drivers/edac/edac_mc_sysfs.c

   1 /*
   2  * edac_mc kernel module
   3  * (C) 2005-2007 Linux Networx (http://lnxi.com)
   4  *
   5  * This file may be distributed under the terms of the
   6  * GNU General Public License.
   7  *
   8  * Written Doug Thompson <norsk5@xmission.com> www.softwarebitmaker.com
   9  *
  10  */
  11
  12 #include <linux/ctype.h>
  13 #include <linux/slab.h>
  14 #include <linux/edac.h>
  15 #include <linux/bug.h>
  16
  17 #include "edac_core.h"
  18 #include "edac_module.h"
  19
  20
  21 /* MC EDAC Controls, setable by module parameter, and sysfs */
  22 static int edac_mc_log_ue = 1;
  23 static int edac_mc_log_ce = 1;
  24 static int edac_mc_panic_on_ue;
  25 static int edac_mc_poll_msec = 1000;
  26
  27 /* Getter functions for above */
  28 int edac_mc_get_log_ue(void)
  29 {
  30         return edac_mc_log_ue;
  31 }
  32
  33 int edac_mc_get_log_ce(void)
  34 {
  35         return edac_mc_log_ce;
  36 }
  37
  38 int edac_mc_get_panic_on_ue(void)
  39 {
  40         return edac_mc_panic_on_ue;
  41 }
  42
  43 /* this is temporary */
  44 int edac_mc_get_poll_msec(void)
  45 {
  46         return edac_mc_poll_msec;
  47 }
  48
  49 static int edac_set_poll_msec(const char *val, struct kernel_param *kp)
  50 {
  51         long l;
  52         int ret;
  53
  54         if (!val)
  55                 return -EINVAL;
  56
  57         ret = strict_strtol(val, 0, &l);
  58         if (ret == -EINVAL || ((int)l != l))
  59                 return -EINVAL;
  60         *((int *)kp->arg) = l;
  61
  62         /* notify edac_mc engine to reset the poll period */
  63         edac_mc_reset_delay_period(l);
  64
  65         return 0;
  66 }
  67
  68 /* Parameter declarations for above */
  69 module_param(edac_mc_panic_on_ue, int, 0644);
  70 MODULE_PARM_DESC(edac_mc_panic_on_ue, "Panic on uncorrected error: 0=off 1=on");
  71 module_param(edac_mc_log_ue, int, 0644);
  72 MODULE_PARM_DESC(edac_mc_log_ue,
  73                  "Log uncorrectable error to console: 0=off 1=on");
  74 module_param(edac_mc_log_ce, int, 0644);
  75 MODULE_PARM_DESC(edac_mc_log_ce,
  76                  "Log correctable error to console: 0=off 1=on");
  77 module_param_call(edac_mc_poll_msec, edac_set_poll_msec, param_get_int,
  78                   &edac_mc_poll_msec, 0644);
  79 MODULE_PARM_DESC(edac_mc_poll_msec, "Polling period in milliseconds");
  80
  81 /*
  82  * various constants for Memory Controllers
  83  */
  84 static const char *mem_types[] = {
  85         [MEM_EMPTY] = "Empty",
  86         [MEM_RESERVED] = "Reserved",
  87         [MEM_UNKNOWN] = "Unknown",
  88         [MEM_FPM] = "FPM",
  89         [MEM_EDO] = "EDO",
  90         [MEM_BEDO] = "BEDO",
  91         [MEM_SDR] = "Unbuffered-SDR",
  92         [MEM_RDR] = "Registered-SDR",
  93         [MEM_DDR] = "Unbuffered-DDR",
  94         [MEM_RDDR] = "Registered-DDR",
  95         [MEM_RMBS] = "RMBS",
  96         [MEM_DDR2] = "Unbuffered-DDR2",
  97         [MEM_FB_DDR2] = "FullyBuffered-DDR2",
  98         [MEM_RDDR2] = "Registered-DDR2",
  99         [MEM_XDR] = "XDR",
 100         [MEM_DDR3] = "Unbuffered-DDR3",
 101         [MEM_RDDR3] = "Registered-DDR3"
 102 };
 103
 104 static const char *dev_types[] = {
 105         [DEV_UNKNOWN] = "Unknown",
 106         [DEV_X1] = "x1",
 107         [DEV_X2] = "x2",
 108         [DEV_X4] = "x4",
 109         [DEV_X8] = "x8",
 110         [DEV_X16] = "x16",
 111         [DEV_X32] = "x32",
 112         [DEV_X64] = "x64"
 113 };
 114
 115 static const char *edac_caps[] = {
 116         [EDAC_UNKNOWN] = "Unknown",
 117         [EDAC_NONE] = "None",
 118         [EDAC_RESERVED] = "Reserved",
 119         [EDAC_PARITY] = "PARITY",
 120         [EDAC_EC] = "EC",
 121         [EDAC_SECDED] = "SECDED",
 122         [EDAC_S2ECD2ED] = "S2ECD2ED",
 123         [EDAC_S4ECD4ED] = "S4ECD4ED",
 124         [EDAC_S8ECD8ED] = "S8ECD8ED",
 125         [EDAC_S16ECD16ED] = "S16ECD16ED"
 126 };
 127
