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  * mc poll_msec time value
 127  */
 128 static ssize_t poll_msec_int_store(void *ptr, const char *buffer, size_t count)
 129 {
 130         int *value = (int *)ptr;
 131
 132         if (isdigit(*buffer)) {
 133                 *value = simple_strtoul(buffer, NULL, 0);
 134
 135                 /* notify edac_mc engine to reset the poll period */
 136                 edac_mc_reset_delay_period(*value);
 137         }
 138
 139         return count;
 140 }
 141
 142
 143 /* EDAC sysfs CSROW data structures and methods
 144  */
 145
 146 /* Set of more default csrow<id> attribute show/store functions */
 147 static ssize_t csrow_ue_count_show(struct csrow_info *csrow, char *data,
 148                                 int private)
 149 {
 150         return sprintf(data, "%u\n", csrow->ue_count);
 151 }
 152
 153 static ssize_t csrow_ce_count_show(struct csrow_info *csrow, char *data,
 154                                 int private)
 155 {
 156         return sprintf(data, "%u\n", csrow->ce_count);
 157 }
 158
 159 static ssize_t csrow_size_show(struct csrow_info *csrow, char *data,
 160                                 int private)
 161 {
 162         return sprintf(data, "%u\n", PAGES_TO_MiB(csrow->nr_pages));
 163 }
 164
 165 static ssize_t csrow_mem_type_show(struct csrow_info *csrow, char *data,
 166                                 int private)
 167 {
 168         return sprintf(data, "%s\n", mem_types[csrow->mtype]);
 169 }
 170
 171 static ssize_t csrow_dev_type_show(struct csrow_info *csrow, char *data,
 172                                 int private)
 173 {
 174         return sprintf(data, "%s\n", dev_types[csrow->dtype]);
 175 }
 176
 177 static ssize_t csrow_edac_mode_show(struct csrow_info *csrow, char *data,
 178                                 int private)
 179 {
 180         return sprintf(data, "%s\n", edac_caps[csrow->edac_mode]);
 181 }
 182
 183 /* show/store functions for DIMM Label attributes */
 184 static ssize_t channel_dimm_label_show(struct csrow_info *csrow,
 185                                 char *data, int channel)
 186 {
 187         return snprintf(data, EDAC_MC_LABEL_LEN, "%s",
 188                         csrow->channels[channel].label);
 189 }
 190
 191 static ssize_t channel_dimm_label_store(struct csrow_info *csrow,
 192                                         const char *data,
 193                                         size_t count, int channel)
 194 {
 195         ssize_t max_size = 0;
 196
 197         max_size = min((ssize_t) count, (ssize_t) EDAC_MC_LABEL_LEN - 1);
 198         strncpy(csrow->channels[channel].label, data, max_size);
 199         csrow->channels[channel].label[max_size] = '\0';
 200
 201         return max_size;
 202 }
 203
 204 /* show function for dynamic chX_ce_count attribute */
 205 static ssize_t channel_ce_count_show(struct csrow_info *csrow,
 206                                 char *data, int channel)
 207 {
 208         return sprintf(data, "%u\n", csrow->channels[channel].ce_count);
 209 }
 210
 211 /* csrow specific attribute structure */
 212 struct csrowdev_attribute {
 213         struct attribute attr;
 214          ssize_t(*show) (struct csrow_info *, char *, int);
 215          ssize_t(*store) (struct csrow_info *, const char *, size_t, int);
 216         int private;
 217 };
 218
 219 #define to_csrow(k) container_of(k, struct csrow_info, kobj)
 220 #define to_csrowdev_attr(a) container_of(a, struct csrowdev_attribute, attr)
 221
 222 /* Set of show/store higher level functions for default csrow attributes */
 223 static ssize_t csrowdev_show(struct kobject *kobj,
 224                         struct attribute *attr, char *buffer)
 225 {
 226         struct csrow_info *csrow = to_csrow(kobj);
 227         struct csrowdev_attribute *csrowdev_attr = to_csrowdev_attr(attr);
 228
 229         if (csrowdev_attr->show)
 230                 return csrowdev_attr->show(csrow,
 231                                         buffer, csrowdev_attr->private);
 232         return -EIO;
 233 }
 234
