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/*
* BSD LICENSE
*
* Copyright(c) 2016-2017 Netronome.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Netronome nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "cpuinfo.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include <glob.h>
#define STRMATCH(test,strptr) (strncmp(test, strptr, strlen(test))==0)
static cpuinfo_t cpuinfo;
static int parsed=0;
static int parse_cpuinfo(void)
{
FILE *cpuinfofile=fopen("/proc/cpuinfo","r");
char *lineptr=NULL;
size_t n=0;
int curprocessor=-1;
memset(&cpuinfo, 0, sizeof(cpuinfo));
while (getline(&lineptr, &n, cpuinfofile)>0) {
if (STRMATCH("processor", lineptr)) {
int val = atoi(strchr(lineptr + 8, ':') + 1);
if (val >= MAX_CPUS)
break;
cpuinfo.cpubitmap |= (1ULL<<val);
cpuinfo.cpus[val].cpunum = val;
cpuinfo.cpus[val].alive = 1;
curprocessor = val;
++cpuinfo.numcpus;
} else if (STRMATCH("physical id", lineptr)) {
int val=atoi(strchr(lineptr + 8, ':') + 1);
cpuinfo.cpus[curprocessor].socket = val;
if ((unsigned)(val + 1) > cpuinfo.numsockets)
cpuinfo.numsockets = val + 1;
} else if (STRMATCH("core id", lineptr)) {
int val = atoi(strchr(lineptr + 8, ':') + 1);
cpuinfo.cpus[curprocessor].corenum = val;
}
free(lineptr);
lineptr = NULL;
n = 0;
}
if (lineptr)
free(lineptr);
fclose(cpuinfofile);
return 0;
}
/* See
* https://www.kernel.org/doc/Documentation/ABI/testing/sysfs-devices-system-cpu
*/
static int parse_sysfs(void)
{
glob_t globbuf;
unsigned i;
unsigned numabit=0;
unsigned numnodes=0;
int ofs=sizeof("/sys/devices/system/node/node")-1;
glob("/sys/devices/system/node/node[0-9]*/cpu[0-9]*", 0, NULL, &globbuf);
for (i = 0; i < globbuf.gl_pathc; ++i) {
const char *s = globbuf.gl_pathv[i]+ofs;
int node = atoi(s);
int cpu;
if (((1<<node) & numabit) == 0) {
numabit |= (1<<node);
++numnodes;
}
cpu = atoi(strchr(s, '/') + 4);
if (cpu < MAX_CPUS)
cpuinfo.cpus[cpu].numanode = node;
}
globfree(&globbuf);
cpuinfo.numnodes = numnodes;
return 0;
}
cpuinfo_t *get_cpuinfo(void)
{
if (!parsed) {
if (parse_cpuinfo() != 0)
return 0;
if (parse_sysfs() != 0)
return 0;
parsed = 1;
}
return &cpuinfo;
}
/* gcc -D_CPUINFO_UNITTEST_ cpuinfo.c -o c */
#ifdef _CPUINFO_UNITTEST_
#include <assert.h>
int main()
{
int i;
cpuinfo_t *c = get_cpuinfo();
assert(c != 0);
printf("Num CPUs: %u (0x%016llX), num sockets=%u, num nodes=%u\n",
c->numcpus, (long long)c->cpubitmap, c->numsockets, c->numnodes);
for (i = 0; i < c->numcpus; ++i)
printf("CPU%d: core=%u, socket=%u, numanode=%u\n",
i, c->cpus[i].corenum, c->cpus[i].socket,
c->cpus[i].numanode);
return 0;
}
#endif
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