 128 /* EDAC sysfs CSROW data structures and methods
 129  */
 130
 131 /* Set of more default csrow<id> attribute show/store functions */
 132 static ssize_t csrow_ue_count_show(struct csrow_info *csrow, char *data,
 133                                 int private)
 134 {
 135         return sprintf(data, "%u\n", csrow->ue_count);
 136 }
 137
 138 static ssize_t csrow_ce_count_show(struct csrow_info *csrow, char *data,
 139                                 int private)
 140 {
 141         return sprintf(data, "%u\n", csrow->ce_count);
 142 }
 143
 144 static ssize_t csrow_size_show(struct csrow_info *csrow, char *data,
 145                                 int private)
 146 {
 147         return sprintf(data, "%u\n", PAGES_TO_MiB(csrow->nr_pages));
 148 }
 149
 150 static ssize_t csrow_mem_type_show(struct csrow_info *csrow, char *data,
 151                                 int private)
 152 {
 153         return sprintf(data, "%s\n", mem_types[csrow->mtype]);
 154 }
 155
 156 static ssize_t csrow_dev_type_show(struct csrow_info *csrow, char *data,
 157                                 int private)
 158 {
 159         return sprintf(data, "%s\n", dev_types[csrow->dtype]);
 160 }
 161
 162 static ssize_t csrow_edac_mode_show(struct csrow_info *csrow, char *data,
 163                                 int private)
 164 {
 165         return sprintf(data, "%s\n", edac_caps[csrow->edac_mode]);
 166 }
 167
 168 /* show/store functions for DIMM Label attributes */
 169 static ssize_t channel_dimm_label_show(struct csrow_info *csrow,
 170                                 char *data, int channel)
 171 {
 172         /* if field has not been initialized, there is nothing to send */
 173         if (!csrow->channels[channel].label[0])
 174                 return 0;
 175
 176         return snprintf(data, EDAC_MC_LABEL_LEN, "%s\n",
 177                         csrow->channels[channel].label);
 178 }
 179
 180 static ssize_t channel_dimm_label_store(struct csrow_info *csrow,
 181                                         const char *data,
 182                                         size_t count, int channel)
 183 {
 184         ssize_t max_size = 0;
 185
 186         max_size = min((ssize_t) count, (ssize_t) EDAC_MC_LABEL_LEN - 1);
 187         strncpy(csrow->channels[channel].label, data, max_size);
 188         csrow->channels[channel].label[max_size] = '\0';
 189
 190         return max_size;
 191 }
 192
 193 /* show function for dynamic chX_ce_count attribute */
 194 static ssize_t channel_ce_count_show(struct csrow_info *csrow,
 195                                 char *data, int channel)
 196 {
 197         return sprintf(data, "%u\n", csrow->channels[channel].ce_count);
 198 }
 199
 200 /* csrow specific attribute structure */
 201 struct csrowdev_attribute {
 202         struct attribute attr;
 203          ssize_t(*show) (struct csrow_info *, char *, int);
 204          ssize_t(*store) (struct csrow_info *, const char *, size_t, int);
 205         int private;
 206 };
 207
 208 #define to_csrow(k) container_of(k, struct csrow_info, kobj)
 209 #define to_csrowdev_attr(a) container_of(a, struct csrowdev_attribute, attr)
 210
 211 /* Set of show/store higher level functions for default csrow attributes */
 212 static ssize_t csrowdev_show(struct kobject *kobj,
 213                         struct attribute *attr, char *buffer)
 214 {
 215         struct csrow_info *csrow = to_csrow(kobj);
 216         struct csrowdev_attribute *csrowdev_attr = to_csrowdev_attr(attr);
 217
 218         if (csrowdev_attr->show)
 219                 return csrowdev_attr->show(csrow,
 220                                         buffer, csrowdev_attr->private);
 221         return -EIO;
 222 }
 223
 224 static ssize_t csrowdev_store(struct kobject *kobj, struct attribute *attr,
 225                         const char *buffer, size_t count)
 226 {
 227         struct csrow_info *csrow = to_csrow(kobj);
 228         struct csrowdev_attribute *csrowdev_attr = to_csrowdev_attr(attr);
