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/slab.h>
  14 #include <linux/bug.h>
  15
  16 #include "edac_core.h"
  17 #include "edac_module.h"
  18
  19
  20 /* MC EDAC Controls, setable by module parameter, and sysfs */
  21 static int edac_mc_log_ue = 1;
  22 static int edac_mc_log_ce = 1;
  23 static int edac_mc_panic_on_ue;
  24 static int edac_mc_poll_msec = 1000;
  25
  26 /* Getter functions for above */
  27 int edac_mc_get_log_ue(void)
  28 {
  29         return edac_mc_log_ue;
  30 }
  31
  32 int edac_mc_get_log_ce(void)
  33 {
  34         return edac_mc_log_ce;
  35 }
  36
  37 int edac_mc_get_panic_on_ue(void)
  38 {
  39         return edac_mc_panic_on_ue;
  40 }
  41
  42 /* this is temporary */
  43 int edac_mc_get_poll_msec(void)
  44 {
  45         return edac_mc_poll_msec;
  46 }
  47
  48 static int edac_set_poll_msec(const char *val, struct kernel_param *kp)
  49 {
  50         long l;
  51         int ret;
  52
  53         if (!val)
  54                 return -EINVAL;
  55
  56         ret = strict_strtol(val, 0, &l);
  57         if (ret == -EINVAL || ((int)l != l))
  58                 return -EINVAL;
  59         *((int *)kp->arg) = l;
  60
  61         /* notify edac_mc engine to reset the poll period */
  62         edac_mc_reset_delay_period(l);
  63
  64         return 0;
  65 }
  66
  67 /* Parameter declarations for above */
  68 module_param(edac_mc_panic_on_ue, int, 0644);
  69 MODULE_PARM_DESC(edac_mc_panic_on_ue, "Panic on uncorrected error: 0=off 1=on");
  70 module_param(edac_mc_log_ue, int, 0644);
  71 MODULE_PARM_DESC(edac_mc_log_ue,
  72                  "Log uncorrectable error to console: 0=off 1=on");
  73 module_param(edac_mc_log_ce, int, 0644);
  74 MODULE_PARM_DESC(edac_mc_log_ce,
  75                  "Log correctable error to console: 0=off 1=on");
  76 module_param_call(edac_mc_poll_msec, edac_set_poll_msec, param_get_int,
  77                   &edac_mc_poll_msec, 0644);
  78 MODULE_PARM_DESC(edac_mc_poll_msec, "Polling period in milliseconds");
  79
  80 /*
  81  * various constants for Memory Controllers
  82  */
  83 static const char *mem_types[] = {
  84         [MEM_EMPTY] = "Empty",
  85         [MEM_RESERVED] = "Reserved",
  86         [MEM_UNKNOWN] = "Unknown",
  87         [MEM_FPM] = "FPM",
  88         [MEM_EDO] = "EDO",
  89         [MEM_BEDO] = "BEDO",
  90         [MEM_SDR] = "Unbuffered-SDR",
  91         [MEM_RDR] = "Registered-SDR",
  92         [MEM_DDR] = "Unbuffered-DDR",
  93         [MEM_RDDR] = "Registered-DDR",
  94         [MEM_RMBS] = "RMBS",
  95         [MEM_DDR2] = "Unbuffered-DDR2",
  96         [MEM_FB_DDR2] = "FullyBuffered-DDR2",
  97         [MEM_RDDR2] = "Registered-DDR2",
  98         [MEM_XDR] = "XDR",
  99         [MEM_DDR3] = "Unbuffered-DDR3",
 100         [MEM_RDDR3] = "Registered-DDR3"
 101 };
 102
 103 static const char *dev_types[] = {
 104         [DEV_UNKNOWN] = "Unknown",
 105         [DEV_X1] = "x1",
 106         [DEV_X2] = "x2",
 107         [DEV_X4] = "x4",
 108         [DEV_X8] = "x8",
 109         [DEV_X16] = "x16",
 110         [DEV_X32] = "x32",
 111         [DEV_X64] = "x64"
 112 };
 113
 114 static const char *edac_caps[] = {
 115         [EDAC_UNKNOWN] = "Unknown",
 116         [EDAC_NONE] = "None",
 117         [EDAC_RESERVED] = "Reserved",
 118         [EDAC_PARITY] = "PARITY",
 119         [EDAC_EC] = "EC",
 120         [EDAC_SECDED] = "SECDED",
 121         [EDAC_S2ECD2ED] = "S2ECD2ED",
 122         [EDAC_S4ECD4ED] = "S4ECD4ED",
 123         [EDAC_S8ECD8ED] = "S8ECD8ED",
 124         [EDAC_S16ECD16ED] = "S16ECD16ED"
 125 };
 126
 127
 128
 129 static ssize_t memctrl_int_store(void *ptr, const char *buffer, size_t count)
 130 {
 131         int *value = (int *)ptr;
 132
 133         if (isdigit(*buffer))
 134                 *value = simple_strtoul(buffer, NULL, 0);
 135
 136         return count;
 137 }
 138
 139
 140 /* EDAC sysfs CSROW data structures and methods
 141  */
 142
 143 /* Set of more default csrow<id> attribute show/store functions */
 144 static ssize_t csrow_ue_count_show(struct csrow_info *csrow, char *data,
 145                                 int private)
