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   1 /*
   2  * edac_mc kernel module
   3  * (C) 2005, 2006 Linux Networx (http://lnxi.com)
   4  * This file may be distributed under the terms of the
   5  * GNU General Public License.
   6  *
   7  * Written Doug Thompson <norsk5@xmission.com>
   8  *
   9  */
  10
  11 #include <linux/module.h>
  12 #include <linux/sysdev.h>
  13 #include <linux/ctype.h>
  14
  15 #include "edac_mc.h"
  16 #include "edac_module.h"
  17
  18 /* MC EDAC Controls, setable by module parameter, and sysfs */
  19 static int log_ue = 1;
  20 static int log_ce = 1;
  21 static int panic_on_ue;
  22 static int poll_msec = 1000;
  23
  24 /* Getter functions for above */
  25 int edac_get_log_ue()
  26 {
  27         return log_ue;
  28 }
  29
  30 int edac_get_log_ce()
  31 {
  32         return log_ce;
  33 }
  34
  35 int edac_get_panic_on_ue()
  36 {
  37         return panic_on_ue;
  38 }
  39
  40 int edac_get_poll_msec()
  41 {
  42         return poll_msec;
  43 }
  44
  45 /* Parameter declarations for above */
  46 module_param(panic_on_ue, int, 0644);
  47 MODULE_PARM_DESC(panic_on_ue, "Panic on uncorrected error: 0=off 1=on");
  48 module_param(log_ue, int, 0644);
  49 MODULE_PARM_DESC(log_ue, "Log uncorrectable error to console: 0=off 1=on");
  50 module_param(log_ce, int, 0644);
  51 MODULE_PARM_DESC(log_ce, "Log correctable error to console: 0=off 1=on");
  52 module_param(poll_msec, int, 0644);
  53 MODULE_PARM_DESC(poll_msec, "Polling period in milliseconds");
  54
  55
  56 /*
  57  * various constants for Memory Controllers
  58  */
  59 static const char *mem_types[] = {
  60         [MEM_EMPTY] = "Empty",
  61         [MEM_RESERVED] = "Reserved",
  62         [MEM_UNKNOWN] = "Unknown",
  63         [MEM_FPM] = "FPM",
  64         [MEM_EDO] = "EDO",
  65         [MEM_BEDO] = "BEDO",
  66         [MEM_SDR] = "Unbuffered-SDR",
  67         [MEM_RDR] = "Registered-SDR",
  68         [MEM_DDR] = "Unbuffered-DDR",
  69         [MEM_RDDR] = "Registered-DDR",
  70         [MEM_RMBS] = "RMBS",
  71         [MEM_DDR2] = "Unbuffered-DDR2",
  72         [MEM_FB_DDR2] = "FullyBuffered-DDR2",
  73         [MEM_RDDR2] = "Registered-DDR2"
  74 };
  75
  76 static const char *dev_types[] = {
  77         [DEV_UNKNOWN] = "Unknown",
  78         [DEV_X1] = "x1",
  79         [DEV_X2] = "x2",
  80         [DEV_X4] = "x4",
  81         [DEV_X8] = "x8",
  82         [DEV_X16] = "x16",
  83         [DEV_X32] = "x32",
  84         [DEV_X64] = "x64"
  85 };
  86
  87 static const char *edac_caps[] = {
  88         [EDAC_UNKNOWN] = "Unknown",
  89         [EDAC_NONE] = "None",
  90         [EDAC_RESERVED] = "Reserved",
  91         [EDAC_PARITY] = "PARITY",
  92         [EDAC_EC] = "EC",
  93         [EDAC_SECDED] = "SECDED",
  94         [EDAC_S2ECD2ED] = "S2ECD2ED",
  95         [EDAC_S4ECD4ED] = "S4ECD4ED",
  96         [EDAC_S8ECD8ED] = "S8ECD8ED",
  97         [EDAC_S16ECD16ED] = "S16ECD16ED"
  98 };
  99
 100 /* sysfs object:
 101  *      /sys/devices/system/edac/mc
 102  */
 103 static struct kobject edac_memctrl_kobj;
 104
 105 /* We use these to wait for the reference counts on edac_memctrl_kobj and
 106  * edac_pci_kobj to reach 0.
