2 * edac_mc kernel module
3 * (C) 2005-2007 Linux Networx (http://lnxi.com)
5 * This file may be distributed under the terms of the
6 * GNU General Public License.
8 * Written Doug Thompson <norsk5@xmission.com> www.softwarebitmaker.com
10 * (c) 2012-2013 - Mauro Carvalho Chehab
11 * The entire API were re-written, and ported to use struct device
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>
23 #include "edac_module.h"
25 /* MC EDAC Controls, setable by module parameter, and sysfs */
26 static int edac_mc_log_ue = 1;
27 static int edac_mc_log_ce = 1;
28 static int edac_mc_panic_on_ue;
29 static unsigned int edac_mc_poll_msec = 1000;
31 /* Getter functions for above */
32 int edac_mc_get_log_ue(void)
34 return edac_mc_log_ue;
37 int edac_mc_get_log_ce(void)
39 return edac_mc_log_ce;
42 int edac_mc_get_panic_on_ue(void)
44 return edac_mc_panic_on_ue;
47 /* this is temporary */
48 unsigned int edac_mc_get_poll_msec(void)
50 return edac_mc_poll_msec;
53 static int edac_set_poll_msec(const char *val, struct kernel_param *kp)
61 ret = kstrtouint(val, 0, &i);
68 *((unsigned int *)kp->arg) = i;
70 /* notify edac_mc engine to reset the poll period */
71 edac_mc_reset_delay_period(i);
76 /* Parameter declarations for above */
77 module_param(edac_mc_panic_on_ue, int, 0644);
78 MODULE_PARM_DESC(edac_mc_panic_on_ue, "Panic on uncorrected error: 0=off 1=on");
79 module_param(edac_mc_log_ue, int, 0644);
80 MODULE_PARM_DESC(edac_mc_log_ue,
81 "Log uncorrectable error to console: 0=off 1=on");
82 module_param(edac_mc_log_ce, int, 0644);
83 MODULE_PARM_DESC(edac_mc_log_ce,
84 "Log correctable error to console: 0=off 1=on");
85 module_param_call(edac_mc_poll_msec, edac_set_poll_msec, param_get_uint,
86 &edac_mc_poll_msec, 0644);
87 MODULE_PARM_DESC(edac_mc_poll_msec, "Polling period in milliseconds");
89 static struct device *mci_pdev;
92 * various constants for Memory Controllers
94 static const char * const mem_types[] = {
95 [MEM_EMPTY] = "Empty",
96 [MEM_RESERVED] = "Reserved",
97 [MEM_UNKNOWN] = "Unknown",
101 [MEM_SDR] = "Unbuffered-SDR",
102 [MEM_RDR] = "Registered-SDR",
103 [MEM_DDR] = "Unbuffered-DDR",
104 [MEM_RDDR] = "Registered-DDR",
106 [MEM_DDR2] = "Unbuffered-DDR2",
107 [MEM_FB_DDR2] = "FullyBuffered-DDR2",
108 [MEM_RDDR2] = "Registered-DDR2",
110 [MEM_DDR3] = "Unbuffered-DDR3",
111 [MEM_RDDR3] = "Registered-DDR3",
112 [MEM_DDR4] = "Unbuffered-DDR4",
113 [MEM_RDDR4] = "Registered-DDR4"
116 static const char * const dev_types[] = {
117 [DEV_UNKNOWN] = "Unknown",
127 static const char * const edac_caps[] = {
128 [EDAC_UNKNOWN] = "Unknown",
129 [EDAC_NONE] = "None",
130 [EDAC_RESERVED] = "Reserved",
131 [EDAC_PARITY] = "PARITY",
133 [EDAC_SECDED] = "SECDED",
134 [EDAC_S2ECD2ED] = "S2ECD2ED",
135 [EDAC_S4ECD4ED] = "S4ECD4ED",
136 [EDAC_S8ECD8ED] = "S8ECD8ED",
137 [EDAC_S16ECD16ED] = "S16ECD16ED"
140 #ifdef CONFIG_EDAC_LEGACY_SYSFS
142 * EDAC sysfs CSROW data structures and methods
145 #define to_csrow(k) container_of(k, struct csrow_info, dev)
148 * We need it to avoid namespace conflicts between the legacy API
149 * and the per-dimm/per-rank one
151 #define DEVICE_ATTR_LEGACY(_name, _mode, _show, _store) \
152 static struct device_attribute dev_attr_legacy_##_name = __ATTR(_name, _mode, _show, _store)
154 struct dev_ch_attribute {
155 struct device_attribute attr;
