attr,
 361         &dev_attr_legacy_ch7_ce_count.attr.attr,
 362         &dev_attr_legacy_ch8_ce_count.attr.attr,
 363         &dev_attr_legacy_ch9_ce_count.attr.attr,
 364         &dev_attr_legacy_ch10_ce_count.attr.attr,
 365         &dev_attr_legacy_ch11_ce_count.attr.attr,
 366         NULL
 367 };
 368
 369 static umode_t csrow_dev_is_visible(struct kobject *kobj,
 370                                     struct attribute *attr, int idx)
 371 {
 372         struct device *dev = kobj_to_dev(kobj);
 373         struct csrow_info *csrow = container_of(dev, struct csrow_info, dev);
 374
 375         if (idx >= csrow->nr_channels)
 376                 return 0;
 377
 378         if (idx >= ARRAY_SIZE(dynamic_csrow_ce_count_attr) - 1) {
 379                 WARN_ONCE(1, "idx: %d\n", idx);
 380                 return 0;
 381         }
 382
 383         /* Only expose populated DIMMs */
 384         if (!csrow->channels[idx]->dimm->nr_pages)
 385                 return 0;
 386
 387         return attr->mode;
 388 }
 389
 390
 391 static const struct attribute_group csrow_dev_dimm_group = {
 392         .attrs = dynamic_csrow_dimm_attr,
 393         .is_visible = csrow_dev_is_visible,
 394 };
 395
 396 static const struct attribute_group csrow_dev_ce_count_group = {
 397         .attrs = dynamic_csrow_ce_count_attr,
 398         .is_visible = csrow_dev_is_visible,
 399 };
 400
 401 static const struct attribute_group *csrow_dev_groups[] = {
 402         &csrow_dev_dimm_group,
 403         &csrow_dev_ce_count_group,
 404         NULL
 405 };
 406
 407 static void csrow_release(struct device *dev)
 408 {
 409         /*
 410          * Nothing to do, just unregister sysfs here. The mci
 411          * device owns the data and will also release it.
 412          */
 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         int err;
 430
 431         csrow->dev.type = &csrow_attr_type;
 432         csrow->dev.groups = csrow_dev_groups;
 433         csrow->dev.release = csrow_release;
 434         device_initialize(&csrow->dev);
 435         csrow->dev.parent = &mci->dev;
 436         csrow->mci = mci;
 437         dev_set_name(&csrow->dev, "csrow%d", index);
 438         dev_set_drvdata(&csrow->dev, csrow);
 439
 440         err = device_add(&csrow->dev);
 441         if (err) {
 442                 edac_dbg(1, "failure: create device %s\n", dev_name(&csrow->dev));
 443                 put_device(&csrow->dev);
 444                 return err;
 445         }
 446
 447         edac_dbg(0, "device %s created\n", dev_name(&csrow->dev));
 448
 449         return 0;
 450 }
 451
 452 /* Create a CSROW object under specifed edac_mc_device */
 453 static int edac_create_csrow_objects(struct mem_ctl_info *mci)
 454 {
 455         int err, i;
 456         struct csrow_info *csrow;
 457
 458         for (i = 0; i < mci->nr_csrows; i++) {
 459                 csrow = mci->csrows[i];
 460                 if (!nr_pages_per_csrow(csrow))
 461                         continue;
 462                 err = edac_create_csrow_object(mci, mci->csrows[i], i);
 463                 if (err < 0)
 464                         goto error;
 465         }
 466         return 0;
 467
 468 error:
 469         for (--i; i >= 0; i--) {
 470                 if (device_is_registered(&mci->csrows[i]->dev))
 471                         device_unregister(&mci->csrows[i]->dev);
 472         }
 473
 474         return err;
 475 }
 476
 477 static void edac_delete_csrow_objects(struct mem_ctl_info *mci)
 478 {
 479         int i;
 480
 481         for (i = 0; i < mci->nr_csrows; i++) {
 482                 if (device_is_registered(&mci->csrows[i]->dev))
 483                         device_unregister(&mci->csrows[i]->dev);
 484         }
 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         ssize_t count;
 501
