a4135860149b5592e6e73e8036796f63e6f045d4
[~shefty/rdma-dev.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         /* free the mci instance memory here */
636         kfree(mci);
637 }
638
639 static struct kobj_type ktype_mci = {
640         .release = edac_mci_control_release,
641         .sysfs_ops = &mci_ops,
642         .default_attrs = (struct attribute **)mci_attr,
643 };
644
645 /* EDAC memory controller sysfs kset:
646  *      /sys/devices/system/edac/mc
647  */
648 static struct kset *mc_kset;
649
650 /*
651  * edac_mc_register_sysfs_main_kobj
652  *
653  *      setups and registers the main kobject for each mci
654  */
655 int edac_mc_register_sysfs_main_kobj(struct mem_ctl_info *mci)
656 {
657         struct kobject *kobj_mci;
658         int err;
659
660         debugf1("%s()\n", __func__);
661
662         kobj_mci = &mci->edac_mci_kobj;
663
664         /* Init the mci's kobject */
665         memset(kobj_mci, 0, sizeof(*kobj_mci));
666
667         /* Record which module 'owns' this control structure
668          * and bump the ref count of the module
669          */
670         mci->owner = THIS_MODULE;
671
672         /* bump ref count on this module */
673         if (!try_module_get(mci->owner)) {
674                 err = -ENODEV;
675                 goto fail_out;
676         }
677
678         /* this instance become part of the mc_kset */
679         kobj_mci->kset = mc_kset;
680
681         /* register the mc<id> kobject to the mc_kset */
682         err = kobject_init_and_add(kobj_mci, &ktype_mci, NULL,
683                                    "mc%d", mci->mc_idx);
684         if (err) {
685                 debugf1("%s()Failed to register '.../edac/mc%d'\n",
686                         __func__, mci->mc_idx);
687                 goto kobj_reg_fail;
688         }
689         kobject_uevent(kobj_mci, KOBJ_ADD);
690
691         /* At this point, to 'free' the control struct,
692          * edac_mc_unregister_sysfs_main_kobj() must be used
693          */
694
695         debugf1("%s() Registered '.../edac/mc%d' kobject\n",
696                 __func__, mci->mc_idx);
697
698         return 0;
699
700         /* Error exit stack */
701
702 kobj_reg_fail:
703         module_put(mci->owner);
704
705 fail_out:
706         return err;
707 }
708
709 /*
710  * edac_mc_register_sysfs_main_kobj
711  *
712  *      tears down and the main mci kobject from the mc_kset
713  */
714 void edac_mc_unregister_sysfs_main_kobj(struct mem_ctl_info *mci)
715 {
716         /* delete the kobj from the mc_kset */
717         kobject_put(&mci->edac_mci_kobj);
718 }
719
720 #define EDAC_DEVICE_SYMLINK     "device"
721
722 #define grp_to_mci(k) (container_of(k, struct mcidev_sysfs_group_kobj, kobj)->mci)
723
724 /* MCI show/store functions for top most object */
725 static ssize_t inst_grp_show(struct kobject *kobj, struct attribute *attr,
726                         char *buffer)
727 {
728         struct mem_ctl_info *mem_ctl_info = grp_to_mci(kobj);
729         struct mcidev_sysfs_attribute *mcidev_attr = to_mcidev_attr(attr);
730
731         debugf1("%s() mem_ctl_info %p\n", __func__, mem_ctl_info);
732
733         if (mcidev_attr->show)
734                 return mcidev_attr->show(mem_ctl_info, buffer);
735
736         return -EIO;
737 }
738
739 static ssize_t inst_grp_store(struct kobject *kobj, struct attribute *attr,
740                         const char *buffer, size_t count)
741 {
742         struct mem_ctl_info *mem_ctl_info = grp_to_mci(kobj);
743         struct mcidev_sysfs_attribute *mcidev_attr = to_mcidev_attr(attr);
744
745         debugf1("%s() mem_ctl_info %p\n", __func__, mem_ctl_info);
746
747         if (mcidev_attr->store)
748                 return mcidev_attr->store(mem_ctl_info, buffer, count);
749
750         return -EIO;
751 }
752
753 /* No memory to release for this kobj */
754 static void edac_inst_grp_release(struct kobject *kobj)
755 {
756         struct mcidev_sysfs_group_kobj *grp;
757         struct mem_ctl_info *mci;
758
759         debugf1("%s()\n", __func__);
760
761         grp = container_of(kobj, struct mcidev_sysfs_group_kobj, kobj);
762         mci = grp->mci;
763
764         kobject_put(&mci->edac_mci_kobj);
765 }
766
767 /* Intermediate show/store table */
768 static struct sysfs_ops inst_grp_ops = {
769         .show = inst_grp_show,
770         .store = inst_grp_store
771 };
772
773 /* the kobj_type instance for a instance group */
774 static struct kobj_type ktype_inst_grp = {
775         .release = edac_inst_grp_release,
776         .sysfs_ops = &inst_grp_ops,
777 };
778
779
780 /*
781  * edac_create_mci_instance_attributes
782  *      create MC driver specific attributes bellow an specified kobj
783  * This routine calls itself recursively, in order to create an entire
784  * object tree.
