linux/drivers/edac/edac_mc_sysfs.c
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   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 */
  26static int edac_mc_log_ue = 1;
  27static int edac_mc_log_ce = 1;
  28static int edac_mc_panic_on_ue;
  29static int edac_mc_poll_msec = 1000;
  30
  31/* Getter functions for above */
  32int edac_mc_get_log_ue(void)
  33{
  34        return edac_mc_log_ue;
  35}
  36
  37int edac_mc_get_log_ce(void)
  38{
  39        return edac_mc_log_ce;
  40}
  41
  42int edac_mc_get_panic_on_ue(void)
  43{
  44        return edac_mc_panic_on_ue;
  45}
  46
  47/* this is temporary */
  48int edac_mc_get_poll_msec(void)
  49{
  50        return edac_mc_poll_msec;
  51}
  52
  53static 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 */
  73module_param(edac_mc_panic_on_ue, int, 0644);
  74MODULE_PARM_DESC(edac_mc_panic_on_ue, "Panic on uncorrected error: 0=off 1=on");
  75module_param(edac_mc_log_ue, int, 0644);
  76MODULE_PARM_DESC(edac_mc_log_ue,
  77                 "Log uncorrectable error to console: 0=off 1=on");
  78module_param(edac_mc_log_ce, int, 0644);
  79MODULE_PARM_DESC(edac_mc_log_ce,
  80                 "Log correctable error to console: 0=off 1=on");
  81module_param_call(edac_mc_poll_msec, edac_set_poll_msec, param_get_int,
  82                  &edac_mc_poll_msec, 0644);
  83MODULE_PARM_DESC(edac_mc_poll_msec, "Polling period in milliseconds");
  84
  85static struct device *mci_pdev;
  86
  87/*
  88 * various constants for Memory Controllers
  89 */
  90static 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
 110static 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
 121static 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
 148struct 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 */
 160static 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
 168static 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
 176static 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        if (csrow->mci->csbased)
 184                return sprintf(data, "%u\n", PAGES_TO_MiB(csrow->nr_pages));
 185
 186        for (i = 0; i < csrow->nr_channels; i++)
 187                nr_pages += csrow->channels[i]->dimm->nr_pages;
 188        return sprintf(data, "%u\n", PAGES_TO_MiB(nr_pages));
 189}
 190
 191static ssize_t csrow_mem_type_show(struct device *dev,
 192                                   struct device_attribute *mattr, char *data)
 193{
 194        struct csrow_info *csrow = to_csrow(dev);
 195
 196        return sprintf(data, "%s\n", mem_types[csrow->channels[0]->dimm->mtype]);
 197}
 198
 199static ssize_t csrow_dev_type_show(struct device *dev,
 200                                   struct device_attribute *mattr, char *data)
 201{
 202        struct csrow_info *csrow = to_csrow(dev);
 203
 204        return sprintf(data, "%s\n", dev_types[csrow->channels[0]->dimm->dtype]);
 205}
 206
 207static ssize_t csrow_edac_mode_show(struct device *dev,
 208                                    struct device_attribute *mattr,
 209                                    char *data)
 210{
 211        struct csrow_info *csrow = to_csrow(dev);
 212
 213        return sprintf(data, "%s\n", edac_caps[csrow->channels[0]->dimm->edac_mode]);
 214}
 215
 216/* show/store functions for DIMM Label attributes */
 217static ssize_t channel_dimm_label_show(struct device *dev,
 218                                       struct device_attribute *mattr,
 219                                       char *data)
 220{
 221        struct csrow_info *csrow = to_csrow(dev);
 222        unsigned chan = to_channel(mattr);
 223        struct rank_info *rank = csrow->channels[chan];
 224
 225        /* if field has not been initialized, there is nothing to send */
 226        if (!rank->dimm->label[0])
 227                return 0;
 228
 229        return snprintf(data, EDAC_MC_LABEL_LEN, "%s\n",
 230                        rank->dimm->label);
 231}
 232
 233static ssize_t channel_dimm_label_store(struct device *dev,
 234                                        struct device_attribute *mattr,
 235                                        const char *data, size_t count)
 236{
 237        struct csrow_info *csrow = to_csrow(dev);
 238        unsigned chan = to_channel(mattr);
 239        struct rank_info *rank = csrow->channels[chan];
 240
 241        ssize_t max_size = 0;
 242
 243        max_size = min((ssize_t) count, (ssize_t) EDAC_MC_LABEL_LEN - 1);
