Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/teigland/dlm
[linux-2.6] / arch / x86 / kernel / cpu / mcheck / mce_amd_64.c
1 /*
2  *  (c) 2005, 2006 Advanced Micro Devices, Inc.
3  *  Your use of this code is subject to the terms and conditions of the
4  *  GNU general public license version 2. See "COPYING" or
5  *  http://www.gnu.org/licenses/gpl.html
6  *
7  *  Written by Jacob Shin - AMD, Inc.
8  *
9  *  Support : jacob.shin@amd.com
10  *
11  *  April 2006
12  *     - added support for AMD Family 0x10 processors
13  *
14  *  All MC4_MISCi registers are shared between multi-cores
15  */
16
17 #include <linux/cpu.h>
18 #include <linux/errno.h>
19 #include <linux/init.h>
20 #include <linux/interrupt.h>
21 #include <linux/kobject.h>
22 #include <linux/notifier.h>
23 #include <linux/sched.h>
24 #include <linux/smp.h>
25 #include <linux/sysdev.h>
26 #include <linux/sysfs.h>
27 #include <asm/apic.h>
28 #include <asm/mce.h>
29 #include <asm/msr.h>
30 #include <asm/percpu.h>
31 #include <asm/idle.h>
32
33 #define PFX               "mce_threshold: "
34 #define VERSION           "version 1.1.1"
35 #define NR_BANKS          6
36 #define NR_BLOCKS         9
37 #define THRESHOLD_MAX     0xFFF
38 #define INT_TYPE_APIC     0x00020000
39 #define MASK_VALID_HI     0x80000000
40 #define MASK_CNTP_HI      0x40000000
41 #define MASK_LOCKED_HI    0x20000000
42 #define MASK_LVTOFF_HI    0x00F00000
43 #define MASK_COUNT_EN_HI  0x00080000
44 #define MASK_INT_TYPE_HI  0x00060000
45 #define MASK_OVERFLOW_HI  0x00010000
46 #define MASK_ERR_COUNT_HI 0x00000FFF
47 #define MASK_BLKPTR_LO    0xFF000000
48 #define MCG_XBLK_ADDR     0xC0000400
49
50 struct threshold_block {
51         unsigned int block;
52         unsigned int bank;
53         unsigned int cpu;
54         u32 address;
55         u16 interrupt_enable;
56         u16 threshold_limit;
57         struct kobject kobj;
58         struct list_head miscj;
59 };
60
61 /* defaults used early on boot */
62 static struct threshold_block threshold_defaults = {
63         .interrupt_enable = 0,
64         .threshold_limit = THRESHOLD_MAX,
65 };
66
67 struct threshold_bank {
68         struct kobject *kobj;
69         struct threshold_block *blocks;
70         cpumask_t cpus;
71 };
72 static DEFINE_PER_CPU(struct threshold_bank *, threshold_banks[NR_BANKS]);
73
74 #ifdef CONFIG_SMP
75 static unsigned char shared_bank[NR_BANKS] = {
76         0, 0, 0, 0, 1
77 };
78 #endif
79
80 static DEFINE_PER_CPU(unsigned char, bank_map); /* see which banks are on */
81
82 /*
83  * CPU Initialization
84  */
85
86 struct thresh_restart {
87         struct threshold_block *b;
88         int reset;
89         u16 old_limit;
90 };
91
92 /* must be called with correct cpu affinity */
93 static long threshold_restart_bank(void *_tr)
94 {
95         struct thresh_restart *tr = _tr;
96         u32 mci_misc_hi, mci_misc_lo;
97
98         rdmsr(tr->b->address, mci_misc_lo, mci_misc_hi);
99
100         if (tr->b->threshold_limit < (mci_misc_hi & THRESHOLD_MAX))
101                 tr->reset = 1;  /* limit cannot be lower than err count */
102
103         if (tr->reset) {                /* reset err count and overflow bit */
104                 mci_misc_hi =
105                     (mci_misc_hi & ~(MASK_ERR_COUNT_HI | MASK_OVERFLOW_HI)) |
106                     (THRESHOLD_MAX - tr->b->threshold_limit);
107         } else if (tr->old_limit) {     /* change limit w/o reset */
108                 int new_count = (mci_misc_hi & THRESHOLD_MAX) +
109                     (tr->old_limit - tr->b->threshold_limit);
110                 mci_misc_hi = (mci_misc_hi & ~MASK_ERR_COUNT_HI) |
111                     (new_count & THRESHOLD_MAX);
112         }
113
114         tr->b->interrupt_enable ?
