Remove obsolete #include <linux/config.h>
[linux-2.6.git] / drivers / edac / edac_mc.c
1 /*
2  * edac_mc kernel module
3  * (C) 2005 Linux Networx (http://lnxi.com)
4  * This file may be distributed under the terms of the
5  * GNU General Public License.
6  *
7  * Written by Thayne Harbaugh
8  * Based on work by Dan Hollis <goemon at anime dot net> and others.
9  *      http://www.anime.net/~goemon/linux-ecc/
10  *
11  * Modified by Dave Peterson and Doug Thompson
12  *
13  */
14
15 #include <linux/module.h>
16 #include <linux/proc_fs.h>
17 #include <linux/kernel.h>
18 #include <linux/types.h>
19 #include <linux/smp.h>
20 #include <linux/init.h>
21 #include <linux/sysctl.h>
22 #include <linux/highmem.h>
23 #include <linux/timer.h>
24 #include <linux/slab.h>
25 #include <linux/jiffies.h>
26 #include <linux/spinlock.h>
27 #include <linux/list.h>
28 #include <linux/sysdev.h>
29 #include <linux/ctype.h>
30 #include <linux/kthread.h>
31 #include <asm/uaccess.h>
32 #include <asm/page.h>
33 #include <asm/edac.h>
34 #include "edac_mc.h"
35
36 #define EDAC_MC_VERSION "Ver: 2.0.0 " __DATE__
37
38 /* For now, disable the EDAC sysfs code.  The sysfs interface that EDAC
39  * presents to user space needs more thought, and is likely to change
40  * substantially.
41  */
42 #define DISABLE_EDAC_SYSFS
43
44 #ifdef CONFIG_EDAC_DEBUG
45 /* Values of 0 to 4 will generate output */
46 int edac_debug_level = 1;
47 EXPORT_SYMBOL_GPL(edac_debug_level);
48 #endif
49
50 /* EDAC Controls, setable by module parameter, and sysfs */
51 static int log_ue = 1;
52 static int log_ce = 1;
53 static int panic_on_ue;
54 static int poll_msec = 1000;
55
56 static int check_pci_parity = 0;        /* default YES check PCI parity */
57 static int panic_on_pci_parity;         /* default no panic on PCI Parity */
58 static atomic_t pci_parity_count = ATOMIC_INIT(0);
59
60 /* lock to memory controller's control array */
61 static DECLARE_MUTEX(mem_ctls_mutex);
62 static struct list_head mc_devices = LIST_HEAD_INIT(mc_devices);
63
64 static struct task_struct *edac_thread;
65
66 /* Structure of the whitelist and blacklist arrays */
67 struct edac_pci_device_list {
68         unsigned int  vendor;           /* Vendor ID */
69         unsigned int  device;           /* Deviice ID */
70 };
71
72 #define MAX_LISTED_PCI_DEVICES          32
73
74 /* List of PCI devices (vendor-id:device-id) that should be skipped */
75 static struct edac_pci_device_list pci_blacklist[MAX_LISTED_PCI_DEVICES];
76 static int pci_blacklist_count;
77
78 /* List of PCI devices (vendor-id:device-id) that should be scanned */
79 static struct edac_pci_device_list pci_whitelist[MAX_LISTED_PCI_DEVICES];
80 static int pci_whitelist_count ;
81
82 /*  START sysfs data and methods */
83
84 #ifndef DISABLE_EDAC_SYSFS
85
86 static const char *mem_types[] = {
87         [MEM_EMPTY] = "Empty",
88         [MEM_RESERVED] = "Reserved",
89         [MEM_UNKNOWN] = "Unknown",
90         [MEM_FPM] = "FPM",
91         [MEM_EDO] = "EDO",
92         [MEM_BEDO] = "BEDO",
93         [MEM_SDR] = "Unbuffered-SDR",
94         [MEM_RDR] = "Registered-SDR",
95         [MEM_DDR] = "Unbuffered-DDR",
96         [MEM_RDDR] = "Registered-DDR",
97         [MEM_RMBS] = "RMBS"
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 /* sysfs object: /sys/devices/system/edac */
125 static struct sysdev_class edac_class = {
126         set_kset_name("edac"),
127 };
128
129 /* sysfs objects:
130  *      /sys/devices/system/edac/mc
131  *      /sys/devices/system/edac/pci
132  */
133 static struct kobject edac_memctrl_kobj;
134 static struct kobject edac_pci_kobj;
135
136 /* We use these to wait for the reference counts on edac_memctrl_kobj and
137  * edac_pci_kobj to reach 0.
138  */
139 static struct completion edac_memctrl_kobj_complete;
140 static struct completion edac_pci_kobj_complete;
141
142 /*
143  * /sys/devices/system/edac/mc;
144  *      data structures and methods
145  */
146 #if 0
147 static ssize_t memctrl_string_show(void *ptr, char *buffer)
148 {
149         char *value = (char*) ptr;
150         return sprintf(buffer, "%s\n", value);
151 }
152 #endif
153
154 static ssize_t memctrl_int_show(void *ptr, char *buffer)
155 {
156         int *value = (int*) ptr;
157         return sprintf(buffer, "%d\n", *value);
158 }
159
160 static ssize_t memctrl_int_store(void *ptr, const char *buffer, size_t count)
161 {
162         int *value = (int*) ptr;
163
164         if (isdigit(*buffer))
165                 *value = simple_strtoul(buffer, NULL, 0);
166
167         return count;
168 }
169
170 struct memctrl_dev_attribute {
171         struct attribute attr;
172         void *value;
173         ssize_t (*show)(void *,char *);
174         ssize_t (*store)(void *, const char *, size_t);
175 };
176
177 /* Set of show/store abstract level functions for memory control object */
178 static ssize_t memctrl_dev_show(struct kobject *kobj,
179                 struct attribute *attr, char *buffer)
180 {
181         struct memctrl_dev_attribute *memctrl_dev;
182         memctrl_dev = (struct memctrl_dev_attribute*)attr;
183
184         if (memctrl_dev->show)
185                 return memctrl_dev->show(memctrl_dev->value, buffer);
186
187         return -EIO;
188 }
189
190 static ssize_t memctrl_dev_store(struct kobject *kobj, struct attribute *attr,
191                 const char *buffer, size_t count)
192 {
193         struct memctrl_dev_attribute *memctrl_dev;
194         memctrl_dev = (struct memctrl_dev_attribute*)attr;
195
196         if (memctrl_dev->store)
197                 return memctrl_dev->store(memctrl_dev->value, buffer, count);
198
199         return -EIO;
200 }
201
202 static struct sysfs_ops memctrlfs_ops = {
203         .show   = memctrl_dev_show,
204         .store  = memctrl_dev_store
205 };
206
207 #define MEMCTRL_ATTR(_name,_mode,_show,_store)                  \
208 struct memctrl_dev_attribute attr_##_name = {                   \
209         .attr = {.name = __stringify(_name), .mode = _mode },   \
210         .value  = &_name,                                       \
211         .show   = _show,                                        \
212         .store  = _store,                                       \
213 };
214
215 #define MEMCTRL_STRING_ATTR(_name,_data,_mode,_show,_store)     \
216 struct memctrl_dev_attribute attr_##_name = {                   \
217         .attr = {.name = __stringify(_name), .mode = _mode },   \
218         .value  = _data,                                        \
219         .show   = _show,                                        \
220         .store  = _store,                                       \
221 };
222
223 /* cwrow<id> attribute f*/
224 #if 0
225 MEMCTRL_STRING_ATTR(mc_version,EDAC_MC_VERSION,S_IRUGO,memctrl_string_show,NULL);
226 #endif
227
228 /* csrow<id> control files */
229 MEMCTRL_ATTR(panic_on_ue,S_IRUGO|S_IWUSR,memctrl_int_show,memctrl_int_store);
230 MEMCTRL_ATTR(log_ue,S_IRUGO|S_IWUSR,memctrl_int_show,memctrl_int_store);
231 MEMCTRL_ATTR(log_ce,S_IRUGO|S_IWUSR,memctrl_int_show,memctrl_int_store);
232 MEMCTRL_ATTR(poll_msec,S_IRUGO|S_IWUSR,memctrl_int_show,memctrl_int_store);
233
234 /* Base Attributes of the memory ECC object */
235 static struct memctrl_dev_attribute *memctrl_attr[] = {
236         &attr_panic_on_ue,
237         &attr_log_ue,
238         &attr_log_ce,
239         &attr_poll_msec,
240         NULL,
241 };
242
243 /* Main MC kobject release() function */
244 static void edac_memctrl_master_release(struct kobject *kobj)
245 {
246         debugf1("%s()\n", __func__);
247         complete(&edac_memctrl_kobj_complete);
248 }
249
250 static struct kobj_type ktype_memctrl = {
251         .release = edac_memctrl_master_release,
252         .sysfs_ops = &memctrlfs_ops,
253         .default_attrs = (struct attribute **) memctrl_attr,
254 };
255
256 #endif  /* DISABLE_EDAC_SYSFS */
257
258 /* Initialize the main sysfs entries for edac:
259  *   /sys/devices/system/edac
260  *
261  * and children
262  *
263  * Return:  0 SUCCESS
264  *         !0 FAILURE
265  */
266 static int edac_sysfs_memctrl_setup(void)
267 #ifdef DISABLE_EDAC_SYSFS
268 {
269         return 0;
270 }
271 #else
272 {
273         int err=0;
274
275         debugf1("%s()\n", __func__);
276
277         /* create the /sys/devices/system/edac directory */
278         err = sysdev_class_register(&edac_class);
279
280         if (!err) {
281                 /* Init the MC's kobject */
282                 memset(&edac_memctrl_kobj, 0, sizeof (edac_memctrl_kobj));
283                 edac_memctrl_kobj.parent = &edac_class.kset.kobj;
284                 edac_memctrl_kobj.ktype = &ktype_memctrl;
285
286                 /* generate sysfs "..../edac/mc"   */
287                 err = kobject_set_name(&edac_memctrl_kobj,"mc");
288
289                 if (!err) {
290                         /* FIXME: maybe new sysdev_create_subdir() */
291                         err = kobject_register(&edac_memctrl_kobj);
292
293                         if (err)
294                                 debugf1("Failed to register '.../edac/mc'\n");
295                         else
296                                 debugf1("Registered '.../edac/mc' kobject\n");
297                 }
298         } else
299                 debugf1("%s() error=%d\n", __func__, err);
300
301         return err;
302 }
303 #endif  /* DISABLE_EDAC_SYSFS */
304
305 /*
306  * MC teardown:
307  *      the '..../edac/mc' kobject followed by '..../edac' itself
308  */
309 static void edac_sysfs_memctrl_teardown(void)
310 {
311 #ifndef DISABLE_EDAC_SYSFS
312         debugf0("MC: " __FILE__ ": %s()\n", __func__);
313
314         /* Unregister the MC's kobject and wait for reference count to reach
315          * 0.
