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  */
  11
  12 #include <linux/ctype.h>
  13 #include <linux/bug.h>
  14
  15 #include "edac_core.h"
  16 #include "edac_module.h"
  17
  18
  19 /* MC EDAC Controls, setable by module parameter, and sysfs */
  20 static int edac_mc_log_ue = 1;
  21 static int edac_mc_log_ce = 1;
  22 static int edac_mc_panic_on_ue;
  23 static int edac_mc_poll_msec = 1000;
  24
  25 /* Getter functions for above */
  26 int edac_mc_get_log_ue(void)
  27 {
  28         return edac_mc_log_ue;
  29 }
  30
  31 int edac_mc_get_log_ce(void)
  32 {
  33         return edac_mc_log_ce;
  34 }
  35
  36 int edac_mc_get_panic_on_ue(void)
  37 {
  38         return edac_mc_panic_on_ue;
  39 }
  40
  41 /* this is temporary */
  42 int edac_mc_get_poll_msec(void)
  43 {
  44         return edac_mc_poll_msec;
  45 }
  46
  47 static int edac_set_poll_msec(const char *val, struct kernel_param *kp)
  48 {
  49         long l;
  50         int ret;
  51
  52         if (!val)
  53                 return -EINVAL;
  54
  55         ret = strict_strtol(val, 0, &l);
  56         if (ret == -EINVAL || ((int)l != l))
  57                 return -EINVAL;
  58         *((int *)kp->arg) = l;
  59
  60         /* notify edac_mc engine to reset the poll period */
  61         edac_mc_reset_delay_period(l);
  62
  63         return 0;
  64 }
  65
  66 /* Parameter declarations for above */
  67 module_param(edac_mc_panic_on_ue, int, 0644);
  68 MODULE_PARM_DESC(edac_mc_panic_on_ue, "Panic on uncorrected error: 0=off 1=on");
  69 module_param(edac_mc_log_ue, int, 0644);
  70 MODULE_PARM_DESC(edac_mc_log_ue,
  71                  "Log uncorrectable error to console: 0=off 1=on");
  72 module_param(edac_mc_log_ce, int, 0644);
  73 MODULE_PARM_DESC(edac_mc_log_ce,
  74                  "Log correctable error to console: 0=off 1=on");
  75 module_param_call(edac_mc_poll_msec, edac_set_poll_msec, param_get_int,
  76                   &edac_mc_poll_msec, 0644);
  77 MODULE_PARM_DESC(edac_mc_poll_msec, "Polling period in milliseconds");
  78
  79 /*
  80  * various constants for Memory Controllers
  81  */
  82 static const char *mem_types[] = {
  83         [MEM_EMPTY] = "Empty",
  84         [MEM_RESERVED] = "Reserved",
  85         [MEM_UNKNOWN] = "Unknown",
  86         [MEM_FPM] = "FPM",
  87         [MEM_EDO] = "EDO",
  88         [MEM_BEDO] = "BEDO",
  89         [MEM_SDR] = "Unbuffered-SDR",
  90         [MEM_RDR] = "Registered-SDR",
  91         [MEM_DDR] = "Unbuffered-DDR",
  92         [MEM_RDDR] = "Registered-DDR",
  93         [MEM_RMBS] = "RMBS",
  94         [MEM_DDR2] = "Unbuffered-DDR2",
  95         [MEM_FB_DDR2] = "FullyBuffered-DDR2",
  96         [MEM_RDDR2] = "Registered-DDR2",
  97         [MEM_XDR] = "XDR"
  98 };
  99
 100 static const char *dev_types[] = {
 101         [DEV_UNKNOWN] = "Unknown",
 102         [DEV_X1] = "x1",
 103         [DEV_X2] = "x2",
 104         [DEV_X4] = "x4",
 105         [DEV_X8] = "x8",
 106         [DEV_X16] = "x16",
 107         [DEV_X32] = "x32",
 108         [DEV_X64] = "x64"
 109 };
 110
 111 static const char *edac_caps[] = {
 112         [EDAC_UNKNOWN] = "Unknown",
 113         [EDAC_NONE] = "None",
 114         [EDAC_RESERVED] = "Reserved",
 115         [EDAC_PARITY] = "PARITY",
 116         [EDAC_EC] = "EC",
 117         [EDAC_SECDED] = "SECDED",
 118         [EDAC_S2ECD2ED] = "S2ECD2ED",
 119         [EDAC_S4ECD4ED] = "S4ECD4ED",
 120         [EDAC_S8ECD8ED] = "S8ECD8ED",
 121         [EDAC_S16ECD16ED] = "S16ECD16ED"
 122 };
 123
 124
 125
 126 static ssize_t memctrl_int_store(void *ptr, const char *buffer, size_t count)
 127 {
 128         int *value = (int *)ptr;
 129
 130         if (isdigit(*buffer))
 131                 *value = simple_strtoul(buffer, NULL, 0);
 132
 133         return count;
 134 }
 135
 136
 137 /* EDAC sysfs CSROW data structures and methods
 138  */
 139
 140 /* Set of more default csrow<id> attribute show/store functions */
 141 static ssize_t csrow_ue_count_show(struct csrow_info *csrow, char *data,
 142                                 int private)
 143 {
