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         memcpy(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 DEVICE_CHANNEL(ch8_dimm_label, S_IRUGO | S_IWUSR,
 302         channel_dimm_label_show, channel_dimm_label_store, 8);
 303 DEVICE_CHANNEL(ch9_dimm_label, S_IRUGO | S_IWUSR,
 304         channel_dimm_label_show, channel_dimm_label_store, 9);
 305 DEVICE_CHANNEL(ch10_dimm_label, S_IRUGO | S_IWUSR,
 306         channel_dimm_label_show, channel_dimm_label_store, 10);
 307 DEVICE_CHANNEL(ch11_dimm_label, S_IRUGO | S_IWUSR,
 308         channel_dimm_label_show, channel_dimm_label_store, 11);
 309
 310 /* Total possible dynamic DIMM Label attribute file table */
 311 static struct attribute *dynamic_csrow_dimm_attr[] = {
 312         &dev_attr_legacy_ch0_dimm_label.attr.attr,
 313         &dev_attr_legacy_ch1_dimm_label.attr.attr,
 314         &dev_attr_legacy_ch2_dimm_label.attr.attr,
 315         &dev_attr_legacy_ch3_dimm_label.attr.attr,
 316         &dev_attr_legacy_ch4_dimm_label.attr.attr,
 317         &dev_attr_legacy_ch5_dimm_label.attr.attr,
 318         &dev_attr_legacy_ch6_dimm_label.attr.attr,
 319         &dev_attr_legacy_ch7_dimm_label.attr.attr,
 320         &dev_attr_legacy_ch8_dimm_label.attr.attr,
 321         &dev_attr_legacy_ch9_dimm_label.attr.attr,
 322         &dev_attr_legacy_ch10_dimm_label.attr.attr,
 323         &dev_attr_legacy_ch11_dimm_label.attr.attr,
 324         NULL
 325 };
 326
 327 /* possible dynamic channel ce_count attribute files */
 328 DEVICE_CHANNEL(ch0_ce_count, S_IRUGO,
 329                    channel_ce_count_show, NULL, 0);
 330 DEVICE_CHANNEL(ch1_ce_count, S_IRUGO,
 331                    channel_ce_count_show, NULL, 1);
 332 DEVICE_CHANNEL(ch2_ce_count, S_IRUGO,
 333                    channel_ce_count_show, NULL, 2);
 334 DEVICE_CHANNEL(ch3_ce_count, S_IRUGO,
 335                    channel_ce_count_show, NULL, 3);
 336 DEVICE_CHANNEL(ch4_ce_count, S_IRUGO,
 337                    channel_ce_count_show, NULL, 4);
 338 DEVICE_CHANNEL(ch5_ce_count, S_IRUGO,
 339                    channel_ce_count_show, NULL, 5);
 340 DEVICE_CHANNEL(ch6_ce_count, S_IRUGO,
 341                    channel_ce_count_show, NULL, 6);
 342 DEVICE_CHANNEL(ch7_ce_count, S_IRUGO,
 343                    channel_ce_count_show, NULL, 7);
 344 DEVICE_CHANNEL(ch8_ce_count, S_IRUGO,
 345                    channel_ce_count_show, NULL, 8);
 346 DEVICE_CHANNEL(ch9_ce_count, S_IRUGO,
 347                    channel_ce_count_show, NULL, 9);
 348 DEVICE_CHANNEL(ch10_ce_count, S_IRUGO,
 349                    channel_ce_count_show, NULL, 10);
 350 DEVICE_CHANNEL(ch11_ce_count, S_IRUGO,
 351                    channel_ce_count_show, NULL, 11);
 352
 353 /* Total possible dynamic ce_count attribute file table */
 354 static struct attribute *dynamic_csrow_ce_count_attr[] = {
 355         &dev_attr_legacy_ch0_ce_count.attr.attr,
 356         &dev_attr_legacy_ch1_ce_count.attr.attr,
 357         &dev_attr_legacy_ch2_ce_count.attr.attr,
 358         &dev_attr_legacy_ch3_ce_count.attr.attr,
 359         &dev_attr_legacy_ch4_ce_count.attr.attr,
 360         &dev_attr_legacy_ch5_ce_count.attr.attr,
 361         &dev_attr_legacy_ch6_ce_count.attr.attr,
 362         &dev_attr_legacy_ch7_ce_count.attr.attr,
 363         &dev_attr_legacy_ch8_ce_count.attr.attr,
 364         &dev_attr_legacy_ch9_ce_count.attr.attr,
 365         &dev_attr_legacy_ch10_ce_count.attr.attr,
 366         &dev_attr_legacy_ch11_ce_count.attr.attr,
 367         NULL
 368 };
 369
 370 static umode_t csrow_dev_is_visible(struct kobject *kobj,
 371                                     struct attribute *attr, int idx)
 372 {
 373         struct device *dev = kobj_to_dev(kobj);
 374         struct csrow_info *csrow = container_of(dev, struct csrow_info, dev);
 375
 376         if (idx >= csrow->nr_channels)
 377                 return 0;
 378