159 #define DEVICE_CHANNEL(_name, _mode, _show, _store, _var) \
160 static struct dev_ch_attribute dev_attr_legacy_##_name = \
161 { __ATTR(_name, _mode, _show, _store), (_var) }
163 #define to_channel(k) (container_of(k, struct dev_ch_attribute, attr)->channel)
165 /* Set of more default csrow<id> attribute show/store functions */
166 static ssize_t csrow_ue_count_show(struct device *dev,
167 struct device_attribute *mattr, char *data)
169 struct csrow_info *csrow = to_csrow(dev);
171 return sprintf(data, "%u\n", csrow->ue_count);
174 static ssize_t csrow_ce_count_show(struct device *dev,
175 struct device_attribute *mattr, char *data)
177 struct csrow_info *csrow = to_csrow(dev);
179 return sprintf(data, "%u\n", csrow->ce_count);
182 static ssize_t csrow_size_show(struct device *dev,
183 struct device_attribute *mattr, char *data)
185 struct csrow_info *csrow = to_csrow(dev);
189 for (i = 0; i < csrow->nr_channels; i++)
190 nr_pages += csrow->channels[i]->dimm->nr_pages;
191 return sprintf(data, "%u\n", PAGES_TO_MiB(nr_pages));
194 static ssize_t csrow_mem_type_show(struct device *dev,
195 struct device_attribute *mattr, char *data)
197 struct csrow_info *csrow = to_csrow(dev);
199 return sprintf(data, "%s\n", mem_types[csrow->channels[0]->dimm->mtype]);
202 static ssize_t csrow_dev_type_show(struct device *dev,
203 struct device_attribute *mattr, char *data)
205 struct csrow_info *csrow = to_csrow(dev);
207 return sprintf(data, "%s\n", dev_types[csrow->channels[0]->dimm->dtype]);
210 static ssize_t csrow_edac_mode_show(struct device *dev,
211 struct device_attribute *mattr,
214 struct csrow_info *csrow = to_csrow(dev);
216 return sprintf(data, "%s\n", edac_caps[csrow->channels[0]->dimm->edac_mode]);
219 /* show/store functions for DIMM Label attributes */
220 static ssize_t channel_dimm_label_show(struct device *dev,
221 struct device_attribute *mattr,
224 struct csrow_info *csrow = to_csrow(dev);
225 unsigned chan = to_channel(mattr);
226 struct rank_info *rank = csrow->channels[chan];
228 /* if field has not been initialized, there is nothing to send */
229 if (!rank->dimm->label[0])
232 return snprintf(data, sizeof(rank->dimm->label) + 1, "%s\n",
236 static ssize_t channel_dimm_label_store(struct device *dev,
237 struct device_attribute *mattr,
238 const char *data, size_t count)
240 struct csrow_info *csrow = to_csrow(dev);
241 unsigned chan = to_channel(mattr);
242 struct rank_info *rank = csrow->channels[chan];
243 size_t copy_count = count;
248 if (data[count - 1] == '\0' || data[count - 1] == '\n')
251 if (copy_count == 0 || copy_count >= sizeof(rank->dimm->label))
254 strncpy(rank->dimm->label, data, copy_count);
255 rank->dimm->label[copy_count] = '\0';
260 /* show function for dynamic chX_ce_count attribute */
261 static ssize_t channel_ce_count_show(struct device *dev,
262 struct device_attribute *mattr, char *data)
264 struct csrow_info *csrow = to_csrow(dev);
265 unsigned chan = to_channel(mattr);
266 struct rank_info *rank = csrow->channels[chan];
268 return sprintf(data, "%u\n", rank->ce_count);
271 /* cwrow<id>/attribute files */
272 DEVICE_ATTR_LEGACY(size_mb, S_IRUGO, csrow_size_show, NULL);
273 DEVICE_ATTR_LEGACY(dev_type, S_IRUGO, csrow_dev_type_show, NULL);
274 DEVICE_ATTR_LEGACY(mem_type, S_IRUGO, csrow_mem_type_show, NULL);