316          */
317         init_completion(&edac_memctrl_kobj_complete);
318         kobject_unregister(&edac_memctrl_kobj);
319         wait_for_completion(&edac_memctrl_kobj_complete);
320
321         /* Unregister the 'edac' object */
322         sysdev_class_unregister(&edac_class);
323 #endif  /* DISABLE_EDAC_SYSFS */
324 }
325
326 #ifndef DISABLE_EDAC_SYSFS
327
328 /*
329  * /sys/devices/system/edac/pci;
330  *      data structures and methods
331  */
332
333 struct list_control {
334         struct edac_pci_device_list *list;
335         int *count;
336 };
337
338 #if 0
339 /* Output the list as:  vendor_id:device:id<,vendor_id:device_id> */
340 static ssize_t edac_pci_list_string_show(void *ptr, char *buffer)
341 {
342         struct list_control *listctl;
343         struct edac_pci_device_list *list;
344         char *p = buffer;
345         int len=0;
346         int i;
347
348         listctl = ptr;
349         list = listctl->list;
350
351         for (i = 0; i < *(listctl->count); i++, list++ ) {
352                 if (len > 0)
353                         len += snprintf(p + len, (PAGE_SIZE-len), ",");
354
355                 len += snprintf(p + len,
356                                 (PAGE_SIZE-len),
357                                 "%x:%x",
358                                 list->vendor,list->device);
359         }
360
361         len += snprintf(p + len,(PAGE_SIZE-len), "\n");
362         return (ssize_t) len;
363 }
364
365 /**
366  *
367  * Scan string from **s to **e looking for one 'vendor:device' tuple
368  * where each field is a hex value
369  *
370  * return 0 if an entry is NOT found
371  * return 1 if an entry is found
372  *      fill in *vendor_id and *device_id with values found
373  *
374  * In both cases, make sure *s has been moved forward toward *e
375  */
376 static int parse_one_device(const char **s,const char **e,
377         unsigned int *vendor_id, unsigned int *device_id)
378 {
379         const char *runner, *p;
380
381         /* if null byte, we are done */
382         if (!**s) {
383                 (*s)++;  /* keep *s moving */
384                 return 0;
385         }
386
387         /* skip over newlines & whitespace */
388         if ((**s == '\n') || isspace(**s)) {
389                 (*s)++;
390                 return 0;
391         }
392
393         if (!isxdigit(**s)) {
394                 (*s)++;
395                 return 0;
396         }
397
398         /* parse vendor_id */
399         runner = *s;
400
401         while (runner < *e) {
402                 /* scan for vendor:device delimiter */
403                 if (*runner == ':') {
404                         *vendor_id = simple_strtol((char*) *s, (char**) &p, 16);
405                         runner = p + 1;
406                         break;
407                 }
408
409                 runner++;
410         }
411
412         if (!isxdigit(*runner)) {
413                 *s = ++runner;
414                 return 0;
415         }
416
417         /* parse device_id */
418         if (runner < *e) {
419                 *device_id = simple_strtol((char*)runner, (char**)&p, 16);
420                 runner = p;
421         }
422
423         *s = runner;
424         return 1;
425 }
426
427 static ssize_t edac_pci_list_string_store(void *ptr, const char *buffer,
428                 size_t count)
429 {
430         struct list_control *listctl;
431         struct edac_pci_device_list *list;
432         unsigned int vendor_id, device_id;
433         const char *s, *e;
434         int *index;
435
436         s = (char*)buffer;
437         e = s + count;
438         listctl = ptr;
439         list = listctl->list;
440         index = listctl->count;
441         *index = 0;
442
443         while (*index < MAX_LISTED_PCI_DEVICES) {
444                 if (parse_one_device(&s,&e,&vendor_id,&device_id)) {
445                         list[ *index ].vendor = vendor_id;
446                         list[ *index ].device = device_id;
447                         (*index)++;
448                 }
449
450                 /* check for all data consume */
451                 if (s >= e)
452                         break;
453         }
454
455         return count;
456 }
457
458 #endif
459 static ssize_t edac_pci_int_show(void *ptr, char *buffer)
460 {
461         int *value = ptr;
462         return sprintf(buffer,"%d\n",*value);
463 }
464
465 static ssize_t edac_pci_int_store(void *ptr, const char *buffer, size_t count)
466 {
467         int *value = ptr;
468
469         if (isdigit(*buffer))
470                 *value = simple_strtoul(buffer,NULL,0);
471
472         return count;
473 }
474
475 struct edac_pci_dev_attribute {
476         struct attribute attr;
477         void *value;
478         ssize_t (*show)(void *,char *);
479         ssize_t (*store)(void *, const char *,size_t);
480 };
481
482 /* Set of show/store abstract level functions for PCI Parity object */
483 static ssize_t edac_pci_dev_show(struct kobject *kobj, struct attribute *attr,
484                 char *buffer)
485 {
486         struct edac_pci_dev_attribute *edac_pci_dev;
487         edac_pci_dev= (struct edac_pci_dev_attribute*)attr;
488
489         if (edac_pci_dev->show)
490                 return edac_pci_dev->show(edac_pci_dev->value, buffer);
491         return -EIO;
492 }
493
494 static ssize_t edac_pci_dev_store(struct kobject *kobj,
495                 struct attribute *attr, const char *buffer, size_t count)
496 {
497         struct edac_pci_dev_attribute *edac_pci_dev;
498         edac_pci_dev= (struct edac_pci_dev_attribute*)attr;
499
500         if (edac_pci_dev->show)
501                 return edac_pci_dev->store(edac_pci_dev->value, buffer, count);
502         return -EIO;
503 }
504
505 static struct sysfs_ops edac_pci_sysfs_ops = {
506         .show   = edac_pci_dev_show,
507         .store  = edac_pci_dev_store
508 };
509
510 #define EDAC_PCI_ATTR(_name,_mode,_show,_store)                 \
511 struct edac_pci_dev_attribute edac_pci_attr_##_name = {         \
512         .attr = {.name = __stringify(_name), .mode = _mode },   \
513         .value  = &_name,                                       \
514         .show   = _show,                                        \
515         .store  = _store,                                       \
516 };
517
518 #define EDAC_PCI_STRING_ATTR(_name,_data,_mode,_show,_store)    \
519 struct edac_pci_dev_attribute edac_pci_attr_##_name = {         \
520         .attr = {.name = __stringify(_name), .mode = _mode },   \
521         .value  = _data,                                        \
522         .show   = _show,                                        \
523         .store  = _store,                                       \
524 };
525
526 #if 0
527 static struct list_control pci_whitelist_control = {
528         .list = pci_whitelist,
529         .count = &pci_whitelist_count
530 };
531
532 static struct list_control pci_blacklist_control = {
533         .list = pci_blacklist,
534         .count = &pci_blacklist_count
535 };
536
537 /* whitelist attribute */
538 EDAC_PCI_STRING_ATTR(pci_parity_whitelist,
539         &pci_whitelist_control,
540         S_IRUGO|S_IWUSR,
541         edac_pci_list_string_show,
542         edac_pci_list_string_store);
543
544 EDAC_PCI_STRING_ATTR(pci_parity_blacklist,
545         &pci_blacklist_control,
546         S_IRUGO|S_IWUSR,
547         edac_pci_list_string_show,
548         edac_pci_list_string_store);
549 #endif
550
551 /* PCI Parity control files */
552 EDAC_PCI_ATTR(check_pci_parity, S_IRUGO|S_IWUSR, edac_pci_int_show,
553         edac_pci_int_store);
554 EDAC_PCI_ATTR(panic_on_pci_parity, S_IRUGO|S_IWUSR, edac_pci_int_show,
555         edac_pci_int_store);
556 EDAC_PCI_ATTR(pci_parity_count, S_IRUGO, edac_pci_int_show, NULL);
557
558 /* Base Attributes of the memory ECC object */
559 static struct edac_pci_dev_attribute *edac_pci_attr[] = {
560         &edac_pci_attr_check_pci_parity,
561         &edac_pci_attr_panic_on_pci_parity,
562         &edac_pci_attr_pci_parity_count,
563         NULL,
564 };
565
566 /* No memory to release */
567 static void edac_pci_release(struct kobject *kobj)
568 {
569         debugf1("%s()\n", __func__);
570         complete(&edac_pci_kobj_complete);
571 }
572
573 static struct kobj_type ktype_edac_pci = {
574         .release = edac_pci_release,
575         .sysfs_ops = &edac_pci_sysfs_ops,
576         .default_attrs = (struct attribute **) edac_pci_attr,
577 };
578
579 #endif  /* DISABLE_EDAC_SYSFS */
580
581 /**
582  * edac_sysfs_pci_setup()
583  *
584  */