 244        strncpy(rank->dimm->label, data, max_size);
 245        rank->dimm->label[max_size] = '\0';
 246
 247        return max_size;
 248}
 249
 250/* show function for dynamic chX_ce_count attribute */
 251static ssize_t channel_ce_count_show(struct device *dev,
 252                                     struct device_attribute *mattr, char *data)
 253{
 254        struct csrow_info *csrow = to_csrow(dev);
 255        unsigned chan = to_channel(mattr);
 256        struct rank_info *rank = csrow->channels[chan];
 257
 258        return sprintf(data, "%u\n", rank->ce_count);
 259}
 260
 261/* cwrow<id>/attribute files */
 262DEVICE_ATTR_LEGACY(size_mb, S_IRUGO, csrow_size_show, NULL);
 263DEVICE_ATTR_LEGACY(dev_type, S_IRUGO, csrow_dev_type_show, NULL);
 264DEVICE_ATTR_LEGACY(mem_type, S_IRUGO, csrow_mem_type_show, NULL);
 265DEVICE_ATTR_LEGACY(edac_mode, S_IRUGO, csrow_edac_mode_show, NULL);
 266DEVICE_ATTR_LEGACY(ue_count, S_IRUGO, csrow_ue_count_show, NULL);
 267DEVICE_ATTR_LEGACY(ce_count, S_IRUGO, csrow_ce_count_show, NULL);
 268
 269/* default attributes of the CSROW<id> object */
 270static struct attribute *csrow_attrs[] = {
 271        &dev_attr_legacy_dev_type.attr,
 272        &dev_attr_legacy_mem_type.attr,
 273        &dev_attr_legacy_edac_mode.attr,
 274        &dev_attr_legacy_size_mb.attr,
 275        &dev_attr_legacy_ue_count.attr,
 276        &dev_attr_legacy_ce_count.attr,
 277        NULL,
 278};
 279
 280static struct attribute_group csrow_attr_grp = {
 281        .attrs  = csrow_attrs,
 282};
 283
 284static const struct attribute_group *csrow_attr_groups[] = {
 285        &csrow_attr_grp,
 286        NULL
 287};
 288
 289static void csrow_attr_release(struct device *dev)
 290{
 291        struct csrow_info *csrow = container_of(dev, struct csrow_info, dev);
 292
 293        edac_dbg(1, "Releasing csrow device %s\n", dev_name(dev));
 294        kfree(csrow);
 295}
 296
 297static struct device_type csrow_attr_type = {
 298        .groups         = csrow_attr_groups,
 299        .release        = csrow_attr_release,
 300};
 301
 302/*
 303 * possible dynamic channel DIMM Label attribute files
 304 *
 305 */
 306
 307#define EDAC_NR_CHANNELS        6
 308
 309DEVICE_CHANNEL(ch0_dimm_label, S_IRUGO | S_IWUSR,
 310        channel_dimm_label_show, channel_dimm_label_store, 0);
 311DEVICE_CHANNEL(ch1_dimm_label, S_IRUGO | S_IWUSR,
 312        channel_dimm_label_show, channel_dimm_label_store, 1);
 313DEVICE_CHANNEL(ch2_dimm_label, S_IRUGO | S_IWUSR,
 314        channel_dimm_label_show, channel_dimm_label_store, 2);
 315DEVICE_CHANNEL(ch3_dimm_label, S_IRUGO | S_IWUSR,
 316        channel_dimm_label_show, channel_dimm_label_store, 3);
 317DEVICE_CHANNEL(ch4_dimm_label, S_IRUGO | S_IWUSR,
 318        channel_dimm_label_show, channel_dimm_label_store, 4);
 319DEVICE_CHANNEL(ch5_dimm_label, S_IRUGO | S_IWUSR,
 320        channel_dimm_label_show, channel_dimm_label_store, 5);
 321
 322/* Total possible dynamic DIMM Label attribute file table */
 323static struct device_attribute *dynamic_csrow_dimm_attr[] = {
 324        &dev_attr_legacy_ch0_dimm_label.attr,
 325        &dev_attr_legacy_ch1_dimm_label.attr,
 326        &dev_attr_legacy_ch2_dimm_label.attr,
 327        &dev_attr_legacy_ch3_dimm_label.attr,
 328        &dev_attr_legacy_ch4_dimm_label.attr,
 329        &dev_attr_legacy_ch5_dimm_label.attr
 330};
 331
 332/* possible dynamic channel ce_count attribute files */
 333DEVICE_CHANNEL(ch0_ce_count, S_IRUGO | S_IWUSR,
 334                   channel_ce_count_show, NULL, 0);
 335DEVICE_CHANNEL(ch1_ce_count, S_IRUGO | S_IWUSR,
 336                   channel_ce_count_show, NULL, 1);
 337DEVICE_CHANNEL(ch2_ce_count, S_IRUGO | S_IWUSR,
 338                   channel_ce_count_show, NULL, 2);
 339DEVICE_CHANNEL(ch3_ce_count, S_IRUGO | S_IWUSR,
 340                   channel_ce_count_show, NULL, 3);
 341DEVICE_CHANNEL(ch4_ce_count, S_IRUGO | S_IWUSR,
 342                   channel_ce_count_show, NULL, 4);
 343DEVICE_CHANNEL(ch5_ce_count, S_IRUGO | S_IWUSR,
 344                   channel_ce_count_show, NULL, 5);
 345
 346/* Total possible dynamic ce_count attribute file table */
 347static struct device_attribute *dynamic_csrow_ce_count_attr[] = {
 348        &dev_attr_legacy_ch0_ce_count.attr,
 349        &dev_attr_legacy_ch1_ce_count.attr,
 350        &dev_attr_legacy_ch2_ce_count.attr,
 351        &dev_attr_legacy_ch3_ce_count.attr,
 352        &dev_attr_legacy_ch4_ce_count.attr,
 353        &dev_attr_legacy_ch5_ce_count.attr