275 DEVICE_ATTR_LEGACY(edac_mode, S_IRUGO, csrow_edac_mode_show, NULL);
276 DEVICE_ATTR_LEGACY(ue_count, S_IRUGO, csrow_ue_count_show, NULL);
277 DEVICE_ATTR_LEGACY(ce_count, S_IRUGO, csrow_ce_count_show, NULL);
279 /* default attributes of the CSROW<id> object */
280 static struct attribute *csrow_attrs[] = {
281 &dev_attr_legacy_dev_type.attr,
282 &dev_attr_legacy_mem_type.attr,
283 &dev_attr_legacy_edac_mode.attr,
284 &dev_attr_legacy_size_mb.attr,
285 &dev_attr_legacy_ue_count.attr,
286 &dev_attr_legacy_ce_count.attr,
290 static const struct attribute_group csrow_attr_grp = {
291 .attrs = csrow_attrs,
294 static const struct attribute_group *csrow_attr_groups[] = {
299 static void csrow_attr_release(struct device *dev)
301 struct csrow_info *csrow = container_of(dev, struct csrow_info, dev);
303 edac_dbg(1, "Releasing csrow device %s\n", dev_name(dev));
307 static const struct device_type csrow_attr_type = {
308 .groups = csrow_attr_groups,
309 .release = csrow_attr_release,
313 * possible dynamic channel DIMM Label attribute files
316 DEVICE_CHANNEL(ch0_dimm_label, S_IRUGO | S_IWUSR,
317 channel_dimm_label_show, channel_dimm_label_store, 0);
318 DEVICE_CHANNEL(ch1_dimm_label, S_IRUGO | S_IWUSR,
319 channel_dimm_label_show, channel_dimm_label_store, 1);
320 DEVICE_CHANNEL(ch2_dimm_label, S_IRUGO | S_IWUSR,
321 channel_dimm_label_show, channel_dimm_label_store, 2);
322 DEVICE_CHANNEL(ch3_dimm_label, S_IRUGO | S_IWUSR,
323 channel_dimm_label_show, channel_dimm_label_store, 3);
324 DEVICE_CHANNEL(ch4_dimm_label, S_IRUGO | S_IWUSR,
325 channel_dimm_label_show, channel_dimm_label_store, 4);
326 DEVICE_CHANNEL(ch5_dimm_label, S_IRUGO | S_IWUSR,
327 channel_dimm_label_show, channel_dimm_label_store, 5);
328 DEVICE_CHANNEL(ch6_dimm_label, S_IRUGO | S_IWUSR,
329 channel_dimm_label_show, channel_dimm_label_store, 6);
330 DEVICE_CHANNEL(ch7_dimm_label, S_IRUGO | S_IWUSR,
331 channel_dimm_label_show, channel_dimm_label_store, 7);
333 /* Total possible dynamic DIMM Label attribute file table */
334 static struct attribute *dynamic_csrow_dimm_attr[] = {
335 &dev_attr_legacy_ch0_dimm_label.attr.attr,
336 &dev_attr_legacy_ch1_dimm_label.attr.attr,
337 &dev_attr_legacy_ch2_dimm_label.attr.attr,
338 &dev_attr_legacy_ch3_dimm_label.attr.attr,
339 &dev_attr_legacy_ch4_dimm_label.attr.attr,
340 &dev_attr_legacy_ch5_dimm_label.attr.attr,
341 &dev_attr_legacy_ch6_dimm_label.attr.attr,
342 &dev_attr_legacy_ch7_dimm_label.attr.attr,
346 /* possible dynamic channel ce_count attribute files */
347 DEVICE_CHANNEL(ch0_ce_count, S_IRUGO,
348 channel_ce_count_show, NULL, 0);
349 DEVICE_CHANNEL(ch1_ce_count, S_IRUGO,
350 channel_ce_count_show, NULL, 1);
351 DEVICE_CHANNEL(ch2_ce_count, S_IRUGO,
352 channel_ce_count_show, NULL, 2);
353 DEVICE_CHANNEL(ch3_ce_count, S_IRUGO,
354 channel_ce_count_show, NULL, 3);
355 DEVICE_CHANNEL(ch4_ce_count, S_IRUGO,
356 channel_ce_count_show, NULL, 4);
357 DEVICE_CHANNEL(ch5_ce_count, S_IRUGO,
358 channel_ce_count_show, NULL, 5);
359 DEVICE_CHANNEL(ch6_ce_count, S_IRUGO,
360 channel_ce_count_show, NULL, 6);
361 DEVICE_CHANNEL(ch7_ce_count, S_IRUGO,
362 channel_ce_count_show, NULL, 7);
364 /* Total possible dynamic ce_count attribute file table */
365 static struct attribute *dynamic_csrow_ce_count_attr[] = {
366 &dev_attr_legacy_ch0_ce_count.attr.attr,
367 &dev_attr_legacy_ch1_ce_count.attr.attr,
