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         int i;
 148         u32 nr_pages = 0;
 149
 150         for (i = 0; i < csrow->nr_channels; i++)
 151                 nr_pages += csrow->channels[i].dimm->nr_pages;
 152
 153         return sprintf(data, "%u\n", PAGES_TO_MiB(nr_pages));
 154 }
 155
 156 static ssize_t csrow_mem_type_show(struct csrow_info *csrow, char *data,
 157                                 int private)
 158 {
 159         return sprintf(data, "%s\n", mem_types[csrow->channels[0].dimm->mtype]);
 160 }
 161
 162 static ssize_t csrow_dev_type_show(struct csrow_info *csrow, char *data,
 163                                 int private)
 164 {
 165         return sprintf(data, "%s\n", dev_types[csrow->channels[0].dimm->dtype]);
 166 }
 167
 168 static ssize_t csrow_edac_mode_show(struct csrow_info *csrow, char *data,
 169                                 int private)
 170 {
 171         return sprintf(data, "%s\n", edac_caps[csrow->channels[0].dimm->edac_mode]);
 172 }
 173
 174 /* show/store functions for DIMM Label attributes */
 175 static ssize_t channel_dimm_label_show(struct csrow_info *csrow,
 176                                 char *data, int channel)
 177 {
 178         /* if field has not been initialized, there is nothing to send */
 179         if (!csrow->channels[channel].dimm->label[0])
 180                 return 0;
 181
 182         return snprintf(data, EDAC_MC_LABEL_LEN, "%s\n",
 183                         csrow->channels[channel].dimm->label);
 184 }
 185
 186 static ssize_t channel_dimm_label_store(struct csrow_info *csrow,
 187                                         const char *data,
 188                                         size_t count, int channel)
 189 {
 190         ssize_t max_size = 0;
 191
 192         max_size = min((ssize_t) count, (ssize_t) EDAC_MC_LABEL_LEN - 1);
 193         strncpy(csrow->channels[channel].dimm->label, data, max_size);
 194         csrow->channels[channel].dimm->label[max_size] = '\0';
 195
 196         return max_size;
 197 }
 198
 199 /* show function for dynamic chX_ce_count attribute */
 200 static ssize_t channel_ce_count_show(struct csrow_info *csrow,
 201                                 char *data, int channel)
 202 {
 203         return sprintf(data, "%u\n", csrow->channels[channel].ce_count);
 204 }
 205
 206 /* csrow specific attribute structure */
 207 struct csrowdev_attribute {
 208         struct attribute attr;
 209          ssize_t(*show) (struct csrow_info *, char *, int);
 210          ssize_t(*store) (struct csrow_info *, const char *, size_t, int);
 211         int private;
 212 };
 213
 214 #define to_csrow(k) container_of(k, struct csrow_info, kobj)
 215 #define to_csrowdev_attr(a) container_of(a, struct csrowdev_attribute, attr)
 216
 217 /* Set of show/store higher level functions for default csrow attributes */
 218 static ssize_t csrowdev_show(struct kobject *kobj,
 219                         struct attribute *attr, char *buffer)
 220 {
 221         struct csrow_info *csrow = to_csrow(kobj);
 222         struct csrowdev_attribute *csrowdev_attr = to_csrowdev_attr(attr);
 223
 224         if (csrowdev_attr->show)
 225                 return csrowdev_attr->show(csrow,
 226                                         buffer, csrowdev_attr->private);
 227         return -EIO;
 228 }
 229
 230 static ssize_t csrowdev_store(struct kobject *kobj, struct attribute *attr,
 231                         const char *buffer, size_t count)
 232 {
 233         struct csrow_info *csrow = to_csrow(kobj);
 234         struct csrowdev_attribute *csrowdev_attr = to_csrowdev_attr(attr);
 235
 236         if (csrowdev_attr->store)
 237                 return csrowdev_attr->store(csrow,
 238                                         buffer,
 239                                         count, csrowdev_attr->private);
 240         return -EIO;
 241 }
 242
 243 static const struct sysfs_ops csrowfs_ops = {
 244         .show = csrowdev_show,
 245         .store = csrowdev_store
 246 };
 247
 248 #define CSROWDEV_ATTR(_name,_mode,_show,_store,_private)        \
 249 static struct csrowdev_attribute attr_##_name = {                       \
 250         .attr = {.name = __stringify(_name), .mode = _mode },   \
 251         .show   = _show,                                        \
 252         .store  = _store,                                       \
