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 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, sizeof(rank->dimm->label) + 1, "%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         size_t copy_count = count;
 244
 245         if (count == 0)
 246                 return -EINVAL;
 247
 248         if (data[count - 1] == '\0' || data[count - 1] == '\n')
 249                 copy_count -= 1;
 250
 251         if (copy_count == 0 || copy_count >= sizeof(rank->dimm->label))
 252                 return -EINVAL;
 253
 254         strncpy(rank->dimm->label, data, copy_count);
 255         rank->dimm->label[copy_count] = '\0';
 256
 257         return count;
 258 }
 259
 260 /* show function for dynamic chX_ce_count attribute */
 261 static ssize_t channel_ce_count_show(struct device *dev,
 262                                      struct device_attribute *mattr, char *data)
 263 {
 264         struct csrow_info *csrow = to_csrow(dev);
 265         unsigned chan = to_channel(mattr);
 266         struct rank_info *rank = csrow->channels[chan];
 267
 268         return sprintf(data, "%u\n", rank->ce_count);
 269 }
 270
 271 /* cwrow<id>/attribute files */
 272 DEVICE_ATTR_LEGACY(size_mb, S_IRUGO, csrow_size_show, NULL);
 273 DEVICE_ATTR_LEGACY(dev_type, S_IRUGO, csrow_dev_type_show, NULL);
 274 DEVICE_ATTR_LEGACY(mem_type, S_IRUGO, csrow_mem_type_show, NULL);
 275 DEVICE_ATTR_LEGACY(edac_mode, S_IRUGO, csrow_edac_mode_show, NULL);
 276 DEVICE_ATTR_LEGACY(ue_count, S_IRUGO, csrow_ue_count_show, NULL);
 277 DEVICE_ATTR_LEGACY(ce_count, S_IRUGO, csrow_ce_count_show, NULL);
 278
 279 /* default attributes of the CSROW<id> object */
 280 static struct attribute *csrow_attrs[] = {
 281         &dev_attr_legacy_dev_type.attr,
 282         &dev_attr_legacy_mem_type.attr,
 283         &dev_attr_legacy_edac_mode.attr,
 284         &dev_attr_legacy_size_mb.attr,
 285         &dev_attr_legacy_ue_count.attr,
 286         &dev_attr_legacy_ce_count.attr,
 287         NULL,
 288 };
 289
 290 static struct attribute_group csrow_attr_grp = {
 291         .attrs  = csrow_attrs,
 292 };
 293
 294 static const struct attribute_group *csrow_attr_groups[] = {
 295         &csrow_attr_grp,
 296         NULL
 297 };
 298
 299 static void csrow_attr_release(struct device *dev)
 300 {
 301         struct csrow_info *csrow = container_of(dev, struct csrow_info, dev);
 302
 303         edac_dbg(1, "Releasing csrow device %s\n", dev_name(dev));
 304         kfree(csrow);
 305 }
 306
 307 static struct device_type csrow_attr_type = {
 308         .groups         = csrow_attr_groups,
 309         .release        = csrow_attr_release,
 310 };
 311
 312 /*
 313  * possible dynamic channel DIMM Label attribute files
 314  *
 315  */
 316 DEVICE_CHANNEL(ch0_dimm_label, S_IRUGO | S_IWUSR,
 317         channel_dimm_label_show, channel_dimm_label_store, 0);
 318 DEVICE_CHANNEL(ch1_dimm_label, S_IRUGO | S_IWUSR,
 319         channel_dimm_label_show, channel_dimm_label_store, 1);
 320 DEVICE_CHANNEL(ch2_dimm_label, S_IRUGO | S_IWUSR,
 321         channel_dimm_label_show, channel_dimm_label_store, 2);
 322 DEVICE_CHANNEL(ch3_dimm_label, S_IRUGO | S_IWUSR,
 323         channel_dimm_label_show, channel_dimm_label_store, 3);
 324 DEVICE_CHANNEL(ch4_dimm_label, S_IRUGO | S_IWUSR,
 325         channel_dimm_label_show, channel_dimm_label_store, 4);
 326 DEVICE_CHANNEL(ch5_dimm_label, S_IRUGO | S_IWUSR,
 327         channel_dimm_label_show, channel_dimm_label_store, 5);
 328 DEVICE_CHANNEL(ch6_dimm_label, S_IRUGO | S_IWUSR,