 379         if (idx >= ARRAY_SIZE(dynamic_csrow_ce_count_attr) - 1) {
 380                 WARN_ONCE(1, "idx: %d\n", idx);
 381                 return 0;
 382         }
 383
 384         /* Only expose populated DIMMs */
 385         if (!csrow->channels[idx]->dimm->nr_pages)
 386                 return 0;
 387
 388         return attr->mode;
 389 }
 390
 391
 392 static const struct attribute_group csrow_dev_dimm_group = {
 393         .attrs = dynamic_csrow_dimm_attr,
 394         .is_visible = csrow_dev_is_visible,
 395 };
 396
 397 static const struct attribute_group csrow_dev_ce_count_group = {
 398         .attrs = dynamic_csrow_ce_count_attr,
 399         .is_visible = csrow_dev_is_visible,
 400 };
 401
 402 static const struct attribute_group *csrow_dev_groups[] = {
 403         &csrow_dev_dimm_group,
 404         &csrow_dev_ce_count_group,
 405         NULL
 406 };
 407
 408 static void csrow_release(struct device *dev)
 409 {
 410         /*
 411          * Nothing to do, just unregister sysfs here. The mci
 412          * device owns the data and will also release it.
 413          */
 414 }
 415
 416 static inline int nr_pages_per_csrow(struct csrow_info *csrow)
 417 {
 418         int chan, nr_pages = 0;
 419
 420         for (chan = 0; chan < csrow->nr_channels; chan++)
 421                 nr_pages += csrow->channels[chan]->dimm->nr_pages;
 422
 423         return nr_pages;
 424 }
 425
 426 /* Create a CSROW object under specifed edac_mc_device */
 427 static int edac_create_csrow_object(struct mem_ctl_info *mci,
 428                                     struct csrow_info *csrow, int index)
 429 {
 430         int err;
 431
 432         csrow->dev.type = &csrow_attr_type;
 433         csrow->dev.groups = csrow_dev_groups;
 434         csrow->dev.release = csrow_release;
 435         device_initialize(&csrow->dev);
 436         csrow->dev.parent = &mci->dev;
 437         csrow->mci = mci;
 438         dev_set_name(&csrow->dev, "csrow%d", index);
 439         dev_set_drvdata(&csrow->dev, csrow);
 440
 441         err = device_add(&csrow->dev);
 442         if (err) {
 443                 edac_dbg(1, "failure: create device %s\n", dev_name(&csrow->dev));
 444                 put_device(&csrow->dev);
 445                 return err;
 446         }
 447
 448         edac_dbg(0, "device %s created\n", dev_name(&csrow->dev));
 449
 450         return 0;
 451 }
 452
 453 /* Create a CSROW object under specifed edac_mc_device */
 454 static int edac_create_csrow_objects(struct mem_ctl_info *mci)
 455 {
 456         int err, i;
 457         struct csrow_info *csrow;
 458
 459         for (i = 0; i < mci->nr_csrows; i++) {
 460                 csrow = mci->csrows[i];
 461                 if (!nr_pages_per_csrow(csrow))
 462                         continue;
 463                 err = edac_create_csrow_object(mci, mci->csrows[i], i);
 464                 if (err < 0)
 465                         goto error;
 466         }
 467         return 0;
 468
 469 error:
 470         for (--i; i >= 0; i--) {
 471                 if (device_is_registered(&mci->csrows[i]->dev))
 472                         device_unregister(&mci->csrows[i]->dev);
 473         }
 474
 475         return err;
 476 }
 477
 478 static void edac_delete_csrow_objects(struct mem_ctl_info *mci)
 479 {
 480         int i;
 481
 482         for (i = 0; i < mci->nr_csrows; i++) {
 483                 if (device_is_registered(&mci->csrows[i]->dev))
 484                         device_unregister(&mci->csrows[i]->dev);
 485         }
 486 }
 487
 488 #endif
 489
 490 /*
 491  * Per-dimm (or per-rank) devices
 492  */
 493
 494 #define to_dimm(k) container_of(k, struct dimm_info, dev)
 495
 496 /* show/store functions for DIMM Label attributes */
 497 static ssize_t dimmdev_location_show(struct device *dev,
 498                                      struct device_attribute *mattr, char *data)
