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 /* Parameter declarations for above */
  48 module_param(edac_mc_panic_on_ue, int, 0644);
  49 MODULE_PARM_DESC(edac_mc_panic_on_ue, "Panic on uncorrected error: 0=off 1=on");
  50 module_param(edac_mc_log_ue, int, 0644);
  51 MODULE_PARM_DESC(edac_mc_log_ue,
  52                  "Log uncorrectable error to console: 0=off 1=on");
  53 module_param(edac_mc_log_ce, int, 0644);
  54 MODULE_PARM_DESC(edac_mc_log_ce,
  55                  "Log correctable error to console: 0=off 1=on");
  56 module_param(edac_mc_poll_msec, int, 0644);
  57 MODULE_PARM_DESC(edac_mc_poll_msec, "Polling period in milliseconds");
  58
  59 /*
  60  * various constants for Memory Controllers
  61  */
  62 static const char *mem_types[] = {
  63         [MEM_EMPTY] = "Empty",
  64         [MEM_RESERVED] = "Reserved",
  65         [MEM_UNKNOWN] = "Unknown",
  66         [MEM_FPM] = "FPM",
  67         [MEM_EDO] = "EDO",
  68         [MEM_BEDO] = "BEDO",
  69         [MEM_SDR] = "Unbuffered-SDR",
  70         [MEM_RDR] = "Registered-SDR",
  71         [MEM_DDR] = "Unbuffered-DDR",
  72         [MEM_RDDR] = "Registered-DDR",
  73         [MEM_RMBS] = "RMBS",
  74         [MEM_DDR2] = "Unbuffered-DDR2",
  75         [MEM_FB_DDR2] = "FullyBuffered-DDR2",
  76         [MEM_RDDR2] = "Registered-DDR2"
  77 };
  78
  79 static const char *dev_types[] = {
  80         [DEV_UNKNOWN] = "Unknown",
  81         [DEV_X1] = "x1",
  82         [DEV_X2] = "x2",
  83         [DEV_X4] = "x4",
  84         [DEV_X8] = "x8",
  85         [DEV_X16] = "x16",
  86         [DEV_X32] = "x32",
  87         [DEV_X64] = "x64"
  88 };
  89
  90 static const char *edac_caps[] = {
  91         [EDAC_UNKNOWN] = "Unknown",
  92         [EDAC_NONE] = "None",
  93         [EDAC_RESERVED] = "Reserved",
  94         [EDAC_PARITY] = "PARITY",
  95         [EDAC_EC] = "EC",
  96         [EDAC_SECDED] = "SECDED",
  97         [EDAC_S2ECD2ED] = "S2ECD2ED",
  98         [EDAC_S4ECD4ED] = "S4ECD4ED",
  99         [EDAC_S8ECD8ED] = "S8ECD8ED",
 100         [EDAC_S16ECD16ED] = "S16ECD16ED"
 101 };
 102
 103
 104
 105 /*
 106  * /sys/devices/system/edac/mc;
 107  *      data structures and methods
 108  */
 109 static ssize_t memctrl_int_show(void *ptr, char *buffer)
 110 {
 111         int *value = (int *)ptr;
 112         return sprintf(buffer, "%u\n", *value);
 113 }
 114
 115 static ssize_t memctrl_int_store(void *ptr, const char *buffer, size_t count)
 116 {
 117         int *value = (int *)ptr;
 118
 119         if (isdigit(*buffer))
 120                 *value = simple_strtoul(buffer, NULL, 0);
 121
 122         return count;
 123 }
 124
 125
 126 /* EDAC sysfs CSROW data structures and methods
 127  */
 128
 129 /* Set of more default csrow<id> attribute show/store functions */
 130 static ssize_t csrow_ue_count_show(struct csrow_info *csrow, char *data,
 131                                 int private)
 132 {
 133         return sprintf(data, "%u\n", csrow->ue_count);
 134 }
 135
 136 static ssize_t csrow_ce_count_show(struct csrow_info *csrow, char *data,
 137                                 int private)
 138 {
 139         return sprintf(data, "%u\n", csrow->ce_count);
 140 }
 141
 142 static ssize_t csrow_size_show(struct csrow_info *csrow, char *data,
 143                                 int private)
 144 {
 145         return sprintf(data, "%u\n", PAGES_TO_MiB(csrow->nr_pages));
 146 }
 147
 148 static ssize_t csrow_mem_type_show(struct csrow_info *csrow, char *data,
 149                                 int private)
 150 {
 151         return sprintf(data, "%s\n", mem_types[csrow->mtype]);
 152 }
 153
 154 static ssize_t csrow_dev_type_show(struct csrow_info *csrow, char *data,
 155                                 int private)
 156 {
 157         return sprintf(data, "%s\n", dev_types[csrow->dtype]);
 158 }
 159
 160 static ssize_t csrow_edac_mode_show(struct csrow_info *csrow, char *data,
 161                                 int private)
 162 {
 163         return sprintf(data, "%s\n", edac_caps[csrow->edac_mode]);
 164 }
 165
 166 /* show/store functions for DIMM Label attributes */
 167 static ssize_t channel_dimm_label_show(struct csrow_info *csrow,
 168                                 char *data, int channel)
 169 {
 170         return snprintf(data, EDAC_MC_LABEL_LEN, "%s",
 171                         csrow->channels[channel].label);
 172 }
 173
