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1/*2 * edac_mc kernel module3 * (C) 2005-2007 Linux Networx (http://lnxi.com)4 *5 * This file may be distributed under the terms of the6 * GNU General Public License.7 *8 * Written Doug Thompson <norsk5@xmission.com> www.softwarebitmaker.com9 *10 * (c) 2012-2013 - Mauro Carvalho Chehab11 * The entire API were re-written, and ported to use struct device12 *13 */14 15#include <linux/ctype.h>16#include <linux/slab.h>17#include <linux/edac.h>18#include <linux/bug.h>19#include <linux/pm_runtime.h>20#include <linux/uaccess.h>21 22#include "edac_mc.h"23#include "edac_module.h"24 25/* MC EDAC Controls, setable by module parameter, and sysfs */26static int edac_mc_log_ue = 1;27static int edac_mc_log_ce = 1;28static int edac_mc_panic_on_ue;29static unsigned int edac_mc_poll_msec = 1000;30 31/* Getter functions for above */32int edac_mc_get_log_ue(void)33{34 return edac_mc_log_ue;35}36 37int edac_mc_get_log_ce(void)38{39 return edac_mc_log_ce;40}41 42int edac_mc_get_panic_on_ue(void)43{44 return edac_mc_panic_on_ue;45}46 47/* this is temporary */48unsigned int edac_mc_get_poll_msec(void)49{50 return edac_mc_poll_msec;51}52 53static int edac_set_poll_msec(const char *val, const struct kernel_param *kp)54{55 unsigned int i;56 int ret;57 58 if (!val)59 return -EINVAL;60 61 ret = kstrtouint(val, 0, &i);62 if (ret)63 return ret;64 65 if (i < 1000)66 return -EINVAL;67 68 *((unsigned int *)kp->arg) = i;69 70 /* notify edac_mc engine to reset the poll period */71 edac_mc_reset_delay_period(i);72 73 return 0;74}75 76/* Parameter declarations for above */77module_param(edac_mc_panic_on_ue, int, 0644);78MODULE_PARM_DESC(edac_mc_panic_on_ue, "Panic on uncorrected error: 0=off 1=on");79module_param(edac_mc_log_ue, int, 0644);80MODULE_PARM_DESC(edac_mc_log_ue,81 "Log uncorrectable error to console: 0=off 1=on");82module_param(edac_mc_log_ce, int, 0644);83MODULE_PARM_DESC(edac_mc_log_ce,84 "Log correctable error to console: 0=off 1=on");85module_param_call(edac_mc_poll_msec, edac_set_poll_msec, param_get_uint,86 &edac_mc_poll_msec, 0644);87MODULE_PARM_DESC(edac_mc_poll_msec, "Polling period in milliseconds");88 89static struct device *mci_pdev;90 91/*92 * various constants for Memory Controllers93 */94static const char * const dev_types[] = {95 [DEV_UNKNOWN] = "Unknown",96 [DEV_X1] = "x1",97 [DEV_X2] = "x2",98 [DEV_X4] = "x4",99 [DEV_X8] = "x8",100 [DEV_X16] = "x16",101 [DEV_X32] = "x32",102 [DEV_X64] = "x64"103};104 105static const char * const edac_caps[] = {106 [EDAC_UNKNOWN] = "Unknown",107 [EDAC_NONE] = "None",108 [EDAC_RESERVED] = "Reserved",109 [EDAC_PARITY] = "PARITY",110 [EDAC_EC] = "EC",111 [EDAC_SECDED] = "SECDED",112 [EDAC_S2ECD2ED] = "S2ECD2ED",113 [EDAC_S4ECD4ED] = "S4ECD4ED",114 [EDAC_S8ECD8ED] = "S8ECD8ED",115 [EDAC_S16ECD16ED] = "S16ECD16ED"116};117 118#ifdef CONFIG_EDAC_LEGACY_SYSFS119/*120 * EDAC sysfs CSROW data structures and methods121 */122 123#define to_csrow(k) container_of(k, struct csrow_info, dev)124 125/*126 * We need it to avoid namespace conflicts between the legacy API127 * and the per-dimm/per-rank one128 */129#define DEVICE_ATTR_LEGACY(_name, _mode, _show, _store) \130 static struct device_attribute dev_attr_legacy_##_name = __ATTR(_name, _mode, _show, _store)131 132struct dev_ch_attribute {133 struct device_attribute attr;134 unsigned int channel;135};136 137#define DEVICE_CHANNEL(_name, _mode, _show, _store, _var) \138 static struct dev_ch_attribute dev_attr_legacy_##_name = \139 { __ATTR(_name, _mode, _show, _store), (_var) }140 141#define to_channel(k) (container_of(k, struct dev_ch_attribute, attr)->channel)142 143/* Set of