785  */
786 static int edac_create_mci_instance_attributes(struct mem_ctl_info *mci,
787                                 struct mcidev_sysfs_attribute *sysfs_attrib,
788                                 struct kobject *kobj)
789 {
790         int err;
791
792         debugf1("%s()\n", __func__);
793
794         while (sysfs_attrib) {
795                 if (sysfs_attrib->grp) {
796                         struct mcidev_sysfs_group_kobj *grp_kobj;
797
798                         grp_kobj = kzalloc(sizeof(*grp_kobj), GFP_KERNEL);
799                         if (!grp_kobj)
800                                 return -ENOMEM;
801
802                         list_add_tail(&grp_kobj->list, &mci->grp_kobj_list);
803
804                         grp_kobj->grp = sysfs_attrib->grp;
805                         grp_kobj->mci = mci;
806
807                         debugf0("%s() grp %s, mci %p\n", __func__,
808                                 sysfs_attrib->grp->name, mci);
809
810                         err = kobject_init_and_add(&grp_kobj->kobj,
811                                                 &ktype_inst_grp,
812                                                 &mci->edac_mci_kobj,
813                                                 sysfs_attrib->grp->name);
814                         if (err)
815                                 return err;
816
817                         err = edac_create_mci_instance_attributes(mci,
818                                         grp_kobj->grp->mcidev_attr,
819                                         &grp_kobj->kobj);
820
821                         if (err)
822                                 return err;
823                 } else if (sysfs_attrib->attr.name) {
824                         debugf0("%s() file %s\n", __func__,
825                                 sysfs_attrib->attr.name);
826
827                         err = sysfs_create_file(kobj, &sysfs_attrib->attr);
828                 } else
829                         break;
830
831                 if (err) {
832                         return err;
833                 }
834                 sysfs_attrib++;
835         }
836
837         return 0;
838 }
839
840 /*
841  * edac_remove_mci_instance_attributes
842  *      remove MC driver specific attributes at the topmost level
843  *      directory of this mci instance.
844  */
845 static void edac_remove_mci_instance_attributes(struct mem_ctl_info *mci,
846                                 struct mcidev_sysfs_attribute *sysfs_attrib,
847                                 struct kobject *kobj, int count)
848 {
849         struct mcidev_sysfs_group_kobj *grp_kobj, *tmp;
850
851         debugf1("%s()\n", __func__);
852
853         /*
854          * loop if there are attributes and until we hit a NULL entry
855          * Remove first all the atributes
856          */
857         while (sysfs_attrib) {
858                 if (sysfs_attrib->grp) {
859                         list_for_each_entry(grp_kobj, &mci->grp_kobj_list,
860                                             list)
861                                 if (grp_kobj->grp == sysfs_attrib->grp)
862                                         edac_remove_mci_instance_attributes(mci,
863                                                     grp_kobj->grp->mcidev_attr,
864                                                     &grp_kobj->kobj, count + 1);
865                 } else if (sysfs_attrib->attr.name) {
866                         debugf0("%s() file %s\n", __func__,
867                                 sysfs_attrib->attr.name);
868                         sysfs_remove_file(kobj, &sysfs_attrib->attr);
869                 } else
870                         break;
871                 sysfs_attrib++;
872         }
873
874         /*
875          * Now that all attributes got removed, it is save to remove all groups
876          */
877         if (!count)
878                 list_for_each_entry_safe(grp_kobj, tmp, &mci->grp_kobj_list,
879                                          list) {
880                         debugf0("%s() grp %s\n", __func__, grp_kobj->grp->name);
881                         kobject_put(&grp_kobj->kobj);
882                 }
883 }
884
885
886 /*
887  * Create a new Memory Controller kobject instance,
888  *      mc<id> under the 'mc' directory
889  *
890  * Return:
891  *      0       Success
892  *      !0      Failure
893  */
894 int edac_create_sysfs_mci_device(struct mem_ctl_info *mci)
895 {
896         int i;
897         int err;
898         struct csrow_info *csrow;
899         struct kobject *kobj_mci = &mci->edac_mci_kobj;
900
901         debugf0("%s() idx=%d\n", __func__, mci->mc_idx);
902
903         INIT_LIST_HEAD(&mci->grp_kobj_list);
904
905         /* create a symlink for the device */
906         err = sysfs_create_link(kobj_mci, &mci->dev->kobj,
907                                 EDAC_DEVICE_SYMLINK);
908         if (err) {
909                 debugf1("%s() failure to create symlink\n", __func__);
910                 goto fail0;
911         }
912
913         /* If the low level driver desires some attributes,
914          * then create them now for the driver.
