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 - Mauro Carvalho Chehab <mchehab@redhat.com>
  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         long l;
  56         int ret;
  57
  58         if (!val)
  59                 return -EINVAL;
  60
  61         ret = strict_strtol(val, 0, &l);
  62         if (ret == -EINVAL || ((int)l != l))
  63                 return -EINVAL;
  64         *((int *)kp->arg) = l;
  65
  66         /* notify edac_mc engine to reset the poll period */
  67         edac_mc_reset_delay_period(l);
  68
  69         return 0;
  70 }
  71
  72 /* Parameter declarations for above */
  73 module_param(edac_mc_panic_on_ue, int, 0644);
  74 MODULE_PARM_DESC(edac_mc_panic_on_ue, "Panic on uncorrected error: 0=off 1=on");
  75 module_param(edac_mc_log_ue, int, 0644);
  76 MODULE_PARM_DESC(edac_mc_log_ue,
  77                  "Log uncorrectable error to console: 0=off 1=on");
  78 module_param(edac_mc_log_ce, int, 0644);
  79 MODULE_PARM_DESC(edac_mc_log_ce,
  80                  "Log correctable error to console: 0=off 1=on");
  81 module_param_call(edac_mc_poll_msec, edac_set_poll_msec, param_get_int,
  82                   &edac_mc_poll_msec, 0644);
  83 MODULE_PARM_DESC(edac_mc_poll_msec, "Polling period in milliseconds");
  84
  85 static struct device *mci_pdev;
  86
  87 /*
  88  * various constants for Memory Controllers
  89  */
  90 static const char *mem_types[] = {
  91         [MEM_EMPTY] = "Empty",
  92         [MEM_RESERVED] = "Reserved",
  93         [MEM_UNKNOWN] = "Unknown",
  94         [MEM_FPM] = "FPM",
  95         [MEM_EDO] = "EDO",
  96         [MEM_BEDO] = "BEDO",
  97         [MEM_SDR] = "Unbuffered-SDR",
  98         [MEM_RDR] = "Registered-SDR",
  99         [MEM_DDR] = "Unbuffered-DDR",
 100         [MEM_RDDR] = "Registered-DDR",
 101         [MEM_RMBS] = "RMBS",
 102         [MEM_DDR2] = "Unbuffered-DDR2",
 103         [MEM_FB_DDR2] = "FullyBuffered-DDR2",
 104         [MEM_RDDR2] = "Registered-DDR2",
 105         [MEM_XDR] = "XDR",
 106         [MEM_DDR3] = "Unbuffered-DDR3",
 107         [MEM_RDDR3] = "Registered-DDR3"
 108 };
 109
 110 static const char *dev_types[] = {
 111         [DEV_UNKNOWN] = "Unknown",
 112         [DEV_X1] = "x1",
 113         [DEV_X2] = "x2",
 114         [DEV_X4] = "x4",
 115         [DEV_X8] = "x8",
 116         [DEV_X16] = "x16",
 117         [DEV_X32] = "x32",
 118         [DEV_X64] = "x64"
 119 };
 120
 121 static const char *edac_caps[] = {
 122         [EDAC_UNKNOWN] = "Unknown",
 123         [EDAC_NONE] = "None",
 124         [EDAC_RESERVED] = "Reserved",
 125         [EDAC_PARITY] = "PARITY",
 126         [EDAC_EC] = "EC",
 127         [EDAC_SECDED] = "SECDED",
 128         [EDAC_S2ECD2ED] = "S2ECD2ED",
 129         [EDAC_S4ECD4ED] = "S4ECD4ED",
 130         [EDAC_S8ECD8ED] = "S8ECD8ED",
 131         [EDAC_S16ECD16ED] = "S16ECD16ED"
 132 };
 133
 134 #ifdef CONFIG_EDAC_LEGACY_SYSFS
 135 /*
 136  * EDAC sysfs CSROW data structures and methods
 137  */
 138
 139 #define to_csrow(k) container_of(k, struct csrow_info, dev)
 140
 141 /*
 142  * We need it to avoid namespace conflicts between the legacy API
 143  * and the per-dimm/per-rank one
 144  */
 145 #define DEVICE_ATTR_LEGACY(_name, _mode, _show, _store) \
 146         struct device_attribute dev_attr_legacy_##_name = __ATTR(_name, _mode, _show, _store)
 147
 148 struct dev_ch_attribute {
 149         struct device_attribute attr;
 150         int channel;
 151 };
 152
 153 #define DEVICE_CHANNEL(_name, _mode, _show, _store, _var) \
 154         struct dev_ch_attribute dev_attr_legacy_##_name = \
 155                 { __ATTR(_name, _mode, _show, _store), (_var) }
 156
 157 #define to_channel(k) (container_of(k, struct dev_ch_attribute, attr)->channel)
 158
 159 /* Set of more default csrow<id> attribute show/store functions */
 160 static ssize_t csrow_ue_count_show(struct device *dev,
 161                                    struct device_attribute *mattr, char *data)
 162 {
 163         struct csrow_info *csrow = to_csrow(dev);
 164
 165         return sprintf(data, "%u\n", csrow->ue_count);
 166 }
 167
 168 static ssize_t csrow_ce_count_show(struct device *dev,
 169                                    struct device_attribute *mattr, char *data)
 170 {
 171         struct csrow_info *csrow = to_csrow(dev);
 172
 173         return sprintf(data, "%u\n", csrow->ce_count);
 174 }
 175
 176 static ssize_t csrow_size_show(struct device *dev,
 177                                struct device_attribute *mattr, char *data)
 178 {
 179         struct csrow_info *csrow = to_csrow(dev);
 180         int i;
 181         u32 nr_pages = 0;
 182
 183         for (i = 0; i < csrow->nr_channels; i++)
