drivers/edac/edac_mc_sysfs.c

   1 /*
   2  * edac_mc kernel module
   3  * (C) 2005-2007 Linux Networx (http://lnxi.com)
   4  *
   5  * This file may be distributed under the terms of the
   6  * GNU General Public License.
   7  *
   8  * Written Doug Thompson <norsk5@xmission.com> www.softwarebitmaker.com
   9  *
  10  */
  11
  12 #include <linux/ctype.h>
  13 #include <linux/bug.h>
  14
  15 #include "edac_core.h"
  16 #include "edac_module.h"
  17
  18
  19 /* MC EDAC Controls, setable by module parameter, and sysfs */
  20 static int edac_mc_log_ue = 1;
  21 static int edac_mc_log_ce = 1;
  22 static int edac_mc_panic_on_ue;
  23 static int edac_mc_poll_msec = 1000;
  24
  25 /* Getter functions for above */
  26 int edac_mc_get_log_ue(void)
  27 {
  28         return edac_mc_log_ue;
  29 }
  30
  31 int edac_mc_get_log_ce(void)
  32 {
  33         return edac_mc_log_ce;
  34 }
  35
  36 int edac_mc_get_panic_on_ue(void)
  37 {
  38         return edac_mc_panic_on_ue;
  39 }
  40
  41 /* this is temporary */
  42 int edac_mc_get_poll_msec(void)
  43 {
  44         return edac_mc_poll_msec;
  45 }
  46
  47 static int edac_set_poll_msec(const char *val, struct kernel_param *kp)
  48 {
  49         long l;
  50         int ret;
  51
  52         if (!val)
  53                 return -EINVAL;
  54
  55         ret = strict_strtol(val, 0, &l);
  56         if (ret == -EINVAL || ((int)l != l))
  57                 return -EINVAL;
  58         *((int *)kp->arg) = l;
  59
  60         /* notify edac_mc engine to reset the poll period */
  61         edac_mc_reset_delay_period(l);
  62
  63         return 0;
  64 }
  65
  66 /* Parameter declarations for above */
  67 module_param(edac_mc_panic_on_ue, int, 0644);
  68 MODULE_PARM_DESC(edac_mc_panic_on_ue, "Panic on uncorrected error: 0=off 1=on");
  69 module_param(edac_mc_log_ue, int, 0644);
  70 MODULE_PARM_DESC(edac_mc_log_ue,
  71                  "Log uncorrectable error to console: 0=off 1=on");
  72 module_param(edac_mc_log_ce, int, 0644);
  73 MODULE_PARM_DESC(edac_mc_log_ce,
  74                  "Log correctable error to console: 0=off 1=on");
  75 module_param_call(edac_mc_poll_msec, edac_set_poll_msec, param_get_int,
  76                   &edac_mc_poll_msec, 0644);
  77 MODULE_PARM_DESC(edac_mc_poll_msec, "Polling period in milliseconds");
  78
  79 /*
  80  * various constants for Memory Controllers
  81  */
  82 static const char *mem_types[] = {
  83         [MEM_EMPTY] = "Empty",
  84         [MEM_RESERVED] = "Reserved",
  85         [MEM_UNKNOWN] = "Unknown",
  86         [MEM_FPM] = "FPM",
  87         [MEM_EDO] = "EDO",
  88         [MEM_BEDO] = "BEDO",
  89         [MEM_SDR] = "Unbuffered-SDR",
  90         [MEM_RDR] = "Registered-SDR",
  91         [MEM_DDR] = "Unbuffered-DDR",
  92         [MEM_RDDR] = "Registered-DDR",
  93         [MEM_RMBS] = "RMBS",
  94         [MEM_DDR2] = "Unbuffered-DDR2",
  95         [MEM_FB_DDR2] = "FullyBuffered-DDR2",
  96         [MEM_RDDR2] = "Registered-DDR2",
  97         [MEM_XDR] = "XDR"
  98 };
  99
 100 static const char *dev_types[] = {
 101         [DEV_UNKNOWN] = "Unknown",
 102         [DEV_X1] = "x1",
 103         [DEV_X2] = "x2",
 104         [DEV_X4] = "x4",
 105         [DEV_X8] = "x8",
 106         [DEV_X16] = "x16",
 107         [DEV_X32] = "x32",
 108         [DEV_X64] = "x64"
 109 };
 110
 111 static const char *edac_caps[] = {
 112         [EDAC_UNKNOWN] = "Unknown",
 113         [EDAC_NONE] = "None",
 114         [EDAC_RESERVED] = "Reserved",
 115         [EDAC_PARITY] = "PARITY",
 116         [EDAC_EC] = "EC",
 117         [EDAC_SECDED] = "SECDED",
 118         [EDAC_S2ECD2ED] = "S2ECD2ED",
 119         [EDAC_S4ECD4ED] = "S4ECD4ED",
 120         [EDAC_S8ECD8ED] = "S8ECD8ED",
 121         [EDAC_S16ECD16ED] = "S16ECD16ED"
 122 };
 123
 124
 125
 126 /*
 127  * /sys/devices/system/edac/mc;
 128  *      data structures and methods
 129  */
 130 static ssize_t memctrl_int_show(void *ptr, char *buffer)
 131 {
 132         int *value = (int *)ptr;
 133         return sprintf(buffer, "%u\n", *value);
 134 }
 135
 136 static ssize_t memctrl_int_store(void *ptr, const char *buffer, size_t count)
 137 {
 138         int *value = (int *)ptr;
 139
 140         if (isdigit(*buffer))
 141                 *value = simple_strtoul(buffer, NULL, 0);
 142
 143         return count;
 144 }
 145
 146 /*
 147  * mc poll_msec time value
 148  */
 149 static ssize_t poll_msec_int_store(void *ptr, const char *buffer, size_t count)
 150 {
 151         int *value = (int *)ptr;
 152
 153         if (isdigit(*buffer)) {
 154                 *value = simple_strtoul(buffer, NULL, 0);
 155
 156                 /* notify edac_mc engine to reset the poll period */