 253         .private = _private,                                    \
 254 };
 255
 256 /* default cwrow<id>/attribute files */
 257 CSROWDEV_ATTR(size_mb, S_IRUGO, csrow_size_show, NULL, 0);
 258 CSROWDEV_ATTR(dev_type, S_IRUGO, csrow_dev_type_show, NULL, 0);
 259 CSROWDEV_ATTR(mem_type, S_IRUGO, csrow_mem_type_show, NULL, 0);
 260 CSROWDEV_ATTR(edac_mode, S_IRUGO, csrow_edac_mode_show, NULL, 0);
 261 CSROWDEV_ATTR(ue_count, S_IRUGO, csrow_ue_count_show, NULL, 0);
 262 CSROWDEV_ATTR(ce_count, S_IRUGO, csrow_ce_count_show, NULL, 0);
 263
 264 /* default attributes of the CSROW<id> object */
 265 static struct csrowdev_attribute *default_csrow_attr[] = {
 266         &attr_dev_type,
 267         &attr_mem_type,
 268         &attr_edac_mode,
 269         &attr_size_mb,
 270         &attr_ue_count,
 271         &attr_ce_count,
 272         NULL,
 273 };
 274
 275 /* possible dynamic channel DIMM Label attribute files */
 276 CSROWDEV_ATTR(ch0_dimm_label, S_IRUGO | S_IWUSR,
 277         channel_dimm_label_show, channel_dimm_label_store, 0);
 278 CSROWDEV_ATTR(ch1_dimm_label, S_IRUGO | S_IWUSR,
 279         channel_dimm_label_show, channel_dimm_label_store, 1);
 280 CSROWDEV_ATTR(ch2_dimm_label, S_IRUGO | S_IWUSR,
 281         channel_dimm_label_show, channel_dimm_label_store, 2);
 282 CSROWDEV_ATTR(ch3_dimm_label, S_IRUGO | S_IWUSR,
 283         channel_dimm_label_show, channel_dimm_label_store, 3);
 284 CSROWDEV_ATTR(ch4_dimm_label, S_IRUGO | S_IWUSR,
 285         channel_dimm_label_show, channel_dimm_label_store, 4);
 286 CSROWDEV_ATTR(ch5_dimm_label, S_IRUGO | S_IWUSR,
 287         channel_dimm_label_show, channel_dimm_label_store, 5);
 288
 289 /* Total possible dynamic DIMM Label attribute file table */
 290 static struct csrowdev_attribute *dynamic_csrow_dimm_attr[] = {
 291         &attr_ch0_dimm_label,
 292         &attr_ch1_dimm_label,
 293         &attr_ch2_dimm_label,
 294         &attr_ch3_dimm_label,
 295         &attr_ch4_dimm_label,
 296         &attr_ch5_dimm_label
 297 };
 298
 299 /* possible dynamic channel ce_count attribute files */
 300 CSROWDEV_ATTR(ch0_ce_count, S_IRUGO | S_IWUSR, channel_ce_count_show, NULL, 0);
 301 CSROWDEV_ATTR(ch1_ce_count, S_IRUGO | S_IWUSR, channel_ce_count_show, NULL, 1);
 302 CSROWDEV_ATTR(ch2_ce_count, S_IRUGO | S_IWUSR, channel_ce_count_show, NULL, 2);
 303 CSROWDEV_ATTR(ch3_ce_count, S_IRUGO | S_IWUSR, channel_ce_count_show, NULL, 3);
 304 CSROWDEV_ATTR(ch4_ce_count, S_IRUGO | S_IWUSR, channel_ce_count_show, NULL, 4);
 305 CSROWDEV_ATTR(ch5_ce_count, S_IRUGO | S_IWUSR, channel_ce_count_show, NULL, 5);
 306
 307 /* Total possible dynamic ce_count attribute file table */
 308 static struct csrowdev_attribute *dynamic_csrow_ce_count_attr[] = {
 309         &attr_ch0_ce_count,
 310         &attr_ch1_ce_count,
 311         &attr_ch2_ce_count,
 312         &attr_ch3_ce_count,
 313         &attr_ch4_ce_count,
 314         &attr_ch5_ce_count
 315 };
 316
 317 #define EDAC_NR_CHANNELS        6
 318
 319 /* Create dynamic CHANNEL files, indexed by 'chan',  under specifed CSROW */
 320 static int edac_create_channel_files(struct kobject *kobj, int chan)
 321 {
 322         int err = -ENODEV;
 323
 324         if (chan >= EDAC_NR_CHANNELS)
 325                 return err;
 326
 327         /* create the DIMM label attribute file */
 328         err = sysfs_create_file(kobj,
 329                                 (struct attribute *)
 330                                 dynamic_csrow_dimm_attr[chan]);
 331
 332         if (!err) {
 333                 /* create the CE Count attribute file */
 334                 err = sysfs_create_file(kobj,
 335                                         (struct attribute *)
 336                                         dynamic_csrow_ce_count_attr[chan]);
 337         } else {
 338                 debugf1("%s()  dimm labels and ce_count files created",
 339                         __func__);
 340         }
 341
 342         return err;
 343 }
 344
 345 /* No memory to release for this kobj */
 346 static void edac_csrow_instance_release(struct kobject *kobj)
 347 {
 348         struct mem_ctl_info *mci;
 349         struct csrow_info *cs;
 350
 351         debugf1("%s()\n", __func__);
 352
 353         cs = container_of(kobj, struct csrow_info, kobj);
 354         mci = cs->mci;
 355
 356         kobject_put(&mci->edac_mci_kobj);
