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 */ |
32 | int edac_mc_get_log_ue(void) |
33 | { |
34 | return edac_mc_log_ue; |
35 | } |
36 | |
37 | int edac_mc_get_log_ce(void) |
38 | { |
39 | return edac_mc_log_ce; |
40 | } |
41 | |
42 | int edac_mc_get_panic_on_ue(void) |
43 | { |
44 | return edac_mc_panic_on_ue; |
45 | } |
46 | |
47 | /* this is temporary */ |
48 | unsigned int edac_mc_get_poll_msec(void) |
49 | { |
50 | return edac_mc_poll_msec; |
51 | } |
52 | |
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(s: val, base: 0, res: &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(value: 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 */ |
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(buf: data, fmt: "%u\n" , csrow->ue_count); |
150 | } |
151 | |
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(buf: data, fmt: "%u\n" , csrow->ce_count); |
158 | } |
159 | |
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(buf: data, fmt: "%u\n" , PAGES_TO_MiB(nr_pages)); |
170 | } |
171 | |
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(buf: data, fmt: "%s\n" , edac_mem_types[csrow->channels[0]->dimm->mtype]); |
178 | } |
179 | |
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(buf: data, fmt: "%s\n" , dev_types[csrow->channels[0]->dimm->dtype]); |
186 | } |
187 | |
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(buf: data, fmt: "%s\n" , edac_caps[csrow->channels[0]->dimm->edac_mode]); |
195 | } |
196 | |
197 | /* show/store functions for DIMM Label attributes */ |
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(buf: data, size: sizeof(rank->dimm->label) + 1, fmt: "%s\n" , |
211 | rank->dimm->label); |
212 | } |
213 | |
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 | memcpy(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 */ |
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(buf: data, fmt: "%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 | DEVICE_CHANNEL(ch8_dimm_label, S_IRUGO | S_IWUSR, |
302 | channel_dimm_label_show, channel_dimm_label_store, 8); |
303 | DEVICE_CHANNEL(ch9_dimm_label, S_IRUGO | S_IWUSR, |
304 | channel_dimm_label_show, channel_dimm_label_store, 9); |
305 | DEVICE_CHANNEL(ch10_dimm_label, S_IRUGO | S_IWUSR, |
306 | channel_dimm_label_show, channel_dimm_label_store, 10); |
307 | DEVICE_CHANNEL(ch11_dimm_label, S_IRUGO | S_IWUSR, |
308 | channel_dimm_label_show, channel_dimm_label_store, 11); |
309 | |
310 | /* Total possible dynamic DIMM Label attribute file table */ |
311 | static struct attribute *dynamic_csrow_dimm_attr[] = { |
312 | &dev_attr_legacy_ch0_dimm_label.attr.attr, |
313 | &dev_attr_legacy_ch1_dimm_label.attr.attr, |
314 | &dev_attr_legacy_ch2_dimm_label.attr.attr, |
315 | &dev_attr_legacy_ch3_dimm_label.attr.attr, |
316 | &dev_attr_legacy_ch4_dimm_label.attr.attr, |
317 | &dev_attr_legacy_ch5_dimm_label.attr.attr, |
318 | &dev_attr_legacy_ch6_dimm_label.attr.attr, |
319 | &dev_attr_legacy_ch7_dimm_label.attr.attr, |
320 | &dev_attr_legacy_ch8_dimm_label.attr.attr, |
321 | &dev_attr_legacy_ch9_dimm_label.attr.attr, |
322 | &dev_attr_legacy_ch10_dimm_label.attr.attr, |
323 | &dev_attr_legacy_ch11_dimm_label.attr.attr, |
324 | NULL |
325 | }; |
326 | |
327 | /* possible dynamic channel ce_count attribute files */ |
328 | DEVICE_CHANNEL(ch0_ce_count, S_IRUGO, |
