EDAC, MCE: Shorten error report formatting
[linux-2.6.git] / drivers / edac / edac_mc_sysfs.c
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  */
11
12 #include <linux/ctype.h>
13 #include <linux/slab.h>
14 #include <linux/edac.h>
15 #include <linux/bug.h>
16
17 #include "edac_core.h"
18 #include "edac_module.h"
19
20
21 /* MC EDAC Controls, setable by module parameter, and sysfs */
22 static int edac_mc_log_ue = 1;
23 static int edac_mc_log_ce = 1;
24 static int edac_mc_panic_on_ue;
25 static int edac_mc_poll_msec = 1000;
26
27 /* Getter functions for above */
28 int edac_mc_get_log_ue(void)
29 {
30         return edac_mc_log_ue;
31 }
32
33 int edac_mc_get_log_ce(void)
34 {
35         return edac_mc_log_ce;
36 }
37
38 int edac_mc_get_panic_on_ue(void)
39 {
40         return edac_mc_panic_on_ue;
41 }
42
43 /* this is temporary */
44 int edac_mc_get_poll_msec(void)
45 {
46         return edac_mc_poll_msec;
47 }
48
49 static int edac_set_poll_msec(const char *val, struct kernel_param *kp)
50 {
51         long l;
52         int ret;
53
54         if (!val)
55                 return -EINVAL;
56
57         ret = strict_strtol(val, 0, &l);
58         if (ret == -EINVAL || ((int)l != l))
59                 return -EINVAL;
60         *((int *)kp->arg) = l;
61
62         /* notify edac_mc engine to reset the poll period */
63         edac_mc_reset_delay_period(l);
64
65         return 0;
66 }
67
68 /* Parameter declarations for above */
69 module_param(edac_mc_panic_on_ue, int, 0644);
70 MODULE_PARM_DESC(edac_mc_panic_on_ue, "Panic on uncorrected error: 0=off 1=on");
71 module_param(edac_mc_log_ue, int, 0644);
72 MODULE_PARM_DESC(edac_mc_log_ue,
73                  "Log uncorrectable error to console: 0=off 1=on");
74 module_param(edac_mc_log_ce, int, 0644);
75 MODULE_PARM_DESC(edac_mc_log_ce,
76                  "Log correctable error to console: 0=off 1=on");
77 module_param_call(edac_mc_poll_msec, edac_set_poll_msec, param_get_int,
78                   &edac_mc_poll_msec, 0644);
79 MODULE_PARM_DESC(edac_mc_poll_msec, "Polling period in milliseconds");
80
81 /*
82  * various constants for Memory Controllers
83  */
84 static const char *mem_types[] = {
85         [MEM_EMPTY] = "Empty",
86         [MEM_RESERVED] = "Reserved",
87         [MEM_UNKNOWN] = "Unknown",
88         [MEM_FPM] = "FPM",
89         [MEM_EDO] = "EDO",
90         [MEM_BEDO] = "BEDO",
91         [MEM_SDR] = "Unbuffered-SDR",
92         [MEM_RDR] = "Registered-SDR",
93         [MEM_DDR] = "Unbuffered-DDR",
94         [MEM_RDDR] = "Registered-DDR",
95         [MEM_RMBS] = "RMBS",
96         [MEM_DDR2] = "Unbuffered-DDR2",
97         [MEM_FB_DDR2] = "FullyBuffered-DDR2",
98         [MEM_RDDR2] = "Registered-DDR2",
99         [MEM_XDR] = "XDR",
100         [MEM_DDR3] = "Unbuffered-DDR3",
101         [MEM_RDDR3] = "Registered-DDR3"
102 };
103
104 static const char *dev_types[] = {
105         [DEV_UNKNOWN] = "Unknown",
106         [DEV_X1] = "x1",
107         [DEV_X2] = "x2",
108         [DEV_X4] = "x4",
109         [DEV_X8] = "x8",
110         [DEV_X16] = "x16",
111         [DEV_X32] = "x32",
112         [DEV_X64] = "x64"
113 };
114
115 static const char *edac_caps[] = {
116         [EDAC_UNKNOWN] = "Unknown",
117         [EDAC_NONE] = "None",
118         [EDAC_RESERVED] = "Reserved",
119         [EDAC_PARITY] = "PARITY",
120         [EDAC_EC] = "EC",
121         [EDAC_SECDED] = "SECDED",
122         [EDAC_S2ECD2ED] = "S2ECD2ED",
123         [EDAC_S4ECD4ED] = "S4ECD4ED",
124         [EDAC_S8ECD8ED] = "S8ECD8ED",
125         [EDAC_S16ECD16ED] = "S16ECD16ED"
126 };
127
128 /* EDAC sysfs CSROW data structures and methods
129  */
130
131 /* Set of more default csrow<id> attribute show/store functions */
132 static ssize_t csrow_ue_count_show(struct csrow_info *csrow, char *data,
133                                 int private)
134 {
135         return sprintf(data, "%u\n", csrow->ue_count);
136 }
137
138 static ssize_t csrow_ce_count_show(struct csrow_info *csrow, char *data,
139                                 int private)
140 {
141         return sprintf(data, "%u\n", csrow->ce_count);
142 }
143
144 static ssize_t csrow_size_show(struct csrow_info *csrow, char *data,
145                                 int private)
146 {
147         return sprintf(data, "%u\n", PAGES_TO_MiB(csrow->nr_pages));
148 }
149
150 static ssize_t csrow_mem_type_show(struct csrow_info *csrow, char *data,
151                                 int private)
152 {
153         return sprintf(data, "%s\n", mem_types[csrow->mtype]);