368 &dev_attr_legacy_ch2_ce_count.attr.attr,
369 &dev_attr_legacy_ch3_ce_count.attr.attr,
370 &dev_attr_legacy_ch4_ce_count.attr.attr,
371 &dev_attr_legacy_ch5_ce_count.attr.attr,
372 &dev_attr_legacy_ch6_ce_count.attr.attr,
373 &dev_attr_legacy_ch7_ce_count.attr.attr,
377 static umode_t csrow_dev_is_visible(struct kobject *kobj,
378 struct attribute *attr, int idx)
380 struct device *dev = kobj_to_dev(kobj);
381 struct csrow_info *csrow = container_of(dev, struct csrow_info, dev);
383 if (idx >= csrow->nr_channels)
386 if (idx >= ARRAY_SIZE(dynamic_csrow_ce_count_attr) - 1) {
387 WARN_ONCE(1, "idx: %d\n", idx);
391 /* Only expose populated DIMMs */
392 if (!csrow->channels[idx]->dimm->nr_pages)
399 static const struct attribute_group csrow_dev_dimm_group = {
400 .attrs = dynamic_csrow_dimm_attr,
401 .is_visible = csrow_dev_is_visible,
404 static const struct attribute_group csrow_dev_ce_count_group = {
405 .attrs = dynamic_csrow_ce_count_attr,
406 .is_visible = csrow_dev_is_visible,
409 static const struct attribute_group *csrow_dev_groups[] = {
410 &csrow_dev_dimm_group,
411 &csrow_dev_ce_count_group,
415 static inline int nr_pages_per_csrow(struct csrow_info *csrow)
417 int chan, nr_pages = 0;
419 for (chan = 0; chan < csrow->nr_channels; chan++)
420 nr_pages += csrow->channels[chan]->dimm->nr_pages;
425 /* Create a CSROW object under specifed edac_mc_device */
426 static int edac_create_csrow_object(struct mem_ctl_info *mci,
427 struct csrow_info *csrow, int index)
431 csrow->dev.type = &csrow_attr_type;
432 csrow->dev.bus = mci->bus;
433 csrow->dev.groups = csrow_dev_groups;
434 device_initialize(&csrow->dev);
435 csrow->dev.parent = &mci->dev;
437 dev_set_name(&csrow->dev, "csrow%d", index);
438 dev_set_drvdata(&csrow->dev, csrow);
440 edac_dbg(0, "creating (virtual) csrow node %s\n",
441 dev_name(&csrow->dev));
443 err = device_add(&csrow->dev);
445 put_device(&csrow->dev);
450 /* Create a CSROW object under specifed edac_mc_device */
451 static int edac_create_csrow_objects(struct mem_ctl_info *mci)
454 struct csrow_info *csrow;
456 for (i = 0; i < mci->nr_csrows; i++) {
457 csrow = mci->csrows[i];
458 if (!nr_pages_per_csrow(csrow))
460 err = edac_create_csrow_object(mci, mci->csrows[i], i);
463 "failure: create csrow objects for csrow %d\n",
471 for (--i; i >= 0; i--) {
472 csrow = mci->csrows[i];
473 if (!nr_pages_per_csrow(csrow))
475 put_device(&mci->csrows[i]->dev);
481 static void edac_delete_csrow_objects(struct mem_ctl_info *mci)
484 struct csrow_info *csrow;
486 for (i = mci->nr_csrows - 1; i >= 0; i--) {
487 csrow = mci->csrows[i];
488 if (!nr_pages_per_csrow(csrow))
490 device_unregister(&mci->csrows[i]->dev);
496 * Per-dimm (or per-rank) devices
499 #define to_dimm(k) container_of(k, struct dimm_info, dev)
501 /* show/store functions for DIMM Label attributes */
502 static ssize_t dimmdev_location_show(struct device *dev,
503 struct device_attribute *mattr, char *data)
505 struct dimm_info *dimm = to_dimm(dev);
507 return edac_dimm_info_location(dimm, data, PAGE_SIZE);
510 static ssize_t dimmdev_label_show(struct device *dev,
511 struct device_attribute *mattr, char *data)
513 struct dimm_info *dimm = to_dimm(dev);
515 /* if field has not been initialized, there is nothing to send */
519 return snprintf(data, sizeof(dimm->label) + 1, "%s\n", dimm->label);