115             (mci_misc_hi = (mci_misc_hi & ~MASK_INT_TYPE_HI) | INT_TYPE_APIC) :
116             (mci_misc_hi &= ~MASK_INT_TYPE_HI);
117
118         mci_misc_hi |= MASK_COUNT_EN_HI;
119         wrmsr(tr->b->address, mci_misc_lo, mci_misc_hi);
120         return 0;
121 }
122
123 /* cpu init entry point, called from mce.c with preempt off */
124 void __cpuinit mce_amd_feature_init(struct cpuinfo_x86 *c)
125 {
126         unsigned int bank, block;
127         unsigned int cpu = smp_processor_id();
128         u8 lvt_off;
129         u32 low = 0, high = 0, address = 0;
130         struct thresh_restart tr;
131
132         for (bank = 0; bank < NR_BANKS; ++bank) {
133                 for (block = 0; block < NR_BLOCKS; ++block) {
134                         if (block == 0)
135                                 address = MSR_IA32_MC0_MISC + bank * 4;
136                         else if (block == 1) {
137                                 address = (low & MASK_BLKPTR_LO) >> 21;
138                                 if (!address)
139                                         break;
140                                 address += MCG_XBLK_ADDR;
141                         }
142                         else
143                                 ++address;
144
145                         if (rdmsr_safe(address, &low, &high))
146                                 break;
147
148                         if (!(high & MASK_VALID_HI)) {
149                                 if (block)
150                                         continue;
151                                 else
152                                         break;
153                         }
154
155                         if (!(high & MASK_CNTP_HI)  ||
156                              (high & MASK_LOCKED_HI))
157                                 continue;
158
159                         if (!block)
160                                 per_cpu(bank_map, cpu) |= (1 << bank);
161 #ifdef CONFIG_SMP
162                         if (shared_bank[bank] && c->cpu_core_id)
163                                 break;
164 #endif
165                         lvt_off = setup_APIC_eilvt_mce(THRESHOLD_APIC_VECTOR,
166                                                        APIC_EILVT_MSG_FIX, 0);
167
168                         high &= ~MASK_LVTOFF_HI;
169                         high |= lvt_off << 20;
170                         wrmsr(address, low, high);
171
172                         threshold_defaults.address = address;
173                         tr.b = &threshold_defaults;
174                         tr.reset = 0;
175                         tr.old_limit = 0;
176                         threshold_restart_bank(&tr);
177                 }
178         }
179 }
180
181 /*
182  * APIC Interrupt Handler
183  */
184
185 /*
186  * threshold interrupt handler will service THRESHOLD_APIC_VECTOR.
187  * the interrupt goes off when error_count reaches threshold_limit.
188  * the handler will simply log mcelog w/ software defined bank number.