 229
 230         if (csrowdev_attr->store)
 231                 return csrowdev_attr->store(csrow,
 232                                         buffer,
 233                                         count, csrowdev_attr->private);
 234         return -EIO;
 235 }
 236
 237 static const struct sysfs_ops csrowfs_ops = {
 238         .show = csrowdev_show,
 239         .store = csrowdev_store
 240 };
 241
 242 #define CSROWDEV_ATTR(_name,_mode,_show,_store,_private)        \
 243 static struct csrowdev_attribute attr_##_name = {                       \
 244         .attr = {.name = __stringify(_name), .mode = _mode },   \
 245         .show   = _show,                                        \
 246         .store  = _store,                                       \
 247         .private = _private,                                    \
 248 };
 249
 250 /* default cwrow<id>/attribute files */
 251 CSROWDEV_ATTR(size_mb, S_IRUGO, csrow_size_show, NULL, 0);
 252 CSROWDEV_ATTR(dev_type, S_IRUGO, csrow_dev_type_show, NULL, 0);
 253 CSROWDEV_ATTR(mem_type, S_IRUGO, csrow_mem_type_show, NULL, 0);
 254 CSROWDEV_ATTR(edac_mode, S_IRUGO, csrow_edac_mode_show, NULL, 0);
 255 CSROWDEV_ATTR(ue_count, S_IRUGO, csrow_ue_count_show, NULL, 0);
 256 CSROWDEV_ATTR(ce_count, S_IRUGO, csrow_ce_count_show, NULL, 0);
 257
 258 /* default attributes of the CSROW<id> object */
 259 static struct csrowdev_attribute *default_csrow_attr[] = {
 260         &attr_dev_type,
 261         &attr_mem_type,
 262         &attr_edac_mode,
 263         &attr_size_mb,
 264         &attr_ue_count,
 265         &attr_ce_count,
 266         NULL,
 267 };
 268
 269 /* possible dynamic channel DIMM Label attribute files */
 270 CSROWDEV_ATTR(ch0_dimm_label, S_IRUGO | S_IWUSR,
 271         channel_dimm_label_show, channel_dimm_label_store, 0);
 272 CSROWDEV_ATTR(ch1_dimm_label, S_IRUGO | S_IWUSR,
 273         channel_dimm_label_show, channel_dimm_label_store, 1);
 274 CSROWDEV_ATTR(ch2_dimm_label, S_IRUGO | S_IWUSR,
 275         channel_dimm_label_show, channel_dimm_label_store, 2);
 276 CSROWDEV_ATTR(ch3_dimm_label, S_IRUGO | S_IWUSR,
 277         channel_dimm_label_show, channel_dimm_label_store, 3);
 278 CSROWDEV_ATTR(ch4_dimm_label, S_IRUGO | S_IWUSR,
 279         channel_dimm_label_show, channel_dimm_label_store, 4);
 280 CSROWDEV_ATTR(ch5_dimm_label, S_IRUGO | S_IWUSR,
 281         channel_dimm_label_show, channel_dimm_label_store, 5);
 282
 283 /* Total possible dynamic DIMM Label attribute file table */
 284 static struct csrowdev_attribute *dynamic_csrow_dimm_attr[] = {
 285         &attr_ch0_dimm_label,
 286         &attr_ch1_dimm_label,
 287         &attr_ch2_dimm_label,
 288         &attr_ch3_dimm_label,
 289         &attr_ch4_dimm_label,
 290         &attr_ch5_dimm_label
 291 };
 292
 293 /* possible dynamic channel ce_count attribute files */
 294 CSROWDEV_ATTR(ch0_ce_count, S_IRUGO | S_IWUSR, channel_ce_count_show, NULL, 0);
 295 CSROWDEV_ATTR(ch1_ce_count, S_IRUGO | S_IWUSR, channel_ce_count_show, NULL, 1);
 296 CSROWDEV_ATTR(ch2_ce_count, S_IRUGO | S_IWUSR, channel_ce_count_show, NULL, 2);
 297 CSROWDEV_ATTR(ch3_ce_count, S_IRUGO | S_IWUSR, channel_ce_count_show, NULL, 3);
 298 CSROWDEV_ATTR(ch4_ce_count, S_IRUGO | S_IWUSR, channel_ce_count_show, NULL, 4);
 299 CSROWDEV_ATTR(ch5_ce_count, S_IRUGO | S_IWUSR, channel_ce_count_show, NULL, 5);
 300
 301 /* Total possible dynamic ce_count attribute file table */
 302 static struct csrowdev_attribute *dynamic_csrow_ce_count_attr[] = {
 303         &attr_ch0_ce_count,
 304         &attr_ch1_ce_count,
 305         &attr_ch2_ce_count,
 306         &attr_ch3_ce_count,
 307         &attr_ch4_ce_count,
 308         &attr_ch5_ce_count
 309 };
 310
 311 #define EDAC_NR_CHANNELS        6
 312
 313 /* Create dynamic CHANNEL files, indexed by 'chan',  under specifed CSROW */
 314 static int edac_create_channel_files(struct kobject *kobj, int chan)
 315 {
 316         int err = -ENODEV;
 317