more default csrow<id> attribute show/store functions */144static ssize_t csrow_ue_count_show(struct device *dev,145 struct device_attribute *mattr, char *data)146{147 struct csrow_info *csrow = to_csrow(dev);148 149 return sysfs_emit(data, "%u\n", csrow->ue_count);150}151 152static ssize_t csrow_ce_count_show(struct device *dev,153 struct device_attribute *mattr, char *data)154{155 struct csrow_info *csrow = to_csrow(dev);156 157 return sysfs_emit(data, "%u\n", csrow->ce_count);158}159 160static ssize_t csrow_size_show(struct device *dev,161 struct device_attribute *mattr, char *data)162{163 struct csrow_info *csrow = to_csrow(dev);164 int i;165 u32 nr_pages = 0;166 167 for (i = 0; i < csrow->nr_channels; i++)168 nr_pages += csrow->channels[i]->dimm->nr_pages;169 return sysfs_emit(data, "%u\n", PAGES_TO_MiB(nr_pages));170}171 172static ssize_t csrow_mem_type_show(struct device *dev,173 struct device_attribute *mattr, char *data)174{175 struct csrow_info *csrow = to_csrow(dev);176 177 return sysfs_emit(data, "%s\n", edac_mem_types[csrow->channels[0]->dimm->mtype]);178}179 180static ssize_t csrow_dev_type_show(struct device *dev,181 struct device_attribute *mattr, char *data)182{183 struct csrow_info *csrow = to_csrow(dev);184 185 return sysfs_emit(data, "%s\n", dev_types[csrow->channels[0]->dimm->dtype]);186}187 188static ssize_t csrow_edac_mode_show(struct device *dev,189 struct device_attribute *mattr,190 char *data)191{192 struct csrow_info *csrow = to_csrow(dev);193 194 return sysfs_emit(data, "%s\n", edac_caps[csrow->channels[0]->dimm->edac_mode]);195}196 197/* show/store functions for DIMM Label attributes */198static ssize_t channel_dimm_label_show(struct device *dev,199 struct device_attribute *mattr,200 char *data)201{202 struct csrow_info *csrow = to_csrow(dev);203 unsigned int chan = to_channel(mattr);204 struct rank_info *rank = csrow->channels[chan];205 206 /* if field has not been initialized, there is nothing to send */207 if (!rank->dimm->label[0])208 return 0;209 210 return sysfs_emit(data, "%s\n", rank->dimm->label);211}212 213static ssize_t channel_dimm_label_store(struct device *dev,214 struct device_attribute *mattr,215 const char *data, size_t count)216{217 struct csrow_info *csrow = to_csrow(dev);218 unsigned int chan = to_channel(mattr);219 struct rank_info *rank = csrow->channels[chan];220 size_t copy_count = count;221 222 if (count == 0)223 return -EINVAL;224 225 if (data[count - 1] == '\0' || data[count - 1] == '\n')226 copy_count -= 1;227 228 if (copy_count == 0 || copy_count >= sizeof(rank->dimm->label))229 return -EINVAL;230 231 memcpy(rank->dimm->label, data, copy_count);232 rank->dimm->label[copy_count] = '\0';233 234 return count;235}236 237/* show function for dynamic chX_ce_count attribute */238static ssize_t channel_ce_count_show(struct device *dev,239 struct device_attribute *mattr, char *data)240{241 struct csrow_info *csrow = to_csrow(dev);242 unsigned int chan = to_channel(mattr);243 struct rank_info *rank = csrow->channels[chan];244 245 return sysfs_emit(data, "%u\n", rank->ce_count);246}247 248/* cwrow<id>/attribute files */249DEVICE_ATTR_LEGACY(size_mb, S_IRUGO, csrow_size_show, NULL);250DEVICE_ATTR_LEGACY(dev_type, S_IRUGO, csrow_dev_type_show, NULL);251DEVICE_ATTR_LEGACY(mem_type, S_IRUGO, csrow_mem_type_show, NULL);252DEVICE_ATTR_LEGACY(edac_mode, S_IRUGO, csrow_edac_mode_show, NULL);253DEVICE_ATTR_LEGACY(ue_count, S_IRUGO, csrow_ue_count_show, NULL);254DEVICE_ATTR_LEGACY(ce_count, S_IRUGO, csrow_ce_count_show, NULL);255 256/* default attributes of the CSROW<id> object */257static struct attribute *csrow_attrs[] = {258 &dev_attr_legacy_dev_type.attr,259 &dev_attr_legacy_mem_type.attr,260 &dev_attr_legacy_edac_mode.attr,261 &dev_attr_legacy_size_mb.attr,262 &dev_attr_legacy_ue_count.attr,263 &dev_attr_legacy_ce_count.attr,264 NULL,265};266 267static const struct attribute_group csrow_attr_grp = {268 .attrs = csrow_attrs,269};270 271static const struct attribute_group *csrow_attr_groups[] = {272 &csrow_attr_grp,273 NULL274};275 276static const struct device_type csrow_attr_type = {277 .groups = csrow_attr_groups,278};279 280/*281 * possible dynamic channel DIMM Label attribute files282 *283 */284DEVICE_CHANNEL(ch0_dimm_label, S_IRUGO | S_IWUSR,285 channel_dimm_label_show, channel_dimm_label_store, 0);286DEVICE_CHANNEL(ch1_dimm_label, S_IRUGO | S_IWUSR,287 channel_dimm_label_show, channel_dimm_label_store, 1);288DEVICE_CHANNEL(ch2_dimm_label, S_IRUGO | S_IWUSR,289 channel_dimm_label_show, channel_dimm_label_store, 2);290DEVICE_CHANNEL(ch3_dimm_label, S_IRUGO | S_IWUSR,291 channel_dimm_label_show, channel_dimm_label_store, 3);292DEVICE_CHANNEL(ch4_dimm_label, S_IRUGO | S_IWUSR,293 channel_dimm_label_show, channel_dimm_label_store, 4);294DEVICE_CHANNEL(ch5_dimm_label, S_IRUGO | S_IWUSR,295 channel_dimm_label_show, channel_dimm_label_store, 5);296DEVICE_CHANNEL(ch6_dimm_label, S_IRUGO | S_IWUSR,297 channel_dimm_label_show, channel_dimm_label_store, 6);298DEVICE_CHANNEL(ch7_dimm_label, S_IRUGO | S_IWUSR,299 channel_dimm_label_show, channel_dimm_label_store, 7);300DEVICE_CHANNEL(ch8_dimm_label, S_IRUGO | S_IWUSR,301 channel_dimm_label_show, channel_dimm_label_store, 8);302DEVICE_CHANNEL(ch9_dimm_label, S_IRUGO | S_IWUSR,303 channel_dimm_label_show, channel_dimm_label_store, 9);304DEVICE_CHANNEL(ch10_dimm_label, S_IRUGO | S_IWUSR,305 channel_dimm_label_show, channel_dimm_label_store, 10);306DEVICE_CHANNEL(ch11_dimm_label, S_IRUGO | S_IWUSR,307 channel_dimm_label_show, channel_dimm_label_store, 11);308 309/* Total possible dynamic DIMM Label attribute file table */310static struct attribute *dynamic_csrow_dimm_attr[] = {311 &dev_attr_legacy_ch0_dimm_label.attr.attr,312 &dev_attr_legacy_ch1_dimm_label.attr.attr,313 &dev_attr_legacy_ch2_dimm_label.attr.attr,314 &dev_attr_legacy_ch3_dimm_label.attr.attr,315 &dev_attr_legacy_ch4_dimm_label.attr.attr,316 &dev_attr_legacy_ch5_dimm_label.attr.attr,317 &dev_attr_legacy_ch6_dimm_label.attr.attr,318 &dev_attr_legacy_ch7_dimm_label.attr.attr,319 &dev_attr_legacy_ch8_dimm_label.attr.attr,320 &dev_attr_legacy_ch9_dimm_label.attr.attr,321 &dev_attr_legacy_ch10_dimm_label.attr.attr,322 &dev_attr_legacy_ch11_dimm_label.attr.attr,323 NULL324};325 326/* possible dynamic channel ce_count attribute files */327DEVICE_CHANNEL(ch0_ce_count, S_IRUGO,328 channel_ce_count_show, NULL, 0);329DEVICE_CHANNEL(ch1_ce_count, S_IRUGO,330 channel_ce_count_show, NULL, 1);331DEVICE_CHANNEL(ch2_ce_count, S_IRUGO,332 channel_ce_count_show, NULL, 2);333DEVICE_CHANNEL(ch3_ce_count, S_IRUGO,334 channel_ce_count_show, NULL, 3);335DEVICE_CHANNEL(ch4_ce_count, S_IRUGO,336 channel_ce_count_show, NULL, 4);337DEVICE_CHANNEL(ch5_ce_count, S_IRUGO,338 channel_ce_count_show, NULL, 5);339DEVICE_CHANNEL(ch6_ce_count, S_IRUGO,340 channel_ce_count_show, NULL, 6);341DEVICE_CHANNEL(ch7_ce_count, S_IRUGO,342 channel_ce_count_show, NULL, 7);343DEVICE_CHANNEL(ch8_ce_count, S_IRUGO,344 channel_ce_count_show, NULL, 8);345DEVICE_CHANNEL(ch9_ce_count, S_IRUGO,346 channel_ce_count_show, NULL, 9);347DEVICE_CHANNEL(ch10_ce_count, S_IRUGO,348 channel_ce_count_show, NULL, 10);349DEVICE_CHANNEL(ch11_ce_count, S_IRUGO,350 channel_ce_count_show, NULL, 11);351 352/* Total possible dynamic ce_count attribute file table */353static struct attribute *dynamic_csrow_ce_count_attr[] = {354 &dev_attr_legacy_ch0_ce_count.attr.attr,355 &dev_attr_legacy_ch1_ce_count.attr.attr,356 &dev_attr_legacy_ch2_ce_count.attr.attr,357 &dev_attr_legacy_ch3_ce_count.attr.attr,358 &dev_attr_legacy_ch4_ce_count.attr.attr,359 &dev_attr_legacy_ch5_ce_count.attr.attr,360 &dev_attr_legacy_ch6_ce_count.attr.attr,361 &dev_attr_legacy_ch7_ce_count.attr.attr,362 &dev_attr_legacy_ch8_ce_count.attr.attr,363 &dev_attr_legacy_ch9_ce_count.attr.attr,364 &dev_attr_legacy_ch10_ce_count.attr.attr,365 &dev_attr_legacy_ch11_ce_count.attr.attr,366 NULL367};368 369static umode_t csrow_dev_is_visible(struct kobject *kobj,370 struct attribute *attr, int idx)371{372 struct device *dev = kobj_to_dev(kobj);373 struct csrow_info *csrow = container_of(dev, struct csrow_info, dev);374 375 if (idx >= csrow->nr_channels)376 return 0;377 378 if (idx >= ARRAY_SIZE(dynamic_csrow_ce_count_attr) - 1) {379 WARN_ONCE(1, "idx: %d\n", idx);380 return 0;381 }382 383 /* Only expose populated DIMMs */384 if (!csrow->channels[idx]->dimm->nr_pages)385 return 0;386 387 return attr->mode;388}389 390 391static const struct attribute_group csrow_dev_dimm_group = {392 .attrs = dynamic_csrow_dimm_attr,393 .is_visible = csrow_dev_is_visible,394};395 396static const struct attribute_group csrow_dev_ce_count_group = {397 .attrs = dynamic_csrow_ce_count_attr,398 .is_visible = csrow_dev_is_visible,399};400 401static const struct attribute_group *csrow_dev_groups[] = {402 &csrow_dev_dimm_group,403 &csrow_dev_ce_count_group,404 NULL405};406 407static void csrow_release(struct device *dev)408{409 /*410 * Nothing to do, just unregister sysfs here. The mci411 * device owns the data and will also release it.412 */413}414 415static inline int nr_pages_per_csrow(struct csrow_info *csrow)416{417 int chan, nr_pages = 0;418 419 for (chan = 0; chan < csrow->nr_channels; chan++)420 nr_pages += csrow->channels[chan]->dimm->nr_pages;421 422 return nr_pages;423}424 425/* Create a CSROW object under specifed edac_mc_device */426static int edac_create_csrow_object(struct mem_ctl_info *mci,427 struct csrow_info *csrow, int index)428{429 int err;430 431 csrow->dev.type = &csrow_attr_type;432 csrow->dev.groups = csrow_dev_groups;433 csrow->dev.release = csrow_release;434 device_initialize(&csrow->dev);435 csrow->dev.parent = &mci->dev;436 csrow->mci = mci;437 dev_set_name(&csrow->dev, "csrow%d", index);438 dev_set_drvdata(&csrow->dev, csrow);439 440 err = device_add(&csrow->dev);441 if (err) {442 edac_dbg(1, "failure: create device %s\n", dev_name(&csrow->dev));443 put_device(&csrow->dev);444 return err;445 }446 447 edac_dbg(0, "device %s created\n", dev_name(&csrow->dev));448 449 return 0;450}451 452/* Create a CSROW object under specifed edac_mc_device */453static int edac_create_csrow_objects(struct mem_ctl_info *mci)454{455 int err, i;456 struct csrow_info *csrow;457 458 for (i = 0; i < mci->nr_csrows; i++) {459 csrow = mci->csrows[i];460 if (!nr_pages_per_csrow(csrow))461 continue;462 err = edac_create_csrow_object(mci, mci->csrows[i], i);463 if (err < 0)464 goto error;465 }466 return 0;467 468error:469 for (--i; i >= 0; i--) {470 if (device_is_registered(&mci->csrows[i]->dev))471 device_unregister(&mci->csrows[i]->dev);472 }473 474 return err;475}476 477static void edac_delete_csrow_objects(struct mem_ctl_info *mci)478{479 int i;480 481 for (i = 0; i < mci->nr_csrows; i++) {482 if (device_is_registered(&mci->csrows[i]->dev))483 device_unregister(&mci->csrows[i]->dev);484 }485}486 487#endif488 489/*490 * Per-dimm (or per-rank) devices491 */492 493#define to_dimm(k) container_of(k, struct dimm_info, dev)494 495/* show/store functions for DIMM