 146 {
 147         return sprintf(data, "%u\n", csrow->ue_count);
 148 }
 149
 150 static ssize_t csrow_ce_count_show(struct csrow_info *csrow, char *data,
 151                                 int private)
 152 {
 153         return sprintf(data, "%u\n", csrow->ce_count);
 154 }
 155
 156 static ssize_t csrow_size_show(struct csrow_info *csrow, char *data,
 157                                 int private)
 158 {
 159         return sprintf(data, "%u\n", PAGES_TO_MiB(csrow->nr_pages));
 160 }
 161
 162 static ssize_t csrow_mem_type_show(struct csrow_info *csrow, char *data,
 163                                 int private)
 164 {
 165         return sprintf(data, "%s\n", mem_types[csrow->mtype]);
 166 }
 167
 168 static ssize_t csrow_dev_type_show(struct csrow_info *csrow, char *data,
 169                                 int private)
 170 {
 171         return sprintf(data, "%s\n", dev_types[csrow->dtype]);
 172 }
 173
 174 static ssize_t csrow_edac_mode_show(struct csrow_info *csrow, char *data,
 175                                 int private)
 176 {
 177         return sprintf(data, "%s\n", edac_caps[csrow->edac_mode]);
 178 }
 179
 180 /* show/store functions for DIMM Label attributes */
 181 static ssize_t channel_dimm_label_show(struct csrow_info *csrow,
 182                                 char *data, int channel)
 183 {
 184         /* if field has not been initialized, there is nothing to send */
 185         if (!csrow->channels[channel].label[0])
 186                 return 0;
 187
 188         return snprintf(data, EDAC_MC_LABEL_LEN, "%s\n",
 189                         csrow->channels[channel].label);
 190 }
 191
 192 static ssize_t channel_dimm_label_store(struct csrow_info *csrow,
 193                                         const char *data,
 194                                         size_t count, int channel)
 195 {
 196         ssize_t max_size = 0;
 197
 198         max_size = min((ssize_t) count, (ssize_t) EDAC_MC_LABEL_LEN - 1);
 199         strncpy(csrow->channels[channel].label, data, max_size);
 200         csrow->channels[channel].label[max_size] = '\0';
 201
 202         return max_size;
 203 }
 204
 205 /* show function for dynamic chX_ce_count attribute */
 206 static ssize_t channel_ce_count_show(struct csrow_info *csrow,
 207                                 char *data, int channel)
 208 {
 209         return sprintf(data, "%u\n", csrow->channels[channel].ce_count);
 210 }
 211
 212 /* csrow specific attribute structure */
 213 struct csrowdev_attribute {
 214         struct attribute attr;
 215          ssize_t(*show) (struct csrow_info *, char *, int);
 216          ssize_t(*store) (struct csrow_info *, const char *, size_t, int);
 217         int private;
 218 };
 219
 220 #define to_csrow(k) container_of(k, struct csrow_info, kobj)
 221 #define to_csrowdev_attr(a) container_of(a, struct csrowdev_attribute, attr)
 222
 223 /* Set of show/store higher level functions for default csrow attributes */
 224 static ssize_t csrowdev_show(struct kobject *kobj,
 225                         struct attribute *attr, char *buffer)
 226 {
 227         struct csrow_info *csrow = to_csrow(kobj);
 228         struct csrowdev_attribute *csrowdev_attr = to_csrowdev_attr(attr);
 229
 230         if (csrowdev_attr->show)
 231                 return csrowdev_attr->show(csrow,
 232                                         buffer, csrowdev_attr->private);
 233         return -EIO;
 234 }
 235
 236 static ssize_t csrowdev_store(struct kobject *kobj, struct attribute *attr,
 237                         const char *buffer, size_t count)
 238 {
 239         struct csrow_info *csrow = to_csrow(kobj);
 240         struct csrowdev_attribute *csrowdev_attr = to_csrowdev_attr(attr);
 241
 242         if (csrowdev_attr->store)
 243                 return csrowdev_attr->store(csrow,
 244                                         buffer,
 245                                         count, csrowdev_attr->private);
 246         return -EIO;
 247 }
 248
 249 static const struct sysfs_ops csrowfs_ops = {
 250         .show = csrowdev_show,
 251         .store = csrowdev_store
