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[PATCH] x86_64: mce_amd cleanup
[deliverable/linux.git] / arch / x86_64 / kernel / mce_amd.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_LVTOFF_HI 0x00F00000
41 #define MASK_COUNT_EN_HI 0x00080000
42 #define MASK_INT_TYPE_HI 0x00060000
43 #define MASK_OVERFLOW_HI 0x00010000
44 #define MASK_ERR_COUNT_HI 0x00000FFF
45 #define MASK_BLKPTR_LO 0xFF000000
46 #define MCG_XBLK_ADDR 0xC0000400
47
48 struct threshold_block {
49 unsigned int block;
50 unsigned int bank;
51 unsigned int cpu;
52 u32 address;
53 u16 interrupt_enable;
54 u16 threshold_limit;
55 struct kobject kobj;
56 struct list_head miscj;
57 };
58
59 /* defaults used early on boot */
60 static struct threshold_block threshold_defaults = {
61 .interrupt_enable = 0,
62 .threshold_limit = THRESHOLD_MAX,
63 };
64
65 struct threshold_bank {
66 struct kobject kobj;
67 struct threshold_block *blocks;
68 cpumask_t cpus;
69 };
70 static DEFINE_PER_CPU(struct threshold_bank *, threshold_banks[NR_BANKS]);
71
72 #ifdef CONFIG_SMP
73 static unsigned char shared_bank[NR_BANKS] = {
74 0, 0, 0, 0, 1
75 };
76 #endif
77
78 static DEFINE_PER_CPU(unsigned char, bank_map); /* see which banks are on */
79
80 /*
81 * CPU Initialization
82 */
83
84 /* must be called with correct cpu affinity */
85 static void threshold_restart_bank(struct threshold_block *b,
86 int reset, u16 old_limit)
87 {
88 u32 mci_misc_hi, mci_misc_lo;
89
90 rdmsr(b->address, mci_misc_lo, mci_misc_hi);
91
92 if (b->threshold_limit < (mci_misc_hi & THRESHOLD_MAX))
93 reset = 1; /* limit cannot be lower than err count */
94
95 if (reset) { /* reset err count and overflow bit */
96 mci_misc_hi =
97 (mci_misc_hi & ~(MASK_ERR_COUNT_HI | MASK_OVERFLOW_HI)) |
98 (THRESHOLD_MAX - b->threshold_limit);
99 } else if (old_limit) { /* change limit w/o reset */
100 int new_count = (mci_misc_hi & THRESHOLD_MAX) +
101 (old_limit - b->threshold_limit);
102 mci_misc_hi = (mci_misc_hi & ~MASK_ERR_COUNT_HI) |
103 (new_count & THRESHOLD_MAX);
104 }
105
106 b->interrupt_enable ?
107 (mci_misc_hi = (mci_misc_hi & ~MASK_INT_TYPE_HI) | INT_TYPE_APIC) :
108 (mci_misc_hi &= ~MASK_INT_TYPE_HI);
109
110 mci_misc_hi |= MASK_COUNT_EN_HI;
111 wrmsr(b->address, mci_misc_lo, mci_misc_hi);
112 }
113
114 /* cpu init entry point, called from mce.c with preempt off */
115 void __cpuinit mce_amd_feature_init(struct cpuinfo_x86 *c)
116 {
117 unsigned int bank, block;
118 unsigned int cpu = smp_processor_id();
119 u32 low = 0, high = 0, address = 0;
120
121 for (bank = 0; bank < NR_BANKS; ++bank) {
122 for (block = 0; block < NR_BLOCKS; ++block) {
123 if (block == 0)
124 address = MSR_IA32_MC0_MISC + bank * 4;
125 else if (block == 1)
126 address = MCG_XBLK_ADDR
127 + ((low & MASK_BLKPTR_LO) >> 21);
128 else
129 ++address;
130
131 if (rdmsr_safe(address, &low, &high))
132 continue;
133
134 if (!(high & MASK_VALID_HI)) {
135 if (block)
136 continue;
137 else
138 break;
139 }
140
141 if (!(high & MASK_VALID_HI >> 1) ||
142 (high & MASK_VALID_HI >> 2))
143 continue;
144
145 if (!block)
146 per_cpu(bank_map, cpu) |= (1 << bank);
147 #ifdef CONFIG_SMP
148 if (shared_bank[bank] && c->cpu_core_id)
149 break;
150 #endif
151 high &= ~MASK_LVTOFF_HI;
152 high |= K8_APIC_EXT_LVT_ENTRY_THRESHOLD << 20;
153 wrmsr(address, low, high);
154
155 setup_APIC_extened_lvt(K8_APIC_EXT_LVT_ENTRY_THRESHOLD,
156 THRESHOLD_APIC_VECTOR,
157 K8_APIC_EXT_INT_MSG_FIX, 0);
158
159 threshold_defaults.address = address;
160 threshold_restart_bank(&threshold_defaults, 0, 0);
161 }
162 }
163 }
164
165 /*
166 * APIC Interrupt Handler
167 */
168
169 /*
170 * threshold interrupt handler will service THRESHOLD_APIC_VECTOR.
