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
csrow_attr_release(struct device * dev)277 static void csrow_attr_release(struct device *dev)
278 {
279 struct csrow_info *csrow = container_of(dev, struct csrow_info, dev);
280
281 edac_dbg(1, "device %s released\n", dev_name(dev));
282 kfree(csrow);
283 }
284
285 static const struct device_type csrow_attr_type = {
286 .groups = csrow_attr_groups,
287 .release = csrow_attr_release,
288 };
289
290 /*
291 * possible dynamic channel DIMM Label attribute files
292 *
293 */
294 DEVICE_CHANNEL(ch0_dimm_label, S_IRUGO | S_IWUSR,
295 channel_dimm_label_show, channel_dimm_label_store, 0);
296 DEVICE_CHANNEL(ch1_dimm_label, S_IRUGO | S_IWUSR,
297 channel_dimm_label_show, channel_dimm_label_store, 1);
298 DEVICE_CHANNEL(ch2_dimm_label, S_IRUGO | S_IWUSR,
299 channel_dimm_label_show, channel_dimm_label_store, 2);
300 DEVICE_CHANNEL(ch3_dimm_label, S_IRUGO | S_IWUSR,
301 channel_dimm_label_show, channel_dimm_label_store, 3);
302 DEVICE_CHANNEL(ch4_dimm_label, S_IRUGO | S_IWUSR,
303 channel_dimm_label_show, channel_dimm_label_store, 4);
304 DEVICE_CHANNEL(ch5_dimm_label, S_IRUGO | S_IWUSR,
305 channel_dimm_label_show, channel_dimm_label_store, 5);
306 DEVICE_CHANNEL(ch6_dimm_label, S_IRUGO | S_IWUSR,
307 channel_dimm_label_show, channel_dimm_label_store, 6);
308 DEVICE_CHANNEL(ch7_dimm_label, S_IRUGO | S_IWUSR,
309 channel_dimm_label_show, channel_dimm_label_store, 7);
310
311 /* Total possible dynamic DIMM Label attribute file table */
312 static struct attribute *dynamic_csrow_dimm_attr[] = {
313 &dev_attr_legacy_ch0_dimm_label.attr.attr,
314 &dev_attr_legacy_ch1_dimm_label.attr.attr,
315 &dev_attr_legacy_ch2_dimm_label.attr.attr,
316 &dev_attr_legacy_ch3_dimm_label.attr.attr,
317 &dev_attr_legacy_ch4_dimm_label.attr.attr,
318 &dev_attr_legacy_ch5_dimm_label.attr.attr,
319 &dev_attr_legacy_ch6_dimm_label.attr.attr,
320 &dev_attr_legacy_ch7_dimm_label.attr.attr,
321 NULL
322 };
323
324 /* possible dynamic channel ce_count attribute files */
325 DEVICE_CHANNEL(ch0_ce_count, S_IRUGO,
326 channel_ce_count_show, NULL, 0);
327 DEVICE_CHANNEL(ch1_ce_count, S_IRUGO,
328 channel_ce_count_show, NULL, 1);
329 DEVICE_CHANNEL(ch2_ce_count, S_IRUGO,
330 channel_ce_count_show, NULL, 2);
331 DEVICE_CHANNEL(ch3_ce_count, S_IRUGO,
332 channel_ce_count_show, NULL, 3);
333 DEVICE_CHANNEL(ch4_ce_count, S_IRUGO,
334 channel_ce_count_show, NULL, 4);
335 DEVICE_CHANNEL(ch5_ce_count, S_IRUGO,
336 channel_ce_count_show, NULL, 5);
337 DEVICE_CHANNEL(ch6_ce_count, S_IRUGO,
338 channel_ce_count_show, NULL, 6);
339 DEVICE_CHANNEL(ch7_ce_count, S_IRUGO,
340 channel_ce_count_show, NULL, 7);
341
342 /* Total possible dynamic ce_count attribute file table */
343 static struct attribute *dynamic_csrow_ce_count_attr[] = {
344 &dev_attr_legacy_ch0_ce_count.attr.attr,
345 &dev_attr_legacy_ch1_ce_count.attr.attr,
346 &dev_attr_legacy_ch2_ce_count.attr.attr,
347 &dev_attr_legacy_ch3_ce_count.attr.attr,
348 &dev_attr_legacy_ch4_ce_count.attr.attr,
349 &dev_attr_legacy_ch5_ce_count.attr.attr,
350 &dev_attr_legacy_ch6_ce_count.attr.attr,
351 &dev_attr_legacy_ch7_ce_count.attr.attr,
352 NULL
353 };
354
csrow_dev_is_visible(struct kobject * kobj,struct attribute * attr,int idx)355 static umode_t csrow_dev_is_visible(struct kobject *kobj,
356 struct attribute *attr, int idx)
357 {