 174 static ssize_t channel_dimm_label_store(struct csrow_info *csrow,
 175                                         const char *data,
 176                                         size_t count, int channel)
 177 {
 178         ssize_t max_size = 0;
 179
 180         max_size = min((ssize_t) count, (ssize_t) EDAC_MC_LABEL_LEN - 1);
 181         strncpy(csrow->channels[channel].label, data, max_size);
 182         csrow->channels[channel].label[max_size] = '\0';
 183
 184         return max_size;
 185 }
 186
 187 /* show function for dynamic chX_ce_count attribute */
 188 static ssize_t channel_ce_count_show(struct csrow_info *csrow,
 189                                 char *data, int channel)
 190 {
 191         return sprintf(data, "%u\n", csrow->channels[channel].ce_count);
 192 }
 193
 194 /* csrow specific attribute structure */
 195 struct csrowdev_attribute {
 196         struct attribute attr;
 197          ssize_t(*show) (struct csrow_info *, char *, int);
 198          ssize_t(*store) (struct csrow_info *, const char *, size_t, int);
 199         int private;
 200 };
 201
 202 #define to_csrow(k) container_of(k, struct csrow_info, kobj)
 203 #define to_csrowdev_attr(a) container_of(a, struct csrowdev_attribute, attr)
 204
 205 /* Set of show/store higher level functions for default csrow attributes */
 206 static ssize_t csrowdev_show(struct kobject *kobj,
 207                         struct attribute *attr, char *buffer)
 208 {
 209         struct csrow_info *csrow = to_csrow(kobj);
 210         struct csrowdev_attribute *csrowdev_attr = to_csrowdev_attr(attr);
 211
 212         if (csrowdev_attr->show)
 213                 return csrowdev_attr->show(csrow,
 214                                         buffer, csrowdev_attr->private);
 215         return -EIO;
 216 }
 217
 218 static ssize_t csrowdev_store(struct kobject *kobj, struct attribute *attr,
 219                         const char *buffer, size_t count)
 220 {
 221         struct csrow_info *csrow = to_csrow(kobj);
 222         struct csrowdev_attribute *csrowdev_attr = to_csrowdev_attr(attr);
 223
 224         if (csrowdev_attr->store)
 225                 return csrowdev_attr->store(csrow,
 226                                         buffer,
 227                                         count, csrowdev_attr->private);
 228         return -EIO;
 229 }
 230
 231 static struct sysfs_ops csrowfs_ops = {
 232         .show = csrowdev_show,
 233         .store = csrowdev_store
 234 };
 235
 236 #define CSROWDEV_ATTR(_name,_mode,_show,_store,_private)        \
 237 static struct csrowdev_attribute attr_##_name = {                       \
 238         .attr = {.name = __stringify(_name), .mode = _mode },   \
 239         .show   = _show,                                        \
 240         .store  = _store,                                       \
 241         .private = _private,                                    \
 242 };
 243
 244 /* default cwrow<id>/attribute files */
 245 CSROWDEV_ATTR(size_mb, S_IRUGO, csrow_size_show, NULL, 0);
 246 CSROWDEV_ATTR(dev_type, S_IRUGO, csrow_dev_type_show, NULL, 0);
 247 CSROWDEV_ATTR(mem_type, S_IRUGO, csrow_mem_type_show, NULL, 0);
 248 CSROWDEV_ATTR(edac_mode, S_IRUGO, csrow_edac_mode_show, NULL, 0);
 249 CSROWDEV_ATTR(ue_count, S_IRUGO, csrow_ue_count_show, NULL, 0);
 250 CSROWDEV_ATTR(ce_count, S_IRUGO, csrow_ce_count_show, NULL, 0);
 251
 252 /* default attributes of the CSROW<id> object */
 253 static struct csrowdev_attribute *default_csrow_attr[] = {
 254         &attr_dev_type,
 255         &attr_mem_type,
 256         &attr_edac_mode,
 257         &attr_size_mb,
 258         &attr_ue_count,
 259         &attr_ce_count,
 260         NULL,
 261 };
 262
 263 /* possible dynamic channel DIMM Label attribute files */
 264 CSROWDEV_ATTR(ch0_dimm_label, S_IRUGO | S_IWUSR,
 265         channel_dimm_label_show, channel_dimm_label_store, 0);
 266 CSROWDEV_ATTR(ch1_dimm_label, S_IRUGO | S_IWUSR,
 267         channel_dimm_label_show, channel_dimm_label_store, 1);
 268 CSROWDEV_ATTR(ch2_dimm_label, S_IRUGO | S_IWUSR,
 269         channel_dimm_label_show, channel_dimm_label_store, 2);
 270 CSROWDEV_ATTR(ch3_dimm_label, S_IRUGO | S_IWUSR,
 271         channel_dimm_label_show, channel_dimm_label_store, 3);
 272 CSROWDEV_ATTR(ch4_dimm_label, S_IRUGO | S_IWUSR,
 273         channel_dimm_label_show, channel_dimm_label_store, 4);
 274 CSROWDEV_ATTR(ch5_dimm_label, S_IRUGO | S_IWUSR,
