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_core.h"
  23 #include "edac_module.h"
  24
  25 /* MC EDAC Controls, setable by module parameter, and sysfs */
  26 static int edac_mc_log_ue = 1;
  27 static int edac_mc_log_ce = 1;
  28 static int edac_mc_panic_on_ue;
  29 static int edac_mc_poll_msec = 1000;
  30
  31 /* Getter functions for above */
  32 int edac_mc_get_log_ue(void)
  33 {
  34         return edac_mc_log_ue;
  35 }
  36
  37 int edac_mc_get_log_ce(void)
  38 {
  39         return edac_mc_log_ce;
  40 }
  41
  42 int edac_mc_get_panic_on_ue(void)
  43 {
  44         return edac_mc_panic_on_ue;
  45 }
  46
  47 /* this is temporary */
  48 int edac_mc_get_poll_msec(void)
  49 {
  50         return edac_mc_poll_msec;
  51 }
  52
  53 static int edac_set_poll_msec(const char *val, struct kernel_param *kp)
  54 {
  55         unsigned long l;
  56         int ret;
  57
  58         if (!val)
  59                 return -EINVAL;
  60
  61         ret = kstrtoul(val, 0, &l);
  62         if (ret)
  63                 return ret;
  64
  65         if (l < 1000)
  66                 return -EINVAL;
  67
  68         *((unsigned long *)kp->arg) = l;
  69
  70         /* notify edac_mc engine to reset the poll period */
  71         edac_mc_reset_delay_period(l);
  72
  73         return 0;
  74 }
  75
  76 /* Parameter declarations for above */
  77 module_param(edac_mc_panic_on_ue, int, 0644);
  78 MODULE_PARM_DESC(edac_mc_panic_on_ue, "Panic on uncorrected error: 0=off 1=on");
  79 module_param(edac_mc_log_ue, int, 0644);
  80 MODULE_PARM_DESC(edac_mc_log_ue,
  81                  "Log uncorrectable error to console: 0=off 1=on");
  82 module_param(edac_mc_log_ce, int, 0644);
  83 MODULE_PARM_DESC(edac_mc_log_ce,
  84                  "Log correctable error to console: 0=off 1=on");
  85 module_param_call(edac_mc_poll_msec, edac_set_poll_msec, param_get_int,
  86                   &edac_mc_poll_msec, 0644);
  87 MODULE_PARM_DESC(edac_mc_poll_msec, "Polling period in milliseconds");
  88
  89 static struct device *mci_pdev;
  90
  91 /*
  92  * various constants for Memory Controllers
  93  */
  94 static const char * const mem_types[] = {
  95         [MEM_EMPTY] = "Empty",
  96         [MEM_RESERVED] = "Reserved",
  97         [MEM_UNKNOWN] = "Unknown",
  98         [MEM_FPM] = "FPM",
  99         [MEM_EDO] = "EDO",
 100         [MEM_BEDO] = "BEDO",
 101         [MEM_SDR] = "Unbuffered-SDR",
 102         [MEM_RDR] = "Registered-SDR",
 103         [MEM_DDR] = "Unbuffered-DDR",
 104         [MEM_RDDR] = "Registered-DDR",
 105         [MEM_RMBS] = "RMBS",
 106         [MEM_DDR2] = "Unbuffered-DDR2",
 107         [MEM_FB_DDR2] = "FullyBuffered-DDR2",
 108         [MEM_RDDR2] = "Registered-DDR2",
 109         [MEM_XDR] = "XDR",
 110         [MEM_DDR3] = "Unbuffered-DDR3",
 111         [MEM_RDDR3] = "Registered-DDR3",
 112         [MEM_DDR4] = "Unbuffered-DDR4",
 113         [MEM_RDDR4] = "Registered-DDR4"
 114 };
 115
 116 static const char * const dev_types[] = {
 117         [DEV_UNKNOWN] = "Unknown",
 118         [DEV_X1] = "x1",
 119         [DEV_X2] = "x2",
 120         [DEV_X4] = "x4",
 121         [DEV_X8] = "x8",
 122         [DEV_X16] = "x16",
 123         [DEV_X32] = "x32",
 124         [DEV_X64] = "x64"
 125 };
 126
 127 static const char * const edac_caps[] = {
 128         [EDAC_UNKNOWN] = "Unknown",
 129         [EDAC_NONE] = "None",
 130         [EDAC_RESERVED] = "Reserved",
 131         [EDAC_PARITY] = "PARITY",
 132         [EDAC_EC] = "EC",
 133         [EDAC_SECDED] = "SECDED",
 134         [EDAC_S2ECD2ED] = "S2ECD2ED",
 135         [EDAC_S4ECD4ED] = "S4ECD4ED",
 136         [EDAC_S8ECD8ED] = "S8ECD8ED",
 137         [EDAC_S16ECD16ED] = "S16ECD16ED"
 138 };
 139
 140 #ifdef CONFIG_EDAC_LEGACY_SYSFS
 141 /*
 142  * EDAC sysfs CSROW data structures and methods
 143  */
 144
 145 #define to_csrow(k) container_of(k, struct csrow_info, dev)
 146
 147 /*
 148  * We need it to avoid namespace conflicts between the legacy API
 149  * and the per-dimm/per-rank one
 150  */
 151 #define DEVICE_ATTR_LEGACY(_name, _mode, _show, _store) \
 152         static struct device_attribute dev_attr_legacy_##_name = __ATTR(_name, _mode, _show, _store)
 153
 154 struct dev_ch_attribute {
 155         struct device_attribute attr;
 156         int channel;
 157 };
 158
 159 #define DEVICE_CHANNEL(_name, _mode, _show, _store, _var) \
 160         static struct dev_ch_attribute dev_attr_legacy_##_name = \
 161                 { __ATTR(_name, _mode, _show, _store), (_var) }
 162
 163 #define to_channel(k) (container_of(k, struct dev_ch_attribute, attr)->channel)
 164
 165 /* Set of more default csrow<id> attribute show/store functions */