329 | channel_ce_count_show, NULL, 0); |
330 | DEVICE_CHANNEL(ch1_ce_count, S_IRUGO, |
331 | channel_ce_count_show, NULL, 1); |
332 | DEVICE_CHANNEL(ch2_ce_count, S_IRUGO, |
333 | channel_ce_count_show, NULL, 2); |
334 | DEVICE_CHANNEL(ch3_ce_count, S_IRUGO, |
335 | channel_ce_count_show, NULL, 3); |
336 | DEVICE_CHANNEL(ch4_ce_count, S_IRUGO, |
337 | channel_ce_count_show, NULL, 4); |
338 | DEVICE_CHANNEL(ch5_ce_count, S_IRUGO, |
339 | channel_ce_count_show, NULL, 5); |
340 | DEVICE_CHANNEL(ch6_ce_count, S_IRUGO, |
341 | channel_ce_count_show, NULL, 6); |
342 | DEVICE_CHANNEL(ch7_ce_count, S_IRUGO, |
343 | channel_ce_count_show, NULL, 7); |
344 | DEVICE_CHANNEL(ch8_ce_count, S_IRUGO, |
345 | channel_ce_count_show, NULL, 8); |
346 | DEVICE_CHANNEL(ch9_ce_count, S_IRUGO, |
347 | channel_ce_count_show, NULL, 9); |
348 | DEVICE_CHANNEL(ch10_ce_count, S_IRUGO, |
349 | channel_ce_count_show, NULL, 10); |
350 | DEVICE_CHANNEL(ch11_ce_count, S_IRUGO, |
351 | channel_ce_count_show, NULL, 11); |
352 | |
353 | /* Total possible dynamic ce_count attribute file table */ |
354 | static struct attribute *dynamic_csrow_ce_count_attr[] = { |
355 | &dev_attr_legacy_ch0_ce_count.attr.attr, |
356 | &dev_attr_legacy_ch1_ce_count.attr.attr, |
357 | &dev_attr_legacy_ch2_ce_count.attr.attr, |
358 | &dev_attr_legacy_ch3_ce_count.attr.attr, |
359 | &dev_attr_legacy_ch4_ce_count.attr.attr, |
360 | &dev_attr_legacy_ch5_ce_count.attr.attr, |
361 | &dev_attr_legacy_ch6_ce_count.attr.attr, |
362 | &dev_attr_legacy_ch7_ce_count.attr.attr, |
363 | &dev_attr_legacy_ch8_ce_count.attr.attr, |
364 | &dev_attr_legacy_ch9_ce_count.attr.attr, |
365 | &dev_attr_legacy_ch10_ce_count.attr.attr, |
366 | &dev_attr_legacy_ch11_ce_count.attr.attr, |
367 | NULL |
368 | }; |
369 | |
370 | static umode_t csrow_dev_is_visible(struct kobject *kobj, |
371 | struct attribute *attr, int idx) |
372 | { |
373 | struct device *dev = kobj_to_dev(kobj); |
374 | struct csrow_info *csrow = container_of(dev, struct csrow_info, dev); |
375 | |
376 | if (idx >= csrow->nr_channels) |
377 | return 0; |
378 | |
379 | if (idx >= ARRAY_SIZE(dynamic_csrow_ce_count_attr) - 1) { |
380 | WARN_ONCE(1, "idx: %d\n" , idx); |
381 | return 0; |
382 | } |
383 | |
384 | /* Only expose populated DIMMs */ |
385 | if (!csrow->channels[idx]->dimm->nr_pages) |
386 | return 0; |
387 | |
388 | return attr->mode; |
389 | } |
390 | |
391 | |
392 | static const struct attribute_group csrow_dev_dimm_group = { |
393 | .attrs = dynamic_csrow_dimm_attr, |
394 | .is_visible = csrow_dev_is_visible, |
395 | }; |
396 | |
397 | static const struct attribute_group csrow_dev_ce_count_group = { |
398 | .attrs = dynamic_csrow_ce_count_attr, |
399 | .is_visible = csrow_dev_is_visible, |
400 | }; |
401 | |
402 | static const struct attribute_group *csrow_dev_groups[] = { |
403 | &csrow_dev_dimm_group, |
404 | &csrow_dev_ce_count_group, |
405 | NULL |
406 | }; |
407 | |
408 | static void csrow_release(struct device *dev) |
409 | { |
410 | /* |
411 | * Nothing to do, just unregister sysfs here. The mci |
412 | * device owns the data and will also release it. |
413 | */ |
414 | } |
415 | |
416 | static inline int nr_pages_per_csrow(struct csrow_info *csrow) |
417 | { |
418 | int chan, nr_pages = 0; |
419 | |
420 | for (chan = 0; chan < csrow->nr_channels; chan++) |
421 | nr_pages += csrow->channels[chan]->dimm->nr_pages; |