 275         channel_dimm_label_show, channel_dimm_label_store, 5);
 276
 277 /* Total possible dynamic DIMM Label attribute file table */
 278 static struct csrowdev_attribute *dynamic_csrow_dimm_attr[] = {
 279         &attr_ch0_dimm_label,
 280         &attr_ch1_dimm_label,
 281         &attr_ch2_dimm_label,
 282         &attr_ch3_dimm_label,
 283         &attr_ch4_dimm_label,
 284         &attr_ch5_dimm_label
 285 };
 286
 287 /* possible dynamic channel ce_count attribute files */
 288 CSROWDEV_ATTR(ch0_ce_count, S_IRUGO | S_IWUSR, channel_ce_count_show, NULL, 0);
 289 CSROWDEV_ATTR(ch1_ce_count, S_IRUGO | S_IWUSR, channel_ce_count_show, NULL, 1);
 290 CSROWDEV_ATTR(ch2_ce_count, S_IRUGO | S_IWUSR, channel_ce_count_show, NULL, 2);
 291 CSROWDEV_ATTR(ch3_ce_count, S_IRUGO | S_IWUSR, channel_ce_count_show, NULL, 3);
 292 CSROWDEV_ATTR(ch4_ce_count, S_IRUGO | S_IWUSR, channel_ce_count_show, NULL, 4);
 293 CSROWDEV_ATTR(ch5_ce_count, S_IRUGO | S_IWUSR, channel_ce_count_show, NULL, 5);
 294
 295 /* Total possible dynamic ce_count attribute file table */
 296 static struct csrowdev_attribute *dynamic_csrow_ce_count_attr[] = {
 297         &attr_ch0_ce_count,
 298         &attr_ch1_ce_count,
 299         &attr_ch2_ce_count,
 300         &attr_ch3_ce_count,
 301         &attr_ch4_ce_count,
 302         &attr_ch5_ce_count
 303 };
 304
 305 #define EDAC_NR_CHANNELS        6
 306
 307 /* Create dynamic CHANNEL files, indexed by 'chan',  under specifed CSROW */
 308 static int edac_create_channel_files(struct kobject *kobj, int chan)
 309 {
 310         int err = -ENODEV;
 311
 312         if (chan >= EDAC_NR_CHANNELS)
 313                 return err;
 314
 315         /* create the DIMM label attribute file */
 316         err = sysfs_create_file(kobj,
 317                                 (struct attribute *)
 318                                 dynamic_csrow_dimm_attr[chan]);
 319
 320         if (!err) {
 321                 /* create the CE Count attribute file */
 322                 err = sysfs_create_file(kobj,
 323                                         (struct attribute *)
 324                                         dynamic_csrow_ce_count_attr[chan]);
 325         } else {
 326                 debugf1("%s()  dimm labels and ce_count files created",
 327                         __func__);
 328         }
 329
 330         return err;
 331 }
 332
 333 /* No memory to release for this kobj */
 334 static void edac_csrow_instance_release(struct kobject *kobj)
 335 {
 336         struct mem_ctl_info *mci;
 337         struct csrow_info *cs;
 338
 339         debugf1("%s()\n", __func__);
 340
 341         cs = container_of(kobj, struct csrow_info, kobj);
 342         mci = cs->mci;
 343
 344         kobject_put(&mci->edac_mci_kobj);
 345 }
 346
 347 /* the kobj_type instance for a CSROW */
 348 static struct kobj_type ktype_csrow = {
 349         .release = edac_csrow_instance_release,
 350         .sysfs_ops = &csrowfs_ops,
 351         .default_attrs = (struct attribute **)default_csrow_attr,
 352 };
 353
 354 /* Create a CSROW object under specifed edac_mc_device */
 355 static int edac_create_csrow_object(struct mem_ctl_info *mci,
 356                                         struct csrow_info *csrow, int index)
 357 {
 358         struct kobject *kobj_mci = &mci->edac_mci_kobj;
 359         struct kobject *kobj;
 360         int chan;
 361         int err;
 362
 363         /* generate ..../edac/mc/mc<id>/csrow<index>   */
 364         memset(&csrow->kobj, 0, sizeof(csrow->kobj));
 365         csrow->mci = mci;       /* include container up link */
 366         csrow->kobj.parent = kobj_mci;
 367         csrow->kobj.ktype = &ktype_csrow;
 368
 369         /* name this instance of csrow<id> */
 370         err = kobject_set_name(&csrow->kobj, "csrow%d", index);
 371         if (err)
 372                 goto err_out;
 373
 374         /* bump the mci instance's kobject's ref count */
 375         kobj = kobject_get(&mci->edac_mci_kobj);
 376         if (!kobj) {
 377                 err = -ENODEV;
 378                 goto err_out;
 379         }
 380
 381         /* Instanstiate the csrow object */
 382         err = kobject_register(&csrow->kobj);
 383         if (err)
 384                 goto err_release_top_kobj;
 385
 386         /* At this point, to release a csrow kobj, one must
 387          * call the kobject_unregister and allow that tear down
 388          * to work the releasing