 354};
 355
 356static inline int nr_pages_per_csrow(struct csrow_info *csrow)
 357{
 358        int chan, nr_pages = 0;
 359
 360        for (chan = 0; chan < csrow->nr_channels; chan++)
 361                nr_pages += csrow->channels[chan]->dimm->nr_pages;
 362
 363        return nr_pages;
 364}
 365
 366/* Create a CSROW object under specifed edac_mc_device */
 367static int edac_create_csrow_object(struct mem_ctl_info *mci,
 368                                    struct csrow_info *csrow, int index)
 369{
 370        int err, chan;
 371
 372        if (csrow->nr_channels >= EDAC_NR_CHANNELS)
 373                return -ENODEV;
 374
 375        csrow->dev.type = &csrow_attr_type;
 376        csrow->dev.bus = &mci->bus;
 377        device_initialize(&csrow->dev);
 378        csrow->dev.parent = &mci->dev;
 379        csrow->mci = mci;
 380        dev_set_name(&csrow->dev, "csrow%d", index);
 381        dev_set_drvdata(&csrow->dev, csrow);
 382
 383        edac_dbg(0, "creating (virtual) csrow node %s\n",
 384                 dev_name(&csrow->dev));
 385
 386        err = device_add(&csrow->dev);
 387        if (err < 0)
 388                return err;
 389
 390        for (chan = 0; chan < csrow->nr_channels; chan++) {
 391                /* Only expose populated DIMMs */
 392                if (!csrow->channels[chan]->dimm->nr_pages)
 393                        continue;
 394                err = device_create_file(&csrow->dev,
 395                                         dynamic_csrow_dimm_attr[chan]);
 396                if (err < 0)
 397                        goto error;
 398                err = device_create_file(&csrow->dev,
 399                                         dynamic_csrow_ce_count_attr[chan]);
 400                if (err < 0) {
 401                        device_remove_file(&csrow->dev,
 402                                           dynamic_csrow_dimm_attr[chan]);
 403                        goto error;
 404                }
 405        }
 406
 407        return 0;
 408
 409error:
 410        for (--chan; chan >= 0; chan--) {
 411                device_remove_file(&csrow->dev,
 412                                        dynamic_csrow_dimm_attr[chan]);
 413                device_remove_file(&csrow->dev,
 414                                           dynamic_csrow_ce_count_attr[chan]);
 415        }
 416        put_device(&csrow->dev);
 417
 418        return err;
 419}
 420
 421/* Create a CSROW object under specifed edac_mc_device */
 422static int edac_create_csrow_objects(struct mem_ctl_info *mci)
 423{
 424        int err, i, chan;
 425        struct csrow_info *csrow;
 426
 427        for (i = 0; i < mci->nr_csrows; i++) {
 428                csrow = mci->csrows[i];
 429                if (!nr_pages_per_csrow(csrow))
 430                        continue;
 431                err = edac_create_csrow_object(mci, mci->csrows[i], i);
 432                if (err < 0)
 433                        goto error;
 434        }
 435        return 0;
 436
 437error:
 438        for (--i; i >= 0; i--) {
 439                csrow = mci->csrows[i];
 440                if (!nr_pages_per_csrow(csrow))
 441                        continue;
 442                for (chan = csrow->nr_channels - 1; chan >= 0; chan--) {
 443                        if (!csrow->channels[chan]->dimm->nr_pages)
 444                                continue;
 445                        device_remove_file(&csrow->dev,
 446                                                dynamic_csrow_dimm_attr[chan]);
 447                        device_remove_file(&csrow->dev,
 448                                                dynamic_csrow_ce_count_attr[chan]);
 449                }
 450                put_device(&mci->csrows[i]->dev);
 451        }
 452
 453        return err;
 454}
 455
 456static void edac_delete_csrow_objects(struct mem_ctl_info *mci)
 457{
 458        int i, chan;
 459        struct csrow_info *csrow;
 460
 461        for (i = mci->nr_csrows - 1; i >= 0; i--) {
 462                csrow = mci->csrows[i];
 463                if (!nr_pages_per_csrow(csrow))
 464                        continue;
 465                for (chan = csrow->nr_channels - 1; chan >= 0; chan--) {
 466                        if (!csrow->channels[chan]->dimm->nr_pages)
 467                                continue;
 468                        edac_dbg(1, "Removing csrow %d channel %d sysfs nodes\n",
 469                                 i, chan);