 166 static ssize_t csrow_ue_count_show(struct device *dev,
 167                                    struct device_attribute *mattr, char *data)
 168 {
 169         struct csrow_info *csrow = to_csrow(dev);
 170
 171         return sprintf(data, "%u\n", csrow->ue_count);
 172 }
 173
 174 static ssize_t csrow_ce_count_show(struct device *dev,
 175                                    struct device_attribute *mattr, char *data)
 176 {
 177         struct csrow_info *csrow = to_csrow(dev);
 178
 179         return sprintf(data, "%u\n", csrow->ce_count);
 180 }
 181
 182 static ssize_t csrow_size_show(struct device *dev,
 183                                struct device_attribute *mattr, char *data)
 184 {
 185         struct csrow_info *csrow = to_csrow(dev);
 186         int i;
 187         u32 nr_pages = 0;
 188
 189         for (i = 0; i < csrow->nr_channels; i++)
 190                 nr_pages += csrow->channels[i]->dimm->nr_pages;
 191         return sprintf(data, "%u\n", PAGES_TO_MiB(nr_pages));
 192 }
 193
 194 static ssize_t csrow_mem_type_show(struct device *dev,
 195                                    struct device_attribute *mattr, char *data)
 196 {
 197         struct csrow_info *csrow = to_csrow(dev);
 198
 199         return sprintf(data, "%s\n", mem_types[csrow->channels[0]->dimm->mtype]);
 200 }
 201
 202 static ssize_t csrow_dev_type_show(struct device *dev,
 203                                    struct device_attribute *mattr, char *data)
 204 {
 205         struct csrow_info *csrow = to_csrow(dev);
 206
 207         return sprintf(data, "%s\n", dev_types[csrow->channels[0]->dimm->dtype]);
 208 }
 209
 210 static ssize_t csrow_edac_mode_show(struct device *dev,
 211                                     struct device_attribute *mattr,
 212                                     char *data)
 213 {
 214         struct csrow_info *csrow = to_csrow(dev);
 215
 216         return sprintf(data, "%s\n", edac_caps[csrow->channels[0]->dimm->edac_mode]);
 217 }
 218
 219 /* show/store functions for DIMM Label attributes */
 220 static ssize_t channel_dimm_label_show(struct device *dev,
 221                                        struct device_attribute *mattr,
 222                                        char *data)
 223 {
 224         struct csrow_info *csrow = to_csrow(dev);
 225         unsigned chan = to_channel(mattr);
 226         struct rank_info *rank = csrow->channels[chan];
 227
 228         /* if field has not been initialized, there is nothing to send */
 229         if (!rank->dimm->label[0])
 230                 return 0;
 231
 232         return snprintf(data, EDAC_MC_LABEL_LEN, "%s\n",
 233                         rank->dimm->label);
 234 }
 235
 236 static ssize_t channel_dimm_label_store(struct device *dev,
 237                                         struct device_attribute *mattr,
 238                                         const char *data, size_t count)
 239 {
 240         struct csrow_info *csrow = to_csrow(dev);
 241         unsigned chan = to_channel(mattr);
 242         struct rank_info *rank = csrow->channels[chan];
 243
 244         ssize_t max_size = 0;
 245
 246         max_size = min((ssize_t) count, (ssize_t) EDAC_MC_LABEL_LEN - 1);
 247         strncpy(rank->dimm->label, data, max_size);
 248         rank->dimm->label[max_size] = '\0';
 249
 250         return max_size;
 251 }
 252
 253 /* show function for dynamic chX_ce_count attribute */
 254 static ssize_t channel_ce_count_show(struct device *dev,
 255                                      struct device_attribute *mattr, char *data)
 256 {
 257         struct csrow_info *csrow = to_csrow(dev);
 258         unsigned chan = to_channel(mattr);
 259         struct rank_info *rank = csrow->channels[chan];
 260
 261         return sprintf(data, "%u\n", rank->ce_count);
 262 }
 263
 264 /* cwrow<id>/attribute files */
 265 DEVICE_ATTR_LEGACY(size_mb, S_IRUGO, csrow_size_show, NULL);
 266 DEVICE_ATTR_LEGACY(dev_type, S_IRUGO, csrow_dev_type_show, NULL);
 267 DEVICE_ATTR_LEGACY(mem_type, S_IRUGO, csrow_mem_type_show, NULL);
 268 DEVICE_ATTR_LEGACY(edac_mode, S_IRUGO, csrow_edac_mode_show, NULL);
 269 DEVICE_ATTR_LEGACY(ue_count, S_IRUGO, csrow_ue_count_show, NULL);
 270 DEVICE_ATTR_LEGACY(ce_count, S_IRUGO, csrow_ce_count_show, NULL);
 271
 272 /* default attributes of the CSROW<id> object */
 273 static struct attribute *csrow_attrs[] = {
 274         &dev_attr_legacy_dev_type.attr,
 275         &dev_attr_legacy_mem_type.attr,
 276         &dev_attr_legacy_edac_mode.attr,
 277         &dev_attr_legacy_size_mb.attr,
 278         &dev_attr_legacy_ue_count.attr,
 279         &dev_attr_legacy_ce_count.attr,
 280         NULL,
 281 };
 282
 283 static struct attribute_group csrow_attr_grp = {