 318         if (chan >= EDAC_NR_CHANNELS)
 319                 return err;
 320
 321         /* create the DIMM label attribute file */
 322         err = sysfs_create_file(kobj,
 323                                 (struct attribute *)
 324                                 dynamic_csrow_dimm_attr[chan]);
 325
 326         if (!err) {
 327                 /* create the CE Count attribute file */
 328                 err = sysfs_create_file(kobj,
 329                                         (struct attribute *)
 330                                         dynamic_csrow_ce_count_attr[chan]);
 331         } else {
 332                 debugf1("%s()  dimm labels and ce_count files created",
 333                         __func__);
 334         }
 335
 336         return err;
 337 }
 338
 339 /* No memory to release for this kobj */
 340 static void edac_csrow_instance_release(struct kobject *kobj)
 341 {
 342         struct mem_ctl_info *mci;
 343         struct csrow_info *cs;
 344
 345         debugf1("%s()\n", __func__);
 346
 347         cs = container_of(kobj, struct csrow_info, kobj);
 348         mci = cs->mci;
 349
 350         kobject_put(&mci->edac_mci_kobj);
 351 }
 352
 353 /* the kobj_type instance for a CSROW */
 354 static struct kobj_type ktype_csrow = {
 355         .release = edac_csrow_instance_release,
 356         .sysfs_ops = &csrowfs_ops,
 357         .default_attrs = (struct attribute **)default_csrow_attr,
 358 };
 359
 360 /* Create a CSROW object under specifed edac_mc_device */
 361 static int edac_create_csrow_object(struct mem_ctl_info *mci,
 362                                         struct csrow_info *csrow, int index)
 363 {
 364         struct kobject *kobj_mci = &mci->edac_mci_kobj;
 365         struct kobject *kobj;
 366         int chan;
 367         int err;
 368
 369         /* generate ..../edac/mc/mc<id>/csrow<index>   */
 370         memset(&csrow->kobj, 0, sizeof(csrow->kobj));
 371         csrow->mci = mci;       /* include container up link */
 372
 373         /* bump the mci instance's kobject's ref count */
 374         kobj = kobject_get(&mci->edac_mci_kobj);
 375         if (!kobj) {
 376                 err = -ENODEV;
 377                 goto err_out;
 378         }
 379
 380         /* Instanstiate the csrow object */
 381         err = kobject_init_and_add(&csrow->kobj, &ktype_csrow, kobj_mci,
 382                                    "csrow%d", index);
 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_put 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_put(&csrow->kobj);
 399                         goto err_out;
 400                 }
 401         }
 402         kobject_uevent(&csrow->kobj, KOBJ_ADD);
 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 interface:
 440  *
 441  * A MC driver can limit the scrubbing bandwidth based on the CPU type.
 442  * Therefore, ->set_sdram_scrub_rate should be made to return the actual
 443  * bandwidth that is accepted or 0 when scrubbing is to be disabled.
 444  *
 445  * Negative value still means that an error has occurred while setting
 446  * the scrub rate.
 447  */
 448 static ssize_t mci_sdram_scrub_rate_store(struct mem_ctl_info *mci,
 449                                           const char *data, size_t count)
 450 {
 451         unsigned long bandwidth = 0;
 452         int new_bw = 0;
 453
 454         if (!mci->set_sdram_scrub_rate)
 455                 return -EINVAL;
 456
 457         if (strict_strtoul(data, 10, &bandwidth) < 0)
 458                 return -EINVAL;
 459
 460         new_bw = mci->set_sdram_scrub_rate(mci, bandwidth);
 461         if (new_bw >= 0) {
 462                 edac_printk(KERN_DEBUG, EDAC_MC, "Scrub rate set to %d\n", new_bw);
 463                 return count;
 464         }
 465
 466         edac_printk(KERN_DEBUG, EDAC_MC, "Error setting scrub rate to: %lu\n", bandwidth);
 467         return -EINVAL;
 468 }
 469
 470 /*
 471  * ->get_sdram_scrub_rate() return value semantics same as above.