 357 }
 358
 359 /* the kobj_type instance for a CSROW */
 360 static struct kobj_type ktype_csrow = {
 361         .release = edac_csrow_instance_release,
 362         .sysfs_ops = &csrowfs_ops,
 363         .default_attrs = (struct attribute **)default_csrow_attr,
 364 };
 365
 366 /* Create a CSROW object under specifed edac_mc_device */
 367 static int edac_create_csrow_object(struct mem_ctl_info *mci,
 368                                         struct csrow_info *csrow, int index)
 369 {
 370         struct kobject *kobj_mci = &mci->edac_mci_kobj;
 371         struct kobject *kobj;
 372         int chan;
 373         int err;
 374
 375         /* generate ..../edac/mc/mc<id>/csrow<index>   */
 376         memset(&csrow->kobj, 0, sizeof(csrow->kobj));
 377         csrow->mci = mci;       /* include container up link */
 378
 379         /* bump the mci instance's kobject's ref count */
 380         kobj = kobject_get(&mci->edac_mci_kobj);
 381         if (!kobj) {
 382                 err = -ENODEV;
 383                 goto err_out;
 384         }
 385
 386         /* Instanstiate the csrow object */
 387         err = kobject_init_and_add(&csrow->kobj, &ktype_csrow, kobj_mci,
 388                                    "csrow%d", index);
 389         if (err)
 390                 goto err_release_top_kobj;
 391
 392         /* At this point, to release a csrow kobj, one must
 393          * call the kobject_put and allow that tear down
 394          * to work the releasing
 395          */
 396
 397         /* Create the dyanmic attribute files on this csrow,
 398          * namely, the DIMM labels and the channel ce_count
 399          */
 400         for (chan = 0; chan < csrow->nr_channels; chan++) {
 401                 err = edac_create_channel_files(&csrow->kobj, chan);
 402                 if (err) {
 403                         /* special case the unregister here */
 404                         kobject_put(&csrow->kobj);
 405                         goto err_out;
 406                 }
 407         }
 408         kobject_uevent(&csrow->kobj, KOBJ_ADD);
 409         return 0;
 410
 411         /* error unwind stack */
 412 err_release_top_kobj:
 413         kobject_put(&mci->edac_mci_kobj);
 414
 415 err_out:
 416         return err;
 417 }
 418
 419 /* default sysfs methods and data structures for the main MCI kobject */
 420
 421 static ssize_t mci_reset_counters_store(struct mem_ctl_info *mci,
 422                                         const char *data, size_t count)
 423 {
 424         int row, chan;
 425
 426         mci->ue_noinfo_count = 0;
 427         mci->ce_noinfo_count = 0;
 428         mci->ue_mc = 0;
 429         mci->ce_mc = 0;
 430
 431         for (row = 0; row < mci->nr_csrows; row++) {
 432                 struct csrow_info *ri = &mci->csrows[row];
 433
 434                 ri->ue_count = 0;
 435                 ri->ce_count = 0;
 436
 437                 for (chan = 0; chan < ri->nr_channels; chan++)
 438                         ri->channels[chan].ce_count = 0;
 439         }
 440
 441         mci->start_time = jiffies;
 442         return count;
 443 }
 444
 445 /* Memory scrubbing interface:
 446  *
 447  * A MC driver can limit the scrubbing bandwidth based on the CPU type.
 448  * Therefore, ->set_sdram_scrub_rate should be made to return the actual
 449  * bandwidth that is accepted or 0 when scrubbing is to be disabled.
 450  *
 451  * Negative value still means that an error has occurred while setting
 452  * the scrub rate.
 453  */
 454 static ssize_t mci_sdram_scrub_rate_store(struct mem_ctl_info *mci,
 455                                           const char *data, size_t count)
 456 {
 457         unsigned long bandwidth = 0;
 458         int new_bw = 0;
 459
 460         if (!mci->set_sdram_scrub_rate)
 461                 return -ENODEV;
 462
 463         if (strict_strtoul(data, 10, &bandwidth) < 0)
 464                 return -EINVAL;
 465
 466         new_bw = mci->set_sdram_scrub_rate(mci, bandwidth);
 467         if (new_bw < 0) {
 468                 edac_printk(KERN_WARNING, EDAC_MC,
 469                             "Error setting scrub rate to: %lu\n", bandwidth);
 470                 return -EINVAL;
 471         }
 472
 473         return count;
 474 }
 475
 476 /*
 477  * ->get_sdram_scrub_rate() return value semantics same as above.
