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Merge branch 'linus' into cpumask-for-linus
[linux-2.6/mini2440.git] / arch / x86 / kernel / cpu / mcheck / mce_amd_64.c
blob56dde9c4bc96b8fe3202a2051a500efe52853b0f
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_var_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 static void amd_threshold_interrupt(void);
83
84 /*
85 * CPU Initialization
86 */
87
88 struct thresh_restart {
89 struct threshold_block *b;
90 int reset;
91 u16 old_limit;
92 };
93
94 /* must be called with correct cpu affinity */
95 /* Called via smp_call_function_single() */
96 static void threshold_restart_bank(void *_tr)
97 {
98 struct thresh_restart *tr = _tr;
99 u32 mci_misc_hi, mci_misc_lo;
100
101 rdmsr(tr->b->address, mci_misc_lo, mci_misc_hi);
102
103 if (tr->b->threshold_limit < (mci_misc_hi & THRESHOLD_MAX))
104 tr->reset = 1; /* limit cannot be lower than err count */
105
106 if (tr->reset) { /* reset err count and overflow bit */
107 mci_misc_hi =
108 (mci_misc_hi & ~(MASK_ERR_COUNT_HI | MASK_OVERFLOW_HI)) |
109 (THRESHOLD_MAX - tr->b->threshold_limit);
110 } else if (tr->old_limit) { /* change limit w/o reset */
111 int new_count = (mci_misc_hi & THRESHOLD_MAX) +
112 (tr->old_limit - tr->b->threshold_limit);
113 mci_misc_hi = (mci_misc_hi & ~MASK_ERR_COUNT_HI) |
114 (new_count & THRESHOLD_MAX);
115 }
116
117 tr->b->interrupt_enable ?
118 (mci_misc_hi = (mci_misc_hi & ~MASK_INT_TYPE_HI) | INT_TYPE_APIC) :
119 (mci_misc_hi &= ~MASK_INT_TYPE_HI);
120
121 mci_misc_hi |= MASK_COUNT_EN_HI;
122 wrmsr(tr->b->address, mci_misc_lo, mci_misc_hi);
123 }
124
125 /* cpu init entry point, called from mce.c with preempt off */
126 void mce_amd_feature_init(struct cpuinfo_x86 *c)
127 {
128 unsigned int bank, block;
129 unsigned int cpu = smp_processor_id();
130 u8 lvt_off;
131 u32 low = 0, high = 0, address = 0;
132 struct thresh_restart tr;
133
134 for (bank = 0; bank < NR_BANKS; ++bank) {
135 for (block = 0; block < NR_BLOCKS; ++block) {
136 if (block == 0)
137 address = MSR_IA32_MC0_MISC + bank * 4;
138 else if (block == 1) {
139 address = (low & MASK_BLKPTR_LO) >> 21;
140 if (!address)
141 break;
142 address += MCG_XBLK_ADDR;
143 }
144 else
145 ++address;
146
147 if (rdmsr_safe(address, &low, &high))
148 break;
149
150 if (!(high & MASK_VALID_HI)) {
151 if (block)
152 continue;
153 else
154 break;
155 }
156
157 if (!(high & MASK_CNTP_HI) ||
158 (high & MASK_LOCKED_HI))
159 continue;
160
161 if (!block)
162 per_cpu(bank_map, cpu) |= (1 << bank);
163 #ifdef CONFIG_SMP
164 if (shared_bank[bank] && c->cpu_core_id)
165 break;
166 #endif
167 lvt_off = setup_APIC_eilvt_mce(THRESHOLD_APIC_VECTOR,
168 APIC_EILVT_MSG_FIX, 0);
169
170 high &= ~MASK_LVTOFF_HI;
171 high |= lvt_off << 20;
172 wrmsr(address, low, high);
173
174 threshold_defaults.address = address;
175 tr.b = &threshold_defaults;
176 tr.reset = 0;
177 tr.old_limit = 0;
178 threshold_restart_bank(&tr);
179
180 mce_threshold_vector = amd_threshold_interrupt;
181 }
182 }
183 }
184
185 /*
186 * APIC Interrupt Handler
187 */
188
189 /*
190 * threshold interrupt handler will service THRESHOLD_APIC_VECTOR.
