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 DEVICE_CHANNEL(ch0_dimm_label, S_IRUGO | S_IWUSR,
 311         channel_dimm_label_show, channel_dimm_label_store, 0);
 312 DEVICE_CHANNEL(ch1_dimm_label, S_IRUGO | S_IWUSR,
 313         channel_dimm_label_show, channel_dimm_label_store, 1);
 314 DEVICE_CHANNEL(ch2_dimm_label, S_IRUGO | S_IWUSR,
 315         channel_dimm_label_show, channel_dimm_label_store, 2);
 316 DEVICE_CHANNEL(ch3_dimm_label, S_IRUGO | S_IWUSR,
 317         channel_dimm_label_show, channel_dimm_label_store, 3);
 318 DEVICE_CHANNEL(ch4_dimm_label, S_IRUGO | S_IWUSR,
 319         channel_dimm_label_show, channel_dimm_label_store, 4);
 320 DEVICE_CHANNEL(ch5_dimm_label, S_IRUGO | S_IWUSR,
 321         channel_dimm_label_show, channel_dimm_label_store, 5);
 322
 323 /* Total possible dynamic DIMM Label attribute file table */
 324 static struct attribute *dynamic_csrow_dimm_attr[] = {
 325         &dev_attr_legacy_ch0_dimm_label.attr.attr,
 326         &dev_attr_legacy_ch1_dimm_label.attr.attr,
 327         &dev_attr_legacy_ch2_dimm_label.attr.attr,
 328         &dev_attr_legacy_ch3_dimm_label.attr.attr,
 329         &dev_attr_legacy_ch4_dimm_label.attr.attr,
 330         &dev_attr_legacy_ch5_dimm_label.attr.attr,
 331         NULL
 332 };
 333
 334 /* possible dynamic channel ce_count attribute files */
 335 DEVICE_CHANNEL(ch0_ce_count, S_IRUGO,
 336                    channel_ce_count_show, NULL, 0);
 337 DEVICE_CHANNEL(ch1_ce_count, S_IRUGO,
 338                    channel_ce_count_show, NULL, 1);
 339 DEVICE_CHANNEL(ch2_ce_count, S_IRUGO,
 340                    channel_ce_count_show, NULL, 2);
 341 DEVICE_CHANNEL(ch3_ce_count, S_IRUGO,
 342                    channel_ce_count_show, NULL, 3);
 343 DEVICE_CHANNEL(ch4_ce_count, S_IRUGO,
 344                    channel_ce_count_show, NULL, 4);
 345 DEVICE_CHANNEL(ch5_ce_count, S_IRUGO,
 346                    channel_ce_count_show, NULL, 5);
 347
 348 /* Total possible dynamic ce_count attribute file table */
 349 static struct attribute *dynamic_csrow_ce_count_attr[] = {
 350         &dev_attr_legacy_ch0_ce_count.attr.attr,
 351         &dev_attr_legacy_ch1_ce_count.attr.attr,
 352         &dev_attr_legacy_ch2_ce_count.attr.attr,
 353         &dev_attr_legacy_ch3_ce_count.attr.attr,
 354         &dev_attr_legacy_ch4_ce_count.attr.attr,
 355         &dev_attr_legacy_ch5_ce_count.attr.attr,
 356         NULL
 357 };
 358
 359 static umode_t csrow_dev_is_visible(struct kobject *kobj,
 360                                     struct attribute *attr, int idx)
 361 {
 362         struct device *dev = kobj_to_dev(kobj);
 363         struct csrow_info *csrow = container_of(dev, struct csrow_info, dev);
 364
 365         if (idx >= csrow->nr_channels)
 366                 return 0;
 367         /* Only expose populated DIMMs */
 368         if (!csrow->channels[idx]->dimm->nr_pages)
 369                 return 0;
 370         return attr->mode;
 371 }
 372
 373
 374 static const struct attribute_group csrow_dev_dimm_group = {
 375         .attrs = dynamic_csrow_dimm_attr,
 376         .is_visible = csrow_dev_is_visible,
 377 };
 378
 379 static const struct attribute_group csrow_dev_ce_count_group = {
 380         .attrs = dynamic_csrow_ce_count_attr,
 381         .is_visible = csrow_dev_is_visible,
 382 };
 383
 384 static const struct attribute_group *csrow_dev_groups[] = {
 385         &csrow_dev_dimm_group,
 386         &csrow_dev_ce_count_group,
 387         NULL
 388 };
 389
 390 static inline int nr_pages_per_csrow(struct csrow_info *csrow)
 391 {
 392         int chan, nr_pages = 0;
 393
 394         for (chan = 0; chan < csrow->nr_channels; chan++)
 395                 nr_pages += csrow->channels[chan]->dimm->nr_pages;
 396
 397         return nr_pages;
 398 }
 399