422 | |
423 | return nr_pages; |
424 | } |
425 | |
426 | /* Create a CSROW object under specifed edac_mc_device */ |
427 | static int edac_create_csrow_object(struct mem_ctl_info *mci, |
428 | struct csrow_info *csrow, int index) |
429 | { |
430 | int err; |
431 | |
432 | csrow->dev.type = &csrow_attr_type; |
433 | csrow->dev.groups = csrow_dev_groups; |
434 | csrow->dev.release = csrow_release; |
435 | device_initialize(dev: &csrow->dev); |
436 | csrow->dev.parent = &mci->dev; |
437 | csrow->mci = mci; |
438 | dev_set_name(dev: &csrow->dev, name: "csrow%d" , index); |
439 | dev_set_drvdata(dev: &csrow->dev, data: csrow); |
440 | |
441 | err = device_add(dev: &csrow->dev); |
442 | if (err) { |
443 | edac_dbg(1, "failure: create device %s\n" , dev_name(&csrow->dev)); |
444 | put_device(dev: &csrow->dev); |
445 | return err; |
446 | } |
447 | |
448 | edac_dbg(0, "device %s created\n" , dev_name(&csrow->dev)); |
449 | |
450 | return 0; |
451 | } |
452 | |
453 | /* Create a CSROW object under specifed edac_mc_device */ |
454 | static int edac_create_csrow_objects(struct mem_ctl_info *mci) |
455 | { |
456 | int err, i; |
457 | struct csrow_info *csrow; |
458 | |
459 | for (i = 0; i < mci->nr_csrows; i++) { |
460 | csrow = mci->csrows[i]; |
461 | if (!nr_pages_per_csrow(csrow)) |
462 | continue; |
463 | err = edac_create_csrow_object(mci, csrow: mci->csrows[i], index: i); |
464 | if (err < 0) |
465 | goto error; |
466 | } |
467 | return 0; |
468 | |
469 | error: |
470 | for (--i; i >= 0; i--) { |
471 | if (device_is_registered(dev: &mci->csrows[i]->dev)) |
472 | device_unregister(dev: &mci->csrows[i]->dev); |
473 | } |
474 | |
475 | return err; |
476 | } |
477 | |
478 | static void edac_delete_csrow_objects(struct mem_ctl_info *mci) |
479 | { |
480 | int i; |
481 | |
482 | for (i = 0; i < mci->nr_csrows; i++) { |
483 | if (device_is_registered(dev: &mci->csrows[i]->dev)) |
484 | device_unregister(dev: &mci->csrows[i]->dev); |
485 | } |
486 | } |
487 | |
488 | #endif |
489 | |
490 | /* |
491 | * Per-dimm (or per-rank) devices |
492 | */ |
493 | |
494 | #define to_dimm(k) container_of(k, struct dimm_info, dev) |
495 | |
496 | /* show/store functions for DIMM Label attributes */ |
497 | static ssize_t dimmdev_location_show(struct device *dev, |
498 | struct device_attribute *mattr, char *data) |
499 | { |
500 | struct dimm_info *dimm = to_dimm(dev); |
501 | ssize_t count; |
502 | |
503 | count = edac_dimm_info_location(dimm, buf: data, PAGE_SIZE); |
504 | count += scnprintf(buf: data + count, PAGE_SIZE - count, fmt: "\n" ); |
505 | |
506 | return count; |
507 | } |
508 | |
509 | static ssize_t dimmdev_label_show(struct device *dev, |
510 | struct device_attribute *mattr, char *data) |
511 | { |
512 | struct dimm_info *dimm = to_dimm(dev); |
513 | |
514 | /* if field has not been initialized, there is nothing to send */ |
515 | if (!dimm->label[0]) |
516 | return 0; |
517 | |
518 | return snprintf(buf: data, size: sizeof(dimm->label) + 1, fmt: "%s\n" , dimm->label); |
519 | } |
520 | |
521 | static ssize_t dimmdev_label_store(struct device *dev, |
522 | struct device_attribute *mattr, |
523 | const char *data, |
524 | size_t count) |
525 | { |
526 | struct dimm_info *dimm = to_dimm(dev); |
527 | size_t copy_count = count; |
528 | |
529 | if (count == 0) |
530 | return -EINVAL; |