 157                 edac_mc_reset_delay_period(*value);
 158         }
 159
 160         return count;
 161 }
 162
 163
 164 /* EDAC sysfs CSROW data structures and methods
 165  */
 166
 167 /* Set of more default csrow<id> attribute show/store functions */
 168 static ssize_t csrow_ue_count_show(struct csrow_info *csrow, char *data,
 169                                 int private)
 170 {
 171         return sprintf(data, "%u\n", csrow->ue_count);
 172 }
 173
 174 static ssize_t csrow_ce_count_show(struct csrow_info *csrow, char *data,
 175                                 int private)
 176 {
 177         return sprintf(data, "%u\n", csrow->ce_count);
 178 }
 179
 180 static ssize_t csrow_size_show(struct csrow_info *csrow, char *data,
 181                                 int private)
 182 {
 183         return sprintf(data, "%u\n", PAGES_TO_MiB(csrow->nr_pages));
 184 }
 185
 186 static ssize_t csrow_mem_type_show(struct csrow_info *csrow, char *data,
 187                                 int private)
 188 {
 189         return sprintf(data, "%s\n", mem_types[csrow->mtype]);
 190 }
 191
 192 static ssize_t csrow_dev_type_show(struct csrow_info *csrow, char *data,
 193                                 int private)
 194 {
 195         return sprintf(data, "%s\n", dev_types[csrow->dtype]);
 196 }
 197
 198 static ssize_t csrow_edac_mode_show(struct csrow_info *csrow, char *data,
 199                                 int private)
 200 {
 201         return sprintf(data, "%s\n", edac_caps[csrow->edac_mode]);
 202 }
 203
 204 /* show/store functions for DIMM Label attributes */
 205 static ssize_t channel_dimm_label_show(struct csrow_info *csrow,
 206                                 char *data, int channel)
 207 {
 208         return snprintf(data, EDAC_MC_LABEL_LEN, "%s",
 209                         csrow->channels[channel].label);
 210 }
 211
 212 static ssize_t channel_dimm_label_store(struct csrow_info *csrow,
 213                                         const char *data,
 214                                         size_t count, int channel)
 215 {
 216         ssize_t max_size = 0;
 217
 218         max_size = min((ssize_t) count, (ssize_t) EDAC_MC_LABEL_LEN - 1);
 219         strncpy(csrow->channels[channel].label, data, max_size);
 220         csrow->channels[channel].label[max_size] = '\0';
 221
 222         return max_size;
 223 }
 224
 225 /* show function for dynamic chX_ce_count attribute */
 226 static ssize_t channel_ce_count_show(struct csrow_info *csrow,
 227                                 char *data, int channel)
 228 {
 229         return sprintf(data, "%u\n", csrow->channels[channel].ce_count);
 230 }
 231
 232 /* csrow specific attribute structure */
 233 struct csrowdev_attribute {
 234         struct attribute attr;
 235          ssize_t(*show) (struct csrow_info *, char *, int);
 236          ssize_t(*store) (struct csrow_info *, const char *, size_t, int);
 237         int private;
 238 };
 239
 240 #define to_csrow(k) container_of(k, struct csrow_info, kobj)
 241 #define to_csrowdev_attr(a) container_of(a, struct csrowdev_attribute, attr)
 242
 243 /* Set of show/store higher level functions for default csrow attributes */
 244 static ssize_t csrowdev_show(struct kobject *kobj,
 245                         struct attribute *attr, char *buffer)
 246 {
 247         struct csrow_info *csrow = to_csrow(kobj);
 248         struct csrowdev_attribute *csrowdev_attr = to_csrowdev_attr(attr);
 249
 250         if (csrowdev_attr->show)
 251                 return csrowdev_attr->show(csrow,
 252                                         buffer, csrowdev_attr->private);
 253         return -EIO;
 254 }
 255
 256 static ssize_t csrowdev_store(struct kobject *kobj, struct attribute *attr,
 257                         const char *buffer, size_t count)
 258 {
 259         struct csrow_info *csrow = to_csrow(kobj);
 260         struct csrowdev_attribute *csrowdev_attr = to_csrowdev_attr(attr);
 261
 262         if (csrowdev_attr->store)
 263                 return csrowdev_attr->store(csrow,
 264                                         buffer,
 265                                         count, csrowdev_attr->private);
 266         return -EIO;
 267 }
 268
 269 static struct sysfs_ops csrowfs_ops = {
 270         .show = csrowdev_show,
 271         .store = csrowdev_store
 272 };
 273
 274 #define CSROWDEV_ATTR(_name,_mode,_show,_store,_private)        \
 275 static struct csrowdev_attribute attr_##_name = {                       \
 276         .attr = {.name = __stringify(_name), .mode = _mode },   \
 277         .show   = _show,                                        \
 278         .store  = _store,                                       \
