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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Machine check exception handling.
4 *
5 * Copyright 2013 IBM Corporation
6 * Author: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com>
7 */
8
9#undef DEBUG
10#define pr_fmt(fmt) "mce: " fmt
11
12#include <linux/hardirq.h>
13#include <linux/types.h>
14#include <linux/ptrace.h>
15#include <linux/percpu.h>
16#include <linux/export.h>
17#include <linux/irq_work.h>
18#include <linux/extable.h>
19#include <linux/ftrace.h>
20#include <linux/memblock.h>
21#include <linux/of.h>
22
23#include <asm/interrupt.h>
24#include <asm/machdep.h>
25#include <asm/mce.h>
26#include <asm/nmi.h>
27
28#include "setup.h"
29
30static void machine_check_ue_event(struct machine_check_event *evt);
31static void machine_process_ue_event(struct work_struct *work);
32
33static DECLARE_WORK(mce_ue_event_work, machine_process_ue_event);
34
35static BLOCKING_NOTIFIER_HEAD(mce_notifier_list);
36
37int mce_register_notifier(struct notifier_block *nb)
38{
39 return blocking_notifier_chain_register(&mce_notifier_list, nb);
40}
41EXPORT_SYMBOL_GPL(mce_register_notifier);
42
43int mce_unregister_notifier(struct notifier_block *nb)
44{
45 return blocking_notifier_chain_unregister(&mce_notifier_list, nb);
46}
47EXPORT_SYMBOL_GPL(mce_unregister_notifier);
48
49static void mce_set_error_info(struct machine_check_event *mce,
50 struct mce_error_info *mce_err)
51{
52 mce->error_type = mce_err->error_type;
53 switch (mce_err->error_type) {
54 case MCE_ERROR_TYPE_UE:
55 mce->u.ue_error.ue_error_type = mce_err->u.ue_error_type;
56 break;
57 case MCE_ERROR_TYPE_SLB:
58 mce->u.slb_error.slb_error_type = mce_err->u.slb_error_type;
59 break;
60 case MCE_ERROR_TYPE_ERAT:
61 mce->u.erat_error.erat_error_type = mce_err->u.erat_error_type;
62 break;
63 case MCE_ERROR_TYPE_TLB:
64 mce->u.tlb_error.tlb_error_type = mce_err->u.tlb_error_type;
65 break;
66 case MCE_ERROR_TYPE_USER:
67 mce->u.user_error.user_error_type = mce_err->u.user_error_type;
68 break;
69 case MCE_ERROR_TYPE_RA:
70 mce->u.ra_error.ra_error_type = mce_err->u.ra_error_type;
71 break;
72 case MCE_ERROR_TYPE_LINK:
73 mce->u.link_error.link_error_type = mce_err->u.link_error_type;
74 break;
75 case MCE_ERROR_TYPE_UNKNOWN:
76 default:
77 break;
78 }
79}
80
81void mce_irq_work_queue(void)
82{
83 /* Raise decrementer interrupt */
84 arch_irq_work_raise();
85 set_mce_pending_irq_work();
86}
87
88/*
89 * Decode and save high level MCE information into per cpu buffer which
90 * is an array of machine_check_event structure.
91 */
92void save_mce_event(struct pt_regs *regs, long handled,
93 struct mce_error_info *mce_err,
94 uint64_t nip, uint64_t addr, uint64_t phys_addr)
95{
96 int index = local_paca->mce_info->mce_nest_count++;
97 struct machine_check_event *mce;
98
99 mce = &local_paca->mce_info->mce_event[index];
100 /*
101 * Return if we don't have enough space to log mce event.
102 * mce_nest_count may go beyond MAX_MC_EVT but that's ok,
103 * the check below will stop buffer overrun.
