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 * (c) 2012-2013 - Mauro Carvalho Chehab
11 * The entire API were re-written, and ported to use struct device
12 *
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 */
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;
30
31 /* Getter functions for above */
edac_mc_get_log_ue(void)32 int edac_mc_get_log_ue(void)
33 {
34 return edac_mc_log_ue;
35 }
36
edac_mc_get_log_ce(void)37 int edac_mc_get_log_ce(void)
38 {
39 return edac_mc_log_ce;
40 }
41
edac_mc_get_panic_on_ue(void)42 int edac_mc_get_panic_on_ue(void)
43 {
44 return edac_mc_panic_on_ue;
45 }
46
47 /* this is temporary */
edac_mc_get_poll_msec(void)48 unsigned int edac_mc_get_poll_msec(void)
49 {
50 return edac_mc_poll_msec;
51 }
52
edac_set_poll_msec(const char * val,const struct kernel_param * kp)53 static 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 */
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");
88
89 static struct device *mci_pdev;
90
91 /*
92 * various constants for Memory Controllers
93 */
94 static 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
105 static 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_SYSFS
119 /*
120 * EDAC sysfs CSROW data structures and methods
121 */
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 API
127 * and the per-dimm/per-rank one
128 */
129 #define DEVICE_ATTR_LEGACY(_name, _mode, _show, _store) \
130 static struct device_attribute dev_attr_legacy_##_name = __ATTR(_name, _mode, _show, _store)
131
132 struct 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 */
csrow_ue_count_show(struct device * dev,struct device_attribute * mattr,char * data)144 static 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 sprintf(data, "%u\n", csrow->ue_count);
150 }
151
csrow_ce_count_show(struct device * dev,struct device_attribute * mattr,char * data)152 static 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 sprintf(data, "%u\n", csrow->ce_count);
158 }
159
csrow_size_show(struct device * dev,struct device_attribute * mattr,char * data)160 static 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 sprintf(data, "%u\n", PAGES_TO_MiB(nr_pages));
170 }
171
csrow_mem_type_show(struct device * dev,struct device_attribute * mattr,char * data)172 static 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 sprintf(data, "%s\n", edac_mem_types[csrow->channels[0]->dimm->mtype]);
178 }
179
csrow_dev_type_show(struct device * dev,struct device_attribute * mattr,char * data)180 static 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 sprintf(data, "%s\n", dev_types[csrow->channels[0]->dimm->dtype]);
186 }
187
csrow_edac_mode_show(struct device * dev,struct device_attribute * mattr,char * data)188 static 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 sprintf(data, "%s\n", edac_caps[csrow->channels[0]->dimm->edac_mode]);
195 }
196
197 /* show/store functions for DIMM Label attributes */
channel_dimm_label_show(struct device * dev,struct device_attribute * mattr,char * data)198 static 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 snprintf(data, sizeof(rank->dimm->label) + 1, "%s\n",
211 rank->dimm->label);
212 }
213
channel_dimm_label_store(struct device * dev,struct device_attribute * mattr,const char * data,size_t count)214 static ssize_t channel_dimm_label_store(struct device *dev,
215 struct device_attribute *mattr,
216 const char *data, size_t count)
217 {
218 struct csrow_info *csrow = to_csrow(dev);
219 unsigned int chan = to_channel(mattr);
220 struct rank_info *rank = csrow->channels[chan];
221 size_t copy_count = count;
222
223 if (count == 0)
224 return -EINVAL;
225
226 if (data[count - 1] == '\0' || data[count - 1] == '\n')
227 copy_count -= 1;
228
229 if (copy_count == 0 || copy_count >= sizeof(rank->dimm->label))