 502         count = edac_dimm_info_location(dimm, data, PAGE_SIZE);
 503         count += scnprintf(data + count, PAGE_SIZE - count, "\n");
 504
 505         return count;
 506 }
 507
 508 static ssize_t dimmdev_label_show(struct device *dev,
 509                                   struct device_attribute *mattr, char *data)
 510 {
 511         struct dimm_info *dimm = to_dimm(dev);
 512
 513         /* if field has not been initialized, there is nothing to send */
 514         if (!dimm->label[0])
 515                 return 0;
 516
 517         return sysfs_emit(data, "%s\n", dimm->label);
 518 }
 519
 520 static ssize_t dimmdev_label_store(struct device *dev,
 521                                    struct device_attribute *mattr,
 522                                    const char *data,
 523                                    size_t count)
 524 {
 525         struct dimm_info *dimm = to_dimm(dev);
 526         size_t copy_count = count;
 527
 528         if (count == 0)
 529                 return -EINVAL;
 530
 531         if (data[count - 1] == '\0' || data[count - 1] == '\n')
 532                 copy_count -= 1;
 533
 534         if (copy_count == 0 || copy_count >= sizeof(dimm->label))
 535                 return -EINVAL;
 536
 537         memcpy(dimm->label, data, copy_count);
 538         dimm->label[copy_count] = '\0';
 539
 540         return count;
 541 }
 542
 543 static ssize_t dimmdev_size_show(struct device *dev,
 544                                  struct device_attribute *mattr, char *data)
 545 {
 546         struct dimm_info *dimm = to_dimm(dev);
 547
 548         return sysfs_emit(data, "%u\n", PAGES_TO_MiB(dimm->nr_pages));
 549 }
 550
 551 static ssize_t dimmdev_mem_type_show(struct device *dev,
 552                                      struct device_attribute *mattr, char *data)
 553 {
 554         struct dimm_info *dimm = to_dimm(dev);
 555
 556         return sysfs_emit(data, "%s\n", edac_mem_types[dimm->mtype]);
 557 }
 558
 559 static ssize_t dimmdev_dev_type_show(struct device *dev,
 560                                      struct device_attribute *mattr, char *data)
 561 {
 562         struct dimm_info *dimm = to_dimm(dev);
 563
 564         return sysfs_emit(data, "%s\n", dev_types[dimm->dtype]);
 565 }
 566
 567 static ssize_t dimmdev_edac_mode_show(struct device *dev,
 568                                       struct device_attribute *mattr,
 569                                       char *data)
 570 {
 571         struct dimm_info *dimm = to_dimm(dev);
 572
 573         return sysfs_emit(data, "%s\n", edac_caps[dimm->edac_mode]);
 574 }
 575
 576 static ssize_t dimmdev_ce_count_show(struct device *dev,
 577                                       struct device_attribute *mattr,
 578                                       char *data)
 579 {
 580         struct dimm_info *dimm = to_dimm(dev);
 581
 582         return sysfs_emit(data, "%u\n", dimm->ce_count);
 583 }
 584
 585 static ssize_t dimmdev_ue_count_show(struct device *dev,
 586                                       struct device_attribute *mattr,
 587                                       char *data)
 588 {
 589         struct dimm_info *dimm = to_dimm(dev);
 590
 591         return sysfs_emit(data, "%u\n", dimm->ue_count);
 592 }
 593
 594 /* dimm/rank attribute files */
 595 static DEVICE_ATTR(dimm_label, S_IRUGO | S_IWUSR,
 596                    dimmdev_label_show, dimmdev_label_store);
 597 static DEVICE_ATTR(dimm_location, S_IRUGO, dimmdev_location_show, NULL);
 598 static DEVICE_ATTR(size, S_IRUGO, dimmdev_size_show, NULL);
 599 static DEVICE_ATTR(dimm_mem_type, S_IRUGO, dimmdev_mem_type_show, NULL);
 600 static DEVICE_ATTR(dimm_dev_type, S_IRUGO, dimmdev_dev_type_show, NULL);
 601 static DEVICE_ATTR(dimm_edac_mode, S_IRUGO, dimmdev_edac_mode_show, NULL);