 499 {
 500         struct dimm_info *dimm = to_dimm(dev);
 501         ssize_t count;
 502
 503         count = edac_dimm_info_location(dimm, data, PAGE_SIZE);
 504         count += scnprintf(data + count, PAGE_SIZE - count, "\n");
 505
 506         return count;
 507 }
 508
 509 static ssize_t dimmdev_label_show(struct device *dev,
 510                                   struct device_attribute *mattr, char *data)
 511 {
 512         struct dimm_info *dimm = to_dimm(dev);
 513
 514         /* if field has not been initialized, there is nothing to send */
 515         if (!dimm->label[0])
 516                 return 0;
 517
 518         return snprintf(data, sizeof(dimm->label) + 1, "%s\n", dimm->label);
 519 }
 520
 521 static ssize_t dimmdev_label_store(struct device *dev,
 522                                    struct device_attribute *mattr,
 523                                    const char *data,
 524                                    size_t count)
 525 {
 526         struct dimm_info *dimm = to_dimm(dev);
 527         size_t copy_count = count;
 528
 529         if (count == 0)
 530                 return -EINVAL;
 531
 532         if (data[count - 1] == '\0' || data[count - 1] == '\n')
 533                 copy_count -= 1;
 534
 535         if (copy_count == 0 || copy_count >= sizeof(dimm->label))
 536                 return -EINVAL;
 537
 538         memcpy(dimm->label, data, copy_count);
 539         dimm->label[copy_count] = '\0';
 540
 541         return count;
 542 }
 543
 544 static ssize_t dimmdev_size_show(struct device *dev,
 545                                  struct device_attribute *mattr, char *data)
 546 {
 547         struct dimm_info *dimm = to_dimm(dev);
 548
 549         return sprintf(data, "%u\n", PAGES_TO_MiB(dimm->nr_pages));
 550 }
 551
 552 static ssize_t dimmdev_mem_type_show(struct device *dev,
 553                                      struct device_attribute *mattr, char *data)
 554 {
 555         struct dimm_info *dimm = to_dimm(dev);
 556
 557         return sprintf(data, "%s\n", edac_mem_types[dimm->mtype]);
 558 }
 559
 560 static ssize_t dimmdev_dev_type_show(struct device *dev,
 561                                      struct device_attribute *mattr, char *data)
 562 {
 563         struct dimm_info *dimm = to_dimm(dev);
 564
 565         return sprintf(data, "%s\n", dev_types[dimm->dtype]);
 566 }
 567
 568 static ssize_t dimmdev_edac_mode_show(struct device *dev,
 569                                       struct device_attribute *mattr,
 570                                       char *data)
 571 {
 572         struct dimm_info *dimm = to_dimm(dev);
 573
 574         return sprintf(data, "%s\n", edac_caps[dimm->edac_mode]);
 575 }
 576
 577 static ssize_t dimmdev_ce_count_show(struct device *dev,
 578                                       struct device_attribute *mattr,
 579                                       char *data)
 580 {
 581         struct dimm_info *dimm = to_dimm(dev);
 582
 583         return sprintf(data, "%u\n", dimm->ce_count);
 584 }
 585
 586 static ssize_t dimmdev_ue_count_show(struct device *dev,
 587                                       struct device_attribute *mattr,
 588                                       char *data)
 589 {
 590         struct dimm_info *dimm = to_dimm(dev);
 591
 592         return sprintf(data, "%u\n", dimm->ue_count);
 593 }
 594
 595 /* dimm/rank attribute files */
 596 static DEVICE_ATTR(dimm_label, S_IRUGO | S_IWUSR,
 597                    dimmdev_label_show, dimmdev_label_store);
 598 static DEVICE_ATTR(dimm_location, S_IRUGO, dimmdev_location_show, NULL);
 599 static DEVICE_ATTR(size, S_IRUGO, dimmdev_size_show, NULL);
 600 static DEVICE_ATTR(dimm_mem_type, S_IRUGO, dimmdev_mem_type_show, NULL);
 601 static DEVICE_ATTR(dimm_dev_type, S_IRUGO, dimmdev_dev_type_show, NULL);
 602 static DEVICE_ATTR(dimm_edac_mode, S_IRUGO, dimmdev_edac_mode_show, NULL);
