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powerpc/xmon: add command to dump OPAL msglog

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Add the 'do' command to dump the OPAL msglog in xmon.

Signed-off-by: Andrew Donnellan <andrew.donnellan@au1.ibm.com>
[mpe: Reduce the amount of ifdefery required]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Andrew Donnellan 2016-02-09 18:17:49 +11:00 committed by Michael Ellerman
parent 9b4fffa149
commit fde93a0f77
1 changed files with 58 additions and 0 deletions
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58
arch/powerpc/xmon/xmon.c
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@ -47,6 +47,9 @@
#include <asm/debug.h>
#include <asm/hw_breakpoint.h>
#include <asm/opal.h>
#include <asm/firmware.h>
#ifdef CONFIG_PPC64
#include <asm/hvcall.h>
#include <asm/paca.h>
@ -119,6 +122,16 @@ static void dump(void);
static void prdump(unsigned long, long);
static int ppc_inst_dump(unsigned long, long, int);
static void dump_log_buf(void);
#ifdef CONFIG_PPC_POWERNV
static void dump_opal_msglog(void);
#else
static inline void dump_opal_msglog(void)
{
printf("Machine is not running OPAL firmware.\n");
}
#endif
static void backtrace(struct pt_regs *);
static void excprint(struct pt_regs *);
static void prregs(struct pt_regs *);
@ -202,6 +215,10 @@ Commands:\n\
df dump float values\n\
dd dump double values\n\
dl dump the kernel log buffer\n"
#ifdef CONFIG_PPC_POWERNV
"\
do dump the OPAL message log\n"
#endif
#ifdef CONFIG_PPC64
"\
dp[#] dump paca for current cpu, or cpu #\n\
@ -2253,6 +2270,8 @@ dump(void)
last_cmd = "di\n";
} else if (c == 'l') {
dump_log_buf();
} else if (c == 'o') {
dump_opal_msglog();
} else if (c == 'r') {
scanhex(&ndump);
if (ndump == 0)
@ -2395,6 +2414,45 @@ dump_log_buf(void)
catch_memory_errors = 0;
}
#ifdef CONFIG_PPC_POWERNV
static void dump_opal_msglog(void)
{
unsigned char buf[128];
ssize_t res;
loff_t pos = 0;
if (!firmware_has_feature(FW_FEATURE_OPAL)) {
printf("Machine is not running OPAL firmware.\n");
return;
}
if (setjmp(bus_error_jmp) != 0) {
printf("Error dumping OPAL msglog!\n");
return;
}
catch_memory_errors = 1;
sync();
xmon_start_pagination();
while ((res = opal_msglog_copy(buf, pos, sizeof(buf) - 1))) {
if (res < 0) {
printf("Error dumping OPAL msglog! Error: %zd\n", res);
break;
}
buf[res] = '\0';
printf("%s", buf);
pos += res;
}
xmon_end_pagination();
sync();
/* wait a little while to see if we get a machine check */
__delay(200);
catch_memory_errors = 0;
}
#endif
/*
* Memory operations - move, set, print differences
*/