 235 static ssize_t csrowdev_store(struct kobject *kobj, struct attribute *attr,
 236                         const char *buffer, size_t count)
 237 {
 238         struct csrow_info *csrow = to_csrow(kobj);
 239         struct csrowdev_attribute *csrowdev_attr = to_csrowdev_attr(attr);
 240
 241         if (csrowdev_attr->store)
 242                 return csrowdev_attr->store(csrow,
 243                                         buffer,
 244                                         count, csrowdev_attr->private);
 245         return -EIO;
 246 }
 247
 248 static struct sysfs_ops csrowfs_ops = {
 249         .show = csrowdev_show,
 250         .store = csrowdev_store
 251 };
 252
 253 #define CSROWDEV_ATTR(_name,_mode,_show,_store,_private)        \
 254 static struct csrowdev_attribute attr_##_name = {                       \
 255         .attr = {.name = __stringify(_name), .mode = _mode },   \
 256         .show   = _show,                                        \
 257         .store  = _store,                                       \
 258         .private = _private,                                    \
 259 };
 260
 261 /* default cwrow<id>/attribute files */
 262 CSROWDEV_ATTR(size_mb, S_IRUGO, csrow_size_show, NULL, 0);
 263 CSROWDEV_ATTR(dev_type, S_IRUGO, csrow_dev_type_show, NULL, 0);
 264 CSROWDEV_ATTR(mem_type, S_IRUGO, csrow_mem_type_show, NULL, 0);
 265 CSROWDEV_ATTR(edac_mode, S_IRUGO, csrow_edac_mode_show, NULL, 0);
 266 CSROWDEV_ATTR(ue_count, S_IRUGO, csrow_ue_count_show, NULL, 0);
 267 CSROWDEV_ATTR(ce_count, S_IRUGO, csrow_ce_count_show, NULL, 0);
 268
 269 /* default attributes of the CSROW<id> object */
 270 static struct csrowdev_attribute *default_csrow_attr[] = {
 271         &attr_dev_type,
 272         &attr_mem_type,
 273         &attr_edac_mode,
 274         &attr_size_mb,
 275         &attr_ue_count,
 276         &attr_ce_count,
 277         NULL,
 278 };
 279
 280 /* possible dynamic channel DIMM Label attribute files */
 281 CSROWDEV_ATTR(ch0_dimm_label, S_IRUGO | S_IWUSR,
 282         channel_dimm_label_show, channel_dimm_label_store, 0);
 283 CSROWDEV_ATTR(ch1_dimm_label, S_IRUGO | S_IWUSR,
 284         channel_dimm_label_show, channel_dimm_label_store, 1);
 285 CSROWDEV_ATTR(ch2_dimm_label, S_IRUGO | S_IWUSR,
 286         channel_dimm_label_show, channel_dimm_label_store, 2);
 287 CSROWDEV_ATTR(ch3_dimm_label, S_IRUGO | S_IWUSR,
 288         channel_dimm_label_show, channel_dimm_label_store, 3);
 289 CSROWDEV_ATTR(ch4_dimm_label, S_IRUGO | S_IWUSR,
 290         channel_dimm_label_show, channel_dimm_label_store, 4);
 291 CSROWDEV_ATTR(ch5_dimm_label, S_IRUGO | S_IWUSR,
 292         channel_dimm_label_show, channel_dimm_label_store, 5);
 293
 294 /* Total possible dynamic DIMM Label attribute file table */
 295 static struct csrowdev_attribute *dynamic_csrow_dimm_attr[] = {
 296         &attr_ch0_dimm_label,
 297         &attr_ch1_dimm_label,
 298         &attr_ch2_dimm_label,
 299         &attr_ch3_dimm_label,
 300         &attr_ch4_dimm_label,
 301         &attr_ch5_dimm_label
 302 };
 303
 304 /* possible dynamic channel ce_count attribute files */
 305 CSROWDEV_ATTR(ch0_ce_count, S_IRUGO | S_IWUSR, channel_ce_count_show, NULL, 0);
 306 CSROWDEV_ATTR(ch1_ce_count, S_IRUGO | S_IWUSR, channel_ce_count_show, NULL, 1);
 307 CSROWDEV_ATTR(ch2_ce_count, S_IRUGO | S_IWUSR, channel_ce_count_show, NULL, 2);
 308 CSROWDEV_ATTR(ch3_ce_count, S_IRUGO | S_IWUSR, channel_ce_count_show, NULL, 3);
 309 CSROWDEV_ATTR(ch4_ce_count, S_IRUGO | S_IWUSR, channel_ce_count_show, NULL, 4);
 310 CSROWDEV_ATTR(ch5_ce_count, S_IRUGO | S_IWUSR, channel_ce_count_show, NULL, 5);
 311
 312 /* Total possible dynamic ce_count attribute file table */
 313 static struct csrowdev_attribute *dynamic_csrow_ce_count_attr[] = {
 314         &attr_ch0_ce_count,
 315         &attr_ch1_ce_count,
 316         &attr_ch2_ce_count,
 317         &attr_ch3_ce_count,
 318         &attr_ch4_ce_count,
 319         &attr_ch5_ce_count
 320 };
 321
 322 #define EDAC_NR_CHANNELS        6
 323
 324 /* Create dynamic CHANNEL files, indexed by 'chan',  under specifed CSROW */
 325 static int edac_create_channel_files(struct kobject *kobj, int chan)