154 }
155
156 static ssize_t csrow_dev_type_show(struct csrow_info *csrow, char *data,
157                                 int private)
158 {
159         return sprintf(data, "%s\n", dev_types[csrow->dtype]);
160 }
161
162 static ssize_t csrow_edac_mode_show(struct csrow_info *csrow, char *data,
163                                 int private)
164 {
165         return sprintf(data, "%s\n", edac_caps[csrow->edac_mode]);
166 }
167
168 /* show/store functions for DIMM Label attributes */
169 static ssize_t channel_dimm_label_show(struct csrow_info *csrow,
170                                 char *data, int channel)
171 {
172         /* if field has not been initialized, there is nothing to send */
173         if (!csrow->channels[channel].label[0])
174                 return 0;
175
176         return snprintf(data, EDAC_MC_LABEL_LEN, "%s\n",
177                         csrow->channels[channel].label);
178 }
179
180 static ssize_t channel_dimm_label_store(struct csrow_info *csrow,
181                                         const char *data,
182                                         size_t count, int channel)
183 {
184         ssize_t max_size = 0;
185
186         max_size = min((ssize_t) count, (ssize_t) EDAC_MC_LABEL_LEN - 1);
187         strncpy(csrow->channels[channel].label, data, max_size);
188         csrow->channels[channel].label[max_size] = '\0';
189
190         return max_size;
191 }
192
193 /* show function for dynamic chX_ce_count attribute */
194 static ssize_t channel_ce_count_show(struct csrow_info *csrow,
195                                 char *data, int channel)
196 {
197         return sprintf(data, "%u\n", csrow->channels[channel].ce_count);
198 }
199
200 /* csrow specific attribute structure */
201 struct csrowdev_attribute {
202         struct attribute attr;
203          ssize_t(*show) (struct csrow_info *, char *, int);
204          ssize_t(*store) (struct csrow_info *, const char *, size_t, int);
205         int private;
206 };
207
208 #define to_csrow(k) container_of(k, struct csrow_info, kobj)
209 #define to_csrowdev_attr(a) container_of(a, struct csrowdev_attribute, attr)
210
211 /* Set of show/store higher level functions for default csrow attributes */
212 static ssize_t csrowdev_show(struct kobject *kobj,
213                         struct attribute *attr, char *buffer)
214 {
215         struct csrow_info *csrow = to_csrow(kobj);
216         struct csrowdev_attribute *csrowdev_attr = to_csrowdev_attr(attr);
217
218         if (csrowdev_attr->show)
219                 return csrowdev_attr->show(csrow,
220                                         buffer, csrowdev_attr->private);
221         return -EIO;
222 }
223
224 static ssize_t csrowdev_store(struct kobject *kobj, struct attribute *attr,
225                         const char *buffer, size_t count)
226 {
227         struct csrow_info *csrow = to_csrow(kobj);
228         struct csrowdev_attribute *csrowdev_attr = to_csrowdev_attr(attr);
229
230         if (csrowdev_attr->store)
231                 return csrowdev_attr->store(csrow,
232                                         buffer,
233                                         count, csrowdev_attr->private);
234         return -EIO;
235 }
236
237 static const struct sysfs_ops csrowfs_ops = {
238         .show = csrowdev_show,
239         .store = csrowdev_store
240 };
241
242 #define CSROWDEV_ATTR(_name,_mode,_show,_store,_private)        \
243 static struct csrowdev_attribute attr_##_name = {                       \
244         .attr = {.name = __stringify(_name), .mode = _mode },   \
245         .show   = _show,                                        \
246         .store  = _store,                                       \
247         .private = _private,                                    \
248 };
249
250 /* default cwrow<id>/attribute files */
251 CSROWDEV_ATTR(size_mb, S_IRUGO, csrow_size_show, NULL, 0);
252 CSROWDEV_ATTR(dev_type, S_IRUGO, csrow_dev_type_show, NULL, 0);
253 CSROWDEV_ATTR(mem_type, S_IRUGO, csrow_mem_type_show, NULL, 0);
254 CSROWDEV_ATTR(edac_mode, S_IRUGO, csrow_edac_mode_show, NULL, 0);
255 CSROWDEV_ATTR(ue_count, S_IRUGO, csrow_ue_count_show, NULL, 0);
256 CSROWDEV_ATTR(ce_count, S_IRUGO, csrow_ce_count_show, NULL, 0);
257
258 /* default attributes of the CSROW<id> object */
259 static struct csrowdev_attribute *default_csrow_attr[] = {
260         &attr_dev_type,
261         &attr_mem_type,
262         &attr_edac_mode,
263         &attr_size_mb,
264         &attr_ue_count,
265         &attr_ce_count,
