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>
22 #include "edac_core.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 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 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 = kstrtoul(val, 0, &l);
68 *((unsigned long *)kp->arg) = l;
70 /* notify edac_mc engine to reset the poll period */
71 edac_mc_reset_delay_period(l);
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_int,
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, EDAC_MC_LABEL_LEN, "%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];
244 ssize_t max_size = 0;
246 max_size = min((ssize_t) count, (ssize_t) EDAC_MC_LABEL_LEN - 1);
247 strncpy(rank->dimm->label, data, max_size);
248 rank->dimm->label[max_size] = '\0';
253 /* show function for dynamic chX_ce_count attribute */
254 static ssize_t channel_ce_count_show(struct device *dev,
255 struct device_attribute *mattr, char *data)
257 struct csrow_info *csrow = to_csrow(dev);
258 unsigned chan = to_channel(mattr);
259 struct rank_info *rank = csrow->channels[chan];
261 return sprintf(data, "%u\n", rank->ce_count);
264 /* cwrow<id>/attribute files */
265 DEVICE_ATTR_LEGACY(size_mb, S_IRUGO, csrow_size_show, NULL);
266 DEVICE_ATTR_LEGACY(dev_type, S_IRUGO, csrow_dev_type_show, NULL);
267 DEVICE_ATTR_LEGACY(mem_type, S_IRUGO, csrow_mem_type_show, NULL);
268 DEVICE_ATTR_LEGACY(edac_mode, S_IRUGO, csrow_edac_mode_show, NULL);
269 DEVICE_ATTR_LEGACY(ue_count, S_IRUGO, csrow_ue_count_show, NULL);
270 DEVICE_ATTR_LEGACY(ce_count, S_IRUGO, csrow_ce_count_show, NULL);
272 /* default attributes of the CSROW<id> object */
273 static struct attribute *csrow_attrs[] = {
274 &dev_attr_legacy_dev_type.attr,
275 &dev_attr_legacy_mem_type.attr,
276 &dev_attr_legacy_edac_mode.attr,
277 &dev_attr_legacy_size_mb.attr,
278 &dev_attr_legacy_ue_count.attr,
279 &dev_attr_legacy_ce_count.attr,
283 static struct attribute_group csrow_attr_grp = {
284 .attrs = csrow_attrs,
287 static const struct attribute_group *csrow_attr_groups[] = {
292 static void csrow_attr_release(struct device *dev)
294 struct csrow_info *csrow = container_of(dev, struct csrow_info, dev);
296 edac_dbg(1, "Releasing csrow device %s\n", dev_name(dev));
300 static struct device_type csrow_attr_type = {
301 .groups = csrow_attr_groups,
302 .release = csrow_attr_release,
306 * possible dynamic channel DIMM Label attribute files
310 #define EDAC_NR_CHANNELS 6
312 DEVICE_CHANNEL(ch0_dimm_label, S_IRUGO | S_IWUSR,
313 channel_dimm_label_show, channel_dimm_label_store, 0);
314 DEVICE_CHANNEL(ch1_dimm_label, S_IRUGO | S_IWUSR,
315 channel_dimm_label_show, channel_dimm_label_store, 1);
316 DEVICE_CHANNEL(ch2_dimm_label, S_IRUGO | S_IWUSR,
317 channel_dimm_label_show, channel_dimm_label_store, 2);
318 DEVICE_CHANNEL(ch3_dimm_label, S_IRUGO | S_IWUSR,
319 channel_dimm_label_show, channel_dimm_label_store, 3);
320 DEVICE_CHANNEL(ch4_dimm_label, S_IRUGO | S_IWUSR,
321 channel_dimm_label_show, channel_dimm_label_store, 4);