 144         return sprintf(data, "%u\n", csrow->ue_count);
 145 }
 146
 147 static ssize_t csrow_ce_count_show(struct csrow_info *csrow, char *data,
 148                                 int private)
 149 {
 150         return sprintf(data, "%u\n", csrow->ce_count);
 151 }
 152
 153 static ssize_t csrow_size_show(struct csrow_info *csrow, char *data,
 154                                 int private)
 155 {
 156         return sprintf(data, "%u\n", PAGES_TO_MiB(csrow->nr_pages));
 157 }
 158
 159 static ssize_t csrow_mem_type_show(struct csrow_info *csrow, char *data,
 160                                 int private)
 161 {
 162         return sprintf(data, "%s\n", mem_types[csrow->mtype]);
 163 }
 164
 165 static ssize_t csrow_dev_type_show(struct csrow_info *csrow, char *data,
 166                                 int private)
 167 {
 168         return sprintf(data, "%s\n", dev_types[csrow->dtype]);
 169 }
 170
 171 static ssize_t csrow_edac_mode_show(struct csrow_info *csrow, char *data,
 172                                 int private)
 173 {
 174         return sprintf(data, "%s\n", edac_caps[csrow->edac_mode]);
 175 }
 176
 177 /* show/store functions for DIMM Label attributes */
 178 static ssize_t channel_dimm_label_show(struct csrow_info *csrow,
 179                                 char *data, int channel)
 180 {
 181         /* if field has not been initialized, there is nothing to send */
 182         if (!csrow->channels[channel].label[0])
 183                 return 0;
 184
 185         return snprintf(data, EDAC_MC_LABEL_LEN, "%s\n",
 186                         csrow->channels[channel].label);
 187 }
 188
 189 static ssize_t channel_dimm_label_store(struct csrow_info *csrow,
 190                                         const char *data,
 191                                         size_t count, int channel)
 192 {
 193         ssize_t max_size = 0;
 194
 195         max_size = min((ssize_t) count, (ssize_t) EDAC_MC_LABEL_LEN - 1);
 196         strncpy(csrow->channels[channel].label, data, max_size);
 197         csrow->channels[channel].label[max_size] = '\0';
 198
 199         return max_size;
 200 }
 201
 202 /* show function for dynamic chX_ce_count attribute */
 203 static ssize_t channel_ce_count_show(struct csrow_info *csrow,
 204                                 char *data, int channel)
 205 {
 206         return sprintf(data, "%u\n", csrow->channels[channel].ce_count);
 207 }
 208
 209 /* csrow specific attribute structure */
 210 struct csrowdev_attribute {
 211         struct attribute attr;
 212          ssize_t(*show) (struct csrow_info *, char *, int);
 213          ssize_t(*store) (struct csrow_info *, const char *, size_t, int);
 214         int private;
 215 };
 216
 217 #define to_csrow(k) container_of(k, struct csrow_info, kobj)
 218 #define to_csrowdev_attr(a) container_of(a, struct csrowdev_attribute, attr)
 219
 220 /* Set of show/store higher level functions for default csrow attributes */
 221 static ssize_t csrowdev_show(struct kobject *kobj,
 222                         struct attribute *attr, char *buffer)
 223 {
 224         struct csrow_info *csrow = to_csrow(kobj);
 225         struct csrowdev_attribute *csrowdev_attr = to_csrowdev_attr(attr);
 226
 227         if (csrowdev_attr->show)
 228                 return csrowdev_attr->show(csrow,
 229                                         buffer, csrowdev_attr->private);
 230         return -EIO;
 231 }
 232
 233 static ssize_t csrowdev_store(struct kobject *kobj, struct attribute *attr,
 234                         const char *buffer, size_t count)
 235 {
 236         struct csrow_info *csrow = to_csrow(kobj);
 237         struct csrowdev_attribute *csrowdev_attr = to_csrowdev_attr(attr);
 238
 239         if (csrowdev_attr->store)
 240                 return csrowdev_attr->store(csrow,
 241                                         buffer,
 242                                         count, csrowdev_attr->private);
 243         return -EIO;
 244 }
 245
 246 static struct sysfs_ops csrowfs_ops = {
 247         .show = csrowdev_show,
 248         .store = csrowdev_store
 249 };
 250