358 struct device *dev = kobj_to_dev(kobj);
359 struct csrow_info *csrow = container_of(dev, struct csrow_info, dev);
360
361 if (idx >= csrow->nr_channels)
362 return 0;
363
364 if (idx >= ARRAY_SIZE(dynamic_csrow_ce_count_attr) - 1) {
365 WARN_ONCE(1, "idx: %d\n", idx);
366 return 0;
367 }
368
369 /* Only expose populated DIMMs */
370 if (!csrow->channels[idx]->dimm->nr_pages)
371 return 0;
372
373 return attr->mode;
374 }
375
376
377 static const struct attribute_group csrow_dev_dimm_group = {
378 .attrs = dynamic_csrow_dimm_attr,
379 .is_visible = csrow_dev_is_visible,
380 };
381
382 static const struct attribute_group csrow_dev_ce_count_group = {
383 .attrs = dynamic_csrow_ce_count_attr,
384 .is_visible = csrow_dev_is_visible,
385 };
386
387 static const struct attribute_group *csrow_dev_groups[] = {
388 &csrow_dev_dimm_group,
389 &csrow_dev_ce_count_group,
390 NULL
391 };
392
nr_pages_per_csrow(struct csrow_info * csrow)393 static inline int nr_pages_per_csrow(struct csrow_info *csrow)
394 {
395 int chan, nr_pages = 0;
396
397 for (chan = 0; chan < csrow->nr_channels; chan++)
398 nr_pages += csrow->channels[chan]->dimm->nr_pages;
399
400 return nr_pages;
401 }
402
403 /* Create a CSROW object under specifed edac_mc_device */
edac_create_csrow_object(struct mem_ctl_info * mci,struct csrow_info * csrow,int index)404 static int edac_create_csrow_object(struct mem_ctl_info *mci,
405 struct csrow_info *csrow, int index)
406 {
407 int err;
408
409 csrow->dev.type = &csrow_attr_type;
410 csrow->dev.groups = csrow_dev_groups;
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 csrow = mci->csrows[i];
448 if (!nr_pages_per_csrow(csrow))
449 continue;
450
451 device_del(&mci->csrows[i]->dev);
452 }
453
454 return err;
455 }
456
edac_delete_csrow_objects(struct mem_ctl_info * mci)457 static void edac_delete_csrow_objects(struct mem_ctl_info *mci)
458 {
459 int i;
460 struct csrow_info *csrow;
461
462 for (i = mci->nr_csrows - 1; i >= 0; i--) {
463 csrow = mci->csrows[i];
464 if (!nr_pages_per_csrow(csrow))
465 continue;
466 device_unregister(&mci->csrows[i]->dev);
467 }
468 }
469 #endif
470
471 /*
472 * Per-dimm (or per-rank) devices
473 */
474
475 #define to_dimm(k) container_of(k, struct dimm_info, dev)
476
477 /* show/store functions for DIMM Label attributes */
dimmdev_location_show(struct device * dev,struct device_attribute * mattr,char * data)478 static ssize_t dimmdev_location_show(struct device *dev,
479 struct device_attribute *mattr, char *data)
480 {
481 struct dimm_info *dimm = to_dimm(dev);
482
483 return edac_dimm_info_location(dimm, data, PAGE_SIZE);
484 }
485
dimmdev_label_show(struct device * dev,struct device_attribute * mattr,char * data)486 static ssize_t dimmdev_label_show(struct device *dev,
487 struct device_attribute *mattr, char *data)
488 {
489 struct dimm_info *dimm = to_dimm(dev);
490
491 /* if field has not been initialized, there is nothing to send */
492 if (!dimm->label[0])
493 return 0;
494
495 return snprintf(data, sizeof(dimm->label) + 1, "%s\n", dimm->label);
496 }
497
dimmdev_label_store(struct device * dev,struct device_attribute * mattr,const char * data,size_t count)498 static ssize_t dimmdev_label_store(struct device *dev,
499 struct device_attribute *mattr,
500 const char *data,
501 size_t count)
502 {
503 struct dimm_info *dimm = to_dimm(dev);