 603 static DEVICE_ATTR(dimm_ce_count, S_IRUGO, dimmdev_ce_count_show, NULL);
 604 static DEVICE_ATTR(dimm_ue_count, S_IRUGO, dimmdev_ue_count_show, NULL);
 605
 606 /* attributes of the dimm<id>/rank<id> object */
 607 static struct attribute *dimm_attrs[] = {
 608         &dev_attr_dimm_label.attr,
 609         &dev_attr_dimm_location.attr,
 610         &dev_attr_size.attr,
 611         &dev_attr_dimm_mem_type.attr,
 612         &dev_attr_dimm_dev_type.attr,
 613         &dev_attr_dimm_edac_mode.attr,
 614         &dev_attr_dimm_ce_count.attr,
 615         &dev_attr_dimm_ue_count.attr,
 616         NULL,
 617 };
 618
 619 static const struct attribute_group dimm_attr_grp = {
 620         .attrs  = dimm_attrs,
 621 };
 622
 623 static const struct attribute_group *dimm_attr_groups[] = {
 624         &dimm_attr_grp,
 625         NULL
 626 };
 627
 628 static const struct device_type dimm_attr_type = {
 629         .groups         = dimm_attr_groups,
 630 };
 631
 632 static void dimm_release(struct device *dev)
 633 {
 634         /*
 635          * Nothing to do, just unregister sysfs here. The mci
 636          * device owns the data and will also release it.
 637          */
 638 }
 639
 640 /* Create a DIMM object under specifed memory controller device */
 641 static int edac_create_dimm_object(struct mem_ctl_info *mci,
 642                                    struct dimm_info *dimm)
 643 {
 644         int err;
 645         dimm->mci = mci;
 646
 647         dimm->dev.type = &dimm_attr_type;
 648         dimm->dev.release = dimm_release;
 649         device_initialize(&dimm->dev);
 650
 651         dimm->dev.parent = &mci->dev;
 652         if (mci->csbased)
 653                 dev_set_name(&dimm->dev, "rank%d", dimm->idx);
 654         else
 655                 dev_set_name(&dimm->dev, "dimm%d", dimm->idx);
 656         dev_set_drvdata(&dimm->dev, dimm);
 657         pm_runtime_forbid(&mci->dev);
 658
 659         err = device_add(&dimm->dev);
 660         if (err) {
 661                 edac_dbg(1, "failure: create device %s\n", dev_name(&dimm->dev));
 662                 put_device(&dimm->dev);
 663                 return err;
 664         }
 665
 666         if (IS_ENABLED(CONFIG_EDAC_DEBUG)) {
 667                 char location[80];
 668
 669                 edac_dimm_info_location(dimm, location, sizeof(location));
 670                 edac_dbg(0, "device %s created at location %s\n",
 671                         dev_name(&dimm->dev), location);
 672         }
 673
 674         return 0;
 675 }
 676
 677 /*
 678  * Memory controller device
 679  */
 680
 681 #define to_mci(k) container_of(k, struct mem_ctl_info, dev)
 682
 683 static ssize_t mci_reset_counters_store(struct device *dev,
 684                                         struct device_attribute *mattr,
 685                                         const char *data, size_t count)
 686 {
 687         struct mem_ctl_info *mci = to_mci(dev);
 688         struct dimm_info *dimm;
 689         int row, chan;
 690
 691         mci->ue_mc = 0;
 692         mci->ce_mc = 0;
 693         mci->ue_noinfo_count = 0;
 694         mci->ce_noinfo_count = 0;
 695
 696         for (row = 0; row < mci->nr_csrows; row++) {
 697                 struct csrow_info *ri = mci->csrows[row];
 698
 699                 ri->ue_count = 0;
 700                 ri->ce_count = 0;
 701
 702                 for (chan = 0; chan < ri->nr_channels; chan++)
 703                         ri->channels[chan]->ce_count = 0;
 704         }
 705
 706         mci_for_each_dimm(mci, dimm) {
 707                 dimm->ue_count = 0;
 708                 dimm->ce_count = 0;
 709         }
 710
 711         mci->start_time = jiffies;
 712         return count;
 713 }
 714
 715 /* Memory scrubbing interface:
 716  *
 717  * A MC driver can limit the scrubbing bandwidth based on the CPU type.