 478  */
 479 static ssize_t mci_sdram_scrub_rate_show(struct mem_ctl_info *mci, char *data)
 480 {
 481         int bandwidth = 0;
 482
 483         if (!mci->get_sdram_scrub_rate)
 484                 return -ENODEV;
 485
 486         bandwidth = mci->get_sdram_scrub_rate(mci);
 487         if (bandwidth < 0) {
 488                 edac_printk(KERN_DEBUG, EDAC_MC, "Error reading scrub rate\n");
 489                 return bandwidth;
 490         }
 491
 492         return sprintf(data, "%d\n", bandwidth);
 493 }
 494
 495 /* default attribute files for the MCI object */
 496 static ssize_t mci_ue_count_show(struct mem_ctl_info *mci, char *data)
 497 {
 498         return sprintf(data, "%d\n", mci->ue_mc);
 499 }
 500
 501 static ssize_t mci_ce_count_show(struct mem_ctl_info *mci, char *data)
 502 {
 503         return sprintf(data, "%d\n", mci->ce_mc);
 504 }
 505
 506 static ssize_t mci_ce_noinfo_show(struct mem_ctl_info *mci, char *data)
 507 {
 508         return sprintf(data, "%d\n", mci->ce_noinfo_count);
 509 }
 510
 511 static ssize_t mci_ue_noinfo_show(struct mem_ctl_info *mci, char *data)
 512 {
 513         return sprintf(data, "%d\n", mci->ue_noinfo_count);
 514 }
 515
 516 static ssize_t mci_seconds_show(struct mem_ctl_info *mci, char *data)
 517 {
 518         return sprintf(data, "%ld\n", (jiffies - mci->start_time) / HZ);
 519 }
 520
 521 static ssize_t mci_ctl_name_show(struct mem_ctl_info *mci, char *data)
 522 {
 523         return sprintf(data, "%s\n", mci->ctl_name);
 524 }
 525
 526 static ssize_t mci_size_mb_show(struct mem_ctl_info *mci, char *data)
 527 {
 528         int total_pages = 0, csrow_idx, j;
 529
 530         for (csrow_idx = 0; csrow_idx < mci->nr_csrows; csrow_idx++) {
 531                 struct csrow_info *csrow = &mci->csrows[csrow_idx];
 532
 533                 for (j = 0; j < csrow->nr_channels; j++) {
 534                         struct dimm_info *dimm = csrow->channels[j].dimm;
 535
 536                         total_pages += dimm->nr_pages;
 537                 }
 538         }
 539
 540         return sprintf(data, "%u\n", PAGES_TO_MiB(total_pages));
 541 }
 542
 543 #define to_mci(k) container_of(k, struct mem_ctl_info, edac_mci_kobj)
 544 #define to_mcidev_attr(a) container_of(a,struct mcidev_sysfs_attribute,attr)
 545
 546 /* MCI show/store functions for top most object */
 547 static ssize_t mcidev_show(struct kobject *kobj, struct attribute *attr,
 548                         char *buffer)
 549 {
 550         struct mem_ctl_info *mem_ctl_info = to_mci(kobj);
 551         struct mcidev_sysfs_attribute *mcidev_attr = to_mcidev_attr(attr);
 552
 553         debugf1("%s() mem_ctl_info %p\n", __func__, mem_ctl_info);
 554
 555         if (mcidev_attr->show)
 556                 return mcidev_attr->show(mem_ctl_info, buffer);
 557
 558         return -EIO;
 559 }
 560
 561 static ssize_t mcidev_store(struct kobject *kobj, struct attribute *attr,
 562                         const char *buffer, size_t count)
 563 {
 564         struct mem_ctl_info *mem_ctl_info = to_mci(kobj);
 565         struct mcidev_sysfs_attribute *mcidev_attr = to_mcidev_attr(attr);
 566
 567         debugf1("%s() mem_ctl_info %p\n", __func__, mem_ctl_info);
 568
 569         if (mcidev_attr->store)
 570                 return mcidev_attr->store(mem_ctl_info, buffer, count);
 571
 572         return -EIO;
 573 }
 574
 575 /* Intermediate show/store table */
 576 static const struct sysfs_ops mci_ops = {
 577         .show = mcidev_show,
 578         .store = mcidev_store
 579 };
 580
 581 #define MCIDEV_ATTR(_name,_mode,_show,_store)                   \
 582 static struct mcidev_sysfs_attribute mci_attr_##_name = {                       \
 583         .attr = {.name = __stringify(_name), .mode = _mode },   \
 584         .show   = _show,                                        \
 585         .store  = _store,                                       \
 586 };
 587
 588 /* default Control file */
 589 MCIDEV_ATTR(reset_counters, S_IWUSR, NULL, mci_reset_counters_store);
 590
 591 /* default Attribute files */
 592 MCIDEV_ATTR(mc_name, S_IRUGO, mci_ctl_name_show, NULL);
 593 MCIDEV_ATTR(size_mb, S_IRUGO, mci_size_mb_show, NULL);
 594 MCIDEV_ATTR(seconds_since_reset, S_IRUGO, mci_seconds_show, NULL);
 595 MCIDEV_ATTR(ue_noinfo_count, S_IRUGO, mci_ue_noinfo_show, NULL);
 596 MCIDEV_ATTR(ce_noinfo_count, S_IRUGO, mci_ce_noinfo_show, NULL);