 389          */
 390
 391         /* Create the dyanmic attribute files on this csrow,
 392          * namely, the DIMM labels and the channel ce_count
 393          */
 394         for (chan = 0; chan < csrow->nr_channels; chan++) {
 395                 err = edac_create_channel_files(&csrow->kobj, chan);
 396                 if (err) {
 397                         /* special case the unregister here */
 398                         kobject_unregister(&csrow->kobj);
 399                         goto err_out;
 400                 }
 401         }
 402
 403         return 0;
 404
 405         /* error unwind stack */
 406 err_release_top_kobj:
 407         kobject_put(&mci->edac_mci_kobj);
 408
 409 err_out:
 410         return err;
 411 }
 412
 413 /* default sysfs methods and data structures for the main MCI kobject */
 414
 415 static ssize_t mci_reset_counters_store(struct mem_ctl_info *mci,
 416                                         const char *data, size_t count)
 417 {
 418         int row, chan;
 419
 420         mci->ue_noinfo_count = 0;
 421         mci->ce_noinfo_count = 0;
 422         mci->ue_count = 0;
 423         mci->ce_count = 0;
 424
 425         for (row = 0; row < mci->nr_csrows; row++) {
 426                 struct csrow_info *ri = &mci->csrows[row];
 427
 428                 ri->ue_count = 0;
 429                 ri->ce_count = 0;
 430
 431                 for (chan = 0; chan < ri->nr_channels; chan++)
 432                         ri->channels[chan].ce_count = 0;
 433         }
 434
 435         mci->start_time = jiffies;
 436         return count;
 437 }
 438
 439 /* memory scrubbing */
 440 static ssize_t mci_sdram_scrub_rate_store(struct mem_ctl_info *mci,
 441                                         const char *data, size_t count)
 442 {
 443         u32 bandwidth = -1;
 444
 445         if (mci->set_sdram_scrub_rate) {
 446
 447                 memctrl_int_store(&bandwidth, data, count);
 448
 449                 if (!(*mci->set_sdram_scrub_rate) (mci, &bandwidth)) {
 450                         edac_printk(KERN_DEBUG, EDAC_MC,
 451                                 "Scrub rate set successfully, applied: %d\n",
 452                                 bandwidth);
 453                 } else {
 454                         /* FIXME: error codes maybe? */
 455                         edac_printk(KERN_DEBUG, EDAC_MC,
 456                                 "Scrub rate set FAILED, could not apply: %d\n",
 457                                 bandwidth);
 458                 }
 459         } else {
 460                 /* FIXME: produce "not implemented" ERROR for user-side. */
 461                 edac_printk(KERN_WARNING, EDAC_MC,
 462                         "Memory scrubbing 'set'control is not implemented!\n");
 463         }
 464         return count;
 465 }
 466
 467 static ssize_t mci_sdram_scrub_rate_show(struct mem_ctl_info *mci, char *data)
 468 {
 469         u32 bandwidth = -1;
 470
 471         if (mci->get_sdram_scrub_rate) {
 472                 if (!(*mci->get_sdram_scrub_rate) (mci, &bandwidth)) {
 473                         edac_printk(KERN_DEBUG, EDAC_MC,
 474                                 "Scrub rate successfully, fetched: %d\n",
 475                                 bandwidth);
 476                 } else {
 477                         /* FIXME: error codes maybe? */
 478                         edac_printk(KERN_DEBUG, EDAC_MC,
 479                                 "Scrub rate fetch FAILED, got: %d\n",
 480                                 bandwidth);
 481                 }
 482         } else {
 483                 /* FIXME: produce "not implemented" ERROR for user-side.  */
 484                 edac_printk(KERN_WARNING, EDAC_MC,
 485                         "Memory scrubbing 'get' control is not implemented\n");
 486         }
 487         return sprintf(data, "%d\n", bandwidth);
 488 }
 489
 490 /* default attribute files for the MCI object */
 491 static ssize_t mci_ue_count_show(struct mem_ctl_info *mci, char *data)
 492 {
 493         return sprintf(data, "%d\n", mci->ue_count);
 494 }
 495
 496 static ssize_t mci_ce_count_show(struct mem_ctl_info *mci, char *data)
 497 {
 498         return sprintf(data, "%d\n", mci->ce_count);
 499 }
 500
 501 static ssize_t mci_ce_noinfo_show(struct mem_ctl_info *mci, char *data)
 502 {
 503         return sprintf(data, "%d\n", mci->ce_noinfo_count);
 504 }
 505