 718  * Therefore, ->set_sdram_scrub_rate should be made to return the actual
 719  * bandwidth that is accepted or 0 when scrubbing is to be disabled.
 720  *
 721  * Negative value still means that an error has occurred while setting
 722  * the scrub rate.
 723  */
 724 static ssize_t mci_sdram_scrub_rate_store(struct device *dev,
 725                                           struct device_attribute *mattr,
 726                                           const char *data, size_t count)
 727 {
 728         struct mem_ctl_info *mci = to_mci(dev);
 729         unsigned long bandwidth = 0;
 730         int new_bw = 0;
 731
 732         if (kstrtoul(data, 10, &bandwidth) < 0)
 733                 return -EINVAL;
 734
 735         new_bw = mci->set_sdram_scrub_rate(mci, bandwidth);
 736         if (new_bw < 0) {
 737                 edac_printk(KERN_WARNING, EDAC_MC,
 738                             "Error setting scrub rate to: %lu\n", bandwidth);
 739                 return -EINVAL;
 740         }
 741
 742         return count;
 743 }
 744
 745 /*
 746  * ->get_sdram_scrub_rate() return value semantics same as above.
 747  */
 748 static ssize_t mci_sdram_scrub_rate_show(struct device *dev,
 749                                          struct device_attribute *mattr,
 750                                          char *data)
 751 {
 752         struct mem_ctl_info *mci = to_mci(dev);
 753         int bandwidth = 0;
 754
 755         bandwidth = mci->get_sdram_scrub_rate(mci);
 756         if (bandwidth < 0) {
 757                 edac_printk(KERN_DEBUG, EDAC_MC, "Error reading scrub rate\n");
 758                 return bandwidth;
 759         }
 760
 761         return sprintf(data, "%d\n", bandwidth);
 762 }
 763
 764 /* default attribute files for the MCI object */
 765 static ssize_t mci_ue_count_show(struct device *dev,
 766                                  struct device_attribute *mattr,
 767                                  char *data)
 768 {
 769         struct mem_ctl_info *mci = to_mci(dev);
 770
 771         return sprintf(data, "%u\n", mci->ue_mc);
 772 }
 773
 774 static ssize_t mci_ce_count_show(struct device *dev,
 775                                  struct device_attribute *mattr,
 776                                  char *data)
 777 {
 778         struct mem_ctl_info *mci = to_mci(dev);
 779
 780         return sprintf(data, "%u\n", mci->ce_mc);
 781 }
 782
 783 static ssize_t mci_ce_noinfo_show(struct device *dev,
 784                                   struct device_attribute *mattr,
 785                                   char *data)
 786 {
 787         struct mem_ctl_info *mci = to_mci(dev);
 788
 789         return sprintf(data, "%u\n", mci->ce_noinfo_count);
 790 }
 791
 792 static ssize_t mci_ue_noinfo_show(struct device *dev,
 793                                   struct device_attribute *mattr,
 794                                   char *data)
 795 {
 796         struct mem_ctl_info *mci = to_mci(dev);
 797
 798         return sprintf(data, "%u\n", mci->ue_noinfo_count);
 799 }
 800
 801 static ssize_t mci_seconds_show(struct device *dev,
 802                                 struct device_attribute *mattr,
 803                                 char *data)
 804 {
 805         struct mem_ctl_info *mci = to_mci(dev);
 806
 807         return sprintf(data, "%ld\n", (jiffies - mci->start_time) / HZ);
 808 }
 809
 810 static ssize_t mci_ctl_name_show(struct device *dev,
 811                                  struct device_attribute *mattr,
 812                                  char *data)
 813 {
 814         struct mem_ctl_info *mci = to_mci(dev);
 815
 816         return sprintf(data, "%s\n", mci->ctl_name);
 817 }
 818
 819 static ssize_t mci_size_mb_show(struct device *dev,
 820                                 struct device_attribute *mattr,
 821                                 char *data)
 822 {
 823         struct mem_ctl_info *mci = to_mci(dev);