171 * the interrupt goes off when error_count reaches threshold_limit.
172 * the handler will simply log mcelog w/ software defined bank number.
173 */
174 asmlinkage void mce_threshold_interrupt(void)
175 {
176 unsigned int bank, block;
177 struct mce m;
178 u32 low = 0, high = 0, address = 0;
179
180 ack_APIC_irq();
181 exit_idle();
182 irq_enter();
183
184 memset(&m, 0, sizeof(m));
185 rdtscll(m.tsc);
186 m.cpu = smp_processor_id();
187
188 /* assume first bank caused it */
189 for (bank = 0; bank < NR_BANKS; ++bank) {
190 for (block = 0; block < NR_BLOCKS; ++block) {
191 if (block == 0)
192 address = MSR_IA32_MC0_MISC + bank * 4;
193 else if (block == 1)
194 address = MCG_XBLK_ADDR
195 + ((low & MASK_BLKPTR_LO) >> 21);
196 else
197 ++address;
198
199 if (rdmsr_safe(address, &low, &high))
200 continue;
201
202 if (!(high & MASK_VALID_HI)) {
203 if (block)
204 continue;
205 else
206 break;
207 }
208
209 if (!(high & MASK_VALID_HI >> 1) ||
210 (high & MASK_VALID_HI >> 2))
211 continue;
212
213 if (high & MASK_OVERFLOW_HI) {
214 rdmsrl(address, m.misc);
215 rdmsrl(MSR_IA32_MC0_STATUS + bank * 4,
216 m.status);
217 m.bank = K8_MCE_THRESHOLD_BASE
218 + bank * NR_BLOCKS
219 + block;
220 mce_log(&m);
221 goto out;
222 }
223 }
224 }
225 out:
226 irq_exit();
227 }
228
229 /*
230 * Sysfs Interface
231 */
232
233 struct threshold_attr {
234 struct attribute attr;
235 ssize_t(*show) (struct threshold_block *, char *);
236 ssize_t(*store) (struct threshold_block *, const char *, size_t count);
237 };
238
239 static cpumask_t affinity_set(unsigned int cpu)
240 {
241 cpumask_t oldmask = current->cpus_allowed;
242 cpumask_t newmask = CPU_MASK_NONE;
243 cpu_set(cpu, newmask);
244 set_cpus_allowed(current, newmask);
245 return oldmask;
246 }
247
248 static void affinity_restore(cpumask_t oldmask)
249 {
250 set_cpus_allowed(current, oldmask);
251 }
252
253 #define SHOW_FIELDS(name) \
254 static ssize_t show_ ## name(struct threshold_block * b, char *buf) \
255 { \
256 return sprintf(buf, "%lx\n", (unsigned long) b->name); \
257 }
258 SHOW_FIELDS(interrupt_enable)
259 SHOW_FIELDS(threshold_limit)
260
261 static ssize_t store_interrupt_enable(struct threshold_block *b,
262 const char *buf, size_t count)
263 {
264 char *end;
265 cpumask_t oldmask;
266 unsigned long new = simple_strtoul(buf, &end, 0);
267 if (end == buf)
268 return -EINVAL;
269 b->interrupt_enable = !!new;
270
271 oldmask = affinity_set(b->cpu);
272 threshold_restart_bank(b, 0, 0);
273 affinity_restore(oldmask);
274
275 return end - buf;
276 }
277
278 static ssize_t store_threshold_limit(struct threshold_block *b,
279 const char *buf, size_t count)
280 {
281 char *end;
282 cpumask_t oldmask;
283 u16 old;
284 unsigned long new = simple_strtoul(buf, &end, 0);
285 if (end == buf)
286 return -EINVAL;
287 if (new > THRESHOLD_MAX)
288 new = THRESHOLD_MAX;
289 if (new < 1)
290 new = 1;
291 old = b->threshold_limit;
292 b->threshold_limit = new;
293
294 oldmask = affinity_set(b->cpu);
295 threshold_restart_bank(b, 0, old);
296 affinity_restore(oldmask);
297
298 return end - buf;
299 }
300