 184                 nr_pages += csrow->channels[i]->dimm->nr_pages;
 185         return sprintf(data, "%u\n", PAGES_TO_MiB(nr_pages));
 186 }
 187
 188 static ssize_t csrow_mem_type_show(struct device *dev,
 189                                    struct device_attribute *mattr, char *data)
 190 {
 191         struct csrow_info *csrow = to_csrow(dev);
 192
 193         return sprintf(data, "%s\n", mem_types[csrow->channels[0]->dimm->mtype]);
 194 }
 195
 196 static ssize_t csrow_dev_type_show(struct device *dev,
 197                                    struct device_attribute *mattr, char *data)
 198 {
 199         struct csrow_info *csrow = to_csrow(dev);
 200
 201         return sprintf(data, "%s\n", dev_types[csrow->channels[0]->dimm->dtype]);
 202 }
 203
 204 static ssize_t csrow_edac_mode_show(struct device *dev,
 205                                     struct device_attribute *mattr,
 206                                     char *data)
 207 {
 208         struct csrow_info *csrow = to_csrow(dev);
 209
 210         return sprintf(data, "%s\n", edac_caps[csrow->channels[0]->dimm->edac_mode]);
 211 }
 212
 213 /* show/store functions for DIMM Label attributes */
 214 static ssize_t channel_dimm_label_show(struct device *dev,
 215                                        struct device_attribute *mattr,
 216                                        char *data)
 217 {
 218         struct csrow_info *csrow = to_csrow(dev);
 219         unsigned chan = to_channel(mattr);
 220         struct rank_info *rank = csrow->channels[chan];
 221
 222         /* if field has not been initialized, there is nothing to send */
 223         if (!rank->dimm->label[0])
 224                 return 0;
 225
 226         return snprintf(data, EDAC_MC_LABEL_LEN, "%s\n",
 227                         rank->dimm->label);
 228 }
 229
 230 static ssize_t channel_dimm_label_store(struct device *dev,
 231                                         struct device_attribute *mattr,
 232                                         const char *data, size_t count)
 233 {
 234         struct csrow_info *csrow = to_csrow(dev);
 235         unsigned chan = to_channel(mattr);
 236         struct rank_info *rank = csrow->channels[chan];
 237
 238         ssize_t max_size = 0;
 239
 240         max_size = min((ssize_t) count, (ssize_t) EDAC_MC_LABEL_LEN - 1);
 241         strncpy(rank->dimm->label, data, max_size);
 242         rank->dimm->label[max_size] = '\0';
 243
 244         return max_size;
 245 }
 246
 247 /* show function for dynamic chX_ce_count attribute */
 248 static ssize_t channel_ce_count_show(struct device *dev,
 249                                      struct device_attribute *mattr, char *data)
 250 {
 251         struct csrow_info *csrow = to_csrow(dev);
 252         unsigned chan = to_channel(mattr);
 253         struct rank_info *rank = csrow->channels[chan];
 254
 255         return sprintf(data, "%u\n", rank->ce_count);
 256 }
 257
 258 /* cwrow<id>/attribute files */
 259 DEVICE_ATTR_LEGACY(size_mb, S_IRUGO, csrow_size_show, NULL);
 260 DEVICE_ATTR_LEGACY(dev_type, S_IRUGO, csrow_dev_type_show, NULL);
 261 DEVICE_ATTR_LEGACY(mem_type, S_IRUGO, csrow_mem_type_show, NULL);
 262 DEVICE_ATTR_LEGACY(edac_mode, S_IRUGO, csrow_edac_mode_show, NULL);
 263 DEVICE_ATTR_LEGACY(ue_count, S_IRUGO, csrow_ue_count_show, NULL);
 264 DEVICE_ATTR_LEGACY(ce_count, S_IRUGO, csrow_ce_count_show, NULL);
 265
 266 /* default attributes of the CSROW<id> object */
 267 static struct attribute *csrow_attrs[] = {
 268         &dev_attr_legacy_dev_type.attr,
 269         &dev_attr_legacy_mem_type.attr,
 270         &dev_attr_legacy_edac_mode.attr,
 271         &dev_attr_legacy_size_mb.attr,
 272         &dev_attr_legacy_ue_count.attr,
 273         &dev_attr_legacy_ce_count.attr,
 274         NULL,
 275 };
 276
 277 static struct attribute_group csrow_attr_grp = {
 278         .attrs  = csrow_attrs,
 279 };
 280
 281 static const struct attribute_group *csrow_attr_groups[] = {
 282         &csrow_attr_grp,
 283         NULL
 284 };
 285
 286 static void csrow_attr_release(struct device *dev)
 287 {
 288         struct csrow_info *csrow = container_of(dev, struct csrow_info, dev);
 289
 290         debugf1("Releasing csrow device %s\n", dev_name(dev));
 291         kfree(csrow);
 292 }
 293
 294 static struct device_type csrow_attr_type = {
 295         .groups         = csrow_attr_groups,
 296         .release        = csrow_attr_release,
 297 };
 298
 299 /*
 300  * possible dynamic channel DIMM Label attribute files
 301  *
 302  */
 303
 304 #define EDAC_NR_CHANNELS        6
 305
 306 DEVICE_CHANNEL(ch0_dimm_label, S_IRUGO | S_IWUSR,
 307         channel_dimm_label_show, channel_dimm_label_store, 0);
 308 DEVICE_CHANNEL(ch1_dimm_label, S_IRUGO | S_IWUSR,