 506 static ssize_t mci_ue_noinfo_show(struct mem_ctl_info *mci, char *data)
 507 {
 508         return sprintf(data, "%d\n", mci->ue_noinfo_count);
 509 }
 510
 511 static ssize_t mci_seconds_show(struct mem_ctl_info *mci, char *data)
 512 {
 513         return sprintf(data, "%ld\n", (jiffies - mci->start_time) / HZ);
 514 }
 515
 516 static ssize_t mci_ctl_name_show(struct mem_ctl_info *mci, char *data)
 517 {
 518         return sprintf(data, "%s\n", mci->ctl_name);
 519 }
 520
 521 static ssize_t mci_size_mb_show(struct mem_ctl_info *mci, char *data)
 522 {
 523         int total_pages, csrow_idx;
 524
 525         for (total_pages = csrow_idx = 0; csrow_idx < mci->nr_csrows;
 526                 csrow_idx++) {
 527                 struct csrow_info *csrow = &mci->csrows[csrow_idx];
 528
 529                 if (!csrow->nr_pages)
 530                         continue;
 531
 532                 total_pages += csrow->nr_pages;
 533         }
 534
 535         return sprintf(data, "%u\n", PAGES_TO_MiB(total_pages));
 536 }
 537
 538 #define to_mci(k) container_of(k, struct mem_ctl_info, edac_mci_kobj)
 539 #define to_mcidev_attr(a) container_of(a,struct mcidev_sysfs_attribute,attr)
 540
 541 /* MCI show/store functions for top most object */
 542 static ssize_t mcidev_show(struct kobject *kobj, struct attribute *attr,
 543                         char *buffer)
 544 {
 545         struct mem_ctl_info *mem_ctl_info = to_mci(kobj);
 546         struct mcidev_sysfs_attribute *mcidev_attr = to_mcidev_attr(attr);
 547
 548         if (mcidev_attr->show)
 549                 return mcidev_attr->show(mem_ctl_info, buffer);
 550
 551         return -EIO;
 552 }
 553
 554 static ssize_t mcidev_store(struct kobject *kobj, struct attribute *attr,
 555                         const char *buffer, size_t count)
 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->store)
 561                 return mcidev_attr->store(mem_ctl_info, buffer, count);
 562
 563         return -EIO;
 564 }
 565
 566 /* Intermediate show/store table */
 567 static struct sysfs_ops mci_ops = {
 568         .show = mcidev_show,
 569         .store = mcidev_store
 570 };
 571
 572 #define MCIDEV_ATTR(_name,_mode,_show,_store)                   \
 573 static struct mcidev_sysfs_attribute mci_attr_##_name = {                       \
 574         .attr = {.name = __stringify(_name), .mode = _mode },   \
 575         .show   = _show,                                        \
 576         .store  = _store,                                       \
 577 };
 578
 579 /* default Control file */
 580 MCIDEV_ATTR(reset_counters, S_IWUSR, NULL, mci_reset_counters_store);
 581
 582 /* default Attribute files */
 583 MCIDEV_ATTR(mc_name, S_IRUGO, mci_ctl_name_show, NULL);
 584 MCIDEV_ATTR(size_mb, S_IRUGO, mci_size_mb_show, NULL);
 585 MCIDEV_ATTR(seconds_since_reset, S_IRUGO, mci_seconds_show, NULL);
 586 MCIDEV_ATTR(ue_noinfo_count, S_IRUGO, mci_ue_noinfo_show, NULL);
 587 MCIDEV_ATTR(ce_noinfo_count, S_IRUGO, mci_ce_noinfo_show, NULL);
 588 MCIDEV_ATTR(ue_count, S_IRUGO, mci_ue_count_show, NULL);
 589 MCIDEV_ATTR(ce_count, S_IRUGO, mci_ce_count_show, NULL);
 590
 591 /* memory scrubber attribute file */
 592 MCIDEV_ATTR(sdram_scrub_rate, S_IRUGO | S_IWUSR, mci_sdram_scrub_rate_show,
 593         mci_sdram_scrub_rate_store);
 594
 595 static struct mcidev_sysfs_attribute *mci_attr[] = {
 596         &mci_attr_reset_counters,
 597         &mci_attr_mc_name,
 598         &mci_attr_size_mb,
 599         &mci_attr_seconds_since_reset,
 600         &mci_attr_ue_noinfo_count,
 601         &mci_attr_ce_noinfo_count,
 602         &mci_attr_ue_count,
 603         &mci_attr_ce_count,
 604         &mci_attr_sdram_scrub_rate,
 605         NULL
 606 };
 607
 608
 609 /*
 610  * Release of a MC controlling instance
 611  *
 612  *      each MC control instance has the following resources upon entry:
 613  *              a) a ref count on the top memctl kobj
 614  *              b) a ref count on this module
 615  *
 616  *      this function must decrement those ref counts and then
 617  *      issue a free on the instance's memory
 618  */
 619 static void edac_mci_control_release(struct kobject *kobj)
 620 {
 621         struct mem_ctl_info *mci;
 622
 623         mci = to_mci(kobj);
 624
 625         debugf0("%s() mci instance idx=%d releasing\n", __func__, mci->mc_idx);
 626
 627         /* decrement the module ref count */
 628         module_put(mci->owner);
 629
