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