 107  */
 108 static struct completion edac_memctrl_kobj_complete;
 109
 110 /*
 111  * /sys/devices/system/edac/mc;
 112  *      data structures and methods
 113  */
 114 static ssize_t memctrl_int_show(void *ptr, char *buffer)
 115 {
 116         int *value = (int*) ptr;
 117         return sprintf(buffer, "%u\n", *value);
 118 }
 119
 120 static ssize_t memctrl_int_store(void *ptr, const char *buffer, size_t count)
 121 {
 122         int *value = (int*) ptr;
 123
 124         if (isdigit(*buffer))
 125                 *value = simple_strtoul(buffer, NULL, 0);
 126
 127         return count;
 128 }
 129
 130 struct memctrl_dev_attribute {
 131         struct attribute attr;
 132         void *value;
 133         ssize_t (*show)(void *,char *);
 134         ssize_t (*store)(void *, const char *, size_t);
 135 };
 136
 137 /* Set of show/store abstract level functions for memory control object */
 138 static ssize_t memctrl_dev_show(struct kobject *kobj,
 139                 struct attribute *attr, char *buffer)
 140 {
 141         struct memctrl_dev_attribute *memctrl_dev;
 142         memctrl_dev = (struct memctrl_dev_attribute*)attr;
 143
 144         if (memctrl_dev->show)
 145                 return memctrl_dev->show(memctrl_dev->value, buffer);
 146
 147         return -EIO;
 148 }
 149
 150 static ssize_t memctrl_dev_store(struct kobject *kobj, struct attribute *attr,
 151                 const char *buffer, size_t count)
 152 {
 153         struct memctrl_dev_attribute *memctrl_dev;
 154         memctrl_dev = (struct memctrl_dev_attribute*)attr;
 155
 156         if (memctrl_dev->store)
 157                 return memctrl_dev->store(memctrl_dev->value, buffer, count);
 158
 159         return -EIO;
 160 }
 161
 162 static struct sysfs_ops memctrlfs_ops = {
 163         .show   = memctrl_dev_show,
 164         .store  = memctrl_dev_store
 165 };
 166
 167 #define MEMCTRL_ATTR(_name,_mode,_show,_store)                  \
 168 static struct memctrl_dev_attribute attr_##_name = {                    \
 169         .attr = {.name = __stringify(_name), .mode = _mode },   \
 170         .value  = &_name,                                       \
 171         .show   = _show,                                        \
 172         .store  = _store,                                       \
 173 };
 174
 175 #define MEMCTRL_STRING_ATTR(_name,_data,_mode,_show,_store)     \
 176 static struct memctrl_dev_attribute attr_##_name = {                    \
 177         .attr = {.name = __stringify(_name), .mode = _mode },   \
 178         .value  = _data,                                        \
 179         .show   = _show,                                        \
 180         .store  = _store,                                       \
 181 };
 182
 183 /* csrow<id> control files */
 184 MEMCTRL_ATTR(panic_on_ue,S_IRUGO|S_IWUSR,memctrl_int_show,memctrl_int_store);
 185 MEMCTRL_ATTR(log_ue,S_IRUGO|S_IWUSR,memctrl_int_show,memctrl_int_store);
 186 MEMCTRL_ATTR(log_ce,S_IRUGO|S_IWUSR,memctrl_int_show,memctrl_int_store);
 187 MEMCTRL_ATTR(poll_msec,S_IRUGO|S_IWUSR,memctrl_int_show,memctrl_int_store);
 188
 189 /* Base Attributes of the memory ECC object */
 190 static struct memctrl_dev_attribute *memctrl_attr[] = {
 191         &attr_panic_on_ue,
 192         &attr_log_ue,
 193         &attr_log_ce,
 194         &attr_poll_msec,
 195         NULL,
 196 };
 197
 198 /* Main MC kobject release() function */
 199 static void edac_memctrl_master_release(struct kobject *kobj)
 200 {
 201         debugf1("%s()\n", __func__);
 202         complete(&edac_memctrl_kobj_complete);
 203 }
 204
 205 static struct kobj_type ktype_memctrl = {
 206         .release = edac_memctrl_master_release,
 207         .sysfs_ops = &memctrlfs_ops,
 208         .default_attrs = (struct attribute **) memctrl_attr,
 209 };
 210
 211 /* Initialize the main sysfs entries for edac:
 212  *   /sys/devices/system/edac
 213  *
 214  * and children
 215  *
 216  * Return:  0 SUCCESS
 217  *         !0 FAILURE
 218  */
 219 int edac_sysfs_memctrl_setup(void)
 220 {
 221         int err = 0;