 326 {
 327         int err = -ENODEV;
 328
 329         if (chan >= EDAC_NR_CHANNELS)
 330                 return err;
 331
 332         /* create the DIMM label attribute file */
 333         err = sysfs_create_file(kobj,
 334                                 (struct attribute *)
 335                                 dynamic_csrow_dimm_attr[chan]);
 336
 337         if (!err) {
 338                 /* create the CE Count attribute file */
 339                 err = sysfs_create_file(kobj,
 340                                         (struct attribute *)
 341                                         dynamic_csrow_ce_count_attr[chan]);
 342         } else {
 343                 debugf1("%s()  dimm labels and ce_count files created",
 344                         __func__);
 345         }
 346
 347         return err;
 348 }
 349
 350 /* No memory to release for this kobj */
 351 static void edac_csrow_instance_release(struct kobject *kobj)
 352 {
 353         struct mem_ctl_info *mci;
 354         struct csrow_info *cs;
 355
 356         debugf1("%s()\n", __func__);
 357
 358         cs = container_of(kobj, struct csrow_info, kobj);
 359         mci = cs->mci;
 360
 361         kobject_put(&mci->edac_mci_kobj);
 362 }
 363
 364 /* the kobj_type instance for a CSROW */
 365 static struct kobj_type ktype_csrow = {
 366         .release = edac_csrow_instance_release,
 367         .sysfs_ops = &csrowfs_ops,
 368         .default_attrs = (struct attribute **)default_csrow_attr,
 369 };
 370
 371 /* Create a CSROW object under specifed edac_mc_device */
 372 static int edac_create_csrow_object(struct mem_ctl_info *mci,
 373                                         struct csrow_info *csrow, int index)
 374 {
 375         struct kobject *kobj_mci = &mci->edac_mci_kobj;
 376         struct kobject *kobj;
 377         int chan;
 378         int err;
 379
 380         /* generate ..../edac/mc/mc<id>/csrow<index>   */
 381         memset(&csrow->kobj, 0, sizeof(csrow->kobj));
 382         csrow->mci = mci;       /* include container up link */
 383
 384         /* bump the mci instance's kobject's ref count */
 385         kobj = kobject_get(&mci->edac_mci_kobj);
 386         if (!kobj) {
 387                 err = -ENODEV;
 388                 goto err_out;
 389         }
 390
 391         /* Instanstiate the csrow object */
 392         err = kobject_init_and_add(&csrow->kobj, &ktype_csrow, kobj_mci,
 393                                    "csrow%d", index);
 394         if (err)
 395                 goto err_release_top_kobj;
 396
 397         /* At this point, to release a csrow kobj, one must
 398          * call the kobject_put and allow that tear down
 399          * to work the releasing
 400          */
 401
 402         /* Create the dyanmic attribute files on this csrow,
 403          * namely, the DIMM labels and the channel ce_count
 404          */
 405         for (chan = 0; chan < csrow->nr_channels; chan++) {
 406                 err = edac_create_channel_files(&csrow->kobj, chan);
 407                 if (err) {
 408                         /* special case the unregister here */
 409                         kobject_put(&csrow->kobj);
 410                         goto err_out;
 411                 }
 412         }
 413         kobject_uevent(&csrow->kobj, KOBJ_ADD);
 414         return 0;
 415
 416         /* error unwind stack */
 417 err_release_top_kobj:
 418         kobject_put(&mci->edac_mci_kobj);
 419
 420 err_out:
 421         return err;
 422 }
 423
 424 /* default sysfs methods and data structures for the main MCI kobject */
 425
 426 static ssize_t mci_reset_counters_store(struct mem_ctl_info *mci,
 427                                         const char *data, size_t count)
 428 {
 429         int row, chan;
 430
 431         mci->ue_noinfo_count = 0;
 432         mci->ce_noinfo_count = 0;
 433         mci->ue_count = 0;
 434         mci->ce_count = 0;
 435
 436         for (row = 0; row < mci->nr_csrows; row++) {
 437                 struct csrow_info *ri = &mci->csrows[row];
 438
 439                 ri->ue_count = 0;