 602 static DEVICE_ATTR(dimm_ce_count, S_IRUGO, dimmdev_ce_count_show, NULL);
 603 static DEVICE_ATTR(dimm_ue_count, S_IRUGO, dimmdev_ue_count_show, NULL);
 604
 605 /* attributes of the dimm<id>/rank<id> object */
 606 static struct attribute *dimm_attrs[] = {
 607         &dev_attr_dimm_label.attr,
 608         &dev_attr_dimm_location.attr,
 609         &dev_attr_size.attr,
 610         &dev_attr_dimm_mem_type.attr,
 611         &dev_attr_dimm_dev_type.attr,
 612         &dev_attr_dimm_edac_mode.attr,
 613         &dev_attr_dimm_ce_count.attr,
 614         &dev_attr_dimm_ue_count.attr,
 615         NULL,
 616 };
 617
 618 static const struct attribute_group dimm_attr_grp = {
 619         .attrs  = dimm_attrs,
 620 };
 621
 622 static const struct attribute_group *dimm_attr_groups[] = {
 623         &dimm_attr_grp,
 624         NULL
 625 };
 626
 627 static const struct device_type dimm_attr_type = {
 628         .groups         = dimm_attr_groups,
 629 };
 630
 631 static void dimm_release(struct device *dev)
 632 {
 633         /*
 634          * Nothing to do, just unregister sysfs here. The mci
 635          * device owns the data and will also release it.
 636          */
 637 }
 638
 639 /* Create a DIMM object under specifed memory controller device */
 640 static int edac_create_dimm_object(struct mem_ctl_info *mci,
 641                                    struct dimm_info *dimm)
 642 {
 643         int err;
 644         dimm->mci = mci;
 645
 646         dimm->dev.type = &dimm_attr_type;
 647         dimm->dev.release = dimm_release;
 648         device_initialize(&dimm->dev);
 649
 650         dimm->dev.parent = &mci->dev;
 651         if (mci->csbased)
 652                 dev_set_name(&dimm->dev, "rank%d", dimm->idx);
 653         else
 654                 dev_set_name(&dimm->dev, "dimm%d", dimm->idx);
 655         dev_set_drvdata(&dimm->dev, dimm);
 656         pm_runtime_forbid(&mci->dev);
 657
 658         err = device_add(&dimm->dev);
 659         if (err) {
 660                 edac_dbg(1, "failure: create device %s\n", dev_name(&dimm->dev));
 661                 put_device(&dimm->dev);
 662                 return err;
 663         }
 664
 665         if (IS_ENABLED(CONFIG_EDAC_DEBUG)) {
 666                 char location[80];
 667
 668                 edac_dimm_info_location(dimm, location, sizeof(location));
 669                 edac_dbg(0, "device %s created at location %s\n",
 670                         dev_name(&dimm->dev), location);
 671         }
 672
 673         return 0;
 674 }
 675
 676 /*
 677  * Memory controller device
 678  */
 679
 680 #define to_mci(k) container_of(k, struct mem_ctl_info, dev)
 681
 682 static ssize_t mci_reset_counters_store(struct device *dev,
 683                                         struct device_attribute *mattr,
 684                                         const char *data, size_t count)
 685 {
 686         struct mem_ctl_info *mci = to_mci(dev);
 687         struct dimm_info *dimm;
 688         int row, chan;
 689
 690         mci->ue_mc = 0;
 691         mci->ce_mc = 0;
 692         mci->ue_noinfo_count = 0;
 693         mci->ce_noinfo_count = 0;
 694
 695         for (row = 0; row < mci->nr_csrows; row++) {
 696                 struct csrow_info *ri = mci->csrows[row];
 697
 698                 ri->ue_count = 0;
 699                 ri->ce_count = 0;
 700
 701                 for (chan = 0; chan < ri->nr_channels; chan++)
 702                         ri->channels[chan]->ce_count = 0;
 703         }
 704
 705         mci_for_each_dimm(mci, dimm) {
 706                 dimm->ue_count = 0;
 707                 dimm->ce_count = 0;
 708         }
 709
 710         mci->start_time = jiffies;
 711         return count;
 712 }
 713
 714 /* Memory scrubbing interface:
 715  *
 716  * A MC driver can limit the scrubbing bandwidth based on the CPU type.