104 */
105 if (index >= MAX_MC_EVT)
106 return;
107
108 /* Populate generic machine check info */
109 mce->version = MCE_V1;
110 mce->srr0 = nip;
111 mce->srr1 = regs->msr;
112 mce->gpr3 = regs->gpr[3];
113 mce->in_use = 1;
114 mce->cpu = get_paca()->paca_index;
115
116 /* Mark it recovered if we have handled it and MSR(RI=1). */
117 if (handled && (regs->msr & MSR_RI))
118 mce->disposition = MCE_DISPOSITION_RECOVERED;
119 else
120 mce->disposition = MCE_DISPOSITION_NOT_RECOVERED;
121
122 mce->initiator = mce_err->initiator;
123 mce->severity = mce_err->severity;
124 mce->sync_error = mce_err->sync_error;
125 mce->error_class = mce_err->error_class;
126
127 /*
128 * Populate the mce error_type and type-specific error_type.
129 */
130 mce_set_error_info(mce, mce_err);
131 if (mce->error_type == MCE_ERROR_TYPE_UE)
132 mce->u.ue_error.ignore_event = mce_err->ignore_event;
133
134 if (!addr)
135 return;
136
137 if (mce->error_type == MCE_ERROR_TYPE_TLB) {
138 mce->u.tlb_error.effective_address_provided = true;
139 mce->u.tlb_error.effective_address = addr;
140 } else if (mce->error_type == MCE_ERROR_TYPE_SLB) {
141 mce->u.slb_error.effective_address_provided = true;
142 mce->u.slb_error.effective_address = addr;
143 } else if (mce->error_type == MCE_ERROR_TYPE_ERAT) {
144 mce->u.erat_error.effective_address_provided = true;
145 mce->u.erat_error.effective_address = addr;
146 } else if (mce->error_type == MCE_ERROR_TYPE_USER) {
147 mce->u.user_error.effective_address_provided = true;
148 mce->u.user_error.effective_address = addr;
149 } else if (mce->error_type == MCE_ERROR_TYPE_RA) {
150 mce->u.ra_error.effective_address_provided = true;
151 mce->u.ra_error.effective_address = addr;
152 } else if (mce->error_type == MCE_ERROR_TYPE_LINK) {
153 mce->u.link_error.effective_address_provided = true;
154 mce->u.link_error.effective_address = addr;
155 } else if (mce->error_type == MCE_ERROR_TYPE_UE) {
156 mce->u.ue_error.effective_address_provided = true;
157 mce->u.ue_error.effective_address = addr;
158 if (phys_addr != ULONG_MAX) {
159 mce->u.ue_error.physical_address_provided = true;
160 mce->u.ue_error.physical_address = phys_addr;
161 machine_check_ue_event(mce);
162 }
163 }
164 return;
165}
166
167/*
168 * get_mce_event:
169 * mce Pointer to machine_check_event structure to be filled.
170 * release Flag to indicate whether to free the event slot or not.
171 * 0 <= do not release the mce event. Caller will invoke
172 * release_mce_event() once event has been consumed.
173 * 1 <= release the slot.
174 *
175 * return 1 = success
176 * 0 = failure
177 *
178 * get_mce_event() will be called by platform specific machine check
179 * handle routine and in KVM.
180 * When we call get_mce_event(), we are still in interrupt context and
181 * preemption will not be scheduled until ret_from_expect() routine
182 * is called.
183 */
184int get_mce_event(struct machine_check_event *mce, bool release)
185{
186 int index = local_paca->mce_info->mce_nest_count - 1;
187 struct machine_check_event *mc_evt;
188 int ret = 0;
189
190 /* Sanity check */
191 if (index < 0)
192 return ret;
193
194 /* Check if we have MCE info to process. */
195 if (index < MAX_MC_EVT) {
196 mc_evt = &local_paca->mce_info->mce_event[index];
197 /* Copy the event structure and release the original */
198 if (mce)
199 *mce = *mc_evt;
200 if (release)
201 mc_evt->in_use = 0;
202 ret = 1;
203 }
204 /* Decrement the count to free the slot. */
205 if (release)
206 local_paca->mce_info->mce_nest_count--;
207
208 return ret;
209}
210
211void release_mce_event(void)
212{
213 get_mce_event(NULL, true);
214}
215
216static void machine_check_ue_work(void)
217{
218 schedule_work(&mce_ue_event_work);
219}
220
221/*
222 * Queue up the MCE event which then can be handled later.
