2 * Copyright (C) 2001 Dave Engebretsen IBM Corporation
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 #include <linux/sched.h>
20 #include <linux/interrupt.h>
21 #include <linux/irq.h>
24 #include <linux/reboot.h>
25 #include <linux/irq_work.h>
27 #include <asm/machdep.h>
29 #include <asm/firmware.h>
34 static unsigned char ras_log_buf
[RTAS_ERROR_LOG_MAX
];
35 static DEFINE_SPINLOCK(ras_log_buf_lock
);
37 static int ras_check_exception_token
;
39 static void mce_process_errlog_event(struct irq_work
*work
);
40 static struct irq_work mce_errlog_process_work
= {
41 .func
= mce_process_errlog_event
,
44 #define EPOW_SENSOR_TOKEN 9
45 #define EPOW_SENSOR_INDEX 0
47 /* EPOW events counter variable */
48 static int num_epow_events
;
50 static irqreturn_t
ras_hotplug_interrupt(int irq
, void *dev_id
);
51 static irqreturn_t
ras_epow_interrupt(int irq
, void *dev_id
);
52 static irqreturn_t
ras_error_interrupt(int irq
, void *dev_id
);
54 /* RTAS pseries MCE errorlog section. */
55 struct pseries_mc_errorlog
{
60 * sub_err_type (1 byte). Bit fields depends on error_type
68 * For error_type == MC_ERROR_TYPE_UE
70 * X 1: Permanent or Transient UE.
71 * X 1: Effective address provided.
72 * X 1: Logical address provided.
74 * XXX 3: Type of UE error.
76 * For error_type != MC_ERROR_TYPE_UE
78 * X 1: Effective address provided.
80 * XX 2: Type of SLB/ERAT/TLB error.
84 __be64 effective_address
;
85 __be64 logical_address
;
88 /* RTAS pseries MCE error types */
89 #define MC_ERROR_TYPE_UE 0x00
90 #define MC_ERROR_TYPE_SLB 0x01
91 #define MC_ERROR_TYPE_ERAT 0x02
92 #define MC_ERROR_TYPE_TLB 0x04
93 #define MC_ERROR_TYPE_D_CACHE 0x05
94 #define MC_ERROR_TYPE_I_CACHE 0x07
96 /* RTAS pseries MCE error sub types */
97 #define MC_ERROR_UE_INDETERMINATE 0
98 #define MC_ERROR_UE_IFETCH 1
99 #define MC_ERROR_UE_PAGE_TABLE_WALK_IFETCH 2
100 #define MC_ERROR_UE_LOAD_STORE 3
101 #define MC_ERROR_UE_PAGE_TABLE_WALK_LOAD_STORE 4
103 #define MC_ERROR_SLB_PARITY 0
104 #define MC_ERROR_SLB_MULTIHIT 1
105 #define MC_ERROR_SLB_INDETERMINATE 2
107 #define MC_ERROR_ERAT_PARITY 1
108 #define MC_ERROR_ERAT_MULTIHIT 2
109 #define MC_ERROR_ERAT_INDETERMINATE 3
111 #define MC_ERROR_TLB_PARITY 1
112 #define MC_ERROR_TLB_MULTIHIT 2
113 #define MC_ERROR_TLB_INDETERMINATE 3
115 static inline u8
rtas_mc_error_sub_type(const struct pseries_mc_errorlog
*mlog
)
117 switch (mlog
->error_type
) {
118 case MC_ERROR_TYPE_UE
:
119 return (mlog
->sub_err_type
& 0x07);
120 case MC_ERROR_TYPE_SLB
:
121 case MC_ERROR_TYPE_ERAT
:
122 case MC_ERROR_TYPE_TLB
:
123 return (mlog
->sub_err_type
& 0x03);
130 inline u64
rtas_mc_get_effective_addr(const struct pseries_mc_errorlog
*mlog
)
134 switch (mlog
->error_type
) {
135 case MC_ERROR_TYPE_UE
:
136 if (mlog
->sub_err_type
& 0x40)
137 addr
= mlog
->effective_address
;
139 case MC_ERROR_TYPE_SLB
:
140 case MC_ERROR_TYPE_ERAT
:
141 case MC_ERROR_TYPE_TLB
:
142 if (mlog
->sub_err_type
& 0x80)
143 addr
= mlog
->effective_address
;
147 return be64_to_cpu(addr
);
151 * Enable the hotplug interrupt late because processing them may touch other
152 * devices or systems (e.g. hugepages) that have not been initialized at the
155 int __init
init_ras_hotplug_IRQ(void)
157 struct device_node
*np
;
160 np
= of_find_node_by_path("/event-sources/hot-plug-events");
162 if (dlpar_workqueue_init() == 0)
163 request_event_sources_irqs(np
, ras_hotplug_interrupt
,
170 machine_late_initcall(pseries
, init_ras_hotplug_IRQ
);
173 * Initialize handlers for the set of interrupts caused by hardware errors
174 * and power system events.