 251 #define CSROWDEV_ATTR(_name,_mode,_show,_store,_private)        \
 252 static struct csrowdev_attribute attr_##_name = {                       \
 253         .attr = {.name = __stringify(_name), .mode = _mode },   \
 254         .show   = _show,                                        \
 255         .store  = _store,                                       \
 256         .private = _private,                                    \
 257 };
 258
 259 /* default cwrow<id>/attribute files */
 260 CSROWDEV_ATTR(size_mb, S_IRUGO, csrow_size_show, NULL, 0);
 261 CSROWDEV_ATTR(dev_type, S_IRUGO, csrow_dev_type_show, NULL, 0);
 262 CSROWDEV_ATTR(mem_type, S_IRUGO, csrow_mem_type_show, NULL, 0);
 263 CSROWDEV_ATTR(edac_mode, S_IRUGO, csrow_edac_mode_show, NULL, 0);
 264 CSROWDEV_ATTR(ue_count, S_IRUGO, csrow_ue_count_show, NULL, 0);
 265 CSROWDEV_ATTR(ce_count, S_IRUGO, csrow_ce_count_show, NULL, 0);
 266
 267 /* default attributes of the CSROW<id> object */
 268 static struct csrowdev_attribute *default_csrow_attr[] = {
 269         &attr_dev_type,
 270         &attr_mem_type,
 271         &attr_edac_mode,
 272         &attr_size_mb,
 273         &attr_ue_count,
 274         &attr_ce_count,
 275         NULL,
 276 };
 277
 278 /* possible dynamic channel DIMM Label attribute files */
 279 CSROWDEV_ATTR(ch0_dimm_label, S_IRUGO | S_IWUSR,
 280         channel_dimm_label_show, channel_dimm_label_store, 0);
 281 CSROWDEV_ATTR(ch1_dimm_label, S_IRUGO | S_IWUSR,
 282         channel_dimm_label_show, channel_dimm_label_store, 1);
 283 CSROWDEV_ATTR(ch2_dimm_label, S_IRUGO | S_IWUSR,
 284         channel_dimm_label_show, channel_dimm_label_store, 2);
 285 CSROWDEV_ATTR(ch3_dimm_label, S_IRUGO | S_IWUSR,
 286         channel_dimm_label_show, channel_dimm_label_store, 3);
 287 CSROWDEV_ATTR(ch4_dimm_label, S_IRUGO | S_IWUSR,
 288         channel_dimm_label_show, channel_dimm_label_store, 4);
 289 CSROWDEV_ATTR(ch5_dimm_label, S_IRUGO | S_IWUSR,
 290         channel_dimm_label_show, channel_dimm_label_store, 5);
 291
 292 /* Total possible dynamic DIMM Label attribute file table */
 293 static struct csrowdev_attribute *dynamic_csrow_dimm_attr[] = {
 294         &attr_ch0_dimm_label,
 295         &attr_ch1_dimm_label,
 296         &attr_ch2_dimm_label,
 297         &attr_ch3_dimm_label,
 298         &attr_ch4_dimm_label,
 299         &attr_ch5_dimm_label
 300 };
 301
 302 /* possible dynamic channel ce_count attribute files */
 303 CSROWDEV_ATTR(ch0_ce_count, S_IRUGO | S_IWUSR, channel_ce_count_show, NULL, 0);
 304 CSROWDEV_ATTR(ch1_ce_count, S_IRUGO | S_IWUSR, channel_ce_count_show, NULL, 1);
 305 CSROWDEV_ATTR(ch2_ce_count, S_IRUGO | S_IWUSR, channel_ce_count_show, NULL, 2);
 306 CSROWDEV_ATTR(ch3_ce_count, S_IRUGO | S_IWUSR, channel_ce_count_show, NULL, 3);
 307 CSROWDEV_ATTR(ch4_ce_count, S_IRUGO | S_IWUSR, channel_ce_count_show, NULL, 4);
 308 CSROWDEV_ATTR(ch5_ce_count, S_IRUGO | S_IWUSR, channel_ce_count_show, NULL, 5);
 309
 310 /* Total possible dynamic ce_count attribute file table */
 311 static struct csrowdev_attribute *dynamic_csrow_ce_count_attr[] = {
 312         &attr_ch0_ce_count,
 313         &attr_ch1_ce_count,
 314         &attr_ch2_ce_count,
 315         &attr_ch3_ce_count,
 316         &attr_ch4_ce_count,
 317         &attr_ch5_ce_count
 318 };
 319
 320 #define EDAC_NR_CHANNELS        6
 321
 322 /* Create dynamic CHANNEL files, indexed by 'chan',  under specifed CSROW */
 323 static int edac_create_channel_files(struct kobject *kobj, int chan)
 324 {
 325         int err = -ENODEV;
 326
 327         if (chan >= EDAC_NR_CHANNELS)
 328                 return err;
 329
 330         /* create the DIMM label attribute file */
 331         err = sysfs_create_file(kobj,
 332                                 (struct attribute *)
 333                                 dynamic_csrow_dimm_attr[chan]);
 334
 335         if (!err) {
 336                 /* create the CE Count attribute file */
 337                 err = sysfs_create_file(kobj,
 338                                         (struct attribute *)
 339                                         dynamic_csrow_ce_count_attr[chan]);
 340         } else {