230 return -EINVAL;
231
232 strncpy(rank->dimm->label, data, copy_count);
233 rank->dimm->label[copy_count] = '\0';
234
235 return count;
236 }
237
238 /* show function for dynamic chX_ce_count attribute */
channel_ce_count_show(struct device * dev,struct device_attribute * mattr,char * data)239 static ssize_t channel_ce_count_show(struct device *dev,
240 struct device_attribute *mattr, char *data)
241 {
242 struct csrow_info *csrow = to_csrow(dev);
243 unsigned int chan = to_channel(mattr);
244 struct rank_info *rank = csrow->channels[chan];
245
246 return sprintf(data, "%u\n", rank->ce_count);
247 }
248
249 /* cwrow<id>/attribute files */
250 DEVICE_ATTR_LEGACY(size_mb, S_IRUGO, csrow_size_show, NULL);
251 DEVICE_ATTR_LEGACY(dev_type, S_IRUGO, csrow_dev_type_show, NULL);
252 DEVICE_ATTR_LEGACY(mem_type, S_IRUGO, csrow_mem_type_show, NULL);
253 DEVICE_ATTR_LEGACY(edac_mode, S_IRUGO, csrow_edac_mode_show, NULL);
254 DEVICE_ATTR_LEGACY(ue_count, S_IRUGO, csrow_ue_count_show, NULL);
255 DEVICE_ATTR_LEGACY(ce_count, S_IRUGO, csrow_ce_count_show, NULL);
256
257 /* default attributes of the CSROW<id> object */
258 static struct attribute *csrow_attrs[] = {
259 &dev_attr_legacy_dev_type.attr,
260 &dev_attr_legacy_mem_type.attr,
261 &dev_attr_legacy_edac_mode.attr,
262 &dev_attr_legacy_size_mb.attr,
263 &dev_attr_legacy_ue_count.attr,
264 &dev_attr_legacy_ce_count.attr,
265 NULL,
266 };
267
268 static const struct attribute_group csrow_attr_grp = {
269 .attrs = csrow_attrs,
270 };
271
272 static const struct attribute_group *csrow_attr_groups[] = {
273 &csrow_attr_grp,
274 NULL
275 };
276
277 static const struct device_type csrow_attr_type = {
278 .groups = csrow_attr_groups,
279 };
280
281 /*
282 * possible dynamic channel DIMM Label attribute files
283 *
284 */
285 DEVICE_CHANNEL(ch0_dimm_label, S_IRUGO | S_IWUSR,
286 channel_dimm_label_show, channel_dimm_label_store, 0);
287 DEVICE_CHANNEL(ch1_dimm_label, S_IRUGO | S_IWUSR,
288 channel_dimm_label_show, channel_dimm_label_store, 1);
289 DEVICE_CHANNEL(ch2_dimm_label, S_IRUGO | S_IWUSR,
290 channel_dimm_label_show, channel_dimm_label_store, 2);
291 DEVICE_CHANNEL(ch3_dimm_label, S_IRUGO | S_IWUSR,
292 channel_dimm_label_show, channel_dimm_label_store, 3);
293 DEVICE_CHANNEL(ch4_dimm_label, S_IRUGO | S_IWUSR,
294 channel_dimm_label_show, channel_dimm_label_store, 4);
295 DEVICE_CHANNEL(ch5_dimm_label, S_IRUGO | S_IWUSR,
296 channel_dimm_label_show, channel_dimm_label_store, 5);
297 DEVICE_CHANNEL(ch6_dimm_label, S_IRUGO | S_IWUSR,
298 channel_dimm_label_show, channel_dimm_label_store, 6);
299 DEVICE_CHANNEL(ch7_dimm_label, S_IRUGO | S_IWUSR,
300 channel_dimm_label_show, channel_dimm_label_store, 7);
301
302 /* Total possible dynamic DIMM Label attribute file table */
303 static struct attribute *dynamic_csrow_dimm_attr[] = {
304 &dev_attr_legacy_ch0_dimm_label.attr.attr,
305 &dev_attr_legacy_ch1_dimm_label.attr.attr,
306 &dev_attr_legacy_ch2_dimm_label.attr.attr,
307 &dev_attr_legacy_ch3_dimm_label.attr.attr,
308 &dev_attr_legacy_ch4_dimm_label.attr.attr,
309 &dev_attr_legacy_ch5_dimm_label.attr.attr,
310 &dev_attr_legacy_ch6_dimm_label.attr.attr,
311 &dev_attr_legacy_ch7_dimm_label.attr.attr,
312 NULL
313 };
314
315 /* possible dynamic channel ce_count attribute files */
316 DEVICE_CHANNEL(ch0_ce_count, S_IRUGO,
317 channel_ce_count_show, NULL, 0);
318 DEVICE_CHANNEL(ch1_ce_count, S_IRUGO,
319 channel_ce_count_show, NULL, 1);
320 DEVICE_CHANNEL(ch2_ce_count, S_IRUGO,
321 channel_ce_count_show, NULL, 2);
322 DEVICE_CHANNEL(ch3_ce_count, S_IRUGO,
323 channel_ce_count_show, NULL, 3);
324 DEVICE_CHANNEL(ch4_ce_count, S_IRUGO,
325 channel_ce_count_show, NULL, 4);
326 DEVICE_CHANNEL(ch5_ce_count, S_IRUGO,
327 channel_ce_count_show, NULL, 5);
328 DEVICE_CHANNEL(ch6_ce_count, S_IRUGO,
