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Commit 51756a50 authored by Borislav Petkov's avatar Borislav Petkov
Browse files

EDAC, mce_amd_inj: Add an injector function 



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: default avatarBorislav Petkov <bp@suse.de>
parent b18f3864

drivers/edac/mce_amd_inj.c

+51 −2
Original line number Original line Diff line number Diff line
@@ -14,6 +14,7 @@ 
#include <linux/debugfs.h>

#include <linux/debugfs.h>

#include <linux/device.h>

#include <linux/device.h>

#include <linux/module.h>

#include <linux/module.h>

#include <linux/cpu.h>

#include <asm/mce.h>

#include <asm/mce.h>





#include "mce_amd.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");

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

 * This denotes into which bank we're injecting and triggers

 * the injection, at the same time.

 * the injection, at the same time.
@@ -132,8 +182,7 @@ static int inj_bank_set(void *data, u64 val) 
	}

	}





	m->bank = val;

	m->bank = val;



	do_inject();

	amd_decode_mce(NULL, 0, m);





	return 0;

	return 0;

}

}