191 * the interrupt goes off when error_count reaches threshold_limit.
192 * the handler will simply log mcelog w/ software defined bank number.
193 */
194 static void amd_threshold_interrupt(void)
195 {
196 unsigned int bank, block;
197 struct mce m;
198 u32 low = 0, high = 0, address = 0;
199
200 mce_setup(&m);
201
202 /* assume first bank caused it */
203 for (bank = 0; bank < NR_BANKS; ++bank) {
204 if (!(per_cpu(bank_map, m.cpu) & (1 << bank)))
205 continue;
206 for (block = 0; block < NR_BLOCKS; ++block) {
207 if (block == 0)
208 address = MSR_IA32_MC0_MISC + bank * 4;
209 else if (block == 1) {
210 address = (low & MASK_BLKPTR_LO) >> 21;
211 if (!address)
212 break;
213 address += MCG_XBLK_ADDR;
214 }
215 else
216 ++address;
217
218 if (rdmsr_safe(address, &low, &high))
219 break;
220
221 if (!(high & MASK_VALID_HI)) {
222 if (block)
223 continue;
224 else
225 break;
226 }
227
228 if (!(high & MASK_CNTP_HI) ||
229 (high & MASK_LOCKED_HI))
230 continue;
231
232 /* Log the machine check that caused the threshold
233 event. */
234 machine_check_poll(MCP_TIMESTAMP,
235 &__get_cpu_var(mce_poll_banks));
236
237 if (high & MASK_OVERFLOW_HI) {
238 rdmsrl(address, m.misc);
239 rdmsrl(MSR_IA32_MC0_STATUS + bank * 4,
240 m.status);
241 m.bank = K8_MCE_THRESHOLD_BASE
242 + bank * NR_BLOCKS
243 + block;
244 mce_log(&m);
245 return;
246 }
247 }
248 }
249 }
250
251 /*
252 * Sysfs Interface
253 */
254
255 struct threshold_attr {
256 struct attribute attr;
257 ssize_t(*show) (struct threshold_block *, char *);
258 ssize_t(*store) (struct threshold_block *, const char *, size_t count);
259 };
260
261 #define SHOW_FIELDS(name) \
262 static ssize_t show_ ## name(struct threshold_block * b, char *buf) \
263 { \
264 return sprintf(buf, "%lx\n", (unsigned long) b->name); \
265 }
266 SHOW_FIELDS(interrupt_enable)
267 SHOW_FIELDS(threshold_limit)
268
269 static ssize_t store_interrupt_enable(struct threshold_block *b,
270 const char *buf, size_t count)
271 {
272 char *end;
273 struct thresh_restart tr;
274 unsigned long new = simple_strtoul(buf, &end, 0);
275 if (end == buf)
276 return -EINVAL;
277 b->interrupt_enable = !!new;
278
279 tr.b = b;
280 tr.reset = 0;
281 tr.old_limit = 0;
282 smp_call_function_single(b->cpu, threshold_restart_bank, &tr, 1);
283
284 return end - buf;
285 }
286
287 static ssize_t store_threshold_limit(struct threshold_block *b,
288 const char *buf, size_t count)
289 {
290 char *end;
291 struct thresh_restart tr;
292 unsigned long new = simple_strtoul(buf, &end, 0);
293 if (end == buf)
294 return -EINVAL;
295 if (new > THRESHOLD_MAX)
296 new = THRESHOLD_MAX;
297 if (new < 1)
298 new = 1;
299 tr.old_limit = b->threshold_limit;
300 b->threshold_limit = new;
301 tr.b = b;
302 tr.reset = 0;
303
304 smp_call_function_single(b->cpu, threshold_restart_bank, &tr, 1);
305
306 return end - buf;
307 }
308
309 struct threshold_block_cross_cpu {
310 struct threshold_block *tb;
311 long retval;
312 };
313
314 static void local_error_count_handler(void *_tbcc)
315 {
316 struct threshold_block_cross_cpu *tbcc = _tbcc;
317 struct threshold_block *b = tbcc->tb;
318 u32 low, high;
319
320 rdmsr(b->address, low, high);