266         NULL,
267 };
268
269 /* possible dynamic channel DIMM Label attribute files */
270 CSROWDEV_ATTR(ch0_dimm_label, S_IRUGO | S_IWUSR,
271         channel_dimm_label_show, channel_dimm_label_store, 0);
272 CSROWDEV_ATTR(ch1_dimm_label, S_IRUGO | S_IWUSR,
273         channel_dimm_label_show, channel_dimm_label_store, 1);
274 CSROWDEV_ATTR(ch2_dimm_label, S_IRUGO | S_IWUSR,
275         channel_dimm_label_show, channel_dimm_label_store, 2);
276 CSROWDEV_ATTR(ch3_dimm_label, S_IRUGO | S_IWUSR,
277         channel_dimm_label_show, channel_dimm_label_store, 3);
278 CSROWDEV_ATTR(ch4_dimm_label, S_IRUGO | S_IWUSR,
279         channel_dimm_label_show, channel_dimm_label_store, 4);
280 CSROWDEV_ATTR(ch5_dimm_label, S_IRUGO | S_IWUSR,
281         channel_dimm_label_show, channel_dimm_label_store, 5);
282
283 /* Total possible dynamic DIMM Label attribute file table */
284 static struct csrowdev_attribute *dynamic_csrow_dimm_attr[] = {
285         &attr_ch0_dimm_label,
286         &attr_ch1_dimm_label,
287         &attr_ch2_dimm_label,
288         &attr_ch3_dimm_label,
289         &attr_ch4_dimm_label,
290         &attr_ch5_dimm_label
291 };
292
293 /* possible dynamic channel ce_count attribute files */
294 CSROWDEV_ATTR(ch0_ce_count, S_IRUGO | S_IWUSR, channel_ce_count_show, NULL, 0);
295 CSROWDEV_ATTR(ch1_ce_count, S_IRUGO | S_IWUSR, channel_ce_count_show, NULL, 1);
296 CSROWDEV_ATTR(ch2_ce_count, S_IRUGO | S_IWUSR, channel_ce_count_show, NULL, 2);
297 CSROWDEV_ATTR(ch3_ce_count, S_IRUGO | S_IWUSR, channel_ce_count_show, NULL, 3);
298 CSROWDEV_ATTR(ch4_ce_count, S_IRUGO | S_IWUSR, channel_ce_count_show, NULL, 4);
299 CSROWDEV_ATTR(ch5_ce_count, S_IRUGO | S_IWUSR, channel_ce_count_show, NULL, 5);
300
301 /* Total possible dynamic ce_count attribute file table */
302 static struct csrowdev_attribute *dynamic_csrow_ce_count_attr[] = {
303         &attr_ch0_ce_count,
304         &attr_ch1_ce_count,
305         &attr_ch2_ce_count,
306         &attr_ch3_ce_count,
307         &attr_ch4_ce_count,
308         &attr_ch5_ce_count
309 };
310
311 #define EDAC_NR_CHANNELS        6
312
313 /* Create dynamic CHANNEL files, indexed by 'chan',  under specifed CSROW */
314 static int edac_create_channel_files(struct kobject *kobj, int chan)
315 {
316         int err = -ENODEV;
317
318         if (chan >= EDAC_NR_CHANNELS)
319                 return err;
320
321         /* create the DIMM label attribute file */
322         err = sysfs_create_file(kobj,
323                                 (struct attribute *)
324                                 dynamic_csrow_dimm_attr[chan]);
325
326         if (!err) {
327                 /* create the CE Count attribute file */
328                 err = sysfs_create_file(kobj,
329                                         (struct attribute *)
330                                         dynamic_csrow_ce_count_attr[chan]);
331         } else {
332                 debugf1("%s()  dimm labels and ce_count files created",
333                         __func__);
334         }
335
336         return err;
337 }
338
339 /* No memory to release for this kobj */
340 static void edac_csrow_instance_release(struct kobject *kobj)
341 {
342         struct mem_ctl_info *mci;
343         struct csrow_info *cs;
344
345         debugf1("%s()\n", __func__);
346
347         cs = container_of(kobj, struct csrow_info, kobj);
348         mci = cs->mci;
349
350         kobject_put(&mci->edac_mci_kobj);
351 }
352
353 /* the kobj_type instance for a CSROW */
354 static struct kobj_type ktype_csrow = {
355         .release = edac_csrow_instance_release,
356         .sysfs_ops = &csrowfs_ops,
357         .default_attrs = (struct attribute **)default_csrow_attr,
358 };
359
360 /* Create a CSROW object under specifed edac_mc_device */
361 static int edac_create_csrow_object(struct mem_ctl_info *mci,
362                                         struct csrow_info *csrow, int index)
363 {
364         struct kobject *kobj_mci = &mci->edac_mci_kobj;
365         struct kobject *kobj;
366         int chan;
367         int err;
368
369         /* generate ..../edac/mc/mc<id>/csrow<index>   */
370         memset(&csrow->kobj, 0, sizeof(csrow->kobj));
371         csrow->mci = mci;       /* include container up link */
372
373         /* bump the mci instance's kobject's ref count */
374         kobj = kobject_get(&mci->edac_mci_kobj);
375         if (!kobj) {
376                 err = -ENODEV;
377                 goto err_out;
378         }
379
380         /* Instanstiate the csrow object */