 309         channel_dimm_label_show, channel_dimm_label_store, 1);
 310 DEVICE_CHANNEL(ch2_dimm_label, S_IRUGO | S_IWUSR,
 311         channel_dimm_label_show, channel_dimm_label_store, 2);
 312 DEVICE_CHANNEL(ch3_dimm_label, S_IRUGO | S_IWUSR,
 313         channel_dimm_label_show, channel_dimm_label_store, 3);
 314 DEVICE_CHANNEL(ch4_dimm_label, S_IRUGO | S_IWUSR,
 315         channel_dimm_label_show, channel_dimm_label_store, 4);
 316 DEVICE_CHANNEL(ch5_dimm_label, S_IRUGO | S_IWUSR,
 317         channel_dimm_label_show, channel_dimm_label_store, 5);
 318
 319 /* Total possible dynamic DIMM Label attribute file table */
 320 static struct device_attribute *dynamic_csrow_dimm_attr[] = {
 321         &dev_attr_legacy_ch0_dimm_label.attr,
 322         &dev_attr_legacy_ch1_dimm_label.attr,
 323         &dev_attr_legacy_ch2_dimm_label.attr,
 324         &dev_attr_legacy_ch3_dimm_label.attr,
 325         &dev_attr_legacy_ch4_dimm_label.attr,
 326         &dev_attr_legacy_ch5_dimm_label.attr
 327 };
 328
 329 /* possible dynamic channel ce_count attribute files */
 330 DEVICE_CHANNEL(ch0_ce_count, S_IRUGO | S_IWUSR,
 331                    channel_ce_count_show, NULL, 0);
 332 DEVICE_CHANNEL(ch1_ce_count, S_IRUGO | S_IWUSR,
 333                    channel_ce_count_show, NULL, 1);
 334 DEVICE_CHANNEL(ch2_ce_count, S_IRUGO | S_IWUSR,
 335                    channel_ce_count_show, NULL, 2);
 336 DEVICE_CHANNEL(ch3_ce_count, S_IRUGO | S_IWUSR,
 337                    channel_ce_count_show, NULL, 3);
 338 DEVICE_CHANNEL(ch4_ce_count, S_IRUGO | S_IWUSR,
 339                    channel_ce_count_show, NULL, 4);
 340 DEVICE_CHANNEL(ch5_ce_count, S_IRUGO | S_IWUSR,
 341                    channel_ce_count_show, NULL, 5);
 342
 343 /* Total possible dynamic ce_count attribute file table */
 344 static struct device_attribute *dynamic_csrow_ce_count_attr[] = {
 345         &dev_attr_legacy_ch0_ce_count.attr,
 346         &dev_attr_legacy_ch1_ce_count.attr,
 347         &dev_attr_legacy_ch2_ce_count.attr,
 348         &dev_attr_legacy_ch3_ce_count.attr,
 349         &dev_attr_legacy_ch4_ce_count.attr,
 350         &dev_attr_legacy_ch5_ce_count.attr
 351 };
 352
 353 static inline int nr_pages_per_csrow(struct csrow_info *csrow)
 354 {
 355         int chan, nr_pages = 0;
 356
 357         for (chan = 0; chan < csrow->nr_channels; chan++)
 358                 nr_pages += csrow->channels[chan]->dimm->nr_pages;
 359
 360         return nr_pages;
 361 }
 362
 363 /* Create a CSROW object under specifed edac_mc_device */
 364 static int edac_create_csrow_object(struct mem_ctl_info *mci,
 365                                     struct csrow_info *csrow, int index)
 366 {
 367         int err, chan;
 368
 369         if (csrow->nr_channels >= EDAC_NR_CHANNELS)
 370                 return -ENODEV;
 371
 372         csrow->dev.type = &csrow_attr_type;
 373         csrow->dev.bus = &mci->bus;
 374         device_initialize(&csrow->dev);
 375         csrow->dev.parent = &mci->dev;
 376         dev_set_name(&csrow->dev, "csrow%d", index);
 377         dev_set_drvdata(&csrow->dev, csrow);
 378
 379         debugf0("creating (virtual) csrow node %s\n", dev_name(&csrow->dev));
 380
 381         err = device_add(&csrow->dev);
 382         if (err < 0)
 383                 return err;
 384
 385         for (chan = 0; chan < csrow->nr_channels; chan++) {
 386                 /* Only expose populated DIMMs */
 387                 if (!csrow->channels[chan]->dimm->nr_pages)
 388                         continue;
 389                 err = device_create_file(&csrow->dev,
 390                                          dynamic_csrow_dimm_attr[chan]);
 391                 if (err < 0)
 392                         goto error;
 393                 err = device_create_file(&csrow->dev,
 394                                          dynamic_csrow_ce_count_attr[chan]);
 395                 if (err < 0) {
 396                         device_remove_file(&csrow->dev,
 397                                            dynamic_csrow_dimm_attr[chan]);
 398                         goto error;
 399                 }
 400         }
 401
 402         return 0;
 403
 404 error:
 405         for (--chan; chan >= 0; chan--) {
 406                 device_remove_file(&csrow->dev,
 407                                         dynamic_csrow_dimm_attr[chan]);
 408                 device_remove_file(&csrow->dev,
 409                                            dynamic_csrow_ce_count_attr[chan]);
 410         }
 411         put_device(&csrow->dev);
 412
 413         return err;
 414 }
 415
 416 /* Create a CSROW object under specifed edac_mc_device */
 417 static int edac_create_csrow_objects(struct mem_ctl_info *mci)