522 static ssize_t dimmdev_label_store(struct device *dev,
523 struct device_attribute *mattr,
527 struct dimm_info *dimm = to_dimm(dev);
528 size_t copy_count = count;
533 if (data[count - 1] == '\0' || data[count - 1] == '\n')
536 if (copy_count == 0 || copy_count >= sizeof(dimm->label))
539 strncpy(dimm->label, data, copy_count);
540 dimm->label[copy_count] = '\0';
545 static ssize_t dimmdev_size_show(struct device *dev,
546 struct device_attribute *mattr, char *data)
548 struct dimm_info *dimm = to_dimm(dev);
550 return sprintf(data, "%u\n", PAGES_TO_MiB(dimm->nr_pages));
553 static ssize_t dimmdev_mem_type_show(struct device *dev,
554 struct device_attribute *mattr, char *data)
556 struct dimm_info *dimm = to_dimm(dev);
558 return sprintf(data, "%s\n", mem_types[dimm->mtype]);
561 static ssize_t dimmdev_dev_type_show(struct device *dev,
562 struct device_attribute *mattr, char *data)
564 struct dimm_info *dimm = to_dimm(dev);
566 return sprintf(data, "%s\n", dev_types[dimm->dtype]);
569 static ssize_t dimmdev_edac_mode_show(struct device *dev,
570 struct device_attribute *mattr,
573 struct dimm_info *dimm = to_dimm(dev);
575 return sprintf(data, "%s\n", edac_caps[dimm->edac_mode]);
578 static ssize_t dimmdev_ce_count_show(struct device *dev,
579 struct device_attribute *mattr,
582 struct dimm_info *dimm = to_dimm(dev);
586 off = EDAC_DIMM_OFF(dimm->mci->layers,
591 count = dimm->mci->ce_per_layer[dimm->mci->n_layers-1][off];
592 return sprintf(data, "%u\n", count);
595 static ssize_t dimmdev_ue_count_show(struct device *dev,
596 struct device_attribute *mattr,
599 struct dimm_info *dimm = to_dimm(dev);
603 off = EDAC_DIMM_OFF(dimm->mci->layers,
608 count = dimm->mci->ue_per_layer[dimm->mci->n_layers-1][off];
609 return sprintf(data, "%u\n", count);
612 /* dimm/rank attribute files */
613 static DEVICE_ATTR(dimm_label, S_IRUGO | S_IWUSR,
614 dimmdev_label_show, dimmdev_label_store);
615 static DEVICE_ATTR(dimm_location, S_IRUGO, dimmdev_location_show, NULL);
616 static DEVICE_ATTR(size, S_IRUGO, dimmdev_size_show, NULL);
617 static DEVICE_ATTR(dimm_mem_type, S_IRUGO, dimmdev_mem_type_show, NULL);
618 static DEVICE_ATTR(dimm_dev_type, S_IRUGO, dimmdev_dev_type_show, NULL);
619 static DEVICE_ATTR(dimm_edac_mode, S_IRUGO, dimmdev_edac_mode_show, NULL);
620 static DEVICE_ATTR(dimm_ce_count, S_IRUGO, dimmdev_ce_count_show, NULL);
621 static DEVICE_ATTR(dimm_ue_count, S_IRUGO, dimmdev_ue_count_show, NULL);
623 /* attributes of the dimm<id>/rank<id> object */
624 static struct attribute *dimm_attrs[] = {
625 &dev_attr_dimm_label.attr,
626 &dev_attr_dimm_location.attr,
628 &dev_attr_dimm_mem_type.attr,
629 &dev_attr_dimm_dev_type.attr,
630 &dev_attr_dimm_edac_mode.attr,
631 &dev_attr_dimm_ce_count.attr,
632 &dev_attr_dimm_ue_count.attr,
636 static const struct attribute_group dimm_attr_grp = {
640 static const struct attribute_group *dimm_attr_groups[] = {
645 static void dimm_attr_release(struct device *dev)
647 struct dimm_info *dimm = container_of(dev, struct dimm_info, dev);
649 edac_dbg(1, "Releasing dimm device %s\n", dev_name(dev));
653 static const struct device_type dimm_attr_type = {
654 .groups = dimm_attr_groups,
655 .release = dimm_attr_release,
658 /* Create a DIMM object under specifed memory controller device */
659 static int edac_create_dimm_object(struct mem_ctl_info *mci,