301 static ssize_t show_error_count(struct threshold_block *b, char *buf)
302 {
303 u32 high, low;
304 cpumask_t oldmask;
305 oldmask = affinity_set(b->cpu);
306 rdmsr(b->address, low, high);
307 affinity_restore(oldmask);
308 return sprintf(buf, "%x\n",
309 (high & 0xFFF) - (THRESHOLD_MAX - b->threshold_limit));
310 }
311
312 static ssize_t store_error_count(struct threshold_block *b,
313 const char *buf, size_t count)
314 {
315 cpumask_t oldmask;
316 oldmask = affinity_set(b->cpu);
317 threshold_restart_bank(b, 1, 0);
318 affinity_restore(oldmask);
319 return 1;
320 }
321
322 #define THRESHOLD_ATTR(_name,_mode,_show,_store) { \
323 .attr = {.name = __stringify(_name), .mode = _mode }, \
324 .show = _show, \
325 .store = _store, \
326 };
327
328 #define RW_ATTR(name) \
329 static struct threshold_attr name = \
330 THRESHOLD_ATTR(name, 0644, show_## name, store_## name)
331
332 RW_ATTR(interrupt_enable);
333 RW_ATTR(threshold_limit);
334 RW_ATTR(error_count);
335
336 static struct attribute *default_attrs[] = {
337 &interrupt_enable.attr,
338 &threshold_limit.attr,
339 &error_count.attr,
340 NULL
341 };
342
343 #define to_block(k) container_of(k, struct threshold_block, kobj)
344 #define to_attr(a) container_of(a, struct threshold_attr, attr)
345
346 static ssize_t show(struct kobject *kobj, struct attribute *attr, char *buf)
347 {
348 struct threshold_block *b = to_block(kobj);
349 struct threshold_attr *a = to_attr(attr);
350 ssize_t ret;
351 ret = a->show ? a->show(b, buf) : -EIO;
352 return ret;
353 }
354
355 static ssize_t store(struct kobject *kobj, struct attribute *attr,
356 const char *buf, size_t count)
357 {
358 struct threshold_block *b = to_block(kobj);
359 struct threshold_attr *a = to_attr(attr);
360 ssize_t ret;
361 ret = a->store ? a->store(b, buf, count) : -EIO;
362 return ret;
363 }
364
365 static struct sysfs_ops threshold_ops = {
366 .show = show,
367 .store = store,
368 };
369
370 static struct kobj_type threshold_ktype = {
371 .sysfs_ops = &threshold_ops,
372 .default_attrs = default_attrs,
373 };
374
375 static __cpuinit int allocate_threshold_blocks(unsigned int cpu,
376 unsigned int bank,
377 unsigned int block,
378 u32 address)
379 {
380 int err;
381 u32 low, high;
382 struct threshold_block *b = NULL;
383
384 if ((bank >= NR_BANKS) || (block >= NR_BLOCKS))
385 return 0;
386
387 if (rdmsr_safe(address, &low, &high))
388 goto recurse;
389
390 if (!(high & MASK_VALID_HI)) {
391 if (block)
392 goto recurse;
393 else
394 return 0;
395 }
396
397 if (!(high & MASK_VALID_HI >> 1) ||
398 (high & MASK_VALID_HI >> 2))
399 goto recurse;
400
401 b = kzalloc(sizeof(struct threshold_block), GFP_KERNEL);
402 if (!b)
403 return -ENOMEM;
404 memset(b, 0, sizeof(struct threshold_block));
405
406 b->block = block;
407 b->bank = bank;
408 b->cpu = cpu;
409 b->address = address;
410 b->interrupt_enable = 0;
411 b->threshold_limit = THRESHOLD_MAX;
412
413 INIT_LIST_HEAD(&b->miscj);
414
415 if (per_cpu(threshold_banks, cpu)[bank]->blocks)
416 list_add(&b->miscj,
417 &per_cpu(threshold_banks, cpu)[bank]->blocks->miscj);
418 else
419 per_cpu(threshold_banks, cpu)[bank]->blocks = b;