 717  * Therefore, ->set_sdram_scrub_rate should be made to return the actual
 718  * bandwidth that is accepted or 0 when scrubbing is to be disabled.
 719  *
 720  * Negative value still means that an error has occurred while setting
 721  * the scrub rate.
 722  */
 723 static ssize_t mci_sdram_scrub_rate_store(struct device *dev,
 724                                           struct device_attribute *mattr,
 725                                           const char *data, size_t count)
 726 {
 727         struct mem_ctl_info *mci = to_mci(dev);
 728         unsigned long bandwidth = 0;
 729         int new_bw = 0;
 730
 731         if (kstrtoul(data, 10, &bandwidth) < 0)
 732                 return -EINVAL;
 733
 734         new_bw = mci->set_sdram_scrub_rate(mci, bandwidth);
 735         if (new_bw < 0) {
 736                 edac_printk(KERN_WARNING, EDAC_MC,
 737                             "Error setting scrub rate to: %lu\n", bandwidth);
 738                 return -EINVAL;
 739         }
 740
 741         return count;
 742 }
 743
 744 /*
 745  * ->get_sdram_scrub_rate() return value semantics same as above.
 746  */
 747 static ssize_t mci_sdram_scrub_rate_show(struct device *dev,
 748                                          struct device_attribute *mattr,
 749                                          char *data)
 750 {
 751         struct mem_ctl_info *mci = to_mci(dev);
 752         int bandwidth = 0;
 753
 754         bandwidth = mci->get_sdram_scrub_rate(mci);
 755         if (bandwidth < 0) {
 756                 edac_printk(KERN_DEBUG, EDAC_MC, "Error reading scrub rate\n");
 757                 return bandwidth;
 758         }
 759
 760         return sysfs_emit(data, "%d\n", bandwidth);
 761 }
 762
 763 /* default attribute files for the MCI object */
 764 static ssize_t mci_ue_count_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 sysfs_emit(data, "%u\n", mci->ue_mc);
 771 }
 772
 773 static ssize_t mci_ce_count_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 sysfs_emit(data, "%u\n", mci->ce_mc);
 780 }
 781
 782 static ssize_t mci_ce_noinfo_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 sysfs_emit(data, "%u\n", mci->ce_noinfo_count);
 789 }
 790
 791 static ssize_t mci_ue_noinfo_show(struct device *dev,
 792                                   struct device_attribute *mattr,
 793                                   char *data)
 794 {
 795         struct mem_ctl_info *mci = to_mci(dev);
 796
 797         return sysfs_emit(data, "%u\n", mci->ue_noinfo_count);
 798 }
 799
 800 static ssize_t mci_seconds_show(struct device *dev,
 801                                 struct device_attribute *mattr,
 802                                 char *data)
 803 {
 804         struct mem_ctl_info *mci = to_mci(dev);
 805
 806         return sysfs_emit(data, "%ld\n", (jiffies - mci->start_time) / HZ);
 807 }
 808
 809 static ssize_t mci_ctl_name_show(struct device *dev,
 810                                  struct device_attribute *mattr,
 811                                  char *data)
 812 {
 813         struct mem_ctl_info *mci = to_mci(dev);
 814
 815         return sysfs_emit(data, "%s\n", mci->ctl_name);
 816 }
 817
 818 static ssize_t mci_size_mb_show(struct device *dev,
 819                                 struct device_attribute *mattr,
 820                                 char *data)
 821 {
 822         struct mem_ctl_info *mci = to_mci(dev);
 823         int total_pages = 0, csrow_idx, j;
 824
 825         for (csrow_idx = 0; csrow_idx < mci->nr_csrows; csrow_idx++) {
 826                 struct csrow_info *csrow = mci->csrows[csrow_idx];
 827
 828                 for (j = 0; j < csrow->nr_channels; j++) {
 829                         struct dimm_info *dimm = csrow->channels[j]->dimm;
