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