 222         struct sysdev_class *edac_class;
 223
 224         debugf1("%s()\n", __func__);
 225
 226         /* get the /sys/devices/system/edac class reference */
 227         edac_class = edac_get_edac_class();
 228         if (edac_class == NULL) {
 229                 debugf1("%s() no edac_class error=%d\n", __func__, err);
 230                 return err;
 231         }
 232
 233         /* Init the MC's kobject */
 234         memset(&edac_memctrl_kobj, 0, sizeof (edac_memctrl_kobj));
 235         edac_memctrl_kobj.parent = &edac_class->kset.kobj;
 236         edac_memctrl_kobj.ktype = &ktype_memctrl;
 237
 238         /* generate sysfs "..../edac/mc"   */
 239         err = kobject_set_name(&edac_memctrl_kobj,"mc");
 240         if (err) {
 241                 debugf1("%s() Failed to set name '.../edac/mc'\n", __func__ );
 242                 return err;
 243         }
 244
 245         /* FIXME: maybe new sysdev_create_subdir() */
 246         err = kobject_register(&edac_memctrl_kobj);
 247         if (err) {
 248                 debugf1("%s() Failed to register '.../edac/mc'\n", __func__ );
 249                 return err;
 250         }
 251
 252         debugf1("%s() Registered '.../edac/mc' kobject\n",__func__);
 253         return 0;
 254 }
 255
 256 /*
 257  * MC teardown:
 258  *      the '..../edac/mc' kobject followed by '..../edac' itself
 259  */
 260 void edac_sysfs_memctrl_teardown(void)
 261 {
 262         debugf0("MC: " __FILE__ ": %s()\n", __func__);
 263
 264         /* Unregister the MC's kobject and wait for reference count to reach 0.
 265          */
 266         init_completion(&edac_memctrl_kobj_complete);
 267         kobject_unregister(&edac_memctrl_kobj);
 268         wait_for_completion(&edac_memctrl_kobj_complete);
 269 }
 270
 271
 272 /* EDAC sysfs CSROW data structures and methods
 273  */
 274
 275 /* Set of more default csrow<id> attribute show/store functions */
 276 static ssize_t csrow_ue_count_show(struct csrow_info *csrow, char *data,
 277                         int private)
 278 {
 279         return sprintf(data,"%u\n", csrow->ue_count);
 280 }
 281
 282 static ssize_t csrow_ce_count_show(struct csrow_info *csrow, char *data,
 283                         int private)
 284 {
 285         return sprintf(data,"%u\n", csrow->ce_count);
 286 }
 287
 288 static ssize_t csrow_size_show(struct csrow_info *csrow, char *data,
 289                         int private)
 290 {
 291         return sprintf(data,"%u\n", PAGES_TO_MiB(csrow->nr_pages));
 292 }
 293
 294 static ssize_t csrow_mem_type_show(struct csrow_info *csrow, char *data,
 295                         int private)
 296 {
 297         return sprintf(data,"%s\n", mem_types[csrow->mtype]);
 298 }
 299
 300 static ssize_t csrow_dev_type_show(struct csrow_info *csrow, char *data,
 301                         int private)
 302 {
 303         return sprintf(data,"%s\n", dev_types[csrow->dtype]);
 304 }
 305
 306 static ssize_t csrow_edac_mode_show(struct csrow_info *csrow, char *data,
 307                         int private)
 308 {
 309         return sprintf(data,"%s\n", edac_caps[csrow->edac_mode]);
 310 }
 311
 312 /* show/store functions for DIMM Label attributes */
 313 static ssize_t channel_dimm_label_show(struct csrow_info *csrow,
 314                 char *data, int channel)
 315 {
 316         return snprintf(data, EDAC_MC_LABEL_LEN,"%s",
 317                         csrow->channels[channel].label);
 318 }
 319
 320 static ssize_t channel_dimm_label_store(struct csrow_info *csrow,
 321                                 const char *data,
 322                                 size_t count,
 323                                 int channel)
 324 {
 325         ssize_t max_size = 0;
 326
 327         max_size = min((ssize_t)count,(ssize_t)EDAC_MC_LABEL_LEN-1);
 328         strncpy(csrow->channels[channel].label, data, max_size);
 329         csrow->channels[channel].label[max_size] = '\0';
 330
 331         return max_size;
 332 }
 333
 334 /* show function for dynamic chX_ce_count attribute */