 470                        device_remove_file(&csrow->dev,
 471                                                dynamic_csrow_dimm_attr[chan]);
 472                        device_remove_file(&csrow->dev,
 473                                                dynamic_csrow_ce_count_attr[chan]);
 474                }
 475                device_unregister(&mci->csrows[i]->dev);
 476        }
 477}
 478#endif
 479
 480/*
 481 * Per-dimm (or per-rank) devices
 482 */
 483
 484#define to_dimm(k) container_of(k, struct dimm_info, dev)
 485
 486/* show/store functions for DIMM Label attributes */
 487static ssize_t dimmdev_location_show(struct device *dev,
 488                                     struct device_attribute *mattr, char *data)
 489{
 490        struct dimm_info *dimm = to_dimm(dev);
 491
 492        return edac_dimm_info_location(dimm, data, PAGE_SIZE);
 493}
 494
 495static ssize_t dimmdev_label_show(struct device *dev,
 496                                  struct device_attribute *mattr, char *data)
 497{
 498        struct dimm_info *dimm = to_dimm(dev);
 499
 500        /* if field has not been initialized, there is nothing to send */
 501        if (!dimm->label[0])
 502                return 0;
 503
 504        return snprintf(data, EDAC_MC_LABEL_LEN, "%s\n", dimm->label);
 505}
 506
 507static ssize_t dimmdev_label_store(struct device *dev,
 508                                   struct device_attribute *mattr,
 509                                   const char *data,
 510                                   size_t count)
 511{
 512        struct dimm_info *dimm = to_dimm(dev);
 513
 514        ssize_t max_size = 0;
 515
 516        max_size = min((ssize_t) count, (ssize_t) EDAC_MC_LABEL_LEN - 1);
 517        strncpy(dimm->label, data, max_size);
 518        dimm->label[max_size] = '\0';
 519
 520        return max_size;
 521}
 522
 523static ssize_t dimmdev_size_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, "%u\n", PAGES_TO_MiB(dimm->nr_pages));
 529}
 530
 531static ssize_t dimmdev_mem_type_show(struct device *dev,
 532                                     struct device_attribute *mattr, char *data)
 533{
 534        struct dimm_info *dimm = to_dimm(dev);
 535
 536        return sprintf(data, "%s\n", mem_types[dimm->mtype]);
 537}
 538
 539static ssize_t dimmdev_dev_type_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, "%s\n", dev_types[dimm->dtype]);
 545}
 546
 547static ssize_t dimmdev_edac_mode_show(struct device *dev,
 548                                      struct device_attribute *mattr,
 549                                      char *data)
 550{
 551        struct dimm_info *dimm = to_dimm(dev);
 552
 553        return sprintf(data, "%s\n", edac_caps[dimm->edac_mode]);
 554}
 555
 556/* dimm/rank attribute files */
 557static DEVICE_ATTR(dimm_label, S_IRUGO | S_IWUSR,
 558                   dimmdev_label_show, dimmdev_label_store);
 559static DEVICE_ATTR(dimm_location, S_IRUGO, dimmdev_location_show, NULL);
 560static DEVICE_ATTR(size, S_IRUGO, dimmdev_size_show, NULL);
 561static DEVICE_ATTR(dimm_mem_type, S_IRUGO, dimmdev_mem_type_show, NULL);
 562static DEVICE_ATTR(dimm_dev_type, S_IRUGO, dimmdev_dev_type_show, NULL);
 563static DEVICE_ATTR(dimm_edac_mode, S_IRUGO, dimmdev_edac_mode_show, NULL);
 564
 565/* attributes of the dimm<id>/rank<id> object */
 566static struct attribute *dimm_attrs[] = {
 567        &dev_attr_dimm_label.attr,
 568        &dev_attr_dimm_location.attr,
 569        &dev_attr_size.attr,
 570        &dev_attr_dimm_mem_type.attr,
 571        &dev_attr_dimm_dev_type.attr,
 572        &dev_attr_dimm_edac_mode.attr,
 573        NULL,
 574};
 575
 576static struct attribute_group dimm_attr_grp = {
 577        .attrs  = dimm_attrs,
 578};
 579
 580static const struct attribute_group *dimm_attr_groups[] = {
 581        &dimm_attr_grp,
 582        NULL
 583};
 584
 585static void dimm_attr_release(struct device *dev)
 586{
 587        struct dimm_info *dimm = container_of(dev, struct dimm_info, dev);
 588
 589        edac_dbg(1, "Releasing dimm device %s\n", dev_name(dev));
 590        kfree(dimm);
 591}
 592
 593static struct device_type dimm_attr_type = {
 594        .groups         = dimm_attr_groups,
 595        .release        = dimm_attr_release,
 596};
 597
 598/* Create a DIMM object under specifed memory controller device */
 599static int edac_create_dimm_object(struct mem_ctl_info *mci,
 600                                   struct dimm_info *dimm,
