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