 279         .private = _private,                                    \
 280 };
 281
 282 /* default cwrow<id>/attribute files */
 283 CSROWDEV_ATTR(size_mb, S_IRUGO, csrow_size_show, NULL, 0);
 284 CSROWDEV_ATTR(dev_type, S_IRUGO, csrow_dev_type_show, NULL, 0);
 285 CSROWDEV_ATTR(mem_type, S_IRUGO, csrow_mem_type_show, NULL, 0);
 286 CSROWDEV_ATTR(edac_mode, S_IRUGO, csrow_edac_mode_show, NULL, 0);
 287 CSROWDEV_ATTR(ue_count, S_IRUGO, csrow_ue_count_show, NULL, 0);
 288 CSROWDEV_ATTR(ce_count, S_IRUGO, csrow_ce_count_show, NULL, 0);
 289
 290 /* default attributes of the CSROW<id> object */
 291 static struct csrowdev_attribute *default_csrow_attr[] = {
 292         &attr_dev_type,
 293         &attr_mem_type,
 294         &attr_edac_mode,
 295         &attr_size_mb,
 296         &attr_ue_count,
 297         &attr_ce_count,
 298         NULL,
 299 };
 300
 301 /* possible dynamic channel DIMM Label attribute files */
 302 CSROWDEV_ATTR(ch0_dimm_label, S_IRUGO | S_IWUSR,
 303         channel_dimm_label_show, channel_dimm_label_store, 0);
 304 CSROWDEV_ATTR(ch1_dimm_label, S_IRUGO | S_IWUSR,
 305         channel_dimm_label_show, channel_dimm_label_store, 1);
 306 CSROWDEV_ATTR(ch2_dimm_label, S_IRUGO | S_IWUSR,
 307         channel_dimm_label_show, channel_dimm_label_store, 2);
 308 CSROWDEV_ATTR(ch3_dimm_label, S_IRUGO | S_IWUSR,
 309         channel_dimm_label_show, channel_dimm_label_store, 3);
 310 CSROWDEV_ATTR(ch4_dimm_label, S_IRUGO | S_IWUSR,
 311         channel_dimm_label_show, channel_dimm_label_store, 4);
 312 CSROWDEV_ATTR(ch5_dimm_label, S_IRUGO | S_IWUSR,
 313         channel_dimm_label_show, channel_dimm_label_store, 5);
 314
 315 /* Total possible dynamic DIMM Label attribute file table */
 316 static struct csrowdev_attribute *dynamic_csrow_dimm_attr[] = {
 317         &attr_ch0_dimm_label,
 318         &attr_ch1_dimm_label,
 319         &attr_ch2_dimm_label,
 320         &attr_ch3_dimm_label,
 321         &attr_ch4_dimm_label,
 322         &attr_ch5_dimm_label
 323 };
 324
 325 /* possible dynamic channel ce_count attribute files */
 326 CSROWDEV_ATTR(ch0_ce_count, S_IRUGO | S_IWUSR, channel_ce_count_show, NULL, 0);
 327 CSROWDEV_ATTR(ch1_ce_count, S_IRUGO | S_IWUSR, channel_ce_count_show, NULL, 1);
 328 CSROWDEV_ATTR(ch2_ce_count, S_IRUGO | S_IWUSR, channel_ce_count_show, NULL, 2);
 329 CSROWDEV_ATTR(ch3_ce_count, S_IRUGO | S_IWUSR, channel_ce_count_show, NULL, 3);
 330 CSROWDEV_ATTR(ch4_ce_count, S_IRUGO | S_IWUSR, channel_ce_count_show, NULL, 4);
 331 CSROWDEV_ATTR(ch5_ce_count, S_IRUGO | S_IWUSR, channel_ce_count_show, NULL, 5);
 332
 333 /* Total possible dynamic ce_count attribute file table */
 334 static struct csrowdev_attribute *dynamic_csrow_ce_count_attr[] = {
 335         &attr_ch0_ce_count,
 336         &attr_ch1_ce_count,
 337         &attr_ch2_ce_count,
 338         &attr_ch3_ce_count,
 339         &attr_ch4_ce_count,
 340         &attr_ch5_ce_count
 341 };
 342
 343 #define EDAC_NR_CHANNELS        6
 344
 345 /* Create dynamic CHANNEL files, indexed by 'chan',  under specifed CSROW */
 346 static int edac_create_channel_files(struct kobject *kobj, int chan)
 347 {
 348         int err = -ENODEV;
 349
 350         if (chan >= EDAC_NR_CHANNELS)
 351                 return err;
 352
 353         /* create the DIMM label attribute file */
 354         err = sysfs_create_file(kobj,
 355                                 (struct attribute *)
 356                                 dynamic_csrow_dimm_attr[chan]);
 357
 358         if (!err) {
 359                 /* create the CE Count attribute file */
 360                 err = sysfs_create_file(kobj,
 361                                         (struct attribute *)
 362                                         dynamic_csrow_ce_count_attr[chan]);
 363         } else {
 364                 debugf1("%s()  dimm labels and ce_count files created",
 365                         __func__);
 366         }
 367
 368         return err;
 369 }
 370
 371 /* No memory to release for this kobj */
 372 static void edac_csrow_instance_release(struct kobject *kobj)
 373 {
 374         struct mem_ctl_info *mci;
 375         struct csrow_info *cs;
 376
 377         debugf1("%s()\n", __func__);
 378
 379         cs = container_of(kobj, struct csrow_info, kobj);
 380         mci = cs->mci;
 381
 382         kobject_put(&mci->edac_mci_kobj);
 383 }
 384
 385 /* the kobj_type instance for a CSROW */
 386 static struct kobj_type ktype_csrow = {
 387         .release = edac_csrow_instance_release,
 388         .sysfs_ops = &csrowfs_ops,
 389         .default_attrs = (struct attribute **)default_csrow_attr,
 390 };
 391
 392 /* Create a CSROW object under specifed edac_mc_device */
 393 static int edac_create_csrow_object(struct mem_ctl_info *mci,