Label attributes */496static ssize_t dimmdev_location_show(struct device *dev,497 struct device_attribute *mattr, char *data)498{499 struct dimm_info *dimm = to_dimm(dev);500 ssize_t count;501 502 count = edac_dimm_info_location(dimm, data, PAGE_SIZE);503 count += scnprintf(data + count, PAGE_SIZE - count, "\n");504 505 return count;506}507 508static ssize_t dimmdev_label_show(struct device *dev,509 struct device_attribute *mattr, char *data)510{511 struct dimm_info *dimm = to_dimm(dev);512 513 /* if field has not been initialized, there is nothing to send */514 if (!dimm->label[0])515 return 0;516 517 return sysfs_emit(data, "%s\n", dimm->label);518}519 520static ssize_t dimmdev_label_store(struct device *dev,521 struct device_attribute *mattr,522 const char *data,523 size_t count)524{525 struct dimm_info *dimm = to_dimm(dev);526 size_t copy_count = count;527 528 if (count == 0)529 return -EINVAL;530 531 if (data[count - 1] == '\0' || data[count - 1] == '\n')532 copy_count -= 1;533 534 if (copy_count == 0 || copy_count >= sizeof(dimm->label))535 return -EINVAL;536 537 memcpy(dimm->label, data, copy_count);538 dimm->label[copy_count] = '\0';539 540 return count;541}542 543static ssize_t dimmdev_size_show(struct device *dev,544 struct device_attribute *mattr, char *data)545{546 struct dimm_info *dimm = to_dimm(dev);547 548 return sysfs_emit(data, "%u\n", PAGES_TO_MiB(dimm->nr_pages));549}550 551static ssize_t dimmdev_mem_type_show(struct device *dev,552 struct device_attribute *mattr, char *data)553{554 struct dimm_info *dimm = to_dimm(dev);555 556 return sysfs_emit(data, "%s\n", edac_mem_types[dimm->mtype]);557}558 559static ssize_t dimmdev_dev_type_show(struct device *dev,560 struct device_attribute *mattr, char *data)561{562 struct dimm_info *dimm = to_dimm(dev);563 564 return sysfs_emit(data, "%s\n", dev_types[dimm->dtype]);565}566 567static ssize_t dimmdev_edac_mode_show(struct device *dev,568 struct device_attribute *mattr,569 char *data)570{571 struct dimm_info *dimm = to_dimm(dev);572 573 return sysfs_emit(data, "%s\n", edac_caps[dimm->edac_mode]);574}575 576static ssize_t dimmdev_ce_count_show(struct device *dev,577 struct device_attribute *mattr,578 char *data)579{580 struct dimm_info *dimm = to_dimm(dev);581 582 return sysfs_emit(data, "%u\n", dimm->ce_count);583}584 585static ssize_t dimmdev_ue_count_show(struct device *dev,586 struct device_attribute *mattr,587 char *data)588{589 struct dimm_info *dimm = to_dimm(dev);590 591 return sysfs_emit(data, "%u\n", dimm->ue_count);592}593 594/* dimm/rank attribute files */595static DEVICE_ATTR(dimm_label, S_IRUGO | S_IWUSR,596 dimmdev_label_show, dimmdev_label_store);597static DEVICE_ATTR(dimm_location, S_IRUGO, dimmdev_location_show, NULL);598static DEVICE_ATTR(size, S_IRUGO, dimmdev_size_show, NULL);599static DEVICE_ATTR(dimm_mem_type, S_IRUGO, dimmdev_mem_type_show, NULL);600static DEVICE_ATTR(dimm_dev_type, S_IRUGO, dimmdev_dev_type_show, NULL);601static DEVICE_ATTR(dimm_edac_mode, S_IRUGO, dimmdev_edac_mode_show, NULL);602static DEVICE_ATTR(dimm_ce_count, S_IRUGO, dimmdev_ce_count_show, NULL);603static DEVICE_ATTR(dimm_ue_count, S_IRUGO, dimmdev_ue_count_show, NULL);604 605/* attributes of the dimm<id>/rank<id> object */606static struct attribute *dimm_attrs[] = {607 &dev_attr_dimm_label.attr,608 &dev_attr_dimm_location.attr,609 &dev_attr_size.attr,610 &dev_attr_dimm_mem_type.attr,611 &dev_attr_dimm_dev_type.attr,612 &dev_attr_dimm_edac_mode.attr,613 &dev_attr_dimm_ce_count.attr,614 &dev_attr_dimm_ue_count.attr,615 NULL,616};617 618static const struct attribute_group dimm_attr_grp = {619 .attrs = dimm_attrs,620};621 622static const