 597 MCIDEV_ATTR(ue_count, S_IRUGO, mci_ue_count_show, NULL);
 598 MCIDEV_ATTR(ce_count, S_IRUGO, mci_ce_count_show, NULL);
 599
 600 /* memory scrubber attribute file */
 601 MCIDEV_ATTR(sdram_scrub_rate, S_IRUGO | S_IWUSR, mci_sdram_scrub_rate_show,
 602         mci_sdram_scrub_rate_store);
 603
 604 static struct mcidev_sysfs_attribute *mci_attr[] = {
 605         &mci_attr_reset_counters,
 606         &mci_attr_mc_name,
 607         &mci_attr_size_mb,
 608         &mci_attr_seconds_since_reset,
 609         &mci_attr_ue_noinfo_count,
 610         &mci_attr_ce_noinfo_count,
 611         &mci_attr_ue_count,
 612         &mci_attr_ce_count,
 613         &mci_attr_sdram_scrub_rate,
 614         NULL
 615 };
 616
 617
 618 /*
 619  * Release of a MC controlling instance
 620  *
 621  *      each MC control instance has the following resources upon entry:
 622  *              a) a ref count on the top memctl kobj
 623  *              b) a ref count on this module
 624  *
 625  *      this function must decrement those ref counts and then
 626  *      issue a free on the instance's memory
 627  */
 628 static void edac_mci_control_release(struct kobject *kobj)
 629 {
 630         struct mem_ctl_info *mci;
 631
 632         mci = to_mci(kobj);
 633
 634         debugf0("%s() mci instance idx=%d releasing\n", __func__, mci->mc_idx);
 635
 636         /* decrement the module ref count */
 637         module_put(mci->owner);
 638 }
 639
 640 static struct kobj_type ktype_mci = {
 641         .release = edac_mci_control_release,
 642         .sysfs_ops = &mci_ops,
 643         .default_attrs = (struct attribute **)mci_attr,
 644 };
 645
 646 /* EDAC memory controller sysfs kset:
 647  *      /sys/devices/system/edac/mc
 648  */
 649 static struct kset *mc_kset;
 650
 651 /*
 652  * edac_mc_register_sysfs_main_kobj
 653  *
 654  *      setups and registers the main kobject for each mci
 655  */
 656 int edac_mc_register_sysfs_main_kobj(struct mem_ctl_info *mci)
 657 {
 658         struct kobject *kobj_mci;
 659         int err;
 660
 661         debugf1("%s()\n", __func__);
 662
 663         kobj_mci = &mci->edac_mci_kobj;
 664
 665         /* Init the mci's kobject */
 666         memset(kobj_mci, 0, sizeof(*kobj_mci));
 667
 668         /* Record which module 'owns' this control structure
 669          * and bump the ref count of the module
 670          */
 671         mci->owner = THIS_MODULE;
 672
 673         /* bump ref count on this module */
 674         if (!try_module_get(mci->owner)) {
 675                 err = -ENODEV;
 676                 goto fail_out;
 677         }
 678
 679         /* this instance become part of the mc_kset */
 680         kobj_mci->kset = mc_kset;
 681
 682         /* register the mc<id> kobject to the mc_kset */
 683         err = kobject_init_and_add(kobj_mci, &ktype_mci, NULL,
 684                                    "mc%d", mci->mc_idx);
 685         if (err) {
 686                 debugf1("%s()Failed to register '.../edac/mc%d'\n",
 687                         __func__, mci->mc_idx);
 688                 goto kobj_reg_fail;
 689         }
 690         kobject_uevent(kobj_mci, KOBJ_ADD);
 691
 692         /* At this point, to 'free' the control struct,
 693          * edac_mc_unregister_sysfs_main_kobj() must be used
 694          */
 695
 696         debugf1("%s() Registered '.../edac/mc%d' kobject\n",
 697                 __func__, mci->mc_idx);
 698
 699         return 0;
 700
 701         /* Error exit stack */
 702
 703 kobj_reg_fail:
 704         module_put(mci->owner);
 705
 706 fail_out:
 707         return err;
 708 }
 709
 710 /*
 711  * edac_mc_register_sysfs_main_kobj
 712  *
 713  *      tears down and the main mci kobject from the mc_kset
 714  */
 715 void edac_mc_unregister_sysfs_main_kobj(struct mem_ctl_info *mci)
 716 {
 717         debugf1("%s()\n", __func__);
 718
 719         /* delete the kobj from the mc_kset */
 720         kobject_put(&mci->edac_mci_kobj);
 721 }
 722
 723 #define EDAC_DEVICE_SYMLINK     "device"
 724
 725 #define grp_to_mci(k) (container_of(k, struct mcidev_sysfs_group_kobj, kobj)->mci)
 726
 727 /* MCI show/store functions for top most object */
 728 static ssize_t inst_grp_show(struct kobject *kobj, struct attribute *attr,
 729                         char *buffer)
 730 {
 731         struct mem_ctl_info *mem_ctl_info = grp_to_mci(kobj);
 732         struct mcidev_sysfs_attribute *mcidev_attr = to_mcidev_attr(attr);
 733