329 channel_ce_count_show, NULL, 6);
330 DEVICE_CHANNEL(ch7_ce_count, S_IRUGO,
331 channel_ce_count_show, NULL, 7);
332
333 /* Total possible dynamic ce_count attribute file table */
334 static struct attribute *dynamic_csrow_ce_count_attr[] = {
335 &dev_attr_legacy_ch0_ce_count.attr.attr,
336 &dev_attr_legacy_ch1_ce_count.attr.attr,
337 &dev_attr_legacy_ch2_ce_count.attr.attr,
338 &dev_attr_legacy_ch3_ce_count.attr.attr,
339 &dev_attr_legacy_ch4_ce_count.attr.attr,
340 &dev_attr_legacy_ch5_ce_count.attr.attr,
341 &dev_attr_legacy_ch6_ce_count.attr.attr,
342 &dev_attr_legacy_ch7_ce_count.attr.attr,
343 NULL
344 };
345
csrow_dev_is_visible(struct kobject * kobj,struct attribute * attr,int idx)346 static umode_t csrow_dev_is_visible(struct kobject *kobj,
347 struct attribute *attr, int idx)
348 {
349 struct device *dev = kobj_to_dev(kobj);
350 struct csrow_info *csrow = container_of(dev, struct csrow_info, dev);
351
352 if (idx >= csrow->nr_channels)
353 return 0;
354
355 if (idx >= ARRAY_SIZE(dynamic_csrow_ce_count_attr) - 1) {
356 WARN_ONCE(1, "idx: %d\n", idx);
357 return 0;
358 }
359
360 /* Only expose populated DIMMs */
361 if (!csrow->channels[idx]->dimm->nr_pages)
362 return 0;
363
364 return attr->mode;
365 }
366
367
368 static const struct attribute_group csrow_dev_dimm_group = {
369 .attrs = dynamic_csrow_dimm_attr,
370 .is_visible = csrow_dev_is_visible,
371 };
372
373 static const struct attribute_group csrow_dev_ce_count_group = {
374 .attrs = dynamic_csrow_ce_count_attr,
375 .is_visible = csrow_dev_is_visible,
376 };
377
378 static const struct attribute_group *csrow_dev_groups[] = {
379 &csrow_dev_dimm_group,
380 &csrow_dev_ce_count_group,
381 NULL
382 };
383
csrow_release(struct device * dev)384 static void csrow_release(struct device *dev)
385 {
386 /*
387 * Nothing to do, just unregister sysfs here. The mci
388 * device owns the data and will also release it.
389 */
390 }
391
nr_pages_per_csrow(struct csrow_info * csrow)392 static inline int nr_pages_per_csrow(struct csrow_info *csrow)
393 {
394 int chan, nr_pages = 0;
395
396 for (chan = 0; chan < csrow->nr_channels; chan++)
397 nr_pages += csrow->channels[chan]->dimm->nr_pages;
398
399 return nr_pages;
400 }
401
402 /* Create a CSROW object under specifed edac_mc_device */
edac_create_csrow_object(struct mem_ctl_info * mci,struct csrow_info * csrow,int index)403 static int edac_create_csrow_object(struct mem_ctl_info *mci,
404 struct csrow_info *csrow, int index)
405 {
406 int err;
407
408 csrow->dev.type = &csrow_attr_type;
409 csrow->dev.groups = csrow_dev_groups;
410 csrow->dev.release = csrow_release;
411 device_initialize(&csrow->dev);
412 csrow->dev.parent = &mci->dev;
413 csrow->mci = mci;
414 dev_set_name(&csrow->dev, "csrow%d", index);
415 dev_set_drvdata(&csrow->dev, csrow);
416
417 err = device_add(&csrow->dev);
418 if (err) {
419 edac_dbg(1, "failure: create device %s\n", dev_name(&csrow->dev));
420 put_device(&csrow->dev);
421 return err;
422 }
423
424 edac_dbg(0, "device %s created\n", dev_name(&csrow->dev));
425
426 return 0;
427 }
428
429 /* Create a CSROW object under specifed edac_mc_device */
edac_create_csrow_objects(struct mem_ctl_info * mci)430 static int edac_create_csrow_objects(struct mem_ctl_info *mci)
431 {
432 int err, i;
433 struct csrow_info *csrow;
434
435 for (i = 0; i < mci->nr_csrows; i++) {
436 csrow = mci->csrows[i];
437 if (!nr_pages_per_csrow(csrow))
438 continue;
439 err = edac_create_csrow_object(mci, mci->csrows[i], i);
440 if (err < 0)
441 goto error;
442 }
443 return 0;
444
445 error:
446 for (--i; i >= 0; i--) {
447 if (device_is_registered(&mci->csrows[i]->dev))
448 device_unregister(&mci->csrows[i]->dev);
449 }
450
451 return err;
452 }
453