176 static int __init
init_ras_IRQ(void)
178 struct device_node
*np
;
180 ras_check_exception_token
= rtas_token("check-exception");
182 /* Internal Errors */
183 np
= of_find_node_by_path("/event-sources/internal-errors");
185 request_event_sources_irqs(np
, ras_error_interrupt
,
191 np
= of_find_node_by_path("/event-sources/epow-events");
193 request_event_sources_irqs(np
, ras_epow_interrupt
, "RAS_EPOW");
199 machine_subsys_initcall(pseries
, init_ras_IRQ
);
201 #define EPOW_SHUTDOWN_NORMAL 1
202 #define EPOW_SHUTDOWN_ON_UPS 2
203 #define EPOW_SHUTDOWN_LOSS_OF_CRITICAL_FUNCTIONS 3
204 #define EPOW_SHUTDOWN_AMBIENT_TEMPERATURE_TOO_HIGH 4
206 static void handle_system_shutdown(char event_modifier
)
208 switch (event_modifier
) {
209 case EPOW_SHUTDOWN_NORMAL
:
210 pr_emerg("Power off requested\n");
211 orderly_poweroff(true);
214 case EPOW_SHUTDOWN_ON_UPS
:
215 pr_emerg("Loss of system power detected. System is running on"
216 " UPS/battery. Check RTAS error log for details\n");
217 orderly_poweroff(true);
220 case EPOW_SHUTDOWN_LOSS_OF_CRITICAL_FUNCTIONS
:
221 pr_emerg("Loss of system critical functions detected. Check"
222 " RTAS error log for details\n");
223 orderly_poweroff(true);
226 case EPOW_SHUTDOWN_AMBIENT_TEMPERATURE_TOO_HIGH
:
227 pr_emerg("High ambient temperature detected. Check RTAS"
228 " error log for details\n");
229 orderly_poweroff(true);
233 pr_err("Unknown power/cooling shutdown event (modifier = %d)\n",
238 struct epow_errorlog
{
239 unsigned char sensor_value
;
240 unsigned char event_modifier
;
241 unsigned char extended_modifier
;
242 unsigned char reserved
;
243 unsigned char platform_reason
;
247 #define EPOW_WARN_COOLING 1
248 #define EPOW_WARN_POWER 2
249 #define EPOW_SYSTEM_SHUTDOWN 3
250 #define EPOW_SYSTEM_HALT 4
251 #define EPOW_MAIN_ENCLOSURE 5
252 #define EPOW_POWER_OFF 7
254 static void rtas_parse_epow_errlog(struct rtas_error_log
*log
)
256 struct pseries_errorlog
*pseries_log
;
257 struct epow_errorlog
*epow_log
;
261 pseries_log
= get_pseries_errorlog(log
, PSERIES_ELOG_SECT_ID_EPOW
);
262 if (pseries_log
== NULL
)
265 epow_log
= (struct epow_errorlog
*)pseries_log
->data
;
266 action_code
= epow_log
->sensor_value
& 0xF; /* bottom 4 bits */
267 modifier
= epow_log
->event_modifier
& 0xF; /* bottom 4 bits */
269 switch (action_code
) {
271 if (num_epow_events
) {
272 pr_info("Non critical power/cooling issue cleared\n");
277 case EPOW_WARN_COOLING
:
278 pr_info("Non-critical cooling issue detected. Check RTAS error"
279 " log for details\n");
282 case EPOW_WARN_POWER
:
283 pr_info("Non-critical power issue detected. Check RTAS error"
284 " log for details\n");
287 case EPOW_SYSTEM_SHUTDOWN
:
288 handle_system_shutdown(epow_log
->event_modifier
);
291 case EPOW_SYSTEM_HALT
:
292 pr_emerg("Critical power/cooling issue detected. Check RTAS"
293 " error log for details. Powering off.\n");
294 orderly_poweroff(true);
297 case EPOW_MAIN_ENCLOSURE
:
299 pr_emerg("System about to lose power. Check RTAS error log "
300 " for details. Powering off immediately.\n");