381         err = kobject_init_and_add(&csrow->kobj, &ktype_csrow, kobj_mci,
382                                    "csrow%d", index);
383         if (err)
384                 goto err_release_top_kobj;
385
386         /* At this point, to release a csrow kobj, one must
387          * call the kobject_put and allow that tear down
388          * to work the releasing
389          */
390
391         /* Create the dyanmic attribute files on this csrow,
392          * namely, the DIMM labels and the channel ce_count
393          */
394         for (chan = 0; chan < csrow->nr_channels; chan++) {
395                 err = edac_create_channel_files(&csrow->kobj, chan);
396                 if (err) {
397                         /* special case the unregister here */
398                         kobject_put(&csrow->kobj);
399                         goto err_out;
400                 }
401         }
402         kobject_uevent(&csrow->kobj, KOBJ_ADD);
403         return 0;
404
405         /* error unwind stack */
406 err_release_top_kobj:
407         kobject_put(&mci->edac_mci_kobj);
408
409 err_out:
410         return err;
411 }
412
413 /* default sysfs methods and data structures for the main MCI kobject */
414
415 static ssize_t mci_reset_counters_store(struct mem_ctl_info *mci,
416                                         const char *data, size_t count)
417 {
418         int row, chan;
419
420         mci->ue_noinfo_count = 0;
421         mci->ce_noinfo_count = 0;
422         mci->ue_count = 0;
423         mci->ce_count = 0;
424
425         for (row = 0; row < mci->nr_csrows; row++) {
426                 struct csrow_info *ri = &mci->csrows[row];
427
428                 ri->ue_count = 0;
429                 ri->ce_count = 0;
430
431                 for (chan = 0; chan < ri->nr_channels; chan++)
432                         ri->channels[chan].ce_count = 0;
433         }
434
435         mci->start_time = jiffies;
436         return count;
437 }
438
439 /* memory scrubbing */
440 static ssize_t mci_sdram_scrub_rate_store(struct mem_ctl_info *mci,
441                                           const char *data, size_t count)
442 {
443         unsigned long bandwidth = 0;
444         int err;
445
446         if (!mci->set_sdram_scrub_rate) {
447                 edac_printk(KERN_WARNING, EDAC_MC,
448                             "Memory scrub rate setting not implemented!\n");
449                 return -EINVAL;
450         }
451
452         if (strict_strtoul(data, 10, &bandwidth) < 0)
453                 return -EINVAL;
454
455         err = mci->set_sdram_scrub_rate(mci, (u32)bandwidth);
456         if (err) {
457                 edac_printk(KERN_DEBUG, EDAC_MC,
458                             "Failed setting scrub rate to %lu\n", bandwidth);
459                 return -EINVAL;
460         }
461         else {
462                 edac_printk(KERN_DEBUG, EDAC_MC,
463                             "Scrub rate set to: %lu\n", bandwidth);
464                 return count;
465         }
466 }
467
468 static ssize_t mci_sdram_scrub_rate_show(struct mem_ctl_info *mci, char *data)
469 {
470         u32 bandwidth = 0;
471         int err;
472
473         if (!mci->get_sdram_scrub_rate) {
474                 edac_printk(KERN_WARNING, EDAC_MC,
475                             "Memory scrub rate reading not implemented\n");
476                 return -EINVAL;
477         }
478
479         err = mci->get_sdram_scrub_rate(mci, &bandwidth);
480         if (err) {
481                 edac_printk(KERN_DEBUG, EDAC_MC, "Error reading scrub rate\n");
482                 return err;
483         }
484         else {
485                 edac_printk(KERN_DEBUG, EDAC_MC,
486                             "Read scrub rate: %d\n", bandwidth);
487                 return sprintf(data, "%d\n", bandwidth);
488         }
489 }
490
491 /* default attribute files for the MCI object */
492 static ssize_t mci_ue_count_show(struct mem_ctl_info *mci, char *data)
493 {
494         return sprintf(data, "%d\n", mci->ue_count);
495 }
496
497 static ssize_t mci_ce_count_show(struct mem_ctl_info *mci, char *data)
498 {
499         return sprintf(data, "%d\n", mci->ce_count);
500 }
501
502 static ssize_t mci_ce_noinfo_show(struct mem_ctl_info *mci, char *data)
503 {
504         return sprintf(data, "%d\n", mci->ce_noinfo_count);
505 }
506
507 static ssize_t mci_ue_noinfo_show(struct mem_ctl_info *mci, char *data)
508 {
509         return sprintf(data, "%d\n", mci->ue_noinfo_count);
510 }
511