 252 };
 253
 254 #define CSROWDEV_ATTR(_name,_mode,_show,_store,_private)        \
 255 static struct csrowdev_attribute attr_##_name = {                       \
 256         .attr = {.name = __stringify(_name), .mode = _mode },   \
 257         .show   = _show,                                        \
 258         .store  = _store,                                       \
 259         .private = _private,                                    \
 260 };
 261
 262 /* default cwrow<id>/attribute files */
 263 CSROWDEV_ATTR(size_mb, S_IRUGO, csrow_size_show, NULL, 0);
 264 CSROWDEV_ATTR(dev_type, S_IRUGO, csrow_dev_type_show, NULL, 0);
 265 CSROWDEV_ATTR(mem_type, S_IRUGO, csrow_mem_type_show, NULL, 0);
 266 CSROWDEV_ATTR(edac_mode, S_IRUGO, csrow_edac_mode_show, NULL, 0);
 267 CSROWDEV_ATTR(ue_count, S_IRUGO, csrow_ue_count_show, NULL, 0);
 268 CSROWDEV_ATTR(ce_count, S_IRUGO, csrow_ce_count_show, NULL, 0);
 269
 270 /* default attributes of the CSROW<id> object */
 271 static struct csrowdev_attribute *default_csrow_attr[] = {
 272         &attr_dev_type,
 273         &attr_mem_type,
 274         &attr_edac_mode,
 275         &attr_size_mb,
 276         &attr_ue_count,
 277         &attr_ce_count,
 278         NULL,
 279 };
 280
 281 /* possible dynamic channel DIMM Label attribute files */
 282 CSROWDEV_ATTR(ch0_dimm_label, S_IRUGO | S_IWUSR,
 283         channel_dimm_label_show, channel_dimm_label_store, 0);
 284 CSROWDEV_ATTR(ch1_dimm_label, S_IRUGO | S_IWUSR,
 285         channel_dimm_label_show, channel_dimm_label_store, 1);
 286 CSROWDEV_ATTR(ch2_dimm_label, S_IRUGO | S_IWUSR,
 287         channel_dimm_label_show, channel_dimm_label_store, 2);
 288 CSROWDEV_ATTR(ch3_dimm_label, S_IRUGO | S_IWUSR,
 289         channel_dimm_label_show, channel_dimm_label_store, 3);
 290 CSROWDEV_ATTR(ch4_dimm_label, S_IRUGO | S_IWUSR,
 291         channel_dimm_label_show, channel_dimm_label_store, 4);
 292 CSROWDEV_ATTR(ch5_dimm_label, S_IRUGO | S_IWUSR,
 293         channel_dimm_label_show, channel_dimm_label_store, 5);
 294
 295 /* Total possible dynamic DIMM Label attribute file table */
 296 static struct csrowdev_attribute *dynamic_csrow_dimm_attr[] = {
 297         &attr_ch0_dimm_label,
 298         &attr_ch1_dimm_label,
 299         &attr_ch2_dimm_label,
 300         &attr_ch3_dimm_label,
 301         &attr_ch4_dimm_label,
 302         &attr_ch5_dimm_label
 303 };
 304
 305 /* possible dynamic channel ce_count attribute files */
 306 CSROWDEV_ATTR(ch0_ce_count, S_IRUGO | S_IWUSR, channel_ce_count_show, NULL, 0);
 307 CSROWDEV_ATTR(ch1_ce_count, S_IRUGO | S_IWUSR, channel_ce_count_show, NULL, 1);
 308 CSROWDEV_ATTR(ch2_ce_count, S_IRUGO | S_IWUSR, channel_ce_count_show, NULL, 2);
 309 CSROWDEV_ATTR(ch3_ce_count, S_IRUGO | S_IWUSR, channel_ce_count_show, NULL, 3);
 310 CSROWDEV_ATTR(ch4_ce_count, S_IRUGO | S_IWUSR, channel_ce_count_show, NULL, 4);
 311 CSROWDEV_ATTR(ch5_ce_count, S_IRUGO | S_IWUSR, channel_ce_count_show, NULL, 5);
 312
 313 /* Total possible dynamic ce_count attribute file table */
 314 static struct csrowdev_attribute *dynamic_csrow_ce_count_attr[] = {
 315         &attr_ch0_ce_count,
 316         &attr_ch1_ce_count,
 317         &attr_ch2_ce_count,
 318         &attr_ch3_ce_count,
 319         &attr_ch4_ce_count,
 320         &attr_ch5_ce_count
 321 };
 322
 323 #define EDAC_NR_CHANNELS        6
 324
 325 /* Create dynamic CHANNEL files, indexed by 'chan',  under specifed CSROW */
 326 static int edac_create_channel_files(struct kobject *kobj, int chan)
 327 {
 328         int err = -ENODEV;
 329
 330         if (chan >= EDAC_NR_CHANNELS)
 331                 return err;
 332
 333         /* create the DIMM label attribute file */
 334         err = sysfs_create_file(kobj,
 335                                 (struct attribute *)
 336                                 dynamic_csrow_dimm_attr[chan]);
 337
 338         if (!err) {
 339                 /* create the CE Count attribute file */
 340                 err = sysfs_create_file(kobj,
 341                                         (struct attribute *)
 342                                         dynamic_csrow_ce_count_attr[chan]);