 418 {
 419         int err, i, chan;
 420         struct csrow_info *csrow;
 421
 422         for (i = 0; i < mci->nr_csrows; i++) {
 423                 csrow = mci->csrows[i];
 424                 if (!nr_pages_per_csrow(csrow))
 425                         continue;
 426                 err = edac_create_csrow_object(mci, mci->csrows[i], i);
 427                 if (err < 0)
 428                         goto error;
 429         }
 430         return 0;
 431
 432 error:
 433         for (--i; i >= 0; i--) {
 434                 csrow = mci->csrows[i];
 435                 if (!nr_pages_per_csrow(csrow))
 436                         continue;
 437                 for (chan = csrow->nr_channels - 1; chan >= 0; chan--) {
 438                         if (!csrow->channels[chan]->dimm->nr_pages)
 439                                 continue;
 440                         device_remove_file(&csrow->dev,
 441                                                 dynamic_csrow_dimm_attr[chan]);
 442                         device_remove_file(&csrow->dev,
 443                                                 dynamic_csrow_ce_count_attr[chan]);
 444                 }
 445                 put_device(&mci->csrows[i]->dev);
 446         }
 447
 448         return err;
 449 }
 450
 451 static void edac_delete_csrow_objects(struct mem_ctl_info *mci)
 452 {
 453         int i, chan;
 454         struct csrow_info *csrow;
 455
 456         for (i = mci->nr_csrows - 1; i >= 0; i--) {
 457                 csrow = mci->csrows[i];
 458                 if (!nr_pages_per_csrow(csrow))
 459                         continue;
 460                 for (chan = csrow->nr_channels - 1; chan >= 0; chan--) {
 461                         if (!csrow->channels[chan]->dimm->nr_pages)
 462                                 continue;
 463                         debugf1("Removing csrow %d channel %d sysfs nodes\n",
 464                                 i, chan);
 465                         device_remove_file(&csrow->dev,
 466                                                 dynamic_csrow_dimm_attr[chan]);
 467                         device_remove_file(&csrow->dev,
 468                                                 dynamic_csrow_ce_count_attr[chan]);
 469                 }
 470                 put_device(&mci->csrows[i]->dev);
 471                 device_del(&mci->csrows[i]->dev);
 472         }
 473 }
 474 #endif
 475
 476 /*
 477  * Per-dimm (or per-rank) devices
 478  */
 479
 480 #define to_dimm(k) container_of(k, struct dimm_info, dev)
 481
 482 /* show/store functions for DIMM Label attributes */
 483 static ssize_t dimmdev_location_show(struct device *dev,
 484                                      struct device_attribute *mattr, char *data)
 485 {
 486         struct dimm_info *dimm = to_dimm(dev);
 487         struct mem_ctl_info *mci = dimm->mci;
 488         int i;
 489         char *p = data;
 490
 491         for (i = 0; i < mci->n_layers; i++) {
 492                 p += sprintf(p, "%s %d ",
 493                              edac_layer_name[mci->layers[i].type],
 494                              dimm->location[i]);
 495         }
 496
 497         return p - data;
 498 }
 499
 500 static ssize_t dimmdev_label_show(struct device *dev,
 501                                   struct device_attribute *mattr, char *data)
 502 {
 503         struct dimm_info *dimm = to_dimm(dev);
 504
 505         /* if field has not been initialized, there is nothing to send */
 506         if (!dimm->label[0])
 507                 return 0;
 508
 509         return snprintf(data, EDAC_MC_LABEL_LEN, "%s\n", dimm->label);
 510 }
 511
 512 static ssize_t dimmdev_label_store(struct device *dev,
 513                                    struct device_attribute *mattr,
 514                                    const char *data,
 515                                    size_t count)
 516 {
 517         struct dimm_info *dimm = to_dimm(dev);
 518
 519         ssize_t max_size = 0;
 520
 521         max_size = min((ssize_t) count, (ssize_t) EDAC_MC_LABEL_LEN - 1);
 522         strncpy(dimm->label, data, max_size);
 523         dimm->label[max_size] = '\0';
 524
 525         return max_size;
 526 }
 527
 528 static ssize_t dimmdev_size_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, "%u\n", PAGES_TO_MiB(dimm->nr_pages));
 534 }
 535
 536 static ssize_t dimmdev_mem_type_show(struct device *dev,
 537                                      struct device_attribute *mattr, char *data)
 538 {
 539         struct dimm_info *dimm = to_dimm(dev);
 540
 541         return sprintf(data, "%s\n", mem_types[dimm->mtype]);
 542 }
 543
 544 static ssize_t dimmdev_dev_type_show(struct device *dev,