 601                                   int index)
 602{
 603        int err;
 604        dimm->mci = mci;
 605
 606        dimm->dev.type = &dimm_attr_type;
 607        dimm->dev.bus = &mci->bus;
 608        device_initialize(&dimm->dev);
 609
 610        dimm->dev.parent = &mci->dev;
 611        if (mci->mem_is_per_rank)
 612                dev_set_name(&dimm->dev, "rank%d", index);
 613        else
 614                dev_set_name(&dimm->dev, "dimm%d", index);
 615        dev_set_drvdata(&dimm->dev, dimm);
 616        pm_runtime_forbid(&mci->dev);
 617
 618        err =  device_add(&dimm->dev);
 619
 620        edac_dbg(0, "creating rank/dimm device %s\n", dev_name(&dimm->dev));
 621
 622        return err;
 623}
 624
 625/*
 626 * Memory controller device
 627 */
 628
 629#define to_mci(k) container_of(k, struct mem_ctl_info, dev)
 630
 631static ssize_t mci_reset_counters_store(struct device *dev,
 632                                        struct device_attribute *mattr,
 633                                        const char *data, size_t count)
 634{
 635        struct mem_ctl_info *mci = to_mci(dev);
 636        int cnt, row, chan, i;
 637        mci->ue_mc = 0;
 638        mci->ce_mc = 0;
 639        mci->ue_noinfo_count = 0;
 640        mci->ce_noinfo_count = 0;
 641
 642        for (row = 0; row < mci->nr_csrows; row++) {
 643                struct csrow_info *ri = mci->csrows[row];
 644
 645                ri->ue_count = 0;
 646                ri->ce_count = 0;
 647
 648                for (chan = 0; chan < ri->nr_channels; chan++)
 649                        ri->channels[chan]->ce_count = 0;
 650        }
 651
 652        cnt = 1;
 653        for (i = 0; i < mci->n_layers; i++) {
 654                cnt *= mci->layers[i].size;
 655                memset(mci->ce_per_layer[i], 0, cnt * sizeof(u32));
 656                memset(mci->ue_per_layer[i], 0, cnt * sizeof(u32));
 657        }
 658
 659        mci->start_time = jiffies;
 660        return count;
 661}
 662
 663/* Memory scrubbing interface:
 664 *
 665 * A MC driver can limit the scrubbing bandwidth based on the CPU type.
 666 * Therefore, ->set_sdram_scrub_rate should be made to return the actual
 667 * bandwidth that is accepted or 0 when scrubbing is to be disabled.
 668 *
 669 * Negative value still means that an error has occurred while setting
 670 * the scrub rate.
 671 */
 672static ssize_t mci_sdram_scrub_rate_store(struct device *dev,
 673                                          struct device_attribute *mattr,
 674                                          const char *data, size_t count)
 675{
 676        struct mem_ctl_info *mci = to_mci(dev);
 677        unsigned long bandwidth = 0;
 678        int new_bw = 0;
 679
 680        if (!mci->set_sdram_scrub_rate)
 681                return -ENODEV;
 682
 683        if (strict_strtoul(data, 10, &bandwidth) < 0)
 684                return -EINVAL;
 685
 686        new_bw = mci->set_sdram_scrub_rate(mci, bandwidth);
 687        if (new_bw < 0) {
 688                edac_printk(KERN_WARNING, EDAC_MC,
 689                            "Error setting scrub rate to: %lu\n", bandwidth);
 690                return -EINVAL;
 691        }
 692
 693        return count;
 694}
 695
 696/*
 697 * ->get_sdram_scrub_rate() return value semantics same as above.
 698 */
 699static ssize_t mci_sdram_scrub_rate_show(struct device *dev,
 700                                         struct device_attribute *mattr,
 701                                         char *data)
 702{
 703        struct mem_ctl_info *mci = to_mci(dev);
 704        int bandwidth = 0;
 705
 706        if (!mci->get_sdram_scrub_rate)
 707                return -ENODEV;
 708
 709        bandwidth = mci->get_sdram_scrub_rate(mci);
 710        if (bandwidth < 0) {
 711                edac_printk(KERN_DEBUG, EDAC_MC, "Error reading scrub rate\n");
 712                return bandwidth;
 713        }
 714
 715        return sprintf(data, "%d\n", bandwidth);
 716}
 717
 718/* default attribute files for the MCI object */
 719static ssize_t mci_ue_count_show(struct device *dev,
 720                                 struct device_attribute *mattr,
 721                                 char *data)
 722{
 723        struct mem_ctl_info *mci = to_mci(dev);
 724
 725        return sprintf(data, "%d\n", mci->ue_mc);
 726}
 727
 728static ssize_t mci_ce_count_show(struct device *dev,
 729                                 struct device_attribute *mattr,