 394                                         struct csrow_info *csrow, int index)
 395 {
 396         struct kobject *kobj_mci = &mci->edac_mci_kobj;
 397         struct kobject *kobj;
 398         int chan;
 399         int err;
 400
 401         /* generate ..../edac/mc/mc<id>/csrow<index>   */
 402         memset(&csrow->kobj, 0, sizeof(csrow->kobj));
 403         csrow->mci = mci;       /* include container up link */
 404
 405         /* bump the mci instance's kobject's ref count */
 406         kobj = kobject_get(&mci->edac_mci_kobj);
 407         if (!kobj) {
 408                 err = -ENODEV;
 409                 goto err_out;
 410         }
 411
 412         /* Instanstiate the csrow object */
 413         err = kobject_init_and_add(&csrow->kobj, &ktype_csrow, kobj_mci,
 414                                    "csrow%d", index);
 415         if (err)
 416                 goto err_release_top_kobj;
 417
 418         /* At this point, to release a csrow kobj, one must
 419          * call the kobject_put and allow that tear down
 420          * to work the releasing
 421          */
 422
 423         /* Create the dyanmic attribute files on this csrow,
 424          * namely, the DIMM labels and the channel ce_count
 425          */
 426         for (chan = 0; chan < csrow->nr_channels; chan++) {
 427                 err = edac_create_channel_files(&csrow->kobj, chan);
 428                 if (err) {
 429                         /* special case the unregister here */
 430                         kobject_put(&csrow->kobj);
 431                         goto err_out;
 432                 }
 433         }
 434         kobject_uevent(&csrow->kobj, KOBJ_ADD);
 435         return 0;
 436
 437         /* error unwind stack */
 438 err_release_top_kobj:
 439         kobject_put(&mci->edac_mci_kobj);
 440
 441 err_out:
 442         return err;
 443 }
 444
 445 /* default sysfs methods and data structures for the main MCI kobject */
 446
 447 static ssize_t mci_reset_counters_store(struct mem_ctl_info *mci,
 448                                         const char *data, size_t count)
 449 {
 450         int row, chan;
 451
 452         mci->ue_noinfo_count = 0;
 453         mci->ce_noinfo_count = 0;
 454         mci->ue_count = 0;
 455         mci->ce_count = 0;
 456
 457         for (row = 0; row < mci->nr_csrows; row++) {
 458                 struct csrow_info *ri = &mci->csrows[row];
 459
 460                 ri->ue_count = 0;
 461                 ri->ce_count = 0;
 462
 463                 for (chan = 0; chan < ri->nr_channels; chan++)
 464                         ri->channels[chan].ce_count = 0;
 465         }
 466
 467         mci->start_time = jiffies;
 468         return count;
 469 }
 470
 471 /* memory scrubbing */
 472 static ssize_t mci_sdram_scrub_rate_store(struct mem_ctl_info *mci,
 473                                         const char *data, size_t count)
 474 {
 475         u32 bandwidth = -1;
 476
 477         if (mci->set_sdram_scrub_rate) {
 478
 479                 memctrl_int_store(&bandwidth, data, count);
 480
 481                 if (!(*mci->set_sdram_scrub_rate) (mci, &bandwidth)) {
 482                         edac_printk(KERN_DEBUG, EDAC_MC,
 483                                 "Scrub rate set successfully, applied: %d\n",
 484                                 bandwidth);
 485                 } else {
 486                         /* FIXME: error codes maybe? */
 487                         edac_printk(KERN_DEBUG, EDAC_MC,
 488                                 "Scrub rate set FAILED, could not apply: %d\n",
 489                                 bandwidth);
 490                 }
 491         } else {
 492                 /* FIXME: produce "not implemented" ERROR for user-side. */
 493                 edac_printk(KERN_WARNING, EDAC_MC,
 494                         "Memory scrubbing 'set'control is not implemented!\n");
 495         }
 496         return count;
 497 }
 498
 499 static ssize_t mci_sdram_scrub_rate_show(struct mem_ctl_info *mci, char *data)
 500 {
 501         u32 bandwidth = -1;
 502
 503         if (mci->get_sdram_scrub_rate) {
 504                 if (!(*mci->get_sdram_scrub_rate) (mci, &bandwidth)) {
 505                         edac_printk(KERN_DEBUG, EDAC_MC,
 506                                 "Scrub rate successfully, fetched: %d\n",
 507                                 bandwidth);
 508                 } else {
 509                         /* FIXME: error codes maybe? */
 510                         edac_printk(KERN_DEBUG, EDAC_MC,
 511                                 "Scrub rate fetch FAILED, got: %d\n",
 512                                 bandwidth);
 513                 }
 514         } else {