 284         .attrs  = csrow_attrs,
 285 };
 286
 287 static const struct attribute_group *csrow_attr_groups[] = {
 288         &csrow_attr_grp,
 289         NULL
 290 };
 291
 292 static void csrow_attr_release(struct device *dev)
 293 {
 294         struct csrow_info *csrow = container_of(dev, struct csrow_info, dev);
 295
 296         edac_dbg(1, "Releasing csrow device %s\n", dev_name(dev));
 297         kfree(csrow);
 298 }
 299
 300 static struct device_type csrow_attr_type = {
 301         .groups         = csrow_attr_groups,
 302         .release        = csrow_attr_release,
 303 };
 304
 305 /*
 306  * possible dynamic channel DIMM Label attribute files
 307  *
 308  */
 309
 310 #define EDAC_NR_CHANNELS        6
 311
 312 DEVICE_CHANNEL(ch0_dimm_label, S_IRUGO | S_IWUSR,
 313         channel_dimm_label_show, channel_dimm_label_store, 0);
 314 DEVICE_CHANNEL(ch1_dimm_label, S_IRUGO | S_IWUSR,
 315         channel_dimm_label_show, channel_dimm_label_store, 1);
 316 DEVICE_CHANNEL(ch2_dimm_label, S_IRUGO | S_IWUSR,
 317         channel_dimm_label_show, channel_dimm_label_store, 2);
 318 DEVICE_CHANNEL(ch3_dimm_label, S_IRUGO | S_IWUSR,
 319         channel_dimm_label_show, channel_dimm_label_store, 3);
 320 DEVICE_CHANNEL(ch4_dimm_label, S_IRUGO | S_IWUSR,
 321         channel_dimm_label_show, channel_dimm_label_store, 4);
 322 DEVICE_CHANNEL(ch5_dimm_label, S_IRUGO | S_IWUSR,
 323         channel_dimm_label_show, channel_dimm_label_store, 5);
 324
 325 /* Total possible dynamic DIMM Label attribute file table */
 326 static struct attribute *dynamic_csrow_dimm_attr[] = {
 327         &dev_attr_legacy_ch0_dimm_label.attr.attr,
 328         &dev_attr_legacy_ch1_dimm_label.attr.attr,
 329         &dev_attr_legacy_ch2_dimm_label.attr.attr,
 330         &dev_attr_legacy_ch3_dimm_label.attr.attr,
 331         &dev_attr_legacy_ch4_dimm_label.attr.attr,
 332         &dev_attr_legacy_ch5_dimm_label.attr.attr,
 333         NULL
 334 };
 335
 336 /* possible dynamic channel ce_count attribute files */
 337 DEVICE_CHANNEL(ch0_ce_count, S_IRUGO,
 338                    channel_ce_count_show, NULL, 0);
 339 DEVICE_CHANNEL(ch1_ce_count, S_IRUGO,
 340                    channel_ce_count_show, NULL, 1);
 341 DEVICE_CHANNEL(ch2_ce_count, S_IRUGO,
 342                    channel_ce_count_show, NULL, 2);
 343 DEVICE_CHANNEL(ch3_ce_count, S_IRUGO,
 344                    channel_ce_count_show, NULL, 3);
 345 DEVICE_CHANNEL(ch4_ce_count, S_IRUGO,
 346                    channel_ce_count_show, NULL, 4);
 347 DEVICE_CHANNEL(ch5_ce_count, S_IRUGO,
 348                    channel_ce_count_show, NULL, 5);
 349
 350 /* Total possible dynamic ce_count attribute file table */
 351 static struct attribute *dynamic_csrow_ce_count_attr[] = {
 352         &dev_attr_legacy_ch0_ce_count.attr.attr,
 353         &dev_attr_legacy_ch1_ce_count.attr.attr,
 354         &dev_attr_legacy_ch2_ce_count.attr.attr,
 355         &dev_attr_legacy_ch3_ce_count.attr.attr,
 356         &dev_attr_legacy_ch4_ce_count.attr.attr,
 357         &dev_attr_legacy_ch5_ce_count.attr.attr,
 358         NULL
 359 };
 360
 361 static umode_t csrow_dev_is_visible(struct kobject *kobj,
 362                                     struct attribute *attr, int idx)
 363 {
 364         struct device *dev = kobj_to_dev(kobj);
 365         struct csrow_info *csrow = container_of(dev, struct csrow_info, dev);
 366
 367         if (idx >= csrow->nr_channels)
 368                 return 0;
 369         /* Only expose populated DIMMs */
 370         if (!csrow->channels[idx]->dimm->nr_pages)
 371                 return 0;
 372         return attr->mode;
 373 }
 374
 375
 376 static const struct attribute_group csrow_dev_dimm_group = {
 377         .attrs = dynamic_csrow_dimm_attr,
 378         .is_visible = csrow_dev_is_visible,
 379 };
 380
 381 static const struct attribute_group csrow_dev_ce_count_group = {
 382         .attrs = dynamic_csrow_ce_count_attr,
 383         .is_visible = csrow_dev_is_visible,
 384 };
 385
 386 static const struct attribute_group *csrow_dev_groups[] = {
 387         &csrow_dev_dimm_group,
 388         &csrow_dev_ce_count_group,
 389         NULL
 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         if (csrow->nr_channels > EDAC_NR_CHANNELS)
 407                 return -ENODEV;
 408
 409         csrow->dev.type = &csrow_attr_type;
 410         csrow->dev.bus = mci->bus;
 411         csrow->dev.groups = csrow_dev_groups;
 412         device_initialize(&csrow->dev);
 413         csrow->dev.parent = &mci->dev;
 414         csrow->mci = mci;
 415         dev_set_name(&csrow->dev, "csrow%d", index);
 416         dev_set_drvdata(&csrow->dev, csrow);
 417