321 tbcc->retval = (high & 0xFFF) - (THRESHOLD_MAX - b->threshold_limit);
322 }
323
324 static ssize_t show_error_count(struct threshold_block *b, char *buf)
325 {
326 struct threshold_block_cross_cpu tbcc = { .tb = b, };
327
328 smp_call_function_single(b->cpu, local_error_count_handler, &tbcc, 1);
329 return sprintf(buf, "%lx\n", tbcc.retval);
330 }
331
332 static ssize_t store_error_count(struct threshold_block *b,
333 const char *buf, size_t count)
334 {
335 struct thresh_restart tr = { .b = b, .reset = 1, .old_limit = 0 };
336
337 smp_call_function_single(b->cpu, threshold_restart_bank, &tr, 1);
338 return 1;
339 }
340
341 #define THRESHOLD_ATTR(_name,_mode,_show,_store) { \
342 .attr = {.name = __stringify(_name), .mode = _mode }, \
343 .show = _show, \
344 .store = _store, \
345 };
346
347 #define RW_ATTR(name) \
348 static struct threshold_attr name = \
349 THRESHOLD_ATTR(name, 0644, show_## name, store_## name)
350
351 RW_ATTR(interrupt_enable);
352 RW_ATTR(threshold_limit);
353 RW_ATTR(error_count);
354
355 static struct attribute *default_attrs[] = {
356 &interrupt_enable.attr,
357 &threshold_limit.attr,
358 &error_count.attr,
359 NULL
360 };
361
362 #define to_block(k) container_of(k, struct threshold_block, kobj)
363 #define to_attr(a) container_of(a, struct threshold_attr, attr)
364
365 static ssize_t show(struct kobject *kobj, struct attribute *attr, char *buf)
366 {
367 struct threshold_block *b = to_block(kobj);
368 struct threshold_attr *a = to_attr(attr);
369 ssize_t ret;
370 ret = a->show ? a->show(b, buf) : -EIO;
371 return ret;
372 }
373
374 static ssize_t store(struct kobject *kobj, struct attribute *attr,
375 const char *buf, size_t count)
376 {
377 struct threshold_block *b = to_block(kobj);
378 struct threshold_attr *a = to_attr(attr);
379 ssize_t ret;
380 ret = a->store ? a->store(b, buf, count) : -EIO;
381 return ret;
382 }
383
384 static struct sysfs_ops threshold_ops = {
385 .show = show,
386 .store = store,
387 };
388
389 static struct kobj_type threshold_ktype = {
390 .sysfs_ops = &threshold_ops,
391 .default_attrs = default_attrs,
392 };
393
394 static __cpuinit int allocate_threshold_blocks(unsigned int cpu,
395 unsigned int bank,
396 unsigned int block,
397 u32 address)
398 {
399 int err;
400 u32 low, high;
401 struct threshold_block *b = NULL;
402
403 if ((bank >= NR_BANKS) || (block >= NR_BLOCKS))
404 return 0;
405
406 if (rdmsr_safe_on_cpu(cpu, address, &low, &high))
407 return 0;
408
409 if (!(high & MASK_VALID_HI)) {
410 if (block)
411 goto recurse;
412 else
413 return 0;
414 }
415
416 if (!(high & MASK_CNTP_HI) ||
417 (high & MASK_LOCKED_HI))
418 goto recurse;
419
420 b = kzalloc(sizeof(struct threshold_block), GFP_KERNEL);
421 if (!b)
422 return -ENOMEM;
423
424 b->block = block;
425 b->bank = bank;
426 b->cpu = cpu;
427 b->address = address;
428 b->interrupt_enable = 0;
429 b->threshold_limit = THRESHOLD_MAX;
430
431 INIT_LIST_HEAD(&b->miscj);
432
433 if (per_cpu(threshold_banks, cpu)[bank]->blocks)
434 list_add(&b->miscj,
435 &per_cpu(threshold_banks, cpu)[bank]->blocks->miscj);
436 else
437 per_cpu(threshold_banks, cpu)[bank]->blocks = b;