512 static ssize_t mci_seconds_show(struct mem_ctl_info *mci, char *data)
513 {
514         return sprintf(data, "%ld\n", (jiffies - mci->start_time) / HZ);
515 }
516
517 static ssize_t mci_ctl_name_show(struct mem_ctl_info *mci, char *data)
518 {
519         return sprintf(data, "%s\n", mci->ctl_name);
520 }
521
522 static ssize_t mci_size_mb_show(struct mem_ctl_info *mci, char *data)
523 {
524         int total_pages, csrow_idx;
525
526         for (total_pages = csrow_idx = 0; csrow_idx < mci->nr_csrows;
527                 csrow_idx++) {
528                 struct csrow_info *csrow = &mci->csrows[csrow_idx];
529
530                 if (!csrow->nr_pages)
531                         continue;
532
533                 total_pages += csrow->nr_pages;
534         }
535
536         return sprintf(data, "%u\n", PAGES_TO_MiB(total_pages));
537 }
538
539 #define to_mci(k) container_of(k, struct mem_ctl_info, edac_mci_kobj)
540 #define to_mcidev_attr(a) container_of(a,struct mcidev_sysfs_attribute,attr)
541
542 /* MCI show/store functions for top most object */
543 static ssize_t mcidev_show(struct kobject *kobj, struct attribute *attr,
544                         char *buffer)
545 {
546         struct mem_ctl_info *mem_ctl_info = to_mci(kobj);
547         struct mcidev_sysfs_attribute *mcidev_attr = to_mcidev_attr(attr);
548
549         debugf1("%s() mem_ctl_info %p\n", __func__, mem_ctl_info);
550
551         if (mcidev_attr->show)
552                 return mcidev_attr->show(mem_ctl_info, buffer);
553
554         return -EIO;
555 }
556
557 static ssize_t mcidev_store(struct kobject *kobj, struct attribute *attr,
558                         const char *buffer, size_t count)
559 {
560         struct mem_ctl_info *mem_ctl_info = to_mci(kobj);
561         struct mcidev_sysfs_attribute *mcidev_attr = to_mcidev_attr(attr);
562
563         debugf1("%s() mem_ctl_info %p\n", __func__, mem_ctl_info);
564
565         if (mcidev_attr->store)
566                 return mcidev_attr->store(mem_ctl_info, buffer, count);
567
568         return -EIO;
569 }
570
571 /* Intermediate show/store table */
572 static const struct sysfs_ops mci_ops = {
573         .show = mcidev_show,
574         .store = mcidev_store
575 };
576
577 #define MCIDEV_ATTR(_name,_mode,_show,_store)                   \
578 static struct mcidev_sysfs_attribute mci_attr_##_name = {                       \
579         .attr = {.name = __stringify(_name), .mode = _mode },   \
580         .show   = _show,                                        \
581         .store  = _store,                                       \
582 };
583
584 /* default Control file */
585 MCIDEV_ATTR(reset_counters, S_IWUSR, NULL, mci_reset_counters_store);
586
587 /* default Attribute files */
588 MCIDEV_ATTR(mc_name, S_IRUGO, mci_ctl_name_show, NULL);
589 MCIDEV_ATTR(size_mb, S_IRUGO, mci_size_mb_show, NULL);
590 MCIDEV_ATTR(seconds_since_reset, S_IRUGO, mci_seconds_show, NULL);
591 MCIDEV_ATTR(ue_noinfo_count, S_IRUGO, mci_ue_noinfo_show, NULL);
592 MCIDEV_ATTR(ce_noinfo_count, S_IRUGO, mci_ce_noinfo_show, NULL);
593 MCIDEV_ATTR(ue_count, S_IRUGO, mci_ue_count_show, NULL);
594 MCIDEV_ATTR(ce_count, S_IRUGO, mci_ce_count_show, NULL);
595
596 /* memory scrubber attribute file */
597 MCIDEV_ATTR(sdram_scrub_rate, S_IRUGO | S_IWUSR, mci_sdram_scrub_rate_show,
598         mci_sdram_scrub_rate_store);
599
600 static struct mcidev_sysfs_attribute *mci_attr[] = {
601         &mci_attr_reset_counters,
602         &mci_attr_mc_name,
603         &mci_attr_size_mb,
604         &mci_attr_seconds_since_reset,
605         &mci_attr_ue_noinfo_count,
606         &mci_attr_ce_noinfo_count,
607         &mci_attr_ue_count,
608         &mci_attr_ce_count,
609         &mci_attr_sdram_scrub_rate,
610         NULL
611 };
612
613
614 /*
615  * Release of a MC controlling instance
616  *
617  *      each MC control instance has the following resources upon entry:
618  *              a) a ref count on the top memctl kobj
619  *              b) a ref count on this module
620  *
621  *      this function must decrement those ref counts and then
622  *      issue a free on the instance's memory
623  */
624 static void edac_mci_control_release(struct kobject *kobj)
625 {
626         struct mem_ctl_info *mci;
627
628         mci = to_mci(kobj);
629
630         debugf0("%s() mci instance idx=%d releasing\n", __func__, mci->mc_idx);
631
632         /* decrement the module ref count */
633         module_put(mci->owner);
634 }
635
636 static struct kobj_type ktype_mci = {
637         .release = edac_mci_control_release,