189  */
190 asmlinkage void mce_threshold_interrupt(void)
191 {
192         unsigned int bank, block;
193         struct mce m;
194         u32 low = 0, high = 0, address = 0;
195
196         ack_APIC_irq();
197         exit_idle();
198         irq_enter();
199
200         memset(&m, 0, sizeof(m));
201         rdtscll(m.tsc);
202         m.cpu = smp_processor_id();
203
204         /* assume first bank caused it */
205         for (bank = 0; bank < NR_BANKS; ++bank) {
206                 if (!(per_cpu(bank_map, m.cpu) & (1 << bank)))
207                         continue;
208                 for (block = 0; block < NR_BLOCKS; ++block) {
209                         if (block == 0)
210                                 address = MSR_IA32_MC0_MISC + bank * 4;
211                         else if (block == 1) {
212                                 address = (low & MASK_BLKPTR_LO) >> 21;
213                                 if (!address)
214                                         break;
215                                 address += MCG_XBLK_ADDR;
216                         }
217                         else
218                                 ++address;
219
220                         if (rdmsr_safe(address, &low, &high))
221                                 break;
222
223                         if (!(high & MASK_VALID_HI)) {
224                                 if (block)
225                                         continue;
226                                 else
227                                         break;
228                         }
229
230                         if (!(high & MASK_CNTP_HI)  ||
231                              (high & MASK_LOCKED_HI))
232                                 continue;
233
234                         /* Log the machine check that caused the threshold
235                            event. */
236                         do_machine_check(NULL, 0);
237
238                         if (high & MASK_OVERFLOW_HI) {
239                                 rdmsrl(address, m.misc);
240                                 rdmsrl(MSR_IA32_MC0_STATUS + bank * 4,
241                                        m.status);
242                                 m.bank = K8_MCE_THRESHOLD_BASE
243                                        + bank * NR_BLOCKS
244                                        + block;
245                                 mce_log(&m);
246                                 goto out;
247                         }
248                 }
249         }
250 out:
251         inc_irq_stat(irq_threshold_count);
252         irq_exit();
253 }
254
255 /*
256  * Sysfs Interface
257  */
258
259 struct threshold_attr {
260         struct attribute attr;
261         ssize_t(*show) (struct threshold_block *, char *);
262         ssize_t(*store) (struct threshold_block *, const char *, size_t count);
263 };
264
265 #define SHOW_FIELDS(name)                                           \
266 static ssize_t show_ ## name(struct threshold_block * b, char *buf) \
267 {                                                                   \
268         return sprintf(buf, "%lx\n", (unsigned long) b->name);      \
269 }
270 SHOW_FIELDS(interrupt_enable)
271 SHOW_FIELDS(threshold_limit)
272
273 static ssize_t store_interrupt_enable(struct threshold_block *b,
274                                       const char *buf, size_t count)
275 {
276         char *end;
277         struct thresh_restart tr;
278         unsigned long new = simple_strtoul(buf, &end, 0);
279         if (end == buf)
280                 return -EINVAL;
281         b->interrupt_enable = !!new;
282
283         tr.b = b;
284         tr.reset = 0;
285         tr.old_limit = 0;
286         work_on_cpu(b->cpu, threshold_restart_bank, &tr);
287
288         return end - buf;
289 }
290
291 static ssize_t store_threshold_limit(struct threshold_block *b,
292                                      const char *buf, size_t count)
293 {
294         char *end;
295         struct thresh_restart tr;
296         unsigned long new = simple_strtoul(buf, &end, 0);
297         if (end == buf)
298                 return -EINVAL;
299         if (new > THRESHOLD_MAX)
300                 new = THRESHOLD_MAX;
301         if (new < 1)
302                 new = 1;
303         tr.old_limit = b->threshold_limit;