 472  */
 473 static ssize_t mci_sdram_scrub_rate_show(struct mem_ctl_info *mci, char *data)
 474 {
 475         int bandwidth = 0;
 476
 477         if (!mci->get_sdram_scrub_rate)
 478                 return -EINVAL;
 479
 480         bandwidth = mci->get_sdram_scrub_rate(mci);
 481         if (bandwidth < 0) {
 482                 edac_printk(KERN_DEBUG, EDAC_MC, "Error reading scrub rate\n");
 483                 return bandwidth;
 484         }
 485
 486         edac_printk(KERN_DEBUG, EDAC_MC, "Read scrub rate: %d\n", bandwidth);
 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         debugf1("%s() mem_ctl_info %p\n", __func__, mem_ctl_info);
 549
 550         if (mcidev_attr->show)
 551                 return mcidev_attr->show(mem_ctl_info, buffer);
 552
 553         return -EIO;
 554 }
 555
 556 static ssize_t mcidev_store(struct kobject *kobj, struct attribute *attr,
 557                         const char *buffer, size_t count)
 558 {
 559         struct mem_ctl_info *mem_ctl_info = to_mci(kobj);
 560         struct mcidev_sysfs_attribute *mcidev_attr = to_mcidev_attr(attr);
 561
 562         debugf1("%s() mem_ctl_info %p\n", __func__, mem_ctl_info);
 563
 564         if (mcidev_attr->store)
 565                 return mcidev_attr->store(mem_ctl_info, buffer, count);
 566
 567         return -EIO;
 568 }
 569
 570 /* Intermediate show/store table */
 571 static const struct sysfs_ops mci_ops = {
 572         .show = mcidev_show,
 573         .store = mcidev_store
 574 };
 575
 576 #define MCIDEV_ATTR(_name,_mode,_show,_store)                   \
 577 static struct mcidev_sysfs_attribute mci_attr_##_name = {                       \
 578         .attr = {.name = __stringify(_name), .mode = _mode },   \
 579         .show   = _show,                                        \
 580         .store  = _store,                                       \
 581 };
 582
 583 /* default Control file */
 584 MCIDEV_ATTR(reset_counters, S_IWUSR, NULL, mci_reset_counters_store);
 585
 586 /* default Attribute files */
 587 MCIDEV_ATTR(mc_name, S_IRUGO, mci_ctl_name_show, NULL);
 588 MCIDEV_ATTR(size_mb, S_IRUGO, mci_size_mb_show, NULL);
 589 MCIDEV_ATTR(seconds_since_reset, S_IRUGO, mci_seconds_show, NULL);
 590 MCIDEV_ATTR(ue_noinfo_count, S_IRUGO, mci_ue_noinfo_show, NULL);
 591 MCIDEV_ATTR(ce_noinfo_count, S_IRUGO, mci_ce_noinfo_show, NULL);
 592 MCIDEV_ATTR(ue_count, S_IRUGO, mci_ue_count_show, NULL);
 593 MCIDEV_ATTR(ce_count, S_IRUGO, mci_ce_count_show, NULL);
 594
 595 /* memory scrubber attribute file */
 596 MCIDEV_ATTR(sdram_scrub_rate, S_IRUGO | S_IWUSR, mci_sdram_scrub_rate_show,
 597         mci_sdram_scrub_rate_store);
 598
 599 static struct mcidev_sysfs_attribute *mci_attr[] = {
 600         &mci_attr_reset_counters,
 601         &mci_attr_mc_name,
 602         &mci_attr_size_mb,
 603         &mci_attr_seconds_since_reset,
 604         &mci_attr_ue_noinfo_count,
 605         &mci_attr_ce_noinfo_count,
 606         &mci_attr_ue_count,
 607         &mci_attr_ce_count,
 608         &mci_attr_sdram_scrub_rate,
 609         NULL
 610 };
 611
 612
 613 /*
 614  * Release of a MC controlling instance
 615  *
 616  *      each MC control instance has the following resources upon entry:
 617  *              a) a ref count on the top memctl kobj
 618  *              b) a ref count on this module
 619  *
 620  *      this function must decrement those ref counts and then
 621  *      issue a free on the instance's memory
 622  */
 623 static void edac_mci_control_release(struct kobject *kobj)
 624 {
 625         struct mem_ctl_info *mci;
 626
 627         mci = to_mci(kobj);
 628
 629         debugf0("%s() mci instance idx=%d releasing\n", __func__, mci->mc_idx);
 630
 631         /* decrement the module ref count */
 632         module_put(mci->owner);
 633 }
 634
 635 static struct kobj_type ktype_mci = {
 636         .release = edac_mci_control_release,
 637         .sysfs_ops = &mci_ops,
 638         .default_attrs = (struct attribute **)mci_attr,
 639 };
 640
 641 /* EDAC memory controller sysfs kset:
 642  *      /sys/devices/system/edac/mc
 643  */
 644 static struct kset *mc_kset;
 645
 646 /*
 647  * edac_mc_register_sysfs_main_kobj
 648  *
 649  *      setups and registers the main kobject for each mci
 650  */