 343         } else {
 344                 debugf1("%s()  dimm labels and ce_count files created",
 345                         __func__);
 346         }
 347
 348         return err;
 349 }
 350
 351 /* No memory to release for this kobj */
 352 static void edac_csrow_instance_release(struct kobject *kobj)
 353 {
 354         struct mem_ctl_info *mci;
 355         struct csrow_info *cs;
 356
 357         debugf1("%s()\n", __func__);
 358
 359         cs = container_of(kobj, struct csrow_info, kobj);
 360         mci = cs->mci;
 361
 362         kobject_put(&mci->edac_mci_kobj);
 363 }
 364
 365 /* the kobj_type instance for a CSROW */
 366 static struct kobj_type ktype_csrow = {
 367         .release = edac_csrow_instance_release,
 368         .sysfs_ops = &csrowfs_ops,
 369         .default_attrs = (struct attribute **)default_csrow_attr,
 370 };
 371
 372 /* Create a CSROW object under specifed edac_mc_device */
 373 static int edac_create_csrow_object(struct mem_ctl_info *mci,
 374                                         struct csrow_info *csrow, int index)
 375 {
 376         struct kobject *kobj_mci = &mci->edac_mci_kobj;
 377         struct kobject *kobj;
 378         int chan;
 379         int err;
 380
 381         /* generate ..../edac/mc/mc<id>/csrow<index>   */
 382         memset(&csrow->kobj, 0, sizeof(csrow->kobj));
 383         csrow->mci = mci;       /* include container up link */
 384
 385         /* bump the mci instance's kobject's ref count */
 386         kobj = kobject_get(&mci->edac_mci_kobj);
 387         if (!kobj) {
 388                 err = -ENODEV;
 389                 goto err_out;
 390         }
 391
 392         /* Instanstiate the csrow object */
 393         err = kobject_init_and_add(&csrow->kobj, &ktype_csrow, kobj_mci,
 394                                    "csrow%d", index);
 395         if (err)
 396                 goto err_release_top_kobj;
 397
 398         /* At this point, to release a csrow kobj, one must
 399          * call the kobject_put and allow that tear down
 400          * to work the releasing
 401          */
 402
 403         /* Create the dyanmic attribute files on this csrow,
 404          * namely, the DIMM labels and the channel ce_count
 405          */
 406         for (chan = 0; chan < csrow->nr_channels; chan++) {
 407                 err = edac_create_channel_files(&csrow->kobj, chan);
 408                 if (err) {
 409                         /* special case the unregister here */
 410                         kobject_put(&csrow->kobj);
 411                         goto err_out;
 412                 }
 413         }
 414         kobject_uevent(&csrow->kobj, KOBJ_ADD);
 415         return 0;
 416
 417         /* error unwind stack */
 418 err_release_top_kobj:
 419         kobject_put(&mci->edac_mci_kobj);
 420
 421 err_out:
 422         return err;
 423 }
 424
 425 /* default sysfs methods and data structures for the main MCI kobject */
 426
 427 static ssize_t mci_reset_counters_store(struct mem_ctl_info *mci,
 428                                         const char *data, size_t count)
 429 {
 430         int row, chan;
 431
 432         mci->ue_noinfo_count = 0;
 433         mci->ce_noinfo_count = 0;
 434         mci->ue_count = 0;
 435         mci->ce_count = 0;
 436
 437         for (row = 0; row < mci->nr_csrows; row++) {
 438                 struct csrow_info *ri = &mci->csrows[row];
 439
 440                 ri->ue_count = 0;
 441                 ri->ce_count = 0;
 442
 443                 for (chan = 0; chan < ri->nr_channels; chan++)
 444                         ri->channels[chan].ce_count = 0;
 445         }
 446
 447         mci->start_time = jiffies;
 448         return count;
 449 }
 450
 451 /* memory scrubbing */
 452 static ssize_t mci_sdram_scrub_rate_store(struct mem_ctl_info *mci,
 453                                         const char *data, size_t count)
 454 {
 455         u32 bandwidth = -1;
 456
 457         if (mci->set_sdram_scrub_rate) {
 458
 459                 memctrl_int_store(&bandwidth, data, count);
 460
 461                 if (!(*mci->set_sdram_scrub_rate) (mci, &bandwidth)) {