322 DEVICE_CHANNEL(ch5_dimm_label, S_IRUGO | S_IWUSR,
323 channel_dimm_label_show, channel_dimm_label_store, 5);
325 /* Total possible dynamic DIMM Label attribute file table */
326 static struct attribute *dynamic_csrow_dimm_attr[] = {
327 &dev_attr_legacy_ch0_dimm_label.attr.attr,
328 &dev_attr_legacy_ch1_dimm_label.attr.attr,
329 &dev_attr_legacy_ch2_dimm_label.attr.attr,
330 &dev_attr_legacy_ch3_dimm_label.attr.attr,
331 &dev_attr_legacy_ch4_dimm_label.attr.attr,
332 &dev_attr_legacy_ch5_dimm_label.attr.attr,
336 /* possible dynamic channel ce_count attribute files */
337 DEVICE_CHANNEL(ch0_ce_count, S_IRUGO,
338 channel_ce_count_show, NULL, 0);
339 DEVICE_CHANNEL(ch1_ce_count, S_IRUGO,
340 channel_ce_count_show, NULL, 1);
341 DEVICE_CHANNEL(ch2_ce_count, S_IRUGO,
342 channel_ce_count_show, NULL, 2);
343 DEVICE_CHANNEL(ch3_ce_count, S_IRUGO,
344 channel_ce_count_show, NULL, 3);
345 DEVICE_CHANNEL(ch4_ce_count, S_IRUGO,
346 channel_ce_count_show, NULL, 4);
347 DEVICE_CHANNEL(ch5_ce_count, S_IRUGO,
348 channel_ce_count_show, NULL, 5);
350 /* Total possible dynamic ce_count attribute file table */
351 static struct attribute *dynamic_csrow_ce_count_attr[] = {
352 &dev_attr_legacy_ch0_ce_count.attr.attr,
353 &dev_attr_legacy_ch1_ce_count.attr.attr,
354 &dev_attr_legacy_ch2_ce_count.attr.attr,
355 &dev_attr_legacy_ch3_ce_count.attr.attr,
356 &dev_attr_legacy_ch4_ce_count.attr.attr,
357 &dev_attr_legacy_ch5_ce_count.attr.attr,
361 static umode_t csrow_dev_is_visible(struct kobject *kobj,
362 struct attribute *attr, int idx)
364 struct device *dev = kobj_to_dev(kobj);
365 struct csrow_info *csrow = container_of(dev, struct csrow_info, dev);
367 if (idx >= csrow->nr_channels)
369 /* Only expose populated DIMMs */
370 if (!csrow->channels[idx]->dimm->nr_pages)
376 static const struct attribute_group csrow_dev_dimm_group = {
377 .attrs = dynamic_csrow_dimm_attr,
378 .is_visible = csrow_dev_is_visible,
381 static const struct attribute_group csrow_dev_ce_count_group = {
382 .attrs = dynamic_csrow_ce_count_attr,
383 .is_visible = csrow_dev_is_visible,
386 static const struct attribute_group *csrow_dev_groups[] = {
387 &csrow_dev_dimm_group,
388 &csrow_dev_ce_count_group,
392 static inline int nr_pages_per_csrow(struct csrow_info *csrow)
394 int chan, nr_pages = 0;
396 for (chan = 0; chan < csrow->nr_channels; chan++)
397 nr_pages += csrow->channels[chan]->dimm->nr_pages;
402 /* Create a CSROW object under specifed edac_mc_device */
403 static int edac_create_csrow_object(struct mem_ctl_info *mci,
404 struct csrow_info *csrow, int index)
406 if (csrow->nr_channels > EDAC_NR_CHANNELS)
409 csrow->dev.type = &csrow_attr_type;
410 csrow->dev.bus = mci->bus;
411 csrow->dev.groups = csrow_dev_groups;
412 device_initialize(&csrow->dev);
413 csrow->dev.parent = &mci->dev;
415 dev_set_name(&csrow->dev, "csrow%d", index);
416 dev_set_drvdata(&csrow->dev, csrow);
418 edac_dbg(0, "creating (virtual) csrow node %s\n",