585 static int edac_sysfs_pci_setup(void)
586 #ifdef DISABLE_EDAC_SYSFS
587 {
588         return 0;
589 }
590 #else
591 {
592         int err;
593
594         debugf1("%s()\n", __func__);
595
596         memset(&edac_pci_kobj, 0, sizeof(edac_pci_kobj));
597         edac_pci_kobj.parent = &edac_class.kset.kobj;
598         edac_pci_kobj.ktype = &ktype_edac_pci;
599         err = kobject_set_name(&edac_pci_kobj, "pci");
600
601         if (!err) {
602                 /* Instanstiate the csrow object */
603                 /* FIXME: maybe new sysdev_create_subdir() */
604                 err = kobject_register(&edac_pci_kobj);
605
606                 if (err)
607                         debugf1("Failed to register '.../edac/pci'\n");
608                 else
609                         debugf1("Registered '.../edac/pci' kobject\n");
610         }
611
612         return err;
613 }
614 #endif  /* DISABLE_EDAC_SYSFS */
615
616 static void edac_sysfs_pci_teardown(void)
617 {
618 #ifndef DISABLE_EDAC_SYSFS
619         debugf0("%s()\n", __func__);
620         init_completion(&edac_pci_kobj_complete);
621         kobject_unregister(&edac_pci_kobj);
622         wait_for_completion(&edac_pci_kobj_complete);
623 #endif
624 }
625
626 #ifndef DISABLE_EDAC_SYSFS
627
628 /* EDAC sysfs CSROW data structures and methods */
629
630 /* Set of more detailed csrow<id> attribute show/store functions */
631 static ssize_t csrow_ch0_dimm_label_show(struct csrow_info *csrow, char *data)
632 {
633         ssize_t size = 0;
634
635         if (csrow->nr_channels > 0) {
636                 size = snprintf(data, EDAC_MC_LABEL_LEN,"%s\n",
637                         csrow->channels[0].label);
638         }
639
640         return size;
641 }
642
643 static ssize_t csrow_ch1_dimm_label_show(struct csrow_info *csrow, char *data)
644 {
645         ssize_t size = 0;
646
647         if (csrow->nr_channels > 0) {
648                 size = snprintf(data, EDAC_MC_LABEL_LEN, "%s\n",
649                         csrow->channels[1].label);
650         }
651
652         return size;
653 }
654
655 static ssize_t csrow_ch0_dimm_label_store(struct csrow_info *csrow,
656                 const char *data, size_t size)
657 {
658         ssize_t max_size = 0;
659
660         if (csrow->nr_channels > 0) {
661                 max_size = min((ssize_t)size,(ssize_t)EDAC_MC_LABEL_LEN-1);
662                 strncpy(csrow->channels[0].label, data, max_size);
663                 csrow->channels[0].label[max_size] = '\0';
664         }
665
666         return size;
667 }
668
669 static ssize_t csrow_ch1_dimm_label_store(struct csrow_info *csrow,
670                 const char *data, size_t size)
671 {
672         ssize_t max_size = 0;
673
674         if (csrow->nr_channels > 1) {
675                 max_size = min((ssize_t)size,(ssize_t)EDAC_MC_LABEL_LEN-1);
676                 strncpy(csrow->channels[1].label, data, max_size);
677                 csrow->channels[1].label[max_size] = '\0';
678         }
679
680         return max_size;
681 }
682
683 static ssize_t csrow_ue_count_show(struct csrow_info *csrow, char *data)
684 {
685         return sprintf(data,"%u\n", csrow->ue_count);
686 }
687
688 static ssize_t csrow_ce_count_show(struct csrow_info *csrow, char *data)
689 {
690         return sprintf(data,"%u\n", csrow->ce_count);
691 }
692
693 static ssize_t csrow_ch0_ce_count_show(struct csrow_info *csrow, char *data)
694 {
695         ssize_t size = 0;
696
697         if (csrow->nr_channels > 0) {
698                 size = sprintf(data,"%u\n", csrow->channels[0].ce_count);
699         }
700
701         return size;
702 }
703
704 static ssize_t csrow_ch1_ce_count_show(struct csrow_info *csrow, char *data)
705 {
706         ssize_t size = 0;
707
708         if (csrow->nr_channels > 1) {
709                 size = sprintf(data,"%u\n", csrow->channels[1].ce_count);
710         }
711
712         return size;
713 }
714
715 static ssize_t csrow_size_show(struct csrow_info *csrow, char *data)
716 {
717         return sprintf(data,"%u\n", PAGES_TO_MiB(csrow->nr_pages));
718 }
719
720 static ssize_t csrow_mem_type_show(struct csrow_info *csrow, char *data)
721 {
722         return sprintf(data,"%s\n", mem_types[csrow->mtype]);
723 }
724
725 static ssize_t csrow_dev_type_show(struct csrow_info *csrow, char *data)
726 {
727         return sprintf(data,"%s\n", dev_types[csrow->dtype]);
728 }
729
730 static ssize_t csrow_edac_mode_show(struct csrow_info *csrow, char *data)
731 {
732         return sprintf(data,"%s\n", edac_caps[csrow->edac_mode]);
733 }
734
735 struct csrowdev_attribute {
736         struct attribute attr;
737         ssize_t (*show)(struct csrow_info *,char *);
738         ssize_t (*store)(struct csrow_info *, const char *,size_t);
739 };
740
741 #define to_csrow(k) container_of(k, struct csrow_info, kobj)
742 #define to_csrowdev_attr(a) container_of(a, struct csrowdev_attribute, attr)
743
744 /* Set of show/store higher level functions for csrow objects */
745 static ssize_t csrowdev_show(struct kobject *kobj, struct attribute *attr,
746                 char *buffer)
747 {
748         struct csrow_info *csrow = to_csrow(kobj);
749         struct csrowdev_attribute *csrowdev_attr = to_csrowdev_attr(attr);
750
751         if (csrowdev_attr->show)
752                 return csrowdev_attr->show(csrow, buffer);
753
754         return -EIO;
755 }
756
757 static ssize_t csrowdev_store(struct kobject *kobj, struct attribute *attr,
758                 const char *buffer, size_t count)
759 {
760         struct csrow_info *csrow = to_csrow(kobj);
761         struct csrowdev_attribute * csrowdev_attr = to_csrowdev_attr(attr);
762
763         if (csrowdev_attr->store)
764                 return csrowdev_attr->store(csrow, buffer, count);
765
766         return -EIO;
767 }
768
769 static struct sysfs_ops csrowfs_ops = {
770         .show   = csrowdev_show,
771         .store  = csrowdev_store
772 };
773
774 #define CSROWDEV_ATTR(_name,_mode,_show,_store)                 \
775 struct csrowdev_attribute attr_##_name = {                      \
776         .attr = {.name = __stringify(_name), .mode = _mode },   \
777         .show   = _show,                                        \
778         .store  = _store,                                       \
779 };
780
781 /* cwrow<id>/attribute files */
782 CSROWDEV_ATTR(size_mb,S_IRUGO,csrow_size_show,NULL);
783 CSROWDEV_ATTR(dev_type,S_IRUGO,csrow_dev_type_show,NULL);
784 CSROWDEV_ATTR(mem_type,S_IRUGO,csrow_mem_type_show,NULL);
785 CSROWDEV_ATTR(edac_mode,S_IRUGO,csrow_edac_mode_show,NULL);
786 CSROWDEV_ATTR(ue_count,S_IRUGO,csrow_ue_count_show,NULL);
787 CSROWDEV_ATTR(ce_count,S_IRUGO,csrow_ce_count_show,NULL);
788 CSROWDEV_ATTR(ch0_ce_count,S_IRUGO,csrow_ch0_ce_count_show,NULL);
789 CSROWDEV_ATTR(ch1_ce_count,S_IRUGO,csrow_ch1_ce_count_show,NULL);
790
791 /* control/attribute files */
792 CSROWDEV_ATTR(ch0_dimm_label,S_IRUGO|S_IWUSR,
793                 csrow_ch0_dimm_label_show,
794                 csrow_ch0_dimm_label_store);
795 CSROWDEV_ATTR(ch1_dimm_label,S_IRUGO|S_IWUSR,
796                 csrow_ch1_dimm_label_show,
797                 csrow_ch1_dimm_label_store);
798
799 /* Attributes of the CSROW<id> object */
800 static struct csrowdev_attribute *csrow_attr[] = {
801         &attr_dev_type,
802         &attr_mem_type,
803         &attr_edac_mode,
804         &attr_size_mb,
805         &attr_ue_count,
806         &attr_ce_count,
807         &attr_ch0_ce_count,
808         &attr_ch1_ce_count,
809         &attr_ch0_dimm_label,
810         &attr_ch1_dimm_label,
811         NULL,
812 };
813
814 /* No memory to release */
815 static void edac_csrow_instance_release(struct kobject *kobj)
816 {
817         struct csrow_info *cs;
818
819         debugf1("%s()\n", __func__);
820         cs = container_of(kobj, struct csrow_info, kobj);
821         complete(&cs->kobj_complete);
822 }
823
824 static struct kobj_type ktype_csrow = {
825         .release = edac_csrow_instance_release,
826         .sysfs_ops = &csrowfs_ops,
827         .default_attrs = (struct attribute **) csrow_attr,
828 };
829
830 /* Create a CSROW object under specifed edac_mc_device */
831 static int edac_create_csrow_object(struct kobject *edac_mci_kobj,
832                 struct csrow_info *csrow, int index)
833 {
834         int err = 0;
835
836         debugf0("%s()\n", __func__);
837         memset(&csrow->kobj, 0, sizeof(csrow->kobj));
838
839         /* generate ..../edac/mc/mc<id>/csrow<index>   */
840
841         csrow->kobj.parent = edac_mci_kobj;
842         csrow->kobj.ktype = &ktype_csrow;
843