 545                                      struct device_attribute *mattr, char *data)
 546 {
 547         struct dimm_info *dimm = to_dimm(dev);
 548
 549         return sprintf(data, "%s\n", dev_types[dimm->dtype]);
 550 }
 551
 552 static ssize_t dimmdev_edac_mode_show(struct device *dev,
 553                                       struct device_attribute *mattr,
 554                                       char *data)
 555 {
 556         struct dimm_info *dimm = to_dimm(dev);
 557
 558         return sprintf(data, "%s\n", edac_caps[dimm->edac_mode]);
 559 }
 560
 561 /* dimm/rank attribute files */
 562 static DEVICE_ATTR(dimm_label, S_IRUGO | S_IWUSR,
 563                    dimmdev_label_show, dimmdev_label_store);
 564 static DEVICE_ATTR(dimm_location, S_IRUGO, dimmdev_location_show, NULL);
 565 static DEVICE_ATTR(size, S_IRUGO, dimmdev_size_show, NULL);
 566 static DEVICE_ATTR(dimm_mem_type, S_IRUGO, dimmdev_mem_type_show, NULL);
 567 static DEVICE_ATTR(dimm_dev_type, S_IRUGO, dimmdev_dev_type_show, NULL);
 568 static DEVICE_ATTR(dimm_edac_mode, S_IRUGO, dimmdev_edac_mode_show, NULL);
 569
 570 /* attributes of the dimm<id>/rank<id> object */
 571 static struct attribute *dimm_attrs[] = {
 572         &dev_attr_dimm_label.attr,
 573         &dev_attr_dimm_location.attr,
 574         &dev_attr_size.attr,
 575         &dev_attr_dimm_mem_type.attr,
 576         &dev_attr_dimm_dev_type.attr,
 577         &dev_attr_dimm_edac_mode.attr,
 578         NULL,
 579 };
 580
 581 static struct attribute_group dimm_attr_grp = {
 582         .attrs  = dimm_attrs,
 583 };
 584
 585 static const struct attribute_group *dimm_attr_groups[] = {
 586         &dimm_attr_grp,
 587         NULL
 588 };
 589
 590 static void dimm_attr_release(struct device *dev)
 591 {
 592         struct dimm_info *dimm = container_of(dev, struct dimm_info, dev);
 593
 594         debugf1("Releasing dimm device %s\n", dev_name(dev));
 595         kfree(dimm);
 596 }
 597
 598 static struct device_type dimm_attr_type = {
 599         .groups         = dimm_attr_groups,
 600         .release        = dimm_attr_release,
 601 };
 602
 603 /* Create a DIMM object under specifed memory controller device */
 604 static int edac_create_dimm_object(struct mem_ctl_info *mci,
 605                                    struct dimm_info *dimm,
 606                                    int index)
 607 {
 608         int err;
 609         dimm->mci = mci;
 610
 611         dimm->dev.type = &dimm_attr_type;
 612         dimm->dev.bus = &mci->bus;
 613         device_initialize(&dimm->dev);
 614
 615         dimm->dev.parent = &mci->dev;
 616         if (mci->mem_is_per_rank)
 617                 dev_set_name(&dimm->dev, "rank%d", index);
 618         else
 619                 dev_set_name(&dimm->dev, "dimm%d", index);
 620         dev_set_drvdata(&dimm->dev, dimm);
 621         pm_runtime_forbid(&mci->dev);
 622
 623         err =  device_add(&dimm->dev);
 624
 625         debugf0("creating rank/dimm device %s\n", dev_name(&dimm->dev));
 626
 627         return err;
 628 }
 629
 630 /*
 631  * Memory controller device
 632  */
 633
 634 #define to_mci(k) container_of(k, struct mem_ctl_info, dev)
 635
 636 static ssize_t mci_reset_counters_store(struct device *dev,
 637                                         struct device_attribute *mattr,
 638                                         const char *data, size_t count)
 639 {
 640         struct mem_ctl_info *mci = to_mci(dev);
 641         int cnt, row, chan, i;
 642         mci->ue_mc = 0;
 643         mci->ce_mc = 0;
 644         mci->ue_noinfo_count = 0;
 645         mci->ce_noinfo_count = 0;
 646
 647         for (row = 0; row < mci->nr_csrows; row++) {
 648                 struct csrow_info *ri = mci->csrows[row];
 649
 650                 ri->ue_count = 0;
 651                 ri->ce_count = 0;
 652
 653                 for (chan = 0; chan < ri->nr_channels; chan++)
 654                         ri->channels[chan]->ce_count = 0;
 655         }
 656
 657         cnt = 1;
 658         for (i = 0; i < mci->n_layers; i++) {
 659                 cnt *= mci->layers[i].size;
 660                 memset(mci->ce_per_layer[i], 0, cnt * sizeof(u32));
 661                 memset(mci->ue_per_layer[i], 0, cnt * sizeof(u32));
 662         }
 663
 664         mci->start_time = jiffies;
 665         return count;
 666 }
 667
 668 /* Memory scrubbing interface:
 669  *
 670  * A MC driver can limit the scrubbing bandwidth based on the CPU type.
 671  * Therefore, ->set_sdram_scrub_rate should be made to return the actual
 672  * bandwidth that is accepted or 0 when scrubbing is to be disabled.
 673  *
 674  * Negative value still means that an error has occurred while setting
 675  * the scrub rate.