 400 /* Create a CSROW object under specifed edac_mc_device */
 401 static int edac_create_csrow_object(struct mem_ctl_info *mci,
 402                                     struct csrow_info *csrow, int index)
 403 {
 404         csrow->dev.type = &csrow_attr_type;
 405         csrow->dev.bus = mci->bus;
 406         csrow->dev.groups = csrow_dev_groups;
 407         device_initialize(&csrow->dev);
 408         csrow->dev.parent = &mci->dev;
 409         csrow->mci = mci;
 410         dev_set_name(&csrow->dev, "csrow%d", index);
 411         dev_set_drvdata(&csrow->dev, csrow);
 412
 413         edac_dbg(0, "creating (virtual) csrow node %s\n",
 414                  dev_name(&csrow->dev));
 415
 416         return device_add(&csrow->dev);
 417 }
 418
 419 /* Create a CSROW object under specifed edac_mc_device */
 420 static int edac_create_csrow_objects(struct mem_ctl_info *mci)
 421 {
 422         int err, i;
 423         struct csrow_info *csrow;
 424
 425         for (i = 0; i < mci->nr_csrows; i++) {
 426                 csrow = mci->csrows[i];
 427                 if (!nr_pages_per_csrow(csrow))
 428                         continue;
 429                 err = edac_create_csrow_object(mci, mci->csrows[i], i);
 430                 if (err < 0) {
 431                         edac_dbg(1,
 432                                  "failure: create csrow objects for csrow %d\n",
 433                                  i);
 434                         goto error;
 435                 }
 436         }
 437         return 0;
 438
 439 error:
 440         for (--i; i >= 0; i--) {
 441                 csrow = mci->csrows[i];
 442                 if (!nr_pages_per_csrow(csrow))
 443                         continue;
 444                 put_device(&mci->csrows[i]->dev);
 445         }
 446
 447         return err;
 448 }
 449
 450 static void edac_delete_csrow_objects(struct mem_ctl_info *mci)
 451 {
 452         int i;
 453         struct csrow_info *csrow;
 454
 455         for (i = mci->nr_csrows - 1; i >= 0; i--) {
 456                 csrow = mci->csrows[i];
 457                 if (!nr_pages_per_csrow(csrow))
 458                         continue;
 459                 device_unregister(&mci->csrows[i]->dev);
 460         }
 461 }
 462 #endif
 463
 464 /*
 465  * Per-dimm (or per-rank) devices
 466  */
 467
 468 #define to_dimm(k) container_of(k, struct dimm_info, dev)
 469
 470 /* show/store functions for DIMM Label attributes */
 471 static ssize_t dimmdev_location_show(struct device *dev,
 472                                      struct device_attribute *mattr, char *data)
 473 {
 474         struct dimm_info *dimm = to_dimm(dev);
 475
 476         return edac_dimm_info_location(dimm, data, PAGE_SIZE);
 477 }
 478
 479 static ssize_t dimmdev_label_show(struct device *dev,
 480                                   struct device_attribute *mattr, char *data)
 481 {
 482         struct dimm_info *dimm = to_dimm(dev);
 483
 484         /* if field has not been initialized, there is nothing to send */
 485         if (!dimm->label[0])
 486                 return 0;
 487
 488         return snprintf(data, EDAC_MC_LABEL_LEN, "%s\n", dimm->label);
 489 }
 490
 491 static ssize_t dimmdev_label_store(struct device *dev,
 492                                    struct device_attribute *mattr,
 493                                    const char *data,
 494                                    size_t count)
 495 {
 496         struct dimm_info *dimm = to_dimm(dev);
 497
 498         ssize_t max_size = 0;
 499
 500         max_size = min((ssize_t) count, (ssize_t) EDAC_MC_LABEL_LEN - 1);
 501         strncpy(dimm->label, data, max_size);
 502         dimm->label[max_size] = '\0';
 503
 504         return max_size;
 505 }
 506
 507 static ssize_t dimmdev_size_show(struct device *dev,