 440                 ri->ce_count = 0;
 441
 442                 for (chan = 0; chan < ri->nr_channels; chan++)
 443                         ri->channels[chan].ce_count = 0;
 444         }
 445
 446         mci->start_time = jiffies;
 447         return count;
 448 }
 449
 450 /* memory scrubbing */
 451 static ssize_t mci_sdram_scrub_rate_store(struct mem_ctl_info *mci,
 452                                         const char *data, size_t count)
 453 {
 454         u32 bandwidth = -1;
 455
 456         if (mci->set_sdram_scrub_rate) {
 457
 458                 memctrl_int_store(&bandwidth, data, count);
 459
 460                 if (!(*mci->set_sdram_scrub_rate) (mci, &bandwidth)) {
 461                         edac_printk(KERN_DEBUG, EDAC_MC,
 462                                 "Scrub rate set successfully, applied: %d\n",
 463                                 bandwidth);
 464                 } else {
 465                         /* FIXME: error codes maybe? */
 466                         edac_printk(KERN_DEBUG, EDAC_MC,
 467                                 "Scrub rate set FAILED, could not apply: %d\n",
 468                                 bandwidth);
 469                 }
 470         } else {
 471                 /* FIXME: produce "not implemented" ERROR for user-side. */
 472                 edac_printk(KERN_WARNING, EDAC_MC,
 473                         "Memory scrubbing 'set'control is not implemented!\n");
 474         }
 475         return count;
 476 }
 477
 478 static ssize_t mci_sdram_scrub_rate_show(struct mem_ctl_info *mci, char *data)
 479 {
 480         u32 bandwidth = -1;
 481
 482         if (mci->get_sdram_scrub_rate) {
 483                 if (!(*mci->get_sdram_scrub_rate) (mci, &bandwidth)) {
 484                         edac_printk(KERN_DEBUG, EDAC_MC,
 485                                 "Scrub rate successfully, fetched: %d\n",
 486                                 bandwidth);
 487                 } else {
 488                         /* FIXME: error codes maybe? */
 489                         edac_printk(KERN_DEBUG, EDAC_MC,
 490                                 "Scrub rate fetch FAILED, got: %d\n",
 491                                 bandwidth);
 492                 }
 493         } else {
 494                 /* FIXME: produce "not implemented" ERROR for user-side.  */
 495                 edac_printk(KERN_WARNING, EDAC_MC,
 496                         "Memory scrubbing 'get' control is not implemented\n");
 497         }
 498         return sprintf(data, "%d\n", bandwidth);
 499 }
 500
 501 /* default attribute files for the MCI object */
 502 static ssize_t mci_ue_count_show(struct mem_ctl_info *mci, char *data)
 503 {
 504         return sprintf(data, "%d\n", mci->ue_count);
 505 }
 506
 507 static ssize_t mci_ce_count_show(struct mem_ctl_info *mci, char *data)
 508 {
 509         return sprintf(data, "%d\n", mci->ce_count);
 510 }
 511
 512 static ssize_t mci_ce_noinfo_show(struct mem_ctl_info *mci, char *data)
 513 {
 514         return sprintf(data, "%d\n", mci->ce_noinfo_count);
 515 }
 516
 517 static ssize_t mci_ue_noinfo_show(struct mem_ctl_info *mci, char *data)
 518 {
 519         return sprintf(data, "%d\n", mci->ue_noinfo_count);
 520 }
 521
 522 static ssize_t mci_seconds_show(struct mem_ctl_info *mci, char *data)
 523 {
 524         return sprintf(data, "%ld\n", (jiffies - mci->start_time) / HZ);
 525 }
 526
 527 static ssize_t mci_ctl_name_show(struct mem_ctl_info *mci, char *data)
 528 {
 529         return sprintf(data, "%s\n", mci->ctl_name);
 530 }
 531
 532 static ssize_t mci_size_mb_show(struct mem_ctl_info *mci, char *data)
 533 {
 534         int total_pages, csrow_idx;
 535
 536         for (total_pages = csrow_idx = 0; csrow_idx < mci->nr_csrows;
 537                 csrow_idx++) {
 538                 struct csrow_info *csrow = &mci->csrows[csrow_idx];
 539
 540                 if (!csrow->nr_pages)
 541                         continue;
 542
 543                 total_pages += csrow->nr_pages;
 544         }
 545
 546         return sprintf(data, "%u\n", PAGES_TO_MiB(total_pages));