 335 static ssize_t channel_ce_count_show(struct csrow_info *csrow,
 336                                 char *data,
 337                                 int channel)
 338 {
 339         return sprintf(data, "%u\n", csrow->channels[channel].ce_count);
 340 }
 341
 342 /* csrow specific attribute structure */
 343 struct csrowdev_attribute {
 344         struct attribute attr;
 345         ssize_t (*show)(struct csrow_info *,char *,int);
 346         ssize_t (*store)(struct csrow_info *, const char *,size_t,int);
 347         int    private;
 348 };
 349
 350 #define to_csrow(k) container_of(k, struct csrow_info, kobj)
 351 #define to_csrowdev_attr(a) container_of(a, struct csrowdev_attribute, attr)
 352
 353 /* Set of show/store higher level functions for default csrow attributes */
 354 static ssize_t csrowdev_show(struct kobject *kobj,
 355                         struct attribute *attr,
 356                         char *buffer)
 357 {
 358         struct csrow_info *csrow = to_csrow(kobj);
 359         struct csrowdev_attribute *csrowdev_attr = to_csrowdev_attr(attr);
 360
 361         if (csrowdev_attr->show)
 362                 return csrowdev_attr->show(csrow,
 363                                         buffer,
 364                                         csrowdev_attr->private);
 365         return -EIO;
 366 }
 367
 368 static ssize_t csrowdev_store(struct kobject *kobj, struct attribute *attr,
 369                 const char *buffer, size_t count)
 370 {
 371         struct csrow_info *csrow = to_csrow(kobj);
 372         struct csrowdev_attribute * csrowdev_attr = to_csrowdev_attr(attr);
 373
 374         if (csrowdev_attr->store)
 375                 return csrowdev_attr->store(csrow,
 376                                         buffer,
 377                                         count,
 378                                         csrowdev_attr->private);
 379         return -EIO;
 380 }
 381
 382 static struct sysfs_ops csrowfs_ops = {
 383         .show   = csrowdev_show,
 384         .store  = csrowdev_store
 385 };
 386
 387 #define CSROWDEV_ATTR(_name,_mode,_show,_store,_private)        \
 388 static struct csrowdev_attribute attr_##_name = {                       \
 389         .attr = {.name = __stringify(_name), .mode = _mode },   \
 390         .show   = _show,                                        \
 391         .store  = _store,                                       \
 392         .private = _private,                                    \
 393 };
 394
 395 /* default cwrow<id>/attribute files */
 396 CSROWDEV_ATTR(size_mb,S_IRUGO,csrow_size_show,NULL,0);
 397 CSROWDEV_ATTR(dev_type,S_IRUGO,csrow_dev_type_show,NULL,0);
 398 CSROWDEV_ATTR(mem_type,S_IRUGO,csrow_mem_type_show,NULL,0);
 399 CSROWDEV_ATTR(edac_mode,S_IRUGO,csrow_edac_mode_show,NULL,0);
 400 CSROWDEV_ATTR(ue_count,S_IRUGO,csrow_ue_count_show,NULL,0);
 401 CSROWDEV_ATTR(ce_count,S_IRUGO,csrow_ce_count_show,NULL,0);
 402
 403 /* default attributes of the CSROW<id> object */
 404 static struct csrowdev_attribute *default_csrow_attr[] = {
 405         &attr_dev_type,
 406         &attr_mem_type,
 407         &attr_edac_mode,
 408         &attr_size_mb,
 409         &attr_ue_count,
 410         &attr_ce_count,
 411         NULL,
 412 };
 413
 414
 415 /* possible dynamic channel DIMM Label attribute files */
 416 CSROWDEV_ATTR(ch0_dimm_label,S_IRUGO|S_IWUSR,
 417                 channel_dimm_label_show,
 418                 channel_dimm_label_store,
 419                 0 );
 420 CSROWDEV_ATTR(ch1_dimm_label,S_IRUGO|S_IWUSR,
 421                 channel_dimm_label_show,
 422                 channel_dimm_label_store,
 423                 1 );
 424 CSROWDEV_ATTR(ch2_dimm_label,S_IRUGO|S_IWUSR,
 425                 channel_dimm_label_show,
 426                 channel_dimm_label_store,
 427                 2 );
 428 CSROWDEV_ATTR(ch3_dimm_label,S_IRUGO|S_IWUSR,
 429                 channel_dimm_label_show,
 430                 channel_dimm_label_store,
 431                 3 );
 432 CSROWDEV_ATTR(ch4_dimm_label,S_IRUGO|S_IWUSR,
 433                 channel_dimm_label_show,