438
439 err = kobject_init_and_add(&b->kobj, &threshold_ktype,
440 per_cpu(threshold_banks, cpu)[bank]->kobj,
441 "misc%i", block);
442 if (err)
443 goto out_free;
444 recurse:
445 if (!block) {
446 address = (low & MASK_BLKPTR_LO) >> 21;
447 if (!address)
448 return 0;
449 address += MCG_XBLK_ADDR;
450 } else
451 ++address;
452
453 err = allocate_threshold_blocks(cpu, bank, ++block, address);
454 if (err)
455 goto out_free;
456
457 if (b)
458 kobject_uevent(&b->kobj, KOBJ_ADD);
459
460 return err;
461
462 out_free:
463 if (b) {
464 kobject_put(&b->kobj);
465 kfree(b);
466 }
467 return err;
468 }
469
470 static __cpuinit long
471 local_allocate_threshold_blocks(int cpu, unsigned int bank)
472 {
473 return allocate_threshold_blocks(cpu, bank, 0,
474 MSR_IA32_MC0_MISC + bank * 4);
475 }
476
477 /* symlinks sibling shared banks to first core. first core owns dir/files. */
478 static __cpuinit int threshold_create_bank(unsigned int cpu, unsigned int bank)
479 {
480 int i, err = 0;
481 struct threshold_bank *b = NULL;
482 char name[32];
483
484 sprintf(name, "threshold_bank%i", bank);
485
486 #ifdef CONFIG_SMP
487 if (cpu_data(cpu).cpu_core_id && shared_bank[bank]) { /* symlink */
488 i = cpumask_first(cpu_core_mask(cpu));
489
490 /* first core not up yet */
491 if (cpu_data(i).cpu_core_id)
492 goto out;
493
494 /* already linked */
495 if (per_cpu(threshold_banks, cpu)[bank])
496 goto out;
497
498 b = per_cpu(threshold_banks, i)[bank];
499
500 if (!b)
501 goto out;
502
503 err = sysfs_create_link(&per_cpu(device_mce, cpu).kobj,
504 b->kobj, name);
505 if (err)
506 goto out;
507
508 cpumask_copy(b->cpus, cpu_core_mask(cpu));
509 per_cpu(threshold_banks, cpu)[bank] = b;
510 goto out;
511 }
512 #endif
513
514 b = kzalloc(sizeof(struct threshold_bank), GFP_KERNEL);
515 if (!b) {
516 err = -ENOMEM;
517 goto out;
518 }
519 if (!alloc_cpumask_var(&b->cpus, GFP_KERNEL)) {
520 kfree(b);
521 err = -ENOMEM;
522 goto out;
523 }
524
525 b->kobj = kobject_create_and_add(name, &per_cpu(device_mce, cpu).kobj);
526 if (!b->kobj)
527 goto out_free;
528
529 #ifndef CONFIG_SMP
530 cpumask_setall(b->cpus);
531 #else
532 cpumask_copy(b->cpus, cpu_core_mask(cpu));
533 #endif
534
535 per_cpu(threshold_banks, cpu)[bank] = b;
536
537 err = local_allocate_threshold_blocks(cpu, bank);
538 if (err)
539 goto out_free;
540
541 for_each_cpu(i, b->cpus) {
542 if (i == cpu)
543 continue;
544
545 err = sysfs_create_link(&per_cpu(device_mce, i).kobj,
546 b->kobj, name);
547 if (err)
548 goto out;
549
550 per_cpu(threshold_banks, i)[bank] = b;
551 }
552
553 goto out;
554
555 out_free:
556 per_cpu(threshold_banks, cpu)[bank] = NULL;
557 free_cpumask_var(b->cpus);
558 kfree(b);
559 out:
560 return err;
561 }
562
563 /* create dir/files for all valid threshold banks */
564 static __cpuinit int threshold_create_device(unsigned int cpu)
565 {
566 unsigned int bank;
567 int err = 0;
568
569 for (bank = 0; bank < NR_BANKS; ++bank) {
570 if (!(per_cpu(bank_map, cpu) & (1 << bank)))
571 continue;
572 err = threshold_create_bank(cpu, bank);
573 if (err)
574 goto out;
575 }
576 out:
577 return err;
578 }
579
580 /*
581 * let's be hotplug friendly.