504 size_t copy_count = count;
505
506 if (count == 0)
507 return -EINVAL;
508
509 if (data[count - 1] == '\0' || data[count - 1] == '\n')
510 copy_count -= 1;
511
512 if (copy_count == 0 || copy_count >= sizeof(dimm->label))
513 return -EINVAL;
514
515 strncpy(dimm->label, data, copy_count);
516 dimm->label[copy_count] = '\0';
517
518 return count;
519 }
520
dimmdev_size_show(struct device * dev,struct device_attribute * mattr,char * data)521 static ssize_t dimmdev_size_show(struct device *dev,
522 struct device_attribute *mattr, char *data)
523 {
524 struct dimm_info *dimm = to_dimm(dev);
525
526 return sprintf(data, "%u\n", PAGES_TO_MiB(dimm->nr_pages));
527 }
528
dimmdev_mem_type_show(struct device * dev,struct device_attribute * mattr,char * data)529 static ssize_t dimmdev_mem_type_show(struct device *dev,
530 struct device_attribute *mattr, char *data)
531 {
532 struct dimm_info *dimm = to_dimm(dev);
533
534 return sprintf(data, "%s\n", edac_mem_types[dimm->mtype]);
535 }
536
dimmdev_dev_type_show(struct device * dev,struct device_attribute * mattr,char * data)537 static ssize_t dimmdev_dev_type_show(struct device *dev,
538 struct device_attribute *mattr, char *data)
539 {
540 struct dimm_info *dimm = to_dimm(dev);
541
542 return sprintf(data, "%s\n", dev_types[dimm->dtype]);
543 }
544
dimmdev_edac_mode_show(struct device * dev,struct device_attribute * mattr,char * data)545 static ssize_t dimmdev_edac_mode_show(struct device *dev,
546 struct device_attribute *mattr,
547 char *data)
548 {
549 struct dimm_info *dimm = to_dimm(dev);
550
551 return sprintf(data, "%s\n", edac_caps[dimm->edac_mode]);
552 }
553
dimmdev_ce_count_show(struct device * dev,struct device_attribute * mattr,char * data)554 static ssize_t dimmdev_ce_count_show(struct device *dev,
555 struct device_attribute *mattr,
556 char *data)
557 {
558 struct dimm_info *dimm = to_dimm(dev);
559 u32 count;
560 int off;
561
562 off = EDAC_DIMM_OFF(dimm->mci->layers,
563 dimm->mci->n_layers,
564 dimm->location[0],
565 dimm->location[1],
566 dimm->location[2]);
567 count = dimm->mci->ce_per_layer[dimm->mci->n_layers-1][off];
568 return sprintf(data, "%u\n", count);
569 }
570
dimmdev_ue_count_show(struct device * dev,struct device_attribute * mattr,char * data)571 static ssize_t dimmdev_ue_count_show(struct device *dev,
572 struct device_attribute *mattr,
573 char *data)
574 {
575 struct dimm_info *dimm = to_dimm(dev);
576 u32 count;
577 int off;
578
579 off = EDAC_DIMM_OFF(dimm->mci->layers,
580 dimm->mci->n_layers,
581 dimm->location[0],
582 dimm->location[1],
583 dimm->location[2]);
584 count = dimm->mci->ue_per_layer[dimm->mci->n_layers-1][off];
585 return sprintf(data, "%u\n", count);
586 }
587
588 /* dimm/rank attribute files */
589 static DEVICE_ATTR(dimm_label, S_IRUGO | S_IWUSR,
590 dimmdev_label_show, dimmdev_label_store);
591 static DEVICE_ATTR(dimm_location, S_IRUGO, dimmdev_location_show, NULL);
592 static DEVICE_ATTR(size, S_IRUGO, dimmdev_size_show, NULL);
593 static DEVICE_ATTR(dimm_mem_type, S_IRUGO, dimmdev_mem_type_show, NULL);
594 static DEVICE_ATTR(dimm_dev_type, S_IRUGO, dimmdev_dev_type_show, NULL);
595 static DEVICE_ATTR(dimm_edac_mode, S_IRUGO, dimmdev_edac_mode_show, NULL);
596 static DEVICE_ATTR(dimm_ce_count, S_IRUGO, dimmdev_ce_count_show, NULL);
597 static DEVICE_ATTR(dimm_ue_count, S_IRUGO, dimmdev_ue_count_show, NULL);