304         b->threshold_limit = new;
305         tr.b = b;
306         tr.reset = 0;
307
308         work_on_cpu(b->cpu, threshold_restart_bank, &tr);
309
310         return end - buf;
311 }
312
313 static long local_error_count(void *_b)
314 {
315         struct threshold_block *b = _b;
316         u32 low, high;
317
318         rdmsr(b->address, low, high);
319         return (high & 0xFFF) - (THRESHOLD_MAX - b->threshold_limit);
320 }
321
322 static ssize_t show_error_count(struct threshold_block *b, char *buf)
323 {
324         return sprintf(buf, "%lx\n", work_on_cpu(b->cpu, local_error_count, b));
325 }
326
327 static ssize_t store_error_count(struct threshold_block *b,
328                                  const char *buf, size_t count)
329 {
330         struct thresh_restart tr = { .b = b, .reset = 1, .old_limit = 0 };
331
332         work_on_cpu(b->cpu, threshold_restart_bank, &tr);
333         return 1;
334 }
335
336 #define THRESHOLD_ATTR(_name,_mode,_show,_store) {            \
337         .attr = {.name = __stringify(_name), .mode = _mode }, \
338         .show = _show,                                        \
339         .store = _store,                                      \
340 };
341
342 #define RW_ATTR(name)                                           \
343 static struct threshold_attr name =                             \
344         THRESHOLD_ATTR(name, 0644, show_## name, store_## name)
345
346 RW_ATTR(interrupt_enable);
347 RW_ATTR(threshold_limit);
348 RW_ATTR(error_count);
349
350 static struct attribute *default_attrs[] = {
351         &interrupt_enable.attr,
352         &threshold_limit.attr,
353         &error_count.attr,
354         NULL
355 };
356
357 #define to_block(k) container_of(k, struct threshold_block, kobj)
358 #define to_attr(a) container_of(a, struct threshold_attr, attr)
359
360 static ssize_t show(struct kobject *kobj, struct attribute *attr, char *buf)
361 {
362         struct threshold_block *b = to_block(kobj);
363         struct threshold_attr *a = to_attr(attr);
364         ssize_t ret;
365         ret = a->show ? a->show(b, buf) : -EIO;
366         return ret;
367 }
368
369 static ssize_t store(struct kobject *kobj, struct attribute *attr,
370                      const char *buf, size_t count)
371 {
372         struct threshold_block *b = to_block(kobj);
373         struct threshold_attr *a = to_attr(attr);
374         ssize_t ret;
375         ret = a->store ? a->store(b, buf, count) : -EIO;
376         return ret;
377 }
378
379 static struct sysfs_ops threshold_ops = {
380         .show = show,
381         .store = store,
382 };
383
384 static struct kobj_type threshold_ktype = {
385         .sysfs_ops = &threshold_ops,
386         .default_attrs = default_attrs,
387 };
388
389 static __cpuinit int allocate_threshold_blocks(unsigned int cpu,
390                                                unsigned int bank,
391                                                unsigned int block,
392                                                u32 address)
393 {
394         int err;
395         u32 low, high;
396         struct threshold_block *b = NULL;
397
398         if ((bank >= NR_BANKS) || (block >= NR_BLOCKS))
399                 return 0;
400
401         if (rdmsr_safe(address, &low, &high))
402                 return 0;
403
404         if (!(high & MASK_VALID_HI)) {
405                 if (block)
406                         goto recurse;
407                 else
408                         return 0;
409         }
410
411         if (!(high & MASK_CNTP_HI)  ||
412              (high & MASK_LOCKED_HI))
413                 goto recurse;
414
415         b = kzalloc(sizeof(struct threshold_block), GFP_KERNEL);
416         if (!b)
417                 return -ENOMEM;
418
419         b->block = block;
420         b->bank = bank;
421         b->cpu = cpu;
422         b->address = address;
423         b->interrupt_enable = 0;
424         b->threshold_limit = THRESHOLD_MAX;
425
426         INIT_LIST_HEAD(&b->miscj);
427
428         if (per_cpu(threshold_banks, cpu)[bank]->blocks)
429                 list_add(&b->miscj,
430                          &per_cpu(threshold_banks, cpu)[bank]->blocks->miscj);
431         else
432                 per_cpu(threshold_banks, cpu)[bank]->blocks = b;
433