edac_delete_csrow_objects(struct mem_ctl_info * mci)454 static void edac_delete_csrow_objects(struct mem_ctl_info *mci)
455 {
456 int i;
457
458 for (i = 0; i < mci->nr_csrows; i++) {
459 if (device_is_registered(&mci->csrows[i]->dev))
460 device_unregister(&mci->csrows[i]->dev);
461 }
462 }
463
464 #endif
465
466 /*
467 * Per-dimm (or per-rank) devices
468 */
469
470 #define to_dimm(k) container_of(k, struct dimm_info, dev)
471
472 /* show/store functions for DIMM Label attributes */
dimmdev_location_show(struct device * dev,struct device_attribute * mattr,char * data)473 static ssize_t dimmdev_location_show(struct device *dev,
474 struct device_attribute *mattr, char *data)
475 {
476 struct dimm_info *dimm = to_dimm(dev);
477 ssize_t count;
478
479 count = edac_dimm_info_location(dimm, data, PAGE_SIZE);
480 count += scnprintf(data + count, PAGE_SIZE - count, "\n");
481
482 return count;
483 }
484
dimmdev_label_show(struct device * dev,struct device_attribute * mattr,char * data)485 static ssize_t dimmdev_label_show(struct device *dev,
486 struct device_attribute *mattr, char *data)
487 {
488 struct dimm_info *dimm = to_dimm(dev);
489
490 /* if field has not been initialized, there is nothing to send */
491 if (!dimm->label[0])
492 return 0;
493
494 return snprintf(data, sizeof(dimm->label) + 1, "%s\n", dimm->label);
495 }
496
dimmdev_label_store(struct device * dev,struct device_attribute * mattr,const char * data,size_t count)497 static ssize_t dimmdev_label_store(struct device *dev,
498 struct device_attribute *mattr,
499 const char *data,
500 size_t count)
501 {
502 struct dimm_info *dimm = to_dimm(dev);
503 size_t copy_count = count;
504
505 if (count == 0)
506 return -EINVAL;
507
508 if (data[count - 1] == '\0' || data[count - 1] == '\n')
509 copy_count -= 1;
510
511 if (copy_count == 0 || copy_count >= sizeof(dimm->label))
512 return -EINVAL;
513
514 strncpy(dimm->label, data, copy_count);
515 dimm->label[copy_count] = '\0';
516
517 return count;
518 }
519
dimmdev_size_show(struct device * dev,struct device_attribute * mattr,char * data)520 static ssize_t dimmdev_size_show(struct device *dev,
521 struct device_attribute *mattr, char *data)
522 {
523 struct dimm_info *dimm = to_dimm(dev);
524
525 return sprintf(data, "%u\n", PAGES_TO_MiB(dimm->nr_pages));
526 }
527
dimmdev_mem_type_show(struct device * dev,struct device_attribute * mattr,char * data)528 static ssize_t dimmdev_mem_type_show(struct device *dev,
529 struct device_attribute *mattr, char *data)
530 {
531 struct dimm_info *dimm = to_dimm(dev);
532
533 return sprintf(data, "%s\n", edac_mem_types[dimm->mtype]);
534 }
535
dimmdev_dev_type_show(struct device * dev,struct device_attribute * mattr,char * data)536 static ssize_t dimmdev_dev_type_show(struct device *dev,
537 struct device_attribute *mattr, char *data)
538 {
539 struct dimm_info *dimm = to_dimm(dev);
540
541 return sprintf(data, "%s\n", dev_types[dimm->dtype]);
542 }
543
dimmdev_edac_mode_show(struct device * dev,struct device_attribute * mattr,char * data)544 static ssize_t dimmdev_edac_mode_show(struct device *dev,
545 struct device_attribute *mattr,
546 char *data)
547 {
548 struct dimm_info *dimm = to_dimm(dev);
549
550 return sprintf(data, "%s\n", edac_caps[dimm->edac_mode]);
551 }
552
dimmdev_ce_count_show(struct device * dev,struct device_attribute * mattr,char * data)553 static ssize_t dimmdev_ce_count_show(struct device *dev,
554 struct device_attribute *mattr,
555 char *data)
556 {
557 struct dimm_info *dimm = to_dimm(dev);
558
559 return sprintf(data, "%u\n", dimm->ce_count);
560 }
561
dimmdev_ue_count_show(struct device * dev,struct device_attribute * mattr,char * data)562 static ssize_t dimmdev_ue_count_show(struct device *dev,
563 struct device_attribute *mattr,
564 char *data)
565 {
566 struct dimm_info *dimm = to_dimm(dev);