 734         debugf1("%s() mem_ctl_info %p\n", __func__, mem_ctl_info);
 735
 736         if (mcidev_attr->show)
 737                 return mcidev_attr->show(mem_ctl_info, buffer);
 738
 739         return -EIO;
 740 }
 741
 742 static ssize_t inst_grp_store(struct kobject *kobj, struct attribute *attr,
 743                         const char *buffer, size_t count)
 744 {
 745         struct mem_ctl_info *mem_ctl_info = grp_to_mci(kobj);
 746         struct mcidev_sysfs_attribute *mcidev_attr = to_mcidev_attr(attr);
 747
 748         debugf1("%s() mem_ctl_info %p\n", __func__, mem_ctl_info);
 749
 750         if (mcidev_attr->store)
 751                 return mcidev_attr->store(mem_ctl_info, buffer, count);
 752
 753         return -EIO;
 754 }
 755
 756 /* No memory to release for this kobj */
 757 static void edac_inst_grp_release(struct kobject *kobj)
 758 {
 759         struct mcidev_sysfs_group_kobj *grp;
 760         struct mem_ctl_info *mci;
 761
 762         debugf1("%s()\n", __func__);
 763
 764         grp = container_of(kobj, struct mcidev_sysfs_group_kobj, kobj);
 765         mci = grp->mci;
 766 }
 767
 768 /* Intermediate show/store table */
 769 static struct sysfs_ops inst_grp_ops = {
 770         .show = inst_grp_show,
 771         .store = inst_grp_store
 772 };
 773
 774 /* the kobj_type instance for a instance group */
 775 static struct kobj_type ktype_inst_grp = {
 776         .release = edac_inst_grp_release,
 777         .sysfs_ops = &inst_grp_ops,
 778 };
 779
 780
 781 /*
 782  * edac_create_mci_instance_attributes
 783  *      create MC driver specific attributes bellow an specified kobj
 784  * This routine calls itself recursively, in order to create an entire
 785  * object tree.
 786  */
 787 static int edac_create_mci_instance_attributes(struct mem_ctl_info *mci,
 788                                 const struct mcidev_sysfs_attribute *sysfs_attrib,
 789                                 struct kobject *kobj)
 790 {
 791         int err;
 792
 793         debugf4("%s()\n", __func__);
 794
 795         while (sysfs_attrib) {
 796                 debugf4("%s() sysfs_attrib = %p\n",__func__, sysfs_attrib);
 797                 if (sysfs_attrib->grp) {
 798                         struct mcidev_sysfs_group_kobj *grp_kobj;
 799
 800                         grp_kobj = kzalloc(sizeof(*grp_kobj), GFP_KERNEL);
 801                         if (!grp_kobj)
 802                                 return -ENOMEM;
 803
 804                         grp_kobj->grp = sysfs_attrib->grp;
 805                         grp_kobj->mci = mci;
 806                         list_add_tail(&grp_kobj->list, &mci->grp_kobj_list);
 807
 808                         debugf0("%s() grp %s, mci %p\n", __func__,
 809                                 sysfs_attrib->grp->name, mci);
 810
 811                         err = kobject_init_and_add(&grp_kobj->kobj,
 812                                                 &ktype_inst_grp,
 813                                                 &mci->edac_mci_kobj,
 814                                                 sysfs_attrib->grp->name);
 815                         if (err < 0) {
 816                                 printk(KERN_ERR "kobject_init_and_add failed: %d\n", err);
 817                                 return err;
 818                         }
 819                         err = edac_create_mci_instance_attributes(mci,
 820                                         grp_kobj->grp->mcidev_attr,
 821                                         &grp_kobj->kobj);
 822
 823                         if (err < 0)
 824                                 return err;
 825                 } else if (sysfs_attrib->attr.name) {
 826                         debugf4("%s() file %s\n", __func__,
 827                                 sysfs_attrib->attr.name);
 828
 829                         err = sysfs_create_file(kobj, &sysfs_attrib->attr);
 830                         if (err < 0) {
 831                                 printk(KERN_ERR "sysfs_create_file failed: %d\n", err);
 832                                 return err;
 833                         }
 834                 } else
 835                         break;
 836
 837                 sysfs_attrib++;
 838         }
 839
 840         return 0;
 841 }
 842
 843 /*
 844  * edac_remove_mci_instance_attributes
 845  *      remove MC driver specific attributes at the topmost level
 846  *      directory of this mci instance.
