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/* Copyright (C) 2008 Intel Corporation
Author: Andi Kleen
Parse sysfs exported CPU cache topology
mcelog 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.
mcelog 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 */
#define _GNU_SOURCE 1
#include <string.h>
#include <dirent.h>
#include <stdio.h>
#include <sys/stat.h>
#include <assert.h>
#include <ctype.h>
#include "mcelog.h"
#include "memutil.h"
#include "sysfs.h"
#include "cache.h"
struct cache {
unsigned level;
/* Numerical values must match MCACOD */
enum { INSTR, DATA, UNIFIED } type;
unsigned *cpumap;
unsigned cpumaplen;
};
struct cache **caches;
static unsigned cachelen;
#define PREFIX "/sys/devices/system/cpu"
#define MIN_CPUS 8
#define MIN_INDEX 4
static struct map type_map[] = {
{ "Instruction", INSTR },
{ "Data", DATA },
{ "Unified", UNIFIED },
{ },
};
static void more_cpus(int cpu)
{
int old = cachelen;
if (!cachelen)
cachelen = MIN_CPUS/2;
cachelen *= 2;
caches = xrealloc(caches, cachelen * sizeof(struct cache *));
memset(caches + old, 0, (cachelen - old) * sizeof(struct cache *));
}
static unsigned cpumap_len(char *s)
{
unsigned len = 0, width = 0;
do {
if (isxdigit(*s))
width++;
else {
len += round_up(width * 4, BITS_PER_INT) / 8;
width = 0;
}
} while (*s++);
return len;
}
static void parse_cpumap(char *map, unsigned *buf, unsigned len)
{
char *s;
int c;
c = 0;
s = map + strlen(map);
for (;;) {
s = memrchr(map, ',', s - map);
if (!s)
s = map;
else
s++;
buf[c++] = strtoul(s, NULL, 16);
if (s == map)
break;
s--;
}
assert(len == c * sizeof(unsigned));
}
static void read_cpu_map(struct cache *c, char *cfn)
{
char *map = read_field(cfn, "shared_cpu_map");
c->cpumaplen = cpumap_len(map);
c->cpumap = xalloc(c->cpumaplen);
parse_cpumap(map, c->cpumap, c->cpumaplen);
free(map);
}
static int read_caches(void)
{
DIR *cpus = opendir(PREFIX);
struct dirent *de;
if (!cpus) {
Wprintf("Cannot read cache topology from %s", PREFIX);
return -1;
}
while ((de = readdir(cpus)) != NULL) {
unsigned cpu;
if (sscanf(de->d_name, "cpu%u", &cpu) == 1) {
struct stat st;
char *fn;
int i;
int numindex;
asprintf(&fn, "%s/%s/cache", PREFIX, de->d_name);
if (!stat(fn, &st)) {
numindex = st.st_nlink - 2;
if (numindex < 0)
numindex = MIN_INDEX;
if (cachelen <= cpu)
more_cpus(cpu);
caches[cpu] = xalloc(sizeof(struct cache) *
(numindex+1));
for (i = 0; i < numindex; i++) {
char *cfn;
struct cache *c = caches[cpu] + i;
asprintf(&cfn, "%s/index%d", fn, i);
c->type = read_field_map(cfn, "type", type_map);
c->level = read_field_num(cfn, "level");
read_cpu_map(c, cfn);
free(cfn);
}
}
free(fn);
}
}
closedir(cpus);
return 0;
}
int cache_to_cpus(int cpu, unsigned level, unsigned type,
int *cpulen, unsigned **cpumap)
{
struct cache *c;
if (!caches) {
if (read_caches() < 0)
return -1;
if (!caches) {
Wprintf("No caches found in sysfs");
return -1;
}
}
for (c = caches[cpu]; c && c->cpumap; c++) {
//printf("%d level %d type %d\n", cpu, c->level, c->type);
if (c->level == level && c->type == type) {
*cpumap = c->cpumap;
*cpulen = c->cpumaplen;
return 0;
}
}
Wprintf("Cannot find sysfs cache for CPU %d", cpu);
return -1;
}
#ifdef TEST
main()
{
int cpulen;
unsigned *cpumap;
cache_to_cpus(1, 1, INSTR, &cpulen, &cpumap); printf("%d %x\n", cpulen, cpumap[0]);
cache_to_cpus(1, 1, DATA, &cpulen, &cpumap); printf("%d %x\n", cpulen, cpumap[0]);
cache_to_cpus(1, 2, UNIFIED, &cpulen, &cpumap); printf("%d %x\n", cpulen, cpumap[0]);
cache_to_cpus(0, 1, INSTR, &cpulen, &cpumap); printf("%d %x\n", cpulen, cpumap[0]);
cache_to_cpus(0, 1, DATA, &cpulen, &cpumap); printf("%d %x\n", cpulen, cpumap[0]);
cache_to_cpus(0, 2, UNIFIED, &cpulen, &cpumap); printf("%d %x\n", cpulen, cpumap[0]);
}
#endif
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