 434                 channel_dimm_label_store,
 435                 4 );
 436 CSROWDEV_ATTR(ch5_dimm_label,S_IRUGO|S_IWUSR,
 437                 channel_dimm_label_show,
 438                 channel_dimm_label_store,
 439                 5 );
 440
 441 /* Total possible dynamic DIMM Label attribute file table */
 442 static struct csrowdev_attribute *dynamic_csrow_dimm_attr[] = {
 443                 &attr_ch0_dimm_label,
 444                 &attr_ch1_dimm_label,
 445                 &attr_ch2_dimm_label,
 446                 &attr_ch3_dimm_label,
 447                 &attr_ch4_dimm_label,
 448                 &attr_ch5_dimm_label
 449 };
 450
 451 /* possible dynamic channel ce_count attribute files */
 452 CSROWDEV_ATTR(ch0_ce_count,S_IRUGO|S_IWUSR,
 453                 channel_ce_count_show,
 454                 NULL,
 455                 0 );
 456 CSROWDEV_ATTR(ch1_ce_count,S_IRUGO|S_IWUSR,
 457                 channel_ce_count_show,
 458                 NULL,
 459                 1 );
 460 CSROWDEV_ATTR(ch2_ce_count,S_IRUGO|S_IWUSR,
 461                 channel_ce_count_show,
 462                 NULL,
 463                 2 );
 464 CSROWDEV_ATTR(ch3_ce_count,S_IRUGO|S_IWUSR,
 465                 channel_ce_count_show,
 466                 NULL,
 467                 3 );
 468 CSROWDEV_ATTR(ch4_ce_count,S_IRUGO|S_IWUSR,
 469                 channel_ce_count_show,
 470                 NULL,
 471                 4 );
 472 CSROWDEV_ATTR(ch5_ce_count,S_IRUGO|S_IWUSR,
 473                 channel_ce_count_show,
 474                 NULL,
 475                 5 );
 476
 477 /* Total possible dynamic ce_count attribute file table */
 478 static struct csrowdev_attribute *dynamic_csrow_ce_count_attr[] = {
 479                 &attr_ch0_ce_count,
 480                 &attr_ch1_ce_count,
 481                 &attr_ch2_ce_count,
 482                 &attr_ch3_ce_count,
 483                 &attr_ch4_ce_count,
 484                 &attr_ch5_ce_count
 485 };
 486
 487
 488 #define EDAC_NR_CHANNELS        6
 489
 490 /* Create dynamic CHANNEL files, indexed by 'chan',  under specifed CSROW */
 491 static int edac_create_channel_files(struct kobject *kobj, int chan)
 492 {
 493         int err=-ENODEV;
 494
 495         if (chan >= EDAC_NR_CHANNELS)
 496                 return err;
 497
 498         /* create the DIMM label attribute file */
 499         err = sysfs_create_file(kobj,
 500                         (struct attribute *) dynamic_csrow_dimm_attr[chan]);
 501
 502         if (!err) {
 503                 /* create the CE Count attribute file */
 504                 err = sysfs_create_file(kobj,
 505                         (struct attribute *)dynamic_csrow_ce_count_attr[chan]);
 506         } else {
 507                 debugf1("%s()  dimm labels and ce_count files created",
 508                         __func__);
 509         }
 510
 511         return err;
 512 }
 513
 514 /* No memory to release for this kobj */
 515 static void edac_csrow_instance_release(struct kobject *kobj)
 516 {
 517         struct csrow_info *cs;
 518
 519         cs = container_of(kobj, struct csrow_info, kobj);
 520         complete(&cs->kobj_complete);
 521 }
 522
 523 /* the kobj_type instance for a CSROW */
 524 static struct kobj_type ktype_csrow = {
 525         .release = edac_csrow_instance_release,
 526         .sysfs_ops = &csrowfs_ops,
 527         .default_attrs = (struct attribute **) default_csrow_attr,
 528 };
 529
 530 /* Create a CSROW object under specifed edac_mc_device */
 531 static int edac_create_csrow_object(
 532                 struct kobject *edac_mci_kobj,
 533                 struct csrow_info *csrow,
 534                 int index)
 535 {
 536         int err = 0;
 537         int chan;
 538
 539         memset(&csrow->kobj, 0, sizeof(csrow->kobj));
 540
 541         /* generate ..../edac/mc/mc<id>/csrow<index>   */
 542
 543         csrow->kobj.parent = edac_mci_kobj;
 544         csrow->kobj.ktype = &ktype_csrow;
 545
 546         /* name this instance of csrow<id> */
 547         err = kobject_set_name(&csrow->kobj,"csrow%d",index);