 515                 /* FIXME: produce "not implemented" ERROR for user-side.  */
 516                 edac_printk(KERN_WARNING, EDAC_MC,
 517                         "Memory scrubbing 'get' control is not implemented\n");
 518         }
 519         return sprintf(data, "%d\n", bandwidth);
 520 }
 521
 522 /* default attribute files for the MCI object */
 523 static ssize_t mci_ue_count_show(struct mem_ctl_info *mci, char *data)
 524 {
 525         return sprintf(data, "%d\n", mci->ue_count);
 526 }
 527
 528 static ssize_t mci_ce_count_show(struct mem_ctl_info *mci, char *data)
 529 {
 530         return sprintf(data, "%d\n", mci->ce_count);
 531 }
 532
 533 static ssize_t mci_ce_noinfo_show(struct mem_ctl_info *mci, char *data)
 534 {
 535         return sprintf(data, "%d\n", mci->ce_noinfo_count);
 536 }
 537
 538 static ssize_t mci_ue_noinfo_show(struct mem_ctl_info *mci, char *data)
 539 {
 540         return sprintf(data, "%d\n", mci->ue_noinfo_count);
 541 }
 542
 543 static ssize_t mci_seconds_show(struct mem_ctl_info *mci, char *data)
 544 {
 545         return sprintf(data, "%ld\n", (jiffies - mci->start_time) / HZ);
 546 }
 547
 548 static ssize_t mci_ctl_name_show(struct mem_ctl_info *mci, char *data)
 549 {
 550         return sprintf(data, "%s\n", mci->ctl_name);
 551 }
 552
 553 static ssize_t mci_size_mb_show(struct mem_ctl_info *mci, char *data)
 554 {
 555         int total_pages, csrow_idx;
 556
 557         for (total_pages = csrow_idx = 0; csrow_idx < mci->nr_csrows;
 558                 csrow_idx++) {
 559                 struct csrow_info *csrow = &mci->csrows[csrow_idx];
 560
 561                 if (!csrow->nr_pages)
 562                         continue;
 563
 564                 total_pages += csrow->nr_pages;
 565         }
 566
 567         return sprintf(data, "%u\n", PAGES_TO_MiB(total_pages));
 568 }
 569
 570 #define to_mci(k) container_of(k, struct mem_ctl_info, edac_mci_kobj)
 571 #define to_mcidev_attr(a) container_of(a,struct mcidev_sysfs_attribute,attr)
 572
 573 /* MCI show/store functions for top most object */
 574 static ssize_t mcidev_show(struct kobject *kobj, struct attribute *attr,
 575                         char *buffer)
 576 {
 577         struct mem_ctl_info *mem_ctl_info = to_mci(kobj);
 578         struct mcidev_sysfs_attribute *mcidev_attr = to_mcidev_attr(attr);
 579
 580         if (mcidev_attr->show)
 581                 return mcidev_attr->show(mem_ctl_info, buffer);
 582
 583         return -EIO;
 584 }
 585
 586 static ssize_t mcidev_store(struct kobject *kobj, struct attribute *attr,
 587                         const char *buffer, size_t count)
 588 {
 589         struct mem_ctl_info *mem_ctl_info = to_mci(kobj);
 590         struct mcidev_sysfs_attribute *mcidev_attr = to_mcidev_attr(attr);
 591
 592         if (mcidev_attr->store)
 593                 return mcidev_attr->store(mem_ctl_info, buffer, count);
 594
 595         return -EIO;
 596 }
 597
 598 /* Intermediate show/store table */
 599 static struct sysfs_ops mci_ops = {
 600         .show = mcidev_show,
 601         .store = mcidev_store
 602 };
 603
 604 #define MCIDEV_ATTR(_name,_mode,_show,_store)                   \
 605 static struct mcidev_sysfs_attribute mci_attr_##_name = {                       \
 606         .attr = {.name = __stringify(_name), .mode = _mode },   \
 607         .show   = _show,                                        \
 608         .store  = _store,                                       \
 609 };
 610
 611 /* default Control file */
 612 MCIDEV_ATTR(reset_counters, S_IWUSR, NULL, mci_reset_counters_store);
 613
 614 /* default Attribute files */
 615 MCIDEV_ATTR(mc_name, S_IRUGO, mci_ctl_name_show, NULL);
 616 MCIDEV_ATTR(size_mb, S_IRUGO, mci_size_mb_show, NULL);
 617 MCIDEV_ATTR(seconds_since_reset, S_IRUGO, mci_seconds_show, NULL);
 618 MCIDEV_ATTR(ue_noinfo_count, S_IRUGO, mci_ue_noinfo_show, NULL);
 619 MCIDEV_ATTR(ce_noinfo_count, S_IRUGO, mci_ce_noinfo_show, NULL);
 620 MCIDEV_ATTR(ue_count, S_IRUGO, mci_ue_count_show, NULL);
 621 MCIDEV_ATTR(ce_count, S_IRUGO, mci_ce_count_show, NULL);
 622
 623 /* memory scrubber attribute file */
 624 MCIDEV_ATTR(sdram_scrub_rate, S_IRUGO | S_IWUSR, mci_sdram_scrub_rate_show,
 625         mci_sdram_scrub_rate_store);
 626
 627 static struct mcidev_sysfs_attribute *mci_attr[] = {
 628         &mci_attr_reset_counters,
 629         &mci_attr_mc_name,
 630         &mci_attr_size_mb,
 631         &mci_attr_seconds_since_reset,
 632         &mci_attr_ue_noinfo_count,
 633         &mci_attr_ce_noinfo_count,
 634         &mci_attr_ue_count,
 635         &mci_attr_ce_count,
 636         &mci_attr_sdram_scrub_rate,
 637         NULL
 638 };
 639
 640
 641 /*