 547 }
 548
 549 #define to_mci(k) container_of(k, struct mem_ctl_info, edac_mci_kobj)
 550 #define to_mcidev_attr(a) container_of(a,struct mcidev_sysfs_attribute,attr)
 551
 552 /* MCI show/store functions for top most object */
 553 static ssize_t mcidev_show(struct kobject *kobj, struct attribute *attr,
 554                         char *buffer)
 555 {
 556         struct mem_ctl_info *mem_ctl_info = to_mci(kobj);
 557         struct mcidev_sysfs_attribute *mcidev_attr = to_mcidev_attr(attr);
 558
 559         if (mcidev_attr->show)
 560                 return mcidev_attr->show(mem_ctl_info, buffer);
 561
 562         return -EIO;
 563 }
 564
 565 static ssize_t mcidev_store(struct kobject *kobj, struct attribute *attr,
 566                         const char *buffer, size_t count)
 567 {
 568         struct mem_ctl_info *mem_ctl_info = to_mci(kobj);
 569         struct mcidev_sysfs_attribute *mcidev_attr = to_mcidev_attr(attr);
 570
 571         if (mcidev_attr->store)
 572                 return mcidev_attr->store(mem_ctl_info, buffer, count);
 573
 574         return -EIO;
 575 }
 576
 577 /* Intermediate show/store table */
 578 static struct sysfs_ops mci_ops = {
 579         .show = mcidev_show,
 580         .store = mcidev_store
 581 };
 582
 583 #define MCIDEV_ATTR(_name,_mode,_show,_store)                   \
 584 static struct mcidev_sysfs_attribute mci_attr_##_name = {                       \
 585         .attr = {.name = __stringify(_name), .mode = _mode },   \
 586         .show   = _show,                                        \
 587         .store  = _store,                                       \
 588 };
 589
 590 /* default Control file */
 591 MCIDEV_ATTR(reset_counters, S_IWUSR, NULL, mci_reset_counters_store);
 592
 593 /* default Attribute files */
 594 MCIDEV_ATTR(mc_name, S_IRUGO, mci_ctl_name_show, NULL);
 595 MCIDEV_ATTR(size_mb, S_IRUGO, mci_size_mb_show, NULL);
 596 MCIDEV_ATTR(seconds_since_reset, S_IRUGO, mci_seconds_show, NULL);
 597 MCIDEV_ATTR(ue_noinfo_count, S_IRUGO, mci_ue_noinfo_show, NULL);
 598 MCIDEV_ATTR(ce_noinfo_count, S_IRUGO, mci_ce_noinfo_show, NULL);
 599 MCIDEV_ATTR(ue_count, S_IRUGO, mci_ue_count_show, NULL);
 600 MCIDEV_ATTR(ce_count, S_IRUGO, mci_ce_count_show, NULL);
 601
 602 /* memory scrubber attribute file */
 603 MCIDEV_ATTR(sdram_scrub_rate, S_IRUGO | S_IWUSR, mci_sdram_scrub_rate_show,
 604         mci_sdram_scrub_rate_store);
 605
 606 static struct mcidev_sysfs_attribute *mci_attr[] = {
 607         &mci_attr_reset_counters,
 608         &mci_attr_mc_name,
 609         &mci_attr_size_mb,
 610         &mci_attr_seconds_since_reset,
 611         &mci_attr_ue_noinfo_count,
 612         &mci_attr_ce_noinfo_count,
 613         &mci_attr_ue_count,
 614         &mci_attr_ce_count,
 615         &mci_attr_sdram_scrub_rate,
 616         NULL
 617 };
 618
 619
 620 /*
 621  * Release of a MC controlling instance
 622  *
 623  *      each MC control instance has the following resources upon entry:
 624  *              a) a ref count on the top memctl kobj
 625  *              b) a ref count on this module
 626  *
 627  *      this function must decrement those ref counts and then
 628  *      issue a free on the instance's memory
 629  */
 630 static void edac_mci_control_release(struct kobject *kobj)
 631 {
 632         struct mem_ctl_info *mci;
 633
 634         mci = to_mci(kobj);
 635
 636         debugf0("%s() mci instance idx=%d releasing\n", __func__, mci->mc_idx);
 637
 638         /* decrement the module ref count */
 639         module_put(mci->owner);
 640
 641         /* free the mci instance memory here */
 642         kfree(mci);
 643 }
 644
 645 static struct kobj_type ktype_mci = {
 646         .release = edac_mci_control_release,
 647         .sysfs_ops = &mci_ops,
 648         .default_attrs = (struct attribute **)mci_attr,
 649 };
 650
 651 /* show/store, tables, etc for the MC kset */
 652
 653
 654 struct memctrl_dev_attribute {
 655         struct attribute attr;
 656         void *value;
 657          ssize_t(*show) (void *, char *);
 658          ssize_t(*store) (void *, const char *, size_t);