 730                                 char *data)
 731{
 732        struct mem_ctl_info *mci = to_mci(dev);
 733
 734        return sprintf(data, "%d\n", mci->ce_mc);
 735}
 736
 737static ssize_t mci_ce_noinfo_show(struct device *dev,
 738                                  struct device_attribute *mattr,
 739                                  char *data)
 740{
 741        struct mem_ctl_info *mci = to_mci(dev);
 742
 743        return sprintf(data, "%d\n", mci->ce_noinfo_count);
 744}
 745
 746static ssize_t mci_ue_noinfo_show(struct device *dev,
 747                                  struct device_attribute *mattr,
 748                                  char *data)
 749{
 750        struct mem_ctl_info *mci = to_mci(dev);
 751
 752        return sprintf(data, "%d\n", mci->ue_noinfo_count);
 753}
 754
 755static ssize_t mci_seconds_show(struct device *dev,
 756                                struct device_attribute *mattr,
 757                                char *data)
 758{
 759        struct mem_ctl_info *mci = to_mci(dev);
 760
 761        return sprintf(data, "%ld\n", (jiffies - mci->start_time) / HZ);
 762}
 763
 764static ssize_t mci_ctl_name_show(struct device *dev,
 765                                 struct device_attribute *mattr,
 766                                 char *data)
 767{
 768        struct mem_ctl_info *mci = to_mci(dev);
 769
 770        return sprintf(data, "%s\n", mci->ctl_name);
 771}
 772
 773static ssize_t mci_size_mb_show(struct device *dev,
 774                                struct device_attribute *mattr,
 775                                char *data)
 776{
 777        struct mem_ctl_info *mci = to_mci(dev);
 778        int total_pages = 0, csrow_idx, j;
 779
 780        for (csrow_idx = 0; csrow_idx < mci->nr_csrows; csrow_idx++) {
 781                struct csrow_info *csrow = mci->csrows[csrow_idx];
 782
 783                if (csrow->mci->csbased) {
 784                        total_pages += csrow->nr_pages;
 785                } else {
 786                        for (j = 0; j < csrow->nr_channels; j++) {
 787                                struct dimm_info *dimm = csrow->channels[j]->dimm;
 788
 789                                total_pages += dimm->nr_pages;
 790                        }
 791                }
 792        }
 793
 794        return sprintf(data, "%u\n", PAGES_TO_MiB(total_pages));
 795}
 796
 797static ssize_t mci_max_location_show(struct device *dev,
 798                                     struct device_attribute *mattr,
 799                                     char *data)
 800{
 801        struct mem_ctl_info *mci = to_mci(dev);
 802        int i;
 803        char *p = data;
 804
 805        for (i = 0; i < mci->n_layers; i++) {
 806                p += sprintf(p, "%s %d ",
 807                             edac_layer_name[mci->layers[i].type],
 808                             mci->layers[i].size - 1);
 809        }
 810
 811        return p - data;
 812}
 813
 814#ifdef CONFIG_EDAC_DEBUG
 815static ssize_t edac_fake_inject_write(struct file *file,
 816                                      const char __user *data,
 817                                      size_t count, loff_t *ppos)
 818{
 819        struct device *dev = file->private_data;
 820        struct mem_ctl_info *mci = to_mci(dev);
 821        static enum hw_event_mc_err_type type;
 822        u16 errcount = mci->fake_inject_count;
 823
 824        if (!errcount)
 825                errcount = 1;
 826
 827        type = mci->fake_inject_ue ? HW_EVENT_ERR_UNCORRECTED
 828                                   : HW_EVENT_ERR_CORRECTED;
 829
 830        printk(KERN_DEBUG
 831               "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",
 832                errcount,
 833                (type == HW_EVENT_ERR_UNCORRECTED) ? "UE" : "CE",
 834                errcount > 1 ? "s" : "",
 835                mci->fake_inject_layer[0],
 836                mci->fake_inject_layer[1],
 837                mci->fake_inject_layer[2]
 838               );
 839        edac_mc_handle_error(type, mci, errcount, 0, 0, 0,
 840                             mci->fake_inject_layer[0],
 841                             mci->fake_inject_layer[1],
 842                             mci->fake_inject_layer[2],
 843                             "FAKE ERROR", "for EDAC testing only");
 844
 845        return count;
 846}
 847
 848static const struct file_operations debug_fake_inject_fops = {
 849        .open = simple_open,