 341                 debugf1("%s()  dimm labels and ce_count files created",
 342                         __func__);
 343         }
 344
 345         return err;
 346 }
 347
 348 /* No memory to release for this kobj */
 349 static void edac_csrow_instance_release(struct kobject *kobj)
 350 {
 351         struct mem_ctl_info *mci;
 352         struct csrow_info *cs;
 353
 354         debugf1("%s()\n", __func__);
 355
 356         cs = container_of(kobj, struct csrow_info, kobj);
 357         mci = cs->mci;
 358
 359         kobject_put(&mci->edac_mci_kobj);
 360 }
 361
 362 /* the kobj_type instance for a CSROW */
 363 static struct kobj_type ktype_csrow = {
 364         .release = edac_csrow_instance_release,
 365         .sysfs_ops = &csrowfs_ops,
 366         .default_attrs = (struct attribute **)default_csrow_attr,
 367 };
 368
 369 /* Create a CSROW object under specifed edac_mc_device */
 370 static int edac_create_csrow_object(struct mem_ctl_info *mci,
 371                                         struct csrow_info *csrow, int index)
 372 {
 373         struct kobject *kobj_mci = &mci->edac_mci_kobj;
 374         struct kobject *kobj;
 375         int chan;
 376         int err;
 377
 378         /* generate ..../edac/mc/mc<id>/csrow<index>   */
 379         memset(&csrow->kobj, 0, sizeof(csrow->kobj));
 380         csrow->mci = mci;       /* include container up link */
 381
 382         /* bump the mci instance's kobject's ref count */
 383         kobj = kobject_get(&mci->edac_mci_kobj);
 384         if (!kobj) {
 385                 err = -ENODEV;
 386                 goto err_out;
 387         }
 388
 389         /* Instanstiate the csrow object */
 390         err = kobject_init_and_add(&csrow->kobj, &ktype_csrow, kobj_mci,
 391                                    "csrow%d", index);
 392         if (err)
 393                 goto err_release_top_kobj;
 394
 395         /* At this point, to release a csrow kobj, one must
 396          * call the kobject_put and allow that tear down
 397          * to work the releasing
 398          */
 399
 400         /* Create the dyanmic attribute files on this csrow,
 401          * namely, the DIMM labels and the channel ce_count
 402          */
 403         for (chan = 0; chan < csrow->nr_channels; chan++) {
 404                 err = edac_create_channel_files(&csrow->kobj, chan);
 405                 if (err) {
 406                         /* special case the unregister here */
 407                         kobject_put(&csrow->kobj);
 408                         goto err_out;
 409                 }
 410         }
 411         kobject_uevent(&csrow->kobj, KOBJ_ADD);
 412         return 0;
 413
 414         /* error unwind stack */
 415 err_release_top_kobj:
 416         kobject_put(&mci->edac_mci_kobj);
 417
 418 err_out:
 419         return err;
 420 }
 421
 422 /* default sysfs methods and data structures for the main MCI kobject */
 423
 424 static ssize_t mci_reset_counters_store(struct mem_ctl_info *mci,
 425                                         const char *data, size_t count)
 426 {
 427         int row, chan;
 428
 429         mci->ue_noinfo_count = 0;
 430         mci->ce_noinfo_count = 0;
 431         mci->ue_count = 0;
 432         mci->ce_count = 0;
 433
 434         for (row = 0; row < mci->nr_csrows; row++) {
 435                 struct csrow_info *ri = &mci->csrows[row];
 436
 437                 ri->ue_count = 0;
 438                 ri->ce_count = 0;
 439
 440                 for (chan = 0; chan < ri->nr_channels; chan++)
 441                         ri->channels[chan].ce_count = 0;
 442         }
 443
 444         mci->start_time = jiffies;
 445         return count;
 446 }
 447
 448 /* memory scrubbing */
 449 static ssize_t mci_sdram_scrub_rate_store(struct mem_ctl_info *mci,
 450                                         const char *data, size_t count)
 451 {
 452         u32 bandwidth = -1;
 453
 454         if (mci->set_sdram_scrub_rate) {
 455
 456                 memctrl_int_store(&bandwidth, data, count);
 457
 458                 if (!(*mci->set_sdram_scrub_rate) (mci, &bandwidth)) {