306 pr_err("Unknown power/cooling event (action code = %d)\n",
310 /* Increment epow events counter variable */
311 if (action_code
!= EPOW_RESET
)
315 static irqreturn_t
ras_hotplug_interrupt(int irq
, void *dev_id
)
317 struct pseries_errorlog
*pseries_log
;
318 struct pseries_hp_errorlog
*hp_elog
;
320 spin_lock(&ras_log_buf_lock
);
322 rtas_call(ras_check_exception_token
, 6, 1, NULL
,
323 RTAS_VECTOR_EXTERNAL_INTERRUPT
, virq_to_hw(irq
),
324 RTAS_HOTPLUG_EVENTS
, 0, __pa(&ras_log_buf
),
325 rtas_get_error_log_max());
327 pseries_log
= get_pseries_errorlog((struct rtas_error_log
*)ras_log_buf
,
328 PSERIES_ELOG_SECT_ID_HOTPLUG
);
329 hp_elog
= (struct pseries_hp_errorlog
*)pseries_log
->data
;
332 * Since PCI hotplug is not currently supported on pseries, put PCI
333 * hotplug events on the ras_log_buf to be handled by rtas_errd.
335 if (hp_elog
->resource
== PSERIES_HP_ELOG_RESOURCE_MEM
||
336 hp_elog
->resource
== PSERIES_HP_ELOG_RESOURCE_CPU
||
337 hp_elog
->resource
== PSERIES_HP_ELOG_RESOURCE_PMEM
)
338 queue_hotplug_event(hp_elog
);
340 log_error(ras_log_buf
, ERR_TYPE_RTAS_LOG
, 0);
342 spin_unlock(&ras_log_buf_lock
);
346 /* Handle environmental and power warning (EPOW) interrupts. */
347 static irqreturn_t
ras_epow_interrupt(int irq
, void *dev_id
)
353 status
= rtas_get_sensor_fast(EPOW_SENSOR_TOKEN
, EPOW_SENSOR_INDEX
,
357 critical
= 1; /* Time Critical */
361 spin_lock(&ras_log_buf_lock
);
363 status
= rtas_call(ras_check_exception_token
, 6, 1, NULL
,
364 RTAS_VECTOR_EXTERNAL_INTERRUPT
,
367 critical
, __pa(&ras_log_buf
),
368 rtas_get_error_log_max());
370 log_error(ras_log_buf
, ERR_TYPE_RTAS_LOG
, 0);
372 rtas_parse_epow_errlog((struct rtas_error_log
*)ras_log_buf
);
374 spin_unlock(&ras_log_buf_lock
);
379 * Handle hardware error interrupts.
381 * RTAS check-exception is called to collect data on the exception. If
382 * the error is deemed recoverable, we log a warning and return.
383 * For nonrecoverable errors, an error is logged and we stop all processing
384 * as quickly as possible in order to prevent propagation of the failure.
386 static irqreturn_t
ras_error_interrupt(int irq
, void *dev_id
)
388 struct rtas_error_log
*rtas_elog
;
392 spin_lock(&ras_log_buf_lock
);
394 status
= rtas_call(ras_check_exception_token
, 6, 1, NULL
,
395 RTAS_VECTOR_EXTERNAL_INTERRUPT
,
397 RTAS_INTERNAL_ERROR
, 1 /* Time Critical */,
399 rtas_get_error_log_max());
401 rtas_elog
= (struct rtas_error_log
*)ras_log_buf
;
404 rtas_error_severity(rtas_elog
) >= RTAS_SEVERITY_ERROR_SYNC
)
409 /* format and print the extended information */
410 log_error(ras_log_buf
, ERR_TYPE_RTAS_LOG
, fatal
);
413 pr_emerg("Fatal hardware error detected. Check RTAS error"
414 " log for details. Powering off immediately\n");
418 pr_err("Recoverable hardware error detected\n");
421 spin_unlock(&ras_log_buf_lock
);
426 * Some versions of FWNMI place the buffer inside the 4kB page starting at
427 * 0x7000. Other versions place it inside the rtas buffer. We check both.