660 struct dimm_info *dimm,
666 dimm->dev.type = &dimm_attr_type;
667 dimm->dev.bus = mci->bus;
668 device_initialize(&dimm->dev);
670 dimm->dev.parent = &mci->dev;
672 dev_set_name(&dimm->dev, "rank%d", index);
674 dev_set_name(&dimm->dev, "dimm%d", index);
675 dev_set_drvdata(&dimm->dev, dimm);
676 pm_runtime_forbid(&mci->dev);
678 err = device_add(&dimm->dev);
680 edac_dbg(0, "creating rank/dimm device %s\n", dev_name(&dimm->dev));
686 * Memory controller device
689 #define to_mci(k) container_of(k, struct mem_ctl_info, dev)
691 static ssize_t mci_reset_counters_store(struct device *dev,
692 struct device_attribute *mattr,
693 const char *data, size_t count)
695 struct mem_ctl_info *mci = to_mci(dev);
696 int cnt, row, chan, i;
699 mci->ue_noinfo_count = 0;
700 mci->ce_noinfo_count = 0;
702 for (row = 0; row < mci->nr_csrows; row++) {
703 struct csrow_info *ri = mci->csrows[row];
708 for (chan = 0; chan < ri->nr_channels; chan++)
709 ri->channels[chan]->ce_count = 0;
713 for (i = 0; i < mci->n_layers; i++) {
714 cnt *= mci->layers[i].size;
715 memset(mci->ce_per_layer[i], 0, cnt * sizeof(u32));
716 memset(mci->ue_per_layer[i], 0, cnt * sizeof(u32));
719 mci->start_time = jiffies;
723 /* Memory scrubbing interface:
725 * A MC driver can limit the scrubbing bandwidth based on the CPU type.
726 * Therefore, ->set_sdram_scrub_rate should be made to return the actual
727 * bandwidth that is accepted or 0 when scrubbing is to be disabled.
729 * Negative value still means that an error has occurred while setting
732 static ssize_t mci_sdram_scrub_rate_store(struct device *dev,
733 struct device_attribute *mattr,
734 const char *data, size_t count)
736 struct mem_ctl_info *mci = to_mci(dev);
737 unsigned long bandwidth = 0;
740 if (kstrtoul(data, 10, &bandwidth) < 0)
743 new_bw = mci->set_sdram_scrub_rate(mci, bandwidth);
745 edac_printk(KERN_WARNING, EDAC_MC,
746 "Error setting scrub rate to: %lu\n", bandwidth);
754 * ->get_sdram_scrub_rate() return value semantics same as above.
756 static ssize_t mci_sdram_scrub_rate_show(struct device *dev,
757 struct device_attribute *mattr,
760 struct mem_ctl_info *mci = to_mci(dev);
763 bandwidth = mci->get_sdram_scrub_rate(mci);
765 edac_printk(KERN_DEBUG, EDAC_MC, "Error reading scrub rate\n");
769 return sprintf(data, "%d\n", bandwidth);
772 /* default attribute files for the MCI object */
773 static ssize_t mci_ue_count_show(struct device *dev,
774 struct device_attribute *mattr,
777 struct mem_ctl_info *mci = to_mci(dev);
779 return sprintf(data, "%d\n", mci->ue_mc);
782 static ssize_t mci_ce_count_show(struct device *dev,
783 struct device_attribute *mattr,
786 struct mem_ctl_info *mci = to_mci(dev);
788 return sprintf(data, "%d\n", mci->ce_mc);
791 static ssize_t mci_ce_noinfo_show(struct device *dev,
792 struct device_attribute *mattr,
795 struct mem_ctl_info *mci = to_mci(dev);
797 return sprintf(data, "%d\n", mci->ce_noinfo_count);
800 static ssize_t mci_ue_noinfo_show(struct device *dev,
801 struct device_attribute *mattr,
804 struct mem_ctl_info *mci = to_mci(dev);
806 return sprintf(data, "%d\n", mci->ue_noinfo_count);
809 static ssize_t mci_seconds_show(struct device *dev,
810 struct device_attribute *mattr,
813 struct mem_ctl_info *mci = to_mci(dev);
815 return sprintf(data, "%ld\n", (jiffies - mci->start_time) / HZ);