419 dev_name(&csrow->dev));
421 return device_add(&csrow->dev);
424 /* Create a CSROW object under specifed edac_mc_device */
425 static int edac_create_csrow_objects(struct mem_ctl_info *mci)
428 struct csrow_info *csrow;
430 for (i = 0; i < mci->nr_csrows; i++) {
431 csrow = mci->csrows[i];
432 if (!nr_pages_per_csrow(csrow))
434 err = edac_create_csrow_object(mci, mci->csrows[i], i);
437 "failure: create csrow objects for csrow %d\n",
445 for (--i; i >= 0; i--) {
446 csrow = mci->csrows[i];
447 if (!nr_pages_per_csrow(csrow))
449 put_device(&mci->csrows[i]->dev);
455 static void edac_delete_csrow_objects(struct mem_ctl_info *mci)
458 struct csrow_info *csrow;
460 for (i = mci->nr_csrows - 1; i >= 0; i--) {
461 csrow = mci->csrows[i];
462 if (!nr_pages_per_csrow(csrow))
464 device_unregister(&mci->csrows[i]->dev);
470 * Per-dimm (or per-rank) devices
473 #define to_dimm(k) container_of(k, struct dimm_info, dev)
475 /* show/store functions for DIMM Label attributes */
476 static ssize_t dimmdev_location_show(struct device *dev,
477 struct device_attribute *mattr, char *data)
479 struct dimm_info *dimm = to_dimm(dev);
481 return edac_dimm_info_location(dimm, data, PAGE_SIZE);
484 static ssize_t dimmdev_label_show(struct device *dev,
485 struct device_attribute *mattr, char *data)
487 struct dimm_info *dimm = to_dimm(dev);
489 /* if field has not been initialized, there is nothing to send */
493 return snprintf(data, EDAC_MC_LABEL_LEN, "%s\n", dimm->label);
496 static ssize_t dimmdev_label_store(struct device *dev,
497 struct device_attribute *mattr,
501 struct dimm_info *dimm = to_dimm(dev);
503 ssize_t max_size = 0;
505 max_size = min((ssize_t) count, (ssize_t) EDAC_MC_LABEL_LEN - 1);
506 strncpy(dimm->label, data, max_size);
507 dimm->label[max_size] = '\0';
512 static ssize_t dimmdev_size_show(struct device *dev,
513 struct device_attribute *mattr, char *data)
515 struct dimm_info *dimm = to_dimm(dev);
517 return sprintf(data, "%u\n", PAGES_TO_MiB(dimm->nr_pages));
520 static ssize_t dimmdev_mem_type_show(struct device *dev,
521 struct device_attribute *mattr, char *data)
523 struct dimm_info *dimm = to_dimm(dev);
525 return sprintf(data, "%s\n", mem_types[dimm->mtype]);
528 static ssize_t dimmdev_dev_type_show(struct device *dev,
529 struct device_attribute *mattr, char *data)
531 struct dimm_info *dimm = to_dimm(dev);
533 return sprintf(data, "%s\n", dev_types[dimm->dtype]);
536 static ssize_t dimmdev_edac_mode_show(struct device *dev,
537 struct device_attribute *mattr,
540 struct dimm_info *dimm = to_dimm(dev);
542 return sprintf(data, "%s\n", edac_caps[dimm->edac_mode]);
545 /* dimm/rank attribute files */
546 static DEVICE_ATTR(dimm_label, S_IRUGO | S_IWUSR,
547 dimmdev_label_show, dimmdev_label_store);
548 static DEVICE_ATTR(dimm_location, S_IRUGO, dimmdev_location_show, NULL);
549 static DEVICE_ATTR(size, S_IRUGO, dimmdev_size_show, NULL);
550 static DEVICE_ATTR(dimm_mem_type, S_IRUGO, dimmdev_mem_type_show, NULL);