429 #define VALID_FWNMI_BUFFER(A) \
430 ((((A) >= 0x7000) && ((A) < 0x7ff0)) || \
431 (((A) >= rtas.base) && ((A) < (rtas.base + rtas.size - 16))))
433 static inline struct rtas_error_log
*fwnmi_get_errlog(void)
435 return (struct rtas_error_log
*)local_paca
->mce_data_buf
;
439 * Get the error information for errors coming through the
440 * FWNMI vectors. The pt_regs' r3 will be updated to reflect
441 * the actual r3 if possible, and a ptr to the error log entry
442 * will be returned if found.
444 * Use one buffer mce_data_buf per cpu to store RTAS error.
446 * The mce_data_buf does not have any locks or protection around it,
447 * if a second machine check comes in, or a system reset is done
448 * before we have logged the error, then we will get corruption in the
449 * error log. This is preferable over holding off on calling
450 * ibm,nmi-interlock which would result in us checkstopping if a
451 * second machine check did come in.
453 static struct rtas_error_log
*fwnmi_get_errinfo(struct pt_regs
*regs
)
455 unsigned long *savep
;
456 struct rtas_error_log
*h
;
458 /* Mask top two bits */
459 regs
->gpr
[3] &= ~(0x3UL
<< 62);
461 if (!VALID_FWNMI_BUFFER(regs
->gpr
[3])) {
462 printk(KERN_ERR
"FWNMI: corrupt r3 0x%016lx\n", regs
->gpr
[3]);
466 savep
= __va(regs
->gpr
[3]);
467 regs
->gpr
[3] = be64_to_cpu(savep
[0]); /* restore original r3 */
469 h
= (struct rtas_error_log
*)&savep
[1];
470 /* Use the per cpu buffer from paca to store rtas error log */
471 memset(local_paca
->mce_data_buf
, 0, RTAS_ERROR_LOG_MAX
);
472 if (!rtas_error_extended(h
)) {
473 memcpy(local_paca
->mce_data_buf
, h
, sizeof(__u64
));
475 int len
, error_log_length
;
477 error_log_length
= 8 + rtas_error_extended_log_length(h
);
478 len
= min_t(int, error_log_length
, RTAS_ERROR_LOG_MAX
);
479 memcpy(local_paca
->mce_data_buf
, h
, len
);
482 return (struct rtas_error_log
*)local_paca
->mce_data_buf
;
485 /* Call this when done with the data returned by FWNMI_get_errinfo.
486 * It will release the saved data area for other CPUs in the
487 * partition to receive FWNMI errors.
489 static void fwnmi_release_errinfo(void)
491 int ret
= rtas_call(rtas_token("ibm,nmi-interlock"), 0, 1, NULL
);
493 printk(KERN_ERR
"FWNMI: nmi-interlock failed: %d\n", ret
);
496 int pSeries_system_reset_exception(struct pt_regs
*regs
)
498 #ifdef __LITTLE_ENDIAN__
500 * Some firmware byteswaps SRR registers and gives incorrect SRR1. Try
501 * to detect the bad SRR1 pattern here. Flip the NIP back to correct
502 * endian for reporting purposes. Unfortunately the MSR can't be fixed,
503 * so clear it. It will be missing MSR_RI so we won't try to recover.
