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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2022 Intel Corporation
* Author: Tony Luck
*
* This software may be redistributed and/or modified under the terms of
* the GNU General Public License ("GPL") version 2 only as published by the
* Free Software Foundation.
*/
/*
* Allocate memory - loop using EINJ to inject a soft error,
* consuming after each until the page is taken offline.
*/
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/mman.h>
#define EINJ_ETYPE "/sys/kernel/debug/apei/einj/error_type"
#define EINJ_ADDR "/sys/kernel/debug/apei/einj/param1"
#define EINJ_MASK "/sys/kernel/debug/apei/einj/param2"
#define EINJ_NOTRIGGER "/sys/kernel/debug/apei/einj/notrigger"
#define EINJ_DOIT "/sys/kernel/debug/apei/einj/error_inject"
volatile int trigger;
extern unsigned long long vtop(unsigned long long addr);
static void wfile(char *file, unsigned long val)
{
FILE *fp;
fp = fopen(file, "w");
if (fp == NULL) {
perror(file);
exit(1);
}
fprintf(fp, "0x%lx\n", val);
if (fclose(fp) == EOF) {
perror(file);
exit(1);
}
}
#define MAX_TRIES 30
int main(int argc, char **argv)
{
char *addr = mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_SHARED|MAP_ANONYMOUS, -1, 0);
unsigned long long paddr;
int tries = MAX_TRIES;
int i;
if (argc == 2)
tries = atoi(argv[1]);
if (addr == MAP_FAILED) {
perror("mmap");
return 1;
}
wfile(EINJ_ETYPE, 0x8);
wfile(EINJ_MASK, ~0x0ul);
wfile(EINJ_NOTRIGGER, 1);
*addr = '*';
paddr = vtop((unsigned long long)addr);
for (i = 0; i < tries; i++) {
printf("%d: Inject to vaddr=%p paddr=0x%llx\n", i, addr, paddr);
wfile(EINJ_ADDR, paddr);
wfile(EINJ_DOIT, 1);
usleep(250);
trigger += *addr;
sleep(2);
if (paddr != vtop((unsigned long long)addr))
break;
}
if (i == tries) {
fprintf(stderr, "FAIL: Page was not offline after %d errors\n", i);
return 1;
}
printf("PASS: page taken offline after %d corrected errors\n", i + 1);
return 0;
}
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