434         err = kobject_init_and_add(&b->kobj, &threshold_ktype,
435                                    per_cpu(threshold_banks, cpu)[bank]->kobj,
436                                    "misc%i", block);
437         if (err)
438                 goto out_free;
439 recurse:
440         if (!block) {
441                 address = (low & MASK_BLKPTR_LO) >> 21;
442                 if (!address)
443                         return 0;
444                 address += MCG_XBLK_ADDR;
445         } else
446                 ++address;
447
448         err = allocate_threshold_blocks(cpu, bank, ++block, address);
449         if (err)
450                 goto out_free;
451
452         if (b)
453                 kobject_uevent(&b->kobj, KOBJ_ADD);
454
455         return err;
456
457 out_free:
458         if (b) {
459                 kobject_put(&b->kobj);
460                 kfree(b);
461         }
462         return err;
463 }
464
465 static __cpuinit long local_allocate_threshold_blocks(void *_bank)
466 {
467         unsigned int *bank = _bank;
468
469         return allocate_threshold_blocks(smp_processor_id(), *bank, 0,
470                                          MSR_IA32_MC0_MISC + *bank * 4);
471 }
472
473 /* symlinks sibling shared banks to first core.  first core owns dir/files. */
474 static __cpuinit int threshold_create_bank(unsigned int cpu, unsigned int bank)
475 {
476         int i, err = 0;
477         struct threshold_bank *b = NULL;
478         char name[32];
479
480         sprintf(name, "threshold_bank%i", bank);
481
482 #ifdef CONFIG_SMP
483         if (cpu_data(cpu).cpu_core_id && shared_bank[bank]) {   /* symlink */
484                 i = first_cpu(per_cpu(cpu_core_map, cpu));
485
486                 /* first core not up yet */
487                 if (cpu_data(i).cpu_core_id)
488                         goto out;
489
490                 /* already linked */
491                 if (per_cpu(threshold_banks, cpu)[bank])
492                         goto out;
493
494                 b = per_cpu(threshold_banks, i)[bank];
495
496                 if (!b)
497                         goto out;
498
499                 err = sysfs_create_link(&per_cpu(device_mce, cpu).kobj,
500                                         b->kobj, name);
501                 if (err)
502                         goto out;
503
504                 b->cpus = per_cpu(cpu_core_map, cpu);
505                 per_cpu(threshold_banks, cpu)[bank] = b;
506                 goto out;
507         }
508 #endif
509
510         b = kzalloc(sizeof(struct threshold_bank), GFP_KERNEL);
511         if (!b) {
512                 err = -ENOMEM;
513                 goto out;
514         }
515
516         b->kobj = kobject_create_and_add(name, &per_cpu(device_mce, cpu).kobj);
517         if (!b->kobj)
518                 goto out_free;
519
520 #ifndef CONFIG_SMP
521         b->cpus = CPU_MASK_ALL;
522 #else
523         b->cpus = per_cpu(cpu_core_map, cpu);
524 #endif
525
526         per_cpu(threshold_banks, cpu)[bank] = b;
527
528         err = work_on_cpu(cpu, local_allocate_threshold_blocks, &bank);
529         if (err)
530                 goto out_free;
531
532         for_each_cpu_mask_nr(i, b->cpus) {
533                 if (i == cpu)
534                         continue;
535
536                 err = sysfs_create_link(&per_cpu(device_mce, i).kobj,
537                                         b->kobj, name);
538                 if (err)
539                         goto out;
540
541                 per_cpu(threshold_banks, i)[bank] = b;
542         }
543
544         goto out;
545
546 out_free:
547         per_cpu(threshold_banks, cpu)[bank] = NULL;
548         kfree(b);
549 out:
550         return err;
551 }
552
553 /* create dir/files for all valid threshold banks */
554 static __cpuinit int threshold_create_device(unsigned int cpu)
555 {
556         unsigned int bank;
557         int err = 0;
558
559         for (bank = 0; bank < NR_BANKS; ++bank) {
560                 if (!(per_cpu(bank_map, cpu) & (1 << bank)))
561                         continue;
562                 err = threshold_create_bank(cpu, bank);
563                 if (err)
564                         goto out;
565         }
566 out:
567         return err;
568 }
569
570 /*
571  * let's be hotplug friendly.