844         /* name this instance of csrow<id> */
845         err = kobject_set_name(&csrow->kobj,"csrow%d",index);
846
847         if (!err) {
848                 /* Instanstiate the csrow object */
849                 err = kobject_register(&csrow->kobj);
850
851                 if (err)
852                         debugf0("Failed to register CSROW%d\n",index);
853                 else
854                         debugf0("Registered CSROW%d\n",index);
855         }
856
857         return err;
858 }
859
860 /* sysfs data structures and methods for the MCI kobjects */
861
862 static ssize_t mci_reset_counters_store(struct mem_ctl_info *mci,
863                 const char *data, size_t count)
864 {
865         int row, chan;
866
867         mci->ue_noinfo_count = 0;
868         mci->ce_noinfo_count = 0;
869         mci->ue_count = 0;
870         mci->ce_count = 0;
871
872         for (row = 0; row < mci->nr_csrows; row++) {
873                 struct csrow_info *ri = &mci->csrows[row];
874
875                 ri->ue_count = 0;
876                 ri->ce_count = 0;
877
878                 for (chan = 0; chan < ri->nr_channels; chan++)
879                         ri->channels[chan].ce_count = 0;
880         }
881
882         mci->start_time = jiffies;
883         return count;
884 }
885
886 static ssize_t mci_ue_count_show(struct mem_ctl_info *mci, char *data)
887 {
888         return sprintf(data,"%d\n", mci->ue_count);
889 }
890
891 static ssize_t mci_ce_count_show(struct mem_ctl_info *mci, char *data)
892 {
893         return sprintf(data,"%d\n", mci->ce_count);
894 }
895
896 static ssize_t mci_ce_noinfo_show(struct mem_ctl_info *mci, char *data)
897 {
898         return sprintf(data,"%d\n", mci->ce_noinfo_count);
899 }
900
901 static ssize_t mci_ue_noinfo_show(struct mem_ctl_info *mci, char *data)
902 {
903         return sprintf(data,"%d\n", mci->ue_noinfo_count);
904 }
905
906 static ssize_t mci_seconds_show(struct mem_ctl_info *mci, char *data)
907 {
908         return sprintf(data,"%ld\n", (jiffies - mci->start_time) / HZ);
909 }
910
911 static ssize_t mci_mod_name_show(struct mem_ctl_info *mci, char *data)
912 {
913         return sprintf(data,"%s %s\n", mci->mod_name, mci->mod_ver);
914 }
915
916 static ssize_t mci_ctl_name_show(struct mem_ctl_info *mci, char *data)
917 {
918         return sprintf(data,"%s\n", mci->ctl_name);
919 }
920
921 static int mci_output_edac_cap(char *buf, unsigned long edac_cap)
922 {
923         char *p = buf;
924         int bit_idx;
925
926         for (bit_idx = 0; bit_idx < 8 * sizeof(edac_cap); bit_idx++) {
927                 if ((edac_cap >> bit_idx) & 0x1)
928                         p += sprintf(p, "%s ", edac_caps[bit_idx]);
929         }
930
931         return p - buf;
932 }
933
934 static ssize_t mci_edac_capability_show(struct mem_ctl_info *mci, char *data)
935 {
936         char *p = data;
937
938         p += mci_output_edac_cap(p,mci->edac_ctl_cap);
939         p += sprintf(p, "\n");
940         return p - data;
941 }
942
943 static ssize_t mci_edac_current_capability_show(struct mem_ctl_info *mci,
944                 char *data)
945 {
946         char *p = data;
947
948         p += mci_output_edac_cap(p,mci->edac_cap);
949         p += sprintf(p, "\n");
950         return p - data;
951 }
952
953 static int mci_output_mtype_cap(char *buf, unsigned long mtype_cap)
954 {
955         char *p = buf;
956         int bit_idx;
957
958         for (bit_idx = 0; bit_idx < 8 * sizeof(mtype_cap); bit_idx++) {
959                 if ((mtype_cap >> bit_idx) & 0x1)
960                         p += sprintf(p, "%s ", mem_types[bit_idx]);
961         }
962
963         return p - buf;
964 }
965
966 static ssize_t mci_supported_mem_type_show(struct mem_ctl_info *mci,
967                 char *data)
968 {
969         char *p = data;
970
971         p += mci_output_mtype_cap(p,mci->mtype_cap);
972         p += sprintf(p, "\n");
973         return p - data;
974 }
975
976 static ssize_t mci_size_mb_show(struct mem_ctl_info *mci, char *data)
977 {
978         int total_pages, csrow_idx;
979
980         for (total_pages = csrow_idx = 0; csrow_idx < mci->nr_csrows;
981                         csrow_idx++) {
982                 struct csrow_info *csrow = &mci->csrows[csrow_idx];
983
984                 if (!csrow->nr_pages)
985                         continue;
986
987                 total_pages += csrow->nr_pages;
988         }
989
990         return sprintf(data,"%u\n", PAGES_TO_MiB(total_pages));
991 }
992
993 struct mcidev_attribute {
994         struct attribute attr;
995         ssize_t (*show)(struct mem_ctl_info *,char *);
996         ssize_t (*store)(struct mem_ctl_info *, const char *,size_t);
997 };
998
999 #define to_mci(k) container_of(k, struct mem_ctl_info, edac_mci_kobj)
1000 #define to_mcidev_attr(a) container_of(a, struct mcidev_attribute, attr)
1001
1002 static ssize_t mcidev_show(struct kobject *kobj, struct attribute *attr,
1003                 char *buffer)
1004 {
1005         struct mem_ctl_info *mem_ctl_info = to_mci(kobj);
1006         struct mcidev_attribute * mcidev_attr = to_mcidev_attr(attr);
1007
1008         if (mcidev_attr->show)
1009                 return mcidev_attr->show(mem_ctl_info, buffer);
1010
1011         return -EIO;
1012 }
1013
1014 static ssize_t mcidev_store(struct kobject *kobj, struct attribute *attr,
1015                 const char *buffer, size_t count)
1016 {
1017         struct mem_ctl_info *mem_ctl_info = to_mci(kobj);
1018         struct mcidev_attribute * mcidev_attr = to_mcidev_attr(attr);
1019
1020         if (mcidev_attr->store)
1021                 return mcidev_attr->store(mem_ctl_info, buffer, count);
1022
1023         return -EIO;
1024 }
1025
1026 static struct sysfs_ops mci_ops = {
1027         .show = mcidev_show,
1028         .store = mcidev_store
1029 };
1030
1031 #define MCIDEV_ATTR(_name,_mode,_show,_store)                   \
1032 struct mcidev_attribute mci_attr_##_name = {                    \
1033         .attr = {.name = __stringify(_name), .mode = _mode },   \
1034         .show   = _show,                                        \
1035         .store  = _store,                                       \
1036 };
1037
1038 /* Control file */
1039 MCIDEV_ATTR(reset_counters,S_IWUSR,NULL,mci_reset_counters_store);
1040
1041 /* Attribute files */
1042 MCIDEV_ATTR(mc_name,S_IRUGO,mci_ctl_name_show,NULL);
1043 MCIDEV_ATTR(module_name,S_IRUGO,mci_mod_name_show,NULL);
1044 MCIDEV_ATTR(edac_capability,S_IRUGO,mci_edac_capability_show,NULL);
1045 MCIDEV_ATTR(size_mb,S_IRUGO,mci_size_mb_show,NULL);
1046 MCIDEV_ATTR(seconds_since_reset,S_IRUGO,mci_seconds_show,NULL);
1047 MCIDEV_ATTR(ue_noinfo_count,S_IRUGO,mci_ue_noinfo_show,NULL);
1048 MCIDEV_ATTR(ce_noinfo_count,S_IRUGO,mci_ce_noinfo_show,NULL);
1049 MCIDEV_ATTR(ue_count,S_IRUGO,mci_ue_count_show,NULL);
1050 MCIDEV_ATTR(ce_count,S_IRUGO,mci_ce_count_show,NULL);
1051 MCIDEV_ATTR(edac_current_capability,S_IRUGO,
1052         mci_edac_current_capability_show,NULL);
1053 MCIDEV_ATTR(supported_mem_type,S_IRUGO,
1054         mci_supported_mem_type_show,NULL);
1055
1056 static struct mcidev_attribute *mci_attr[] = {
1057         &mci_attr_reset_counters,
1058         &mci_attr_module_name,
1059         &mci_attr_mc_name,
1060         &mci_attr_edac_capability,
1061         &mci_attr_edac_current_capability,
1062         &mci_attr_supported_mem_type,
1063         &mci_attr_size_mb,
1064         &mci_attr_seconds_since_reset,
1065         &mci_attr_ue_noinfo_count,
1066         &mci_attr_ce_noinfo_count,
1067         &mci_attr_ue_count,
1068         &mci_attr_ce_count,
1069         NULL
1070 };
1071
1072 /*
1073  * Release of a MC controlling instance
1074  */
1075 static void edac_mci_instance_release(struct kobject *kobj)
1076 {
1077         struct mem_ctl_info *mci;
1078
1079         mci = to_mci(kobj);
1080         debugf0("%s() idx=%d\n", __func__, mci->mc_idx);
1081         complete(&mci->kobj_complete);
1082 }
1083
1084 static struct kobj_type ktype_mci = {
1085         .release = edac_mci_instance_release,
1086         .sysfs_ops = &mci_ops,
1087         .default_attrs = (struct attribute **) mci_attr,
1088 };
1089
1090 #endif  /* DISABLE_EDAC_SYSFS */
1091
1092 #define EDAC_DEVICE_SYMLINK     "device"
1093
1094 /*
1095  * Create a new Memory Controller kobject instance,
1096  *      mc<id> under the 'mc' directory
1097  *
1098  * Return:
1099  *      0       Success
1100  *      !0      Failure
1101  */
1102 static int edac_create_sysfs_mci_device(struct mem_ctl_info *mci)
1103 #ifdef DISABLE_EDAC_SYSFS
1104 {
1105         return 0;
1106 }