638         .sysfs_ops = &mci_ops,
639         .default_attrs = (struct attribute **)mci_attr,
640 };
641
642 /* EDAC memory controller sysfs kset:
643  *      /sys/devices/system/edac/mc
644  */
645 static struct kset *mc_kset;
646
647 /*
648  * edac_mc_register_sysfs_main_kobj
649  *
650  *      setups and registers the main kobject for each mci
651  */
652 int edac_mc_register_sysfs_main_kobj(struct mem_ctl_info *mci)
653 {
654         struct kobject *kobj_mci;
655         int err;
656
657         debugf1("%s()\n", __func__);
658
659         kobj_mci = &mci->edac_mci_kobj;
660
661         /* Init the mci's kobject */
662         memset(kobj_mci, 0, sizeof(*kobj_mci));
663
664         /* Record which module 'owns' this control structure
665          * and bump the ref count of the module
666          */
667         mci->owner = THIS_MODULE;
668
669         /* bump ref count on this module */
670         if (!try_module_get(mci->owner)) {
671                 err = -ENODEV;
672                 goto fail_out;
673         }
674
675         /* this instance become part of the mc_kset */
676         kobj_mci->kset = mc_kset;
677
678         /* register the mc<id> kobject to the mc_kset */
679         err = kobject_init_and_add(kobj_mci, &ktype_mci, NULL,
680                                    "mc%d", mci->mc_idx);
681         if (err) {
682                 debugf1("%s()Failed to register '.../edac/mc%d'\n",
683                         __func__, mci->mc_idx);
684                 goto kobj_reg_fail;
685         }
686         kobject_uevent(kobj_mci, KOBJ_ADD);
687
688         /* At this point, to 'free' the control struct,
689          * edac_mc_unregister_sysfs_main_kobj() must be used
690          */
691
692         debugf1("%s() Registered '.../edac/mc%d' kobject\n",
693                 __func__, mci->mc_idx);
694
695         return 0;
696
697         /* Error exit stack */
698
699 kobj_reg_fail:
700         module_put(mci->owner);
701
702 fail_out:
703         return err;
704 }
705
706 /*
707  * edac_mc_register_sysfs_main_kobj
708  *
709  *      tears down and the main mci kobject from the mc_kset
710  */
711 void edac_mc_unregister_sysfs_main_kobj(struct mem_ctl_info *mci)
712 {
713         debugf1("%s()\n", __func__);
714
715         /* delete the kobj from the mc_kset */
716         kobject_put(&mci->edac_mci_kobj);
717 }
718
719 #define EDAC_DEVICE_SYMLINK     "device"
720
721 #define grp_to_mci(k) (container_of(k, struct mcidev_sysfs_group_kobj, kobj)->mci)
722
723 /* MCI show/store functions for top most object */
724 static ssize_t inst_grp_show(struct kobject *kobj, struct attribute *attr,
725                         char *buffer)
726 {
727         struct mem_ctl_info *mem_ctl_info = grp_to_mci(kobj);
728         struct mcidev_sysfs_attribute *mcidev_attr = to_mcidev_attr(attr);
729
730         debugf1("%s() mem_ctl_info %p\n", __func__, mem_ctl_info);
731
732         if (mcidev_attr->show)
733                 return mcidev_attr->show(mem_ctl_info, buffer);
734
735         return -EIO;
736 }
737
738 static ssize_t inst_grp_store(struct kobject *kobj, struct attribute *attr,
739                         const char *buffer, size_t count)
740 {
741         struct mem_ctl_info *mem_ctl_info = grp_to_mci(kobj);
742         struct mcidev_sysfs_attribute *mcidev_attr = to_mcidev_attr(attr);
743
744         debugf1("%s() mem_ctl_info %p\n", __func__, mem_ctl_info);
745
746         if (mcidev_attr->store)
747                 return mcidev_attr->store(mem_ctl_info, buffer, count);
748
749         return -EIO;
750 }
751
752 /* No memory to release for this kobj */
753 static void edac_inst_grp_release(struct kobject *kobj)
754 {
755         struct mcidev_sysfs_group_kobj *grp;
756         struct mem_ctl_info *mci;
757
758         debugf1("%s()\n", __func__);
759
760         grp = container_of(kobj, struct mcidev_sysfs_group_kobj, kobj);
761         mci = grp->mci;
762 }
763
764 /* Intermediate show/store table */
765 static struct sysfs_ops inst_grp_ops = {
766         .show = inst_grp_show,
767         .store = inst_grp_store
768 };
769
770 /* the kobj_type instance for a instance group */
771 static struct kobj_type ktype_inst_grp = {
772         .release = edac_inst_grp_release,
773         .sysfs_ops = &inst_grp_ops,
774 };
775
776
777 /*
778  * edac_create_mci_instance_attributes
779  *      create MC driver specific attributes bellow an specified kobj
780  * This routine calls itself recursively, in order to create an entire
781  * object tree.