 676  */
 677 static ssize_t mci_sdram_scrub_rate_store(struct device *dev,
 678                                           struct device_attribute *mattr,
 679                                           const char *data, size_t count)
 680 {
 681         struct mem_ctl_info *mci = to_mci(dev);
 682         unsigned long bandwidth = 0;
 683         int new_bw = 0;
 684
 685         if (!mci->set_sdram_scrub_rate)
 686                 return -ENODEV;
 687
 688         if (strict_strtoul(data, 10, &bandwidth) < 0)
 689                 return -EINVAL;
 690
 691         new_bw = mci->set_sdram_scrub_rate(mci, bandwidth);
 692         if (new_bw < 0) {
 693                 edac_printk(KERN_WARNING, EDAC_MC,
 694                             "Error setting scrub rate to: %lu\n", bandwidth);
 695                 return -EINVAL;
 696         }
 697
 698         return count;
 699 }
 700
 701 /*
 702  * ->get_sdram_scrub_rate() return value semantics same as above.
 703  */
 704 static ssize_t mci_sdram_scrub_rate_show(struct device *dev,
 705                                          struct device_attribute *mattr,
 706                                          char *data)
 707 {
 708         struct mem_ctl_info *mci = to_mci(dev);
 709         int bandwidth = 0;
 710
 711         if (!mci->get_sdram_scrub_rate)
 712                 return -ENODEV;
 713
 714         bandwidth = mci->get_sdram_scrub_rate(mci);
 715         if (bandwidth < 0) {
 716                 edac_printk(KERN_DEBUG, EDAC_MC, "Error reading scrub rate\n");
 717                 return bandwidth;
 718         }
 719
 720         return sprintf(data, "%d\n", bandwidth);
 721 }
 722
 723 /* default attribute files for the MCI object */
 724 static ssize_t mci_ue_count_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_mc);
 731 }
 732
 733 static ssize_t mci_ce_count_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, "%d\n", mci->ce_mc);
 740 }
 741
 742 static ssize_t mci_ce_noinfo_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, "%d\n", mci->ce_noinfo_count);
 749 }
 750
 751 static ssize_t mci_ue_noinfo_show(struct device *dev,
 752                                   struct device_attribute *mattr,
 753                                   char *data)
 754 {
 755         struct mem_ctl_info *mci = to_mci(dev);
 756
 757         return sprintf(data, "%d\n", mci->ue_noinfo_count);
 758 }
 759
 760 static ssize_t mci_seconds_show(struct device *dev,
 761                                 struct device_attribute *mattr,
 762                                 char *data)
 763 {
 764         struct mem_ctl_info *mci = to_mci(dev);
 765
 766         return sprintf(data, "%ld\n", (jiffies - mci->start_time) / HZ);
 767 }
 768
 769 static ssize_t mci_ctl_name_show(struct device *dev,
 770                                  struct device_attribute *mattr,
 771                                  char *data)
 772 {
 773         struct mem_ctl_info *mci = to_mci(dev);
 774
 775         return sprintf(data, "%s\n", mci->ctl_name);
 776 }
 777
 778 static ssize_t mci_size_mb_show(struct device *dev,
 779                                 struct device_attribute *mattr,
 780                                 char *data)
 781 {
 782         struct mem_ctl_info *mci = to_mci(dev);
 783         int total_pages = 0, csrow_idx, j;
 784
 785         for (csrow_idx = 0; csrow_idx < mci->nr_csrows; csrow_idx++) {
 786                 struct csrow_info *csrow = mci->csrows[csrow_idx];
 787
 788                 for (j = 0; j < csrow->nr_channels; j++) {
 789                         struct dimm_info *dimm = csrow->channels[j]->dimm;
 790
 791                         total_pages += dimm->nr_pages;
 792                 }
 793         }
 794
 795         return sprintf(data, "%u\n", PAGES_TO_MiB(total_pages));
 796 }
 797
 798 static ssize_t mci_max_location_show(struct device *dev,
 799                                      struct device_attribute *mattr,
 800                                      char *data)
 801 {
 802         struct mem_ctl_info *mci = to_mci(dev);
 803         int i;
 804         char *p = data;
 805
 806         for (i = 0; i < mci->n_layers; i++) {
 807                 p += sprintf(p, "%s %d ",
 808                              edac_layer_name[mci->layers[i].type],
 809                              mci->layers[i].size - 1);
 810         }
 811
 812         return p - data;
 813 }
 814
 815 #ifdef CONFIG_EDAC_DEBUG
 816 static ssize_t edac_fake_inject_write(struct file *file,
 817                                       const char __user *data,
 818                                       size_t count, loff_t *ppos)
 819 {
 820         struct device *dev = file->private_data;
 821         struct mem_ctl_info *mci = to_mci(dev);
 822         static enum hw_event_mc_err_type type;
 823
 824         type = mci->fake_inject_ue ? HW_EVENT_ERR_UNCORRECTED
 825                                    : HW_EVENT_ERR_CORRECTED;