 548         if (err)
 549                 goto error_exit;
 550
 551         /* Instanstiate the csrow object */
 552         err = kobject_register(&csrow->kobj);
 553         if (!err) {
 554                 /* Create the dyanmic attribute files on this csrow,
 555                  * namely, the DIMM labels and the channel ce_count
 556                  */
 557                 for (chan = 0; chan < csrow->nr_channels; chan++) {
 558                         err = edac_create_channel_files(&csrow->kobj,chan);
 559                         if (err)
 560                                 break;
 561                 }
 562         }
 563
 564 error_exit:
 565         return err;
 566 }
 567
 568 /* default sysfs methods and data structures for the main MCI kobject */
 569
 570 static ssize_t mci_reset_counters_store(struct mem_ctl_info *mci,
 571                 const char *data, size_t count)
 572 {
 573         int row, chan;
 574
 575         mci->ue_noinfo_count = 0;
 576         mci->ce_noinfo_count = 0;
 577         mci->ue_count = 0;
 578         mci->ce_count = 0;
 579
 580         for (row = 0; row < mci->nr_csrows; row++) {
 581                 struct csrow_info *ri = &mci->csrows[row];
 582
 583                 ri->ue_count = 0;
 584                 ri->ce_count = 0;
 585
 586                 for (chan = 0; chan < ri->nr_channels; chan++)
 587                         ri->channels[chan].ce_count = 0;
 588         }
 589
 590         mci->start_time = jiffies;
 591         return count;
 592 }
 593
 594 /* memory scrubbing */
 595 static ssize_t mci_sdram_scrub_rate_store(struct mem_ctl_info *mci,
 596                                         const char *data, size_t count)
 597 {
 598         u32 bandwidth = -1;
 599
 600         if (mci->set_sdram_scrub_rate) {
 601
 602                 memctrl_int_store(&bandwidth, data, count);
 603
 604                 if (!(*mci->set_sdram_scrub_rate)(mci, &bandwidth)) {
 605                         edac_printk(KERN_DEBUG, EDAC_MC,
 606                                 "Scrub rate set successfully, applied: %d\n",
 607                                 bandwidth);
 608                 } else {
 609                         /* FIXME: error codes maybe? */
 610                         edac_printk(KERN_DEBUG, EDAC_MC,
 611                                 "Scrub rate set FAILED, could not apply: %d\n",
 612                                 bandwidth);
 613                 }
 614         } else {
 615                 /* FIXME: produce "not implemented" ERROR for user-side. */
 616                 edac_printk(KERN_WARNING, EDAC_MC,
 617                         "Memory scrubbing 'set'control is not implemented!\n");
 618         }
 619         return count;
 620 }
 621
 622 static ssize_t mci_sdram_scrub_rate_show(struct mem_ctl_info *mci, char *data)
 623 {
 624         u32 bandwidth = -1;
 625
 626         if (mci->get_sdram_scrub_rate) {
 627                 if (!(*mci->get_sdram_scrub_rate)(mci, &bandwidth)) {
 628                         edac_printk(KERN_DEBUG, EDAC_MC,
 629                                 "Scrub rate successfully, fetched: %d\n",
 630                                 bandwidth);
 631                 } else {
 632                         /* FIXME: error codes maybe? */
 633                         edac_printk(KERN_DEBUG, EDAC_MC,
 634                                 "Scrub rate fetch FAILED, got: %d\n",
 635                                 bandwidth);
 636                 }
 637         } else {
 638                 /* FIXME: produce "not implemented" ERROR for user-side.  */
 639                 edac_printk(KERN_WARNING, EDAC_MC,
 640                         "Memory scrubbing 'get' control is not implemented\n");
 641         }
 642         return sprintf(data, "%d\n", bandwidth);
 643 }
 644
 645 /* default attribute files for the MCI object */
 646 static ssize_t mci_ue_count_show(struct mem_ctl_info *mci, char *data)
 647 {
 648         return sprintf(data,"%d\n", mci->ue_count);
 649 }
 650
 651 static ssize_t mci_ce_count_show(struct mem_ctl_info *mci, char *data)
 652 {