223 */
224static void machine_check_ue_event(struct machine_check_event *evt)
225{
226 int index;
227
228 index = local_paca->mce_info->mce_ue_count++;
229 /* If queue is full, just return for now. */
230 if (index >= MAX_MC_EVT) {
231 local_paca->mce_info->mce_ue_count--;
232 return;
233 }
234 memcpy(&local_paca->mce_info->mce_ue_event_queue[index],
235 evt, sizeof(*evt));
236
237 /* Queue work to process this event later. */
238 mce_irq_work_queue();
239}
240
241/*
242 * Queue up the MCE event which then can be handled later.
243 */
244void machine_check_queue_event(void)
245{
246 int index;
247 struct machine_check_event evt;
248
249 if (!get_mce_event(&evt, MCE_EVENT_RELEASE))
250 return;
251
252 index = local_paca->mce_info->mce_queue_count++;
253 /* If queue is full, just return for now. */
254 if (index >= MAX_MC_EVT) {
255 local_paca->mce_info->mce_queue_count--;
256 return;
257 }
258 memcpy(&local_paca->mce_info->mce_event_queue[index],
259 &evt, sizeof(evt));
260
261 mce_irq_work_queue();
262}
263
264void mce_common_process_ue(struct pt_regs *regs,
265 struct mce_error_info *mce_err)
266{
267 const struct exception_table_entry *entry;
268
269 entry = search_kernel_exception_table(regs->nip);
270 if (entry) {
271 mce_err->ignore_event = true;
272 regs_set_return_ip(regs, extable_fixup(entry));
273 }
274}
275
276/*
277 * process pending MCE event from the mce event queue. This function will be
278 * called during syscall exit.
279 */
280static void machine_process_ue_event(struct work_struct *work)
281{
282 int index;
283 struct machine_check_event *evt;
284
285 while (local_paca->mce_info->mce_ue_count > 0) {
286 index = local_paca->mce_info->mce_ue_count - 1;
287 evt = &local_paca->mce_info->mce_ue_event_queue[index];
288 blocking_notifier_call_chain(&mce_notifier_list, 0, evt);
289#ifdef CONFIG_MEMORY_FAILURE
290 /*
291 * This should probably queued elsewhere, but
292 * oh! well
293 *
294 * Don't report this machine check because the caller has a
295 * asked us to ignore the event, it has a fixup handler which
296 * will do the appropriate error handling and reporting.
297 */
298 if (evt->error_type == MCE_ERROR_TYPE_UE) {
299 if (evt->u.ue_error.ignore_event) {
300 local_paca->mce_info->mce_ue_count--;
301 continue;
302 }
303
304 if (evt->u.ue_error.physical_address_provided) {
305 unsigned long pfn;
306
307 pfn = evt->u.ue_error.physical_address >>
308 PAGE_SHIFT;
309 memory_failure(pfn, 0);
310 } else
311 pr_warn("Failed to identify bad address from "
312 "where the uncorrectable error (UE) "
313 "was generated\n");
314 }
315#endif
316 local_paca->mce_info->mce_ue_count--;
317 }
318}
319/*
320 * process pending MCE event from the mce event queue. This function will be
321 * called during syscall exit.
322 */
323static void machine_check_process_queued_event(void)
324{
325 int index;
326 struct machine_check_event *evt;
327
328 add_taint(TAINT_MACHINE_CHECK, LOCKDEP_NOW_UNRELIABLE);
329
330 /*
331 * For now just print it to console.
332 * TODO: log this error event to FSP or nvram.