1107 #else
1108 {
1109         int i;
1110         int err;
1111         struct csrow_info *csrow;
1112         struct kobject *edac_mci_kobj=&mci->edac_mci_kobj;
1113
1114         debugf0("%s() idx=%d\n", __func__, mci->mc_idx);
1115         memset(edac_mci_kobj, 0, sizeof(*edac_mci_kobj));
1116
1117         /* set the name of the mc<id> object */
1118         err = kobject_set_name(edac_mci_kobj,"mc%d",mci->mc_idx);
1119
1120         if (err)
1121                 return err;
1122
1123         /* link to our parent the '..../edac/mc' object */
1124         edac_mci_kobj->parent = &edac_memctrl_kobj;
1125         edac_mci_kobj->ktype = &ktype_mci;
1126
1127         /* register the mc<id> kobject */
1128         err = kobject_register(edac_mci_kobj);
1129
1130         if (err)
1131                 return err;
1132
1133         /* create a symlink for the device */
1134         err = sysfs_create_link(edac_mci_kobj, &mci->pdev->dev.kobj,
1135                                 EDAC_DEVICE_SYMLINK);
1136
1137         if (err)
1138                 goto fail0;
1139
1140         /* Make directories for each CSROW object
1141          * under the mc<id> kobject
1142          */
1143         for (i = 0; i < mci->nr_csrows; i++) {
1144                 csrow = &mci->csrows[i];
1145
1146                 /* Only expose populated CSROWs */
1147                 if (csrow->nr_pages > 0) {
1148                         err = edac_create_csrow_object(edac_mci_kobj,csrow,i);
1149
1150                         if (err)
1151                                 goto fail1;
1152                 }
1153         }
1154
1155         return 0;
1156
1157         /* CSROW error: backout what has already been registered,  */
1158 fail1:
1159         for ( i--; i >= 0; i--) {
1160                 if (csrow->nr_pages > 0) {
1161                         init_completion(&csrow->kobj_complete);
1162                         kobject_unregister(&mci->csrows[i].kobj);
1163                         wait_for_completion(&csrow->kobj_complete);
1164                 }
1165         }
1166
1167 fail0:
1168         init_completion(&mci->kobj_complete);
1169         kobject_unregister(edac_mci_kobj);
1170         wait_for_completion(&mci->kobj_complete);
1171         return err;
1172 }
1173 #endif  /* DISABLE_EDAC_SYSFS */
1174
1175 /*
1176  * remove a Memory Controller instance
1177  */
1178 static void edac_remove_sysfs_mci_device(struct mem_ctl_info *mci)
1179 {
1180 #ifndef DISABLE_EDAC_SYSFS
1181         int i;
1182
1183         debugf0("%s()\n", __func__);
1184
1185         /* remove all csrow kobjects */
1186         for (i = 0; i < mci->nr_csrows; i++) {
1187                 if (mci->csrows[i].nr_pages > 0) {
1188                         init_completion(&mci->csrows[i].kobj_complete);
1189                         kobject_unregister(&mci->csrows[i].kobj);
1190                         wait_for_completion(&mci->csrows[i].kobj_complete);
1191                 }
1192         }
1193
1194         sysfs_remove_link(&mci->edac_mci_kobj, EDAC_DEVICE_SYMLINK);
1195         init_completion(&mci->kobj_complete);
1196         kobject_unregister(&mci->edac_mci_kobj);
1197         wait_for_completion(&mci->kobj_complete);
1198 #endif  /* DISABLE_EDAC_SYSFS */
1199 }
1200
1201 /* END OF sysfs data and methods */
1202
1203 #ifdef CONFIG_EDAC_DEBUG
1204
1205 void edac_mc_dump_channel(struct channel_info *chan)
1206 {
1207         debugf4("\tchannel = %p\n", chan);
1208         debugf4("\tchannel->chan_idx = %d\n", chan->chan_idx);
1209         debugf4("\tchannel->ce_count = %d\n", chan->ce_count);
1210         debugf4("\tchannel->label = '%s'\n", chan->label);
1211         debugf4("\tchannel->csrow = %p\n\n", chan->csrow);
1212 }
1213 EXPORT_SYMBOL_GPL(edac_mc_dump_channel);
1214
1215 void edac_mc_dump_csrow(struct csrow_info *csrow)
1216 {
1217         debugf4("\tcsrow = %p\n", csrow);
1218         debugf4("\tcsrow->csrow_idx = %d\n", csrow->csrow_idx);
1219         debugf4("\tcsrow->first_page = 0x%lx\n",
1220                 csrow->first_page);
1221         debugf4("\tcsrow->last_page = 0x%lx\n", csrow->last_page);
1222         debugf4("\tcsrow->page_mask = 0x%lx\n", csrow->page_mask);
1223         debugf4("\tcsrow->nr_pages = 0x%x\n", csrow->nr_pages);
1224         debugf4("\tcsrow->nr_channels = %d\n",
1225                 csrow->nr_channels);
1226         debugf4("\tcsrow->channels = %p\n", csrow->channels);
1227         debugf4("\tcsrow->mci = %p\n\n", csrow->mci);
1228 }
1229 EXPORT_SYMBOL_GPL(edac_mc_dump_csrow);
1230
1231 void edac_mc_dump_mci(struct mem_ctl_info *mci)
1232 {
1233         debugf3("\tmci = %p\n", mci);
1234         debugf3("\tmci->mtype_cap = %lx\n", mci->mtype_cap);
1235         debugf3("\tmci->edac_ctl_cap = %lx\n", mci->edac_ctl_cap);
1236         debugf3("\tmci->edac_cap = %lx\n", mci->edac_cap);
1237         debugf4("\tmci->edac_check = %p\n", mci->edac_check);
1238         debugf3("\tmci->nr_csrows = %d, csrows = %p\n",
1239                 mci->nr_csrows, mci->csrows);
1240         debugf3("\tpdev = %p\n", mci->pdev);
1241         debugf3("\tmod_name:ctl_name = %s:%s\n",
1242                 mci->mod_name, mci->ctl_name);
1243         debugf3("\tpvt_info = %p\n\n", mci->pvt_info);
1244 }
1245 EXPORT_SYMBOL_GPL(edac_mc_dump_mci);
1246
1247 #endif  /* CONFIG_EDAC_DEBUG */
1248
1249 /* 'ptr' points to a possibly unaligned item X such that sizeof(X) is 'size'.
1250  * Adjust 'ptr' so that its alignment is at least as stringent as what the
1251  * compiler would provide for X and return the aligned result.
1252  *
1253  * If 'size' is a constant, the compiler will optimize this whole function
1254  * down to either a no-op or the addition of a constant to the value of 'ptr'.
1255  */
1256 static inline char * align_ptr(void *ptr, unsigned size)
1257 {
1258         unsigned align, r;
1259
1260         /* Here we assume that the alignment of a "long long" is the most
1261          * stringent alignment that the compiler will ever provide by default.
1262          * As far as I know, this is a reasonable assumption.
1263          */
1264         if (size > sizeof(long))
1265                 align = sizeof(long long);
1266         else if (size > sizeof(int))
1267                 align = sizeof(long);
1268         else if (size > sizeof(short))
1269                 align = sizeof(int);
1270         else if (size > sizeof(char))
1271                 align = sizeof(short);
1272         else
1273                 return (char *) ptr;
1274
1275         r = size % align;
1276
1277         if (r == 0)
1278                 return (char *) ptr;
1279
1280         return (char *) (((unsigned long) ptr) + align - r);
1281 }
1282
1283 /**
1284  * edac_mc_alloc: Allocate a struct mem_ctl_info structure
1285  * @size_pvt:   size of private storage needed
1286  * @nr_csrows:  Number of CWROWS needed for this MC
1287  * @nr_chans:   Number of channels for the MC
1288  *
1289  * Everything is kmalloc'ed as one big chunk - more efficient.
1290  * Only can be used if all structures have the same lifetime - otherwise
1291  * you have to allocate and initialize your own structures.
1292  *
1293  * Use edac_mc_free() to free mc structures allocated by this function.
1294  *
1295  * Returns:
1296  *      NULL allocation failed
1297  *      struct mem_ctl_info pointer
1298  */
1299 struct mem_ctl_info *edac_mc_alloc(unsigned sz_pvt, unsigned nr_csrows,
1300                 unsigned nr_chans)
1301 {
1302         struct mem_ctl_info *mci;
1303         struct csrow_info *csi, *csrow;
1304         struct channel_info *chi, *chp, *chan;
1305         void *pvt;
1306         unsigned size;
1307         int row, chn;
1308
1309         /* Figure out the offsets of the various items from the start of an mc
1310          * structure.  We want the alignment of each item to be at least as
1311          * stringent as what the compiler would provide if we could simply
1312          * hardcode everything into a single struct.
1313          */
1314         mci = (struct mem_ctl_info *) 0;
1315         csi = (struct csrow_info *)align_ptr(&mci[1], sizeof(*csi));
1316         chi = (struct channel_info *)
1317                         align_ptr(&csi[nr_csrows], sizeof(*chi));
1318         pvt = align_ptr(&chi[nr_chans * nr_csrows], sz_pvt);
1319         size = ((unsigned long) pvt) + sz_pvt;
1320
1321         if ((mci = kmalloc(size, GFP_KERNEL)) == NULL)
1322                 return NULL;
1323
1324         /* Adjust pointers so they point within the memory we just allocated
1325          * rather than an imaginary chunk of memory located at address 0.