572  * in case of multiple core processors, the first core always takes ownership
573  *   of shared sysfs dir/files, and rest of the cores will be symlinked to it.
574  */
575
576 static void deallocate_threshold_block(unsigned int cpu,
577                                                  unsigned int bank)
578 {
579         struct threshold_block *pos = NULL;
580         struct threshold_block *tmp = NULL;
581         struct threshold_bank *head = per_cpu(threshold_banks, cpu)[bank];
582
583         if (!head)
584                 return;
585
586         list_for_each_entry_safe(pos, tmp, &head->blocks->miscj, miscj) {
587                 kobject_put(&pos->kobj);
588                 list_del(&pos->miscj);
589                 kfree(pos);
590         }
591
592         kfree(per_cpu(threshold_banks, cpu)[bank]->blocks);
593         per_cpu(threshold_banks, cpu)[bank]->blocks = NULL;
594 }
595
596 static void threshold_remove_bank(unsigned int cpu, int bank)
597 {
598         int i = 0;
599         struct threshold_bank *b;
600         char name[32];
601
602         b = per_cpu(threshold_banks, cpu)[bank];
603
604         if (!b)
605                 return;
606
607         if (!b->blocks)
608                 goto free_out;
609
610         sprintf(name, "threshold_bank%i", bank);
611
612 #ifdef CONFIG_SMP
613         /* sibling symlink */
614         if (shared_bank[bank] && b->blocks->cpu != cpu) {
615                 sysfs_remove_link(&per_cpu(device_mce, cpu).kobj, name);
616                 per_cpu(threshold_banks, cpu)[bank] = NULL;
617                 return;
618         }
619 #endif
620
621         /* remove all sibling symlinks before unregistering */
622         for_each_cpu_mask_nr(i, b->cpus) {
623                 if (i == cpu)
624                         continue;
625
626                 sysfs_remove_link(&per_cpu(device_mce, i).kobj, name);
627                 per_cpu(threshold_banks, i)[bank] = NULL;
628         }
629
630         deallocate_threshold_block(cpu, bank);
631
632 free_out:
633         kobject_del(b->kobj);
634         kobject_put(b->kobj);
635         kfree(b);
636         per_cpu(threshold_banks, cpu)[bank] = NULL;
637 }
638
639 static void threshold_remove_device(unsigned int cpu)
640 {
641         unsigned int bank;
642
643         for (bank = 0; bank < NR_BANKS; ++bank) {
644                 if (!(per_cpu(bank_map, cpu) & (1 << bank)))
645                         continue;
646                 threshold_remove_bank(cpu, bank);
647         }
648 }
649
650 /* get notified when a cpu comes on/off */
651 static void __cpuinit amd_64_threshold_cpu_callback(unsigned long action,
652                                                      unsigned int cpu)
653 {
654         if (cpu >= NR_CPUS)
655                 return;
656
657         switch (action) {
658         case CPU_ONLINE:
659         case CPU_ONLINE_FROZEN:
660                 threshold_create_device(cpu);
661                 break;
662         case CPU_DEAD:
663         case CPU_DEAD_FROZEN:
664                 threshold_remove_device(cpu);
665                 break;
666         default:
667                 break;
668         }
669 }
670
671 static __init int threshold_init_device(void)
672 {
673         unsigned lcpu = 0;
674
675         /* to hit CPUs online before the notifier is up */
676         for_each_online_cpu(lcpu) {
677                 int err = threshold_create_device(lcpu);
678                 if (err)
679                         return err;
680         }
681         threshold_cpu_callback = amd_64_threshold_cpu_callback;
682         return 0;
683 }
684
685 device_initcall(threshold_init_device);