782  */
783 static int edac_create_mci_instance_attributes(struct mem_ctl_info *mci,
784                                 const struct mcidev_sysfs_attribute *sysfs_attrib,
785                                 struct kobject *kobj)
786 {
787         int err;
788
789         debugf1("%s()\n", __func__);
790
791         while (sysfs_attrib) {
792                 debugf1("%s() sysfs_attrib = %p\n",__func__, sysfs_attrib);
793                 if (sysfs_attrib->grp) {
794                         struct mcidev_sysfs_group_kobj *grp_kobj;
795
796                         grp_kobj = kzalloc(sizeof(*grp_kobj), GFP_KERNEL);
797                         if (!grp_kobj)
798                                 return -ENOMEM;
799
800                         grp_kobj->grp = sysfs_attrib->grp;
801                         grp_kobj->mci = mci;
802                         list_add_tail(&grp_kobj->list, &mci->grp_kobj_list);
803
804                         debugf0("%s() grp %s, mci %p\n", __func__,
805                                 sysfs_attrib->grp->name, mci);
806
807                         err = kobject_init_and_add(&grp_kobj->kobj,
808                                                 &ktype_inst_grp,
809                                                 &mci->edac_mci_kobj,
810                                                 sysfs_attrib->grp->name);
811                         if (err < 0) {
812                                 printk(KERN_ERR "kobject_init_and_add failed: %d\n", err);
813                                 return err;
814                         }
815                         err = edac_create_mci_instance_attributes(mci,
816                                         grp_kobj->grp->mcidev_attr,
817                                         &grp_kobj->kobj);
818
819                         if (err < 0)
820                                 return err;
821                 } else if (sysfs_attrib->attr.name) {
822                         debugf0("%s() file %s\n", __func__,
823                                 sysfs_attrib->attr.name);
824
825                         err = sysfs_create_file(kobj, &sysfs_attrib->attr);
826                         if (err < 0) {
827                                 printk(KERN_ERR "sysfs_create_file failed: %d\n", err);
828                                 return err;
829                         }
830                 } else
831                         break;
832
833                 sysfs_attrib++;
834         }
835
836         return 0;
837 }
838
839 /*
840  * edac_remove_mci_instance_attributes
841  *      remove MC driver specific attributes at the topmost level
842  *      directory of this mci instance.
843  */
844 static void edac_remove_mci_instance_attributes(struct mem_ctl_info *mci,
845                                 const struct mcidev_sysfs_attribute *sysfs_attrib,
846                                 struct kobject *kobj, int count)
847 {
848         struct mcidev_sysfs_group_kobj *grp_kobj, *tmp;
849
850         debugf1("%s()\n", __func__);
851
852         /*
853          * loop if there are attributes and until we hit a NULL entry
854          * Remove first all the atributes
855          */
856         while (sysfs_attrib) {
857                 debugf1("%s() sysfs_attrib = %p\n",__func__, sysfs_attrib);
858                 if (sysfs_attrib->grp) {
859                         debugf1("%s() seeking for group %s\n",
860                                 __func__, sysfs_attrib->grp->name);
861                         list_for_each_entry(grp_kobj,
862                                             &mci->grp_kobj_list, list) {
863                                 debugf1("%s() grp_kobj->grp = %p\n",__func__, grp_kobj->grp);
864                                 if (grp_kobj->grp == sysfs_attrib->grp) {
865                                         edac_remove_mci_instance_attributes(mci,
866                                                     grp_kobj->grp->mcidev_attr,
867                                                     &grp_kobj->kobj, count + 1);
868                                         debugf0("%s() group %s\n", __func__,
869                                                 sysfs_attrib->grp->name);
870                                         kobject_put(&grp_kobj->kobj);
871                                 }
872                         }
873                         debugf1("%s() end of seeking for group %s\n",
874                                 __func__, sysfs_attrib->grp->name);
875                 } else if (sysfs_attrib->attr.name) {
876                         debugf0("%s() file %s\n", __func__,
877                                 sysfs_attrib->attr.name);
878                         sysfs_remove_file(kobj, &sysfs_attrib->attr);
879                 } else
880                         break;
881                 sysfs_attrib++;
882         }
883
884         /* Remove the group objects */
885         if (count)
886                 return;
887         list_for_each_entry_safe(grp_kobj, tmp,
888                                  &mci->grp_kobj_list, list) {
889                 list_del(&grp_kobj->list);
890                 kfree(grp_kobj);
891         }
892 }
893
894
895 /*
896  * Create a new Memory Controller kobject instance,
897  *      mc<id> under the 'mc' directory
898  *
899  * Return:
900  *      0       Success
901  *      !0      Failure
902  */
903 int edac_create_sysfs_mci_device(struct mem_ctl_info *mci)
904 {
905         int i;
906         int err;
907         struct csrow_info *csrow;
908         struct kobject *kobj_mci = &mci->edac_mci_kobj;
909
910         debugf0("%s() idx=%d\n", __func__, mci->mc_idx);
911
912         INIT_LIST_HEAD(&mci->grp_kobj_list);
913
914         /* create a symlink for the device */
915         err = sysfs_create_link(kobj_mci, &mci->dev->kobj,
916                                 EDAC_DEVICE_SYMLINK);
917         if (err) {
918                 debugf1("%s() failure to create symlink\n", __func__);
919                 goto fail0;
920         }
921
922         /* If the low level driver desires some attributes,
923          * then create them now for the driver.