818 static ssize_t mci_ctl_name_show(struct device *dev,
819 struct device_attribute *mattr,
822 struct mem_ctl_info *mci = to_mci(dev);
824 return sprintf(data, "%s\n", mci->ctl_name);
827 static ssize_t mci_size_mb_show(struct device *dev,
828 struct device_attribute *mattr,
831 struct mem_ctl_info *mci = to_mci(dev);
832 int total_pages = 0, csrow_idx, j;
834 for (csrow_idx = 0; csrow_idx < mci->nr_csrows; csrow_idx++) {
835 struct csrow_info *csrow = mci->csrows[csrow_idx];
837 for (j = 0; j < csrow->nr_channels; j++) {
838 struct dimm_info *dimm = csrow->channels[j]->dimm;
840 total_pages += dimm->nr_pages;
844 return sprintf(data, "%u\n", PAGES_TO_MiB(total_pages));
847 static ssize_t mci_max_location_show(struct device *dev,
848 struct device_attribute *mattr,
851 struct mem_ctl_info *mci = to_mci(dev);
855 for (i = 0; i < mci->n_layers; i++) {
856 p += sprintf(p, "%s %d ",
857 edac_layer_name[mci->layers[i].type],
858 mci->layers[i].size - 1);
864 /* default Control file */
865 static DEVICE_ATTR(reset_counters, S_IWUSR, NULL, mci_reset_counters_store);
867 /* default Attribute files */
868 static DEVICE_ATTR(mc_name, S_IRUGO, mci_ctl_name_show, NULL);
869 static DEVICE_ATTR(size_mb, S_IRUGO, mci_size_mb_show, NULL);
870 static DEVICE_ATTR(seconds_since_reset, S_IRUGO, mci_seconds_show, NULL);
871 static DEVICE_ATTR(ue_noinfo_count, S_IRUGO, mci_ue_noinfo_show, NULL);
872 static DEVICE_ATTR(ce_noinfo_count, S_IRUGO, mci_ce_noinfo_show, NULL);
873 static DEVICE_ATTR(ue_count, S_IRUGO, mci_ue_count_show, NULL);
874 static DEVICE_ATTR(ce_count, S_IRUGO, mci_ce_count_show, NULL);
875 static DEVICE_ATTR(max_location, S_IRUGO, mci_max_location_show, NULL);
877 /* memory scrubber attribute file */
878 static DEVICE_ATTR(sdram_scrub_rate, 0, mci_sdram_scrub_rate_show,
879 mci_sdram_scrub_rate_store); /* umode set later in is_visible */
881 static struct attribute *mci_attrs[] = {
882 &dev_attr_reset_counters.attr,
883 &dev_attr_mc_name.attr,
884 &dev_attr_size_mb.attr,
885 &dev_attr_seconds_since_reset.attr,
886 &dev_attr_ue_noinfo_count.attr,
887 &dev_attr_ce_noinfo_count.attr,
888 &dev_attr_ue_count.attr,
889 &dev_attr_ce_count.attr,
890 &dev_attr_max_location.attr,
891 &dev_attr_sdram_scrub_rate.attr,
895 static umode_t mci_attr_is_visible(struct kobject *kobj,
896 struct attribute *attr, int idx)
898 struct device *dev = kobj_to_dev(kobj);
899 struct mem_ctl_info *mci = to_mci(dev);
902 if (attr != &dev_attr_sdram_scrub_rate.attr)
904 if (mci->get_sdram_scrub_rate)
906 if (mci->set_sdram_scrub_rate)
911 static const struct attribute_group mci_attr_grp = {
913 .is_visible = mci_attr_is_visible,
916 static const struct attribute_group *mci_attr_groups[] = {
921 static void mci_attr_release(struct device *dev)
923 struct mem_ctl_info *mci = container_of(dev, struct mem_ctl_info, dev);
925 edac_dbg(1, "Releasing csrow device %s\n", dev_name(dev));
929 static const struct device_type mci_attr_type = {
930 .groups = mci_attr_groups,
931 .release = mci_attr_release,
935 * Create a new Memory Controller kobject instance,
936 * mc<id> under the 'mc' directory
942 int edac_create_sysfs_mci_device(struct mem_ctl_info *mci,
943 const struct attribute_group **groups)
949 * The memory controller needs its own bus, in order to avoid
950 * namespace conflicts at /sys/bus/edac.