 826
 827         printk(KERN_DEBUG
 828                "Generating a %s fake error to %d.%d.%d to test core handling. NOTE: this won't test the driver-specific decoding logic.\n",
 829                 (type == HW_EVENT_ERR_UNCORRECTED) ? "UE" : "CE",
 830                 mci->fake_inject_layer[0],
 831                 mci->fake_inject_layer[1],
 832                 mci->fake_inject_layer[2]
 833                );
 834         edac_mc_handle_error(type, mci, 0, 0, 0,
 835                              mci->fake_inject_layer[0],
 836                              mci->fake_inject_layer[1],
 837                              mci->fake_inject_layer[2],
 838                              "FAKE ERROR", "for EDAC testing only", NULL);
 839
 840         return count;
 841 }
 842
 843 static int debugfs_open(struct inode *inode, struct file *file)
 844 {
 845         file->private_data = inode->i_private;
 846         return 0;
 847 }
 848
 849 static const struct file_operations debug_fake_inject_fops = {
 850         .open = debugfs_open,
 851         .write = edac_fake_inject_write,
 852         .llseek = generic_file_llseek,
 853 };
 854 #endif
 855
 856 /* default Control file */
 857 DEVICE_ATTR(reset_counters, S_IWUSR, NULL, mci_reset_counters_store);
 858
 859 /* default Attribute files */
 860 DEVICE_ATTR(mc_name, S_IRUGO, mci_ctl_name_show, NULL);
 861 DEVICE_ATTR(size_mb, S_IRUGO, mci_size_mb_show, NULL);
 862 DEVICE_ATTR(seconds_since_reset, S_IRUGO, mci_seconds_show, NULL);
 863 DEVICE_ATTR(ue_noinfo_count, S_IRUGO, mci_ue_noinfo_show, NULL);
 864 DEVICE_ATTR(ce_noinfo_count, S_IRUGO, mci_ce_noinfo_show, NULL);
 865 DEVICE_ATTR(ue_count, S_IRUGO, mci_ue_count_show, NULL);
 866 DEVICE_ATTR(ce_count, S_IRUGO, mci_ce_count_show, NULL);
 867 DEVICE_ATTR(max_location, S_IRUGO, mci_max_location_show, NULL);
 868
 869 /* memory scrubber attribute file */
 870 DEVICE_ATTR(sdram_scrub_rate, S_IRUGO | S_IWUSR, mci_sdram_scrub_rate_show,
 871         mci_sdram_scrub_rate_store);
 872
 873 static struct attribute *mci_attrs[] = {
 874         &dev_attr_reset_counters.attr,
 875         &dev_attr_mc_name.attr,
 876         &dev_attr_size_mb.attr,
 877         &dev_attr_seconds_since_reset.attr,
 878         &dev_attr_ue_noinfo_count.attr,
 879         &dev_attr_ce_noinfo_count.attr,
 880         &dev_attr_ue_count.attr,
 881         &dev_attr_ce_count.attr,
 882         &dev_attr_sdram_scrub_rate.attr,
 883         &dev_attr_max_location.attr,
 884         NULL
 885 };
 886
 887 static struct attribute_group mci_attr_grp = {
 888         .attrs  = mci_attrs,
 889 };
 890
 891 static const struct attribute_group *mci_attr_groups[] = {
 892         &mci_attr_grp,
 893         NULL
 894 };
 895
 896 static void mci_attr_release(struct device *dev)
 897 {
 898         struct mem_ctl_info *mci = container_of(dev, struct mem_ctl_info, dev);
 899
 900         debugf1("Releasing csrow device %s\n", dev_name(dev));
 901         kfree(mci);
 902 }
 903
 904 static struct device_type mci_attr_type = {
 905         .groups         = mci_attr_groups,
 906         .release        = mci_attr_release,
 907 };
 908
 909 #ifdef CONFIG_EDAC_DEBUG
 910 int edac_create_debug_nodes(struct mem_ctl_info *mci)
 911 {
 912         struct dentry *d, *parent;
 913         char name[80];
 914         int i;
 915
 916         d = debugfs_create_dir(mci->dev.kobj.name, mci->debugfs);
 917         if (!d)
 918                 return -ENOMEM;
 919         parent = d;
 920
 921         for (i = 0; i < mci->n_layers; i++) {
 922                 sprintf(name, "fake_inject_%s",
 923                              edac_layer_name[mci->layers[i].type]);
 924                 d = debugfs_create_u8(name, S_IRUGO | S_IWUSR, parent,
 925                                       &mci->fake_inject_layer[i]);
 926                 if (!d)
 927                         goto nomem;
 928         }
 929
 930         d = debugfs_create_bool("fake_inject_ue", S_IRUGO | S_IWUSR, parent,
 931                                 &mci->fake_inject_ue);
 932         if (!d)
 933                 goto nomem;
 934
 935         d = debugfs_create_file("fake_inject", S_IWUSR, parent,
 936                                 &mci->dev,
 937                                 &debug_fake_inject_fops);
 938         if (!d)
 939                 goto nomem;
 940
 941         return 0;
 942 nomem:
 943         debugfs_remove(mci->debugfs);
 944         return -ENOMEM;
 945 }
 946 #endif
 947
 948 /*
 949  * Create a new Memory Controller kobject instance,
 950  *      mc<id> under the 'mc' directory
 951  *
 952  * Return:
 953  *      0       Success
 954  *      !0      Failure
 955  */
 956 int edac_create_sysfs_mci_device(struct mem_ctl_info *mci)
 957 {
 958         int i, err;
 959
 960         /*
 961          * The memory controller needs its own bus, in order to avoid
 962          * namespace conflicts at /sys/bus/edac.