 659 };
 660
 661 /* Set of show/store abstract level functions for memory control object */
 662 static ssize_t memctrl_dev_show(struct kobject *kobj,
 663                                 struct attribute *attr, char *buffer)
 664 {
 665         struct memctrl_dev_attribute *memctrl_dev;
 666         memctrl_dev = (struct memctrl_dev_attribute *)attr;
 667
 668         if (memctrl_dev->show)
 669                 return memctrl_dev->show(memctrl_dev->value, buffer);
 670
 671         return -EIO;
 672 }
 673
 674 static ssize_t memctrl_dev_store(struct kobject *kobj, struct attribute *attr,
 675                                  const char *buffer, size_t count)
 676 {
 677         struct memctrl_dev_attribute *memctrl_dev;
 678         memctrl_dev = (struct memctrl_dev_attribute *)attr;
 679
 680         if (memctrl_dev->store)
 681                 return memctrl_dev->store(memctrl_dev->value, buffer, count);
 682
 683         return -EIO;
 684 }
 685
 686 static struct sysfs_ops memctrlfs_ops = {
 687         .show = memctrl_dev_show,
 688         .store = memctrl_dev_store
 689 };
 690
 691 #define MEMCTRL_ATTR(_name, _mode, _show, _store)                       \
 692 static struct memctrl_dev_attribute attr_##_name = {                    \
 693         .attr = {.name = __stringify(_name), .mode = _mode },   \
 694         .value  = &_name,                                       \
 695         .show   = _show,                                        \
 696         .store  = _store,                                       \
 697 };
 698
 699 #define MEMCTRL_STRING_ATTR(_name, _data, _mode, _show, _store) \
 700 static struct memctrl_dev_attribute attr_##_name = {                    \
 701         .attr = {.name = __stringify(_name), .mode = _mode },   \
 702         .value  = _data,                                        \
 703         .show   = _show,                                        \
 704         .store  = _store,                                       \
 705 };
 706
 707 /* csrow<id> control files */
 708 MEMCTRL_ATTR(edac_mc_panic_on_ue,
 709         S_IRUGO | S_IWUSR, memctrl_int_show, memctrl_int_store);
 710
 711 MEMCTRL_ATTR(edac_mc_log_ue,
 712         S_IRUGO | S_IWUSR, memctrl_int_show, memctrl_int_store);
 713
 714 MEMCTRL_ATTR(edac_mc_log_ce,
 715         S_IRUGO | S_IWUSR, memctrl_int_show, memctrl_int_store);
 716
 717 MEMCTRL_ATTR(edac_mc_poll_msec,
 718         S_IRUGO | S_IWUSR, memctrl_int_show, poll_msec_int_store);
 719
 720 /* Base Attributes of the memory ECC object */
 721 static struct memctrl_dev_attribute *memctrl_attr[] = {
 722         &attr_edac_mc_panic_on_ue,
 723         &attr_edac_mc_log_ue,
 724         &attr_edac_mc_log_ce,
 725         &attr_edac_mc_poll_msec,
 726         NULL,
 727 };
 728
 729
 730 /* the ktype for the mc_kset internal kobj */
 731 static struct kobj_type ktype_mc_set_attribs = {
 732         .sysfs_ops = &memctrlfs_ops,
 733         .default_attrs = (struct attribute **)memctrl_attr,
 734 };
 735
 736 /* EDAC memory controller sysfs kset:
 737  *      /sys/devices/system/edac/mc
 738  */
 739 static struct kset mc_kset = {
 740         .kobj = {.ktype = &ktype_mc_set_attribs },
 741 };
 742
 743
 744 /*
 745  * edac_mc_register_sysfs_main_kobj
 746  *
 747  *      setups and registers the main kobject for each mci
 748  */
 749 int edac_mc_register_sysfs_main_kobj(struct mem_ctl_info *mci)
 750 {
 751         struct kobject *kobj_mci;
 752         int err;
 753
 754         debugf1("%s()\n", __func__);
 755
 756         kobj_mci = &mci->edac_mci_kobj;
 757
 758         /* Init the mci's kobject */
 759         memset(kobj_mci, 0, sizeof(*kobj_mci));
 760
 761         /* Record which module 'owns' this control structure
 762          * and bump the ref count of the module
 763          */
 764         mci->owner = THIS_MODULE;
 765
 766         /* bump ref count on this module */
 767         if (!try_module_get(mci->owner)) {
 768                 err = -ENODEV;
 769                 goto fail_out;
 770         }
 771
 772         /* this instance become part of the mc_kset */
