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EDAC, mce_amd_inj: Add an injector function

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Selectively inject either a real MCE or a sw-only version which
exercises the decoding path only. The hardware-injected MCE triggers a
machine check exception (#MC) so that the MCE handler can be bothered to
do something too.

Signed-off-by: Borislav Petkov <bp@suse.de>
This commit is contained in:
Borislav Petkov 2014-11-22 11:47:07 +01:00
parent b18f3864bf
commit 51756a5034
1 changed files with 51 additions and 2 deletions
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53
drivers/edac/mce_amd_inj.c
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@ -14,6 +14,7 @@
#include <linux/debugfs.h>
#include <linux/device.h>
#include <linux/module.h>
#include <linux/cpu.h>
#include <asm/mce.h>
#include "mce_amd.h"
@ -116,6 +117,55 @@ static int inj_extcpu_set(void *data, u64 val)
DEFINE_SIMPLE_ATTRIBUTE(extcpu_fops, inj_extcpu_get, inj_extcpu_set, "%llu\n");
static void trigger_mce(void *info)
{
asm volatile("int $18");
}
static void do_inject(void)
{
u64 mcg_status = 0;
unsigned int cpu = i_mce.extcpu;
u8 b = i_mce.bank;
if (!(i_mce.inject_flags & MCJ_EXCEPTION)) {
amd_decode_mce(NULL, 0, &i_mce);
return;
}
get_online_cpus();
if (!cpu_online(cpu))
goto err;
/* prep MCE global settings for the injection */
mcg_status = MCG_STATUS_MCIP | MCG_STATUS_EIPV;
if (!(i_mce.status & MCI_STATUS_PCC))
mcg_status |= MCG_STATUS_RIPV;
toggle_hw_mce_inject(cpu, true);
wrmsr_on_cpu(cpu, MSR_IA32_MCG_STATUS,
(u32)mcg_status, (u32)(mcg_status >> 32));
wrmsr_on_cpu(cpu, MSR_IA32_MCx_STATUS(b),
(u32)i_mce.status, (u32)(i_mce.status >> 32));
wrmsr_on_cpu(cpu, MSR_IA32_MCx_ADDR(b),
(u32)i_mce.addr, (u32)(i_mce.addr >> 32));
wrmsr_on_cpu(cpu, MSR_IA32_MCx_MISC(b),
(u32)i_mce.misc, (u32)(i_mce.misc >> 32));
toggle_hw_mce_inject(cpu, false);
smp_call_function_single(cpu, trigger_mce, NULL, 0);
err:
put_online_cpus();
}
/*
* This denotes into which bank we're injecting and triggers
* the injection, at the same time.
@ -132,8 +182,7 @@ static int inj_bank_set(void *data, u64 val)
}
m->bank = val;
amd_decode_mce(NULL, 0, m);
do_inject();
return 0;
}