567
568 return sprintf(data, "%u\n", dimm->ue_count);
569 }
570
571 /* dimm/rank attribute files */
572 static DEVICE_ATTR(dimm_label, S_IRUGO | S_IWUSR,
573 dimmdev_label_show, dimmdev_label_store);
574 static DEVICE_ATTR(dimm_location, S_IRUGO, dimmdev_location_show, NULL);
575 static DEVICE_ATTR(size, S_IRUGO, dimmdev_size_show, NULL);
576 static DEVICE_ATTR(dimm_mem_type, S_IRUGO, dimmdev_mem_type_show, NULL);
577 static DEVICE_ATTR(dimm_dev_type, S_IRUGO, dimmdev_dev_type_show, NULL);
578 static DEVICE_ATTR(dimm_edac_mode, S_IRUGO, dimmdev_edac_mode_show, NULL);
579 static DEVICE_ATTR(dimm_ce_count, S_IRUGO, dimmdev_ce_count_show, NULL);
580 static DEVICE_ATTR(dimm_ue_count, S_IRUGO, dimmdev_ue_count_show, NULL);
581
582 /* attributes of the dimm<id>/rank<id> object */
583 static struct attribute *dimm_attrs[] = {
584 &dev_attr_dimm_label.attr,
585 &dev_attr_dimm_location.attr,
586 &dev_attr_size.attr,
587 &dev_attr_dimm_mem_type.attr,
588 &dev_attr_dimm_dev_type.attr,
589 &dev_attr_dimm_edac_mode.attr,
590 &dev_attr_dimm_ce_count.attr,
591 &dev_attr_dimm_ue_count.attr,
592 NULL,
593 };
594
595 static const struct attribute_group dimm_attr_grp = {
596 .attrs = dimm_attrs,
597 };
598
599 static const struct attribute_group *dimm_attr_groups[] = {
600 &dimm_attr_grp,
601 NULL
602 };
603
604 static const struct device_type dimm_attr_type = {
605 .groups = dimm_attr_groups,
606 };
607
dimm_release(struct device * dev)608 static void dimm_release(struct device *dev)
609 {
610 /*
611 * Nothing to do, just unregister sysfs here. The mci
612 * device owns the data and will also release it.
613 */
614 }
615
616 /* Create a DIMM object under specifed memory controller device */
edac_create_dimm_object(struct mem_ctl_info * mci,struct dimm_info * dimm)617 static int edac_create_dimm_object(struct mem_ctl_info *mci,
618 struct dimm_info *dimm)
619 {
620 int err;
621 dimm->mci = mci;
622
623 dimm->dev.type = &dimm_attr_type;
624 dimm->dev.release = dimm_release;
625 device_initialize(&dimm->dev);
626
627 dimm->dev.parent = &mci->dev;
628 if (mci->csbased)
629 dev_set_name(&dimm->dev, "rank%d", dimm->idx);
630 else
631 dev_set_name(&dimm->dev, "dimm%d", dimm->idx);
632 dev_set_drvdata(&dimm->dev, dimm);
633 pm_runtime_forbid(&mci->dev);
634
635 err = device_add(&dimm->dev);
636 if (err) {
637 edac_dbg(1, "failure: create device %s\n", dev_name(&dimm->dev));
638 put_device(&dimm->dev);
639 return err;
640 }
641
642 if (IS_ENABLED(CONFIG_EDAC_DEBUG)) {
643 char location[80];
644
645 edac_dimm_info_location(dimm, location, sizeof(location));
646 edac_dbg(0, "device %s created at location %s\n",
647 dev_name(&dimm->dev), location);
648 }
649
650 return 0;
651 }
652
653 /*
654 * Memory controller device
655 */
656
657 #define to_mci(k) container_of(k, struct mem_ctl_info, dev)
658
mci_reset_counters_store(struct device * dev,struct device_attribute * mattr,const char * data,size_t count)659 static ssize_t mci_reset_counters_store(struct device *dev,
660 struct device_attribute *mattr,
661 const char *data, size_t count)
662 {
663 struct mem_ctl_info *mci = to_mci(dev);
664 struct dimm_info *dimm;
665 int row, chan;
666
667 mci->ue_mc = 0;
668 mci->ce_mc = 0;
669 mci->ue_noinfo_count = 0;
670 mci->ce_noinfo_count = 0;
671
672 for (row = 0; row < mci->nr_csrows; row++) {
673 struct csrow_info *ri = mci->csrows[row];
674
675 ri->ue_count = 0;
676 ri->ce_count = 0;
677
678 for (chan = 0; chan < ri->nr_channels; chan++)
679 ri->channels[chan]->ce_count = 0;
680 }
681
682 mci_for_each_dimm(mci, dimm) {
683 dimm->ue_count = 0;
684 dimm->ce_count = 0;
685 }
686
687 mci->start_time = jiffies;
688 return count;
689 }
690
691 /* Memory scrubbing interface:
692 *
693 * A MC driver can limit the scrubbing bandwidth based on the CPU type.