420
421 kobject_set_name(&b->kobj, "misc%i", block);
422 b->kobj.parent = &per_cpu(threshold_banks, cpu)[bank]->kobj;
423 b->kobj.ktype = &threshold_ktype;
424 err = kobject_register(&b->kobj);
425 if (err)
426 goto out_free;
427 recurse:
428 if (!block) {
429 address = (low & MASK_BLKPTR_LO) >> 21;
430 if (!address)
431 return 0;
432 address += MCG_XBLK_ADDR;
433 } else
434 ++address;
435
436 err = allocate_threshold_blocks(cpu, bank, ++block, address);
437 if (err)
438 goto out_free;
439
440 return err;
441
442 out_free:
443 if (b) {
444 kobject_unregister(&b->kobj);
445 kfree(b);
446 }
447 return err;
448 }
449
450 /* symlinks sibling shared banks to first core. first core owns dir/files. */
451 static __cpuinit int threshold_create_bank(unsigned int cpu, unsigned int bank)
452 {
453 int i, err = 0;
454 struct threshold_bank *b = NULL;
455 cpumask_t oldmask = CPU_MASK_NONE;
456 char name[32];
457
458 sprintf(name, "threshold_bank%i", bank);
459
460 #ifdef CONFIG_SMP
461 if (cpu_data[cpu].cpu_core_id && shared_bank[bank]) { /* symlink */
462 i = first_cpu(cpu_core_map[cpu]);
463
464 /* first core not up yet */
465 if (cpu_data[i].cpu_core_id)
466 goto out;
467
468 /* already linked */
469 if (per_cpu(threshold_banks, cpu)[bank])
470 goto out;
471
472 b = per_cpu(threshold_banks, i)[bank];
473
474 if (!b)
475 goto out;
476
477 err = sysfs_create_link(&per_cpu(device_mce, cpu).kobj,
478 &b->kobj, name);
479 if (err)
480 goto out;
481
482 b->cpus = cpu_core_map[cpu];
483 per_cpu(threshold_banks, cpu)[bank] = b;
484 goto out;
485 }
486 #endif
487
488 b = kzalloc(sizeof(struct threshold_bank), GFP_KERNEL);
489 if (!b) {
490 err = -ENOMEM;
491 goto out;
492 }
493 memset(b, 0, sizeof(struct threshold_bank));
494
495 kobject_set_name(&b->kobj, "threshold_bank%i", bank);
496 b->kobj.parent = &per_cpu(device_mce, cpu).kobj;
497 #ifndef CONFIG_SMP
498 b->cpus = CPU_MASK_ALL;
499 #else
500 b->cpus = cpu_core_map[cpu];
501 #endif
502 err = kobject_register(&b->kobj);
503 if (err)
504 goto out_free;
505
506 per_cpu(threshold_banks, cpu)[bank] = b;
507
508 oldmask = affinity_set(cpu);
509 err = allocate_threshold_blocks(cpu, bank, 0,
510 MSR_IA32_MC0_MISC + bank * 4);
511 affinity_restore(oldmask);
512
513 if (err)
514 goto out_free;
515
516 for_each_cpu_mask(i, b->cpus) {
517 if (i == cpu)
518 continue;
519
520 err = sysfs_create_link(&per_cpu(device_mce, i).kobj,
521 &b->kobj, name);
522 if (err)
523 goto out;
524
525 per_cpu(threshold_banks, i)[bank] = b;
526 }
527
528 goto out;
529
530 out_free:
531 per_cpu(threshold_banks, cpu)[bank] = NULL;
532 kfree(b);
533 out:
534 return err;
535 }
536
537 /* create dir/files for all valid threshold banks */
538 static __cpuinit int threshold_create_device(unsigned int cpu)
539 {
540 unsigned int bank;
541 int err = 0;
542
543 for (bank = 0; bank < NR_BANKS; ++bank) {
544 if (!(per_cpu(bank_map, cpu) & 1 << bank))
545 continue;
546 err = threshold_create_bank(cpu, bank);
547 if (err)
548 goto out;
549 }
550 out:
551 return err;
552 }
553
554 #ifdef CONFIG_HOTPLUG_CPU
555 /*
556 * let's be hotplug friendly.