 850        .write = edac_fake_inject_write,
 851        .llseek = generic_file_llseek,
 852};
 853#endif
 854
 855/* default Control file */
 856DEVICE_ATTR(reset_counters, S_IWUSR, NULL, mci_reset_counters_store);
 857
 858/* default Attribute files */
 859DEVICE_ATTR(mc_name, S_IRUGO, mci_ctl_name_show, NULL);
 860DEVICE_ATTR(size_mb, S_IRUGO, mci_size_mb_show, NULL);
 861DEVICE_ATTR(seconds_since_reset, S_IRUGO, mci_seconds_show, NULL);
 862DEVICE_ATTR(ue_noinfo_count, S_IRUGO, mci_ue_noinfo_show, NULL);
 863DEVICE_ATTR(ce_noinfo_count, S_IRUGO, mci_ce_noinfo_show, NULL);
 864DEVICE_ATTR(ue_count, S_IRUGO, mci_ue_count_show, NULL);
 865DEVICE_ATTR(ce_count, S_IRUGO, mci_ce_count_show, NULL);
 866DEVICE_ATTR(max_location, S_IRUGO, mci_max_location_show, NULL);
 867
 868/* memory scrubber attribute file */
 869DEVICE_ATTR(sdram_scrub_rate, S_IRUGO | S_IWUSR, mci_sdram_scrub_rate_show,
 870        mci_sdram_scrub_rate_store);
 871
 872static struct attribute *mci_attrs[] = {
 873        &dev_attr_reset_counters.attr,
 874        &dev_attr_mc_name.attr,
 875        &dev_attr_size_mb.attr,
 876        &dev_attr_seconds_since_reset.attr,
 877        &dev_attr_ue_noinfo_count.attr,
 878        &dev_attr_ce_noinfo_count.attr,
 879        &dev_attr_ue_count.attr,
 880        &dev_attr_ce_count.attr,
 881        &dev_attr_sdram_scrub_rate.attr,
 882        &dev_attr_max_location.attr,
 883        NULL
 884};
 885
 886static struct attribute_group mci_attr_grp = {
 887        .attrs  = mci_attrs,
 888};
 889
 890static const struct attribute_group *mci_attr_groups[] = {
 891        &mci_attr_grp,
 892        NULL
 893};
 894
 895static void mci_attr_release(struct device *dev)
 896{
 897        struct mem_ctl_info *mci = container_of(dev, struct mem_ctl_info, dev);
 898
 899        edac_dbg(1, "Releasing csrow device %s\n", dev_name(dev));
 900        kfree(mci);
 901}
 902
 903static struct device_type mci_attr_type = {
 904        .groups         = mci_attr_groups,
 905        .release        = mci_attr_release,
 906};
 907
 908#ifdef CONFIG_EDAC_DEBUG
 909static struct dentry *edac_debugfs;
 910
 911int __init edac_debugfs_init(void)
 912{
 913        edac_debugfs = debugfs_create_dir("edac", NULL);
 914        if (IS_ERR(edac_debugfs)) {
 915                edac_debugfs = NULL;
 916                return -ENOMEM;
 917        }
 918        return 0;
 919}
 920
 921void __exit edac_debugfs_exit(void)
 922{
 923        debugfs_remove(edac_debugfs);
 924}
 925
 926int edac_create_debug_nodes(struct mem_ctl_info *mci)
 927{
 928        struct dentry *d, *parent;
 929        char name[80];
 930        int i;
 931
 932        if (!edac_debugfs)
 933                return -ENODEV;
 934
 935        d = debugfs_create_dir(mci->dev.kobj.name, edac_debugfs);
 936        if (!d)
 937                return -ENOMEM;
 938        parent = d;
 939
 940        for (i = 0; i < mci->n_layers; i++) {
 941                sprintf(name, "fake_inject_%s",
 942                             edac_layer_name[mci->layers[i].type]);
 943                d = debugfs_create_u8(name, S_IRUGO | S_IWUSR, parent,
 944                                      &mci->fake_inject_layer[i]);
 945                if (!d)
 946                        goto nomem;
 947        }
 948
 949        d = debugfs_create_bool("fake_inject_ue", S_IRUGO | S_IWUSR, parent,
 950                                &mci->fake_inject_ue);
 951        if (!d)
 952                goto nomem;
 953
 954        d = debugfs_create_u16("fake_inject_count", S_IRUGO | S_IWUSR, parent,
 955                                &mci->fake_inject_count);
 956        if (!d)
 957                goto nomem;
 958
 959        d = debugfs_create_file("fake_inject", S_IWUSR, parent,
 960                                &mci->dev,
 961                                &debug_fake_inject_fops);
 962        if (!d)
 963                goto nomem;
 964
 965        mci->debugfs = parent;
 966        return 0;
 967nomem:
 968        debugfs_remove(mci->debugfs);
 969        return -ENOMEM;
 970}
 971#endif
 972
 973/*
 974 * Create a new Memory Controller kobject instance,
 975 *      mc<id> under the 'mc' directory
 976 *
 977 * Return:
 978 *      0       Success
 979 *      !0      Failure
 980 */
 981int edac_create_sysfs_mci_device(struct mem_ctl_info *mci)
 982{
 983        int i, err;
 984
 985        /*
 986         * The memory controller needs its own bus, in order to avoid
 987         * namespace conflicts at /sys/bus/edac.