 651 int edac_mc_register_sysfs_main_kobj(struct mem_ctl_info *mci)
 652 {
 653         struct kobject *kobj_mci;
 654         int err;
 655
 656         debugf1("%s()\n", __func__);
 657
 658         kobj_mci = &mci->edac_mci_kobj;
 659
 660         /* Init the mci's kobject */
 661         memset(kobj_mci, 0, sizeof(*kobj_mci));
 662
 663         /* Record which module 'owns' this control structure
 664          * and bump the ref count of the module
 665          */
 666         mci->owner = THIS_MODULE;
 667
 668         /* bump ref count on this module */
 669         if (!try_module_get(mci->owner)) {
 670                 err = -ENODEV;
 671                 goto fail_out;
 672         }
 673
 674         /* this instance become part of the mc_kset */
 675         kobj_mci->kset = mc_kset;
 676
 677         /* register the mc<id> kobject to the mc_kset */
 678         err = kobject_init_and_add(kobj_mci, &ktype_mci, NULL,
 679                                    "mc%d", mci->mc_idx);
 680         if (err) {
 681                 debugf1("%s()Failed to register '.../edac/mc%d'\n",
 682                         __func__, mci->mc_idx);
 683                 goto kobj_reg_fail;
 684         }
 685         kobject_uevent(kobj_mci, KOBJ_ADD);
 686
 687         /* At this point, to 'free' the control struct,
 688          * edac_mc_unregister_sysfs_main_kobj() must be used
 689          */
 690
 691         debugf1("%s() Registered '.../edac/mc%d' kobject\n",
 692                 __func__, mci->mc_idx);
 693
 694         return 0;
 695
 696         /* Error exit stack */
 697
 698 kobj_reg_fail:
 699         module_put(mci->owner);
 700
 701 fail_out:
 702         return err;
 703 }
 704
 705 /*
 706  * edac_mc_register_sysfs_main_kobj
 707  *
 708  *      tears down and the main mci kobject from the mc_kset
 709  */
 710 void edac_mc_unregister_sysfs_main_kobj(struct mem_ctl_info *mci)
 711 {
 712         debugf1("%s()\n", __func__);
 713
 714         /* delete the kobj from the mc_kset */
 715         kobject_put(&mci->edac_mci_kobj);
 716 }
 717
 718 #define EDAC_DEVICE_SYMLINK     "device"
 719
 720 #define grp_to_mci(k) (container_of(k, struct mcidev_sysfs_group_kobj, kobj)->mci)
 721
 722 /* MCI show/store functions for top most object */
 723 static ssize_t inst_grp_show(struct kobject *kobj, struct attribute *attr,
 724                         char *buffer)
 725 {
 726         struct mem_ctl_info *mem_ctl_info = grp_to_mci(kobj);
 727         struct mcidev_sysfs_attribute *mcidev_attr = to_mcidev_attr(attr);
 728
 729         debugf1("%s() mem_ctl_info %p\n", __func__, mem_ctl_info);
 730
 731         if (mcidev_attr->show)
 732                 return mcidev_attr->show(mem_ctl_info, buffer);
 733
 734         return -EIO;
 735 }
 736
 737 static ssize_t inst_grp_store(struct kobject *kobj, struct attribute *attr,
 738                         const char *buffer, size_t count)
 739 {
 740         struct mem_ctl_info *mem_ctl_info = grp_to_mci(kobj);
 741         struct mcidev_sysfs_attribute *mcidev_attr = to_mcidev_attr(attr);
 742
 743         debugf1("%s() mem_ctl_info %p\n", __func__, mem_ctl_info);
 744
 745         if (mcidev_attr->store)
 746                 return mcidev_attr->store(mem_ctl_info, buffer, count);
 747
 748         return -EIO;
 749 }
 750
 751 /* No memory to release for this kobj */
 752 static void edac_inst_grp_release(struct kobject *kobj)
 753 {
 754         struct mcidev_sysfs_group_kobj *grp;
 755         struct mem_ctl_info *mci;
 756
 757         debugf1("%s()\n", __func__);
 758
 759         grp = container_of(kobj, struct mcidev_sysfs_group_kobj, kobj);
 760         mci = grp->mci;
 761 }
 762
 763 /* Intermediate show/store table */
 764 static struct sysfs_ops inst_grp_ops = {
 765         .show = inst_grp_show,
 766         .store = inst_grp_store
 767 };
 768
 769 /* the kobj_type instance for a instance group */
 770 static struct kobj_type ktype_inst_grp = {
 771         .release = edac_inst_grp_release,
 772         .sysfs_ops = &inst_grp_ops,
 773 };
 774
 775
 776 /*
 777  * edac_create_mci_instance_attributes
 778  *      create MC driver specific attributes bellow an specified kobj
 779  * This routine calls itself recursively, in order to create an entire
 780  * object tree.
