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