 773         kobj_mci->kset = &mc_kset;
 774
 775         /* register the mc<id> kobject to the mc_kset */
 776         err = kobject_init_and_add(kobj_mci, &ktype_mci, NULL,
 777                                    "mc%d", mci->mc_idx);
 778         if (err) {
 779                 debugf1("%s()Failed to register '.../edac/mc%d'\n",
 780                         __func__, mci->mc_idx);
 781                 goto kobj_reg_fail;
 782         }
 783         kobject_uevent(kobj_mci, KOBJ_ADD);
 784
 785         /* At this point, to 'free' the control struct,
 786          * edac_mc_unregister_sysfs_main_kobj() must be used
 787          */
 788
 789         debugf1("%s() Registered '.../edac/mc%d' kobject\n",
 790                 __func__, mci->mc_idx);
 791
 792         return 0;
 793
 794         /* Error exit stack */
 795
 796 kobj_reg_fail:
 797         module_put(mci->owner);
 798
 799 fail_out:
 800         return err;
 801 }
 802
 803 /*
 804  * edac_mc_register_sysfs_main_kobj
 805  *
 806  *      tears down and the main mci kobject from the mc_kset
 807  */
 808 void edac_mc_unregister_sysfs_main_kobj(struct mem_ctl_info *mci)
 809 {
 810         /* delete the kobj from the mc_kset */
 811         kobject_put(&mci->edac_mci_kobj);
 812 }
 813
 814 #define EDAC_DEVICE_SYMLINK     "device"
 815
 816 /*
 817  * edac_create_mci_instance_attributes
 818  *      create MC driver specific attributes at the topmost level
 819  *      directory of this mci instance.
 820  */
 821 static int edac_create_mci_instance_attributes(struct mem_ctl_info *mci)
 822 {
 823         int err;
 824         struct mcidev_sysfs_attribute *sysfs_attrib;
 825
 826         /* point to the start of the array and iterate over it
 827          * adding each attribute listed to this mci instance's kobject
 828          */
 829         sysfs_attrib = mci->mc_driver_sysfs_attributes;
 830
 831         while (sysfs_attrib && sysfs_attrib->attr.name) {
 832                 err = sysfs_create_file(&mci->edac_mci_kobj,
 833                                         (struct attribute*) sysfs_attrib);
 834                 if (err) {
 835                         return err;
 836                 }
 837
 838                 sysfs_attrib++;
 839         }
 840
 841         return 0;
 842 }
 843
 844 /*
 845  * edac_remove_mci_instance_attributes
 846  *      remove MC driver specific attributes at the topmost level
 847  *      directory of this mci instance.
 848  */
 849 static void edac_remove_mci_instance_attributes(struct mem_ctl_info *mci)
 850 {
 851         struct mcidev_sysfs_attribute *sysfs_attrib;
 852
 853         /* point to the start of the array and iterate over it
 854          * adding each attribute listed to this mci instance's kobject
 855          */
 856         sysfs_attrib = mci->mc_driver_sysfs_attributes;
 857
 858         /* loop if there are attributes and until we hit a NULL entry */
 859         while (sysfs_attrib && sysfs_attrib->attr.name) {
 860                 sysfs_remove_file(&mci->edac_mci_kobj,
 861                                         (struct attribute *) sysfs_attrib);
 862                 sysfs_attrib++;
 863         }
 864 }
 865
 866
 867 /*
 868  * Create a new Memory Controller kobject instance,
 869  *      mc<id> under the 'mc' directory
 870  *
 871  * Return:
 872  *      0       Success
 873  *      !0      Failure
 874  */
 875 int edac_create_sysfs_mci_device(struct mem_ctl_info *mci)
 876 {
 877         int i;
 878         int err;
 879         struct csrow_info *csrow;
 880         struct kobject *kobj_mci = &mci->edac_mci_kobj;
 881
 882         debugf0("%s() idx=%d\n", __func__, mci->mc_idx);
 883
 884         /* create a symlink for the device */
 885         err = sysfs_create_link(kobj_mci, &mci->dev->kobj,
 886                                 EDAC_DEVICE_SYMLINK);
 887         if (err) {
 888                 debugf1("%s() failure to create symlink\n", __func__);
 889                 goto fail0;
 890         }
 891
 892         /* If the low level driver desires some attributes,
 893          * then create them now for the driver.