 847  */
 848 static void edac_remove_mci_instance_attributes(struct mem_ctl_info *mci,
 849                                 const struct mcidev_sysfs_attribute *sysfs_attrib,
 850                                 struct kobject *kobj, int count)
 851 {
 852         struct mcidev_sysfs_group_kobj *grp_kobj, *tmp;
 853
 854         debugf1("%s()\n", __func__);
 855
 856         /*
 857          * loop if there are attributes and until we hit a NULL entry
 858          * Remove first all the attributes
 859          */
 860         while (sysfs_attrib) {
 861                 debugf4("%s() sysfs_attrib = %p\n",__func__, sysfs_attrib);
 862                 if (sysfs_attrib->grp) {
 863                         debugf4("%s() seeking for group %s\n",
 864                                 __func__, sysfs_attrib->grp->name);
 865                         list_for_each_entry(grp_kobj,
 866                                             &mci->grp_kobj_list, list) {
 867                                 debugf4("%s() grp_kobj->grp = %p\n",__func__, grp_kobj->grp);
 868                                 if (grp_kobj->grp == sysfs_attrib->grp) {
 869                                         edac_remove_mci_instance_attributes(mci,
 870                                                     grp_kobj->grp->mcidev_attr,
 871                                                     &grp_kobj->kobj, count + 1);
 872                                         debugf4("%s() group %s\n", __func__,
 873                                                 sysfs_attrib->grp->name);
 874                                         kobject_put(&grp_kobj->kobj);
 875                                 }
 876                         }
 877                         debugf4("%s() end of seeking for group %s\n",
 878                                 __func__, sysfs_attrib->grp->name);
 879                 } else if (sysfs_attrib->attr.name) {
 880                         debugf4("%s() file %s\n", __func__,
 881                                 sysfs_attrib->attr.name);
 882                         sysfs_remove_file(kobj, &sysfs_attrib->attr);
 883                 } else
 884                         break;
 885                 sysfs_attrib++;
 886         }
 887
 888         /* Remove the group objects */
 889         if (count)
 890                 return;
 891         list_for_each_entry_safe(grp_kobj, tmp,
 892                                  &mci->grp_kobj_list, list) {
 893                 list_del(&grp_kobj->list);
 894                 kfree(grp_kobj);
 895         }
 896 }
 897
 898
 899 /*
 900  * Create a new Memory Controller kobject instance,
 901  *      mc<id> under the 'mc' directory
 902  *
 903  * Return:
 904  *      0       Success
 905  *      !0      Failure
 906  */
 907 int edac_create_sysfs_mci_device(struct mem_ctl_info *mci)
 908 {
 909         int i, j;
 910         int err;
 911         struct csrow_info *csrow;
 912         struct kobject *kobj_mci = &mci->edac_mci_kobj;
 913
 914         debugf0("%s() idx=%d\n", __func__, mci->mc_idx);
 915
 916         INIT_LIST_HEAD(&mci->grp_kobj_list);
 917
 918         /* create a symlink for the device */
 919         err = sysfs_create_link(kobj_mci, &mci->dev->kobj,
 920                                 EDAC_DEVICE_SYMLINK);
 921         if (err) {
 922                 debugf1("%s() failure to create symlink\n", __func__);
 923                 goto fail0;
 924         }
 925
 926         /* If the low level driver desires some attributes,
 927          * then create them now for the driver.