 329         channel_dimm_label_show, channel_dimm_label_store, 6);
 330 DEVICE_CHANNEL(ch7_dimm_label, S_IRUGO | S_IWUSR,
 331         channel_dimm_label_show, channel_dimm_label_store, 7);
 332
 333 /* Total possible dynamic DIMM Label attribute file table */
 334 static struct attribute *dynamic_csrow_dimm_attr[] = {
 335         &dev_attr_legacy_ch0_dimm_label.attr.attr,
 336         &dev_attr_legacy_ch1_dimm_label.attr.attr,
 337         &dev_attr_legacy_ch2_dimm_label.attr.attr,
 338         &dev_attr_legacy_ch3_dimm_label.attr.attr,
 339         &dev_attr_legacy_ch4_dimm_label.attr.attr,
 340         &dev_attr_legacy_ch5_dimm_label.attr.attr,
 341         &dev_attr_legacy_ch6_dimm_label.attr.attr,
 342         &dev_attr_legacy_ch7_dimm_label.attr.attr,
 343         NULL
 344 };
 345
 346 /* possible dynamic channel ce_count attribute files */
 347 DEVICE_CHANNEL(ch0_ce_count, S_IRUGO,
 348                    channel_ce_count_show, NULL, 0);
 349 DEVICE_CHANNEL(ch1_ce_count, S_IRUGO,
 350                    channel_ce_count_show, NULL, 1);
 351 DEVICE_CHANNEL(ch2_ce_count, S_IRUGO,
 352                    channel_ce_count_show, NULL, 2);
 353 DEVICE_CHANNEL(ch3_ce_count, S_IRUGO,
 354                    channel_ce_count_show, NULL, 3);
 355 DEVICE_CHANNEL(ch4_ce_count, S_IRUGO,
 356                    channel_ce_count_show, NULL, 4);
 357 DEVICE_CHANNEL(ch5_ce_count, S_IRUGO,
 358                    channel_ce_count_show, NULL, 5);
 359 DEVICE_CHANNEL(ch6_ce_count, S_IRUGO,
 360                    channel_ce_count_show, NULL, 6);
 361 DEVICE_CHANNEL(ch7_ce_count, S_IRUGO,
 362                    channel_ce_count_show, NULL, 7);
 363
 364 /* Total possible dynamic ce_count attribute file table */
 365 static struct attribute *dynamic_csrow_ce_count_attr[] = {
 366         &dev_attr_legacy_ch0_ce_count.attr.attr,
 367         &dev_attr_legacy_ch1_ce_count.attr.attr,
 368         &dev_attr_legacy_ch2_ce_count.attr.attr,
 369         &dev_attr_legacy_ch3_ce_count.attr.attr,
 370         &dev_attr_legacy_ch4_ce_count.attr.attr,
 371         &dev_attr_legacy_ch5_ce_count.attr.attr,
 372         &dev_attr_legacy_ch6_ce_count.attr.attr,
 373         &dev_attr_legacy_ch7_ce_count.attr.attr,
 374         NULL
 375 };
 376
 377 static umode_t csrow_dev_is_visible(struct kobject *kobj,
 378                                     struct attribute *attr, int idx)
 379 {
 380         struct device *dev = kobj_to_dev(kobj);
 381         struct csrow_info *csrow = container_of(dev, struct csrow_info, dev);
 382
 383         if (idx >= csrow->nr_channels)
 384                 return 0;
 385
 386         if (idx >= ARRAY_SIZE(dynamic_csrow_ce_count_attr) - 1) {
 387                 WARN_ONCE(1, "idx: %d\n", idx);
 388                 return 0;
 389         }
 390
 391         /* Only expose populated DIMMs */
 392         if (!csrow->channels[idx]->dimm->nr_pages)
 393                 return 0;
 394
 395         return attr->mode;
 396 }
 397
 398
 399 static const struct attribute_group csrow_dev_dimm_group = {
 400         .attrs = dynamic_csrow_dimm_attr,
 401         .is_visible = csrow_dev_is_visible,
 402 };
 403
 404 static const struct attribute_group csrow_dev_ce_count_group = {
 405         .attrs = dynamic_csrow_ce_count_attr,
 406         .is_visible = csrow_dev_is_visible,
 407 };
 408
 409 static const struct attribute_group *csrow_dev_groups[] = {
 410         &csrow_dev_dimm_group,
 411         &csrow_dev_ce_count_group,
 412         NULL
