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/* Copyright (c) 2008 by Intel Corp.
Inject machine checks into kernel for testing.
mce-inject is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public
License as published by the Free Software Foundation; version
2.
mce-inject is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should find a copy of v2 of the GNU General Public License somewhere
on your Linux system; if not, write to the Free Software Foundation,
Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
Authors:
Andi Kleen
Ying Huang
*/
#define _GNU_SOURCE 1
#include <stdio.h>
#include <sys/fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <pthread.h>
#include "mce.h"
#include "inject.h"
#include "parser.h"
#include "util.h"
#define MAX_CPU_NUM 1024
static int cpu_num;
/* map from cpu index to cpu id */
static int cpu_map[MAX_CPU_NUM];
static struct mce **cpu_mce;
void init_cpu_info(void)
{
FILE *f = fopen("/proc/cpuinfo", "r");
char *line = NULL;
size_t linesz = 0;
if (!f)
err("opening of /proc/cpuinfo");
while (getdelim(&line, &linesz, '\n', f) > 0) {
unsigned cpu;
if (sscanf(line, "processor : %u\n", &cpu) == 1)
cpu_map[cpu_num++] = cpu;
}
free(line);
fclose(f);
if (!cpu_num)
err("geting cpu ids from /proc/cpuinfo");
}
void init_inject(void)
{
cpu_mce = calloc(cpu_num, sizeof(struct mce *));
}
static inline int cpu_id_to_index(int id)
{
int i;
for (i = 0; i < cpu_num; i++)
if (cpu_map[i] == id)
return i;
err("invalid cpu id");
return -1;
}
static void write_mce(int fd, struct mce *m)
{
int n = write(fd, m, sizeof(struct mce));
if (n <= 0)
err("Injecting mce on /dev/mcelog");
if (n < sizeof(struct mce)) {
fprintf(stderr, "Short mce write %d: kernel does not match?\n",
n);
}
}
struct thread {
struct thread *next;
pthread_t thr;
struct mce *m;
struct mce otherm;
int fd;
int monarch;
};
volatile int blocked;
static void *injector(void *data)
{
struct thread *t = (struct thread *)data;
while (blocked)
barrier();
if (!t->monarch) {
int i;
for (i = 0; i < 1000000; i++);
}
write_mce(t->fd, t->m);
return NULL;
}
/* Simulate machine check broadcast. */
void do_inject_mce(int fd, struct mce *m)
{
int i;
struct mce otherm;
struct thread *tlist = NULL;
memset(&otherm, 0, sizeof(struct mce));
// make sure to trigger exception on the secondaries
otherm.mcgstatus = m->mcgstatus & MCG_STATUS_MCIP;
otherm.status = m->status & MCI_STATUS_UC;
blocked = 1;
barrier();
for (i = 0; i < cpu_num; i++) {
unsigned cpu = cpu_map[i];
struct thread *t;
pthread_attr_t attr;
cpu_set_t aset;
NEW(t);
if (cpu == m->cpu) {
t->m = m;
t->monarch = 1;
} else if (cpu_mce[i])
t->m = cpu_mce[i];
else if (mce_flags & MCE_NOBROADCAST)
continue;
else {
t->m = &t->otherm;
t->otherm = otherm;
t->otherm.cpu = cpu;
}
t->fd = fd;
t->next = tlist;
tlist = t;
pthread_attr_init(&attr);
CPU_ZERO(&aset);
CPU_SET(cpu, &aset);
if (pthread_attr_setaffinity_np(&attr, sizeof(aset), &aset))
err("pthread_attr_setaffinity");
if (pthread_create(&t->thr, &attr, injector, t))
err("pthread_create");
}
/* could wait here for the threads to start up, but the kernel timeout should
be long enough to catch slow ones */
barrier();
blocked = 0;
while (tlist) {
struct thread *next = tlist->next;
pthread_join(tlist->thr, NULL);
free(tlist);
tlist = next;
}
}
void inject_mce(struct mce *m)
{
int inject_fd;
if (mce_flags & MCE_HOLD) {
int cpu_index = cpu_id_to_index(m->cpu);
struct mce *nm;
NEW(nm);
*nm = *m;
cpu_mce[cpu_index] = nm;
return;
}
inject_fd = open("/dev/mcelog", O_RDWR);
if (inject_fd < 0)
err("opening of /dev/mcelog");
if (!(m->status & MCI_STATUS_UC))
mce_flags |= MCE_NOBROADCAST;
do_inject_mce(inject_fd, m);
close(inject_fd);
}
void dump_mce(struct mce *m)
{
printf("CPU %d\n", m->cpu);
printf("BANK %d\n", m->bank);
printf("TSC 0x%Lx\n", m->tsc);
printf("RIP 0x%02x:0x%Lx\n", m->cs, m->ip);
printf("MISC 0x%Lx\n", m->misc);
printf("ADDR 0x%Lx\n", m->addr);
printf("STATUS 0x%Lx\n", m->status);
printf("MCGSTATUS 0x%Lx\n\n", m->mcgstatus);
}
void submit_mce(struct mce *m)
{
if (do_dump)
dump_mce(m);
else
inject_mce(m);
}
void init_mce(struct mce *m)
{
memset(m, 0, sizeof(struct mce));
}
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