598
599 /* attributes of the dimm<id>/rank<id> object */
600 static struct attribute *dimm_attrs[] = {
601 &dev_attr_dimm_label.attr,
602 &dev_attr_dimm_location.attr,
603 &dev_attr_size.attr,
604 &dev_attr_dimm_mem_type.attr,
605 &dev_attr_dimm_dev_type.attr,
606 &dev_attr_dimm_edac_mode.attr,
607 &dev_attr_dimm_ce_count.attr,
608 &dev_attr_dimm_ue_count.attr,
609 NULL,
610 };
611
612 static const struct attribute_group dimm_attr_grp = {
613 .attrs = dimm_attrs,
614 };
615
616 static const struct attribute_group *dimm_attr_groups[] = {
617 &dimm_attr_grp,
618 NULL
619 };
620
dimm_attr_release(struct device * dev)621 static void dimm_attr_release(struct device *dev)
622 {
623 struct dimm_info *dimm = container_of(dev, struct dimm_info, dev);
624
625 edac_dbg(1, "device %s released\n", dev_name(dev));
626 kfree(dimm);
627 }
628
629 static const struct device_type dimm_attr_type = {
630 .groups = dimm_attr_groups,
631 .release = dimm_attr_release,
632 };
633
634 /* Create a DIMM object under specifed memory controller device */
edac_create_dimm_object(struct mem_ctl_info * mci,struct dimm_info * dimm,int index)635 static int edac_create_dimm_object(struct mem_ctl_info *mci,
636 struct dimm_info *dimm,
637 int index)
638 {
639 int err;
640 dimm->mci = mci;
641
642 dimm->dev.type = &dimm_attr_type;
643 device_initialize(&dimm->dev);
644
645 dimm->dev.parent = &mci->dev;
646 if (mci->csbased)
647 dev_set_name(&dimm->dev, "rank%d", index);
648 else
649 dev_set_name(&dimm->dev, "dimm%d", index);
650 dev_set_drvdata(&dimm->dev, dimm);
651 pm_runtime_forbid(&mci->dev);
652
653 err = device_add(&dimm->dev);
654 if (err) {
655 edac_dbg(1, "failure: create device %s\n", dev_name(&dimm->dev));
656 put_device(&dimm->dev);
657 return err;
658 }
659
660 if (IS_ENABLED(CONFIG_EDAC_DEBUG)) {
661 char location[80];
662
663 edac_dimm_info_location(dimm, location, sizeof(location));
664 edac_dbg(0, "device %s created at location %s\n",
665 dev_name(&dimm->dev), location);
666 }
667
668 return 0;
669 }
670
671 /*
672 * Memory controller device
673 */
674
675 #define to_mci(k) container_of(k, struct mem_ctl_info, dev)
676
mci_reset_counters_store(struct device * dev,struct device_attribute * mattr,const char * data,size_t count)677 static ssize_t mci_reset_counters_store(struct device *dev,
678 struct device_attribute *mattr,
679 const char *data, size_t count)
680 {
681 struct mem_ctl_info *mci = to_mci(dev);
682 int cnt, row, chan, i;
683 mci->ue_mc = 0;
684 mci->ce_mc = 0;
685 mci->ue_noinfo_count = 0;
686 mci->ce_noinfo_count = 0;
687
688 for (row = 0; row < mci->nr_csrows; row++) {
689 struct csrow_info *ri = mci->csrows[row];
690
691 ri->ue_count = 0;
692 ri->ce_count = 0;
693
694 for (chan = 0; chan < ri->nr_channels; chan++)
695 ri->channels[chan]->ce_count = 0;
696 }
697
698 cnt = 1;
699 for (i = 0; i < mci->n_layers; i++) {
700 cnt *= mci->layers[i].size;
701 memset(mci->ce_per_layer[i], 0, cnt * sizeof(u32));
702 memset(mci->ue_per_layer[i], 0, cnt * sizeof(u32));
703 }
704
705 mci->start_time = jiffies;
706 return count;
707 }
708
709 /* Memory scrubbing interface:
710 *
711 * A MC driver can limit the scrubbing bandwidth based on the CPU type.
712 * Therefore, ->set_sdram_scrub_rate should be made to return the actual
713 * bandwidth that is accepted or 0 when scrubbing is to be disabled.