 413 };
 414
 415 static inline int nr_pages_per_csrow(struct csrow_info *csrow)
 416 {
 417         int chan, nr_pages = 0;
 418
 419         for (chan = 0; chan < csrow->nr_channels; chan++)
 420                 nr_pages += csrow->channels[chan]->dimm->nr_pages;
 421
 422         return nr_pages;
 423 }
 424
 425 /* Create a CSROW object under specifed edac_mc_device */
 426 static int edac_create_csrow_object(struct mem_ctl_info *mci,
 427                                     struct csrow_info *csrow, int index)
 428 {
 429         csrow->dev.type = &csrow_attr_type;
 430         csrow->dev.bus = mci->bus;
 431         csrow->dev.groups = csrow_dev_groups;
 432         device_initialize(&csrow->dev);
 433         csrow->dev.parent = &mci->dev;
 434         csrow->mci = mci;
 435         dev_set_name(&csrow->dev, "csrow%d", index);
 436         dev_set_drvdata(&csrow->dev, csrow);
 437
 438         edac_dbg(0, "creating (virtual) csrow node %s\n",
 439                  dev_name(&csrow->dev));
 440
 441         return device_add(&csrow->dev);
 442 }
 443
 444 /* Create a CSROW object under specifed edac_mc_device */
 445 static int edac_create_csrow_objects(struct mem_ctl_info *mci)
 446 {
 447         int err, i;
 448         struct csrow_info *csrow;
 449
 450         for (i = 0; i < mci->nr_csrows; i++) {
 451                 csrow = mci->csrows[i];
 452                 if (!nr_pages_per_csrow(csrow))
 453                         continue;
 454                 err = edac_create_csrow_object(mci, mci->csrows[i], i);
 455                 if (err < 0) {
 456                         edac_dbg(1,
 457                                  "failure: create csrow objects for csrow %d\n",
 458                                  i);
 459                         goto error;
 460                 }
 461         }
 462         return 0;
 463
 464 error:
 465         for (--i; i >= 0; i--) {
 466                 csrow = mci->csrows[i];
 467                 if (!nr_pages_per_csrow(csrow))
 468                         continue;
 469                 put_device(&mci->csrows[i]->dev);
 470         }
 471
 472         return err;
 473 }
 474
 475 static void edac_delete_csrow_objects(struct mem_ctl_info *mci)
 476 {
 477         int i;
 478         struct csrow_info *csrow;
 479
 480         for (i = mci->nr_csrows - 1; i >= 0; i--) {
 481                 csrow = mci->csrows[i];
 482                 if (!nr_pages_per_csrow(csrow))
 483                         continue;
 484                 device_unregister(&mci->csrows[i]->dev);
 485         }
 486 }
 487 #endif
 488
 489 /*
 490  * Per-dimm (or per-rank) devices
 491  */
 492
 493 #define to_dimm(k) container_of(k, struct dimm_info, dev)
 494
 495 /* show/store functions for DIMM Label attributes */
 496 static ssize_t dimmdev_location_show(struct device *dev,
 497                                      struct device_attribute *mattr, char *data)
 498 {
 499         struct dimm_info *dimm = to_dimm(dev);
 500
 501         return edac_dimm_info_location(dimm, data, PAGE_SIZE);
 502 }
 503
 504 static ssize_t dimmdev_label_show(struct device *dev,
 505                                   struct device_attribute *mattr, char *data)
 506 {
 507         struct dimm_info *dimm = to_dimm(dev);
 508
 509         /* if field has not been initialized, there is nothing to send */
 510         if (!dimm->label[0])
 511                 return 0;
 512
 513         return snprintf(data, sizeof(dimm->label) + 1, "%s\n", dimm->label);
 514 }
 515