 418         edac_dbg(0, "creating (virtual) csrow node %s\n",
 419                  dev_name(&csrow->dev));
 420
 421         return device_add(&csrow->dev);
 422 }
 423
 424 /* Create a CSROW object under specifed edac_mc_device */
 425 static int edac_create_csrow_objects(struct mem_ctl_info *mci)
 426 {
 427         int err, i;
 428         struct csrow_info *csrow;
 429
 430         for (i = 0; i < mci->nr_csrows; i++) {
 431                 csrow = mci->csrows[i];
 432                 if (!nr_pages_per_csrow(csrow))
 433                         continue;
 434                 err = edac_create_csrow_object(mci, mci->csrows[i], i);
 435                 if (err < 0) {
 436                         edac_dbg(1,
 437                                  "failure: create csrow objects for csrow %d\n",
 438                                  i);
 439                         goto error;
 440                 }
 441         }
 442         return 0;
 443
 444 error:
 445         for (--i; i >= 0; i--) {
 446                 csrow = mci->csrows[i];
 447                 if (!nr_pages_per_csrow(csrow))
 448                         continue;
 449                 put_device(&mci->csrows[i]->dev);
 450         }
 451
 452         return err;
 453 }
 454
 455 static void edac_delete_csrow_objects(struct mem_ctl_info *mci)
 456 {
 457         int i;
 458         struct csrow_info *csrow;
 459
 460         for (i = mci->nr_csrows - 1; i >= 0; i--) {
 461                 csrow = mci->csrows[i];
 462                 if (!nr_pages_per_csrow(csrow))
 463                         continue;
 464                 device_unregister(&mci->csrows[i]->dev);
 465         }
 466 }
 467 #endif
 468
 469 /*
 470  * Per-dimm (or per-rank) devices
 471  */
 472
 473 #define to_dimm(k) container_of(k, struct dimm_info, dev)
 474
 475 /* show/store functions for DIMM Label attributes */
 476 static ssize_t dimmdev_location_show(struct device *dev,
 477                                      struct device_attribute *mattr, char *data)
 478 {
 479         struct dimm_info *dimm = to_dimm(dev);
 480
 481         return edac_dimm_info_location(dimm, data, PAGE_SIZE);
 482 }
 483
 484 static ssize_t dimmdev_label_show(struct device *dev,
 485                                   struct device_attribute *mattr, char *data)
 486 {
 487         struct dimm_info *dimm = to_dimm(dev);
 488
 489         /* if field has not been initialized, there is nothing to send */
 490         if (!dimm->label[0])
 491                 return 0;
 492
 493         return snprintf(data, EDAC_MC_LABEL_LEN, "%s\n", dimm->label);
 494 }
 495
 496 static ssize_t dimmdev_label_store(struct device *dev,
 497                                    struct device_attribute *mattr,
 498                                    const char *data,
 499                                    size_t count)
 500 {
 501         struct dimm_info *dimm = to_dimm(dev);
 502
 503         ssize_t max_size = 0;
 504
 505         max_size = min((ssize_t) count, (ssize_t) EDAC_MC_LABEL_LEN - 1);
 506         strncpy(dimm->label, data, max_size);
 507         dimm->label[max_size] = '\0';
 508
 509         return max_size;
 510 }
 511
 512 static ssize_t dimmdev_size_show(struct device *dev,
 513                                  struct device_attribute *mattr, char *data)
 514 {
 515         struct dimm_info *dimm = to_dimm(dev);
 516
 517         return sprintf(data, "%u\n", PAGES_TO_MiB(dimm->nr_pages));
 518 }
 519
 520 static ssize_t dimmdev_mem_type_show(struct device *dev,
 521                                      struct device_attribute *mattr, char *data)
 522 {
 523         struct dimm_info *dimm = to_dimm(dev);
 524
 525         return sprintf(data, "%s\n", mem_types[dimm->mtype]);
 526 }
 527
 528 static ssize_t dimmdev_dev_type_show(struct device *dev,
 529                                      struct device_attribute *mattr, char *data)
 530 {
 531         struct dimm_info *dimm = to_dimm(dev);
 532
 533         return sprintf(data, "%s\n", dev_types[dimm->dtype]);
 534 }
 535
 536 static ssize_t dimmdev_edac_mode_show(struct device *dev,
 537                                       struct device_attribute *mattr,
 538                                       char *data)
 539 {
 540         struct dimm_info *dimm = to_dimm(dev);
 541
 542         return sprintf(data, "%s\n", edac_caps[dimm->edac_mode]);
 543 }
 544
 545 /* dimm/rank attribute files */
 546 static DEVICE_ATTR(dimm_label, S_IRUGO | S_IWUSR,
 547                    dimmdev_label_show, dimmdev_label_store);
 548 static DEVICE_ATTR(dimm_location, S_IRUGO, dimmdev_location_show, NULL);
 549 static DEVICE_ATTR(size, S_IRUGO, dimmdev_size_show, NULL);
 550 static DEVICE_ATTR(dimm_mem_type, S_IRUGO, dimmdev_mem_type_show, NULL);