 462                         edac_printk(KERN_DEBUG, EDAC_MC,
 463                                 "Scrub rate set successfully, applied: %d\n",
 464                                 bandwidth);
 465                 } else {
 466                         /* FIXME: error codes maybe? */
 467                         edac_printk(KERN_DEBUG, EDAC_MC,
 468                                 "Scrub rate set FAILED, could not apply: %d\n",
 469                                 bandwidth);
 470                 }
 471         } else {
 472                 /* FIXME: produce "not implemented" ERROR for user-side. */
 473                 edac_printk(KERN_WARNING, EDAC_MC,
 474                         "Memory scrubbing 'set'control is not implemented!\n");
 475         }
 476         return count;
 477 }
 478
 479 static ssize_t mci_sdram_scrub_rate_show(struct mem_ctl_info *mci, char *data)
 480 {
 481         u32 bandwidth = -1;
 482
 483         if (mci->get_sdram_scrub_rate) {
 484                 if (!(*mci->get_sdram_scrub_rate) (mci, &bandwidth)) {
 485                         edac_printk(KERN_DEBUG, EDAC_MC,
 486                                 "Scrub rate successfully, fetched: %d\n",
 487                                 bandwidth);
 488                 } else {
 489                         /* FIXME: error codes maybe? */
 490                         edac_printk(KERN_DEBUG, EDAC_MC,
 491                                 "Scrub rate fetch FAILED, got: %d\n",
 492                                 bandwidth);
 493                 }
 494         } else {
 495                 /* FIXME: produce "not implemented" ERROR for user-side.  */
 496                 edac_printk(KERN_WARNING, EDAC_MC,
 497                         "Memory scrubbing 'get' control is not implemented\n");
 498         }
 499         return sprintf(data, "%d\n", bandwidth);
 500 }
 501
 502 /* default attribute files for the MCI object */
 503 static ssize_t mci_ue_count_show(struct mem_ctl_info *mci, char *data)
 504 {
 505         return sprintf(data, "%d\n", mci->ue_count);
 506 }
 507
 508 static ssize_t mci_ce_count_show(struct mem_ctl_info *mci, char *data)
 509 {
 510         return sprintf(data, "%d\n", mci->ce_count);
 511 }
 512
 513 static ssize_t mci_ce_noinfo_show(struct mem_ctl_info *mci, char *data)
 514 {
 515         return sprintf(data, "%d\n", mci->ce_noinfo_count);
 516 }
 517
 518 static ssize_t mci_ue_noinfo_show(struct mem_ctl_info *mci, char *data)
 519 {
 520         return sprintf(data, "%d\n", mci->ue_noinfo_count);
 521 }
 522
 523 static ssize_t mci_seconds_show(struct mem_ctl_info *mci, char *data)
 524 {
 525         return sprintf(data, "%ld\n", (jiffies - mci->start_time) / HZ);
 526 }
 527
 528 static ssize_t mci_ctl_name_show(struct mem_ctl_info *mci, char *data)
 529 {
 530         return sprintf(data, "%s\n", mci->ctl_name);
 531 }
 532
 533 static ssize_t mci_size_mb_show(struct mem_ctl_info *mci, char *data)
 534 {
 535         int total_pages, csrow_idx;
 536
 537         for (total_pages = csrow_idx = 0; csrow_idx < mci->nr_csrows;
 538                 csrow_idx++) {
 539                 struct csrow_info *csrow = &mci->csrows[csrow_idx];
 540
 541                 if (!csrow->nr_pages)
 542                         continue;
 543
 544                 total_pages += csrow->nr_pages;
 545         }
 546
 547         return sprintf(data, "%u\n", PAGES_TO_MiB(total_pages));
 548 }
 549
 550 #define to_mci(k) container_of(k, struct mem_ctl_info, edac_mci_kobj)
 551 #define to_mcidev_attr(a) container_of(a,struct mcidev_sysfs_attribute,attr)
 552
 553 /* MCI show/store functions for top most object */
 554 static ssize_t mcidev_show(struct kobject *kobj, struct attribute *attr,
 555                         char *buffer)
 556 {
 557         struct mem_ctl_info *mem_ctl_info = to_mci(kobj);
 558         struct mcidev_sysfs_attribute *mcidev_attr = to_mcidev_attr(attr);
 559
 560         if (mcidev_attr->show)
 561                 return mcidev_attr->show(mem_ctl_info, buffer);
 562
 563         return -EIO;
 564 }
 565
 566 static ssize_t mcidev_store(struct kobject *kobj, struct attribute *attr,