 459                         edac_printk(KERN_DEBUG, EDAC_MC,
 460                                 "Scrub rate set successfully, applied: %d\n",
 461                                 bandwidth);
 462                 } else {
 463                         /* FIXME: error codes maybe? */
 464                         edac_printk(KERN_DEBUG, EDAC_MC,
 465                                 "Scrub rate set FAILED, could not apply: %d\n",
 466                                 bandwidth);
 467                 }
 468         } else {
 469                 /* FIXME: produce "not implemented" ERROR for user-side. */
 470                 edac_printk(KERN_WARNING, EDAC_MC,
 471                         "Memory scrubbing 'set'control is not implemented!\n");
 472         }
 473         return count;
 474 }
 475
 476 static ssize_t mci_sdram_scrub_rate_show(struct mem_ctl_info *mci, char *data)
 477 {
 478         u32 bandwidth = -1;
 479
 480         if (mci->get_sdram_scrub_rate) {
 481                 if (!(*mci->get_sdram_scrub_rate) (mci, &bandwidth)) {
 482                         edac_printk(KERN_DEBUG, EDAC_MC,
 483                                 "Scrub rate successfully, fetched: %d\n",
 484                                 bandwidth);
 485                 } else {
 486                         /* FIXME: error codes maybe? */
 487                         edac_printk(KERN_DEBUG, EDAC_MC,
 488                                 "Scrub rate fetch FAILED, got: %d\n",
 489                                 bandwidth);
 490                 }
 491         } else {
 492                 /* FIXME: produce "not implemented" ERROR for user-side.  */
 493                 edac_printk(KERN_WARNING, EDAC_MC,
 494                         "Memory scrubbing 'get' control is not implemented\n");
 495         }
 496         return sprintf(data, "%d\n", bandwidth);
 497 }
 498
 499 /* default attribute files for the MCI object */
 500 static ssize_t mci_ue_count_show(struct mem_ctl_info *mci, char *data)
 501 {
 502         return sprintf(data, "%d\n", mci->ue_count);
 503 }
 504
 505 static ssize_t mci_ce_count_show(struct mem_ctl_info *mci, char *data)
 506 {
 507         return sprintf(data, "%d\n", mci->ce_count);
 508 }
 509
 510 static ssize_t mci_ce_noinfo_show(struct mem_ctl_info *mci, char *data)
 511 {
 512         return sprintf(data, "%d\n", mci->ce_noinfo_count);
 513 }
 514
 515 static ssize_t mci_ue_noinfo_show(struct mem_ctl_info *mci, char *data)
 516 {
 517         return sprintf(data, "%d\n", mci->ue_noinfo_count);
 518 }
 519
 520 static ssize_t mci_seconds_show(struct mem_ctl_info *mci, char *data)
 521 {
 522         return sprintf(data, "%ld\n", (jiffies - mci->start_time) / HZ);
 523 }
 524
 525 static ssize_t mci_ctl_name_show(struct mem_ctl_info *mci, char *data)
 526 {
 527         return sprintf(data, "%s\n", mci->ctl_name);
 528 }
 529
 530 static ssize_t mci_size_mb_show(struct mem_ctl_info *mci, char *data)
 531 {
 532         int total_pages, csrow_idx;
 533
 534         for (total_pages = csrow_idx = 0; csrow_idx < mci->nr_csrows;
 535                 csrow_idx++) {
 536                 struct csrow_info *csrow = &mci->csrows[csrow_idx];
 537
 538                 if (!csrow->nr_pages)
 539                         continue;
 540
 541                 total_pages += csrow->nr_pages;
 542         }
 543
 544         return sprintf(data, "%u\n", PAGES_TO_MiB(total_pages));
 545 }
 546
 547 #define to_mci(k) container_of(k, struct mem_ctl_info, edac_mci_kobj)
 548 #define to_mcidev_attr(a) container_of(a,struct mcidev_sysfs_attribute,attr)
 549
 550 /* MCI show/store functions for top most object */
 551 static ssize_t mcidev_show(struct kobject *kobj, struct attribute *attr,
 552                         char *buffer)
 553 {
 554         struct mem_ctl_info *mem_ctl_info = to_mci(kobj);
 555         struct mcidev_sysfs_attribute *mcidev_attr = to_mcidev_attr(attr);
 556
 557         if (mcidev_attr->show)
 558                 return mcidev_attr->show(mem_ctl_info, buffer);
 559
 560         return -EIO;
 561 }
 562
 563 static ssize_t mcidev_store(struct kobject *kobj, struct attribute *attr,