 551 static DEVICE_ATTR(dimm_dev_type, S_IRUGO, dimmdev_dev_type_show, NULL);
 552 static DEVICE_ATTR(dimm_edac_mode, S_IRUGO, dimmdev_edac_mode_show, NULL);
 553
 554 /* attributes of the dimm<id>/rank<id> object */
 555 static struct attribute *dimm_attrs[] = {
 556         &dev_attr_dimm_label.attr,
 557         &dev_attr_dimm_location.attr,
 558         &dev_attr_size.attr,
 559         &dev_attr_dimm_mem_type.attr,
 560         &dev_attr_dimm_dev_type.attr,
 561         &dev_attr_dimm_edac_mode.attr,
 562         NULL,
 563 };
 564
 565 static struct attribute_group dimm_attr_grp = {
 566         .attrs  = dimm_attrs,
 567 };
 568
 569 static const struct attribute_group *dimm_attr_groups[] = {
 570         &dimm_attr_grp,
 571         NULL
 572 };
 573
 574 static void dimm_attr_release(struct device *dev)
 575 {
 576         struct dimm_info *dimm = container_of(dev, struct dimm_info, dev);
 577
 578         edac_dbg(1, "Releasing dimm device %s\n", dev_name(dev));
 579         kfree(dimm);
 580 }
 581
 582 static struct device_type dimm_attr_type = {
 583         .groups         = dimm_attr_groups,
 584         .release        = dimm_attr_release,
 585 };
 586
 587 /* Create a DIMM object under specifed memory controller device */
 588 static int edac_create_dimm_object(struct mem_ctl_info *mci,
 589                                    struct dimm_info *dimm,
 590                                    int index)
 591 {
 592         int err;
 593         dimm->mci = mci;
 594
 595         dimm->dev.type = &dimm_attr_type;
 596         dimm->dev.bus = mci->bus;
 597         device_initialize(&dimm->dev);
 598
 599         dimm->dev.parent = &mci->dev;
 600         if (mci->csbased)
 601                 dev_set_name(&dimm->dev, "rank%d", index);
 602         else
 603                 dev_set_name(&dimm->dev, "dimm%d", index);
 604         dev_set_drvdata(&dimm->dev, dimm);
 605         pm_runtime_forbid(&mci->dev);
 606
 607         err =  device_add(&dimm->dev);
 608
 609         edac_dbg(0, "creating rank/dimm device %s\n", dev_name(&dimm->dev));
 610
 611         return err;
 612 }
 613
 614 /*
 615  * Memory controller device
 616  */
 617
 618 #define to_mci(k) container_of(k, struct mem_ctl_info, dev)
 619
 620 static ssize_t mci_reset_counters_store(struct device *dev,
 621                                         struct device_attribute *mattr,
 622                                         const char *data, size_t count)
 623 {
 624         struct mem_ctl_info *mci = to_mci(dev);
 625         int cnt, row, chan, i;
 626         mci->ue_mc = 0;
 627         mci->ce_mc = 0;
 628         mci->ue_noinfo_count = 0;
 629         mci->ce_noinfo_count = 0;
 630
 631         for (row = 0; row < mci->nr_csrows; row++) {
 632                 struct csrow_info *ri = mci->csrows[row];
 633
 634                 ri->ue_count = 0;
 635                 ri->ce_count = 0;
 636
 637                 for (chan = 0; chan < ri->nr_channels; chan++)
 638                         ri->channels[chan]->ce_count = 0;
 639         }
 640
 641         cnt = 1;
 642         for (i = 0; i < mci->n_layers; i++) {
 643                 cnt *= mci->layers[i].size;
 644                 memset(mci->ce_per_layer[i], 0, cnt * sizeof(u32));
 645                 memset(mci->ue_per_layer[i], 0, cnt * sizeof(u32));
 646         }
 647
 648         mci->start_time = jiffies;
 649         return count;
 650 }
 651
 652 /* Memory scrubbing interface:
 653  *
 654  * A MC driver can limit the scrubbing bandwidth based on the CPU type.
 655  * Therefore, ->set_sdram_scrub_rate should be made to return the actual
 656  * bandwidth that is accepted or 0 when scrubbing is to be disabled.
 657  *
 658  * Negative value still means that an error has occurred while setting
 659  * the scrub rate.
 660  */
 661 static ssize_t mci_sdram_scrub_rate_store(struct device *dev,
 662                                           struct device_attribute *mattr,
 663                                           const char *data, size_t count)
 664 {
 665         struct mem_ctl_info *mci = to_mci(dev);
 666         unsigned long bandwidth = 0;
 667         int new_bw = 0;
 668
 669         if (kstrtoul(data, 10, &bandwidth) < 0)
 670                 return -EINVAL;
 671
 672         new_bw = mci->set_sdram_scrub_rate(mci, bandwidth);
 673         if (new_bw < 0) {
 674                 edac_printk(KERN_WARNING, EDAC_MC,
 675                             "Error setting scrub rate to: %lu\n", bandwidth);
 676                 return -EINVAL;
 677         }
 678
 679         return count;
 680 }
 681
 682 /*
 683  * ->get_sdram_scrub_rate() return value semantics same as above.