 630         /* free the mci instance memory here */
 631         kfree(mci);
 632 }
 633
 634 static struct kobj_type ktype_mci = {
 635         .release = edac_mci_control_release,
 636         .sysfs_ops = &mci_ops,
 637         .default_attrs = (struct attribute **)mci_attr,
 638 };
 639
 640 /* show/store, tables, etc for the MC kset */
 641
 642
 643 struct memctrl_dev_attribute {
 644         struct attribute attr;
 645         void *value;
 646          ssize_t(*show) (void *, char *);
 647          ssize_t(*store) (void *, const char *, size_t);
 648 };
 649
 650 /* Set of show/store abstract level functions for memory control object */
 651 static ssize_t memctrl_dev_show(struct kobject *kobj,
 652                                 struct attribute *attr, char *buffer)
 653 {
 654         struct memctrl_dev_attribute *memctrl_dev;
 655         memctrl_dev = (struct memctrl_dev_attribute *)attr;
 656
 657         if (memctrl_dev->show)
 658                 return memctrl_dev->show(memctrl_dev->value, buffer);
 659
 660         return -EIO;
 661 }
 662
 663 static ssize_t memctrl_dev_store(struct kobject *kobj, struct attribute *attr,
 664                                  const char *buffer, size_t count)
 665 {
 666         struct memctrl_dev_attribute *memctrl_dev;
 667         memctrl_dev = (struct memctrl_dev_attribute *)attr;
 668
 669         if (memctrl_dev->store)
 670                 return memctrl_dev->store(memctrl_dev->value, buffer, count);
 671
 672         return -EIO;
 673 }
 674
 675 static struct sysfs_ops memctrlfs_ops = {
 676         .show = memctrl_dev_show,
 677         .store = memctrl_dev_store
 678 };
 679
 680 #define MEMCTRL_ATTR(_name, _mode, _show, _store)                       \
 681 static struct memctrl_dev_attribute attr_##_name = {                    \
 682         .attr = {.name = __stringify(_name), .mode = _mode },   \
 683         .value  = &_name,                                       \
 684         .show   = _show,                                        \
 685         .store  = _store,                                       \
 686 };
 687
 688 #define MEMCTRL_STRING_ATTR(_name, _data, _mode, _show, _store) \
 689 static struct memctrl_dev_attribute attr_##_name = {                    \
 690         .attr = {.name = __stringify(_name), .mode = _mode },   \
 691         .value  = _data,                                        \
 692         .show   = _show,                                        \
 693         .store  = _store,                                       \
 694 };
 695
 696 /* csrow<id> control files */
 697 MEMCTRL_ATTR(edac_mc_panic_on_ue,
 698         S_IRUGO | S_IWUSR, memctrl_int_show, memctrl_int_store);
 699
 700 MEMCTRL_ATTR(edac_mc_log_ue,
 701         S_IRUGO | S_IWUSR, memctrl_int_show, memctrl_int_store);
 702
 703 MEMCTRL_ATTR(edac_mc_log_ce,
 704         S_IRUGO | S_IWUSR, memctrl_int_show, memctrl_int_store);
 705
 706 MEMCTRL_ATTR(edac_mc_poll_msec,
 707         S_IRUGO | S_IWUSR, memctrl_int_show, memctrl_int_store);
 708
 709 /* Base Attributes of the memory ECC object */
 710 static struct memctrl_dev_attribute *memctrl_attr[] = {
 711         &attr_edac_mc_panic_on_ue,
 712         &attr_edac_mc_log_ue,
 713         &attr_edac_mc_log_ce,
 714         &attr_edac_mc_poll_msec,
 715         NULL,
 716 };
 717
 718
 719 /* the ktype for the mc_kset internal kobj */
 720 static struct kobj_type ktype_mc_set_attribs = {
 721         .sysfs_ops = &memctrlfs_ops,
 722         .default_attrs = (struct attribute **)memctrl_attr,
 723 };
 724
 725 /* EDAC memory controller sysfs kset:
 726  *      /sys/devices/system/edac/mc
 727  */
 728 static struct kset mc_kset = {
 729         .kobj = {.name = "mc", .ktype = &ktype_mc_set_attribs },
 730         .ktype = &ktype_mci,
 731 };
 732
 733
 734 /*
 735  * edac_mc_register_sysfs_main_kobj
 736  *
 737  *      setups and registers the main kobject for each mci
 738  */
 739 int edac_mc_register_sysfs_main_kobj(struct mem_ctl_info *mci)
 740 {
 741         struct kobject *kobj_mci;
 742         int err;
 743
 744         debugf1("%s()\n", __func__);
 745
 746         kobj_mci = &mci->edac_mci_kobj;
 747
 748         /* Init the mci's kobject */
 749         memset(kobj_mci, 0, sizeof(*kobj_mci));
 750
 751         /* this instance become part of the mc_kset */
 752         kobj_mci->kset = &mc_kset;
 753
 754         /* set the name of the mc<id> object */