 564                         const char *buffer, size_t count)
 565 {
 566         struct mem_ctl_info *mem_ctl_info = to_mci(kobj);
 567         struct mcidev_sysfs_attribute *mcidev_attr = to_mcidev_attr(attr);
 568
 569         if (mcidev_attr->store)
 570                 return mcidev_attr->store(mem_ctl_info, buffer, count);
 571
 572         return -EIO;
 573 }
 574
 575 /* Intermediate show/store table */
 576 static struct sysfs_ops mci_ops = {
 577         .show = mcidev_show,
 578         .store = mcidev_store
 579 };
 580
 581 #define MCIDEV_ATTR(_name,_mode,_show,_store)                   \
 582 static struct mcidev_sysfs_attribute mci_attr_##_name = {                       \
 583         .attr = {.name = __stringify(_name), .mode = _mode },   \
 584         .show   = _show,                                        \
 585         .store  = _store,                                       \
 586 };
 587
 588 /* default Control file */
 589 MCIDEV_ATTR(reset_counters, S_IWUSR, NULL, mci_reset_counters_store);
 590
 591 /* default Attribute files */
 592 MCIDEV_ATTR(mc_name, S_IRUGO, mci_ctl_name_show, NULL);
 593 MCIDEV_ATTR(size_mb, S_IRUGO, mci_size_mb_show, NULL);
 594 MCIDEV_ATTR(seconds_since_reset, S_IRUGO, mci_seconds_show, NULL);
 595 MCIDEV_ATTR(ue_noinfo_count, S_IRUGO, mci_ue_noinfo_show, NULL);
 596 MCIDEV_ATTR(ce_noinfo_count, S_IRUGO, mci_ce_noinfo_show, NULL);
 597 MCIDEV_ATTR(ue_count, S_IRUGO, mci_ue_count_show, NULL);
 598 MCIDEV_ATTR(ce_count, S_IRUGO, mci_ce_count_show, NULL);
 599
 600 /* memory scrubber attribute file */
 601 MCIDEV_ATTR(sdram_scrub_rate, S_IRUGO | S_IWUSR, mci_sdram_scrub_rate_show,
 602         mci_sdram_scrub_rate_store);
 603
 604 static struct mcidev_sysfs_attribute *mci_attr[] = {
 605         &mci_attr_reset_counters,
 606         &mci_attr_mc_name,
 607         &mci_attr_size_mb,
 608         &mci_attr_seconds_since_reset,
 609         &mci_attr_ue_noinfo_count,
 610         &mci_attr_ce_noinfo_count,
 611         &mci_attr_ue_count,
 612         &mci_attr_ce_count,
 613         &mci_attr_sdram_scrub_rate,
 614         NULL
 615 };
 616
 617
 618 /*
 619  * Release of a MC controlling instance
 620  *
 621  *      each MC control instance has the following resources upon entry:
 622  *              a) a ref count on the top memctl kobj
 623  *              b) a ref count on this module
 624  *
 625  *      this function must decrement those ref counts and then
 626  *      issue a free on the instance's memory
 627  */
 628 static void edac_mci_control_release(struct kobject *kobj)
 629 {
 630         struct mem_ctl_info *mci;
 631
 632         mci = to_mci(kobj);
 633
 634         debugf0("%s() mci instance idx=%d releasing\n", __func__, mci->mc_idx);
 635
 636         /* decrement the module ref count */
 637         module_put(mci->owner);
 638
 639         /* free the mci instance memory here */
 640         kfree(mci);
 641 }
 642
 643 static struct kobj_type ktype_mci = {
 644         .release = edac_mci_control_release,
 645         .sysfs_ops = &mci_ops,
 646         .default_attrs = (struct attribute **)mci_attr,
 647 };
 648
 649 /* EDAC memory controller sysfs kset:
 650  *      /sys/devices/system/edac/mc
 651  */
 652 static struct kset *mc_kset;
 653
 654 /*
 655  * edac_mc_register_sysfs_main_kobj
 656  *
 657  *      setups and registers the main kobject for each mci
 658  */
 659 int edac_mc_register_sysfs_main_kobj(struct mem_ctl_info *mci)
 660 {
 661         struct kobject *kobj_mci;
 662         int err;
 663
 664         debugf1("%s()\n", __func__);
 665
 666         kobj_mci = &mci->edac_mci_kobj;
 667
 668         /* Init the mci's kobject */
 669         memset(kobj_mci, 0, sizeof(*kobj_mci));
 670
 671         /* Record which module 'owns' this control structure
 672          * and bump the ref count of the module
 673          */
 674         mci->owner = THIS_MODULE;
 675
 676         /* bump ref count on this module */
 677         if (!try_module_get(mci->owner)) {
 678                 err = -ENODEV;
 679                 goto fail_out;
 680         }
 681
 682         /* this instance become part of the mc_kset */