 928          */
 929         if (mci->mc_driver_sysfs_attributes) {
 930                 err = edac_create_mci_instance_attributes(mci,
 931                                         mci->mc_driver_sysfs_attributes,
 932                                         &mci->edac_mci_kobj);
 933                 if (err) {
 934                         debugf1("%s() failure to create mci attributes\n",
 935                                 __func__);
 936                         goto fail0;
 937                 }
 938         }
 939
 940         /* Make directories for each CSROW object under the mc<id> kobject
 941          */
 942         for (i = 0; i < mci->nr_csrows; i++) {
 943                 int nr_pages = 0;
 944
 945                 csrow = &mci->csrows[i];
 946                 for (j = 0; j < csrow->nr_channels; j++)
 947                         nr_pages += csrow->channels[j].dimm->nr_pages;
 948
 949                 if (nr_pages > 0) {
 950                         err = edac_create_csrow_object(mci, csrow, i);
 951                         if (err) {
 952                                 debugf1("%s() failure: create csrow %d obj\n",
 953                                         __func__, i);
 954                                 goto fail1;
 955                         }
 956                 }
 957         }
 958
 959         return 0;
 960
 961 fail1:
 962         for (i--; i >= 0; i--) {
 963                 int nr_pages = 0;
 964
 965                 csrow = &mci->csrows[i];
 966                 for (j = 0; j < csrow->nr_channels; j++)
 967                         nr_pages += csrow->channels[j].dimm->nr_pages;
 968                 if (nr_pages > 0)
 969                         kobject_put(&mci->csrows[i].kobj);
 970         }
 971
 972         /* remove the mci instance's attributes, if any */
 973         edac_remove_mci_instance_attributes(mci,
 974                 mci->mc_driver_sysfs_attributes, &mci->edac_mci_kobj, 0);
 975
 976         /* remove the symlink */
 977         sysfs_remove_link(kobj_mci, EDAC_DEVICE_SYMLINK);
 978
 979 fail0:
 980         return err;
 981 }
 982
 983 /*
 984  * remove a Memory Controller instance
 985  */
 986 void edac_remove_sysfs_mci_device(struct mem_ctl_info *mci)
 987 {
 988         struct csrow_info *csrow;
 989         int i, j;
 990
 991         debugf0("%s()\n", __func__);
 992
 993         /* remove all csrow kobjects */
 994         debugf4("%s()  unregister this mci kobj\n", __func__);
 995         for (i = 0; i < mci->nr_csrows; i++) {
 996                 int nr_pages = 0;
 997
 998                 csrow = &mci->csrows[i];
 999                 for (j = 0; j < csrow->nr_channels; j++)
1000                         nr_pages += csrow->channels[j].dimm->nr_pages;
1001                 if (nr_pages > 0) {
1002                         debugf0("%s()  unreg csrow-%d\n", __func__, i);
1003                         kobject_put(&mci->csrows[i].kobj);
1004                 }
1005         }
1006
1007         /* remove this mci instance's attribtes */
1008         if (mci->mc_driver_sysfs_attributes) {
1009                 debugf4("%s()  unregister mci private attributes\n", __func__);
1010                 edac_remove_mci_instance_attributes(mci,
1011                                                 mci->mc_driver_sysfs_attributes,
1012                                                 &mci->edac_mci_kobj, 0);
1013         }
1014
1015         /* remove the symlink */
1016         debugf4("%s()  remove_link\n", __func__);
1017         sysfs_remove_link(&mci->edac_mci_kobj, EDAC_DEVICE_SYMLINK);
1018
1019         /* unregister this instance's kobject */
1020         debugf4("%s()  remove_mci_instance\n", __func__);
1021         kobject_put(&mci->edac_mci_kobj);
1022 }
1023
1024
1025
1026
1027 /*
1028  * edac_setup_sysfs_mc_kset(void)
1029  *
1030  * Initialize the mc_kset for the 'mc' entry
1031  *      This requires creating the top 'mc' directory with a kset
1032  *      and its controls/attributes.
1033  *
1034  *      To this 'mc' kset, instance 'mci' will be grouped as children.
1035  *
1036  * Return:  0 SUCCESS
1037  *         !0 FAILURE error code
1038  */
1039 int edac_sysfs_setup_mc_kset(void)
1040 {
1041         int err = -EINVAL;
1042         struct bus_type *edac_subsys;
1043
1044         debugf1("%s()\n", __func__);
1045
1046         /* get the /sys/devices/system/edac subsys reference */
1047         edac_subsys = edac_get_sysfs_subsys();
1048         if (edac_subsys == NULL) {
1049                 debugf1("%s() no edac_subsys error=%d\n", __func__, err);
1050                 goto fail_out;
1051         }
1052
1053         /* Init the MC's kobject */
1054         mc_kset = kset_create_and_add("mc", NULL, &edac_subsys->dev_root->kobj);
1055         if (!mc_kset) {
1056                 err = -ENOMEM;
1057                 debugf1("%s() Failed to register '.../edac/mc'\n", __func__);
1058                 goto fail_kset;
1059         }
1060
1061         debugf1("%s() Registered '.../edac/mc' kobject\n", __func__);
1062
1063         return 0;
1064
1065 fail_kset:
1066         edac_put_sysfs_subsys();
1067
1068 fail_out:
1069         return err;
1070 }
1071
1072 /*
1073  * edac_sysfs_teardown_mc_kset
1074  *
1075  *      deconstruct the mc_ket for memory controllers
1076  */
1077 void edac_sysfs_teardown_mc_kset(void)
1078 {
1079         kset_unregister(mc_kset);
1080         edac_put_sysfs_subsys();
1081 }
1082