 755         err = kobject_set_name(kobj_mci, "mc%d", mci->mc_idx);
 756         if (err)
 757                 goto fail_out;
 758
 759         /* Record which module 'owns' this control structure
 760          * and bump the ref count of the module
 761          */
 762         mci->owner = THIS_MODULE;
 763
 764         /* bump ref count on this module */
 765         if (!try_module_get(mci->owner)) {
 766                 err = -ENODEV;
 767                 goto fail_out;
 768         }
 769
 770         /* register the mc<id> kobject to the mc_kset */
 771         err = kobject_register(kobj_mci);
 772         if (err) {
 773                 debugf1("%s()Failed to register '.../edac/mc%d'\n",
 774                         __func__, mci->mc_idx);
 775                 goto kobj_reg_fail;
 776         }
 777
 778         /* At this point, to 'free' the control struct,
 779          * edac_mc_unregister_sysfs_main_kobj() must be used
 780          */
 781
 782         debugf1("%s() Registered '.../edac/mc%d' kobject\n",
 783                 __func__, mci->mc_idx);
 784
 785         return 0;
 786
 787         /* Error exit stack */
 788
 789 kobj_reg_fail:
 790         module_put(mci->owner);
 791
 792 fail_out:
 793         return err;
 794 }
 795
 796 /*
 797  * edac_mc_register_sysfs_main_kobj
 798  *
 799  *      tears down and the main mci kobject from the mc_kset
 800  */
 801 void edac_mc_unregister_sysfs_main_kobj(struct mem_ctl_info *mci)
 802 {
 803         /* delete the kobj from the mc_kset */
 804         kobject_unregister(&mci->edac_mci_kobj);
 805 }
 806
 807 #define EDAC_DEVICE_SYMLINK     "device"
 808
 809 /*
 810  * edac_create_mci_instance_attributes
 811  *      create MC driver specific attributes at the topmost level
 812  *      directory of this mci instance.
 813  */
 814 static int edac_create_mci_instance_attributes(struct mem_ctl_info *mci)
 815 {
 816         int err;
 817         struct mcidev_sysfs_attribute *sysfs_attrib;
 818
 819         /* point to the start of the array and iterate over it
 820          * adding each attribute listed to this mci instance's kobject
 821          */
 822         sysfs_attrib = mci->mc_driver_sysfs_attributes;
 823
 824         while (sysfs_attrib && sysfs_attrib->attr.name) {
 825                 err = sysfs_create_file(&mci->edac_mci_kobj,
 826                                         (struct attribute*) sysfs_attrib);
 827                 if (err) {
 828                         return err;
 829                 }
 830
 831                 sysfs_attrib++;
 832         }
 833
 834         return 0;
 835 }
 836
 837 /*
 838  * edac_remove_mci_instance_attributes
 839  *      remove MC driver specific attributes at the topmost level
 840  *      directory of this mci instance.
 841  */
 842 static void edac_remove_mci_instance_attributes(struct mem_ctl_info *mci)
 843 {
 844         struct mcidev_sysfs_attribute *sysfs_attrib;
 845
 846         /* point to the start of the array and iterate over it
 847          * adding each attribute listed to this mci instance's kobject
 848          */
 849         sysfs_attrib = mci->mc_driver_sysfs_attributes;
 850
 851         /* loop if there are attributes and until we hit a NULL entry */
 852         while (sysfs_attrib && sysfs_attrib->attr.name) {
 853                 sysfs_remove_file(&mci->edac_mci_kobj,
 854                                         (struct attribute *) sysfs_attrib);
 855                 sysfs_attrib++;
 856         }
 857 }
 858
 859
 860 /*
 861  * Create a new Memory Controller kobject instance,
 862  *      mc<id> under the 'mc' directory
 863  *
 864  * Return:
 865  *      0       Success
 866  *      !0      Failure
 867  */
 868 int edac_create_sysfs_mci_device(struct mem_ctl_info *mci)
 869 {
 870         int i;
 871         int err;
 872         struct csrow_info *csrow;
 873         struct kobject *kobj_mci = &mci->edac_mci_kobj;
 874
 875         debugf0("%s() idx=%d\n", __func__, mci->mc_idx);
 876
 877         /* create a symlink for the device */
 878         err = sysfs_create_link(kobj_mci, &mci->dev->kobj,
 879                                 EDAC_DEVICE_SYMLINK);
 880         if (err) {
 881                 debugf1("%s() failure to create symlink\n", __func__);
 882                 goto fail0;
 883         }
 884
 885         /* If the low level driver desires some attributes,
 886          * then create them now for the driver.