 894          */
 895         if (mci->mc_driver_sysfs_attributes) {
 896                 err = edac_create_mci_instance_attributes(mci);
 897                 if (err) {
 898                         debugf1("%s() failure to create mci attributes\n",
 899                                 __func__);
 900                         goto fail0;
 901                 }
 902         }
 903
 904         /* Make directories for each CSROW object under the mc<id> kobject
 905          */
 906         for (i = 0; i < mci->nr_csrows; i++) {
 907                 csrow = &mci->csrows[i];
 908
 909                 /* Only expose populated CSROWs */
 910                 if (csrow->nr_pages > 0) {
 911                         err = edac_create_csrow_object(mci, csrow, i);
 912                         if (err) {
 913                                 debugf1("%s() failure: create csrow %d obj\n",
 914                                         __func__, i);
 915                                 goto fail1;
 916                         }
 917                 }
 918         }
 919
 920         return 0;
 921
 922         /* CSROW error: backout what has already been registered,  */
 923 fail1:
 924         for (i--; i >= 0; i--) {
 925                 if (csrow->nr_pages > 0) {
 926                         kobject_put(&mci->csrows[i].kobj);
 927                 }
 928         }
 929
 930         /* remove the mci instance's attributes, if any */
 931         edac_remove_mci_instance_attributes(mci);
 932
 933         /* remove the symlink */
 934         sysfs_remove_link(kobj_mci, EDAC_DEVICE_SYMLINK);
 935
 936 fail0:
 937         return err;
 938 }
 939
 940 /*
 941  * remove a Memory Controller instance
 942  */
 943 void edac_remove_sysfs_mci_device(struct mem_ctl_info *mci)
 944 {
 945         int i;
 946
 947         debugf0("%s()\n", __func__);
 948
 949         /* remove all csrow kobjects */
 950         for (i = 0; i < mci->nr_csrows; i++) {
 951                 if (mci->csrows[i].nr_pages > 0) {
 952                         debugf0("%s()  unreg csrow-%d\n", __func__, i);
 953                         kobject_put(&mci->csrows[i].kobj);
 954                 }
 955         }
 956
 957         debugf0("%s()  remove_link\n", __func__);
 958
 959         /* remove the symlink */
 960         sysfs_remove_link(&mci->edac_mci_kobj, EDAC_DEVICE_SYMLINK);
 961
 962         debugf0("%s()  remove_mci_instance\n", __func__);
 963
 964         /* remove this mci instance's attribtes */
 965         edac_remove_mci_instance_attributes(mci);
 966
 967         debugf0("%s()  unregister this mci kobj\n", __func__);
 968
 969         /* unregister this instance's kobject */
 970         kobject_put(&mci->edac_mci_kobj);
 971 }
 972
 973
 974
 975
 976 /*
 977  * edac_setup_sysfs_mc_kset(void)
 978  *
 979  * Initialize the mc_kset for the 'mc' entry
 980  *      This requires creating the top 'mc' directory with a kset
 981  *      and its controls/attributes.
 982  *
 983  *      To this 'mc' kset, instance 'mci' will be grouped as children.
 984  *
 985  * Return:  0 SUCCESS
 986  *         !0 FAILURE error code
 987  */
 988 int edac_sysfs_setup_mc_kset(void)
 989 {
 990         int err = 0;
 991         struct sysdev_class *edac_class;
 992
 993         debugf1("%s()\n", __func__);
 994
 995         /* get the /sys/devices/system/edac class reference */
 996         edac_class = edac_get_edac_class();
 997         if (edac_class == NULL) {
 998                 debugf1("%s() no edac_class error=%d\n", __func__, err);
 999                 goto fail_out;
1000         }
1001
1002         /* Init the MC's kobject */
1003         kobject_set_name(&mc_kset.kobj, "mc");
1004         mc_kset.kobj.parent = &edac_class->kset.kobj;
1005
1006         /* register the mc_kset */
1007         err = kset_register(&mc_kset);
1008         if (err) {
1009                 debugf1("%s() Failed to register '.../edac/mc'\n", __func__);
1010                 goto fail_out;
1011         }
1012
1013         debugf1("%s() Registered '.../edac/mc' kobject\n", __func__);
1014
1015         return 0;
1016
1017
1018         /* error unwind stack */
1019 fail_out:
1020         return err;
1021 }
1022
1023 /*
1024  * edac_sysfs_teardown_mc_kset
1025  *
1026  *      deconstruct the mc_ket for memory controllers
1027  */
1028 void edac_sysfs_teardown_mc_kset(void)
1029 {
1030         kset_unregister(&mc_kset);
1031 }
1032