531 | |
532 | if (data[count - 1] == '\0' || data[count - 1] == '\n') |
533 | copy_count -= 1; |
534 | |
535 | if (copy_count == 0 || copy_count >= sizeof(dimm->label)) |
536 | return -EINVAL; |
537 | |
538 | memcpy(dimm->label, data, copy_count); |
539 | dimm->label[copy_count] = '\0'; |
540 | |
541 | return count; |
542 | } |
543 | |
544 | static ssize_t dimmdev_size_show(struct device *dev, |
545 | struct device_attribute *mattr, char *data) |
546 | { |
547 | struct dimm_info *dimm = to_dimm(dev); |
548 | |
549 | return sprintf(buf: data, fmt: "%u\n" , PAGES_TO_MiB(dimm->nr_pages)); |
550 | } |
551 | |
552 | static ssize_t dimmdev_mem_type_show(struct device *dev, |
553 | struct device_attribute *mattr, char *data) |
554 | { |
555 | struct dimm_info *dimm = to_dimm(dev); |
556 | |
557 | return sprintf(buf: data, fmt: "%s\n" , edac_mem_types[dimm->mtype]); |
558 | } |
559 | |
560 | static ssize_t dimmdev_dev_type_show(struct device *dev, |
561 | struct device_attribute *mattr, char *data) |
562 | { |
563 | struct dimm_info *dimm = to_dimm(dev); |
564 | |
565 | return sprintf(buf: data, fmt: "%s\n" , dev_types[dimm->dtype]); |
566 | } |
567 | |
568 | static ssize_t dimmdev_edac_mode_show(struct device *dev, |
569 | struct device_attribute *mattr, |
570 | char *data) |
571 | { |
572 | struct dimm_info *dimm = to_dimm(dev); |
573 | |
574 | return sprintf(buf: data, fmt: "%s\n" , edac_caps[dimm->edac_mode]); |
575 | } |
576 | |
577 | static ssize_t dimmdev_ce_count_show(struct device *dev, |
578 | struct device_attribute *mattr, |
579 | char *data) |
580 | { |
581 | struct dimm_info *dimm = to_dimm(dev); |
582 | |
583 | return sprintf(buf: data, fmt: "%u\n" , dimm->ce_count); |
584 | } |
585 | |
586 | static ssize_t dimmdev_ue_count_show(struct device *dev, |
587 | struct device_attribute *mattr, |
588 | char *data) |
589 | { |
590 | struct dimm_info *dimm = to_dimm(dev); |
591 | |
592 | return sprintf(buf: data, fmt: "%u\n" , dimm->ue_count); |
593 | } |
594 | |
595 | /* dimm/rank attribute files */ |
596 | static DEVICE_ATTR(dimm_label, S_IRUGO | S_IWUSR, |
597 | dimmdev_label_show, dimmdev_label_store); |
598 | static DEVICE_ATTR(dimm_location, S_IRUGO, dimmdev_location_show, NULL); |
599 | static DEVICE_ATTR(size, S_IRUGO, dimmdev_size_show, NULL); |
600 | static DEVICE_ATTR(dimm_mem_type, S_IRUGO, dimmdev_mem_type_show, NULL); |
601 | static DEVICE_ATTR(dimm_dev_type, S_IRUGO, dimmdev_dev_type_show, NULL); |
602 | static DEVICE_ATTR(dimm_edac_mode, S_IRUGO, dimmdev_edac_mode_show, NULL); |
603 | static DEVICE_ATTR(dimm_ce_count, S_IRUGO, dimmdev_ce_count_show, NULL); |
604 | static DEVICE_ATTR(dimm_ue_count, S_IRUGO, dimmdev_ue_count_show, NULL); |
605 | |
606 | /* attributes of the dimm<id>/rank<id> object */ |
607 | static struct attribute *dimm_attrs[] = { |
608 | &dev_attr_dimm_label.attr, |
609 | &dev_attr_dimm_location.attr, |
610 | &dev_attr_size.attr, |
611 | &dev_attr_dimm_mem_type.attr, |
612 | &dev_attr_dimm_dev_type.attr, |
613 | &dev_attr_dimm_edac_mode.attr, |
614 | &dev_attr_dimm_ce_count.attr, |
615 | &dev_attr_dimm_ue_count.attr, |
616 | NULL, |
617 | }; |
618 | |
619 | static const struct attribute_group dimm_attr_grp = { |
620 | .attrs = dimm_attrs, |
621 | }; |
622 | |
623 | static const struct attribute_group *dimm_attr_groups[] = { |
624 | &dimm_attr_grp, |