 988         */
 989        mci->bus.name = kasprintf(GFP_KERNEL, "mc%d", mci->mc_idx);
 990        if (!mci->bus.name)
 991                return -ENOMEM;
 992        edac_dbg(0, "creating bus %s\n", mci->bus.name);
 993        err = bus_register(&mci->bus);
 994        if (err < 0)
 995                return err;
 996
 997        /* get the /sys/devices/system/edac subsys reference */
 998        mci->dev.type = &mci_attr_type;
 999        device_initialize(&mci->dev);
1000
1001        mci->dev.parent = mci_pdev;
1002        mci->dev.bus = &mci->bus;
1003        dev_set_name(&mci->dev, "mc%d", mci->mc_idx);
1004        dev_set_drvdata(&mci->dev, mci);
1005        pm_runtime_forbid(&mci->dev);
1006
1007        edac_dbg(0, "creating device %s\n", dev_name(&mci->dev));
1008        err = device_add(&mci->dev);
1009        if (err < 0) {
1010                bus_unregister(&mci->bus);
1011                kfree(mci->bus.name);
1012                return err;
1013        }
1014
1015        /*
1016         * Create the dimm/rank devices
1017         */
1018        for (i = 0; i < mci->tot_dimms; i++) {
1019                struct dimm_info *dimm = mci->dimms[i];
1020                /* Only expose populated DIMMs */
1021                if (dimm->nr_pages == 0)
1022                        continue;
1023#ifdef CONFIG_EDAC_DEBUG
1024                edac_dbg(1, "creating dimm%d, located at ", i);
1025                if (edac_debug_level >= 1) {
1026                        int lay;
1027                        for (lay = 0; lay < mci->n_layers; lay++)
1028                                printk(KERN_CONT "%s %d ",
1029                                        edac_layer_name[mci->layers[lay].type],
1030                                        dimm->location[lay]);
1031                        printk(KERN_CONT "\n");
1032                }
1033#endif
1034                err = edac_create_dimm_object(mci, dimm, i);
1035                if (err) {
1036                        edac_dbg(1, "failure: create dimm %d obj\n", i);
1037                        goto fail;
1038                }
1039        }
1040
1041#ifdef CONFIG_EDAC_LEGACY_SYSFS
1042        err = edac_create_csrow_objects(mci);
1043        if (err < 0)
1044                goto fail;
1045#endif
1046
1047#ifdef CONFIG_EDAC_DEBUG
1048        edac_create_debug_nodes(mci);
1049#endif
1050        return 0;
1051
1052fail:
1053        for (i--; i >= 0; i--) {
1054                struct dimm_info *dimm = mci->dimms[i];
1055                if (dimm->nr_pages == 0)
1056                        continue;
1057                device_unregister(&dimm->dev);
1058        }
1059        device_unregister(&mci->dev);
1060        bus_unregister(&mci->bus);
1061        kfree(mci->bus.name);
1062        return err;
1063}
1064
1065/*
1066 * remove a Memory Controller instance
1067 */
1068void edac_remove_sysfs_mci_device(struct mem_ctl_info *mci)
1069{
1070        int i;
1071
1072        edac_dbg(0, "\n");
1073
1074#ifdef CONFIG_EDAC_DEBUG
1075        debugfs_remove(mci->debugfs);
1076#endif
1077#ifdef CONFIG_EDAC_LEGACY_SYSFS
1078        edac_delete_csrow_objects(mci);
1079#endif
1080
1081        for (i = 0; i < mci->tot_dimms; i++) {
1082                struct dimm_info *dimm = mci->dimms[i];
1083                if (dimm->nr_pages == 0)
1084                        continue;
1085                edac_dbg(0, "removing device %s\n", dev_name(&dimm->dev));
1086                device_unregister(&dimm->dev);
1087        }
1088}
1089
1090void edac_unregister_sysfs(struct mem_ctl_info *mci)
1091{
1092        edac_dbg(1, "Unregistering device %s\n", dev_name(&mci->dev));
1093        device_unregister(&mci->dev);
1094        bus_unregister(&mci->bus);
1095        kfree(mci->bus.name);
1096}
1097
1098static void mc_attr_release(struct device *dev)
1099{
1100        /*
1101         * There's no container structure here, as this is just the mci
1102         * parent device, used to create the /sys/devices/mc sysfs node.
1103         * So, there are no attributes on it.
1104         */
1105        edac_dbg(1, "Releasing device %s\n", dev_name(dev));
1106        kfree(dev);
1107}
1108
1109static struct device_type mc_attr_type = {
1110        .release        = mc_attr_release,
1111};
1112/*
1113 * Init/exit code for the module. Basically, creates/removes /sys/class/rc
1114 */
1115int __init edac_mc_sysfs_init(void)
1116{
1117        struct bus_type *edac_subsys;
1118        int err;
1119
1120        /* get the /sys/devices/system/edac subsys reference */
1121        edac_subsys = edac_get_sysfs_subsys();
1122        if (edac_subsys == NULL) {
1123                edac_dbg(1, "no edac_subsys\n");
1124                err = -EINVAL;
1125                goto out;
1126        }
1127
1128        mci_pdev = kzalloc(sizeof(*mci_pdev), GFP_KERNEL);
1129        if (!mci_pdev) {
1130                err = -ENOMEM;
1131                goto out_put_sysfs;
1132        }
1133
1134        mci_pdev->bus = edac_subsys;
1135        mci_pdev->type = &mc_attr_type;
1136        device_initialize(mci_pdev);
1137        dev_set_name(mci_pdev, "mc");
1138
1139        err = device_add(mci_pdev);
1140        if (err < 0)
1141                goto out_dev_free;
1142
1143        edac_dbg(0, "device %s created\n", dev_name(mci_pdev));
1144
1145        return 0;
1146
1147 out_dev_free:
1148        kfree(mci_pdev);
1149 out_put_sysfs:
1150        edac_put_sysfs_subsys();
1151 out:
1152        return err;
1153}
1154
1155void __exit edac_mc_sysfs_exit(void)
1156{
1157        device_unregister(mci_pdev);
1158        edac_put_sysfs_subsys();
1159}
1160
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