 684  */
 685 static ssize_t mci_sdram_scrub_rate_show(struct device *dev,
 686                                          struct device_attribute *mattr,
 687                                          char *data)
 688 {
 689         struct mem_ctl_info *mci = to_mci(dev);
 690         int bandwidth = 0;
 691
 692         bandwidth = mci->get_sdram_scrub_rate(mci);
 693         if (bandwidth < 0) {
 694                 edac_printk(KERN_DEBUG, EDAC_MC, "Error reading scrub rate\n");
 695                 return bandwidth;
 696         }
 697
 698         return sprintf(data, "%d\n", bandwidth);
 699 }
 700
 701 /* default attribute files for the MCI object */
 702 static ssize_t mci_ue_count_show(struct device *dev,
 703                                  struct device_attribute *mattr,
 704                                  char *data)
 705 {
 706         struct mem_ctl_info *mci = to_mci(dev);
 707
 708         return sprintf(data, "%d\n", mci->ue_mc);
 709 }
 710
 711 static ssize_t mci_ce_count_show(struct device *dev,
 712                                  struct device_attribute *mattr,
 713                                  char *data)
 714 {
 715         struct mem_ctl_info *mci = to_mci(dev);
 716
 717         return sprintf(data, "%d\n", mci->ce_mc);
 718 }
 719
 720 static ssize_t mci_ce_noinfo_show(struct device *dev,
 721                                   struct device_attribute *mattr,
 722                                   char *data)
 723 {
 724         struct mem_ctl_info *mci = to_mci(dev);
 725
 726         return sprintf(data, "%d\n", mci->ce_noinfo_count);
 727 }
 728
 729 static ssize_t mci_ue_noinfo_show(struct device *dev,
 730                                   struct device_attribute *mattr,
 731                                   char *data)
 732 {
 733         struct mem_ctl_info *mci = to_mci(dev);
 734
 735         return sprintf(data, "%d\n", mci->ue_noinfo_count);
 736 }
 737
 738 static ssize_t mci_seconds_show(struct device *dev,
 739                                 struct device_attribute *mattr,
 740                                 char *data)
 741 {
 742         struct mem_ctl_info *mci = to_mci(dev);
 743
 744         return sprintf(data, "%ld\n", (jiffies - mci->start_time) / HZ);
 745 }
 746
 747 static ssize_t mci_ctl_name_show(struct device *dev,
 748                                  struct device_attribute *mattr,
 749                                  char *data)
 750 {
 751         struct mem_ctl_info *mci = to_mci(dev);
 752
 753         return sprintf(data, "%s\n", mci->ctl_name);
 754 }
 755
 756 static ssize_t mci_size_mb_show(struct device *dev,
 757                                 struct device_attribute *mattr,
 758                                 char *data)
 759 {
 760         struct mem_ctl_info *mci = to_mci(dev);
 761         int total_pages = 0, csrow_idx, j;
 762
 763         for (csrow_idx = 0; csrow_idx < mci->nr_csrows; csrow_idx++) {
 764                 struct csrow_info *csrow = mci->csrows[csrow_idx];
 765
 766                 for (j = 0; j < csrow->nr_channels; j++) {
 767                         struct dimm_info *dimm = csrow->channels[j]->dimm;
 768
 769                         total_pages += dimm->nr_pages;
 770                 }
 771         }
 772
 773         return sprintf(data, "%u\n", PAGES_TO_MiB(total_pages));
 774 }
 775
 776 static ssize_t mci_max_location_show(struct device *dev,
 777                                      struct device_attribute *mattr,
 778                                      char *data)
 779 {
 780         struct mem_ctl_info *mci = to_mci(dev);
 781         int i;
 782         char *p = data;
 783
 784         for (i = 0; i < mci->n_layers; i++) {
 785                 p += sprintf(p, "%s %d ",
 786                              edac_layer_name[mci->layers[i].type],
 787                              mci->layers[i].size - 1);
 788         }
 789
 790         return p - data;
 791 }
 792
 793 #ifdef CONFIG_EDAC_DEBUG
 794 static ssize_t edac_fake_inject_write(struct file *file,
 795                                       const char __user *data,
 796                                       size_t count, loff_t *ppos)
 797 {
 798         struct device *dev = file->private_data;
 799         struct mem_ctl_info *mci = to_mci(dev);
 800         static enum hw_event_mc_err_type type;
 801         u16 errcount = mci->fake_inject_count;
 802
 803         if (!errcount)
 804                 errcount = 1;
 805
 806         type = mci->fake_inject_ue ? HW_EVENT_ERR_UNCORRECTED
 807                                    : HW_EVENT_ERR_CORRECTED;
 808
 809         printk(KERN_DEBUG
 810                "Generating %d %s fake error%s to %d.%d.%d to test core handling. NOTE: this won't test the driver-specific decoding logic.\n",
 811                 errcount,
 812                 (type == HW_EVENT_ERR_UNCORRECTED) ? "UE" : "CE",
 813                 errcount > 1 ? "s" : "",
 814                 mci->fake_inject_layer[0],
 815                 mci->fake_inject_layer[1],
 816                 mci->fake_inject_layer[2]
 817                );
 818         edac_mc_handle_error(type, mci, errcount, 0, 0, 0,
 819                              mci->fake_inject_layer[0],
 820                              mci->fake_inject_layer[1],
 821                              mci->fake_inject_layer[2],
 822                              "FAKE ERROR", "for EDAC testing only");
 823
 824         return count;
 825 }
 826