551 static DEVICE_ATTR(dimm_dev_type, S_IRUGO, dimmdev_dev_type_show, NULL);
552 static DEVICE_ATTR(dimm_edac_mode, S_IRUGO, dimmdev_edac_mode_show, NULL);
554 /* attributes of the dimm<id>/rank<id> object */
555 static struct attribute *dimm_attrs[] = {
556 &dev_attr_dimm_label.attr,
557 &dev_attr_dimm_location.attr,
559 &dev_attr_dimm_mem_type.attr,
560 &dev_attr_dimm_dev_type.attr,
561 &dev_attr_dimm_edac_mode.attr,
565 static struct attribute_group dimm_attr_grp = {
569 static const struct attribute_group *dimm_attr_groups[] = {
574 static void dimm_attr_release(struct device *dev)
576 struct dimm_info *dimm = container_of(dev, struct dimm_info, dev);
578 edac_dbg(1, "Releasing dimm device %s\n", dev_name(dev));
582 static struct device_type dimm_attr_type = {
583 .groups = dimm_attr_groups,
584 .release = dimm_attr_release,
587 /* Create a DIMM object under specifed memory controller device */
588 static int edac_create_dimm_object(struct mem_ctl_info *mci,
589 struct dimm_info *dimm,
595 dimm->dev.type = &dimm_attr_type;
596 dimm->dev.bus = mci->bus;
597 device_initialize(&dimm->dev);
599 dimm->dev.parent = &mci->dev;
601 dev_set_name(&dimm->dev, "rank%d", index);
603 dev_set_name(&dimm->dev, "dimm%d", index);
604 dev_set_drvdata(&dimm->dev, dimm);
605 pm_runtime_forbid(&mci->dev);
607 err = device_add(&dimm->dev);
609 edac_dbg(0, "creating rank/dimm device %s\n", dev_name(&dimm->dev));
615 * Memory controller device
618 #define to_mci(k) container_of(k, struct mem_ctl_info, dev)
620 static ssize_t mci_reset_counters_store(struct device *dev,
621 struct device_attribute *mattr,
622 const char *data, size_t count)
624 struct mem_ctl_info *mci = to_mci(dev);
625 int cnt, row, chan, i;
628 mci->ue_noinfo_count = 0;
629 mci->ce_noinfo_count = 0;
631 for (row = 0; row < mci->nr_csrows; row++) {
632 struct csrow_info *ri = mci->csrows[row];
637 for (chan = 0; chan < ri->nr_channels; chan++)
638 ri->channels[chan]->ce_count = 0;
642 for (i = 0; i < mci->n_layers; i++) {
643 cnt *= mci->layers[i].size;
644 memset(mci->ce_per_layer[i], 0, cnt * sizeof(u32));
645 memset(mci->ue_per_layer[i], 0, cnt * sizeof(u32));
648 mci->start_time = jiffies;
652 /* Memory scrubbing interface:
654 * A MC driver can limit the scrubbing bandwidth based on the CPU type.
655 * Therefore, ->set_sdram_scrub_rate should be made to return the actual
656 * bandwidth that is accepted or 0 when scrubbing is to be disabled.
658 * Negative value still means that an error has occurred while setting
661 static ssize_t mci_sdram_scrub_rate_store(struct device *dev,
662 struct device_attribute *mattr,
663 const char *data, size_t count)
665 struct mem_ctl_info *mci = to_mci(dev);
666 unsigned long bandwidth = 0;
669 if (kstrtoul(data, 10, &bandwidth) < 0)
672 new_bw = mci->set_sdram_scrub_rate(mci, bandwidth);
674 edac_printk(KERN_WARNING, EDAC_MC,
675 "Error setting scrub rate to: %lu\n", bandwidth);
683 * ->get_sdram_scrub_rate() return value semantics same as above.