694 * Therefore, ->set_sdram_scrub_rate should be made to return the actual
695 * bandwidth that is accepted or 0 when scrubbing is to be disabled.
696 *
697 * Negative value still means that an error has occurred while setting
698 * the scrub rate.
699 */
mci_sdram_scrub_rate_store(struct device * dev,struct device_attribute * mattr,const char * data,size_t count)700 static ssize_t mci_sdram_scrub_rate_store(struct device *dev,
701 struct device_attribute *mattr,
702 const char *data, size_t count)
703 {
704 struct mem_ctl_info *mci = to_mci(dev);
705 unsigned long bandwidth = 0;
706 int new_bw = 0;
707
708 if (kstrtoul(data, 10, &bandwidth) < 0)
709 return -EINVAL;
710
711 new_bw = mci->set_sdram_scrub_rate(mci, bandwidth);
712 if (new_bw < 0) {
713 edac_printk(KERN_WARNING, EDAC_MC,
714 "Error setting scrub rate to: %lu\n", bandwidth);
715 return -EINVAL;
716 }
717
718 return count;
719 }
720
721 /*
722 * ->get_sdram_scrub_rate() return value semantics same as above.
723 */
mci_sdram_scrub_rate_show(struct device * dev,struct device_attribute * mattr,char * data)724 static ssize_t mci_sdram_scrub_rate_show(struct device *dev,
725 struct device_attribute *mattr,
726 char *data)
727 {
728 struct mem_ctl_info *mci = to_mci(dev);
729 int bandwidth = 0;
730
731 bandwidth = mci->get_sdram_scrub_rate(mci);
732 if (bandwidth < 0) {
733 edac_printk(KERN_DEBUG, EDAC_MC, "Error reading scrub rate\n");
734 return bandwidth;
735 }
736
737 return sprintf(data, "%d\n", bandwidth);
738 }
739
740 /* default attribute files for the MCI object */
mci_ue_count_show(struct device * dev,struct device_attribute * mattr,char * data)741 static ssize_t mci_ue_count_show(struct device *dev,
742 struct device_attribute *mattr,
743 char *data)
744 {
745 struct mem_ctl_info *mci = to_mci(dev);
746
747 return sprintf(data, "%d\n", mci->ue_mc);
748 }
749
mci_ce_count_show(struct device * dev,struct device_attribute * mattr,char * data)750 static ssize_t mci_ce_count_show(struct device *dev,
751 struct device_attribute *mattr,
752 char *data)
753 {
754 struct mem_ctl_info *mci = to_mci(dev);
755
756 return sprintf(data, "%d\n", mci->ce_mc);
757 }
758
mci_ce_noinfo_show(struct device * dev,struct device_attribute * mattr,char * data)759 static ssize_t mci_ce_noinfo_show(struct device *dev,
760 struct device_attribute *mattr,
761 char *data)
762 {
763 struct mem_ctl_info *mci = to_mci(dev);
764
765 return sprintf(data, "%d\n", mci->ce_noinfo_count);
766 }
767
mci_ue_noinfo_show(struct device * dev,struct device_attribute * mattr,char * data)768 static ssize_t mci_ue_noinfo_show(struct device *dev,
769 struct device_attribute *mattr,
770 char *data)
771 {
772 struct mem_ctl_info *mci = to_mci(dev);
773
774 return sprintf(data, "%d\n", mci->ue_noinfo_count);
775 }
776
mci_seconds_show(struct device * dev,struct device_attribute * mattr,char * data)777 static ssize_t mci_seconds_show(struct device *dev,
778 struct device_attribute *mattr,
779 char *data)
780 {
781 struct mem_ctl_info *mci = to_mci(dev);
782
783 return sprintf(data, "%ld\n", (jiffies - mci->start_time) / HZ);
784 }
785
mci_ctl_name_show(struct device * dev,struct device_attribute * mattr,char * data)786 static ssize_t mci_ctl_name_show(struct device *dev,
787 struct device_attribute *mattr,
788 char *data)
789 {
790 struct mem_ctl_info *mci = to_mci(dev);
791
792 return sprintf(data, "%s\n", mci->ctl_name);