 781  */
 782 static int edac_create_mci_instance_attributes(struct mem_ctl_info *mci,
 783                                 const struct mcidev_sysfs_attribute *sysfs_attrib,
 784                                 struct kobject *kobj)
 785 {
 786         int err;
 787
 788         debugf1("%s()\n", __func__);
 789
 790         while (sysfs_attrib) {
 791                 debugf1("%s() sysfs_attrib = %p\n",__func__, sysfs_attrib);
 792                 if (sysfs_attrib->grp) {
 793                         struct mcidev_sysfs_group_kobj *grp_kobj;
 794
 795                         grp_kobj = kzalloc(sizeof(*grp_kobj), GFP_KERNEL);
 796                         if (!grp_kobj)
 797                                 return -ENOMEM;
 798
 799                         grp_kobj->grp = sysfs_attrib->grp;
 800                         grp_kobj->mci = mci;
 801                         list_add_tail(&grp_kobj->list, &mci->grp_kobj_list);
 802
 803                         debugf0("%s() grp %s, mci %p\n", __func__,
 804                                 sysfs_attrib->grp->name, mci);
 805
 806                         err = kobject_init_and_add(&grp_kobj->kobj,
 807                                                 &ktype_inst_grp,
 808                                                 &mci->edac_mci_kobj,
 809                                                 sysfs_attrib->grp->name);
 810                         if (err < 0) {
 811                                 printk(KERN_ERR "kobject_init_and_add failed: %d\n", err);
 812                                 return err;
 813                         }
 814                         err = edac_create_mci_instance_attributes(mci,
 815                                         grp_kobj->grp->mcidev_attr,
 816                                         &grp_kobj->kobj);
 817
 818                         if (err < 0)
 819                                 return err;
 820                 } else if (sysfs_attrib->attr.name) {
 821                         debugf0("%s() file %s\n", __func__,
 822                                 sysfs_attrib->attr.name);
 823
 824                         err = sysfs_create_file(kobj, &sysfs_attrib->attr);
 825                         if (err < 0) {
 826                                 printk(KERN_ERR "sysfs_create_file failed: %d\n", err);
 827                                 return err;
 828                         }
 829                 } else
 830                         break;
 831
 832                 sysfs_attrib++;
 833         }
 834
 835         return 0;
 836 }
 837
 838 /*
 839  * edac_remove_mci_instance_attributes
 840  *      remove MC driver specific attributes at the topmost level
 841  *      directory of this mci instance.
 842  */
 843 static void edac_remove_mci_instance_attributes(struct mem_ctl_info *mci,
 844                                 const struct mcidev_sysfs_attribute *sysfs_attrib,
 845                                 struct kobject *kobj, int count)
 846 {
 847         struct mcidev_sysfs_group_kobj *grp_kobj, *tmp;
 848
 849         debugf1("%s()\n", __func__);
 850
 851         /*
 852          * loop if there are attributes and until we hit a NULL entry
 853          * Remove first all the atributes
 854          */
 855         while (sysfs_attrib) {
 856                 debugf1("%s() sysfs_attrib = %p\n",__func__, sysfs_attrib);
 857                 if (sysfs_attrib->grp) {
 858                         debugf1("%s() seeking for group %s\n",
 859                                 __func__, sysfs_attrib->grp->name);
 860                         list_for_each_entry(grp_kobj,
 861                                             &mci->grp_kobj_list, list) {
 862                                 debugf1("%s() grp_kobj->grp = %p\n",__func__, grp_kobj->grp);
 863                                 if (grp_kobj->grp == sysfs_attrib->grp) {
 864                                         edac_remove_mci_instance_attributes(mci,
 865                                                     grp_kobj->grp->mcidev_attr,
 866                                                     &grp_kobj->kobj, count + 1);
 867                                         debugf0("%s() group %s\n", __func__,
 868                                                 sysfs_attrib->grp->name);
 869                                         kobject_put(&grp_kobj->kobj);
 870                                 }
 871                         }
 872                         debugf1("%s() end of seeking for group %s\n",
 873                                 __func__, sysfs_attrib->grp->name);
 874                 } else if (sysfs_attrib->attr.name) {
 875                         debugf0("%s() file %s\n", __func__,
 876                                 sysfs_attrib->attr.name);
 877                         sysfs_remove_file(kobj, &sysfs_attrib->attr);
 878                 } else
 879                         break;
 880                 sysfs_attrib++;
 881         }
 882
 883         /* Remove the group objects */
 884         if (count)
 885                 return;
 886         list_for_each_entry_safe(grp_kobj, tmp,
 887                                  &mci->grp_kobj_list, list) {
 888                 list_del(&grp_kobj->list);
 889                 kfree(grp_kobj);
 890         }
 891 }
 892
 893
 894 /*
 895  * Create a new Memory Controller kobject instance,
 896  *      mc<id> under the 'mc' directory
 897  *
 898  * Return:
 899  *      0       Success
 900  *      !0      Failure
 901  */
 902 int edac_create_sysfs_mci_device(struct mem_ctl_info *mci)
 903 {
 904         int i;
 905         int err;
 906         struct csrow_info *csrow;
 907         struct kobject *kobj_mci = &mci->edac_mci_kobj;
 908
 909         debugf0("%s() idx=%d\n", __func__, mci->mc_idx);
 910
 911         INIT_LIST_HEAD(&mci->grp_kobj_list);
 912
 913         /* create a symlink for the device */
 914         err = sysfs_create_link(kobj_mci, &mci->dev->kobj,
 915                                 EDAC_DEVICE_SYMLINK);
 916         if (err) {
 917                 debugf1("%s() failure to create symlink\n", __func__);
 918                 goto fail0;
 919         }
 920
 921         /* If the low level driver desires some attributes,
 922          * then create them now for the driver.