685 static ssize_t mci_sdram_scrub_rate_show(struct device *dev,
686 struct device_attribute *mattr,
689 struct mem_ctl_info *mci = to_mci(dev);
692 bandwidth = mci->get_sdram_scrub_rate(mci);
694 edac_printk(KERN_DEBUG, EDAC_MC, "Error reading scrub rate\n");
698 return sprintf(data, "%d\n", bandwidth);
701 /* default attribute files for the MCI object */
702 static ssize_t mci_ue_count_show(struct device *dev,
703 struct device_attribute *mattr,
706 struct mem_ctl_info *mci = to_mci(dev);
708 return sprintf(data, "%d\n", mci->ue_mc);
711 static ssize_t mci_ce_count_show(struct device *dev,
712 struct device_attribute *mattr,
715 struct mem_ctl_info *mci = to_mci(dev);
717 return sprintf(data, "%d\n", mci->ce_mc);
720 static ssize_t mci_ce_noinfo_show(struct device *dev,
721 struct device_attribute *mattr,
724 struct mem_ctl_info *mci = to_mci(dev);
726 return sprintf(data, "%d\n", mci->ce_noinfo_count);
729 static ssize_t mci_ue_noinfo_show(struct device *dev,
730 struct device_attribute *mattr,
733 struct mem_ctl_info *mci = to_mci(dev);
735 return sprintf(data, "%d\n", mci->ue_noinfo_count);
738 static ssize_t mci_seconds_show(struct device *dev,
739 struct device_attribute *mattr,
742 struct mem_ctl_info *mci = to_mci(dev);
744 return sprintf(data, "%ld\n", (jiffies - mci->start_time) / HZ);
747 static ssize_t mci_ctl_name_show(struct device *dev,
748 struct device_attribute *mattr,
751 struct mem_ctl_info *mci = to_mci(dev);
753 return sprintf(data, "%s\n", mci->ctl_name);
756 static ssize_t mci_size_mb_show(struct device *dev,
757 struct device_attribute *mattr,
760 struct mem_ctl_info *mci = to_mci(dev);
761 int total_pages = 0, csrow_idx, j;
763 for (csrow_idx = 0; csrow_idx < mci->nr_csrows; csrow_idx++) {
764 struct csrow_info *csrow = mci->csrows[csrow_idx];
766 for (j = 0; j < csrow->nr_channels; j++) {
767 struct dimm_info *dimm = csrow->channels[j]->dimm;
769 total_pages += dimm->nr_pages;
773 return sprintf(data, "%u\n", PAGES_TO_MiB(total_pages));
776 static ssize_t mci_max_location_show(struct device *dev,
777 struct device_attribute *mattr,
780 struct mem_ctl_info *mci = to_mci(dev);
784 for (i = 0; i < mci->n_layers; i++) {
785 p += sprintf(p, "%s %d ",
786 edac_layer_name[mci->layers[i].type],
787 mci->layers[i].size - 1);
793 #ifdef CONFIG_EDAC_DEBUG
794 static ssize_t edac_fake_inject_write(struct file *file,
795 const char __user *data,
796 size_t count, loff_t *ppos)
798 struct device *dev = file->private_data;
799 struct mem_ctl_info *mci = to_mci(dev);
800 static enum hw_event_mc_err_type type;
801 u16 errcount = mci->fake_inject_count;
806 type = mci->fake_inject_ue ? HW_EVENT_ERR_UNCORRECTED
807 : HW_EVENT_ERR_CORRECTED;
810 "Generating %d %s fake error%s to %d.%d.%d to test core handling. NOTE: this won't test the driver-specific decoding logic.\n",
812 (type == HW_EVENT_ERR_UNCORRECTED) ? "UE" : "CE",
813 errcount > 1 ? "s" : "",
814 mci->fake_inject_layer[0],
815 mci->fake_inject_layer[1],
816 mci->fake_inject_layer[2]
818 edac_mc_handle_error(type, mci, errcount, 0, 0, 0,
819 mci->fake_inject_layer[0],
820 mci->fake_inject_layer[1],
821 mci->fake_inject_layer[2],
822 "FAKE ERROR", "for EDAC testing only");
827 static const struct file_operations debug_fake_inject_fops = {
829 .write = edac_fake_inject_write,
830 .llseek = generic_file_llseek,