 963          */
 964         mci->bus.name = kasprintf(GFP_KERNEL, "mc%d", mci->mc_idx);
 965         if (!mci->bus.name)
 966                 return -ENOMEM;
 967         debugf0("creating bus %s\n",mci->bus.name);
 968         err = bus_register(&mci->bus);
 969         if (err < 0)
 970                 return err;
 971
 972         /* get the /sys/devices/system/edac subsys reference */
 973         mci->dev.type = &mci_attr_type;
 974         device_initialize(&mci->dev);
 975
 976         mci->dev.parent = mci_pdev;
 977         mci->dev.bus = &mci->bus;
 978         dev_set_name(&mci->dev, "mc%d", mci->mc_idx);
 979         dev_set_drvdata(&mci->dev, mci);
 980         pm_runtime_forbid(&mci->dev);
 981
 982         debugf0("creating device %s\n", dev_name(&mci->dev));
 983         err = device_add(&mci->dev);
 984         if (err < 0) {
 985                 bus_unregister(&mci->bus);
 986                 kfree(mci->bus.name);
 987                 return err;
 988         }
 989
 990         /*
 991          * Create the dimm/rank devices
 992          */
 993         for (i = 0; i < mci->tot_dimms; i++) {
 994                 struct dimm_info *dimm = mci->dimms[i];
 995                 /* Only expose populated DIMMs */
 996                 if (dimm->nr_pages == 0)
 997                         continue;
 998 #ifdef CONFIG_EDAC_DEBUG
 999                 debugf1("creating dimm%d, located at ",
1000                         i);
1001                 if (edac_debug_level >= 1) {
1002                         int lay;
1003                         for (lay = 0; lay < mci->n_layers; lay++)
1004                                 printk(KERN_CONT "%s %d ",
1005                                         edac_layer_name[mci->layers[lay].type],
1006                                         dimm->location[lay]);
1007                         printk(KERN_CONT "\n");
1008                 }
1009 #endif
1010                 err = edac_create_dimm_object(mci, dimm, i);
1011                 if (err) {
1012                         debugf1("failure: create dimm %d obj\n",
1013                                 i);
1014                         goto fail;
1015                 }
1016         }
1017
1018 #ifdef CONFIG_EDAC_LEGACY_SYSFS
1019         err = edac_create_csrow_objects(mci);
1020         if (err < 0)
1021                 goto fail;
1022 #endif
1023
1024 #ifdef CONFIG_EDAC_DEBUG
1025         edac_create_debug_nodes(mci);
1026 #endif
1027         return 0;
1028
1029 fail:
1030         for (i--; i >= 0; i--) {
1031                 struct dimm_info *dimm = mci->dimms[i];
1032                 if (dimm->nr_pages == 0)
1033                         continue;
1034                 put_device(&dimm->dev);
1035                 device_del(&dimm->dev);
1036         }
1037         put_device(&mci->dev);
1038         device_del(&mci->dev);
1039         bus_unregister(&mci->bus);
1040         kfree(mci->bus.name);
1041         return err;
1042 }
1043
1044 /*
1045  * remove a Memory Controller instance
1046  */
1047 void edac_remove_sysfs_mci_device(struct mem_ctl_info *mci)
1048 {
1049         int i;
1050
1051         debugf0("\n");
1052
1053 #ifdef CONFIG_EDAC_DEBUG
1054         debugfs_remove(mci->debugfs);
1055 #endif
1056 #ifdef CONFIG_EDAC_LEGACY_SYSFS
1057         edac_delete_csrow_objects(mci);
1058 #endif
1059
1060         for (i = 0; i < mci->tot_dimms; i++) {
1061                 struct dimm_info *dimm = mci->dimms[i];
1062                 if (dimm->nr_pages == 0)
1063                         continue;
1064                 debugf0("removing device %s\n", dev_name(&dimm->dev));
1065                 put_device(&dimm->dev);
1066                 device_del(&dimm->dev);
1067         }
1068 }
1069
1070 void edac_unregister_sysfs(struct mem_ctl_info *mci)
1071 {
1072         debugf1("Unregistering device %s\n", dev_name(&mci->dev));
1073         put_device(&mci->dev);
1074         device_del(&mci->dev);
1075         bus_unregister(&mci->bus);
1076         kfree(mci->bus.name);
1077 }
1078
1079 static void mc_attr_release(struct device *dev)
1080 {
1081         /*
1082          * There's no container structure here, as this is just the mci
1083          * parent device, used to create the /sys/devices/mc sysfs node.
1084          * So, there are no attributes on it.
1085          */
1086         debugf1("Releasing device %s\n", dev_name(dev));
1087         kfree(dev);
1088 }
1089
1090 static struct device_type mc_attr_type = {
1091         .release        = mc_attr_release,
1092 };
1093 /*
1094  * Init/exit code for the module. Basically, creates/removes /sys/class/rc
1095  */
1096 int __init edac_mc_sysfs_init(void)
1097 {
1098         struct bus_type *edac_subsys;
1099         int err;
1100
1101         /* get the /sys/devices/system/edac subsys reference */
1102         edac_subsys = edac_get_sysfs_subsys();
1103         if (edac_subsys == NULL) {
1104                 debugf1("no edac_subsys\n");
1105                 return -EINVAL;
1106         }
1107
1108         mci_pdev = kzalloc(sizeof(*mci_pdev), GFP_KERNEL);
1109
1110         mci_pdev->bus = edac_subsys;
1111         mci_pdev->type = &mc_attr_type;
1112         device_initialize(mci_pdev);
1113         dev_set_name(mci_pdev, "mc");
1114
1115         err = device_add(mci_pdev);
1116         if (err < 0)
1117                 return err;
1118
1119         debugf0("device %s created\n", dev_name(mci_pdev));
1120
1121         return 0;
1122 }
1123
1124 void __exit edac_mc_sysfs_exit(void)
1125 {
1126         put_device(mci_pdev);
1127         device_del(mci_pdev);
1128         edac_put_sysfs_subsys();
1129 }