793 }
794
mci_size_mb_show(struct device * dev,struct device_attribute * mattr,char * data)795 static ssize_t mci_size_mb_show(struct device *dev,
796 struct device_attribute *mattr,
797 char *data)
798 {
799 struct mem_ctl_info *mci = to_mci(dev);
800 int total_pages = 0, csrow_idx, j;
801
802 for (csrow_idx = 0; csrow_idx < mci->nr_csrows; csrow_idx++) {
803 struct csrow_info *csrow = mci->csrows[csrow_idx];
804
805 for (j = 0; j < csrow->nr_channels; j++) {
806 struct dimm_info *dimm = csrow->channels[j]->dimm;
807
808 total_pages += dimm->nr_pages;
809 }
810 }
811
812 return sprintf(data, "%u\n", PAGES_TO_MiB(total_pages));
813 }
814
mci_max_location_show(struct device * dev,struct device_attribute * mattr,char * data)815 static ssize_t mci_max_location_show(struct device *dev,
816 struct device_attribute *mattr,
817 char *data)
818 {
819 struct mem_ctl_info *mci = to_mci(dev);
820 int len = PAGE_SIZE;
821 char *p = data;
822 int i, n;
823
824 for (i = 0; i < mci->n_layers; i++) {
825 n = scnprintf(p, len, "%s %d ",
826 edac_layer_name[mci->layers[i].type],
827 mci->layers[i].size - 1);
828 len -= n;
829 if (len <= 0)
830 goto out;
831
832 p += n;
833 }
834
835 p += scnprintf(p, len, "\n");
836 out:
837 return p - data;
838 }
839
840 /* default Control file */
841 static DEVICE_ATTR(reset_counters, S_IWUSR, NULL, mci_reset_counters_store);
842
843 /* default Attribute files */
844 static DEVICE_ATTR(mc_name, S_IRUGO, mci_ctl_name_show, NULL);
845 static DEVICE_ATTR(size_mb, S_IRUGO, mci_size_mb_show, NULL);
846 static DEVICE_ATTR(seconds_since_reset, S_IRUGO, mci_seconds_show, NULL);
847 static DEVICE_ATTR(ue_noinfo_count, S_IRUGO, mci_ue_noinfo_show, NULL);
848 static DEVICE_ATTR(ce_noinfo_count, S_IRUGO, mci_ce_noinfo_show, NULL);
849 static DEVICE_ATTR(ue_count, S_IRUGO, mci_ue_count_show, NULL);
850 static DEVICE_ATTR(ce_count, S_IRUGO, mci_ce_count_show, NULL);
851 static DEVICE_ATTR(max_location, S_IRUGO, mci_max_location_show, NULL);
852
853 /* memory scrubber attribute file */
854 static DEVICE_ATTR(sdram_scrub_rate, 0, mci_sdram_scrub_rate_show,
855 mci_sdram_scrub_rate_store); /* umode set later in is_visible */
856
857 static struct attribute *mci_attrs[] = {
858 &dev_attr_reset_counters.attr,
859 &dev_attr_mc_name.attr,
860 &dev_attr_size_mb.attr,
861 &dev_attr_seconds_since_reset.attr,
862 &dev_attr_ue_noinfo_count.attr,
863 &dev_attr_ce_noinfo_count.attr,
864 &dev_attr_ue_count.attr,
865 &dev_attr_ce_count.attr,
866 &dev_attr_max_location.attr,
867 &dev_attr_sdram_scrub_rate.attr,
868 NULL
869 };
870
mci_attr_is_visible(struct kobject * kobj,struct attribute * attr,int idx)871 static umode_t mci_attr_is_visible(struct kobject *kobj,
872 struct attribute *attr, int idx)
873 {
874 struct device *dev = kobj_to_dev(kobj);
875 struct mem_ctl_info *mci = to_mci(dev);
876 umode_t mode = 0;
877
878 if (attr != &dev_attr_sdram_scrub_rate.attr)
879 return attr->mode;
880 if (mci->get_sdram_scrub_rate)
881 mode |= S_IRUGO;
882 if (mci->set_sdram_scrub_rate)
883 mode |= S_IWUSR;
884 return mode;
885 }
886
887 static const struct attribute_group mci_attr_grp = {
888 .attrs = mci_attrs,
889 .is_visible = mci_attr_is_visible,
890 };
891
892 static const struct attribute_group *mci_attr_groups[] = {
893 &mci_attr_grp,
894 NULL
895 };
896
897 static const struct device_type mci_attr_type = {
898 .groups = mci_attr_groups,
899 };
900
901 /*