 508                                  struct device_attribute *mattr, char *data)
 509 {
 510         struct dimm_info *dimm = to_dimm(dev);
 511
 512         return sprintf(data, "%u\n", PAGES_TO_MiB(dimm->nr_pages));
 513 }
 514
 515 static ssize_t dimmdev_mem_type_show(struct device *dev,
 516                                      struct device_attribute *mattr, char *data)
 517 {
 518         struct dimm_info *dimm = to_dimm(dev);
 519
 520         return sprintf(data, "%s\n", mem_types[dimm->mtype]);
 521 }
 522
 523 static ssize_t dimmdev_dev_type_show(struct device *dev,
 524                                      struct device_attribute *mattr, char *data)
 525 {
 526         struct dimm_info *dimm = to_dimm(dev);
 527
 528         return sprintf(data, "%s\n", dev_types[dimm->dtype]);
 529 }
 530
 531 static ssize_t dimmdev_edac_mode_show(struct device *dev,
 532                                       struct device_attribute *mattr,
 533                                       char *data)
 534 {
 535         struct dimm_info *dimm = to_dimm(dev);
 536
 537         return sprintf(data, "%s\n", edac_caps[dimm->edac_mode]);
 538 }
 539
 540 /* dimm/rank attribute files */
 541 static DEVICE_ATTR(dimm_label, S_IRUGO | S_IWUSR,
 542                    dimmdev_label_show, dimmdev_label_store);
 543 static DEVICE_ATTR(dimm_location, S_IRUGO, dimmdev_location_show, NULL);
 544 static DEVICE_ATTR(size, S_IRUGO, dimmdev_size_show, NULL);
 545 static DEVICE_ATTR(dimm_mem_type, S_IRUGO, dimmdev_mem_type_show, NULL);
 546 static DEVICE_ATTR(dimm_dev_type, S_IRUGO, dimmdev_dev_type_show, NULL);
 547 static DEVICE_ATTR(dimm_edac_mode, S_IRUGO, dimmdev_edac_mode_show, NULL);
 548
 549 /* attributes of the dimm<id>/rank<id> object */
 550 static struct attribute *dimm_attrs[] = {
 551         &dev_attr_dimm_label.attr,
 552         &dev_attr_dimm_location.attr,
 553         &dev_attr_size.attr,
 554         &dev_attr_dimm_mem_type.attr,
 555         &dev_attr_dimm_dev_type.attr,
 556         &dev_attr_dimm_edac_mode.attr,
 557         NULL,
 558 };
 559
 560 static struct attribute_group dimm_attr_grp = {
 561         .attrs  = dimm_attrs,
 562 };
 563
 564 static const struct attribute_group *dimm_attr_groups[] = {
 565         &dimm_attr_grp,
 566         NULL
 567 };
 568
 569 static void dimm_attr_release(struct device *dev)
 570 {
 571         struct dimm_info *dimm = container_of(dev, struct dimm_info, dev);
 572
 573         edac_dbg(1, "Releasing dimm device %s\n", dev_name(dev));
 574         kfree(dimm);
 575 }
 576
 577 static struct device_type dimm_attr_type = {
 578         .groups         = dimm_attr_groups,
 579         .release        = dimm_attr_release,
 580 };
 581
 582 /* Create a DIMM object under specifed memory controller device */
 583 static int edac_create_dimm_object(struct mem_ctl_info *mci,
 584                                    struct dimm_info *dimm,
 585                                    int index)
 586 {
 587         int err;
 588         dimm->mci = mci;
 589
 590         dimm->dev.type = &dimm_attr_type;
 591         dimm->dev.bus = mci->bus;
 592         device_initialize(&dimm->dev);
 593
 594         dimm->dev.parent = &mci->dev;
 595         if (mci->csbased)
 596                 dev_set_name(&dimm->dev, "rank%d", index);
 597         else
 598                 dev_set_name(&dimm->dev, "dimm%d", index);
 599         dev_set_drvdata(&dimm->dev, dimm);
 600         pm_runtime_forbid(&mci->dev);
 601
 602         err =  device_add(&dimm->dev);
 603
 604         edac_dbg(0, "creating rank/dimm device %s\n", dev_name(&dimm->dev));
 605
 606         return err;
 607 }
 608
 609 /*
 610  * Memory controller device
 611  */
 612
 613 #define to_mci(k) container_of(k, struct mem_ctl_info, dev)
 614
 615 static ssize_t mci_reset_counters_store(struct device *dev,