 827 static const struct file_operations debug_fake_inject_fops = {
 828         .open = simple_open,
 829         .write = edac_fake_inject_write,
 830         .llseek = generic_file_llseek,
 831 };
 832 #endif
 833
 834 /* default Control file */
 835 static DEVICE_ATTR(reset_counters, S_IWUSR, NULL, mci_reset_counters_store);
 836
 837 /* default Attribute files */
 838 static DEVICE_ATTR(mc_name, S_IRUGO, mci_ctl_name_show, NULL);
 839 static DEVICE_ATTR(size_mb, S_IRUGO, mci_size_mb_show, NULL);
 840 static DEVICE_ATTR(seconds_since_reset, S_IRUGO, mci_seconds_show, NULL);
 841 static DEVICE_ATTR(ue_noinfo_count, S_IRUGO, mci_ue_noinfo_show, NULL);
 842 static DEVICE_ATTR(ce_noinfo_count, S_IRUGO, mci_ce_noinfo_show, NULL);
 843 static DEVICE_ATTR(ue_count, S_IRUGO, mci_ue_count_show, NULL);
 844 static DEVICE_ATTR(ce_count, S_IRUGO, mci_ce_count_show, NULL);
 845 static DEVICE_ATTR(max_location, S_IRUGO, mci_max_location_show, NULL);
 846
 847 /* memory scrubber attribute file */
 848 DEVICE_ATTR(sdram_scrub_rate, 0, mci_sdram_scrub_rate_show,
 849             mci_sdram_scrub_rate_store); /* umode set later in is_visible */
 850
 851 static struct attribute *mci_attrs[] = {
 852         &dev_attr_reset_counters.attr,
 853         &dev_attr_mc_name.attr,
 854         &dev_attr_size_mb.attr,
 855         &dev_attr_seconds_since_reset.attr,
 856         &dev_attr_ue_noinfo_count.attr,
 857         &dev_attr_ce_noinfo_count.attr,
 858         &dev_attr_ue_count.attr,
 859         &dev_attr_ce_count.attr,
 860         &dev_attr_max_location.attr,
 861         &dev_attr_sdram_scrub_rate.attr,
 862         NULL
 863 };
 864
 865 static umode_t mci_attr_is_visible(struct kobject *kobj,
 866                                    struct attribute *attr, int idx)
 867 {
 868         struct device *dev = kobj_to_dev(kobj);
 869         struct mem_ctl_info *mci = to_mci(dev);
 870         umode_t mode = 0;
 871
 872         if (attr != &dev_attr_sdram_scrub_rate.attr)
 873                 return attr->mode;
 874         if (mci->get_sdram_scrub_rate)
 875                 mode |= S_IRUGO;
 876         if (mci->set_sdram_scrub_rate)
 877                 mode |= S_IWUSR;
 878         return mode;
 879 }
 880
 881 static struct attribute_group mci_attr_grp = {
 882         .attrs  = mci_attrs,
 883         .is_visible = mci_attr_is_visible,
 884 };
 885
 886 static const struct attribute_group *mci_attr_groups[] = {
 887         &mci_attr_grp,
 888         NULL
 889 };
 890
 891 static void mci_attr_release(struct device *dev)
 892 {
 893         struct mem_ctl_info *mci = container_of(dev, struct mem_ctl_info, dev);
 894
 895         edac_dbg(1, "Releasing csrow device %s\n", dev_name(dev));
 896         kfree(mci);
 897 }
 898
 899 static struct device_type mci_attr_type = {
 900         .groups         = mci_attr_groups,
 901         .release        = mci_attr_release,
 902 };
 903
 904 #ifdef CONFIG_EDAC_DEBUG
 905 static struct dentry *edac_debugfs;
 906
 907 int __init edac_debugfs_init(void)
 908 {
 909         edac_debugfs = debugfs_create_dir("edac", NULL);
 910         if (IS_ERR(edac_debugfs)) {
 911                 edac_debugfs = NULL;
 912                 return -ENOMEM;
 913         }
 914         return 0;
 915 }
 916
 917 void edac_debugfs_exit(void)
 918 {
 919         debugfs_remove(edac_debugfs);
 920 }
 921
 922 static int edac_create_debug_nodes(struct mem_ctl_info *mci)
 923 {
 924         struct dentry *d, *parent;
 925         char name[80];
 926         int i;
 927
 928         if (!edac_debugfs)
 929                 return -ENODEV;
 930
 931         d = debugfs_create_dir(mci->dev.kobj.name, edac_debugfs);
 932         if (!d)
 933                 return -ENOMEM;
 934         parent = d;
 935
 936         for (i = 0; i < mci->n_layers; i++) {
 937                 sprintf(name, "fake_inject_%s",
 938                              edac_layer_name[mci->layers[i].type]);
 939                 d = debugfs_create_u8(name, S_IRUGO | S_IWUSR, parent,
 940                                       &mci->fake_inject_layer[i]);
 941                 if (!d)
 942                         goto nomem;
 943         }
 944
 945         d = debugfs_create_bool("fake_inject_ue", S_IRUGO | S_IWUSR, parent,
 946                                 &mci->fake_inject_ue);
 947         if (!d)
 948                 goto nomem;
 949
 950         d = debugfs_create_u16("fake_inject_count", S_IRUGO | S_IWUSR, parent,
 951                                 &mci->fake_inject_count);
 952         if (!d)
 953                 goto nomem;
 954
 955         d = debugfs_create_file("fake_inject", S_IWUSR, parent,
 956                                 &mci->dev,
 957                                 &debug_fake_inject_fops);
 958         if (!d)
 959                 goto nomem;
 960
 961         mci->debugfs = parent;
 962         return 0;
 963 nomem:
 964         debugfs_remove(mci->debugfs);
 965         return -ENOMEM;
 966 }
 967 #endif
 968
 969 /*
 970  * Create a new Memory Controller kobject instance,
 971  *      mc<id> under the 'mc' directory
 972  *
 973  * Return:
 974  *      0       Success
 975  *      !0      Failure
 976  */
 977 int edac_create_sysfs_mci_device(struct mem_ctl_info *mci,
 978                                  const struct attribute_group **groups)
 979 {
 980         int i, err;
 981
 982         /*
 983          * The memory controller needs its own bus, in order to avoid
 984          * namespace conflicts at /sys/bus/edac.