 887          */
 888         if (mci->mc_driver_sysfs_attributes) {
 889                 err = edac_create_mci_instance_attributes(mci);
 890                 if (err) {
 891                         debugf1("%s() failure to create mci attributes\n",
 892                                 __func__);
 893                         goto fail0;
 894                 }
 895         }
 896
 897         /* Make directories for each CSROW object under the mc<id> kobject
 898          */
 899         for (i = 0; i < mci->nr_csrows; i++) {
 900                 csrow = &mci->csrows[i];
 901
 902                 /* Only expose populated CSROWs */
 903                 if (csrow->nr_pages > 0) {
 904                         err = edac_create_csrow_object(mci, csrow, i);
 905                         if (err) {
 906                                 debugf1("%s() failure: create csrow %d obj\n",
 907                                         __func__, i);
 908                                 goto fail1;
 909                         }
 910                 }
 911         }
 912
 913         return 0;
 914
 915         /* CSROW error: backout what has already been registered,  */
 916 fail1:
 917         for (i--; i >= 0; i--) {
 918                 if (csrow->nr_pages > 0) {
 919                         kobject_unregister(&mci->csrows[i].kobj);
 920                 }
 921         }
 922
 923         /* remove the mci instance's attributes, if any */
 924         edac_remove_mci_instance_attributes(mci);
 925
 926         /* remove the symlink */
 927         sysfs_remove_link(kobj_mci, EDAC_DEVICE_SYMLINK);
 928
 929 fail0:
 930         return err;
 931 }
 932
 933 /*
 934  * remove a Memory Controller instance
 935  */
 936 void edac_remove_sysfs_mci_device(struct mem_ctl_info *mci)
 937 {
 938         int i;
 939
 940         debugf0("%s()\n", __func__);
 941
 942         /* remove all csrow kobjects */
 943         for (i = 0; i < mci->nr_csrows; i++) {
 944                 if (mci->csrows[i].nr_pages > 0) {
 945                         debugf0("%s()  unreg csrow-%d\n", __func__, i);
 946                         kobject_unregister(&mci->csrows[i].kobj);
 947                 }
 948         }
 949
 950         debugf0("%s()  remove_link\n", __func__);
 951
 952         /* remove the symlink */
 953         sysfs_remove_link(&mci->edac_mci_kobj, EDAC_DEVICE_SYMLINK);
 954
 955         debugf0("%s()  remove_mci_instance\n", __func__);
 956
 957         /* remove this mci instance's attribtes */
 958         edac_remove_mci_instance_attributes(mci);
 959
 960         debugf0("%s()  unregister this mci kobj\n", __func__);
 961
 962         /* unregister this instance's kobject */
 963         kobject_unregister(&mci->edac_mci_kobj);
 964 }
 965
 966
 967
 968
 969 /*
 970  * edac_setup_sysfs_mc_kset(void)
 971  *
 972  * Initialize the mc_kset for the 'mc' entry
 973  *      This requires creating the top 'mc' directory with a kset
 974  *      and its controls/attributes.
 975  *
 976  *      To this 'mc' kset, instance 'mci' will be grouped as children.
 977  *
 978  * Return:  0 SUCCESS
 979  *         !0 FAILURE error code
 980  */
 981 int edac_sysfs_setup_mc_kset(void)
 982 {
 983         int err = 0;
 984         struct sysdev_class *edac_class;
 985
 986         debugf1("%s()\n", __func__);
 987
 988         /* get the /sys/devices/system/edac class reference */
 989         edac_class = edac_get_edac_class();
 990         if (edac_class == NULL) {
 991                 debugf1("%s() no edac_class error=%d\n", __func__, err);
 992                 goto fail_out;
 993         }
 994
 995         /* Init the MC's kobject */
 996         mc_kset.kobj.parent = &edac_class->kset.kobj;
 997
 998         /* register the mc_kset */
 999         err = kset_register(&mc_kset);
1000         if (err) {
1001                 debugf1("%s() Failed to register '.../edac/mc'\n", __func__);
1002                 goto fail_out;
1003         }
1004
1005         debugf1("%s() Registered '.../edac/mc' kobject\n", __func__);
1006
1007         return 0;
1008
1009
1010         /* error unwind stack */
1011 fail_out:
1012         return err;
1013 }
1014
1015 /*
1016  * edac_sysfs_teardown_mc_kset
1017  *
1018  *      deconstruct the mc_ket for memory controllers
1019  */
1020 void edac_sysfs_teardown_mc_kset(void)
1021 {
1022         kset_unregister(&mc_kset);
1023 }
1024