557 * in case of multiple core processors, the first core always takes ownership
558 * of shared sysfs dir/files, and rest of the cores will be symlinked to it.
559 */
560
561 static __cpuinit void deallocate_threshold_block(unsigned int cpu,
562 unsigned int bank)
563 {
564 struct threshold_block *pos = NULL;
565 struct threshold_block *tmp = NULL;
566 struct threshold_bank *head = per_cpu(threshold_banks, cpu)[bank];
567
568 if (!head)
569 return;
570
571 list_for_each_entry_safe(pos, tmp, &head->blocks->miscj, miscj) {
572 kobject_unregister(&pos->kobj);
573 list_del(&pos->miscj);
574 kfree(pos);
575 }
576
577 kfree(per_cpu(threshold_banks, cpu)[bank]->blocks);
578 per_cpu(threshold_banks, cpu)[bank]->blocks = NULL;
579 }
580
581 static __cpuinit void threshold_remove_bank(unsigned int cpu, int bank)
582 {
583 int i = 0;
584 struct threshold_bank *b;
585 char name[32];
586
587 b = per_cpu(threshold_banks, cpu)[bank];
588
589 if (!b)
590 return;
591
592 if (!b->blocks)
593 goto free_out;
594
595 sprintf(name, "threshold_bank%i", bank);
596
597 /* sibling symlink */
598 if (shared_bank[bank] && b->blocks->cpu != cpu) {
599 sysfs_remove_link(&per_cpu(device_mce, cpu).kobj, name);
600 per_cpu(threshold_banks, i)[bank] = NULL;
601 return;
602 }
603
604 /* remove all sibling symlinks before unregistering */
605 for_each_cpu_mask(i, b->cpus) {
606 if (i == cpu)
607 continue;
608
609 sysfs_remove_link(&per_cpu(device_mce, i).kobj, name);
610 per_cpu(threshold_banks, i)[bank] = NULL;
611 }
612
613 deallocate_threshold_block(cpu, bank);
614
615 free_out:
616 kobject_unregister(&b->kobj);
617 kfree(b);
618 per_cpu(threshold_banks, cpu)[bank] = NULL;
619 }
620
621 static __cpuinit void threshold_remove_device(unsigned int cpu)
622 {
623 unsigned int bank;
624
625 for (bank = 0; bank < NR_BANKS; ++bank) {
626 if (!(per_cpu(bank_map, cpu) & 1 << bank))
627 continue;
628 threshold_remove_bank(cpu, bank);
629 }
630 }
631
632 #else /* !CONFIG_HOTPLUG_CPU */
633 static void threshold_remove_device(unsigned int cpu)
634 {
635 }
636 #endif
637
638 /* get notified when a cpu comes on/off */
639 static int threshold_cpu_callback(struct notifier_block *nfb,
640 unsigned long action, void *hcpu)
641 {
642 /* cpu was unsigned int to begin with */
643 unsigned int cpu = (unsigned long)hcpu;
644
645 if (cpu >= NR_CPUS)
646 goto out;
647
648 switch (action) {
649 case CPU_ONLINE:
650 threshold_create_device(cpu);
651 break;
652 case CPU_DEAD:
653 threshold_remove_device(cpu);
654 break;
655 default:
656 break;
657 }
658 out:
659 return NOTIFY_OK;
660 }
661
662 static struct notifier_block threshold_cpu_notifier = {
663 .notifier_call = threshold_cpu_callback,
664 };
665
666 static __init int threshold_init_device(void)
667 {
668 unsigned lcpu = 0;
669
670 /* to hit CPUs online before the notifier is up */
671 for_each_online_cpu(lcpu) {
672 int err = threshold_create_device(lcpu);
673 if (err)
674 return err;
675 }
676 register_cpu_notifier(&threshold_cpu_notifier);
677 return 0;
678 }
679
680 device_initcall(threshold_init_device);
Linux kernel - Deliverables
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