 616                                         struct device_attribute *mattr,
 617                                         const char *data, size_t count)
 618 {
 619         struct mem_ctl_info *mci = to_mci(dev);
 620         int cnt, row, chan, i;
 621         mci->ue_mc = 0;
 622         mci->ce_mc = 0;
 623         mci->ue_noinfo_count = 0;
 624         mci->ce_noinfo_count = 0;
 625
 626         for (row = 0; row < mci->nr_csrows; row++) {
 627                 struct csrow_info *ri = mci->csrows[row];
 628
 629                 ri->ue_count = 0;
 630                 ri->ce_count = 0;
 631
 632                 for (chan = 0; chan < ri->nr_channels; chan++)
 633                         ri->channels[chan]->ce_count = 0;
 634         }
 635
 636         cnt = 1;
 637         for (i = 0; i < mci->n_layers; i++) {
 638                 cnt *= mci->layers[i].size;
 639                 memset(mci->ce_per_layer[i], 0, cnt * sizeof(u32));
 640                 memset(mci->ue_per_layer[i], 0, cnt * sizeof(u32));
 641         }
 642
 643         mci->start_time = jiffies;
 644         return count;
 645 }
 646
 647 /* Memory scrubbing interface:
 648  *
 649  * A MC driver can limit the scrubbing bandwidth based on the CPU type.
 650  * Therefore, ->set_sdram_scrub_rate should be made to return the actual
 651  * bandwidth that is accepted or 0 when scrubbing is to be disabled.
 652  *
 653  * Negative value still means that an error has occurred while setting
 654  * the scrub rate.
 655  */
 656 static ssize_t mci_sdram_scrub_rate_store(struct device *dev,
 657                                           struct device_attribute *mattr,
 658                                           const char *data, size_t count)
 659 {
 660         struct mem_ctl_info *mci = to_mci(dev);
 661         unsigned long bandwidth = 0;
 662         int new_bw = 0;
 663
 664         if (kstrtoul(data, 10, &bandwidth) < 0)
 665                 return -EINVAL;
 666
 667         new_bw = mci->set_sdram_scrub_rate(mci, bandwidth);
 668         if (new_bw < 0) {
 669                 edac_printk(KERN_WARNING, EDAC_MC,
 670                             "Error setting scrub rate to: %lu\n", bandwidth);
 671                 return -EINVAL;
 672         }
 673
 674         return count;
 675 }
 676
 677 /*
 678  * ->get_sdram_scrub_rate() return value semantics same as above.
 679  */
 680 static ssize_t mci_sdram_scrub_rate_show(struct device *dev,
 681                                          struct device_attribute *mattr,
 682                                          char *data)
 683 {
 684         struct mem_ctl_info *mci = to_mci(dev);
 685         int bandwidth = 0;
 686
 687         bandwidth = mci->get_sdram_scrub_rate(mci);
 688         if (bandwidth < 0) {
 689                 edac_printk(KERN_DEBUG, EDAC_MC, "Error reading scrub rate\n");
 690                 return bandwidth;
 691         }
 692
 693         return sprintf(data, "%d\n", bandwidth);
 694 }
 695
 696 /* default attribute files for the MCI object */
 697 static ssize_t mci_ue_count_show(struct device *dev,
 698                                  struct device_attribute *mattr,
 699                                  char *data)
 700 {
 701         struct mem_ctl_info *mci = to_mci(dev);
 702
 703         return sprintf(data, "%d\n", mci->ue_mc);
 704 }
 705
 706 static ssize_t mci_ce_count_show(struct device *dev,
 707                                  struct device_attribute *mattr,
 708                                  char *data)
 709 {
 710         struct mem_ctl_info *mci = to_mci(dev);
 711
 712         return sprintf(data, "%d\n", mci->ce_mc);
 713 }
 714
 715 static ssize_t mci_ce_noinfo_show(struct device *dev,
 716                                   struct device_attribute *mattr,
 717                                   char *data)
 718 {