834 /* default Control file */
835 static DEVICE_ATTR(reset_counters, S_IWUSR, NULL, mci_reset_counters_store);
837 /* default Attribute files */
838 static DEVICE_ATTR(mc_name, S_IRUGO, mci_ctl_name_show, NULL);
839 static DEVICE_ATTR(size_mb, S_IRUGO, mci_size_mb_show, NULL);
840 static DEVICE_ATTR(seconds_since_reset, S_IRUGO, mci_seconds_show, NULL);
841 static DEVICE_ATTR(ue_noinfo_count, S_IRUGO, mci_ue_noinfo_show, NULL);
842 static DEVICE_ATTR(ce_noinfo_count, S_IRUGO, mci_ce_noinfo_show, NULL);
843 static DEVICE_ATTR(ue_count, S_IRUGO, mci_ue_count_show, NULL);
844 static DEVICE_ATTR(ce_count, S_IRUGO, mci_ce_count_show, NULL);
845 static DEVICE_ATTR(max_location, S_IRUGO, mci_max_location_show, NULL);
847 /* memory scrubber attribute file */
848 DEVICE_ATTR(sdram_scrub_rate, 0, mci_sdram_scrub_rate_show,
849 mci_sdram_scrub_rate_store); /* umode set later in is_visible */
851 static struct attribute *mci_attrs[] = {
852 &dev_attr_reset_counters.attr,
853 &dev_attr_mc_name.attr,
854 &dev_attr_size_mb.attr,
855 &dev_attr_seconds_since_reset.attr,
856 &dev_attr_ue_noinfo_count.attr,
857 &dev_attr_ce_noinfo_count.attr,
858 &dev_attr_ue_count.attr,
859 &dev_attr_ce_count.attr,
860 &dev_attr_max_location.attr,
861 &dev_attr_sdram_scrub_rate.attr,
865 static umode_t mci_attr_is_visible(struct kobject *kobj,
866 struct attribute *attr, int idx)
868 struct device *dev = kobj_to_dev(kobj);
869 struct mem_ctl_info *mci = to_mci(dev);
872 if (attr != &dev_attr_sdram_scrub_rate.attr)
874 if (mci->get_sdram_scrub_rate)
876 if (mci->set_sdram_scrub_rate)
881 static struct attribute_group mci_attr_grp = {
883 .is_visible = mci_attr_is_visible,
886 static const struct attribute_group *mci_attr_groups[] = {
891 static void mci_attr_release(struct device *dev)
893 struct mem_ctl_info *mci = container_of(dev, struct mem_ctl_info, dev);
895 edac_dbg(1, "Releasing csrow device %s\n", dev_name(dev));
899 static struct device_type mci_attr_type = {
900 .groups = mci_attr_groups,
901 .release = mci_attr_release,
904 #ifdef CONFIG_EDAC_DEBUG
905 static struct dentry *edac_debugfs;
907 int __init edac_debugfs_init(void)
909 edac_debugfs = debugfs_create_dir("edac", NULL);
910 if (IS_ERR(edac_debugfs)) {
917 void edac_debugfs_exit(void)
919 debugfs_remove(edac_debugfs);
922 static int edac_create_debug_nodes(struct mem_ctl_info *mci)
924 struct dentry *d, *parent;
931 d = debugfs_create_dir(mci->dev.kobj.name, edac_debugfs);
936 for (i = 0; i < mci->n_layers; i++) {
937 sprintf(name, "fake_inject_%s",
938 edac_layer_name[mci->layers[i].type]);
939 d = debugfs_create_u8(name, S_IRUGO | S_IWUSR, parent,
940 &mci->fake_inject_layer[i]);
945 d = debugfs_create_bool("fake_inject_ue", S_IRUGO | S_IWUSR, parent,
946 &mci->fake_inject_ue);
950 d = debugfs_create_u16("fake_inject_count", S_IRUGO | S_IWUSR, parent,
951 &mci->fake_inject_count);
955 d = debugfs_create_file("fake_inject", S_IWUSR, parent,
957 &debug_fake_inject_fops);
961 mci->debugfs = parent;
964 debugfs_remove(mci->debugfs);
970 * Create a new Memory Controller kobject instance,
971 * mc<id> under the 'mc' directory
977 int edac_create_sysfs_mci_device(struct mem_ctl_info *mci,
978 const struct attribute_group **groups)
983 * The memory controller needs its own bus, in order to avoid
984 * namespace conflicts at /sys/bus/edac.