 567                         const char *buffer, size_t count)
 568 {
 569         struct mem_ctl_info *mem_ctl_info = to_mci(kobj);
 570         struct mcidev_sysfs_attribute *mcidev_attr = to_mcidev_attr(attr);
 571
 572         if (mcidev_attr->store)
 573                 return mcidev_attr->store(mem_ctl_info, buffer, count);
 574
 575         return -EIO;
 576 }
 577
 578 /* Intermediate show/store table */
 579 static const struct sysfs_ops mci_ops = {
 580         .show = mcidev_show,
 581         .store = mcidev_store
 582 };
 583
 584 #define MCIDEV_ATTR(_name,_mode,_show,_store)                   \
 585 static struct mcidev_sysfs_attribute mci_attr_##_name = {                       \
 586         .attr = {.name = __stringify(_name), .mode = _mode },   \
 587         .show   = _show,                                        \
 588         .store  = _store,                                       \
 589 };
 590
 591 /* default Control file */
 592 MCIDEV_ATTR(reset_counters, S_IWUSR, NULL, mci_reset_counters_store);
 593
 594 /* default Attribute files */
 595 MCIDEV_ATTR(mc_name, S_IRUGO, mci_ctl_name_show, NULL);
 596 MCIDEV_ATTR(size_mb, S_IRUGO, mci_size_mb_show, NULL);
 597 MCIDEV_ATTR(seconds_since_reset, S_IRUGO, mci_seconds_show, NULL);
 598 MCIDEV_ATTR(ue_noinfo_count, S_IRUGO, mci_ue_noinfo_show, NULL);
 599 MCIDEV_ATTR(ce_noinfo_count, S_IRUGO, mci_ce_noinfo_show, NULL);
 600 MCIDEV_ATTR(ue_count, S_IRUGO, mci_ue_count_show, NULL);
 601 MCIDEV_ATTR(ce_count, S_IRUGO, mci_ce_count_show, NULL);
 602
 603 /* memory scrubber attribute file */
 604 MCIDEV_ATTR(sdram_scrub_rate, S_IRUGO | S_IWUSR, mci_sdram_scrub_rate_show,
 605         mci_sdram_scrub_rate_store);
 606
 607 static struct mcidev_sysfs_attribute *mci_attr[] = {
 608         &mci_attr_reset_counters,
 609         &mci_attr_mc_name,
 610         &mci_attr_size_mb,
 611         &mci_attr_seconds_since_reset,
 612         &mci_attr_ue_noinfo_count,
 613         &mci_attr_ce_noinfo_count,
 614         &mci_attr_ue_count,
 615         &mci_attr_ce_count,
 616         &mci_attr_sdram_scrub_rate,
 617         NULL
 618 };
 619
 620
 621 /*
 622  * Release of a MC controlling instance
 623  *
 624  *      each MC control instance has the following resources upon entry:
 625  *              a) a ref count on the top memctl kobj
 626  *              b) a ref count on this module
 627  *
 628  *      this function must decrement those ref counts and then
 629  *      issue a free on the instance's memory
 630  */
 631 static void edac_mci_control_release(struct kobject *kobj)
 632 {
 633         struct mem_ctl_info *mci;
 634
 635         mci = to_mci(kobj);
 636
 637         debugf0("%s() mci instance idx=%d releasing\n", __func__, mci->mc_idx);
 638
 639         /* decrement the module ref count */
 640         module_put(mci->owner);
 641
 642         /* free the mci instance memory here */
 643         kfree(mci);
 644 }
 645
 646 static struct kobj_type ktype_mci = {
 647         .release = edac_mci_control_release,
 648         .sysfs_ops = &mci_ops,
 649         .default_attrs = (struct attribute **)mci_attr,
 650 };
 651
 652 /* EDAC memory controller sysfs kset:
 653  *      /sys/devices/system/edac/mc
 654  */
 655 static struct kset *mc_kset;
 656
 657 /*
 658  * edac_mc_register_sysfs_main_kobj
 659  *
 660  *      setups and registers the main kobject for each mci
 661  */
 662 int edac_mc_register_sysfs_main_kobj(struct mem_ctl_info *mci)
 663 {
 664         struct kobject *kobj_mci;
 665         int err;
 666
 667         debugf1("%s()\n", __func__);
 668
 669         kobj_mci = &mci->edac_mci_kobj;
 670
 671         /* Init the mci's kobject */
 672         memset(kobj_mci, 0, sizeof(*kobj_mci));
 673
 674         /* Record which module 'owns' this control structure
 675          * and bump the ref count of the module
 676          */
 677         mci->owner = THIS_MODULE;
 678
 679         /* bump ref count on this module */
 680         if (!try_module_get(mci->owner)) {
 681                 err = -ENODEV;
 682                 goto fail_out;
 683         }
 684