 719         struct mem_ctl_info *mci = to_mci(dev);
 720
 721         return sprintf(data, "%d\n", mci->ce_noinfo_count);
 722 }
 723
 724 static ssize_t mci_ue_noinfo_show(struct device *dev,
 725                                   struct device_attribute *mattr,
 726                                   char *data)
 727 {
 728         struct mem_ctl_info *mci = to_mci(dev);
 729
 730         return sprintf(data, "%d\n", mci->ue_noinfo_count);
 731 }
 732
 733 static ssize_t mci_seconds_show(struct device *dev,
 734                                 struct device_attribute *mattr,
 735                                 char *data)
 736 {
 737         struct mem_ctl_info *mci = to_mci(dev);
 738
 739         return sprintf(data, "%ld\n", (jiffies - mci->start_time) / HZ);
 740 }
 741
 742 static ssize_t mci_ctl_name_show(struct device *dev,
 743                                  struct device_attribute *mattr,
 744                                  char *data)
 745 {
 746         struct mem_ctl_info *mci = to_mci(dev);
 747
 748         return sprintf(data, "%s\n", mci->ctl_name);
 749 }
 750
 751 static ssize_t mci_size_mb_show(struct device *dev,
 752                                 struct device_attribute *mattr,
 753                                 char *data)
 754 {
 755         struct mem_ctl_info *mci = to_mci(dev);
 756         int total_pages = 0, csrow_idx, j;
 757
 758         for (csrow_idx = 0; csrow_idx < mci->nr_csrows; csrow_idx++) {
 759                 struct csrow_info *csrow = mci->csrows[csrow_idx];
 760
 761                 for (j = 0; j < csrow->nr_channels; j++) {
 762                         struct dimm_info *dimm = csrow->channels[j]->dimm;
 763
 764                         total_pages += dimm->nr_pages;
 765                 }
 766         }
 767
 768         return sprintf(data, "%u\n", PAGES_TO_MiB(total_pages));
 769 }
 770
 771 static ssize_t mci_max_location_show(struct device *dev,
 772                                      struct device_attribute *mattr,
 773                                      char *data)
 774 {
 775         struct mem_ctl_info *mci = to_mci(dev);
 776         int i;
 777         char *p = data;
 778
 779         for (i = 0; i < mci->n_layers; i++) {
 780                 p += sprintf(p, "%s %d ",
 781                              edac_layer_name[mci->layers[i].type],
 782                              mci->layers[i].size - 1);
 783         }
 784
 785         return p - data;
 786 }
 787
 788 #ifdef CONFIG_EDAC_DEBUG
 789 static ssize_t edac_fake_inject_write(struct file *file,
 790                                       const char __user *data,
 791                                       size_t count, loff_t *ppos)
 792 {
 793         struct device *dev = file->private_data;
 794         struct mem_ctl_info *mci = to_mci(dev);
 795         static enum hw_event_mc_err_type type;
 796         u16 errcount = mci->fake_inject_count;
 797
 798         if (!errcount)
 799                 errcount = 1;
 800
 801         type = mci->fake_inject_ue ? HW_EVENT_ERR_UNCORRECTED
 802                                    : HW_EVENT_ERR_CORRECTED;
 803
 804         printk(KERN_DEBUG
 805                "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",
 806                 errcount,
 807                 (type == HW_EVENT_ERR_UNCORRECTED) ? "UE" : "CE",
 808                 errcount > 1 ? "s" : "",
 809                 mci->fake_inject_layer[0],
 810                 mci->fake_inject_layer[1],
 811                 mci->fake_inject_layer[2]
 812                );
 813         edac_mc_handle_error(type, mci, errcount, 0, 0, 0,
 814                              mci->fake_inject_layer[0],
 815                              mci->fake_inject_layer[1],
 816                              mci->fake_inject_layer[2],
 817                              "FAKE ERROR", "for EDAC testing only");