333 */
334 while (local_paca->mce_info->mce_queue_count > 0) {
335 index = local_paca->mce_info->mce_queue_count - 1;
336 evt = &local_paca->mce_info->mce_event_queue[index];
337
338 if (evt->error_type == MCE_ERROR_TYPE_UE &&
339 evt->u.ue_error.ignore_event) {
340 local_paca->mce_info->mce_queue_count--;
341 continue;
342 }
343 machine_check_print_event_info(evt, false, false);
344 local_paca->mce_info->mce_queue_count--;
345 }
346}
347
348void set_mce_pending_irq_work(void)
349{
350 local_paca->mce_pending_irq_work = 1;
351}
352
353void clear_mce_pending_irq_work(void)
354{
355 local_paca->mce_pending_irq_work = 0;
356}
357
358void mce_run_irq_context_handlers(void)
359{
360 if (unlikely(local_paca->mce_pending_irq_work)) {
361 if (ppc_md.machine_check_log_err)
362 ppc_md.machine_check_log_err();
363 machine_check_process_queued_event();
364 machine_check_ue_work();
365 clear_mce_pending_irq_work();
366 }
367}
368
369void machine_check_print_event_info(struct machine_check_event *evt,
370 bool user_mode, bool in_guest)
371{
372 const char *level, *sevstr, *subtype, *err_type, *initiator;
373 uint64_t ea = 0, pa = 0;
374 int n = 0;
375 char dar_str[50];
376 char pa_str[50];
377 static const char *mc_ue_types[] = {
378 "Indeterminate",
379 "Instruction fetch",
380 "Page table walk ifetch",
381 "Load/Store",
382 "Page table walk Load/Store",
383 };
384 static const char *mc_slb_types[] = {
385 "Indeterminate",
386 "Parity",
387 "Multihit",
388 };
389 static const char *mc_erat_types[] = {
390 "Indeterminate",
391 "Parity",
392 "Multihit",
393 };
394 static const char *mc_tlb_types[] = {
395 "Indeterminate",
396 "Parity",
397 "Multihit",
398 };
399 static const char *mc_user_types[] = {
400 "Indeterminate",
401 "tlbie(l) invalid",
402 "scv invalid",
403 };
404 static const char *mc_ra_types[] = {
405 "Indeterminate",
406 "Instruction fetch (bad)",
407 "Instruction fetch (foreign/control memory)",
408 "Page table walk ifetch (bad)",
409 "Page table walk ifetch (foreign/control memory)",
410 "Load (bad)",
411 "Store (bad)",
412 "Page table walk Load/Store (bad)",
413 "Page table walk Load/Store (foreign/control memory)",
414 "Load/Store (foreign/control memory)",
415 };
416 static const char *mc_link_types[] = {
417 "Indeterminate",
418 "Instruction fetch (timeout)",
419 "Page table walk ifetch (timeout)",
420 "Load (timeout)",
421 "Store (timeout)",
422 "Page table walk Load/Store (timeout)",
423 };
424 static const char *mc_error_class[] = {
425 "Unknown",
426 "Hardware error",
427 "Probable Hardware error (some chance of software cause)",
428 "Software error",
429 "Probable Software error (some chance of hardware cause)",
430 };
431
432 /* Print things out */
433 if (evt->version != MCE_V1) {
434 pr_err("Machine Check Exception, Unknown event version %d !\n",
435 evt->version);
436 return;
437 }
438 switch (evt->severity) {
439 case MCE_SEV_NO_ERROR:
440 level = KERN_INFO;
441 sevstr = "Harmless";
442 break;
443 case MCE_SEV_WARNING:
444 level = KERN_WARNING;
445 sevstr = "Warning";
446 break;
447 case MCE_SEV_SEVERE:
448 level = KERN_ERR;
449 sevstr = "Severe";
450 break;
451 case MCE_SEV_FATAL:
452 default:
453 level = KERN_ERR;
454 sevstr = "Fatal";
455 break;
456 }
457
458 switch(evt->initiator) {
459 case MCE_INITIATOR_CPU:
460 initiator = "CPU";
461 break;
462 case MCE_INITIATOR_PCI:
463 initiator = "PCI";
464 break;
465 case MCE_INITIATOR_ISA:
466 initiator = "ISA";
467 break;
468 case MCE_INITIATOR_MEMORY:
469 initiator = "Memory";
470 break;
471 case MCE_INITIATOR_POWERMGM:
472 initiator = "Power Management";
473 break;
474 case MCE_INITIATOR_UNKNOWN:
475 default:
476 initiator = "Unknown";
477 break;
478 }
479
480 switch (evt->error_type) {
481 case MCE_ERROR_TYPE_UE:
482 err_type = "UE";