 830
 831                         total_pages += dimm->nr_pages;
 832                 }
 833         }
 834
 835         return sysfs_emit(data, "%u\n", PAGES_TO_MiB(total_pages));
 836 }
 837
 838 static ssize_t mci_max_location_show(struct device *dev,
 839                                      struct device_attribute *mattr,
 840                                      char *data)
 841 {
 842         struct mem_ctl_info *mci = to_mci(dev);
 843         int len = PAGE_SIZE;
 844         char *p = data;
 845         int i, n;
 846
 847         for (i = 0; i < mci->n_layers; i++) {
 848                 n = scnprintf(p, len, "%s %d ",
 849                               edac_layer_name[mci->layers[i].type],
 850                               mci->layers[i].size - 1);
 851                 len -= n;
 852                 if (len <= 0)
 853                         goto out;
 854
 855                 p += n;
 856         }
 857
 858         p += scnprintf(p, len, "\n");
 859 out:
 860         return p - data;
 861 }
 862
 863 /* default Control file */
 864 static DEVICE_ATTR(reset_counters, S_IWUSR, NULL, mci_reset_counters_store);
 865
 866 /* default Attribute files */
 867 static DEVICE_ATTR(mc_name, S_IRUGO, mci_ctl_name_show, NULL);
 868 static DEVICE_ATTR(size_mb, S_IRUGO, mci_size_mb_show, NULL);
 869 static DEVICE_ATTR(seconds_since_reset, S_IRUGO, mci_seconds_show, NULL);
 870 static DEVICE_ATTR(ue_noinfo_count, S_IRUGO, mci_ue_noinfo_show, NULL);
 871 static DEVICE_ATTR(ce_noinfo_count, S_IRUGO, mci_ce_noinfo_show, NULL);
 872 static DEVICE_ATTR(ue_count, S_IRUGO, mci_ue_count_show, NULL);
 873 static DEVICE_ATTR(ce_count, S_IRUGO, mci_ce_count_show, NULL);
 874 static DEVICE_ATTR(max_location, S_IRUGO, mci_max_location_show, NULL);
 875
 876 /* memory scrubber attribute file */
 877 static DEVICE_ATTR(sdram_scrub_rate, 0, mci_sdram_scrub_rate_show,
 878             mci_sdram_scrub_rate_store); /* umode set later in is_visible */
 879
 880 static struct attribute *mci_attrs[] = {
 881         &dev_attr_reset_counters.attr,
 882         &dev_attr_mc_name.attr,
 883         &dev_attr_size_mb.attr,
 884         &dev_attr_seconds_since_reset.attr,
 885         &dev_attr_ue_noinfo_count.attr,
 886         &dev_attr_ce_noinfo_count.attr,
 887         &dev_attr_ue_count.attr,
 888         &dev_attr_ce_count.attr,
 889         &dev_attr_max_location.attr,
 890         &dev_attr_sdram_scrub_rate.attr,
 891         NULL
 892 };
 893
 894 static umode_t mci_attr_is_visible(struct kobject *kobj,
 895                                    struct attribute *attr, int idx)
 896 {
 897         struct device *dev = kobj_to_dev(kobj);
 898         struct mem_ctl_info *mci = to_mci(dev);
 899         umode_t mode = 0;
 900
 901         if (attr != &dev_attr_sdram_scrub_rate.attr)
 902                 return attr->mode;
 903         if (mci->get_sdram_scrub_rate)
 904                 mode |= S_IRUGO;
 905         if (mci->set_sdram_scrub_rate)
 906                 mode |= S_IWUSR;
 907         return mode;
 908 }
 909
 910 static const struct attribute_group mci_attr_grp = {
 911         .attrs  = mci_attrs,
 912         .is_visible = mci_attr_is_visible,
 913 };
 914
 915 static const struct attribute_group *mci_attr_groups[] = {
 916         &mci_attr_grp,
 917         NULL
 918 };
 919
 920 static const struct device_type mci_attr_type = {
 921         .groups         = mci_attr_groups,
 922 };
 923
 924 /*
 925  * Create a new Memory Controller kobject instance,
 926  *      mc<id> under the 'mc' directory
 927  *
 928  * Return:
 929  *      0       Success
 930  *      !0      Failure
 931  */
 932 int edac_create_sysfs_mci_device(struct mem_ctl_info *mci,
 933                                  const struct attribute_group **groups)