1326          */
1327         csi = (struct csrow_info *) (((char *) mci) + ((unsigned long) csi));
1328         chi = (struct channel_info *) (((char *) mci) + ((unsigned long) chi));
1329         pvt = sz_pvt ? (((char *) mci) + ((unsigned long) pvt)) : NULL;
1330
1331         memset(mci, 0, size);  /* clear all fields */
1332         mci->csrows = csi;
1333         mci->pvt_info = pvt;
1334         mci->nr_csrows = nr_csrows;
1335
1336         for (row = 0; row < nr_csrows; row++) {
1337                 csrow = &csi[row];
1338                 csrow->csrow_idx = row;
1339                 csrow->mci = mci;
1340                 csrow->nr_channels = nr_chans;
1341                 chp = &chi[row * nr_chans];
1342                 csrow->channels = chp;
1343
1344                 for (chn = 0; chn < nr_chans; chn++) {
1345                         chan = &chp[chn];
1346                         chan->chan_idx = chn;
1347                         chan->csrow = csrow;
1348                 }
1349         }
1350
1351         return mci;
1352 }
1353 EXPORT_SYMBOL_GPL(edac_mc_alloc);
1354
1355 /**
1356  * edac_mc_free:  Free a previously allocated 'mci' structure
1357  * @mci: pointer to a struct mem_ctl_info structure
1358  */
1359 void edac_mc_free(struct mem_ctl_info *mci)
1360 {
1361         kfree(mci);
1362 }
1363 EXPORT_SYMBOL_GPL(edac_mc_free);
1364
1365 static struct mem_ctl_info *find_mci_by_pdev(struct pci_dev *pdev)
1366 {
1367         struct mem_ctl_info *mci;
1368         struct list_head *item;
1369
1370         debugf3("%s()\n", __func__);
1371
1372         list_for_each(item, &mc_devices) {
1373                 mci = list_entry(item, struct mem_ctl_info, link);
1374
1375                 if (mci->pdev == pdev)
1376                         return mci;
1377         }
1378
1379         return NULL;
1380 }
1381
1382 static int add_mc_to_global_list(struct mem_ctl_info *mci)
1383 {
1384         struct list_head *item, *insert_before;
1385         struct mem_ctl_info *p;
1386         int i;
1387
1388         if (list_empty(&mc_devices)) {
1389                 mci->mc_idx = 0;
1390                 insert_before = &mc_devices;
1391         } else {
1392                 if (find_mci_by_pdev(mci->pdev)) {
1393                         edac_printk(KERN_WARNING, EDAC_MC,
1394                                 "%s (%s) %s %s already assigned %d\n",
1395                                 mci->pdev->dev.bus_id,
1396                                 pci_name(mci->pdev), mci->mod_name,
1397                                 mci->ctl_name, mci->mc_idx);
1398                         return 1;
1399                 }
1400
1401                 insert_before = NULL;
1402                 i = 0;
1403
1404                 list_for_each(item, &mc_devices) {
1405                         p = list_entry(item, struct mem_ctl_info, link);
1406
1407                         if (p->mc_idx != i) {
1408                                 insert_before = item;
1409                                 break;
1410                         }
1411
1412                         i++;
1413                 }
1414
1415                 mci->mc_idx = i;
1416
1417                 if (insert_before == NULL)
1418                         insert_before = &mc_devices;
1419         }
1420
1421         list_add_tail_rcu(&mci->link, insert_before);
1422         return 0;
1423 }
1424
1425 static void complete_mc_list_del(struct rcu_head *head)
1426 {
1427         struct mem_ctl_info *mci;
1428
1429         mci = container_of(head, struct mem_ctl_info, rcu);
1430         INIT_LIST_HEAD(&mci->link);
1431         complete(&mci->complete);
1432 }
1433
1434 static void del_mc_from_global_list(struct mem_ctl_info *mci)
1435 {
1436         list_del_rcu(&mci->link);
1437         init_completion(&mci->complete);
1438         call_rcu(&mci->rcu, complete_mc_list_del);
1439         wait_for_completion(&mci->complete);
1440 }
1441
1442 /**
1443  * edac_mc_add_mc: Insert the 'mci' structure into the mci global list and
1444  *                 create sysfs entries associated with mci structure
1445  * @mci: pointer to the mci structure to be added to the list
1446  *
1447  * Return:
1448  *      0       Success
1449  *      !0      Failure
1450  */
1451
1452 /* FIXME - should a warning be printed if no error detection? correction? */
1453 int edac_mc_add_mc(struct mem_ctl_info *mci)
1454 {
1455         debugf0("%s()\n", __func__);
1456 #ifdef CONFIG_EDAC_DEBUG
1457         if (edac_debug_level >= 3)
1458                 edac_mc_dump_mci(mci);
1459
1460         if (edac_debug_level >= 4) {
1461                 int i;
1462
1463                 for (i = 0; i < mci->nr_csrows; i++) {
1464                         int j;
1465
1466                         edac_mc_dump_csrow(&mci->csrows[i]);
1467                         for (j = 0; j < mci->csrows[i].nr_channels; j++)
1468                                 edac_mc_dump_channel(
1469                                         &mci->csrows[i].channels[j]);
1470                 }
1471         }
1472 #endif
1473         down(&mem_ctls_mutex);
1474
1475         if (add_mc_to_global_list(mci))
1476                 goto fail0;
1477
1478         /* set load time so that error rate can be tracked */
1479         mci->start_time = jiffies;
1480
1481         if (edac_create_sysfs_mci_device(mci)) {
1482                 edac_mc_printk(mci, KERN_WARNING,
1483                         "failed to create sysfs device\n");
1484                 goto fail1;
1485         }
1486
1487         /* Report action taken */
1488         edac_mc_printk(mci, KERN_INFO, "Giving out device to %s %s: PCI %s\n",
1489                 mci->mod_name, mci->ctl_name, pci_name(mci->pdev));
1490
1491         up(&mem_ctls_mutex);
1492         return 0;
1493
1494 fail1:
1495         del_mc_from_global_list(mci);
1496
1497 fail0:
1498         up(&mem_ctls_mutex);
1499         return 1;
1500 }
1501 EXPORT_SYMBOL_GPL(edac_mc_add_mc);
1502
1503 /**
1504  * edac_mc_del_mc: Remove sysfs entries for specified mci structure and
1505  *                 remove mci structure from global list
1506  * @pdev: Pointer to 'struct pci_dev' representing mci structure to remove.
1507  *
1508  * Return pointer to removed mci structure, or NULL if device not found.
1509  */
1510 struct mem_ctl_info * edac_mc_del_mc(struct pci_dev *pdev)
1511 {
1512         struct mem_ctl_info *mci;
1513
1514         debugf0("MC: %s()\n", __func__);
1515         down(&mem_ctls_mutex);
1516
1517         if ((mci = find_mci_by_pdev(pdev)) == NULL) {
1518                 up(&mem_ctls_mutex);
1519                 return NULL;
1520         }
1521
1522         edac_remove_sysfs_mci_device(mci);
1523         del_mc_from_global_list(mci);
1524         up(&mem_ctls_mutex);
1525         edac_printk(KERN_INFO, EDAC_MC,
1526                 "Removed device %d for %s %s: PCI %s\n", mci->mc_idx,
1527                 mci->mod_name, mci->ctl_name, pci_name(mci->pdev));
1528         return mci;
1529 }
1530 EXPORT_SYMBOL_GPL(edac_mc_del_mc);
1531
1532 void edac_mc_scrub_block(unsigned long page, unsigned long offset, u32 size)
1533 {
1534         struct page *pg;
1535         void *virt_addr;
1536         unsigned long flags = 0;
1537
1538         debugf3("%s()\n", __func__);
1539
1540         /* ECC error page was not in our memory. Ignore it. */
1541         if(!pfn_valid(page))
1542                 return;
1543
1544         /* Find the actual page structure then map it and fix */
1545         pg = pfn_to_page(page);
1546
1547         if (PageHighMem(pg))
1548                 local_irq_save(flags);
1549
1550         virt_addr = kmap_atomic(pg, KM_BOUNCE_READ);
1551
1552         /* Perform architecture specific atomic scrub operation */
1553         atomic_scrub(virt_addr + offset, size);
1554
1555         /* Unmap and complete */
1556         kunmap_atomic(virt_addr, KM_BOUNCE_READ);
1557
1558         if (PageHighMem(pg))
1559                 local_irq_restore(flags);
1560 }
1561 EXPORT_SYMBOL_GPL(edac_mc_scrub_block);
1562
1563 /* FIXME - should return -1 */
1564 int edac_mc_find_csrow_by_page(struct mem_ctl_info *mci, unsigned long page)
1565 {
1566         struct csrow_info *csrows = mci->csrows;
1567         int row, i;
1568
1569         debugf1("MC%d: %s(): 0x%lx\n", mci->mc_idx, __func__, page);
1570         row = -1;
1571
1572         for (i = 0; i < mci->nr_csrows; i++) {
1573                 struct csrow_info *csrow = &csrows[i];
1574
1575                 if (csrow->nr_pages == 0)
1576                         continue;
1577
1578                 debugf3("MC%d: %s(): first(0x%lx) page(0x%lx) last(0x%lx) "
1579                         "mask(0x%lx)\n", mci->mc_idx, __func__,
1580                         csrow->first_page, page, csrow->last_page,
1581                         csrow->page_mask);
1582
1583                 if ((page >= csrow->first_page) &&
1584                     (page <= csrow->last_page) &&
1585                     ((page & csrow->page_mask) ==
1586                      (csrow->first_page & csrow->page_mask))) {
1587                         row = i;
1588                         break;
1589                 }
1590         }
1591
1592         if (row == -1)
1593                 edac_mc_printk(mci, KERN_ERR,
1594                         "could not look up page error address %lx\n",
1595                         (unsigned long) page);
1596
1597         return row;
1598 }
1599 EXPORT_SYMBOL_GPL(edac_mc_find_csrow_by_page);
1600
1601 /* FIXME - setable log (warning/emerg) levels */
1602 /* FIXME - integrate with evlog: http://evlog.sourceforge.net/ */
1603 void edac_mc_handle_ce(struct mem_ctl_info *mci,
1604                 unsigned long page_frame_number, unsigned long offset_in_page,
1605                 unsigned long syndrome, int row, int channel, const char *msg)
1606 {
1607         unsigned long remapped_page;
1608
1609         debugf3("MC%d: %s()\n", mci->mc_idx, __func__);
1610
1611         /* FIXME - maybe make panic on INTERNAL ERROR an option */
1612         if (row >= mci->nr_csrows || row < 0) {
1613                 /* something is wrong */
1614                 edac_mc_printk(mci, KERN_ERR,
1615                         "INTERNAL ERROR: row out of range "
1616                         "(%d >= %d)\n", row, mci->nr_csrows);
1617                 edac_mc_handle_ce_no_info(mci, "INTERNAL ERROR");
1618                 return;
1619         }
1620
1621         if (channel >= mci->csrows[row].nr_channels || channel < 0) {
1622                 /* something is wrong */
1623                 edac_mc_printk(mci, KERN_ERR,
1624                         "INTERNAL ERROR: channel out of range "
1625                         "(%d >= %d)\n", channel,
1626                         mci->csrows[row].nr_channels);
1627                 edac_mc_handle_ce_no_info(mci, "INTERNAL ERROR");
1628                 return;
1629         }
1630
1631         if (log_ce)
1632                 /* FIXME - put in DIMM location */
1633                 edac_mc_printk(mci, KERN_WARNING,
1634                         "CE page 0x%lx, offset 0x%lx, grain %d, syndrome "
1635                         "0x%lx, row %d, channel %d, label \"%s\": %s\n",
1636                         page_frame_number, offset_in_page,
1637                         mci->csrows[row].grain, syndrome, row, channel,
1638                         mci->csrows[row].channels[channel].label, msg);
1639
1640         mci->ce_count++;
1641         mci->csrows[row].ce_count++;
1642         mci->csrows[row].channels[channel].ce_count++;
1643
1644         if (mci->scrub_mode & SCRUB_SW_SRC) {
1645                 /*
1646                  * Some MC's can remap memory so that it is still available
1647                  * at a different address when PCI devices map into memory.