924          */
925         if (mci->mc_driver_sysfs_attributes) {
926                 err = edac_create_mci_instance_attributes(mci,
927                                         mci->mc_driver_sysfs_attributes,
928                                         &mci->edac_mci_kobj);
929                 if (err) {
930                         debugf1("%s() failure to create mci attributes\n",
931                                 __func__);
932                         goto fail0;
933                 }
934         }
935
936         /* Make directories for each CSROW object under the mc<id> kobject
937          */
938         for (i = 0; i < mci->nr_csrows; i++) {
939                 csrow = &mci->csrows[i];
940
941                 /* Only expose populated CSROWs */
942                 if (csrow->nr_pages > 0) {
943                         err = edac_create_csrow_object(mci, csrow, i);
944                         if (err) {
945                                 debugf1("%s() failure: create csrow %d obj\n",
946                                         __func__, i);
947                                 goto fail1;
948                         }
949                 }
950         }
951
952         return 0;
953
954         /* CSROW error: backout what has already been registered,  */
955 fail1:
956         for (i--; i >= 0; i--) {
957                 if (csrow->nr_pages > 0) {
958                         kobject_put(&mci->csrows[i].kobj);
959                 }
960         }
961
962         /* remove the mci instance's attributes, if any */
963         edac_remove_mci_instance_attributes(mci,
964                 mci->mc_driver_sysfs_attributes, &mci->edac_mci_kobj, 0);
965
966         /* remove the symlink */
967         sysfs_remove_link(kobj_mci, EDAC_DEVICE_SYMLINK);
968
969 fail0:
970         return err;
971 }
972
973 /*
974  * remove a Memory Controller instance
975  */
976 void edac_remove_sysfs_mci_device(struct mem_ctl_info *mci)
977 {
978         int i;
979
980         debugf0("%s()\n", __func__);
981
982         /* remove all csrow kobjects */
983         debugf0("%s()  unregister this mci kobj\n", __func__);
984         for (i = 0; i < mci->nr_csrows; i++) {
985                 if (mci->csrows[i].nr_pages > 0) {
986                         debugf0("%s()  unreg csrow-%d\n", __func__, i);
987                         kobject_put(&mci->csrows[i].kobj);
988                 }
989         }
990
991         /* remove this mci instance's attribtes */
992         if (mci->mc_driver_sysfs_attributes) {
993                 debugf0("%s()  unregister mci private attributes\n", __func__);
994                 edac_remove_mci_instance_attributes(mci,
995                                                 mci->mc_driver_sysfs_attributes,
996                                                 &mci->edac_mci_kobj, 0);
997         }
998
999         /* remove the symlink */
1000         debugf0("%s()  remove_link\n", __func__);
1001         sysfs_remove_link(&mci->edac_mci_kobj, EDAC_DEVICE_SYMLINK);
1002
1003         /* unregister this instance's kobject */
1004         debugf0("%s()  remove_mci_instance\n", __func__);
1005         kobject_put(&mci->edac_mci_kobj);
1006 }
1007
1008
1009
1010
1011 /*
1012  * edac_setup_sysfs_mc_kset(void)
1013  *
1014  * Initialize the mc_kset for the 'mc' entry
1015  *      This requires creating the top 'mc' directory with a kset
1016  *      and its controls/attributes.
1017  *
1018  *      To this 'mc' kset, instance 'mci' will be grouped as children.
1019  *
1020  * Return:  0 SUCCESS
1021  *         !0 FAILURE error code
1022  */
1023 int edac_sysfs_setup_mc_kset(void)
1024 {
1025         int err = -EINVAL;
1026         struct sysdev_class *edac_class;
1027
1028         debugf1("%s()\n", __func__);
1029
1030         /* get the /sys/devices/system/edac class reference */
1031         edac_class = edac_get_sysfs_class();
1032         if (edac_class == NULL) {
1033                 debugf1("%s() no edac_class error=%d\n", __func__, err);
1034                 goto fail_out;
1035         }
1036
1037         /* Init the MC's kobject */
1038         mc_kset = kset_create_and_add("mc", NULL, &edac_class->kset.kobj);
1039         if (!mc_kset) {
1040                 err = -ENOMEM;
1041                 debugf1("%s() Failed to register '.../edac/mc'\n", __func__);
1042                 goto fail_kset;
1043         }
1044
1045         debugf1("%s() Registered '.../edac/mc' kobject\n", __func__);
1046
1047         return 0;
1048
1049 fail_kset:
1050         edac_put_sysfs_class();
1051
1052 fail_out:
1053         return err;
1054 }
1055
1056 /*
1057  * edac_sysfs_teardown_mc_kset
1058  *
1059  *      deconstruct the mc_ket for memory controllers
1060  */
1061 void edac_sysfs_teardown_mc_kset(void)
1062 {
1063         kset_unregister(mc_kset);
1064         edac_put_sysfs_class();
1065 }
1066