 934 {
 935         struct dimm_info *dimm;
 936         int err;
 937
 938         /* get the /sys/devices/system/edac subsys reference */
 939         mci->dev.type = &mci_attr_type;
 940         mci->dev.parent = mci_pdev;
 941         mci->dev.groups = groups;
 942         dev_set_name(&mci->dev, "mc%d", mci->mc_idx);
 943         dev_set_drvdata(&mci->dev, mci);
 944         pm_runtime_forbid(&mci->dev);
 945
 946         err = device_add(&mci->dev);
 947         if (err < 0) {
 948                 edac_dbg(1, "failure: create device %s\n", dev_name(&mci->dev));
 949                 /* no put_device() here, free mci with _edac_mc_free() */
 950                 return err;
 951         }
 952
 953         edac_dbg(0, "device %s created\n", dev_name(&mci->dev));
 954
 955         /*
 956          * Create the dimm/rank devices
 957          */
 958         mci_for_each_dimm(mci, dimm) {
 959                 /* Only expose populated DIMMs */
 960                 if (!dimm->nr_pages)
 961                         continue;
 962
 963                 err = edac_create_dimm_object(mci, dimm);
 964                 if (err)
 965                         goto fail;
 966         }
 967
 968 #ifdef CONFIG_EDAC_LEGACY_SYSFS
 969         err = edac_create_csrow_objects(mci);
 970         if (err < 0)
 971                 goto fail;
 972 #endif
 973
 974         edac_create_debugfs_nodes(mci);
 975         return 0;
 976
 977 fail:
 978         edac_remove_sysfs_mci_device(mci);
 979
 980         return err;
 981 }
 982
 983 /*
 984  * remove a Memory Controller instance
 985  */
 986 void edac_remove_sysfs_mci_device(struct mem_ctl_info *mci)
 987 {
 988         struct dimm_info *dimm;
 989
 990         if (!device_is_registered(&mci->dev))
 991                 return;
 992
 993         edac_dbg(0, "\n");
 994
 995 #ifdef CONFIG_EDAC_DEBUG
 996         edac_debugfs_remove_recursive(mci->debugfs);
 997 #endif
 998 #ifdef CONFIG_EDAC_LEGACY_SYSFS
 999         edac_delete_csrow_objects(mci);
1000 #endif
1001
1002         mci_for_each_dimm(mci, dimm) {
1003                 if (!device_is_registered(&dimm->dev))
1004                         continue;
1005                 edac_dbg(1, "unregistering device %s\n", dev_name(&dimm->dev));
1006                 device_unregister(&dimm->dev);
1007         }
1008
1009         /* only remove the device, but keep mci */
1010         device_del(&mci->dev);
1011 }
1012
1013 static void mc_attr_release(struct device *dev)
1014 {
1015         /*
1016          * There's no container structure here, as this is just the mci
1017          * parent device, used to create the /sys/devices/mc sysfs node.
1018          * So, there are no attributes on it.
1019          */
1020         edac_dbg(1, "device %s released\n", dev_name(dev));
1021         kfree(dev);
1022 }
1023
1024 /*
1025  * Init/exit code for the module. Basically, creates/removes /sys/class/rc
1026  */
1027 int __init edac_mc_sysfs_init(void)
1028 {
1029         int err;
1030
1031         mci_pdev = kzalloc(sizeof(*mci_pdev), GFP_KERNEL);
1032         if (!mci_pdev)
1033                 return -ENOMEM;
1034
1035         mci_pdev->bus = edac_get_sysfs_subsys();
1036         mci_pdev->release = mc_attr_release;
1037         mci_pdev->init_name = "mc";
1038
1039         err = device_register(mci_pdev);
1040         if (err < 0) {
1041                 edac_dbg(1, "failure: create device %s\n", dev_name(mci_pdev));
1042                 put_device(mci_pdev);
1043                 return err;
1044         }
1045
1046         edac_dbg(0, "device %s created\n", dev_name(mci_pdev));
1047
1048         return 0;
1049 }
1050
1051 void edac_mc_sysfs_exit(void)
1052 {
1053         device_unregister(mci_pdev);
1054 }