505 if ((be64_to_cpu(regs
->msr
) &
506 (MSR_LE
|MSR_RI
|MSR_DR
|MSR_IR
|MSR_ME
|MSR_PR
|
507 MSR_ILE
|MSR_HV
|MSR_SF
)) == (MSR_DR
|MSR_SF
)) {
508 regs
->nip
= be64_to_cpu((__be64
)regs
->nip
);
514 struct rtas_error_log
*errhdr
= fwnmi_get_errinfo(regs
);
516 /* XXX Should look at FWNMI information */
518 fwnmi_release_errinfo();
521 if (smp_handle_nmi_ipi(regs
))
524 return 0; /* need to perform reset */
527 #define VAL_TO_STRING(ar, val) \
528 (((val) < ARRAY_SIZE(ar)) ? ar[(val)] : "Unknown")
530 static void pseries_print_mce_info(struct pt_regs
*regs
,
531 struct rtas_error_log
*errp
)
533 const char *level
, *sevstr
;
534 struct pseries_errorlog
*pseries_log
;
535 struct pseries_mc_errorlog
*mce_log
;
536 u8 error_type
, err_sub_type
;
538 u8 initiator
= rtas_error_initiator(errp
);
539 int disposition
= rtas_error_disposition(errp
);
541 static const char * const initiators
[] = {
549 static const char * const mc_err_types
[] = {
559 static const char * const mc_ue_types
[] = {
562 "Page table walk ifetch",
564 "Page table walk Load/Store",
567 /* SLB sub errors valid values are 0x0, 0x1, 0x2 */
568 static const char * const mc_slb_types
[] = {
574 /* TLB and ERAT sub errors valid values are 0x1, 0x2, 0x3 */
575 static const char * const mc_soft_types
[] = {
582 if (!rtas_error_extended(errp
)) {
583 pr_err("Machine check interrupt: Missing extended error log\n");
587 pseries_log
= get_pseries_errorlog(errp
, PSERIES_ELOG_SECT_ID_MCE
);
588 if (pseries_log
== NULL
)
591 mce_log
= (struct pseries_mc_errorlog
*)pseries_log
->data
;
593 error_type
= mce_log
->error_type
;
594 err_sub_type
= rtas_mc_error_sub_type(mce_log
);
596 switch (rtas_error_severity(errp
)) {
597 case RTAS_SEVERITY_NO_ERROR
:
601 case RTAS_SEVERITY_WARNING
:
602 level
= KERN_WARNING
;
605 case RTAS_SEVERITY_ERROR
:
606 case RTAS_SEVERITY_ERROR_SYNC
:
610 case RTAS_SEVERITY_FATAL
:
617 #ifdef CONFIG_PPC_BOOK3S_64
618 /* Display faulty slb contents for SLB errors. */
619 if (error_type
== MC_ERROR_TYPE_SLB
)
620 slb_dump_contents(local_paca
->mce_faulty_slbs
);
623 printk("%s%s Machine check interrupt [%s]\n", level
, sevstr
,
624 disposition
== RTAS_DISP_FULLY_RECOVERED
?
625 "Recovered" : "Not recovered");
626 if (user_mode(regs
)) {
627 printk("%s NIP: [%016lx] PID: %d Comm: %s\n", level
,
628 regs
->nip
, current
->pid
, current
->comm
);
630 printk("%s NIP [%016lx]: %pS\n", level
, regs
->nip
,
633 printk("%s Initiator: %s\n", level
,
634 VAL_TO_STRING(initiators
, initiator
));
636 switch (error_type
) {
637 case MC_ERROR_TYPE_UE
:
638 printk("%s Error type: %s [%s]\n", level
,
639 VAL_TO_STRING(mc_err_types
, error_type
),
640 VAL_TO_STRING(mc_ue_types
, err_sub_type
));
642 case MC_ERROR_TYPE_SLB
:
643 printk("%s Error type: %s [%s]\n", level
,
644 VAL_TO_STRING(mc_err_types
, error_type
),
645 VAL_TO_STRING(mc_slb_types
, err_sub_type
));
647 case MC_ERROR_TYPE_ERAT
:
648 case MC_ERROR_TYPE_TLB
:
649 printk("%s Error type: %s [%s]\n", level
,
650 VAL_TO_STRING(mc_err_types
, error_type
),
651 VAL_TO_STRING(mc_soft_types
, err_sub_type
));
654 printk("%s Error type: %s\n", level
,
655 VAL_TO_STRING(mc_err_types
, error_type
));
659 addr
= rtas_mc_get_effective_addr(mce_log
);
661 printk("%s Effective address: %016llx\n", level
, addr
);
664 static int mce_handle_error(struct rtas_error_log
*errp
)
666 struct pseries_errorlog
*pseries_log
;
667 struct pseries_mc_errorlog
*mce_log
;
668 int disposition
= rtas_error_disposition(errp
);
671 if (!rtas_error_extended(errp
))
674 pseries_log
= get_pseries_errorlog(errp
, PSERIES_ELOG_SECT_ID_MCE
);
675 if (pseries_log
== NULL
)
678 mce_log
= (struct pseries_mc_errorlog
*)pseries_log
->data
;
679 error_type
= mce_log
->error_type
;
681 #ifdef CONFIG_PPC_BOOK3S_64
682 if (disposition
== RTAS_DISP_NOT_RECOVERED
) {
683 switch (error_type
) {
684 case MC_ERROR_TYPE_SLB
:
685 case MC_ERROR_TYPE_ERAT
:
687 * Store the old slb content in paca before flushing.