625 | NULL |
626 | }; |
627 | |
628 | static const struct device_type dimm_attr_type = { |
629 | .groups = dimm_attr_groups, |
630 | }; |
631 | |
632 | static void dimm_release(struct device *dev) |
633 | { |
634 | /* |
635 | * Nothing to do, just unregister sysfs here. The mci |
636 | * device owns the data and will also release it. |
637 | */ |
638 | } |
639 | |
640 | /* Create a DIMM object under specifed memory controller device */ |
641 | static int edac_create_dimm_object(struct mem_ctl_info *mci, |
642 | struct dimm_info *dimm) |
643 | { |
644 | int err; |
645 | dimm->mci = mci; |
646 | |
647 | dimm->dev.type = &dimm_attr_type; |
648 | dimm->dev.release = dimm_release; |
649 | device_initialize(dev: &dimm->dev); |
650 | |
651 | dimm->dev.parent = &mci->dev; |
652 | if (mci->csbased) |
653 | dev_set_name(dev: &dimm->dev, name: "rank%d" , dimm->idx); |
654 | else |
655 | dev_set_name(dev: &dimm->dev, name: "dimm%d" , dimm->idx); |
656 | dev_set_drvdata(dev: &dimm->dev, data: dimm); |
657 | pm_runtime_forbid(dev: &mci->dev); |
658 | |
659 | err = device_add(dev: &dimm->dev); |
660 | if (err) { |
661 | edac_dbg(1, "failure: create device %s\n" , dev_name(&dimm->dev)); |
662 | put_device(dev: &dimm->dev); |
663 | return err; |
664 | } |
665 | |
666 | if (IS_ENABLED(CONFIG_EDAC_DEBUG)) { |
667 | char location[80]; |
668 | |
669 | edac_dimm_info_location(dimm, buf: location, len: sizeof(location)); |
670 | edac_dbg(0, "device %s created at location %s\n" , |
671 | dev_name(&dimm->dev), location); |
672 | } |
673 | |
674 | return 0; |
675 | } |
676 | |
677 | /* |
678 | * Memory controller device |
679 | */ |
680 | |
681 | #define to_mci(k) container_of(k, struct mem_ctl_info, dev) |
682 | |
683 | static ssize_t mci_reset_counters_store(struct device *dev, |
684 | struct device_attribute *mattr, |
685 | const char *data, size_t count) |
686 | { |
687 | struct mem_ctl_info *mci = to_mci(dev); |
688 | struct dimm_info *dimm; |
689 | int row, chan; |
690 | |
691 | mci->ue_mc = 0; |
692 | mci->ce_mc = 0; |
693 | mci->ue_noinfo_count = 0; |
694 | mci->ce_noinfo_count = 0; |
695 | |
696 | for (row = 0; row < mci->nr_csrows; row++) { |
697 | struct csrow_info *ri = mci->csrows[row]; |
698 | |
699 | ri->ue_count = 0; |
700 | ri->ce_count = 0; |
701 | |
702 | for (chan = 0; chan < ri->nr_channels; chan++) |
703 | ri->channels[chan]->ce_count = 0; |
704 | } |
705 | |
706 | mci_for_each_dimm(mci, dimm) { |
707 | dimm->ue_count = 0; |
708 | dimm->ce_count = 0; |
709 | } |
710 | |
711 | mci->start_time = jiffies; |
712 | return count; |
713 | } |
714 | |
715 | /* Memory scrubbing interface: |
716 | * |
717 | * A MC driver can limit the scrubbing bandwidth based on the CPU type. |
718 | * Therefore, ->set_sdram_scrub_rate should be made to return the actual |
719 | * bandwidth that is accepted or 0 when scrubbing is to be disabled. |
720 | * |
721 | * Negative value still means that an error has occurred while setting |
722 | * the scrub rate. |
723 | */ |
724 | static ssize_t mci_sdram_scrub_rate_store(struct device *dev, |
725 | struct device_attribute *mattr, |
726 | const char *data, size_t count) |
727 | { |
728 | struct mem_ctl_info *mci = to_mci(dev); |
729 | unsigned long bandwidth = 0; |
730 | int new_bw = 0; |
731 | |
732 | if (kstrtoul(s: data, base: 10, res: &bandwidth) < 0) |