 516 static ssize_t dimmdev_label_store(struct device *dev,
 517                                    struct device_attribute *mattr,
 518                                    const char *data,
 519                                    size_t count)
 520 {
 521         struct dimm_info *dimm = to_dimm(dev);
 522         size_t copy_count = count;
 523
 524         if (count == 0)
 525                 return -EINVAL;
 526
 527         if (data[count - 1] == '\0' || data[count - 1] == '\n')
 528                 copy_count -= 1;
 529
 530         if (copy_count == 0 || copy_count >= sizeof(dimm->label))
 531                 return -EINVAL;
 532
 533         strncpy(dimm->label, data, copy_count);
 534         dimm->label[copy_count] = '\0';
 535
 536         return count;
 537 }
 538
 539 static ssize_t dimmdev_size_show(struct device *dev,
 540                                  struct device_attribute *mattr, char *data)
 541 {
 542         struct dimm_info *dimm = to_dimm(dev);
 543
 544         return sprintf(data, "%u\n", PAGES_TO_MiB(dimm->nr_pages));
 545 }
 546
 547 static ssize_t dimmdev_mem_type_show(struct device *dev,
 548                                      struct device_attribute *mattr, char *data)
 549 {
 550         struct dimm_info *dimm = to_dimm(dev);
 551
 552         return sprintf(data, "%s\n", mem_types[dimm->mtype]);
 553 }
 554
 555 static ssize_t dimmdev_dev_type_show(struct device *dev,
 556                                      struct device_attribute *mattr, char *data)
 557 {
 558         struct dimm_info *dimm = to_dimm(dev);
 559
 560         return sprintf(data, "%s\n", dev_types[dimm->dtype]);
 561 }
 562
 563 static ssize_t dimmdev_edac_mode_show(struct device *dev,
 564                                       struct device_attribute *mattr,
 565                                       char *data)
 566 {
 567         struct dimm_info *dimm = to_dimm(dev);
 568
 569         return sprintf(data, "%s\n", edac_caps[dimm->edac_mode]);
 570 }
 571
 572 /* dimm/rank attribute files */
 573 static DEVICE_ATTR(dimm_label, S_IRUGO | S_IWUSR,
 574                    dimmdev_label_show, dimmdev_label_store);
 575 static DEVICE_ATTR(dimm_location, S_IRUGO, dimmdev_location_show, NULL);
 576 static DEVICE_ATTR(size, S_IRUGO, dimmdev_size_show, NULL);
 577 static DEVICE_ATTR(dimm_mem_type, S_IRUGO, dimmdev_mem_type_show, NULL);
 578 static DEVICE_ATTR(dimm_dev_type, S_IRUGO, dimmdev_dev_type_show, NULL);
 579 static DEVICE_ATTR(dimm_edac_mode, S_IRUGO, dimmdev_edac_mode_show, NULL);
 580
 581 /* attributes of the dimm<id>/rank<id> object */
 582 static struct attribute *dimm_attrs[] = {
 583         &dev_attr_dimm_label.attr,
 584         &dev_attr_dimm_location.attr,
 585         &dev_attr_size.attr,
 586         &dev_attr_dimm_mem_type.attr,
 587         &dev_attr_dimm_dev_type.attr,
 588         &dev_attr_dimm_edac_mode.attr,
 589         NULL,
 590 };
 591
 592 static struct attribute_group dimm_attr_grp = {
 593         .attrs  = dimm_attrs,
 594 };
 595
 596 static const struct attribute_group *dimm_attr_groups[] = {
 597         &dimm_attr_grp,
 598         NULL
 599 };
 600
 601 static void dimm_attr_release(struct device *dev)
 602 {
 603         struct dimm_info *dimm = container_of(dev, struct dimm_info, dev);
 604
 605         edac_dbg(1, "Releasing dimm device %s\n", dev_name(dev));
 606         kfree(dimm);
 607 }
 608
 609 static struct device_type dimm_attr_type = {
 610         .groups         = dimm_attr_groups,
 611         .release        = dimm_attr_release,