 685         /* this instance become part of the mc_kset */
 686         kobj_mci->kset = mc_kset;
 687
 688         /* register the mc<id> kobject to the mc_kset */
 689         err = kobject_init_and_add(kobj_mci, &ktype_mci, NULL,
 690                                    "mc%d", mci->mc_idx);
 691         if (err) {
 692                 debugf1("%s()Failed to register '.../edac/mc%d'\n",
 693                         __func__, mci->mc_idx);
 694                 goto kobj_reg_fail;
 695         }
 696         kobject_uevent(kobj_mci, KOBJ_ADD);
 697
 698         /* At this point, to 'free' the control struct,
 699          * edac_mc_unregister_sysfs_main_kobj() must be used
 700          */
 701
 702         debugf1("%s() Registered '.../edac/mc%d' kobject\n",
 703                 __func__, mci->mc_idx);
 704
 705         return 0;
 706
 707         /* Error exit stack */
 708
 709 kobj_reg_fail:
 710         module_put(mci->owner);
 711
 712 fail_out:
 713         return err;
 714 }
 715
 716 /*
 717  * edac_mc_register_sysfs_main_kobj
 718  *
 719  *      tears down and the main mci kobject from the mc_kset
 720  */
 721 void edac_mc_unregister_sysfs_main_kobj(struct mem_ctl_info *mci)
 722 {
 723         /* delete the kobj from the mc_kset */
 724         kobject_put(&mci->edac_mci_kobj);
 725 }
 726
 727 #define EDAC_DEVICE_SYMLINK     "device"
 728
 729 /*
 730  * edac_create_mci_instance_attributes
 731  *      create MC driver specific attributes at the topmost level
 732  *      directory of this mci instance.
 733  */
 734 static int edac_create_mci_instance_attributes(struct mem_ctl_info *mci)
 735 {
 736         int err;
 737         struct mcidev_sysfs_attribute *sysfs_attrib;
 738
 739         /* point to the start of the array and iterate over it
 740          * adding each attribute listed to this mci instance's kobject
 741          */
 742         sysfs_attrib = mci->mc_driver_sysfs_attributes;
 743
 744         while (sysfs_attrib && sysfs_attrib->attr.name) {
 745                 err = sysfs_create_file(&mci->edac_mci_kobj,
 746                                         (struct attribute*) sysfs_attrib);
 747                 if (err) {
 748                         return err;
 749                 }
 750
 751                 sysfs_attrib++;
 752         }
 753
 754         return 0;
 755 }
 756
 757 /*
 758  * edac_remove_mci_instance_attributes
 759  *      remove MC driver specific attributes at the topmost level
 760  *      directory of this mci instance.
 761  */
 762 static void edac_remove_mci_instance_attributes(struct mem_ctl_info *mci)
 763 {
 764         struct mcidev_sysfs_attribute *sysfs_attrib;
 765
 766         /* point to the start of the array and iterate over it
 767          * adding each attribute listed to this mci instance's kobject
 768          */
 769         sysfs_attrib = mci->mc_driver_sysfs_attributes;
 770
 771         /* loop if there are attributes and until we hit a NULL entry */
 772         while (sysfs_attrib && sysfs_attrib->attr.name) {
 773                 sysfs_remove_file(&mci->edac_mci_kobj,
 774                                         (struct attribute *) sysfs_attrib);
 775                 sysfs_attrib++;
 776         }
 777 }
 778
 779
 780 /*
 781  * Create a new Memory Controller kobject instance,
 782  *      mc<id> under the 'mc' directory
 783  *
 784  * Return:
 785  *      0       Success
 786  *      !0      Failure
 787  */
 788 int edac_create_sysfs_mci_device(struct mem_ctl_info *mci)
 789 {
 790         int i;
 791         int err;
 792         struct csrow_info *csrow;
 793         struct kobject *kobj_mci = &mci->edac_mci_kobj;
 794
 795         debugf0("%s() idx=%d\n", __func__, mci->mc_idx);
 796
 797         /* create a symlink for the device */
 798         err = sysfs_create_link(kobj_mci, &mci->dev->kobj,
 799                                 EDAC_DEVICE_SYMLINK);
 800         if (err) {
 801                 debugf1("%s() failure to create symlink\n", __func__);
 802                 goto fail0;
 803         }
 804
 805         /* If the low level driver desires some attributes,
 806          * then create them now for the driver.