714 *
715 * Negative value still means that an error has occurred while setting
716 * the scrub rate.
717 */
mci_sdram_scrub_rate_store(struct device * dev,struct device_attribute * mattr,const char * data,size_t count)718 static ssize_t mci_sdram_scrub_rate_store(struct device *dev,
719 struct device_attribute *mattr,
720 const char *data, size_t count)
721 {
722 struct mem_ctl_info *mci = to_mci(dev);
723 unsigned long bandwidth = 0;
724 int new_bw = 0;
725
726 if (kstrtoul(data, 10, &bandwidth) < 0)
727 return -EINVAL;
728
729 new_bw = mci->set_sdram_scrub_rate(mci, bandwidth);
730 if (new_bw < 0) {
731 edac_printk(KERN_WARNING, EDAC_MC,
732 "Error setting scrub rate to: %lu\n", bandwidth);
733 return -EINVAL;
734 }
735
736 return count;
737 }
738
739 /*
740 * ->get_sdram_scrub_rate() return value semantics same as above.
741 */
mci_sdram_scrub_rate_show(struct device * dev,struct device_attribute * mattr,char * data)742 static ssize_t mci_sdram_scrub_rate_show(struct device *dev,
743 struct device_attribute *mattr,
744 char *data)
745 {
746 struct mem_ctl_info *mci = to_mci(dev);
747 int bandwidth = 0;
748
749 bandwidth = mci->get_sdram_scrub_rate(mci);
750 if (bandwidth < 0) {
751 edac_printk(KERN_DEBUG, EDAC_MC, "Error reading scrub rate\n");
752 return bandwidth;
753 }
754
755 return sprintf(data, "%d\n", bandwidth);
756 }
757
758 /* default attribute files for the MCI object */
mci_ue_count_show(struct device * dev,struct device_attribute * mattr,char * data)759 static ssize_t mci_ue_count_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->ue_mc);
766 }
767
mci_ce_count_show(struct device * dev,struct device_attribute * mattr,char * data)768 static ssize_t mci_ce_count_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->ce_mc);
775 }
776
mci_ce_noinfo_show(struct device * dev,struct device_attribute * mattr,char * data)777 static ssize_t mci_ce_noinfo_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, "%d\n", mci->ce_noinfo_count);
784 }
785
mci_ue_noinfo_show(struct device * dev,struct device_attribute * mattr,char * data)786 static ssize_t mci_ue_noinfo_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, "%d\n", mci->ue_noinfo_count);
793 }
794
mci_seconds_show(struct device * dev,struct device_attribute * mattr,char * data)795 static ssize_t mci_seconds_show(struct device *dev,
796 struct device_attribute *mattr,
797 char *data)
798 {
799 struct mem_ctl_info *mci = to_mci(dev);
800
801 return sprintf(data, "%ld\n", (jiffies - mci->start_time) / HZ);
802 }
803
mci_ctl_name_show(struct device * dev,struct device_attribute * mattr,char * data)804 static ssize_t mci_ctl_name_show(struct device *dev,
805 struct device_attribute *mattr,
806 char *data)
807 {
808 struct mem_ctl_info *mci = to_mci(dev);
809
810 return sprintf(data, "%s\n", mci->ctl_name);
811 }
812
mci_size_mb_show(struct device * dev,struct device_attribute * mattr,char * data)813 static ssize_t mci_size_mb_show(struct device *dev,
814 struct device_attribute *mattr,
815 char *data)
816 {
817 struct mem_ctl_info *mci = to_mci(dev);
818 int total_pages = 0, csrow_idx, j;
819
820 for (csrow_idx = 0; csrow_idx < mci->nr_csrows; csrow_idx++) {
821 struct csrow_info *csrow = mci->csrows[csrow_idx];
822
823 for (j = 0; j < csrow->nr_channels; j++) {
824 struct dimm_info *dimm = csrow->channels[j]->dimm;
825
826 total_pages += dimm->nr_pages;
827 }
828 }
829