483 subtype = evt->u.ue_error.ue_error_type <
484 ARRAY_SIZE(mc_ue_types) ?
485 mc_ue_types[evt->u.ue_error.ue_error_type]
486 : "Unknown";
487 if (evt->u.ue_error.effective_address_provided)
488 ea = evt->u.ue_error.effective_address;
489 if (evt->u.ue_error.physical_address_provided)
490 pa = evt->u.ue_error.physical_address;
491 break;
492 case MCE_ERROR_TYPE_SLB:
493 err_type = "SLB";
494 subtype = evt->u.slb_error.slb_error_type <
495 ARRAY_SIZE(mc_slb_types) ?
496 mc_slb_types[evt->u.slb_error.slb_error_type]
497 : "Unknown";
498 if (evt->u.slb_error.effective_address_provided)
499 ea = evt->u.slb_error.effective_address;
500 break;
501 case MCE_ERROR_TYPE_ERAT:
502 err_type = "ERAT";
503 subtype = evt->u.erat_error.erat_error_type <
504 ARRAY_SIZE(mc_erat_types) ?
505 mc_erat_types[evt->u.erat_error.erat_error_type]
506 : "Unknown";
507 if (evt->u.erat_error.effective_address_provided)
508 ea = evt->u.erat_error.effective_address;
509 break;
510 case MCE_ERROR_TYPE_TLB:
511 err_type = "TLB";
512 subtype = evt->u.tlb_error.tlb_error_type <
513 ARRAY_SIZE(mc_tlb_types) ?
514 mc_tlb_types[evt->u.tlb_error.tlb_error_type]
515 : "Unknown";
516 if (evt->u.tlb_error.effective_address_provided)
517 ea = evt->u.tlb_error.effective_address;
518 break;
519 case MCE_ERROR_TYPE_USER:
520 err_type = "User";
521 subtype = evt->u.user_error.user_error_type <
522 ARRAY_SIZE(mc_user_types) ?
523 mc_user_types[evt->u.user_error.user_error_type]
524 : "Unknown";
525 if (evt->u.user_error.effective_address_provided)
526 ea = evt->u.user_error.effective_address;
527 break;
528 case MCE_ERROR_TYPE_RA:
529 err_type = "Real address";
530 subtype = evt->u.ra_error.ra_error_type <
531 ARRAY_SIZE(mc_ra_types) ?
532 mc_ra_types[evt->u.ra_error.ra_error_type]
533 : "Unknown";
534 if (evt->u.ra_error.effective_address_provided)
535 ea = evt->u.ra_error.effective_address;
536 break;
537 case MCE_ERROR_TYPE_LINK:
538 err_type = "Link";