 923          */
 924         if (mci->mc_driver_sysfs_attributes) {
 925                 err = edac_create_mci_instance_attributes(mci,
 926                                         mci->mc_driver_sysfs_attributes,
 927                                         &mci->edac_mci_kobj);
 928                 if (err) {
 929                         debugf1("%s() failure to create mci attributes\n",
 930                                 __func__);
 931                         goto fail0;
 932                 }
 933         }
 934
 935         /* Make directories for each CSROW object under the mc<id> kobject
 936          */
 937         for (i = 0; i < mci->nr_csrows; i++) {
 938                 csrow = &mci->csrows[i];
 939
 940                 /* Only expose populated CSROWs */
 941                 if (csrow->nr_pages > 0) {
 942                         err = edac_create_csrow_object(mci, csrow, i);
 943                         if (err) {
 944                                 debugf1("%s() failure: create csrow %d obj\n",
 945                                         __func__, i);
 946                                 goto fail1;
 947                         }
 948                 }
 949         }
 950
 951         return 0;
 952
 953         /* CSROW error: backout what has already been registered,  */
 954 fail1:
 955         for (i--; i >= 0; i--) {
 956                 if (csrow->nr_pages > 0) {
 957                         kobject_put(&mci->csrows[i].kobj);
 958                 }
 959         }
 960
 961         /* remove the mci instance's attributes, if any */
 962         edac_remove_mci_instance_attributes(mci,
 963                 mci->mc_driver_sysfs_attributes, &mci->edac_mci_kobj, 0);
 964
 965         /* remove the symlink */
 966         sysfs_remove_link(kobj_mci, EDAC_DEVICE_SYMLINK);
 967
 968 fail0:
 969         return err;
 970 }
 971
 972 /*
 973  * remove a Memory Controller instance
 974  */
 975 void edac_remove_sysfs_mci_device(struct mem_ctl_info *mci)
 976 {
 977         int i;
 978
 979         debugf0("%s()\n", __func__);
 980
 981         /* remove all csrow kobjects */
 982         debugf0("%s()  unregister this mci kobj\n", __func__);
 983         for (i = 0; i < mci->nr_csrows; i++) {
 984                 if (mci->csrows[i].nr_pages > 0) {
 985                         debugf0("%s()  unreg csrow-%d\n", __func__, i);
 986                         kobject_put(&mci->csrows[i].kobj);
 987                 }
 988         }
 989
 990         /* remove this mci instance's attribtes */
 991         if (mci->mc_driver_sysfs_attributes) {
 992                 debugf0("%s()  unregister mci private attributes\n", __func__);
 993                 edac_remove_mci_instance_attributes(mci,
 994                                                 mci->mc_driver_sysfs_attributes,
 995                                                 &mci->edac_mci_kobj, 0);
 996         }
 997
 998         /* remove the symlink */
 999         debugf0("%s()  remove_link\n", __func__);
1000         sysfs_remove_link(&mci->edac_mci_kobj, EDAC_DEVICE_SYMLINK);
1001
1002         /* unregister this instance's kobject */
1003         debugf0("%s()  remove_mci_instance\n", __func__);
1004         kobject_put(&mci->edac_mci_kobj);
1005 }
1006
1007
1008
1009
1010 /*
1011  * edac_setup_sysfs_mc_kset(void)
1012  *
1013  * Initialize the mc_kset for the 'mc' entry
1014  *      This requires creating the top 'mc' directory with a kset
1015  *      and its controls/attributes.
1016  *
1017  *      To this 'mc' kset, instance 'mci' will be grouped as children.
1018  *
1019  * Return:  0 SUCCESS
1020  *         !0 FAILURE error code
1021  */
1022 int edac_sysfs_setup_mc_kset(void)
1023 {
1024         int err = -EINVAL;
1025         struct sysdev_class *edac_class;
1026
1027         debugf1("%s()\n", __func__);
1028
1029         /* get the /sys/devices/system/edac class reference */
1030         edac_class = edac_get_sysfs_class();
1031         if (edac_class == NULL) {
1032                 debugf1("%s() no edac_class error=%d\n", __func__, err);
1033                 goto fail_out;
1034         }
1035
1036         /* Init the MC's kobject */
1037         mc_kset = kset_create_and_add("mc", NULL, &edac_class->kset.kobj);
1038         if (!mc_kset) {
1039                 err = -ENOMEM;
1040                 debugf1("%s() Failed to register '.../edac/mc'\n", __func__);
1041                 goto fail_kset;
1042         }
1043
1044         debugf1("%s() Registered '.../edac/mc' kobject\n", __func__);
1045
1046         return 0;
1047
1048 fail_kset:
1049         edac_put_sysfs_class();
1050
1051 fail_out:
1052         return err;
1053 }
1054
1055 /*
1056  * edac_sysfs_teardown_mc_kset
1057  *
1058  *      deconstruct the mc_ket for memory controllers
1059  */
1060 void edac_sysfs_teardown_mc_kset(void)
1061 {
1062         kset_unregister(mc_kset);
1063         edac_put_sysfs_class();
1064 }
1065