 985          */
 986         mci->bus->name = kasprintf(GFP_KERNEL, "mc%d", mci->mc_idx);
 987         if (!mci->bus->name)
 988                 return -ENOMEM;
 989
 990         edac_dbg(0, "creating bus %s\n", mci->bus->name);
 991
 992         err = bus_register(mci->bus);
 993         if (err < 0)
 994                 goto fail_free_name;
 995
 996         /* get the /sys/devices/system/edac subsys reference */
 997         mci->dev.type = &mci_attr_type;
 998         device_initialize(&mci->dev);
 999
1000         mci->dev.parent = mci_pdev;
1001         mci->dev.bus = mci->bus;
1002         mci->dev.groups = groups;
1003         dev_set_name(&mci->dev, "mc%d", mci->mc_idx);
1004         dev_set_drvdata(&mci->dev, mci);
1005         pm_runtime_forbid(&mci->dev);
1006
1007         edac_dbg(0, "creating device %s\n", dev_name(&mci->dev));
1008         err = device_add(&mci->dev);
1009         if (err < 0) {
1010                 edac_dbg(1, "failure: create device %s\n", dev_name(&mci->dev));
1011                 goto fail_unregister_bus;
1012         }
1013
1014         /*
1015          * Create the dimm/rank devices
1016          */
1017         for (i = 0; i < mci->tot_dimms; i++) {
1018                 struct dimm_info *dimm = mci->dimms[i];
1019                 /* Only expose populated DIMMs */
1020                 if (!dimm->nr_pages)
1021                         continue;
1022
1023 #ifdef CONFIG_EDAC_DEBUG
1024                 edac_dbg(1, "creating dimm%d, located at ", i);
1025                 if (edac_debug_level >= 1) {
1026                         int lay;
1027                         for (lay = 0; lay < mci->n_layers; lay++)
1028                                 printk(KERN_CONT "%s %d ",
1029                                         edac_layer_name[mci->layers[lay].type],
1030                                         dimm->location[lay]);
1031                         printk(KERN_CONT "\n");
1032                 }
1033 #endif
1034                 err = edac_create_dimm_object(mci, dimm, i);
1035                 if (err) {
1036                         edac_dbg(1, "failure: create dimm %d obj\n", i);
1037                         goto fail_unregister_dimm;
1038                 }
1039         }
1040
1041 #ifdef CONFIG_EDAC_LEGACY_SYSFS
1042         err = edac_create_csrow_objects(mci);
1043         if (err < 0)
1044                 goto fail_unregister_dimm;
1045 #endif
1046
1047 #ifdef CONFIG_EDAC_DEBUG
1048         edac_create_debug_nodes(mci);
1049 #endif
1050         return 0;
1051
1052 fail_unregister_dimm:
1053         for (i--; i >= 0; i--) {
1054                 struct dimm_info *dimm = mci->dimms[i];
1055                 if (!dimm->nr_pages)
1056                         continue;
1057
1058                 device_unregister(&dimm->dev);
1059         }
1060         device_unregister(&mci->dev);
1061 fail_unregister_bus:
1062         bus_unregister(mci->bus);
1063 fail_free_name:
1064         kfree(mci->bus->name);
1065         return err;
1066 }
1067
1068 /*
1069  * remove a Memory Controller instance
1070  */
1071 void edac_remove_sysfs_mci_device(struct mem_ctl_info *mci)
1072 {
1073         int i;
1074
1075         edac_dbg(0, "\n");
1076
1077 #ifdef CONFIG_EDAC_DEBUG
1078         debugfs_remove(mci->debugfs);
1079 #endif
1080 #ifdef CONFIG_EDAC_LEGACY_SYSFS
1081         edac_delete_csrow_objects(mci);
1082 #endif
1083
1084         for (i = 0; i < mci->tot_dimms; i++) {
1085                 struct dimm_info *dimm = mci->dimms[i];
1086                 if (dimm->nr_pages == 0)
1087                         continue;
1088                 edac_dbg(0, "removing device %s\n", dev_name(&dimm->dev));
1089                 device_unregister(&dimm->dev);
1090         }
1091 }
1092
1093 void edac_unregister_sysfs(struct mem_ctl_info *mci)
1094 {
1095         edac_dbg(1, "Unregistering device %s\n", dev_name(&mci->dev));
1096         device_unregister(&mci->dev);
1097         bus_unregister(mci->bus);
1098         kfree(mci->bus->name);
1099 }
1100
1101 static void mc_attr_release(struct device *dev)
1102 {
1103         /*
1104          * There's no container structure here, as this is just the mci
1105          * parent device, used to create the /sys/devices/mc sysfs node.
1106          * So, there are no attributes on it.
1107          */
1108         edac_dbg(1, "Releasing device %s\n", dev_name(dev));
1109         kfree(dev);
1110 }
1111
1112 static struct device_type mc_attr_type = {
1113         .release        = mc_attr_release,
1114 };
1115 /*
1116  * Init/exit code for the module. Basically, creates/removes /sys/class/rc
1117  */
1118 int __init edac_mc_sysfs_init(void)
1119 {
1120         struct bus_type *edac_subsys;
1121         int err;
1122
1123         /* get the /sys/devices/system/edac subsys reference */
1124         edac_subsys = edac_get_sysfs_subsys();
1125         if (edac_subsys == NULL) {
1126                 edac_dbg(1, "no edac_subsys\n");
1127                 err = -EINVAL;
1128                 goto out;
1129         }
1130
1131         mci_pdev = kzalloc(sizeof(*mci_pdev), GFP_KERNEL);
1132         if (!mci_pdev) {
1133                 err = -ENOMEM;
1134                 goto out_put_sysfs;
1135         }
1136
1137         mci_pdev->bus = edac_subsys;
1138         mci_pdev->type = &mc_attr_type;
1139         device_initialize(mci_pdev);
1140         dev_set_name(mci_pdev, "mc");
1141
1142         err = device_add(mci_pdev);
1143         if (err < 0)
1144                 goto out_dev_free;
1145
1146         edac_dbg(0, "device %s created\n", dev_name(mci_pdev));
1147
1148         return 0;
1149
1150  out_dev_free:
1151         kfree(mci_pdev);
1152  out_put_sysfs:
1153         edac_put_sysfs_subsys();
1154  out:
1155         return err;
1156 }
1157
1158 void edac_mc_sysfs_exit(void)
1159 {
1160         device_unregister(mci_pdev);
1161         edac_put_sysfs_subsys();
1162 }