582 * in case of multiple core processors, the first core always takes ownership
583 * of shared sysfs dir/files, and rest of the cores will be symlinked to it.
584 */
585
586 static void deallocate_threshold_block(unsigned int cpu,
587 unsigned int bank)
588 {
589 struct threshold_block *pos = NULL;
590 struct threshold_block *tmp = NULL;
591 struct threshold_bank *head = per_cpu(threshold_banks, cpu)[bank];
592
593 if (!head)
594 return;
595
596 list_for_each_entry_safe(pos, tmp, &head->blocks->miscj, miscj) {
597 kobject_put(&pos->kobj);
598 list_del(&pos->miscj);
599 kfree(pos);
600 }
601
602 kfree(per_cpu(threshold_banks, cpu)[bank]->blocks);
603 per_cpu(threshold_banks, cpu)[bank]->blocks = NULL;
604 }
605
606 static void threshold_remove_bank(unsigned int cpu, int bank)
607 {
608 int i = 0;
609 struct threshold_bank *b;
610 char name[32];
611
612 b = per_cpu(threshold_banks, cpu)[bank];
613
614 if (!b)
615 return;
616
617 if (!b->blocks)
618 goto free_out;
619
620 sprintf(name, "threshold_bank%i", bank);
621
622 #ifdef CONFIG_SMP
623 /* sibling symlink */
624 if (shared_bank[bank] && b->blocks->cpu != cpu) {
625 sysfs_remove_link(&per_cpu(device_mce, cpu).kobj, name);
626 per_cpu(threshold_banks, cpu)[bank] = NULL;
627 return;
628 }
629 #endif
630
631 /* remove all sibling symlinks before unregistering */
632 for_each_cpu(i, b->cpus) {
633 if (i == cpu)
634 continue;
635
636 sysfs_remove_link(&per_cpu(device_mce, i).kobj, name);
637 per_cpu(threshold_banks, i)[bank] = NULL;
638 }
639
640 deallocate_threshold_block(cpu, bank);
641
642 free_out:
643 kobject_del(b->kobj);
644 kobject_put(b->kobj);
645 free_cpumask_var(b->cpus);
646 kfree(b);
647 per_cpu(threshold_banks, cpu)[bank] = NULL;
648 }
649
650 static void threshold_remove_device(unsigned int cpu)
651 {
652 unsigned int bank;
653
654 for (bank = 0; bank < NR_BANKS; ++bank) {
655 if (!(per_cpu(bank_map, cpu) & (1 << bank)))
656 continue;
657 threshold_remove_bank(cpu, bank);
658 }
659 }
660
661 /* get notified when a cpu comes on/off */
662 static void __cpuinit amd_64_threshold_cpu_callback(unsigned long action,
663 unsigned int cpu)
664 {
665 if (cpu >= NR_CPUS)
666 return;
667
668 switch (action) {
669 case CPU_ONLINE:
670 case CPU_ONLINE_FROZEN:
671 threshold_create_device(cpu);
672 break;
673 case CPU_DEAD:
674 case CPU_DEAD_FROZEN:
675 threshold_remove_device(cpu);
676 break;
677 default:
678 break;
679 }
680 }
681
682 static __init int threshold_init_device(void)
683 {
684 unsigned lcpu = 0;
685
686 /* to hit CPUs online before the notifier is up */
687 for_each_online_cpu(lcpu) {
688 int err = threshold_create_device(lcpu);
689 if (err)
690 return err;
691 }
692 threshold_cpu_callback = amd_64_threshold_cpu_callback;
693 return 0;
694 }
695
696 device_initcall(threshold_init_device);
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