 612 };
 613
 614 /* Create a DIMM object under specifed memory controller device */
 615 static int edac_create_dimm_object(struct mem_ctl_info *mci,
 616                                    struct dimm_info *dimm,
 617                                    int index)
 618 {
 619         int err;
 620         dimm->mci = mci;
 621
 622         dimm->dev.type = &dimm_attr_type;
 623         dimm->dev.bus = mci->bus;
 624         device_initialize(&dimm->dev);
 625
 626         dimm->dev.parent = &mci->dev;
 627         if (mci->csbased)
 628                 dev_set_name(&dimm->dev, "rank%d", index);
 629         else
 630                 dev_set_name(&dimm->dev, "dimm%d", index);
 631         dev_set_drvdata(&dimm->dev, dimm);
 632         pm_runtime_forbid(&mci->dev);
 633
 634         err =  device_add(&dimm->dev);
 635
 636         edac_dbg(0, "creating rank/dimm device %s\n", dev_name(&dimm->dev));
 637
 638         return err;
 639 }
 640
 641 /*
 642  * Memory controller device
 643  */
 644
 645 #define to_mci(k) container_of(k, struct mem_ctl_info, dev)
 646
 647 static ssize_t mci_reset_counters_store(struct device *dev,
 648                                         struct device_attribute *mattr,
 649                                         const char *data, size_t count)
 650 {
 651         struct mem_ctl_info *mci = to_mci(dev);
 652         int cnt, row, chan, i;
 653         mci->ue_mc = 0;
 654         mci->ce_mc = 0;
 655         mci->ue_noinfo_count = 0;
 656         mci->ce_noinfo_count = 0;
 657
 658         for (row = 0; row < mci->nr_csrows; row++) {
 659                 struct csrow_info *ri = mci->csrows[row];
 660
 661                 ri->ue_count = 0;
 662                 ri->ce_count = 0;
 663
 664                 for (chan = 0; chan < ri->nr_channels; chan++)
 665                         ri->channels[chan]->ce_count = 0;
 666         }
 667
 668         cnt = 1;
 669         for (i = 0; i < mci->n_layers; i++) {
 670                 cnt *= mci->layers[i].size;
 671                 memset(mci->ce_per_layer[i], 0, cnt * sizeof(u32));
 672                 memset(mci->ue_per_layer[i], 0, cnt * sizeof(u32));
 673         }
 674
 675         mci->start_time = jiffies;
 676         return count;
 677 }
 678
 679 /* Memory scrubbing interface:
 680  *
 681  * A MC driver can limit the scrubbing bandwidth based on the CPU type.
 682  * Therefore, ->set_sdram_scrub_rate should be made to return the actual
 683  * bandwidth that is accepted or 0 when scrubbing is to be disabled.
 684  *
 685  * Negative value still means that an error has occurred while setting
 686  * the scrub rate.
 687  */
 688 static ssize_t mci_sdram_scrub_rate_store(struct device *dev,
 689                                           struct device_attribute *mattr,
 690                                           const char *data, size_t count)
 691 {
 692         struct mem_ctl_info *mci = to_mci(dev);
 693         unsigned long bandwidth = 0;
 694         int new_bw = 0;
 695
 696         if (kstrtoul(data, 10, &bandwidth) < 0)
 697                 return -EINVAL;
 698
 699         new_bw = mci->set_sdram_scrub_rate(mci, bandwidth);
 700         if (new_bw < 0) {
 701                 edac_printk(KERN_WARNING, EDAC_MC,
 702                             "Error setting scrub rate to: %lu\n", bandwidth);
 703                 return -EINVAL;
 704         }
 705
 706         return count;
 707 }
 708
 709 /*
 710  * ->get_sdram_scrub_rate() return value semantics same as above.