 653         return sprintf(data,"%d\n", mci->ce_count);
 654 }
 655
 656 static ssize_t mci_ce_noinfo_show(struct mem_ctl_info *mci, char *data)
 657 {
 658         return sprintf(data,"%d\n", mci->ce_noinfo_count);
 659 }
 660
 661 static ssize_t mci_ue_noinfo_show(struct mem_ctl_info *mci, char *data)
 662 {
 663         return sprintf(data,"%d\n", mci->ue_noinfo_count);
 664 }
 665
 666 static ssize_t mci_seconds_show(struct mem_ctl_info *mci, char *data)
 667 {
 668         return sprintf(data,"%ld\n", (jiffies - mci->start_time) / HZ);
 669 }
 670
 671 static ssize_t mci_ctl_name_show(struct mem_ctl_info *mci, char *data)
 672 {
 673         return sprintf(data,"%s\n", mci->ctl_name);
 674 }
 675
 676 static ssize_t mci_size_mb_show(struct mem_ctl_info *mci, char *data)
 677 {
 678         int total_pages, csrow_idx;
 679
 680         for (total_pages = csrow_idx = 0; csrow_idx < mci->nr_csrows;
 681                         csrow_idx++) {
 682                 struct csrow_info *csrow = &mci->csrows[csrow_idx];
 683
 684                 if (!csrow->nr_pages)
 685                         continue;
 686
 687                 total_pages += csrow->nr_pages;
 688         }
 689
 690         return sprintf(data,"%u\n", PAGES_TO_MiB(total_pages));
 691 }
 692
 693 struct mcidev_attribute {
 694         struct attribute attr;
 695         ssize_t (*show)(struct mem_ctl_info *,char *);
 696         ssize_t (*store)(struct mem_ctl_info *, const char *,size_t);
 697 };
 698
 699 #define to_mci(k) container_of(k, struct mem_ctl_info, edac_mci_kobj)
 700 #define to_mcidev_attr(a) container_of(a, struct mcidev_attribute, attr)
 701
 702 /* MCI show/store functions for top most object */
 703 static ssize_t mcidev_show(struct kobject *kobj, struct attribute *attr,
 704                 char *buffer)
 705 {
 706         struct mem_ctl_info *mem_ctl_info = to_mci(kobj);
 707         struct mcidev_attribute * mcidev_attr = to_mcidev_attr(attr);
 708
 709         if (mcidev_attr->show)
 710                 return mcidev_attr->show(mem_ctl_info, buffer);
 711
 712         return -EIO;
 713 }
 714
 715 static ssize_t mcidev_store(struct kobject *kobj, struct attribute *attr,
 716                 const char *buffer, size_t count)
 717 {
 718         struct mem_ctl_info *mem_ctl_info = to_mci(kobj);
 719         struct mcidev_attribute * mcidev_attr = to_mcidev_attr(attr);
 720
 721         if (mcidev_attr->store)
 722                 return mcidev_attr->store(mem_ctl_info, buffer, count);
 723
 724         return -EIO;
 725 }
 726
 727 static struct sysfs_ops mci_ops = {
 728         .show = mcidev_show,
 729         .store = mcidev_store
 730 };
 731
 732 #define MCIDEV_ATTR(_name,_mode,_show,_store)                   \
 733 static struct mcidev_attribute mci_attr_##_name = {                     \
 734         .attr = {.name = __stringify(_name), .mode = _mode },   \
 735         .show   = _show,                                        \
 736         .store  = _store,                                       \
 737 };
 738
 739 /* default Control file */
 740 MCIDEV_ATTR(reset_counters,S_IWUSR,NULL,mci_reset_counters_store);
 741
 742 /* default Attribute files */
 743 MCIDEV_ATTR(mc_name,S_IRUGO,mci_ctl_name_show,NULL);
 744 MCIDEV_ATTR(size_mb,S_IRUGO,mci_size_mb_show,NULL);
 745 MCIDEV_ATTR(seconds_since_reset,S_IRUGO,mci_seconds_show,NULL);
 746 MCIDEV_ATTR(ue_noinfo_count,S_IRUGO,mci_ue_noinfo_show,NULL);
 747 MCIDEV_ATTR(ce_noinfo_count,S_IRUGO,mci_ce_noinfo_show,NULL);
 748 MCIDEV_ATTR(ue_count,S_IRUGO,mci_ue_count_show,NULL);
 749 MCIDEV_ATTR(ce_count,S_IRUGO,mci_ce_count_show,NULL);
 750
 751 /* memory scrubber attribute file */
 752 MCIDEV_ATTR(sdram_scrub_rate,S_IRUGO|S_IWUSR,mci_sdram_scrub_rate_show,\
 753                         mci_sdram_scrub_rate_store);
 754
 755 static struct mcidev_attribute *mci_attr[] = {
 756         &mci_attr_reset_counters,
 757         &mci_attr_mc_name,
 758         &mci_attr_size_mb,
 759         &mci_attr_seconds_since_reset,
 760         &mci_attr_ue_noinfo_count,
 761         &mci_attr_ce_noinfo_count,