539 subtype = evt->u.link_error.link_error_type <
540 ARRAY_SIZE(mc_link_types) ?
541 mc_link_types[evt->u.link_error.link_error_type]
542 : "Unknown";
543 if (evt->u.link_error.effective_address_provided)
544 ea = evt->u.link_error.effective_address;
545 break;
546 case MCE_ERROR_TYPE_DCACHE:
547 err_type = "D-Cache";
548 subtype = "Unknown";
549 break;
550 case MCE_ERROR_TYPE_ICACHE:
551 err_type = "I-Cache";
552 subtype = "Unknown";
553 break;
554 default:
555 case MCE_ERROR_TYPE_UNKNOWN:
556 err_type = "Unknown";
557 subtype = "";
558 break;
559 }
560
561 dar_str[0] = pa_str[0] = '\0';
562 if (ea && evt->srr0 != ea) {
563 /* Load/Store address */
564 n = sprintf(dar_str, "DAR: %016llx ", ea);
565 if (pa)
566 sprintf(dar_str + n, "paddr: %016llx ", pa);
567 } else if (pa) {
568 sprintf(pa_str, " paddr: %016llx", pa);
569 }
570
571 printk("%sMCE: CPU%d: machine check (%s) %s %s %s %s[%s]\n",
572 level, evt->cpu, sevstr, in_guest ? "Guest" : "",
573 err_type, subtype, dar_str,
574 evt->disposition == MCE_DISPOSITION_RECOVERED ?
575 "Recovered" : "Not recovered");
576
577 if (in_guest || user_mode) {
578 printk("%sMCE: CPU%d: PID: %d Comm: %s %sNIP: [%016llx]%s\n",
579 level, evt->cpu, current->pid, current->comm,
580 in_guest ? "Guest " : "", evt->srr0, pa_str);
581 } else {
582 printk("%sMCE: CPU%d: NIP: [%016llx] %pS%s\n",
583 level, evt->cpu, evt->srr0, (void *)evt->srr0, pa_str);
584 }
585
586 printk("%sMCE: CPU%d: Initiator %s\n", level, evt->cpu, initiator);
587
588 subtype = evt->error_class < ARRAY_SIZE(mc_error_class) ?
589 mc_error_class[evt->error_class] : "Unknown";
590 printk("%sMCE: CPU%d: %s\n", level, evt->cpu, subtype);
591
592#ifdef CONFIG_PPC_64S_HASH_MMU
593 /* Display faulty slb contents for SLB errors. */
594 if (evt->error_type == MCE_ERROR_TYPE_SLB && !in_guest)
595 slb_dump_contents(local_paca->mce_faulty_slbs);
596#endif
597}
598EXPORT_SYMBOL_GPL(machine_check_print_event_info);
599
600/*
601 * This function is called in real mode. Strictly no printk's please.
602 *
603 * regs->nip and regs->msr contains srr0 and ssr1.
604 */
605DEFINE_INTERRUPT_HANDLER_NMI(machine_check_early)
606{
607 long handled = 0;
608
609 hv_nmi_check_nonrecoverable(regs);
610
611 /*
612 * See if platform is capable of handling machine check.
613 */
614 if (ppc_md.machine_check_early)
615 handled = ppc_md.machine_check_early(regs);
616
617 return handled;
618}
619
620/* Possible meanings for HMER_DEBUG_TRIG bit being set on POWER9 */
621static enum {
622 DTRIG_UNKNOWN,
623 DTRIG_VECTOR_CI, /* need to emulate vector CI load instr */
624 DTRIG_SUSPEND_ESCAPE, /* need to escape from TM suspend mode */
625} hmer_debug_trig_function;
626
627static int init_debug_trig_function(void)
628{
629 int pvr;
630 struct device_node *cpun;
631 struct property *prop = NULL;
632 const char *str;
633
634 /* First look in the device tree */
635 preempt_disable();
636 cpun = of_get_cpu_node(smp_processor_id(), NULL);
637 if (cpun) {
638 of_property_for_each_string(cpun, "ibm,hmi-special-triggers",
639 prop, str) {
640 if (strcmp(str, "bit17-vector-ci-load") == 0)