 642  * Release of a MC controlling instance
 643  *
 644  *      each MC control instance has the following resources upon entry:
 645  *              a) a ref count on the top memctl kobj
 646  *              b) a ref count on this module
 647  *
 648  *      this function must decrement those ref counts and then
 649  *      issue a free on the instance's memory
 650  */
 651 static void edac_mci_control_release(struct kobject *kobj)
 652 {
 653         struct mem_ctl_info *mci;
 654
 655         mci = to_mci(kobj);
 656
 657         debugf0("%s() mci instance idx=%d releasing\n", __func__, mci->mc_idx);
 658
 659         /* decrement the module ref count */
 660         module_put(mci->owner);
 661
 662         /* free the mci instance memory here */
 663         kfree(mci);
 664 }
 665
 666 static struct kobj_type ktype_mci = {
 667         .release = edac_mci_control_release,
 668         .sysfs_ops = &mci_ops,
 669         .default_attrs = (struct attribute **)mci_attr,
 670 };
 671
 672 /* show/store, tables, etc for the MC kset */
 673
 674
 675 struct memctrl_dev_attribute {
 676         struct attribute attr;
 677         void *value;
 678          ssize_t(*show) (void *, char *);
 679          ssize_t(*store) (void *, const char *, size_t);
 680 };
 681
 682 /* Set of show/store abstract level functions for memory control object */
 683 static ssize_t memctrl_dev_show(struct kobject *kobj,
 684                                 struct attribute *attr, char *buffer)
 685 {
 686         struct memctrl_dev_attribute *memctrl_dev;
 687         memctrl_dev = (struct memctrl_dev_attribute *)attr;
 688
 689         if (memctrl_dev->show)
 690                 return memctrl_dev->show(memctrl_dev->value, buffer);
 691
 692         return -EIO;
 693 }
 694
 695 static ssize_t memctrl_dev_store(struct kobject *kobj, struct attribute *attr,
 696                                  const char *buffer, size_t count)
 697 {
 698         struct memctrl_dev_attribute *memctrl_dev;
 699         memctrl_dev = (struct memctrl_dev_attribute *)attr;
 700
 701         if (memctrl_dev->store)
 702                 return memctrl_dev->store(memctrl_dev->value, buffer, count);
 703
 704         return -EIO;
 705 }
 706
 707 static struct sysfs_ops memctrlfs_ops = {
 708         .show = memctrl_dev_show,
 709         .store = memctrl_dev_store
 710 };
 711
 712 #define MEMCTRL_ATTR(_name, _mode, _show, _store)                       \
 713 static struct memctrl_dev_attribute attr_##_name = {                    \
 714         .attr = {.name = __stringify(_name), .mode = _mode },   \
 715         .value  = &_name,                                       \
 716         .show   = _show,                                        \
 717         .store  = _store,                                       \
 718 };
 719
 720 #define MEMCTRL_STRING_ATTR(_name, _data, _mode, _show, _store) \
 721 static struct memctrl_dev_attribute attr_##_name = {                    \
 722         .attr = {.name = __stringify(_name), .mode = _mode },   \
 723         .value  = _data,                                        \
 724         .show   = _show,                                        \
 725         .store  = _store,                                       \
 726 };
 727
 728 /* csrow<id> control files */
 729 MEMCTRL_ATTR(edac_mc_panic_on_ue,
 730         S_IRUGO | S_IWUSR, memctrl_int_show, memctrl_int_store);
 731
 732 MEMCTRL_ATTR(edac_mc_log_ue,
 733         S_IRUGO | S_IWUSR, memctrl_int_show, memctrl_int_store);
 734
 735 MEMCTRL_ATTR(edac_mc_log_ce,
 736         S_IRUGO | S_IWUSR, memctrl_int_show, memctrl_int_store);
 737
 738 MEMCTRL_ATTR(edac_mc_poll_msec,
 739         S_IRUGO | S_IWUSR, memctrl_int_show, poll_msec_int_store);
 740
 741 /* Base Attributes of the memory ECC object */
 742 static struct memctrl_dev_attribute *memctrl_attr[] = {
 743         &attr_edac_mc_panic_on_ue,
 744         &attr_edac_mc_log_ue,
 745         &attr_edac_mc_log_ce,
 746         &attr_edac_mc_poll_msec,
 747         NULL,
 748 };
 749
 750
 751 /* the ktype for the mc_kset internal kobj */
 752 static struct kobj_type ktype_mc_set_attribs = {
 753         .sysfs_ops = &memctrlfs_ops,
 754         .default_attrs = (struct attribute **)memctrl_attr,
 755 };
 756
 757 /* EDAC memory controller sysfs kset:
 758  *      /sys/devices/system/edac/mc
 759  */
 760 static struct kset mc_kset = {
 761         .kobj = {.ktype = &ktype_mc_set_attribs },
 762 };
 763
 764
 765 /*
 766  * edac_mc_register_sysfs_main_kobj
 767  *
 768  *      setups and registers the main kobject for each mci
 769  */
 770 int edac_mc_register_sysfs_main_kobj(struct mem_ctl_info *mci)
 771 {
 772         struct kobject *kobj_mci;
 773         int err;
 774