 711  */
 712 static ssize_t mci_sdram_scrub_rate_show(struct device *dev,
 713                                          struct device_attribute *mattr,
 714                                          char *data)
 715 {
 716         struct mem_ctl_info *mci = to_mci(dev);
 717         int bandwidth = 0;
 718
 719         bandwidth = mci->get_sdram_scrub_rate(mci);
 720         if (bandwidth < 0) {
 721                 edac_printk(KERN_DEBUG, EDAC_MC, "Error reading scrub rate\n");
 722                 return bandwidth;
 723         }
 724
 725         return sprintf(data, "%d\n", bandwidth);
 726 }
 727
 728 /* default attribute files for the MCI object */
 729 static ssize_t mci_ue_count_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_mc);
 736 }
 737
 738 static ssize_t mci_ce_count_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, "%d\n", mci->ce_mc);
 745 }
 746
 747 static ssize_t mci_ce_noinfo_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, "%d\n", mci->ce_noinfo_count);
 754 }
 755
 756 static ssize_t mci_ue_noinfo_show(struct device *dev,
 757                                   struct device_attribute *mattr,
 758                                   char *data)
 759 {
 760         struct mem_ctl_info *mci = to_mci(dev);
 761
 762         return sprintf(data, "%d\n", mci->ue_noinfo_count);
 763 }
 764
 765 static ssize_t mci_seconds_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, "%ld\n", (jiffies - mci->start_time) / HZ);
 772 }
 773
 774 static ssize_t mci_ctl_name_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, "%s\n", mci->ctl_name);
 781 }
 782
 783 static ssize_t mci_size_mb_show(struct device *dev,
 784                                 struct device_attribute *mattr,
 785                                 char *data)
 786 {
 787         struct mem_ctl_info *mci = to_mci(dev);
 788         int total_pages = 0, csrow_idx, j;
 789
 790         for (csrow_idx = 0; csrow_idx < mci->nr_csrows; csrow_idx++) {
 791                 struct csrow_info *csrow = mci->csrows[csrow_idx];
 792
 793                 for (j = 0; j < csrow->nr_channels; j++) {
 794                         struct dimm_info *dimm = csrow->channels[j]->dimm;
 795
 796                         total_pages += dimm->nr_pages;
 797                 }
 798         }
 799
 800         return sprintf(data, "%u\n", PAGES_TO_MiB(total_pages));
 801 }
 802
 803 static ssize_t mci_max_location_show(struct device *dev,
 804                                      struct device_attribute *mattr,
 805                                      char *data)
 806 {
 807         struct mem_ctl_info *mci = to_mci(dev);
 808         int i;
 809         char *p = data;
 810
 811         for (i = 0; i < mci->n_layers; i++) {
 812                 p += sprintf(p, "%s %d ",
 813                              edac_layer_name[mci->layers[i].type],
 814                              mci->layers[i].size - 1);
 815         }
 816
 817         return p - data;
 818 }
 819
 820 /* default Control file */
 821 static DEVICE_ATTR(reset_counters, S_IWUSR, NULL, mci_reset_counters_store);
 822
 823 /* default Attribute files */
 824 static DEVICE_ATTR(mc_name, S_IRUGO, mci_ctl_name_show, NULL);
 825 static DEVICE_ATTR(size_mb, S_IRUGO, mci_size_mb_show, NULL);
 826 static DEVICE_ATTR(seconds_since_reset, S_IRUGO, mci_seconds_show, NULL);
 827 static DEVICE_ATTR(ue_noinfo_count, S_IRUGO, mci_ue_noinfo_show, NULL);
 828 static DEVICE_ATTR(ce_noinfo_count, S_IRUGO, mci_ce_noinfo_show, NULL);
 829 static DEVICE_ATTR(ue_count, S_IRUGO, mci_ue_count_show, NULL);
 830 static DEVICE_ATTR(ce_count, S_IRUGO, mci_ce_count_show, NULL);
 831 static DEVICE_ATTR(max_location, S_IRUGO, mci_max_location_show, NULL);
 832
 833 /* memory scrubber attribute file */
 834 DEVICE_ATTR(sdram_scrub_rate, 0, mci_sdram_scrub_rate_show,
 835             mci_sdram_scrub_rate_store); /* umode set later in is_visible */
 836