 807          */
 808         if (mci->mc_driver_sysfs_attributes) {
 809                 err = edac_create_mci_instance_attributes(mci);
 810                 if (err) {
 811                         debugf1("%s() failure to create mci attributes\n",
 812                                 __func__);
 813                         goto fail0;
 814                 }
 815         }
 816
 817         /* Make directories for each CSROW object under the mc<id> kobject
 818          */
 819         for (i = 0; i < mci->nr_csrows; i++) {
 820                 csrow = &mci->csrows[i];
 821
 822                 /* Only expose populated CSROWs */
 823                 if (csrow->nr_pages > 0) {
 824                         err = edac_create_csrow_object(mci, csrow, i);
 825                         if (err) {
 826                                 debugf1("%s() failure: create csrow %d obj\n",
 827                                         __func__, i);
 828                                 goto fail1;
 829                         }
 830                 }
 831         }
 832
 833         return 0;
 834
 835         /* CSROW error: backout what has already been registered,  */
 836 fail1:
 837         for (i--; i >= 0; i--) {
 838                 if (csrow->nr_pages > 0) {
 839                         kobject_put(&mci->csrows[i].kobj);
 840                 }
 841         }
 842
 843         /* remove the mci instance's attributes, if any */
 844         edac_remove_mci_instance_attributes(mci);
 845
 846         /* remove the symlink */
 847         sysfs_remove_link(kobj_mci, EDAC_DEVICE_SYMLINK);
 848
 849 fail0:
 850         return err;
 851 }
 852
 853 /*
 854  * remove a Memory Controller instance
 855  */
 856 void edac_remove_sysfs_mci_device(struct mem_ctl_info *mci)
 857 {
 858         int i;
 859
 860         debugf0("%s()\n", __func__);
 861
 862         /* remove all csrow kobjects */
 863         for (i = 0; i < mci->nr_csrows; i++) {
 864                 if (mci->csrows[i].nr_pages > 0) {
 865                         debugf0("%s()  unreg csrow-%d\n", __func__, i);
 866                         kobject_put(&mci->csrows[i].kobj);
 867                 }
 868         }
 869
 870         debugf0("%s()  remove_link\n", __func__);
 871
 872         /* remove the symlink */
 873         sysfs_remove_link(&mci->edac_mci_kobj, EDAC_DEVICE_SYMLINK);
 874
 875         debugf0("%s()  remove_mci_instance\n", __func__);
 876
 877         /* remove this mci instance's attribtes */
 878         edac_remove_mci_instance_attributes(mci);
 879
 880         debugf0("%s()  unregister this mci kobj\n", __func__);
 881
 882         /* unregister this instance's kobject */
 883         kobject_put(&mci->edac_mci_kobj);
 884 }
 885
 886
 887
 888
 889 /*
 890  * edac_setup_sysfs_mc_kset(void)
 891  *
 892  * Initialize the mc_kset for the 'mc' entry
 893  *      This requires creating the top 'mc' directory with a kset
 894  *      and its controls/attributes.
 895  *
 896  *      To this 'mc' kset, instance 'mci' will be grouped as children.
 897  *
 898  * Return:  0 SUCCESS
 899  *         !0 FAILURE error code
 900  */
 901 int edac_sysfs_setup_mc_kset(void)
 902 {
 903         int err = 0;
 904         struct sysdev_class *edac_class;
 905
 906         debugf1("%s()\n", __func__);
 907
 908         /* get the /sys/devices/system/edac class reference */
 909         edac_class = edac_get_edac_class();
 910         if (edac_class == NULL) {
 911                 debugf1("%s() no edac_class error=%d\n", __func__, err);
 912                 goto fail_out;
 913         }
 914
 915         /* Init the MC's kobject */
 916         mc_kset = kset_create_and_add("mc", NULL, &edac_class->kset.kobj);
 917         if (!mc_kset) {
 918                 err = -ENOMEM;
 919                 debugf1("%s() Failed to register '.../edac/mc'\n", __func__);
 920                 goto fail_out;
 921         }
 922
 923         debugf1("%s() Registered '.../edac/mc' kobject\n", __func__);
 924
 925         return 0;
 926
 927
 928         /* error unwind stack */
 929 fail_out:
 930         return err;
 931 }
 932
 933 /*
 934  * edac_sysfs_teardown_mc_kset
 935  *
 936  *      deconstruct the mc_ket for memory controllers
 937  */
 938 void edac_sysfs_teardown_mc_kset(void)
 939 {
 940         kset_unregister(mc_kset);
 941 }
 942