902 * Create a new Memory Controller kobject instance,
903 * mc<id> under the 'mc' directory
904 *
905 * Return:
906 * 0 Success
907 * !0 Failure
908 */
edac_create_sysfs_mci_device(struct mem_ctl_info * mci,const struct attribute_group ** groups)909 int edac_create_sysfs_mci_device(struct mem_ctl_info *mci,
910 const struct attribute_group **groups)
911 {
912 struct dimm_info *dimm;
913 int err;
914
915 /* get the /sys/devices/system/edac subsys reference */
916 mci->dev.type = &mci_attr_type;
917 mci->dev.parent = mci_pdev;
918 mci->dev.groups = groups;
919 dev_set_name(&mci->dev, "mc%d", mci->mc_idx);
920 dev_set_drvdata(&mci->dev, mci);
921 pm_runtime_forbid(&mci->dev);
922
923 err = device_add(&mci->dev);
924 if (err < 0) {
925 edac_dbg(1, "failure: create device %s\n", dev_name(&mci->dev));
926 /* no put_device() here, free mci with _edac_mc_free() */
927 return err;
928 }
929
930 edac_dbg(0, "device %s created\n", dev_name(&mci->dev));
931
932 /*
933 * Create the dimm/rank devices
934 */
935 mci_for_each_dimm(mci, dimm) {
936 /* Only expose populated DIMMs */
937 if (!dimm->nr_pages)
938 continue;
939
940 err = edac_create_dimm_object(mci, dimm);
941 if (err)
942 goto fail;
943 }
944
945 #ifdef CONFIG_EDAC_LEGACY_SYSFS
946 err = edac_create_csrow_objects(mci);
947 if (err < 0)
948 goto fail;
949 #endif
950
951 edac_create_debugfs_nodes(mci);
952 return 0;
953
954 fail:
955 edac_remove_sysfs_mci_device(mci);
956
957 return err;
958 }
959
960 /*
961 * remove a Memory Controller instance
962 */
edac_remove_sysfs_mci_device(struct mem_ctl_info * mci)963 void edac_remove_sysfs_mci_device(struct mem_ctl_info *mci)
964 {
965 struct dimm_info *dimm;
966
967 if (!device_is_registered(&mci->dev))
968 return;
969
970 edac_dbg(0, "\n");
971
972 #ifdef CONFIG_EDAC_DEBUG
973 edac_debugfs_remove_recursive(mci->debugfs);
974 #endif
975 #ifdef CONFIG_EDAC_LEGACY_SYSFS
976 edac_delete_csrow_objects(mci);
977 #endif
978
979 mci_for_each_dimm(mci, dimm) {
980 if (!device_is_registered(&dimm->dev))
981 continue;
982 edac_dbg(1, "unregistering device %s\n", dev_name(&dimm->dev));
983 device_unregister(&dimm->dev);
984 }
985
986 /* only remove the device, but keep mci */
987 device_del(&mci->dev);
988 }
989
mc_attr_release(struct device * dev)990 static void mc_attr_release(struct device *dev)
991 {
992 /*
993 * There's no container structure here, as this is just the mci
994 * parent device, used to create the /sys/devices/mc sysfs node.
995 * So, there are no attributes on it.
996 */
997 edac_dbg(1, "device %s released\n", dev_name(dev));
998 kfree(dev);
999 }
1000
1001 /*
1002 * Init/exit code for the module. Basically, creates/removes /sys/class/rc
1003 */
edac_mc_sysfs_init(void)1004 int __init edac_mc_sysfs_init(void)
1005 {
1006 int err;
1007
1008 mci_pdev = kzalloc(sizeof(*mci_pdev), GFP_KERNEL);
1009 if (!mci_pdev)
1010 return -ENOMEM;
1011
1012 mci_pdev->bus = edac_get_sysfs_subsys();
1013 mci_pdev->release = mc_attr_release;
1014 mci_pdev->init_name = "mc";
1015
1016 err = device_register(mci_pdev);
1017 if (err < 0) {
1018 edac_dbg(1, "failure: create device %s\n", dev_name(mci_pdev));
1019 put_device(mci_pdev);
1020 return err;
1021 }
1022
1023 edac_dbg(0, "device %s created\n", dev_name(mci_pdev));
1024
1025 return 0;
1026 }
1027
edac_mc_sysfs_exit(void)1028 void edac_mc_sysfs_exit(void)
1029 {
1030 device_unregister(mci_pdev);
1031 }
1032