struct attribute_group *dimm_attr_groups[] = {623 &dimm_attr_grp,624 NULL625};626 627static const struct device_type dimm_attr_type = {628 .groups = dimm_attr_groups,629};630 631static void dimm_release(struct device *dev)632{633 /*634 * Nothing to do, just unregister sysfs here. The mci635 * device owns the data and will also release it.636 */637}638 639/* Create a DIMM object under specifed memory controller device */640static int edac_create_dimm_object(struct mem_ctl_info *mci,641 struct dimm_info *dimm)642{643 int err;644 dimm->mci = mci;645 646 dimm->dev.type = &dimm_attr_type;647 dimm->dev.release = dimm_release;648 device_initialize(&dimm->dev);649 650 dimm->dev.parent = &mci->dev;651 if (mci->csbased)652 dev_set_name(&dimm->dev, "rank%d", dimm->idx);653 else654 dev_set_name(&dimm->dev, "dimm%d", dimm->idx);655 dev_set_drvdata(&dimm->dev, dimm);656 pm_runtime_forbid(&mci->dev);657 658 err = device_add(&dimm->dev);659 if (err) {660 edac_dbg(1, "failure: create device %s\n", dev_name(&dimm->dev));661 put_device(&dimm->dev);662 return err;663 }664 665 if (IS_ENABLED(CONFIG_EDAC_DEBUG)) {666 char location[80];667 668 edac_dimm_info_location(dimm, location, sizeof(location));669 edac_dbg(0, "device %s created at location %s\n",670 dev_name(&dimm->dev), location);671 }672 673 return 0;674}675 676/*677 * Memory controller device678 */679 680#define to_mci(k) container_of(k, struct mem_ctl_info, dev)681 682static ssize_t mci_reset_counters_store(struct device *dev,683 struct device_attribute *mattr,684 const char *data, size_t count)685{686 struct mem_ctl_info *mci = to_mci(dev);687 struct dimm_info *dimm;688 int row, chan;689 690 mci->ue_mc = 0;691 mci->ce_mc = 0;692 mci->ue_noinfo_count = 0;693 mci->ce_noinfo_count = 0;694 695 for (row = 0; row < mci->nr_csrows; row++) {696 struct csrow_info *ri = mci->csrows[row];697 698 ri->ue_count = 0;699 ri->ce_count = 0;700 701 for (chan = 0; chan < ri->nr_channels; chan++)702 ri->channels[chan]->ce_count = 0;703 }704 705 mci_for_each_dimm(mci, dimm) {706 dimm->ue_count = 0;707 dimm->ce_count = 0;708 }709 710 mci->start_time = jiffies;711 return count;712}713 714/* Memory scrubbing interface:715 *716 * A MC driver can limit the scrubbing bandwidth based on the CPU type.717 * Therefore, ->set_sdram_scrub_rate should be made to return the actual718 * bandwidth that is accepted or 0 when scrubbing is to be disabled.719 *720 * Negative value still means that an error has occurred while setting721 * the scrub rate.722 */723static ssize_t mci_sdram_scrub_rate_store(struct device *dev,724 struct device_attribute *mattr,725 const char *data, size_t count)726{727 struct mem_ctl_info *mci = to_mci(dev);728 unsigned long bandwidth = 0;729 int new_bw = 0;730 731 if (kstrtoul(data, 10, &bandwidth) < 0)732 return -EINVAL;733 734 new_bw = mci->set_sdram_scrub_rate(mci, bandwidth);735 if (new_bw < 0) {736 edac_printk(KERN_WARNING, EDAC_MC,737 "Error setting scrub rate to: %lu\n", bandwidth);738 return -EINVAL;739 }740 741 return count;742}743 744/*745 * ->get_sdram_scrub_rate() return value semantics same as above.746 */747static ssize_t mci_sdram_scrub_rate_show(struct device *dev,748 struct device_attribute *mattr,749 char *data)750{751 struct mem_ctl_info *mci = to_mci(dev);752 int bandwidth = 0;753 754 bandwidth = mci->get_sdram_scrub_rate(mci);755 if (bandwidth < 0) {756 edac_printk(KERN_DEBUG, EDAC_MC, "Error reading scrub rate\n");757 return bandwidth;758 }759 760 return sysfs_emit(data, "%d\n", bandwidth);761}762 763/* default attribute files for the MCI object */764static ssize_t mci_ue_count_show(struct device *dev,765 struct device_attribute *mattr,766 char *data)767{768 struct mem_ctl_info *mci = to_mci(dev);769 770 return sysfs_emit(data, "%u\n", mci->ue_mc);771}772 773static ssize_t mci_ce_count_show(struct device *dev,774 struct device_attribute *mattr,775 char *data)776{777 struct mem_ctl_info *mci = to_mci(dev);778 779 return sysfs_emit(data, "%u\n", mci->ce_mc);780}781 782static ssize_t mci_ce_noinfo_show(struct device *dev,783 struct device_attribute *mattr,784 char *data)785{786 struct mem_ctl_info *mci = to_mci(dev);787 788 return sysfs_emit(data, "%u\n", mci->ce_noinfo_count);789}790 791static ssize_t mci_ue_noinfo_show(struct device *dev,792 struct device_attribute *mattr,793 char *data)794{795 struct mem_ctl_info *mci = to_mci(dev);796 797 return sysfs_emit(data, "%u\n", mci->ue_noinfo_count);798}799 800static ssize_t mci_seconds_show(struct device *dev,801 struct device_attribute *mattr,802 char *data)803{804 struct mem_ctl_info *mci = to_mci(dev);805 806 return sysfs_emit(data, "%ld\n", (jiffies - mci->start_time) / HZ);807}808 809static ssize_t mci_ctl_name_show(struct device *dev,810 struct device_attribute *mattr,811 char *data)812{813 struct mem_ctl_info *mci = to_mci(dev);814 815 return sysfs_emit(data, "%s\n", mci->ctl_name);816}817 818static ssize_t mci_size_mb_show(struct device *dev,819 struct device_attribute *mattr,820 char *data)821{822 struct mem_ctl_info *mci = to_mci(dev);823 int total_pages = 0, csrow_idx, j;824 825 for (csrow_idx = 0; csrow_idx < mci->nr_csrows; csrow_idx++) {826 struct csrow_info *csrow = mci->csrows[csrow_idx];827 828 for (j = 0; j < csrow->nr_channels; j++) {829 struct dimm_info *dimm = csrow->channels[j]->dimm;830 831 total_pages += dimm->nr_pages;832 }833 }834 835 return sysfs_emit(data, "%u\n", PAGES_TO_MiB(total_pages));836}837 838static ssize_t mci_max_location_show(struct device *dev,839 struct device_attribute *mattr,840 char *data)841{842 struct mem_ctl_info *mci = to_mci(dev);843 int len = PAGE_SIZE;844 char *p = data;845 int i, n;846 847 for (i = 0; i < mci->n_layers; i++) {848 n = scnprintf(p, len, "%s %d ",849 edac_layer_name[mci->layers[i].type],850 mci->layers[i].size - 1);851 len -= n;852 if (len <= 0)853 goto out;854 855 p += n;856 }857 858 p += scnprintf(p, len, "\n");859out:860 return p - data;861}862 863/* default Control file */864static DEVICE_ATTR(reset_counters, S_IWUSR, NULL, mci_reset_counters_store);865 866/* default Attribute files */867static DEVICE_ATTR(mc_name, S_IRUGO, mci_ctl_name_show, NULL);868static DEVICE_ATTR(size_mb, S_IRUGO, mci_size_mb_show, NULL);869static DEVICE_ATTR(seconds_since_reset, S_IRUGO, mci_seconds_show, NULL);870static DEVICE_ATTR(ue_noinfo_count, S_IRUGO, mci_ue_noinfo_show, NULL);871static DEVICE_ATTR(ce_noinfo_count, S_IRUGO, mci_ce_noinfo_show, NULL);872static DEVICE_ATTR(ue_count, S_IRUGO, mci_ue_count_show, NULL);873static DEVICE_ATTR(ce_count, S_IRUGO, mci_ce_count_show, NULL);874static DEVICE_ATTR(max_location, S_IRUGO, mci_max_location_show, NULL);875 876/* memory scrubber attribute file */877static DEVICE_ATTR(sdram_scrub_rate, 0, mci_sdram_scrub_rate_show,878 mci_sdram_scrub_rate_store); /* umode set later in is_visible */879 880static struct attribute *mci_attrs[] = {881 &dev_attr_reset_counters.attr,882 &dev_attr_mc_name.attr,883 &dev_attr_size_mb.attr,884 &dev_attr_seconds_since_reset.attr,885 &dev_attr_ue_noinfo_count.attr,886 &dev_attr_ce_noinfo_count.attr,887 &dev_attr_ue_count.attr,888 &dev_attr_ce_count.attr,889 &dev_attr_max_location.attr,890 &dev_attr_sdram_scrub_rate.attr,891 NULL892};893 894static umode_t mci_attr_is_visible(struct kobject *kobj,895 struct attribute *attr, int idx)896{897 struct device *dev = kobj_to_dev(kobj);898 struct mem_ctl_info *mci = to_mci(dev);899 umode_t mode = 0;900 901 if (attr != &dev_attr_sdram_scrub_rate.attr)902 return attr->mode;903 if (mci->get_sdram_scrub_rate)904 mode |= S_IRUGO;905 if (mci->set_sdram_scrub_rate)906 mode |= S_IWUSR;907 return mode;908}909 910static const struct attribute_group mci_attr_grp = {911 .attrs = mci_attrs,912 .is_visible = mci_attr_is_visible,913};914 915static const struct attribute_group *mci_attr_groups[] = {916 &mci_attr_grp,917 NULL918};919 920static const struct device_type mci_attr_type = {921 .groups = mci_attr_groups,922};923 924/*925 * Create a new Memory Controller kobject instance,926 * mc<id> under the 'mc' directory927 *928 * Return:929 * 0 Success930 * !0 Failure931 */932int edac_create_sysfs_mci_device(struct mem_ctl_info *mci,933 const struct attribute_group **groups)934{935 struct dimm_info *dimm;936 int err;937 938 /* get the /sys/devices/system/edac subsys reference */939 mci->dev.type = &mci_attr_type;940 mci->dev.parent = mci_pdev;941 mci->dev.groups = groups;942 dev_set_name(&mci->dev, "mc%d", mci->mc_idx);943 dev_set_drvdata(&mci->dev, mci);944 pm_runtime_forbid(&mci->dev);945 946 err = device_add(&mci->dev);947 if (err < 0) {948 edac_dbg(1, "failure: create device %s\n", dev_name(&mci->dev));949 /* no put_device() here, free mci with _edac_mc_free() */950 return err;951 }952 953 edac_dbg(0, "device %s created\n", dev_name(&mci->dev));954 955 /*956 * Create the dimm/rank devices957 */958 mci_for_each_dimm(mci, dimm) {959 /* Only expose populated DIMMs */960 if (!dimm->nr_pages)961 continue;962 963 err = edac_create_dimm_object(mci, dimm);964 if (err)965 goto fail;966 }967 968#ifdef CONFIG_EDAC_LEGACY_SYSFS969 err = edac_create_csrow_objects(mci);970 if (err < 0)971 goto fail;972#endif973 974 edac_create_debugfs_nodes(mci);975 return 0;976 977fail:978 edac_remove_sysfs_mci_device(mci);979 980 return err;981}982 983/*984 * remove a Memory Controller instance985 */986void edac_remove_sysfs_mci_device(struct mem_ctl_info *mci)987{988 struct dimm_info *dimm;989 990 if (!device_is_registered(&mci->dev))991 return;992 993 edac_dbg(0, "\n");994 995#ifdef CONFIG_EDAC_DEBUG996 edac_debugfs_remove_recursive(mci->debugfs);997#endif998#ifdef CONFIG_EDAC_LEGACY_SYSFS999 edac_delete_csrow_objects(mci);1000#endif1001 1002 mci_for_each_dimm(mci, dimm) {1003 if (!device_is_registered(&dimm->dev))1004 continue;1005 edac_dbg(1, "unregistering device %s\n", dev_name(&dimm->dev));1006 device_unregister(&dimm->dev);1007 }1008 1009 /* only remove the device, but keep mci */1010 device_del(&mci->dev);1011}1012 1013static void mc_attr_release(struct device *dev)1014{1015 /*1016 * There's no container structure here, as this is just the mci1017 * parent device, used to create the /sys/devices/mc sysfs node.1018 * So, there are no attributes on it.1019 */1020 edac_dbg(1, "device %s released\n", dev_name(dev));1021 kfree(dev);1022}1023 1024/*1025 * Init/exit code for the module. Basically, creates/removes /sys/class/rc1026 */1027int __init edac_mc_sysfs_init(void)1028{1029 int err;1030 1031 mci_pdev = kzalloc(sizeof(*mci_pdev), GFP_KERNEL);1032 if (!mci_pdev)1033 return -ENOMEM;1034 1035 mci_pdev->bus = edac_get_sysfs_subsys();1036 mci_pdev->release = mc_attr_release;1037 mci_pdev->init_name = "mc";1038 1039 err = device_register(mci_pdev);1040 if (err < 0) {1041 edac_dbg(1, "failure: create device %s\n", dev_name(mci_pdev));1042 put_device(mci_pdev);1043 return err;1044 }1045 1046 edac_dbg(0, "device %s created\n", dev_name(mci_pdev));1047 1048 return 0;1049}1050 1051void edac_mc_sysfs_exit(void)1052{1053 device_unregister(mci_pdev);1054}1055