 683         kobj_mci->kset = mc_kset;
 684
 685         /* register the mc<id> kobject to the mc_kset */
 686         err = kobject_init_and_add(kobj_mci, &ktype_mci, NULL,
 687                                    "mc%d", mci->mc_idx);
 688         if (err) {
 689                 debugf1("%s()Failed to register '.../edac/mc%d'\n",
 690                         __func__, mci->mc_idx);
 691                 goto kobj_reg_fail;
 692         }
 693         kobject_uevent(kobj_mci, KOBJ_ADD);
 694
 695         /* At this point, to 'free' the control struct,
 696          * edac_mc_unregister_sysfs_main_kobj() must be used
 697          */
 698
 699         debugf1("%s() Registered '.../edac/mc%d' kobject\n",
 700                 __func__, mci->mc_idx);
 701
 702         return 0;
 703
 704         /* Error exit stack */
 705
 706 kobj_reg_fail:
 707         module_put(mci->owner);
 708
 709 fail_out:
 710         return err;
 711 }
 712
 713 /*
 714  * edac_mc_register_sysfs_main_kobj
 715  *
 716  *      tears down and the main mci kobject from the mc_kset
 717  */
 718 void edac_mc_unregister_sysfs_main_kobj(struct mem_ctl_info *mci)
 719 {
 720         /* delete the kobj from the mc_kset */
 721         kobject_put(&mci->edac_mci_kobj);
 722 }
 723
 724 #define EDAC_DEVICE_SYMLINK     "device"
 725
 726 /*
 727  * edac_create_mci_instance_attributes
 728  *      create MC driver specific attributes at the topmost level
 729  *      directory of this mci instance.
 730  */
 731 static int edac_create_mci_instance_attributes(struct mem_ctl_info *mci)
 732 {
 733         int err;
 734         struct mcidev_sysfs_attribute *sysfs_attrib;
 735
 736         /* point to the start of the array and iterate over it
 737          * adding each attribute listed to this mci instance's kobject
 738          */
 739         sysfs_attrib = mci->mc_driver_sysfs_attributes;
 740
 741         while (sysfs_attrib && sysfs_attrib->attr.name) {
 742                 err = sysfs_create_file(&mci->edac_mci_kobj,
 743                                         (struct attribute*) sysfs_attrib);
 744                 if (err) {
 745                         return err;
 746                 }
 747
 748                 sysfs_attrib++;
 749         }
 750
 751         return 0;
 752 }
 753
 754 /*
 755  * edac_remove_mci_instance_attributes
 756  *      remove MC driver specific attributes at the topmost level
 757  *      directory of this mci instance.
 758  */
 759 static void edac_remove_mci_instance_attributes(struct mem_ctl_info *mci)
 760 {
 761         struct mcidev_sysfs_attribute *sysfs_attrib;
 762
 763         /* point to the start of the array and iterate over it
 764          * adding each attribute listed to this mci instance's kobject
 765          */
 766         sysfs_attrib = mci->mc_driver_sysfs_attributes;
 767
 768         /* loop if there are attributes and until we hit a NULL entry */
 769         while (sysfs_attrib && sysfs_attrib->attr.name) {
 770                 sysfs_remove_file(&mci->edac_mci_kobj,
 771                                         (struct attribute *) sysfs_attrib);
 772                 sysfs_attrib++;
 773         }
 774 }
 775
 776
 777 /*
 778  * Create a new Memory Controller kobject instance,
 779  *      mc<id> under the 'mc' directory
 780  *
 781  * Return:
 782  *      0       Success
 783  *      !0      Failure
 784  */
 785 int edac_create_sysfs_mci_device(struct mem_ctl_info *mci)
 786 {
 787         int i;
 788         int err;
 789         struct csrow_info *csrow;
 790         struct kobject *kobj_mci = &mci->edac_mci_kobj;
 791
 792         debugf0("%s() idx=%d\n", __func__, mci->mc_idx);
 793
 794         /* create a symlink for the device */
 795         err = sysfs_create_link(kobj_mci, &mci->dev->kobj,
 796                                 EDAC_DEVICE_SYMLINK);
 797         if (err) {
 798                 debugf1("%s() failure to create symlink\n", __func__);
 799                 goto fail0;
 800         }
 801
 802         /* If the low level driver desires some attributes,
 803          * then create them now for the driver.