 837 static struct attribute *mci_attrs[] = {
 838         &dev_attr_reset_counters.attr,
 839         &dev_attr_mc_name.attr,
 840         &dev_attr_size_mb.attr,
 841         &dev_attr_seconds_since_reset.attr,
 842         &dev_attr_ue_noinfo_count.attr,
 843         &dev_attr_ce_noinfo_count.attr,
 844         &dev_attr_ue_count.attr,
 845         &dev_attr_ce_count.attr,
 846         &dev_attr_max_location.attr,
 847         &dev_attr_sdram_scrub_rate.attr,
 848         NULL
 849 };
 850
 851 static umode_t mci_attr_is_visible(struct kobject *kobj,
 852                                    struct attribute *attr, int idx)
 853 {
 854         struct device *dev = kobj_to_dev(kobj);
 855         struct mem_ctl_info *mci = to_mci(dev);
 856         umode_t mode = 0;
 857
 858         if (attr != &dev_attr_sdram_scrub_rate.attr)
 859                 return attr->mode;
 860         if (mci->get_sdram_scrub_rate)
 861                 mode |= S_IRUGO;
 862         if (mci->set_sdram_scrub_rate)
 863                 mode |= S_IWUSR;
 864         return mode;
 865 }
 866
 867 static struct attribute_group mci_attr_grp = {
 868         .attrs  = mci_attrs,
 869         .is_visible = mci_attr_is_visible,
 870 };
 871
 872 static const struct attribute_group *mci_attr_groups[] = {
 873         &mci_attr_grp,
 874         NULL
 875 };
 876
 877 static void mci_attr_release(struct device *dev)
 878 {
 879         struct mem_ctl_info *mci = container_of(dev, struct mem_ctl_info, dev);
 880
 881         edac_dbg(1, "Releasing csrow device %s\n", dev_name(dev));
 882         kfree(mci);
 883 }
 884
 885 static struct device_type mci_attr_type = {
 886         .groups         = mci_attr_groups,
 887         .release        = mci_attr_release,
 888 };
 889
 890 /*
 891  * Create a new Memory Controller kobject instance,
 892  *      mc<id> under the 'mc' directory
 893  *
 894  * Return:
 895  *      0       Success
 896  *      !0      Failure
 897  */
 898 int edac_create_sysfs_mci_device(struct mem_ctl_info *mci,
 899                                  const struct attribute_group **groups)
 900 {
 901         char *name;
 902         int i, err;
 903
 904         /*
 905          * The memory controller needs its own bus, in order to avoid
 906          * namespace conflicts at /sys/bus/edac.
 907          */
 908         name = kasprintf(GFP_KERNEL, "mc%d", mci->mc_idx);
 909         if (!name)
 910                 return -ENOMEM;
 911
 912         mci->bus->name = name;
 913
 914         edac_dbg(0, "creating bus %s\n", mci->bus->name);
 915
 916         err = bus_register(mci->bus);
 917         if (err < 0) {
 918                 kfree(name);
 919                 return err;
 920         }
 921
 922         /* get the /sys/devices/system/edac subsys reference */
 923         mci->dev.type = &mci_attr_type;
 924         device_initialize(&mci->dev);
 925
 926         mci->dev.parent = mci_pdev;
 927         mci->dev.bus = mci->bus;
 928         mci->dev.groups = groups;
 929         dev_set_name(&mci->dev, "mc%d", mci->mc_idx);
 930         dev_set_drvdata(&mci->dev, mci);
 931         pm_runtime_forbid(&mci->dev);
 932
 933         edac_dbg(0, "creating device %s\n", dev_name(&mci->dev));
 934         err = device_add(&mci->dev);
 935         if (err < 0) {
 936                 edac_dbg(1, "failure: create device %s\n", dev_name(&mci->dev));
 937                 goto fail_unregister_bus;
 938         }
 939
 940         /*
 941          * Create the dimm/rank devices
 942          */
 943         for (i = 0; i < mci->tot_dimms; i++) {
 944                 struct dimm_info *dimm = mci->dimms[i];
 945                 /* Only expose populated DIMMs */
 946                 if (!dimm->nr_pages)
 947                         continue;
 948
 949 #ifdef CONFIG_EDAC_DEBUG
 950                 edac_dbg(1, "creating dimm%d, located at ", i);
 951                 if (edac_debug_level >= 1) {