 775         debugf1("%s()\n", __func__);
 776
 777         kobj_mci = &mci->edac_mci_kobj;
 778
 779         /* Init the mci's kobject */
 780         memset(kobj_mci, 0, sizeof(*kobj_mci));
 781
 782         /* Record which module 'owns' this control structure
 783          * and bump the ref count of the module
 784          */
 785         mci->owner = THIS_MODULE;
 786
 787         /* bump ref count on this module */
 788         if (!try_module_get(mci->owner)) {
 789                 err = -ENODEV;
 790                 goto fail_out;
 791         }
 792
 793         /* this instance become part of the mc_kset */
 794         kobj_mci->kset = &mc_kset;
 795
 796         /* register the mc<id> kobject to the mc_kset */
 797         err = kobject_init_and_add(kobj_mci, &ktype_mci, NULL,
 798                                    "mc%d", mci->mc_idx);
 799         if (err) {
 800                 debugf1("%s()Failed to register '.../edac/mc%d'\n",
 801                         __func__, mci->mc_idx);
 802                 goto kobj_reg_fail;
 803         }
 804         kobject_uevent(kobj_mci, KOBJ_ADD);
 805
 806         /* At this point, to 'free' the control struct,
 807          * edac_mc_unregister_sysfs_main_kobj() must be used
 808          */
 809
 810         debugf1("%s() Registered '.../edac/mc%d' kobject\n",
 811                 __func__, mci->mc_idx);
 812
 813         return 0;
 814
 815         /* Error exit stack */
 816
 817 kobj_reg_fail:
 818         module_put(mci->owner);
 819
 820 fail_out:
 821         return err;
 822 }
 823
 824 /*
 825  * edac_mc_register_sysfs_main_kobj
 826  *
 827  *      tears down and the main mci kobject from the mc_kset
 828  */
 829 void edac_mc_unregister_sysfs_main_kobj(struct mem_ctl_info *mci)
 830 {
 831         /* delete the kobj from the mc_kset */
 832         kobject_put(&mci->edac_mci_kobj);
 833 }
 834
 835 #define EDAC_DEVICE_SYMLINK     "device"
 836
 837 /*
 838  * edac_create_mci_instance_attributes
 839  *      create MC driver specific attributes at the topmost level
 840  *      directory of this mci instance.
 841  */
 842 static int edac_create_mci_instance_attributes(struct mem_ctl_info *mci)
 843 {
 844         int err;
 845         struct mcidev_sysfs_attribute *sysfs_attrib;
 846
 847         /* point to the start of the array and iterate over it
 848          * adding each attribute listed to this mci instance's kobject
 849          */
 850         sysfs_attrib = mci->mc_driver_sysfs_attributes;
 851
 852         while (sysfs_attrib && sysfs_attrib->attr.name) {
 853                 err = sysfs_create_file(&mci->edac_mci_kobj,
 854                                         (struct attribute*) sysfs_attrib);
 855                 if (err) {
 856                         return err;
 857                 }
 858
 859                 sysfs_attrib++;
 860         }
 861
 862         return 0;
 863 }
 864
 865 /*
 866  * edac_remove_mci_instance_attributes
 867  *      remove MC driver specific attributes at the topmost level
 868  *      directory of this mci instance.
 869  */
 870 static void edac_remove_mci_instance_attributes(struct mem_ctl_info *mci)
 871 {
 872         struct mcidev_sysfs_attribute *sysfs_attrib;
 873
 874         /* point to the start of the array and iterate over it
 875          * adding each attribute listed to this mci instance's kobject
 876          */
 877         sysfs_attrib = mci->mc_driver_sysfs_attributes;
 878
 879         /* loop if there are attributes and until we hit a NULL entry */
 880         while (sysfs_attrib && sysfs_attrib->attr.name) {
 881                 sysfs_remove_file(&mci->edac_mci_kobj,
 882                                         (struct attribute *) sysfs_attrib);
 883                 sysfs_attrib++;
 884         }
 885 }
 886
 887
 888 /*
 889  * Create a new Memory Controller kobject instance,
 890  *      mc<id> under the 'mc' directory
 891  *
 892  * Return:
 893  *      0       Success
 894  *      !0      Failure
 895  */
 896 int edac_create_sysfs_mci_device(struct mem_ctl_info *mci)
 897 {
 898         int i;
 899         int err;
 900         struct csrow_info *csrow;
 901         struct kobject *kobj_mci = &mci->edac_mci_kobj;
 902
 903         debugf0("%s() idx=%d\n", __func__, mci->mc_idx);
 904
 905         /* create a symlink for the device */
 906         err = sysfs_create_link(kobj_mci, &mci->dev->kobj,
 907                                 EDAC_DEVICE_SYMLINK);
 908         if (err) {
 909                 debugf1("%s() failure to create symlink\n", __func__);
 910                 goto fail0;
 911         }
 912
 913         /* If the low level driver desires some attributes,
 914          * then create them now for the driver.