986 mci->bus->name = kasprintf(GFP_KERNEL, "mc%d", mci->mc_idx);
990 edac_dbg(0, "creating bus %s\n", mci->bus->name);
992 err = bus_register(mci->bus);
996 /* get the /sys/devices/system/edac subsys reference */
997 mci->dev.type = &mci_attr_type;
998 device_initialize(&mci->dev);
1000 mci->dev.parent = mci_pdev;
1001 mci->dev.bus = mci->bus;
1002 mci->dev.groups = groups;
1003 dev_set_name(&mci->dev, "mc%d", mci->mc_idx);
1004 dev_set_drvdata(&mci->dev, mci);
1005 pm_runtime_forbid(&mci->dev);
1007 edac_dbg(0, "creating device %s\n", dev_name(&mci->dev));
1008 err = device_add(&mci->dev);
1010 edac_dbg(1, "failure: create device %s\n", dev_name(&mci->dev));
1011 goto fail_unregister_bus;
1015 * Create the dimm/rank devices
1017 for (i = 0; i < mci->tot_dimms; i++) {
1018 struct dimm_info *dimm = mci->dimms[i];
1019 /* Only expose populated DIMMs */
1020 if (!dimm->nr_pages)
1023 #ifdef CONFIG_EDAC_DEBUG
1024 edac_dbg(1, "creating dimm%d, located at ", i);
1025 if (edac_debug_level >= 1) {
1027 for (lay = 0; lay < mci->n_layers; lay++)
1028 printk(KERN_CONT "%s %d ",
1029 edac_layer_name[mci->layers[lay].type],
1030 dimm->location[lay]);
1031 printk(KERN_CONT "\n");
1034 err = edac_create_dimm_object(mci, dimm, i);
1036 edac_dbg(1, "failure: create dimm %d obj\n", i);
1037 goto fail_unregister_dimm;
1041 #ifdef CONFIG_EDAC_LEGACY_SYSFS
1042 err = edac_create_csrow_objects(mci);
1044 goto fail_unregister_dimm;
1047 #ifdef CONFIG_EDAC_DEBUG
1048 edac_create_debug_nodes(mci);
1052 fail_unregister_dimm:
1053 for (i--; i >= 0; i--) {
1054 struct dimm_info *dimm = mci->dimms[i];
1055 if (!dimm->nr_pages)
1058 device_unregister(&dimm->dev);
1060 device_unregister(&mci->dev);
1061 fail_unregister_bus:
1062 bus_unregister(mci->bus);
1064 kfree(mci->bus->name);
1069 * remove a Memory Controller instance
1071 void edac_remove_sysfs_mci_device(struct mem_ctl_info *mci)
1077 #ifdef CONFIG_EDAC_DEBUG
1078 debugfs_remove(mci->debugfs);
1080 #ifdef CONFIG_EDAC_LEGACY_SYSFS
1081 edac_delete_csrow_objects(mci);
1084 for (i = 0; i < mci->tot_dimms; i++) {
1085 struct dimm_info *dimm = mci->dimms[i];
1086 if (dimm->nr_pages == 0)
1088 edac_dbg(0, "removing device %s\n", dev_name(&dimm->dev));
1089 device_unregister(&dimm->dev);
1093 void edac_unregister_sysfs(struct mem_ctl_info *mci)
1095 edac_dbg(1, "Unregistering device %s\n", dev_name(&mci->dev));
1096 device_unregister(&mci->dev);
1097 bus_unregister(mci->bus);
1098 kfree(mci->bus->name);
1101 static void mc_attr_release(struct device *dev)
1104 * There's no container structure here, as this is just the mci
1105 * parent device, used to create the /sys/devices/mc sysfs node.
1106 * So, there are no attributes on it.
1108 edac_dbg(1, "Releasing device %s\n", dev_name(dev));
1112 static struct device_type mc_attr_type = {
1113 .release = mc_attr_release,
1116 * Init/exit code for the module. Basically, creates/removes /sys/class/rc
1118 int __init edac_mc_sysfs_init(void)
1120 struct bus_type *edac_subsys;
1123 /* get the /sys/devices/system/edac subsys reference */
1124 edac_subsys = edac_get_sysfs_subsys();
1125 if (edac_subsys == NULL) {
1126 edac_dbg(1, "no edac_subsys\n");
1131 mci_pdev = kzalloc(sizeof(*mci_pdev), GFP_KERNEL);
1137 mci_pdev->bus = edac_subsys;
1138 mci_pdev->type = &mc_attr_type;
1139 device_initialize(mci_pdev);
1140 dev_set_name(mci_pdev, "mc");
1142 err = device_add(mci_pdev);
1146 edac_dbg(0, "device %s created\n", dev_name(mci_pdev));
1153 edac_put_sysfs_subsys();
1158 void edac_mc_sysfs_exit(void)
1160 device_unregister(mci_pdev);
1161 edac_put_sysfs_subsys();