733 | return -EINVAL; |
734 | |
735 | new_bw = mci->set_sdram_scrub_rate(mci, bandwidth); |
736 | if (new_bw < 0) { |
737 | edac_printk(KERN_WARNING, EDAC_MC, |
738 | "Error setting scrub rate to: %lu\n" , bandwidth); |
739 | return -EINVAL; |
740 | } |
741 | |
742 | return count; |
743 | } |
744 | |
745 | /* |
746 | * ->get_sdram_scrub_rate() return value semantics same as above. |
747 | */ |
748 | static ssize_t mci_sdram_scrub_rate_show(struct device *dev, |
749 | struct device_attribute *mattr, |
750 | char *data) |
751 | { |
752 | struct mem_ctl_info *mci = to_mci(dev); |
753 | int bandwidth = 0; |
754 | |
755 | bandwidth = mci->get_sdram_scrub_rate(mci); |
756 | if (bandwidth < 0) { |
757 | edac_printk(KERN_DEBUG, EDAC_MC, "Error reading scrub rate\n" ); |
758 | return bandwidth; |
759 | } |
760 | |
761 | return sprintf(buf: data, fmt: "%d\n" , bandwidth); |
762 | } |
763 | |
764 | /* default attribute files for the MCI object */ |
765 | static ssize_t mci_ue_count_show(struct device *dev, |
766 | struct device_attribute *mattr, |
767 | char *data) |
768 | { |
769 | struct mem_ctl_info *mci = to_mci(dev); |
770 | |
771 | return sprintf(buf: data, fmt: "%u\n" , mci->ue_mc); |
772 | } |
773 | |
774 | static ssize_t mci_ce_count_show(struct device *dev, |
775 | struct device_attribute *mattr, |
776 | char *data) |
777 | { |
778 | struct mem_ctl_info *mci = to_mci(dev); |
779 | |
780 | return sprintf(buf: data, fmt: "%u\n" , mci->ce_mc); |
781 | } |
782 | |
783 | static ssize_t mci_ce_noinfo_show(struct device *dev, |
784 | struct device_attribute *mattr, |
785 | char *data) |
786 | { |
787 | struct mem_ctl_info *mci = to_mci(dev); |
788 | |
789 | return sprintf(buf: data, fmt: "%u\n" , mci->ce_noinfo_count); |
790 | } |
791 | |
792 | static ssize_t mci_ue_noinfo_show(struct device *dev, |
793 | struct device_attribute *mattr, |
794 | char *data) |
795 | { |
796 | struct mem_ctl_info *mci = to_mci(dev); |
797 | |
798 | return sprintf(buf: data, fmt: "%u\n" , mci->ue_noinfo_count); |
799 | } |
800 | |
801 | static ssize_t mci_seconds_show(struct device *dev, |
802 | struct device_attribute *mattr, |
803 | char *data) |
804 | { |
805 | struct mem_ctl_info *mci = to_mci(dev); |
806 | |
807 | return sprintf(buf: data, fmt: "%ld\n" , (jiffies - mci->start_time) / HZ); |
808 | } |
809 | |
810 | static ssize_t mci_ctl_name_show(struct device *dev, |
811 | struct device_attribute *mattr, |
812 | char *data) |
813 | { |
814 | struct mem_ctl_info *mci = to_mci(dev); |
815 | |
816 | return sprintf(buf: data, fmt: "%s\n" , mci->ctl_name); |
817 | } |
818 | |
819 | static ssize_t mci_size_mb_show(struct device *dev, |
820 | struct device_attribute *mattr, |
821 | char *data) |
822 | { |
823 | struct mem_ctl_info *mci = to_mci(dev); |
824 | int total_pages = 0, csrow_idx, j; |
825 | |
826 | for (csrow_idx = 0; csrow_idx < mci->nr_csrows; csrow_idx++) { |
827 | struct csrow_info *csrow = mci->csrows[csrow_idx]; |
828 | |
829 | for (j = 0; j < csrow->nr_channels; j++) { |
830 | struct dimm_info *dimm = csrow->channels[j]->dimm; |
831 | |
832 | total_pages += dimm->nr_pages; |
833 | } |
834 | } |
835 | |
836 | return sprintf(buf: data, fmt: "%u\n" , PAGES_TO_MiB(total_pages)); |
837 | } |
838 | |
839 | static ssize_t mci_max_location_show(struct device *dev, |
840 | struct device_attribute *mattr, |