830 return sprintf(data, "%u\n", PAGES_TO_MiB(total_pages));
831 }
832
mci_max_location_show(struct device * dev,struct device_attribute * mattr,char * data)833 static ssize_t mci_max_location_show(struct device *dev,
834 struct device_attribute *mattr,
835 char *data)
836 {
837 struct mem_ctl_info *mci = to_mci(dev);
838 int i;
839 char *p = data;
840
841 for (i = 0; i < mci->n_layers; i++) {
842 p += sprintf(p, "%s %d ",
843 edac_layer_name[mci->layers[i].type],
844 mci->layers[i].size - 1);
845 }
846
847 return p - data;
848 }
849
850 /* default Control file */
851 static DEVICE_ATTR(reset_counters, S_IWUSR, NULL, mci_reset_counters_store);
852
853 /* default Attribute files */
854 static DEVICE_ATTR(mc_name, S_IRUGO, mci_ctl_name_show, NULL);
855 static DEVICE_ATTR(size_mb, S_IRUGO, mci_size_mb_show, NULL);
856 static DEVICE_ATTR(seconds_since_reset, S_IRUGO, mci_seconds_show, NULL);
857 static DEVICE_ATTR(ue_noinfo_count, S_IRUGO, mci_ue_noinfo_show, NULL);
858 static DEVICE_ATTR(ce_noinfo_count, S_IRUGO, mci_ce_noinfo_show, NULL);
859 static DEVICE_ATTR(ue_count, S_IRUGO, mci_ue_count_show, NULL);
860 static DEVICE_ATTR(ce_count, S_IRUGO, mci_ce_count_show, NULL);
861 static DEVICE_ATTR(max_location, S_IRUGO, mci_max_location_show, NULL);
862
863 /* memory scrubber attribute file */
864 static DEVICE_ATTR(sdram_scrub_rate, 0, mci_sdram_scrub_rate_show,
865 mci_sdram_scrub_rate_store); /* umode set later in is_visible */
866
867 static struct attribute *mci_attrs[] = {
868 &dev_attr_reset_counters.attr,
869 &dev_attr_mc_name.attr,
870 &dev_attr_size_mb.attr,
871 &dev_attr_seconds_since_reset.attr,
872 &dev_attr_ue_noinfo_count.attr,
873 &dev_attr_ce_noinfo_count.attr,
874 &dev_attr_ue_count.attr,
875 &dev_attr_ce_count.attr,
876 &dev_attr_max_location.attr,
877 &dev_attr_sdram_scrub_rate.attr,
878 NULL
879 };
880
mci_attr_is_visible(struct kobject * kobj,struct attribute * attr,int idx)881 static umode_t mci_attr_is_visible(struct kobject *kobj,
882 struct attribute *attr, int idx)
883 {
884 struct device *dev = kobj_to_dev(kobj);
885 struct mem_ctl_info *mci = to_mci(dev);
886 umode_t mode = 0;
887
888 if (attr != &dev_attr_sdram_scrub_rate.attr)
889 return attr->mode;
890 if (mci->get_sdram_scrub_rate)
891 mode |= S_IRUGO;
892 if (mci->set_sdram_scrub_rate)
893 mode |= S_IWUSR;
894 return mode;
895 }
896
897 static const struct attribute_group mci_attr_grp = {
898 .attrs = mci_attrs,
899 .is_visible = mci_attr_is_visible,
900 };
901
902 static const struct attribute_group *mci_attr_groups[] = {
903 &mci_attr_grp,
904 NULL
905 };
906
mci_attr_release(struct device * dev)907 static void mci_attr_release(struct device *dev)
908 {
909 struct mem_ctl_info *mci = container_of(dev, struct mem_ctl_info, dev);
910
911 edac_dbg(1, "device %s released\n", dev_name(dev));
912 kfree(mci);
913 }
914
915 static const struct device_type mci_attr_type = {
916 .groups = mci_attr_groups,
917 .release = mci_attr_release,
918 };
919
920 /*
921 * Create a new Memory Controller kobject instance,
922 * mc<id> under the 'mc' directory
923 *
924 * Return:
925 * 0 Success
926 * !0 Failure
927 */
edac_create_sysfs_mci_device(struct mem_ctl_info * mci,const struct attribute_group ** groups)928 int edac_create_sysfs_mci_device(struct mem_ctl_info *mci,
929 const struct attribute_group **groups)
930 {
931 int i, err;
932
933 /* get the /sys/devices/system/edac subsys reference */
934 mci->dev.type = &mci_attr_type;