1648                  * MC's that can't do this lose the memory where PCI devices
1649                  * are mapped.  This mapping is MC dependant and so we call
1650                  * back into the MC driver for it to map the MC page to
1651                  * a physical (CPU) page which can then be mapped to a virtual
1652                  * page - which can then be scrubbed.
1653                  */
1654                 remapped_page = mci->ctl_page_to_phys ?
1655                     mci->ctl_page_to_phys(mci, page_frame_number) :
1656                     page_frame_number;
1657
1658                 edac_mc_scrub_block(remapped_page, offset_in_page,
1659                                         mci->csrows[row].grain);
1660         }
1661 }
1662 EXPORT_SYMBOL_GPL(edac_mc_handle_ce);
1663
1664 void edac_mc_handle_ce_no_info(struct mem_ctl_info *mci, const char *msg)
1665 {
1666         if (log_ce)
1667                 edac_mc_printk(mci, KERN_WARNING,
1668                         "CE - no information available: %s\n", msg);
1669
1670         mci->ce_noinfo_count++;
1671         mci->ce_count++;
1672 }
1673 EXPORT_SYMBOL_GPL(edac_mc_handle_ce_no_info);
1674
1675 void edac_mc_handle_ue(struct mem_ctl_info *mci,
1676                 unsigned long page_frame_number, unsigned long offset_in_page,
1677                 int row, const char *msg)
1678 {
1679         int len = EDAC_MC_LABEL_LEN * 4;
1680         char labels[len + 1];
1681         char *pos = labels;
1682         int chan;
1683         int chars;
1684
1685         debugf3("MC%d: %s()\n", mci->mc_idx, __func__);
1686
1687         /* FIXME - maybe make panic on INTERNAL ERROR an option */
1688         if (row >= mci->nr_csrows || row < 0) {
1689                 /* something is wrong */
1690                 edac_mc_printk(mci, KERN_ERR,
1691                         "INTERNAL ERROR: row out of range "
1692                         "(%d >= %d)\n", row, mci->nr_csrows);
1693                 edac_mc_handle_ue_no_info(mci, "INTERNAL ERROR");
1694                 return;
1695         }
1696
1697         chars = snprintf(pos, len + 1, "%s",
1698                         mci->csrows[row].channels[0].label);
1699         len -= chars;
1700         pos += chars;
1701
1702         for (chan = 1; (chan < mci->csrows[row].nr_channels) && (len > 0);
1703              chan++) {
1704                 chars = snprintf(pos, len + 1, ":%s",
1705                                 mci->csrows[row].channels[chan].label);
1706                 len -= chars;
1707                 pos += chars;
1708         }
1709
1710         if (log_ue)
1711                 edac_mc_printk(mci, KERN_EMERG,
1712                         "UE page 0x%lx, offset 0x%lx, grain %d, row %d, "
1713                         "labels \"%s\": %s\n", page_frame_number,
1714                         offset_in_page, mci->csrows[row].grain, row, labels,
1715                         msg);
1716
1717         if (panic_on_ue)
1718                 panic("EDAC MC%d: UE page 0x%lx, offset 0x%lx, grain %d, "
1719                         "row %d, labels \"%s\": %s\n", mci->mc_idx,
1720                         page_frame_number, offset_in_page,
1721                         mci->csrows[row].grain, row, labels, msg);
1722
1723         mci->ue_count++;
1724         mci->csrows[row].ue_count++;
1725 }
1726 EXPORT_SYMBOL_GPL(edac_mc_handle_ue);
1727
1728 void edac_mc_handle_ue_no_info(struct mem_ctl_info *mci, const char *msg)
1729 {
1730         if (panic_on_ue)
1731                 panic("EDAC MC%d: Uncorrected Error", mci->mc_idx);
1732
1733         if (log_ue)
1734                 edac_mc_printk(mci, KERN_WARNING,
1735                         "UE - no information available: %s\n", msg);
1736         mci->ue_noinfo_count++;
1737         mci->ue_count++;
1738 }
1739 EXPORT_SYMBOL_GPL(edac_mc_handle_ue_no_info);
1740
1741 #ifdef CONFIG_PCI
1742
1743 static u16 get_pci_parity_status(struct pci_dev *dev, int secondary)
1744 {
1745         int where;
1746         u16 status;
1747
1748         where = secondary ? PCI_SEC_STATUS : PCI_STATUS;
1749         pci_read_config_word(dev, where, &status);
1750
1751         /* If we get back 0xFFFF then we must suspect that the card has been
1752          * pulled but the Linux PCI layer has not yet finished cleaning up.
1753          * We don't want to report on such devices
1754          */
1755
1756         if (status == 0xFFFF) {
1757                 u32 sanity;
1758
1759                 pci_read_config_dword(dev, 0, &sanity);
1760
1761                 if (sanity == 0xFFFFFFFF)
1762                         return 0;
1763         }
1764
1765         status &= PCI_STATUS_DETECTED_PARITY | PCI_STATUS_SIG_SYSTEM_ERROR |
1766                 PCI_STATUS_PARITY;
1767
1768         if (status)
1769                 /* reset only the bits we are interested in */
1770                 pci_write_config_word(dev, where, status);
1771
1772         return status;
1773 }
1774
1775 typedef void (*pci_parity_check_fn_t) (struct pci_dev *dev);
1776
1777 /* Clear any PCI parity errors logged by this device. */
1778 static void edac_pci_dev_parity_clear(struct pci_dev *dev)
1779 {
1780         u8 header_type;
1781
1782         get_pci_parity_status(dev, 0);
1783
1784         /* read the device TYPE, looking for bridges */
1785         pci_read_config_byte(dev, PCI_HEADER_TYPE, &header_type);
1786
1787         if ((header_type & 0x7F) == PCI_HEADER_TYPE_BRIDGE)
1788                 get_pci_parity_status(dev, 1);
1789 }
1790
1791 /*
1792  *  PCI Parity polling
1793  *
1794  */
1795 static void edac_pci_dev_parity_test(struct pci_dev *dev)
1796 {
1797         u16 status;
1798         u8  header_type;
1799
1800         /* read the STATUS register on this device
1801          */
1802         status = get_pci_parity_status(dev, 0);
1803
1804         debugf2("PCI STATUS= 0x%04x %s\n", status, dev->dev.bus_id );
1805
1806         /* check the status reg for errors */
1807         if (status) {
1808                 if (status & (PCI_STATUS_SIG_SYSTEM_ERROR))
1809                         edac_printk(KERN_CRIT, EDAC_PCI,
1810                                 "Signaled System Error on %s\n",
1811                                 pci_name(dev));
1812
1813                 if (status & (PCI_STATUS_PARITY)) {
1814                         edac_printk(KERN_CRIT, EDAC_PCI,
1815                                 "Master Data Parity Error on %s\n",
1816                                 pci_name(dev));
1817
1818                         atomic_inc(&pci_parity_count);
1819                 }
1820
1821                 if (status & (PCI_STATUS_DETECTED_PARITY)) {
1822                         edac_printk(KERN_CRIT, EDAC_PCI,
1823                                 "Detected Parity Error on %s\n",
1824                                 pci_name(dev));
1825
1826                         atomic_inc(&pci_parity_count);
1827                 }
1828         }
1829
1830         /* read the device TYPE, looking for bridges */
1831         pci_read_config_byte(dev, PCI_HEADER_TYPE, &header_type);
1832
1833         debugf2("PCI HEADER TYPE= 0x%02x %s\n", header_type, dev->dev.bus_id );
1834
1835         if ((header_type & 0x7F) == PCI_HEADER_TYPE_BRIDGE) {
1836                 /* On bridges, need to examine secondary status register  */
1837                 status = get_pci_parity_status(dev, 1);
1838
1839                 debugf2("PCI SEC_STATUS= 0x%04x %s\n",
1840                                 status, dev->dev.bus_id );
1841
1842                 /* check the secondary status reg for errors */
1843                 if (status) {
1844                         if (status & (PCI_STATUS_SIG_SYSTEM_ERROR))
1845                                 edac_printk(KERN_CRIT, EDAC_PCI, "Bridge "
1846                                         "Signaled System Error on %s\n",
1847                                         pci_name(dev));
1848
1849                         if (status & (PCI_STATUS_PARITY)) {
1850                                 edac_printk(KERN_CRIT, EDAC_PCI, "Bridge "
1851                                         "Master Data Parity Error on "
1852                                         "%s\n", pci_name(dev));
1853
1854                                 atomic_inc(&pci_parity_count);
1855                         }
1856
1857                         if (status & (PCI_STATUS_DETECTED_PARITY)) {
1858                                 edac_printk(KERN_CRIT, EDAC_PCI, "Bridge "
1859                                         "Detected Parity Error on %s\n",
1860                                         pci_name(dev));
1861
1862                                 atomic_inc(&pci_parity_count);
1863                         }
1864                 }
1865         }
1866 }
1867
1868 /*
1869  * check_dev_on_list: Scan for a PCI device on a white/black list
1870  * @list:       an EDAC  &edac_pci_device_list  white/black list pointer
1871  * @free_index: index of next free entry on the list
1872  * @pci_dev:    PCI Device pointer
1873  *
1874  * see if list contains the device.