841 | char *data) |
842 | { |
843 | struct mem_ctl_info *mci = to_mci(dev); |
844 | int len = PAGE_SIZE; |
845 | char *p = data; |
846 | int i, n; |
847 | |
848 | for (i = 0; i < mci->n_layers; i++) { |
849 | n = scnprintf(buf: p, size: len, fmt: "%s %d " , |
850 | edac_layer_name[mci->layers[i].type], |
851 | mci->layers[i].size - 1); |
852 | len -= n; |
853 | if (len <= 0) |
854 | goto out; |
855 | |
856 | p += n; |
857 | } |
858 | |
859 | p += scnprintf(buf: p, size: len, fmt: "\n" ); |
860 | out: |
861 | return p - data; |
862 | } |
863 | |
864 | /* default Control file */ |
865 | static DEVICE_ATTR(reset_counters, S_IWUSR, NULL, mci_reset_counters_store); |
866 | |
867 | /* default Attribute files */ |
868 | static DEVICE_ATTR(mc_name, S_IRUGO, mci_ctl_name_show, NULL); |
869 | static DEVICE_ATTR(size_mb, S_IRUGO, mci_size_mb_show, NULL); |
870 | static DEVICE_ATTR(seconds_since_reset, S_IRUGO, mci_seconds_show, NULL); |
871 | static DEVICE_ATTR(ue_noinfo_count, S_IRUGO, mci_ue_noinfo_show, NULL); |
872 | static DEVICE_ATTR(ce_noinfo_count, S_IRUGO, mci_ce_noinfo_show, NULL); |
873 | static DEVICE_ATTR(ue_count, S_IRUGO, mci_ue_count_show, NULL); |
874 | static DEVICE_ATTR(ce_count, S_IRUGO, mci_ce_count_show, NULL); |
875 | static DEVICE_ATTR(max_location, S_IRUGO, mci_max_location_show, NULL); |
876 | |
877 | /* memory scrubber attribute file */ |
878 | static DEVICE_ATTR(sdram_scrub_rate, 0, mci_sdram_scrub_rate_show, |
879 | mci_sdram_scrub_rate_store); /* umode set later in is_visible */ |
880 | |
881 | static struct attribute *mci_attrs[] = { |
882 | &dev_attr_reset_counters.attr, |
883 | &dev_attr_mc_name.attr, |
884 | &dev_attr_size_mb.attr, |
885 | &dev_attr_seconds_since_reset.attr, |
886 | &dev_attr_ue_noinfo_count.attr, |
887 | &dev_attr_ce_noinfo_count.attr, |
888 | &dev_attr_ue_count.attr, |
889 | &dev_attr_ce_count.attr, |
890 | &dev_attr_max_location.attr, |
891 | &dev_attr_sdram_scrub_rate.attr, |
892 | NULL |
893 | }; |
894 | |
895 | static umode_t mci_attr_is_visible(struct kobject *kobj, |
896 | struct attribute *attr, int idx) |
897 | { |
898 | struct device *dev = kobj_to_dev(kobj); |
899 | struct mem_ctl_info *mci = to_mci(dev); |
900 | umode_t mode = 0; |
901 | |
902 | if (attr != &dev_attr_sdram_scrub_rate.attr) |
903 | return attr->mode; |
904 | if (mci->get_sdram_scrub_rate) |
905 | mode |= S_IRUGO; |
906 | if (mci->set_sdram_scrub_rate) |
907 | mode |= S_IWUSR; |
908 | return mode; |
909 | } |
910 | |
911 | static const struct attribute_group mci_attr_grp = { |
912 | .attrs = mci_attrs, |
913 | .is_visible = mci_attr_is_visible, |
914 | }; |
915 | |
916 | static const struct attribute_group *mci_attr_groups[] = { |
917 | &mci_attr_grp, |
918 | NULL |
919 | }; |
920 | |
921 | static const struct device_type mci_attr_type = { |
922 | .groups = mci_attr_groups, |
923 | }; |
924 | |
925 | /* |
926 | * Create a new Memory Controller kobject instance, |
927 | * mc<id> under the 'mc' directory |
928 | * |
929 | * Return: |
930 | * 0 Success |
931 | * !0 Failure |
932 | */ |
933 | int edac_create_sysfs_mci_device(struct mem_ctl_info *mci, |
934 | const struct attribute_group **groups) |
935 | { |
936 | struct dimm_info *dimm; |
937 | int err; |
938 | |
939 | /* get the /sys/devices/system/edac subsys reference */ |
940 | mci->dev.type = &mci_attr_type; |