 818
 819         return count;
 820 }
 821
 822 static const struct file_operations debug_fake_inject_fops = {
 823         .open = simple_open,
 824         .write = edac_fake_inject_write,
 825         .llseek = generic_file_llseek,
 826 };
 827 #endif
 828
 829 /* default Control file */
 830 static DEVICE_ATTR(reset_counters, S_IWUSR, NULL, mci_reset_counters_store);
 831
 832 /* default Attribute files */
 833 static DEVICE_ATTR(mc_name, S_IRUGO, mci_ctl_name_show, NULL);
 834 static DEVICE_ATTR(size_mb, S_IRUGO, mci_size_mb_show, NULL);
 835 static DEVICE_ATTR(seconds_since_reset, S_IRUGO, mci_seconds_show, NULL);
 836 static DEVICE_ATTR(ue_noinfo_count, S_IRUGO, mci_ue_noinfo_show, NULL);
 837 static DEVICE_ATTR(ce_noinfo_count, S_IRUGO, mci_ce_noinfo_show, NULL);
 838 static DEVICE_ATTR(ue_count, S_IRUGO, mci_ue_count_show, NULL);
 839 static DEVICE_ATTR(ce_count, S_IRUGO, mci_ce_count_show, NULL);
 840 static DEVICE_ATTR(max_location, S_IRUGO, mci_max_location_show, NULL);
 841
 842 /* memory scrubber attribute file */
 843 DEVICE_ATTR(sdram_scrub_rate, 0, mci_sdram_scrub_rate_show,
 844             mci_sdram_scrub_rate_store); /* umode set later in is_visible */
 845
 846 static struct attribute *mci_attrs[] = {
 847         &dev_attr_reset_counters.attr,
 848         &dev_attr_mc_name.attr,
 849         &dev_attr_size_mb.attr,
 850         &dev_attr_seconds_since_reset.attr,
 851         &dev_attr_ue_noinfo_count.attr,
 852         &dev_attr_ce_noinfo_count.attr,
 853         &dev_attr_ue_count.attr,
 854         &dev_attr_ce_count.attr,
 855         &dev_attr_max_location.attr,
 856         &dev_attr_sdram_scrub_rate.attr,
 857         NULL
 858 };
 859
 860 static umode_t mci_attr_is_visible(struct kobject *kobj,
 861                                    struct attribute *attr, int idx)
 862 {
 863         struct device *dev = kobj_to_dev(kobj);
 864         struct mem_ctl_info *mci = to_mci(dev);
 865         umode_t mode = 0;
 866
 867         if (attr != &dev_attr_sdram_scrub_rate.attr)
 868                 return attr->mode;
 869         if (mci->get_sdram_scrub_rate)
 870                 mode |= S_IRUGO;
 871         if (mci->set_sdram_scrub_rate)
 872                 mode |= S_IWUSR;
 873         return mode;
 874 }
 875
 876 static struct attribute_group mci_attr_grp = {
 877         .attrs  = mci_attrs,
 878         .is_visible = mci_attr_is_visible,
 879 };
 880
 881 static const struct attribute_group *mci_attr_groups[] = {
 882         &mci_attr_grp,
 883         NULL
 884 };
 885
 886 static void mci_attr_release(struct device *dev)
 887 {
 888         struct mem_ctl_info *mci = container_of(dev, struct mem_ctl_info, dev);
 889
 890         edac_dbg(1, "Releasing csrow device %s\n", dev_name(dev));
 891         kfree(mci);
 892 }
 893
 894 static struct device_type mci_attr_type = {
 895         .groups         = mci_attr_groups,
 896         .release        = mci_attr_release,
 897 };
 898
 899 #ifdef CONFIG_EDAC_DEBUG
 900 static struct dentry *edac_debugfs;
 901
 902 int __init edac_debugfs_init(void)
 903 {
 904         edac_debugfs = debugfs_create_dir("edac", NULL);
 905         if (IS_ERR(edac_debugfs)) {
 906                 edac_debugfs = NULL;
 907                 return -ENOMEM;
 908         }
 909         return 0;
 910 }
 911
 912 void edac_debugfs_exit(void)
 913 {
 914         debugfs_remove(edac_debugfs);
 915 }
 916
 917 static int edac_create_debug_nodes(struct mem_ctl_info *mci)
 918 {
 919         struct dentry *d, *parent;
 920         char name[80];
 921         int i;
 922
 923         if (!edac_debugfs)
 924                 return -ENODEV;
 925
 926         d = debugfs_create_dir(mci->dev.kobj.name, edac_debugfs);
 927         if (!d)
 928                 return -ENOMEM;
 929         parent = d;