 804          */
 805         if (mci->mc_driver_sysfs_attributes) {
 806                 err = edac_create_mci_instance_attributes(mci);
 807                 if (err) {
 808                         debugf1("%s() failure to create mci attributes\n",
 809                                 __func__);
 810                         goto fail0;
 811                 }
 812         }
 813
 814         /* Make directories for each CSROW object under the mc<id> kobject
 815          */
 816         for (i = 0; i < mci->nr_csrows; i++) {
 817                 csrow = &mci->csrows[i];
 818
 819                 /* Only expose populated CSROWs */
 820                 if (csrow->nr_pages > 0) {
 821                         err = edac_create_csrow_object(mci, csrow, i);
 822                         if (err) {
 823                                 debugf1("%s() failure: create csrow %d obj\n",
 824                                         __func__, i);
 825                                 goto fail1;
 826                         }
 827                 }
 828         }
 829
 830         return 0;
 831
 832         /* CSROW error: backout what has already been registered,  */
 833 fail1:
 834         for (i--; i >= 0; i--) {
 835                 if (csrow->nr_pages > 0) {
 836                         kobject_put(&mci->csrows[i].kobj);
 837                 }
 838         }
 839
 840         /* remove the mci instance's attributes, if any */
 841         edac_remove_mci_instance_attributes(mci);
 842
 843         /* remove the symlink */
 844         sysfs_remove_link(kobj_mci, EDAC_DEVICE_SYMLINK);
 845
 846 fail0:
 847         return err;
 848 }
 849
 850 /*
 851  * remove a Memory Controller instance
 852  */
 853 void edac_remove_sysfs_mci_device(struct mem_ctl_info *mci)
 854 {
 855         int i;
 856
 857         debugf0("%s()\n", __func__);
 858
 859         /* remove all csrow kobjects */
 860         for (i = 0; i < mci->nr_csrows; i++) {
 861                 if (mci->csrows[i].nr_pages > 0) {
 862                         debugf0("%s()  unreg csrow-%d\n", __func__, i);
 863                         kobject_put(&mci->csrows[i].kobj);
 864                 }
 865         }
 866
 867         debugf0("%s()  remove_link\n", __func__);
 868
 869         /* remove the symlink */
 870         sysfs_remove_link(&mci->edac_mci_kobj, EDAC_DEVICE_SYMLINK);
 871
 872         debugf0("%s()  remove_mci_instance\n", __func__);
 873
 874         /* remove this mci instance's attribtes */
 875         edac_remove_mci_instance_attributes(mci);
 876
 877         debugf0("%s()  unregister this mci kobj\n", __func__);
 878
 879         /* unregister this instance's kobject */
 880         kobject_put(&mci->edac_mci_kobj);
 881 }
 882
 883
 884
 885
 886 /*
 887  * edac_setup_sysfs_mc_kset(void)
 888  *
 889  * Initialize the mc_kset for the 'mc' entry
 890  *      This requires creating the top 'mc' directory with a kset
 891  *      and its controls/attributes.
 892  *
 893  *      To this 'mc' kset, instance 'mci' will be grouped as children.
 894  *
 895  * Return:  0 SUCCESS
 896  *         !0 FAILURE error code
 897  */
 898 int edac_sysfs_setup_mc_kset(void)
 899 {
 900         int err = 0;
 901         struct sysdev_class *edac_class;
 902
 903         debugf1("%s()\n", __func__);
 904
 905         /* get the /sys/devices/system/edac class reference */
 906         edac_class = edac_get_edac_class();
 907         if (edac_class == NULL) {
 908                 debugf1("%s() no edac_class error=%d\n", __func__, err);
 909                 goto fail_out;
 910         }
 911
 912         /* Init the MC's kobject */
 913         mc_kset = kset_create_and_add("mc", NULL, &edac_class->kset.kobj);
 914         if (!mc_kset) {
 915                 err = -ENOMEM;
 916                 debugf1("%s() Failed to register '.../edac/mc'\n", __func__);
 917                 goto fail_out;
 918         }
 919
 920         debugf1("%s() Registered '.../edac/mc' kobject\n", __func__);
 921
 922         return 0;
 923
 924
 925         /* error unwind stack */
 926 fail_out:
 927         return err;
 928 }
 929
 930 /*
 931  * edac_sysfs_teardown_mc_kset
 932  *
 933  *      deconstruct the mc_ket for memory controllers
 934  */
 935 void edac_sysfs_teardown_mc_kset(void)
 936 {
 937         kset_unregister(mc_kset);
 938 }
 939