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powerpc/pseries: Display machine check error details. 

Extract the MCE error details from RTAS extended log and display it to
console.

With this patch you should now see mce logs like below:

[  142.371818] Severe Machine check interrupt [Recovered]
[  142.371822]   NIP [d00000000ca301b8]: init_module+0x1b8/0x338 [bork_kernel]
[  142.371822]   Initiator: CPU
[  142.371823]   Error type: SLB [Multihit]
[  142.371824]     Effective address: d00000000ca70000

Signed-off-by: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Mahesh Salgaonkar 2018-09-11 19:57:07 +05:30 committed by Michael Ellerman
parent a43c159042
commit 8f0b80561f
2 changed files with 138 additions and 0 deletions
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5
arch/powerpc/include/asm/rtas.h
View File

@ -197,6 +197,11 @@ static inline uint8_t rtas_error_extended(const struct rtas_error_log *elog)
return (elog->byte1 & 0x04) >> 2;
}
static inline uint8_t rtas_error_initiator(const struct rtas_error_log *elog)
{
return (elog->byte2 & 0xf0) >> 4;
}
#define rtas_error_type(x) ((x)->byte3)
static inline

133
arch/powerpc/platforms/pseries/ras.c
View File

@ -523,6 +523,136 @@ int pSeries_system_reset_exception(struct pt_regs *regs)
return 0; /* need to perform reset */
}
#define VAL_TO_STRING(ar, val) \
(((val) < ARRAY_SIZE(ar)) ? ar[(val)] : "Unknown")
static void pseries_print_mce_info(struct pt_regs *regs,
struct rtas_error_log *errp)
{
const char *level, *sevstr;
struct pseries_errorlog *pseries_log;
struct pseries_mc_errorlog *mce_log;
u8 error_type, err_sub_type;
u64 addr;
u8 initiator = rtas_error_initiator(errp);
int disposition = rtas_error_disposition(errp);
static const char * const initiators[] = {
"Unknown",
"CPU",
"PCI",
"ISA",
"Memory",
"Power Mgmt",
};
static const char * const mc_err_types[] = {
"UE",
"SLB",
"ERAT",
"TLB",
"D-Cache",
"Unknown",
"I-Cache",
};
static const char * const mc_ue_types[] = {
"Indeterminate",
"Instruction fetch",
"Page table walk ifetch",
"Load/Store",
"Page table walk Load/Store",
};
/* SLB sub errors valid values are 0x0, 0x1, 0x2 */
static const char * const mc_slb_types[] = {
"Parity",
"Multihit",
"Indeterminate",
};
/* TLB and ERAT sub errors valid values are 0x1, 0x2, 0x3 */
static const char * const mc_soft_types[] = {
"Unknown",
"Parity",
"Multihit",
"Indeterminate",
};
if (!rtas_error_extended(errp)) {
pr_err("Machine check interrupt: Missing extended error log\n");
return;
}
pseries_log = get_pseries_errorlog(errp, PSERIES_ELOG_SECT_ID_MCE);
if (pseries_log == NULL)
return;
mce_log = (struct pseries_mc_errorlog *)pseries_log->data;
error_type = mce_log->error_type;
err_sub_type = rtas_mc_error_sub_type(mce_log);
switch (rtas_error_severity(errp)) {
case RTAS_SEVERITY_NO_ERROR:
level = KERN_INFO;
sevstr = "Harmless";
break;
case RTAS_SEVERITY_WARNING:
level = KERN_WARNING;
sevstr = "";
break;
case RTAS_SEVERITY_ERROR:
case RTAS_SEVERITY_ERROR_SYNC:
level = KERN_ERR;
sevstr = "Severe";
break;
case RTAS_SEVERITY_FATAL:
default:
level = KERN_ERR;
sevstr = "Fatal";
break;
}
printk("%s%s Machine check interrupt [%s]\n", level, sevstr,
disposition == RTAS_DISP_FULLY_RECOVERED ?
"Recovered" : "Not recovered");
if (user_mode(regs)) {
printk("%s NIP: [%016lx] PID: %d Comm: %s\n", level,
regs->nip, current->pid, current->comm);
} else {
printk("%s NIP [%016lx]: %pS\n", level, regs->nip,
(void *)regs->nip);
}
printk("%s Initiator: %s\n", level,
VAL_TO_STRING(initiators, initiator));
switch (error_type) {
case MC_ERROR_TYPE_UE:
printk("%s Error type: %s [%s]\n", level,
VAL_TO_STRING(mc_err_types, error_type),
VAL_TO_STRING(mc_ue_types, err_sub_type));
break;
case MC_ERROR_TYPE_SLB:
printk("%s Error type: %s [%s]\n", level,
VAL_TO_STRING(mc_err_types, error_type),
VAL_TO_STRING(mc_slb_types, err_sub_type));
break;
case MC_ERROR_TYPE_ERAT:
case MC_ERROR_TYPE_TLB:
printk("%s Error type: %s [%s]\n", level,
VAL_TO_STRING(mc_err_types, error_type),
VAL_TO_STRING(mc_soft_types, err_sub_type));
break;
default:
printk("%s Error type: %s\n", level,
VAL_TO_STRING(mc_err_types, error_type));
break;
}
addr = rtas_mc_get_effective_addr(mce_log);
if (addr)
printk("%s Effective address: %016llx\n", level, addr);
}
static int mce_handle_error(struct rtas_error_log *errp)
{
struct pseries_errorlog *pseries_log;
@ -585,8 +715,11 @@ static int recover_mce(struct pt_regs *regs, struct rtas_error_log *err)
int recovered = 0;
int disposition = rtas_error_disposition(err);
pseries_print_mce_info(regs, err);
if (!(regs->msr & MSR_RI)) {
/* If MSR_RI isn't set, we cannot recover */
pr_err("Machine check interrupt unrecoverable: MSR(RI=0)\n");
recovered = 0;
} else if (disposition == RTAS_DISP_FULLY_RECOVERED) {