 930
 931         for (i = 0; i < mci->n_layers; i++) {
 932                 sprintf(name, "fake_inject_%s",
 933                              edac_layer_name[mci->layers[i].type]);
 934                 d = debugfs_create_u8(name, S_IRUGO | S_IWUSR, parent,
 935                                       &mci->fake_inject_layer[i]);
 936                 if (!d)
 937                         goto nomem;
 938         }
 939
 940         d = debugfs_create_bool("fake_inject_ue", S_IRUGO | S_IWUSR, parent,
 941                                 &mci->fake_inject_ue);
 942         if (!d)
 943                 goto nomem;
 944
 945         d = debugfs_create_u16("fake_inject_count", S_IRUGO | S_IWUSR, parent,
 946                                 &mci->fake_inject_count);
 947         if (!d)
 948                 goto nomem;
 949
 950         d = debugfs_create_file("fake_inject", S_IWUSR, parent,
 951                                 &mci->dev,
 952                                 &debug_fake_inject_fops);
 953         if (!d)
 954                 goto nomem;
 955
 956         mci->debugfs = parent;
 957         return 0;
 958 nomem:
 959         debugfs_remove(mci->debugfs);
 960         return -ENOMEM;
 961 }
 962 #endif
 963
 964 /*
 965  * Create a new Memory Controller kobject instance,
 966  *      mc<id> under the 'mc' directory
 967  *
 968  * Return:
 969  *      0       Success
 970  *      !0      Failure
 971  */
 972 int edac_create_sysfs_mci_device(struct mem_ctl_info *mci,
 973                                  const struct attribute_group **groups)
 974 {
 975         int i, err;
 976
 977         /*
 978          * The memory controller needs its own bus, in order to avoid
 979          * namespace conflicts at /sys/bus/edac.
 980          */
 981         mci->bus->name = kasprintf(GFP_KERNEL, "mc%d", mci->mc_idx);
 982         if (!mci->bus->name)
 983                 return -ENOMEM;
 984
 985         edac_dbg(0, "creating bus %s\n", mci->bus->name);
 986
 987         err = bus_register(mci->bus);
 988         if (err < 0)
 989                 goto fail_free_name;
 990
 991         /* get the /sys/devices/system/edac subsys reference */
 992         mci->dev.type = &mci_attr_type;
 993         device_initialize(&mci->dev);
 994
 995         mci->dev.parent = mci_pdev;
 996         mci->dev.bus = mci->bus;
 997         mci->dev.groups = groups;
 998         dev_set_name(&mci->dev, "mc%d", mci->mc_idx);
 999         dev_set_drvdata(&mci->dev, mci);
1000         pm_runtime_forbid(&mci->dev);
1001
1002         edac_dbg(0, "creating device %s\n", dev_name(&mci->dev));
1003         err = device_add(&mci->dev);
1004         if (err < 0) {
1005                 edac_dbg(1, "failure: create device %s\n", dev_name(&mci->dev));
1006                 goto fail_unregister_bus;
1007         }
1008
1009         /*
1010          * Create the dimm/rank devices
1011          */
1012         for (i = 0; i < mci->tot_dimms; i++) {
1013                 struct dimm_info *dimm = mci->dimms[i];
1014                 /* Only expose populated DIMMs */
1015                 if (!dimm->nr_pages)
1016                         continue;
1017
1018 #ifdef CONFIG_EDAC_DEBUG
1019                 edac_dbg(1, "creating dimm%d, located at ", i);
1020                 if (edac_debug_level >= 1) {
1021                         int lay;
1022                         for (lay = 0; lay < mci->n_layers; lay++)
1023                                 printk(KERN_CONT "%s %d ",
1024                                         edac_layer_name[mci->layers[lay].type],
1025                                         dimm->location[lay]);
1026                         printk(KERN_CONT "\n");
1027                 }
1028 #endif
1029                 err = edac_create_dimm_object(mci, dimm, i);
1030                 if (err) {