 952                         int lay;
 953                         for (lay = 0; lay < mci->n_layers; lay++)
 954                                 printk(KERN_CONT "%s %d ",
 955                                         edac_layer_name[mci->layers[lay].type],
 956                                         dimm->location[lay]);
 957                         printk(KERN_CONT "\n");
 958                 }
 959 #endif
 960                 err = edac_create_dimm_object(mci, dimm, i);
 961                 if (err) {
 962                         edac_dbg(1, "failure: create dimm %d obj\n", i);
 963                         goto fail_unregister_dimm;
 964                 }
 965         }
 966
 967 #ifdef CONFIG_EDAC_LEGACY_SYSFS
 968         err = edac_create_csrow_objects(mci);
 969         if (err < 0)
 970                 goto fail_unregister_dimm;
 971 #endif
 972
 973         edac_create_debugfs_nodes(mci);
 974         return 0;
 975
 976 fail_unregister_dimm:
 977         for (i--; i >= 0; i--) {
 978                 struct dimm_info *dimm = mci->dimms[i];
 979                 if (!dimm->nr_pages)
 980                         continue;
 981
 982                 device_unregister(&dimm->dev);
 983         }
 984         device_unregister(&mci->dev);
 985 fail_unregister_bus:
 986         bus_unregister(mci->bus);
 987         kfree(name);
 988
 989         return err;
 990 }
 991
 992 /*
 993  * remove a Memory Controller instance
 994  */
 995 void edac_remove_sysfs_mci_device(struct mem_ctl_info *mci)
 996 {
 997         int i;
 998
 999         edac_dbg(0, "\n");
1000
1001 #ifdef CONFIG_EDAC_DEBUG
1002         edac_debugfs_remove_recursive(mci->debugfs);
1003 #endif
1004 #ifdef CONFIG_EDAC_LEGACY_SYSFS
1005         edac_delete_csrow_objects(mci);
1006 #endif
1007
1008         for (i = 0; i < mci->tot_dimms; i++) {
1009                 struct dimm_info *dimm = mci->dimms[i];
1010                 if (dimm->nr_pages == 0)
1011                         continue;
1012                 edac_dbg(0, "removing device %s\n", dev_name(&dimm->dev));
1013                 device_unregister(&dimm->dev);
1014         }
1015 }
1016
1017 void edac_unregister_sysfs(struct mem_ctl_info *mci)
1018 {
1019         struct bus_type *bus = mci->bus;
1020         const char *name = mci->bus->name;
1021
1022         edac_dbg(1, "Unregistering device %s\n", dev_name(&mci->dev));
1023         device_unregister(&mci->dev);
1024         bus_unregister(bus);
1025         kfree(name);
1026 }
1027
1028 static void mc_attr_release(struct device *dev)
1029 {
1030         /*
1031          * There's no container structure here, as this is just the mci
1032          * parent device, used to create the /sys/devices/mc sysfs node.
1033          * So, there are no attributes on it.
1034          */
1035         edac_dbg(1, "Releasing device %s\n", dev_name(dev));
1036         kfree(dev);
1037 }
1038
1039 static struct device_type mc_attr_type = {
1040         .release        = mc_attr_release,
1041 };
1042 /*
1043  * Init/exit code for the module. Basically, creates/removes /sys/class/rc
1044  */
1045 int __init edac_mc_sysfs_init(void)
1046 {
1047         int err;
1048
1049         mci_pdev = kzalloc(sizeof(*mci_pdev), GFP_KERNEL);
1050         if (!mci_pdev) {
1051                 err = -ENOMEM;
1052                 goto out;
1053         }
1054
1055         mci_pdev->bus = edac_get_sysfs_subsys();
1056         mci_pdev->type = &mc_attr_type;
1057         device_initialize(mci_pdev);
1058         dev_set_name(mci_pdev, "mc");
1059
1060         err = device_add(mci_pdev);
1061         if (err < 0)
1062                 goto out_dev_free;
1063
1064         edac_dbg(0, "device %s created\n", dev_name(mci_pdev));
1065
1066         return 0;
1067
1068  out_dev_free:
1069         kfree(mci_pdev);
1070  out:
1071         return err;
1072 }
1073
1074 void edac_mc_sysfs_exit(void)
1075 {
1076         device_unregister(mci_pdev);
1077 }