1875  *
1876  * Returns:     0 not found
1877  *              1 found on list
1878  */
1879 static int check_dev_on_list(struct edac_pci_device_list *list,
1880                 int free_index, struct pci_dev *dev)
1881 {
1882         int i;
1883         int rc = 0;     /* Assume not found */
1884         unsigned short vendor=dev->vendor;
1885         unsigned short device=dev->device;
1886
1887         /* Scan the list, looking for a vendor/device match */
1888         for (i = 0; i < free_index; i++, list++ ) {
1889                 if ((list->vendor == vendor ) && (list->device == device )) {
1890                         rc = 1;
1891                         break;
1892                 }
1893         }
1894
1895         return rc;
1896 }
1897
1898 /*
1899  * pci_dev parity list iterator
1900  *      Scan the PCI device list for one iteration, looking for SERRORs
1901  *      Master Parity ERRORS or Parity ERRORs on primary or secondary devices
1902  */
1903 static inline void edac_pci_dev_parity_iterator(pci_parity_check_fn_t fn)
1904 {
1905         struct pci_dev *dev = NULL;
1906
1907         /* request for kernel access to the next PCI device, if any,
1908          * and while we are looking at it have its reference count
1909          * bumped until we are done with it
1910          */
1911         while((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {
1912                 /* if whitelist exists then it has priority, so only scan
1913                  * those devices on the whitelist
1914                  */
1915                 if (pci_whitelist_count > 0 ) {
1916                         if (check_dev_on_list(pci_whitelist,
1917                                         pci_whitelist_count, dev))
1918                                 fn(dev);
1919                 } else {
1920                         /*
1921                          * if no whitelist, then check if this devices is
1922                          * blacklisted
1923                          */
1924                         if (!check_dev_on_list(pci_blacklist,
1925                                         pci_blacklist_count, dev))
1926                                 fn(dev);
1927                 }
1928         }
1929 }
1930
1931 static void do_pci_parity_check(void)
1932 {
1933         unsigned long flags;
1934         int before_count;
1935
1936         debugf3("%s()\n", __func__);
1937
1938         if (!check_pci_parity)
1939                 return;
1940
1941         before_count = atomic_read(&pci_parity_count);
1942
1943         /* scan all PCI devices looking for a Parity Error on devices and
1944          * bridges
1945          */
1946         local_irq_save(flags);
1947         edac_pci_dev_parity_iterator(edac_pci_dev_parity_test);
1948         local_irq_restore(flags);
1949
1950         /* Only if operator has selected panic on PCI Error */
1951         if (panic_on_pci_parity) {
1952                 /* If the count is different 'after' from 'before' */
1953                 if (before_count != atomic_read(&pci_parity_count))
1954                         panic("EDAC: PCI Parity Error");
1955         }
1956 }
1957
1958 static inline void clear_pci_parity_errors(void)
1959 {
1960         /* Clear any PCI bus parity errors that devices initially have logged
1961          * in their registers.
1962          */
1963         edac_pci_dev_parity_iterator(edac_pci_dev_parity_clear);
1964 }
1965
1966 #else  /* CONFIG_PCI */
1967
1968 static inline void do_pci_parity_check(void)
1969 {
1970         /* no-op */
1971 }
1972
1973 static inline void clear_pci_parity_errors(void)
1974 {
1975         /* no-op */
1976 }
1977
1978 #endif  /* CONFIG_PCI */
1979
1980 /*
1981  * Iterate over all MC instances and check for ECC, et al, errors
1982  */
1983 static inline void check_mc_devices(void)
1984 {
1985         struct list_head *item;
1986         struct mem_ctl_info *mci;
1987
1988         debugf3("%s()\n", __func__);
1989         down(&mem_ctls_mutex);
1990
1991         list_for_each(item, &mc_devices) {
1992                 mci = list_entry(item, struct mem_ctl_info, link);
1993
1994                 if (mci->edac_check != NULL)
1995                         mci->edac_check(mci);
1996         }
1997
1998         up(&mem_ctls_mutex);
1999 }
2000
2001 /*
2002  * Check MC status every poll_msec.
2003  * Check PCI status every poll_msec as well.
2004  *
2005  * This where the work gets done for edac.
2006  *
2007  * SMP safe, doesn't use NMI, and auto-rate-limits.
2008  */
2009 static void do_edac_check(void)
2010 {
2011         debugf3("%s()\n", __func__);
2012         check_mc_devices();
2013         do_pci_parity_check();
2014 }
2015
2016 static int edac_kernel_thread(void *arg)
2017 {
2018         while (!kthread_should_stop()) {
2019                 do_edac_check();
2020
2021                 /* goto sleep for the interval */
2022                 schedule_timeout_interruptible((HZ * poll_msec) / 1000);
2023                 try_to_freeze();
2024         }
2025
2026         return 0;
2027 }
2028
2029 /*
2030  * edac_mc_init
2031  *      module initialization entry point
2032  */
2033 static int __init edac_mc_init(void)
2034 {
2035         edac_printk(KERN_INFO, EDAC_MC, EDAC_MC_VERSION "\n");
2036
2037         /*
2038          * Harvest and clear any boot/initialization PCI parity errors
2039          *
2040          * FIXME: This only clears errors logged by devices present at time of
2041          *      module initialization.  We should also do an initial clear
2042          *      of each newly hotplugged device.
2043          */
2044         clear_pci_parity_errors();
2045
2046         /* Create the MC sysfs entries */
2047         if (edac_sysfs_memctrl_setup()) {
2048                 edac_printk(KERN_ERR, EDAC_MC,
2049                         "Error initializing sysfs code\n");
2050                 return -ENODEV;
2051         }
2052
2053         /* Create the PCI parity sysfs entries */
2054         if (edac_sysfs_pci_setup()) {
2055                 edac_sysfs_memctrl_teardown();
2056                 edac_printk(KERN_ERR, EDAC_MC,
2057                         "EDAC PCI: Error initializing sysfs code\n");
2058                 return -ENODEV;
2059         }
2060
2061         /* create our kernel thread */
2062         edac_thread = kthread_run(edac_kernel_thread, NULL, "kedac");
2063
2064         if (IS_ERR(edac_thread)) {
2065                 /* remove the sysfs entries */
2066                 edac_sysfs_memctrl_teardown();
2067                 edac_sysfs_pci_teardown();
2068                 return PTR_ERR(edac_thread);
2069         }
2070
2071         return 0;
2072 }
2073
2074 /*
2075  * edac_mc_exit()
2076  *      module exit/termination functioni
2077  */
2078 static void __exit edac_mc_exit(void)
2079 {
2080         debugf0("%s()\n", __func__);
2081         kthread_stop(edac_thread);
2082
2083         /* tear down the sysfs device */
2084         edac_sysfs_memctrl_teardown();
2085         edac_sysfs_pci_teardown();
2086 }
2087
2088 module_init(edac_mc_init);
2089 module_exit(edac_mc_exit);
2090
2091 MODULE_LICENSE("GPL");
2092 MODULE_AUTHOR("Linux Networx (http://lnxi.com) Thayne Harbaugh et al\n"
2093         "Based on work by Dan Hollis et al");
2094 MODULE_DESCRIPTION("Core library routines for MC reporting");
2095
2096 module_param(panic_on_ue, int, 0644);
2097 MODULE_PARM_DESC(panic_on_ue, "Panic on uncorrected error: 0=off 1=on");
2098 module_param(check_pci_parity, int, 0644);
2099 MODULE_PARM_DESC(check_pci_parity, "Check for PCI bus parity errors: 0=off 1=on");
2100 module_param(panic_on_pci_parity, int, 0644);
2101 MODULE_PARM_DESC(panic_on_pci_parity, "Panic on PCI Bus Parity error: 0=off 1=on");
2102 module_param(log_ue, int, 0644);
2103 MODULE_PARM_DESC(log_ue, "Log uncorrectable error to console: 0=off 1=on");
2104 module_param(log_ce, int, 0644);
2105 MODULE_PARM_DESC(log_ce, "Log correctable error to console: 0=off 1=on");
2106 module_param(poll_msec, int, 0644);
2107 MODULE_PARM_DESC(poll_msec, "Polling period in milliseconds");
2108 #ifdef CONFIG_EDAC_DEBUG
2109 module_param(edac_debug_level, int, 0644);
2110 MODULE_PARM_DESC(edac_debug_level, "Debug level");
2111 #endif