 762         &mci_attr_ue_count,
 763         &mci_attr_ce_count,
 764         &mci_attr_sdram_scrub_rate,
 765         NULL
 766 };
 767
 768 /*
 769  * Release of a MC controlling instance
 770  */
 771 static void edac_mci_instance_release(struct kobject *kobj)
 772 {
 773         struct mem_ctl_info *mci;
 774
 775         mci = to_mci(kobj);
 776         debugf0("%s() idx=%d\n", __func__, mci->mc_idx);
 777         complete(&mci->kobj_complete);
 778 }
 779
 780 static struct kobj_type ktype_mci = {
 781         .release = edac_mci_instance_release,
 782         .sysfs_ops = &mci_ops,
 783         .default_attrs = (struct attribute **) mci_attr,
 784 };
 785
 786
 787 #define EDAC_DEVICE_SYMLINK     "device"
 788
 789 /*
 790  * Create a new Memory Controller kobject instance,
 791  *      mc<id> under the 'mc' directory
 792  *
 793  * Return:
 794  *      0       Success
 795  *      !0      Failure
 796  */
 797 int edac_create_sysfs_mci_device(struct mem_ctl_info *mci)
 798 {
 799         int i;
 800         int err;
 801         struct csrow_info *csrow;
 802         struct kobject *edac_mci_kobj=&mci->edac_mci_kobj;
 803
 804         debugf0("%s() idx=%d\n", __func__, mci->mc_idx);
 805         memset(edac_mci_kobj, 0, sizeof(*edac_mci_kobj));
 806
 807         /* set the name of the mc<id> object */
 808         err = kobject_set_name(edac_mci_kobj,"mc%d",mci->mc_idx);
 809         if (err)
 810                 return err;
 811
 812         /* link to our parent the '..../edac/mc' object */
 813         edac_mci_kobj->parent = &edac_memctrl_kobj;
 814         edac_mci_kobj->ktype = &ktype_mci;
 815
 816         /* register the mc<id> kobject */
 817         err = kobject_register(edac_mci_kobj);
 818         if (err)
 819                 return err;
 820
 821         /* create a symlink for the device */
 822         err = sysfs_create_link(edac_mci_kobj, &mci->dev->kobj,
 823                                 EDAC_DEVICE_SYMLINK);
 824         if (err)
 825                 goto fail0;
 826
 827         /* Make directories for each CSROW object
 828          * under the mc<id> kobject
 829          */
 830         for (i = 0; i < mci->nr_csrows; i++) {
 831                 csrow = &mci->csrows[i];
 832
 833                 /* Only expose populated CSROWs */
 834                 if (csrow->nr_pages > 0) {
 835                         err = edac_create_csrow_object(edac_mci_kobj,csrow,i);
 836                         if (err)
 837                                 goto fail1;
 838                 }
 839         }
 840
 841         return 0;
 842
 843         /* CSROW error: backout what has already been registered,  */
 844 fail1:
 845         for ( i--; i >= 0; i--) {
 846                 if (csrow->nr_pages > 0) {
 847                         init_completion(&csrow->kobj_complete);
 848                         kobject_unregister(&mci->csrows[i].kobj);
 849                         wait_for_completion(&csrow->kobj_complete);
 850                 }
 851         }
 852
 853 fail0:
 854         init_completion(&mci->kobj_complete);
 855         kobject_unregister(edac_mci_kobj);
 856         wait_for_completion(&mci->kobj_complete);
 857         return err;
 858 }
 859
 860 /*
 861  * remove a Memory Controller instance
 862  */
 863 void edac_remove_sysfs_mci_device(struct mem_ctl_info *mci)
 864 {
 865         int i;
 866
 867         debugf0("%s()\n", __func__);
 868
 869         /* remove all csrow kobjects */
 870         for (i = 0; i < mci->nr_csrows; i++) {
 871                 if (mci->csrows[i].nr_pages > 0) {
 872                         init_completion(&mci->csrows[i].kobj_complete);
 873                         kobject_unregister(&mci->csrows[i].kobj);
 874                         wait_for_completion(&mci->csrows[i].kobj_complete);
 875                 }
 876         }
 877
 878         sysfs_remove_link(&mci->edac_mci_kobj, EDAC_DEVICE_SYMLINK);
 879         init_completion(&mci->kobj_complete);
 880         kobject_unregister(&mci->edac_mci_kobj);
 881         wait_for_completion(&mci->kobj_complete);
 882 }
 883
 884