941 | mci->dev.parent = mci_pdev; |
942 | mci->dev.groups = groups; |
943 | dev_set_name(dev: &mci->dev, name: "mc%d" , mci->mc_idx); |
944 | dev_set_drvdata(dev: &mci->dev, data: mci); |
945 | pm_runtime_forbid(dev: &mci->dev); |
946 | |
947 | err = device_add(dev: &mci->dev); |
948 | if (err < 0) { |
949 | edac_dbg(1, "failure: create device %s\n" , dev_name(&mci->dev)); |
950 | /* no put_device() here, free mci with _edac_mc_free() */ |
951 | return err; |
952 | } |
953 | |
954 | edac_dbg(0, "device %s created\n" , dev_name(&mci->dev)); |
955 | |
956 | /* |
957 | * Create the dimm/rank devices |
958 | */ |
959 | mci_for_each_dimm(mci, dimm) { |
960 | /* Only expose populated DIMMs */ |
961 | if (!dimm->nr_pages) |
962 | continue; |
963 | |
964 | err = edac_create_dimm_object(mci, dimm); |
965 | if (err) |
966 | goto fail; |
967 | } |
968 | |
969 | #ifdef CONFIG_EDAC_LEGACY_SYSFS |
970 | err = edac_create_csrow_objects(mci); |
971 | if (err < 0) |
972 | goto fail; |
973 | #endif |
974 | |
975 | edac_create_debugfs_nodes(mci); |
976 | return 0; |
977 | |
978 | fail: |
979 | edac_remove_sysfs_mci_device(mci); |
980 | |
981 | return err; |
982 | } |
983 | |
984 | /* |
985 | * remove a Memory Controller instance |
986 | */ |
987 | void edac_remove_sysfs_mci_device(struct mem_ctl_info *mci) |
988 | { |
989 | struct dimm_info *dimm; |
990 | |
991 | if (!device_is_registered(dev: &mci->dev)) |
992 | return; |
993 | |
994 | edac_dbg(0, "\n" ); |
995 | |
996 | #ifdef CONFIG_EDAC_DEBUG |
997 | edac_debugfs_remove_recursive(dentry: mci->debugfs); |
998 | #endif |
999 | #ifdef CONFIG_EDAC_LEGACY_SYSFS |
1000 | edac_delete_csrow_objects(mci); |
1001 | #endif |
1002 | |
1003 | mci_for_each_dimm(mci, dimm) { |
1004 | if (!device_is_registered(dev: &dimm->dev)) |
1005 | continue; |
1006 | edac_dbg(1, "unregistering device %s\n" , dev_name(&dimm->dev)); |
1007 | device_unregister(dev: &dimm->dev); |
1008 | } |
1009 | |
1010 | /* only remove the device, but keep mci */ |
1011 | device_del(dev: &mci->dev); |
1012 | } |
1013 | |
1014 | static void mc_attr_release(struct device *dev) |
1015 | { |
1016 | /* |
1017 | * There's no container structure here, as this is just the mci |
1018 | * parent device, used to create the /sys/devices/mc sysfs node. |
1019 | * So, there are no attributes on it. |
1020 | */ |
1021 | edac_dbg(1, "device %s released\n" , dev_name(dev)); |
1022 | kfree(objp: dev); |
1023 | } |
1024 | |
1025 | /* |
1026 | * Init/exit code for the module. Basically, creates/removes /sys/class/rc |
1027 | */ |
1028 | int __init edac_mc_sysfs_init(void) |
1029 | { |
1030 | int err; |
1031 | |
1032 | mci_pdev = kzalloc(size: sizeof(*mci_pdev), GFP_KERNEL); |
1033 | if (!mci_pdev) |
1034 | return -ENOMEM; |
1035 | |
1036 | mci_pdev->bus = edac_get_sysfs_subsys(); |
1037 | mci_pdev->release = mc_attr_release; |
1038 | mci_pdev->init_name = "mc" ; |
1039 | |
1040 | err = device_register(dev: mci_pdev); |
1041 | if (err < 0) { |
1042 | edac_dbg(1, "failure: create device %s\n" , dev_name(mci_pdev)); |
1043 | put_device(dev: mci_pdev); |
1044 | return err; |
1045 | } |
1046 | |
1047 | edac_dbg(0, "device %s created\n" , dev_name(mci_pdev)); |
1048 | |
1049 | return 0; |
1050 | } |
1051 | |
1052 | void edac_mc_sysfs_exit(void) |
1053 | { |
1054 | device_unregister(dev: mci_pdev); |
1055 | } |
1056 | |