1031                         edac_dbg(1, "failure: create dimm %d obj\n", i);
1032                         goto fail_unregister_dimm;
1033                 }
1034         }
1035
1036 #ifdef CONFIG_EDAC_LEGACY_SYSFS
1037         err = edac_create_csrow_objects(mci);
1038         if (err < 0)
1039                 goto fail_unregister_dimm;
1040 #endif
1041
1042 #ifdef CONFIG_EDAC_DEBUG
1043         edac_create_debug_nodes(mci);
1044 #endif
1045         return 0;
1046
1047 fail_unregister_dimm:
1048         for (i--; i >= 0; i--) {
1049                 struct dimm_info *dimm = mci->dimms[i];
1050                 if (!dimm->nr_pages)
1051                         continue;
1052
1053                 device_unregister(&dimm->dev);
1054         }
1055         device_unregister(&mci->dev);
1056 fail_unregister_bus:
1057         bus_unregister(mci->bus);
1058 fail_free_name:
1059         kfree(mci->bus->name);
1060         return err;
1061 }
1062
1063 /*
1064  * remove a Memory Controller instance
1065  */
1066 void edac_remove_sysfs_mci_device(struct mem_ctl_info *mci)
1067 {
1068         int i;
1069
1070         edac_dbg(0, "\n");
1071
1072 #ifdef CONFIG_EDAC_DEBUG
1073         debugfs_remove(mci->debugfs);
1074 #endif
1075 #ifdef CONFIG_EDAC_LEGACY_SYSFS
1076         edac_delete_csrow_objects(mci);
1077 #endif
1078
1079         for (i = 0; i < mci->tot_dimms; i++) {
1080                 struct dimm_info *dimm = mci->dimms[i];
1081                 if (dimm->nr_pages == 0)
1082                         continue;
1083                 edac_dbg(0, "removing device %s\n", dev_name(&dimm->dev));
1084                 device_unregister(&dimm->dev);
1085         }
1086 }
1087
1088 void edac_unregister_sysfs(struct mem_ctl_info *mci)
1089 {
1090         edac_dbg(1, "Unregistering device %s\n", dev_name(&mci->dev));
1091         device_unregister(&mci->dev);
1092         bus_unregister(mci->bus);
1093         kfree(mci->bus->name);
1094 }
1095
1096 static void mc_attr_release(struct device *dev)
1097 {
1098         /*
1099          * There's no container structure here, as this is just the mci
1100          * parent device, used to create the /sys/devices/mc sysfs node.
1101          * So, there are no attributes on it.
1102          */
1103         edac_dbg(1, "Releasing device %s\n", dev_name(dev));
1104         kfree(dev);
1105 }
1106
1107 static struct device_type mc_attr_type = {
1108         .release        = mc_attr_release,
1109 };
1110 /*
1111  * Init/exit code for the module. Basically, creates/removes /sys/class/rc
1112  */
1113 int __init edac_mc_sysfs_init(void)
1114 {
1115         struct bus_type *edac_subsys;
1116         int err;
1117
1118         /* get the /sys/devices/system/edac subsys reference */
1119         edac_subsys = edac_get_sysfs_subsys();
1120         if (edac_subsys == NULL) {
1121                 edac_dbg(1, "no edac_subsys\n");
1122                 err = -EINVAL;
1123                 goto out;
1124         }
1125
1126         mci_pdev = kzalloc(sizeof(*mci_pdev), GFP_KERNEL);
1127         if (!mci_pdev) {
1128                 err = -ENOMEM;
1129                 goto out_put_sysfs;
1130         }
1131
1132         mci_pdev->bus = edac_subsys;
1133         mci_pdev->type = &mc_attr_type;
1134         device_initialize(mci_pdev);
1135         dev_set_name(mci_pdev, "mc");
1136
1137         err = device_add(mci_pdev);
1138         if (err < 0)
1139                 goto out_dev_free;
1140
1141         edac_dbg(0, "device %s created\n", dev_name(mci_pdev));
1142
1143         return 0;
1144
1145  out_dev_free:
1146         kfree(mci_pdev);
1147  out_put_sysfs:
1148         edac_put_sysfs_subsys();
1149  out:
1150         return err;
1151 }
1152
1153 void edac_mc_sysfs_exit(void)
1154 {
1155         device_unregister(mci_pdev);
1156         edac_put_sysfs_subsys();
1157 }