952 name = kasprintf(GFP_KERNEL, "mc%d", mci->mc_idx);
956 mci->bus->name = name;
958 edac_dbg(0, "creating bus %s\n", mci->bus->name);
960 err = bus_register(mci->bus);
966 /* get the /sys/devices/system/edac subsys reference */
967 mci->dev.type = &mci_attr_type;
968 device_initialize(&mci->dev);
970 mci->dev.parent = mci_pdev;
971 mci->dev.bus = mci->bus;
972 mci->dev.groups = groups;
973 dev_set_name(&mci->dev, "mc%d", mci->mc_idx);
974 dev_set_drvdata(&mci->dev, mci);
975 pm_runtime_forbid(&mci->dev);
977 edac_dbg(0, "creating device %s\n", dev_name(&mci->dev));
978 err = device_add(&mci->dev);
980 edac_dbg(1, "failure: create device %s\n", dev_name(&mci->dev));
981 goto fail_unregister_bus;
985 * Create the dimm/rank devices
987 for (i = 0; i < mci->tot_dimms; i++) {
988 struct dimm_info *dimm = mci->dimms[i];
989 /* Only expose populated DIMMs */
993 #ifdef CONFIG_EDAC_DEBUG
994 edac_dbg(1, "creating dimm%d, located at ", i);
995 if (edac_debug_level >= 1) {
997 for (lay = 0; lay < mci->n_layers; lay++)
998 printk(KERN_CONT "%s %d ",
999 edac_layer_name[mci->layers[lay].type],
1000 dimm->location[lay]);
1001 printk(KERN_CONT "\n");
1004 err = edac_create_dimm_object(mci, dimm, i);
1006 edac_dbg(1, "failure: create dimm %d obj\n", i);
1007 goto fail_unregister_dimm;
1011 #ifdef CONFIG_EDAC_LEGACY_SYSFS
1012 err = edac_create_csrow_objects(mci);
1014 goto fail_unregister_dimm;
1017 edac_create_debugfs_nodes(mci);
1020 fail_unregister_dimm:
1021 for (i--; i >= 0; i--) {
1022 struct dimm_info *dimm = mci->dimms[i];
1023 if (!dimm->nr_pages)
1026 device_unregister(&dimm->dev);
1028 device_unregister(&mci->dev);
1029 fail_unregister_bus:
1030 bus_unregister(mci->bus);
1037 * remove a Memory Controller instance
1039 void edac_remove_sysfs_mci_device(struct mem_ctl_info *mci)
1045 #ifdef CONFIG_EDAC_DEBUG
1046 edac_debugfs_remove_recursive(mci->debugfs);
1048 #ifdef CONFIG_EDAC_LEGACY_SYSFS
1049 edac_delete_csrow_objects(mci);
1052 for (i = 0; i < mci->tot_dimms; i++) {
1053 struct dimm_info *dimm = mci->dimms[i];
1054 if (dimm->nr_pages == 0)
1056 edac_dbg(0, "removing device %s\n", dev_name(&dimm->dev));
1057 device_unregister(&dimm->dev);
1061 void edac_unregister_sysfs(struct mem_ctl_info *mci)
1063 struct bus_type *bus = mci->bus;
1064 const char *name = mci->bus->name;
1066 edac_dbg(1, "Unregistering device %s\n", dev_name(&mci->dev));
1067 device_unregister(&mci->dev);
1068 bus_unregister(bus);
1072 static void mc_attr_release(struct device *dev)
1075 * There's no container structure here, as this is just the mci
1076 * parent device, used to create the /sys/devices/mc sysfs node.
1077 * So, there are no attributes on it.
1079 edac_dbg(1, "Releasing device %s\n", dev_name(dev));
1083 static const struct device_type mc_attr_type = {
1084 .release = mc_attr_release,
1087 * Init/exit code for the module. Basically, creates/removes /sys/class/rc
1089 int __init edac_mc_sysfs_init(void)
1093 mci_pdev = kzalloc(sizeof(*mci_pdev), GFP_KERNEL);
1099 mci_pdev->bus = edac_get_sysfs_subsys();
1100 mci_pdev->type = &mc_attr_type;
1101 device_initialize(mci_pdev);
1102 dev_set_name(mci_pdev, "mc");
1104 err = device_add(mci_pdev);
1106 goto out_put_device;
1108 edac_dbg(0, "device %s created\n", dev_name(mci_pdev));
1113 put_device(mci_pdev);
1118 void edac_mc_sysfs_exit(void)
1120 device_unregister(mci_pdev);