935 device_initialize(&mci->dev);
936
937 mci->dev.parent = mci_pdev;
938 mci->dev.groups = groups;
939 dev_set_name(&mci->dev, "mc%d", mci->mc_idx);
940 dev_set_drvdata(&mci->dev, mci);
941 pm_runtime_forbid(&mci->dev);
942
943 err = device_add(&mci->dev);
944 if (err < 0) {
945 edac_dbg(1, "failure: create device %s\n", dev_name(&mci->dev));
946 put_device(&mci->dev);
947 return err;
948 }
949
950 edac_dbg(0, "device %s created\n", dev_name(&mci->dev));
951
952 /*
953 * Create the dimm/rank devices
954 */
955 for (i = 0; i < mci->tot_dimms; i++) {
956 struct dimm_info *dimm = mci->dimms[i];
957 /* Only expose populated DIMMs */
958 if (!dimm->nr_pages)
959 continue;
960
961 err = edac_create_dimm_object(mci, dimm, i);
962 if (err)
963 goto fail_unregister_dimm;
964 }
965
966 #ifdef CONFIG_EDAC_LEGACY_SYSFS
967 err = edac_create_csrow_objects(mci);
968 if (err < 0)
969 goto fail_unregister_dimm;
970 #endif
971
972 edac_create_debugfs_nodes(mci);
973 return 0;
974
975 fail_unregister_dimm:
976 for (i--; i >= 0; i--) {
977 struct dimm_info *dimm = mci->dimms[i];
978 if (!dimm->nr_pages)
979 continue;
980
981 device_unregister(&dimm->dev);
982 }
983 device_unregister(&mci->dev);
984
985 return err;
986 }
987
988 /*
989 * remove a Memory Controller instance
990 */
edac_remove_sysfs_mci_device(struct mem_ctl_info * mci)991 void edac_remove_sysfs_mci_device(struct mem_ctl_info *mci)
992 {
993 int i;
994
995 edac_dbg(0, "\n");
996
997 #ifdef CONFIG_EDAC_DEBUG
998 edac_debugfs_remove_recursive(mci->debugfs);
999 #endif
1000 #ifdef CONFIG_EDAC_LEGACY_SYSFS
1001 edac_delete_csrow_objects(mci);
1002 #endif
1003
1004 for (i = 0; i < mci->tot_dimms; i++) {
1005 struct dimm_info *dimm = mci->dimms[i];
1006 if (dimm->nr_pages == 0)
1007 continue;
1008 edac_dbg(1, "unregistering device %s\n", dev_name(&dimm->dev));
1009 device_unregister(&dimm->dev);
1010 }
1011 }
1012
edac_unregister_sysfs(struct mem_ctl_info * mci)1013 void edac_unregister_sysfs(struct mem_ctl_info *mci)
1014 {
1015 edac_dbg(1, "unregistering device %s\n", dev_name(&mci->dev));
1016 device_unregister(&mci->dev);
1017 }
1018
mc_attr_release(struct device * dev)1019 static void mc_attr_release(struct device *dev)
1020 {
1021 /*
1022 * There's no container structure here, as this is just the mci
1023 * parent device, used to create the /sys/devices/mc sysfs node.
1024 * So, there are no attributes on it.
1025 */
1026 edac_dbg(1, "device %s released\n", dev_name(dev));
1027 kfree(dev);
1028 }
1029
1030 static const struct device_type mc_attr_type = {
1031 .release = mc_attr_release,
1032 };
1033 /*
1034 * Init/exit code for the module. Basically, creates/removes /sys/class/rc
1035 */
edac_mc_sysfs_init(void)1036 int __init edac_mc_sysfs_init(void)
1037 {
1038 int err;
1039
1040 mci_pdev = kzalloc(sizeof(*mci_pdev), GFP_KERNEL);
1041 if (!mci_pdev)
1042 return -ENOMEM;
1043
1044 mci_pdev->bus = edac_get_sysfs_subsys();
1045 mci_pdev->type = &mc_attr_type;
1046 device_initialize(mci_pdev);
1047 dev_set_name(mci_pdev, "mc");
1048
1049 err = device_add(mci_pdev);
1050 if (err < 0) {
1051 edac_dbg(1, "failure: create device %s\n", dev_name(mci_pdev));
1052 put_device(mci_pdev);
1053 return err;
1054 }
1055
1056 edac_dbg(0, "device %s created\n", dev_name(mci_pdev));
1057
1058 return 0;
1059 }
1060
edac_mc_sysfs_exit(void)1061 void edac_mc_sysfs_exit(void)
1062 {
1063 device_unregister(mci_pdev);
1064 }
1065