641 hmer_debug_trig_function = DTRIG_VECTOR_CI;
642 else if (strcmp(str, "bit17-tm-suspend-escape") == 0)
643 hmer_debug_trig_function = DTRIG_SUSPEND_ESCAPE;
644 }
645 of_node_put(cpun);
646 }
647 preempt_enable();
648
649 /* If we found the property, don't look at PVR */
650 if (prop)
651 goto out;
652
653 pvr = mfspr(SPRN_PVR);
654 /* Check for POWER9 Nimbus (scale-out) */
655 if ((PVR_VER(pvr) == PVR_POWER9) && (pvr & 0xe000) == 0) {
656 /* DD2.2 and later */
657 if ((pvr & 0xfff) >= 0x202)
658 hmer_debug_trig_function = DTRIG_SUSPEND_ESCAPE;
659 /* DD2.0 and DD2.1 - used for vector CI load emulation */
660 else if ((pvr & 0xfff) >= 0x200)
661 hmer_debug_trig_function = DTRIG_VECTOR_CI;
662 }
663
664 out:
665 switch (hmer_debug_trig_function) {
666 case DTRIG_VECTOR_CI:
667 pr_debug("HMI debug trigger used for vector CI load\n");
668 break;
669 case DTRIG_SUSPEND_ESCAPE:
670 pr_debug("HMI debug trigger used for TM suspend escape\n");
671 break;
672 default:
673 break;
674 }
675 return 0;
676}
677__initcall(init_debug_trig_function);
678
679/*
680 * Handle HMIs that occur as a result of a debug trigger.
681 * Return values:
682 * -1 means this is not a HMI cause that we know about
683 * 0 means no further handling is required
684 * 1 means further handling is required
685 */
686long hmi_handle_debugtrig(struct pt_regs *regs)
687{
688 unsigned long hmer = mfspr(SPRN_HMER);
689 long ret = 0;
690
691 /* HMER_DEBUG_TRIG bit is used for various workarounds on P9 */
692 if (!((hmer & HMER_DEBUG_TRIG)
693 && hmer_debug_trig_function != DTRIG_UNKNOWN))
694 return -1;
695
696 hmer &= ~HMER_DEBUG_TRIG;
697 /* HMER is a write-AND register */
698 mtspr(SPRN_HMER, ~HMER_DEBUG_TRIG);
699
700 switch (hmer_debug_trig_function) {
701 case DTRIG_VECTOR_CI:
702 /*
703 * Now to avoid problems with soft-disable we
704 * only do the emulation if we are coming from
705 * host user space
706 */
707 if (regs && user_mode(regs))
708 ret = local_paca->hmi_p9_special_emu = 1;
709
710 break;
711
712 default:
713 break;
714 }
715
716 /*
717 * See if any other HMI causes remain to be handled
718 */
719 if (hmer & mfspr(SPRN_HMEER))
720 return -1;
721
722 return ret;
723}
724
725/*
726 * Return values:
727 */
728DEFINE_INTERRUPT_HANDLER_NMI(hmi_exception_realmode)
729{
730 int ret;
731
732 local_paca->hmi_irqs++;
733
734 ret = hmi_handle_debugtrig(regs);
735 if (ret >= 0)
736 return ret;
737
738 wait_for_subcore_guest_exit();
739
740 if (ppc_md.hmi_exception_early)
741 ppc_md.hmi_exception_early(regs);
742
743 wait_for_tb_resync();
744
745 return 1;
746}
747
748void __init mce_init(void)
749{
750 struct mce_info *mce_info;
751 u64 limit;
752 int i;
753
754 limit = min(ppc64_bolted_size(), ppc64_rma_size);
755 for_each_possible_cpu(i) {
756 mce_info = memblock_alloc_try_nid(sizeof(*mce_info),
757 __alignof__(*mce_info),
758 MEMBLOCK_LOW_LIMIT,
759 limit, early_cpu_to_node(i));
760 if (!mce_info)
761 goto err;
762 paca_ptrs[i]->mce_info = mce_info;
763 }
764 return;
765err:
766 panic("Failed to allocate memory for MCE event data\n");
767}