915          */
916         if (mci->mc_driver_sysfs_attributes) {
917                 err = edac_create_mci_instance_attributes(mci,
918                                         mci->mc_driver_sysfs_attributes,
919                                         &mci->edac_mci_kobj);
920                 if (err) {
921                         debugf1("%s() failure to create mci attributes\n",
922                                 __func__);
923                         goto fail0;
924                 }
925         }
926
927         /* Make directories for each CSROW object under the mc<id> kobject
928          */
929         for (i = 0; i < mci->nr_csrows; i++) {
930                 csrow = &mci->csrows[i];
931
932                 /* Only expose populated CSROWs */
933                 if (csrow->nr_pages > 0) {
934                         err = edac_create_csrow_object(mci, csrow, i);
935                         if (err) {
936                                 debugf1("%s() failure: create csrow %d obj\n",
937                                         __func__, i);
938                                 goto fail1;
939                         }
940                 }
941         }
942
943         return 0;
944
945         /* CSROW error: backout what has already been registered,  */
946 fail1:
947         for (i--; i >= 0; i--) {
948                 if (csrow->nr_pages > 0) {
949                         kobject_put(&mci->csrows[i].kobj);
950                 }
951         }
952
953         /* remove the mci instance's attributes, if any */
954         edac_remove_mci_instance_attributes(mci,
955                 mci->mc_driver_sysfs_attributes, &mci->edac_mci_kobj, 0);
956
957         /* remove the symlink */
958         sysfs_remove_link(kobj_mci, EDAC_DEVICE_SYMLINK);
959
960 fail0:
961         return err;
962 }
963
964 /*
965  * remove a Memory Controller instance
966  */
967 void edac_remove_sysfs_mci_device(struct mem_ctl_info *mci)
968 {
969         int i;
970
971         debugf0("%s()\n", __func__);
972
973         /* remove all csrow kobjects */
974         for (i = 0; i < mci->nr_csrows; i++) {
975                 if (mci->csrows[i].nr_pages > 0) {
976                         debugf0("%s()  unreg csrow-%d\n", __func__, i);
977                         kobject_put(&mci->csrows[i].kobj);
978                 }
979         }
980
981         debugf0("%s()  remove_link\n", __func__);
982
983         /* remove the symlink */
984         sysfs_remove_link(&mci->edac_mci_kobj, EDAC_DEVICE_SYMLINK);
985
986         debugf0("%s()  remove_mci_instance\n", __func__);
987
988         /* remove this mci instance's attribtes */
989         edac_remove_mci_instance_attributes(mci,
990                                             mci->mc_driver_sysfs_attributes,
991                                             &mci->edac_mci_kobj, 0);
992         debugf0("%s()  unregister this mci kobj\n", __func__);
993
994         /* unregister this instance's kobject */
995         kobject_put(&mci->edac_mci_kobj);
996 }
997
998
999
1000
1001 /*
1002  * edac_setup_sysfs_mc_kset(void)
1003  *
1004  * Initialize the mc_kset for the 'mc' entry
1005  *      This requires creating the top 'mc' directory with a kset
1006  *      and its controls/attributes.
1007  *
1008  *      To this 'mc' kset, instance 'mci' will be grouped as children.
1009  *
1010  * Return:  0 SUCCESS
1011  *         !0 FAILURE error code
1012  */
1013 int edac_sysfs_setup_mc_kset(void)
1014 {
1015         int err = -EINVAL;
1016         struct sysdev_class *edac_class;
1017
1018         debugf1("%s()\n", __func__);
1019
1020         /* get the /sys/devices/system/edac class reference */
1021         edac_class = edac_get_sysfs_class();
1022         if (edac_class == NULL) {
1023                 debugf1("%s() no edac_class error=%d\n", __func__, err);
1024                 goto fail_out;
1025         }
1026
1027         /* Init the MC's kobject */
1028         mc_kset = kset_create_and_add("mc", NULL, &edac_class->kset.kobj);
1029         if (!mc_kset) {
1030                 err = -ENOMEM;
1031                 debugf1("%s() Failed to register '.../edac/mc'\n", __func__);
1032                 goto fail_kset;
1033         }
1034
1035         debugf1("%s() Registered '.../edac/mc' kobject\n", __func__);
1036
1037         return 0;
1038
1039 fail_kset:
1040         edac_put_sysfs_class();
1041
1042 fail_out:
1043         return err;
1044 }
1045
1046 /*
1047  * edac_sysfs_teardown_mc_kset
1048  *
1049  *      deconstruct the mc_ket for memory controllers
1050  */
1051 void edac_sysfs_teardown_mc_kset(void)
1052 {
1053         kset_unregister(mc_kset);
1054         edac_put_sysfs_class();
1055 }
1056