 824         int total_pages = 0, csrow_idx, j;
 825
 826         for (csrow_idx = 0; csrow_idx < mci->nr_csrows; csrow_idx++) {
 827                 struct csrow_info *csrow = mci->csrows[csrow_idx];
 828
 829                 for (j = 0; j < csrow->nr_channels; j++) {
 830                         struct dimm_info *dimm = csrow->channels[j]->dimm;
 831
 832                         total_pages += dimm->nr_pages;
 833                 }
 834         }
 835
 836         return sprintf(data, "%u\n", PAGES_TO_MiB(total_pages));
 837 }
 838
 839 static ssize_t mci_max_location_show(struct device *dev,
 840                                      struct device_attribute *mattr,
 841                                      char *data)
 842 {
 843         struct mem_ctl_info *mci = to_mci(dev);
 844         int len = PAGE_SIZE;
 845         char *p = data;
 846         int i, n;
 847
 848         for (i = 0; i < mci->n_layers; i++) {
 849                 n = scnprintf(p, len, "%s %d ",
 850                               edac_layer_name[mci->layers[i].type],
 851                               mci->layers[i].size - 1);
 852                 len -= n;
 853                 if (len <= 0)
 854                         goto out;
 855
 856                 p += n;
 857         }
 858
 859         p += scnprintf(p, len, "\n");
 860 out:
 861         return p - data;
 862 }
 863
 864 /* default Control file */
 865 static DEVICE_ATTR(reset_counters, S_IWUSR, NULL, mci_reset_counters_store);
 866
 867 /* default Attribute files */
 868 static DEVICE_ATTR(mc_name, S_IRUGO, mci_ctl_name_show, NULL);
 869 static DEVICE_ATTR(size_mb, S_IRUGO, mci_size_mb_show, NULL);
 870 static DEVICE_ATTR(seconds_since_reset, S_IRUGO, mci_seconds_show, NULL);
 871 static DEVICE_ATTR(ue_noinfo_count, S_IRUGO, mci_ue_noinfo_show, NULL);
 872 static DEVICE_ATTR(ce_noinfo_count, S_IRUGO, mci_ce_noinfo_show, NULL);
 873 static DEVICE_ATTR(ue_count, S_IRUGO, mci_ue_count_show, NULL);
 874 static DEVICE_ATTR(ce_count, S_IRUGO, mci_ce_count_show, NULL);
 875 static DEVICE_ATTR(max_location, S_IRUGO, mci_max_location_show, NULL);
 876
 877 /* memory scrubber attribute file */
 878 static DEVICE_ATTR(sdram_scrub_rate, 0, mci_sdram_scrub_rate_show,
 879             mci_sdram_scrub_rate_store); /* umode set later in is_visible */
 880
 881 static struct attribute *mci_attrs[] = {
 882         &dev_attr_reset_counters.attr,
 883         &dev_attr_mc_name.attr,
 884         &dev_attr_size_mb.attr,
 885         &dev_attr_seconds_since_reset.attr,
 886         &dev_attr_ue_noinfo_count.attr,
 887         &dev_attr_ce_noinfo_count.attr,
 888         &dev_attr_ue_count.attr,
 889         &dev_attr_ce_count.attr,
 890         &dev_attr_max_location.attr,
 891         &dev_attr_sdram_scrub_rate.attr,
 892         NULL
 893 };
 894
 895 static umode_t mci_attr_is_visible(struct kobject *kobj,
 896                                    struct attribute *attr, int idx)
 897 {
 898         struct device *dev = kobj_to_dev(kobj);
 899         struct mem_ctl_info *mci = to_mci(dev);
 900         umode_t mode = 0;
 901
 902         if (attr != &dev_attr_sdram_scrub_rate.attr)
 903                 return attr->mode;
 904         if (mci->get_sdram_scrub_rate)
 905                 mode |= S_IRUGO;
 906         if (mci->set_sdram_scrub_rate)
 907                 mode |= S_IWUSR;
 908         return mode;
 909 }
 910
 911 static const struct attribute_group mci_attr_grp = {
 912         .attrs  = mci_attrs,
 913         .is_visible = mci_attr_is_visible,
 914 };
 915
 916 static const struct attribute_group *mci_attr_groups[] = {
 917         &mci_attr_grp,
 918         NULL
 919 };
 920
 921 static const struct device_type mci_attr_type = {
 922         .groups         = mci_attr_groups,
 923 };
 924
 925 /*
 926  * Create a new Memory Controller kobject instance,
 927  *      mc<id> under the 'mc' directory
 928  *
 929  * Return:
 930  *      0       Success
 931  *      !0      Failure
 932  */
 933 int edac_create_sysfs_mci_device(struct mem_ctl_info *mci,
 934                                  const struct attribute_group **groups)
 935 {
 936         struct dimm_info *dimm;
 937         int err;
 938
 939         /* get the /sys/devices/system/edac subsys reference */
 940         mci->dev.type = &mci_attr_type;
 941         mci->dev.parent = mci_pdev;
 942         mci->dev.groups = groups;
 943         dev_set_name(&mci->dev, "mc%d", mci->mc_idx);
 944         dev_set_drvdata(&mci->dev, mci);
 945         pm_runtime_forbid(&mci->dev);
 946
 947         err = device_add(&mci->dev);
 948         if (err < 0) {
 949                 edac_dbg(1, "failure: create device %s\n", dev_name(&mci->dev));
 950                 /* no put_device() here, free mci with _edac_mc_free() */
 951                 return err;
 952         }
 953
 954         edac_dbg(0, "device %s created\n", dev_name(&mci->dev));
 955
 956         /*
 957          * Create the dimm/rank devices
 958          */
 959         mci_for_each_dimm(mci, dimm) {
 960                 /* Only expose populated DIMMs */
 961                 if (!dimm->nr_pages)
 962                         continue;
 963
 964                 err = edac_create_dimm_object(mci, dimm);
 965                 if (err)
 966                         goto fail;
 967         }
 968
 969 #ifdef CONFIG_EDAC_LEGACY_SYSFS
 970         err = edac_create_csrow_objects(mci);
 971         if (err < 0)
 972                 goto fail;
 973 #endif
 974
 975         edac_create_debugfs_nodes(mci);
 976         return 0;
 977
 978 fail:
 979         edac_remove_sysfs_mci_device(mci);
 980
 981         return err;
 982 }
 983
 984 /*
 985  * remove a Memory Controller instance
 986  */
 987 void edac_remove_sysfs_mci_device(struct mem_ctl_info *mci)
 988 {
 989         struct dimm_info *dimm;
 990
 991         if (!device_is_registered(&mci->dev))
 992                 return;
 993
 994         edac_dbg(0, "\n");
 995
 996 #ifdef CONFIG_EDAC_DEBUG
 997         edac_debugfs_remove_recursive(mci->debugfs);
 998 #endif
 999 #ifdef CONFIG_EDAC_LEGACY_SYSFS
1000         edac_delete_csrow_objects(mci);
1001 #endif
1002
1003         mci_for_each_dimm(mci, dimm) {
1004                 if (!device_is_registered(&dimm->dev))
1005                         continue;
1006                 edac_dbg(1, "unregistering device %s\n", dev_name(&dimm->dev));
1007                 device_unregister(&dimm->dev);
1008         }
1009
1010         /* only remove the device, but keep mci */
1011         device_del(&mci->dev);
1012 }
1013
1014 static void mc_attr_release(struct device *dev)
1015 {
1016         /*
1017          * There's no container structure here, as this is just the mci
1018          * parent device, used to create the /sys/devices/mc sysfs node.
1019          * So, there are no attributes on it.
1020          */
1021         edac_dbg(1, "device %s released\n", dev_name(dev));
1022         kfree(dev);
1023 }
1024
1025 /*
1026  * Init/exit code for the module. Basically, creates/removes /sys/class/rc
1027  */
1028 int __init edac_mc_sysfs_init(void)
1029 {
1030         int err;
1031
1032         mci_pdev = kzalloc(sizeof(*mci_pdev), GFP_KERNEL);
1033         if (!mci_pdev)
1034                 return -ENOMEM;
1035
1036         mci_pdev->bus = edac_get_sysfs_subsys();
1037         mci_pdev->release = mc_attr_release;
1038         mci_pdev->init_name = "mc";
1039
1040         err = device_register(mci_pdev);
1041         if (err < 0) {
1042                 edac_dbg(1, "failure: create device %s\n", dev_name(mci_pdev));
1043                 put_device(mci_pdev);
1044                 return err;
1045         }
1046
1047         edac_dbg(0, "device %s created\n", dev_name(mci_pdev));
1048
1049         return 0;
1050 }
1051
1052 void edac_mc_sysfs_exit(void)
1053 {
1054         device_unregister(mci_pdev);
1055 }