688 * Print this when we go to virtual mode.
689 * There are chances that we may hit MCE again if there
690 * is a parity error on the SLB entry we trying to read
691 * for saving. Hence limit the slb saving to single
692 * level of recursion.
694 if (local_paca
->in_mce
== 1)
695 slb_save_contents(local_paca
->mce_faulty_slbs
);
696 flush_and_reload_slb();
697 disposition
= RTAS_DISP_FULLY_RECOVERED
;
698 rtas_set_disposition_recovered(errp
);
711 * Process MCE rtas errlog event.
713 static void mce_process_errlog_event(struct irq_work
*work
)
715 struct rtas_error_log
*err
;
717 err
= fwnmi_get_errlog();
718 log_error((char *)err
, ERR_TYPE_RTAS_LOG
, 0);
722 * See if we can recover from a machine check exception.
723 * This is only called on power4 (or above) and only via
724 * the Firmware Non-Maskable Interrupts (fwnmi) handler
725 * which provides the error analysis for us.
727 * Return 1 if corrected (or delivered a signal).
728 * Return 0 if there is nothing we can do.
730 static int recover_mce(struct pt_regs
*regs
, struct rtas_error_log
*err
)
733 int disposition
= rtas_error_disposition(err
);
735 pseries_print_mce_info(regs
, err
);
737 if (!(regs
->msr
& MSR_RI
)) {
738 /* If MSR_RI isn't set, we cannot recover */
739 pr_err("Machine check interrupt unrecoverable: MSR(RI=0)\n");
742 } else if (disposition
== RTAS_DISP_FULLY_RECOVERED
) {
743 /* Platform corrected itself */
746 } else if (disposition
== RTAS_DISP_LIMITED_RECOVERY
) {
747 /* Platform corrected itself but could be degraded */
748 printk(KERN_ERR
"MCE: limited recovery, system may "
752 } else if (user_mode(regs
) && !is_global_init(current
) &&
753 rtas_error_severity(err
) == RTAS_SEVERITY_ERROR_SYNC
) {
756 * If we received a synchronous error when in userspace
757 * kill the task. Firmware may report details of the fail
758 * asynchronously, so we can't rely on the target and type
759 * fields being valid here.
761 printk(KERN_ERR
"MCE: uncorrectable error, killing task "
762 "%s:%d\n", current
->comm
, current
->pid
);
764 _exception(SIGBUS
, regs
, BUS_MCEERR_AR
, regs
->nip
);
768 /* Queue irq work to log this rtas event later. */
769 irq_work_queue(&mce_errlog_process_work
);
775 * Handle a machine check.
777 * Note that on Power 4 and beyond Firmware Non-Maskable Interrupts (fwnmi)
778 * should be present. If so the handler which called us tells us if the
779 * error was recovered (never true if RI=0).
781 * On hardware prior to Power 4 these exceptions were asynchronous which
782 * means we can't tell exactly where it occurred and so we can't recover.
784 int pSeries_machine_check_exception(struct pt_regs
*regs
)
786 struct rtas_error_log
*errp
;
789 fwnmi_release_errinfo();
790 errp
= fwnmi_get_errlog();
791 if (errp
&& recover_mce(regs
, errp
))
798 long pseries_machine_check_realmode(struct pt_regs
*regs
)
800 struct rtas_error_log
*errp
;
804 errp
= fwnmi_get_errinfo(regs
);
806 * Call to fwnmi_release_errinfo() in real mode causes kernel
807 * to panic. Hence we will call it as soon as we go into
810 disposition
= mce_handle_error(errp
);
811 if (disposition
== RTAS_DISP_FULLY_RECOVERED
)