 915          */
 916         if (mci->mc_driver_sysfs_attributes) {
 917                 err = edac_create_mci_instance_attributes(mci);
 918                 if (err) {
 919                         debugf1("%s() failure to create mci attributes\n",
 920                                 __func__);
 921                         goto fail0;
 922                 }
 923         }
 924
 925         /* Make directories for each CSROW object under the mc<id> kobject
 926          */
 927         for (i = 0; i < mci->nr_csrows; i++) {
 928                 csrow = &mci->csrows[i];
 929
 930                 /* Only expose populated CSROWs */
 931                 if (csrow->nr_pages > 0) {
 932                         err = edac_create_csrow_object(mci, csrow, i);
 933                         if (err) {
 934                                 debugf1("%s() failure: create csrow %d obj\n",
 935                                         __func__, i);
 936                                 goto fail1;
 937                         }
 938                 }
 939         }
 940
 941         return 0;
 942
 943         /* CSROW error: backout what has already been registered,  */
 944 fail1:
 945         for (i--; i >= 0; i--) {
 946                 if (csrow->nr_pages > 0) {
 947                         kobject_put(&mci->csrows[i].kobj);
 948                 }
 949         }
 950
 951         /* remove the mci instance's attributes, if any */
 952         edac_remove_mci_instance_attributes(mci);
 953
 954         /* remove the symlink */
 955         sysfs_remove_link(kobj_mci, EDAC_DEVICE_SYMLINK);
 956
 957 fail0:
 958         return err;
 959 }
 960
 961 /*
 962  * remove a Memory Controller instance
 963  */
 964 void edac_remove_sysfs_mci_device(struct mem_ctl_info *mci)
 965 {
 966         int i;
 967
 968         debugf0("%s()\n", __func__);
 969
 970         /* remove all csrow kobjects */
 971         for (i = 0; i < mci->nr_csrows; i++) {
 972                 if (mci->csrows[i].nr_pages > 0) {
 973                         debugf0("%s()  unreg csrow-%d\n", __func__, i);
 974                         kobject_put(&mci->csrows[i].kobj);
 975                 }
 976         }
 977
 978         debugf0("%s()  remove_link\n", __func__);
 979
 980         /* remove the symlink */
 981         sysfs_remove_link(&mci->edac_mci_kobj, EDAC_DEVICE_SYMLINK);
 982
 983         debugf0("%s()  remove_mci_instance\n", __func__);
 984
 985         /* remove this mci instance's attribtes */
 986         edac_remove_mci_instance_attributes(mci);
 987
 988         debugf0("%s()  unregister this mci kobj\n", __func__);
 989
 990         /* unregister this instance's kobject */
 991         kobject_put(&mci->edac_mci_kobj);
 992 }
 993
 994
 995
 996
 997 /*
 998  * edac_setup_sysfs_mc_kset(void)
 999  *
1000  * Initialize the mc_kset for the 'mc' entry
1001  *      This requires creating the top 'mc' directory with a kset
1002  *      and its controls/attributes.
1003  *
1004  *      To this 'mc' kset, instance 'mci' will be grouped as children.
1005  *
1006  * Return:  0 SUCCESS
1007  *         !0 FAILURE error code
1008  */
1009 int edac_sysfs_setup_mc_kset(void)
1010 {
1011         int err = 0;
1012         struct sysdev_class *edac_class;
1013
1014         debugf1("%s()\n", __func__);
1015
1016         /* get the /sys/devices/system/edac class reference */
1017         edac_class = edac_get_edac_class();
1018         if (edac_class == NULL) {
1019                 debugf1("%s() no edac_class error=%d\n", __func__, err);
1020                 goto fail_out;
1021         }
1022
1023         /* Init the MC's kobject */
1024         kobject_set_name(&mc_kset.kobj, "mc");
1025         mc_kset.kobj.parent = &edac_class->kset.kobj;
1026
1027         /* register the mc_kset */
1028         err = kset_register(&mc_kset);
1029         if (err) {
1030                 debugf1("%s() Failed to register '.../edac/mc'\n", __func__);
1031                 goto fail_out;
1032         }
1033
1034         debugf1("%s() Registered '.../edac/mc' kobject\n", __func__);
1035
1036         return 0;
1037
1038
1039         /* error unwind stack */
1040 fail_out:
1041         return err;
1042 }
1043
1044 /*
1045  * edac_sysfs_teardown_mc_kset
1046  *
1047  *      deconstruct the mc_ket for memory controllers
1048  */
1049 void edac_sysfs_teardown_mc_kset(void)
1050 {
1051         kset_unregister(&mc_kset);
1052 }
1053