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// SPDX-License-Identifier: GPL-2.0
#include <sys/param.h>
#include <inttypes.h>
#include <api/fs/fs.h>
#include "cputopo.h"
#include "cpumap.h"
#include "util.h"
#include "env.h"
#define CORE_SIB_FMT \
"%s/devices/system/cpu/cpu%d/topology/core_siblings_list"
#define THRD_SIB_FMT \
"%s/devices/system/cpu/cpu%d/topology/thread_siblings_list"
#define NODE_ONLINE_FMT \
"%s/devices/system/node/online"
#define NODE_MEMINFO_FMT \
"%s/devices/system/node/node%d/meminfo"
#define NODE_CPULIST_FMT \
"%s/devices/system/node/node%d/cpulist"
static int build_cpu_topology(struct cpu_topology *tp, int cpu)
{
FILE *fp;
char filename[MAXPATHLEN];
char *buf = NULL, *p;
size_t len = 0;
ssize_t sret;
u32 i = 0;
int ret = -1;
scnprintf(filename, MAXPATHLEN, CORE_SIB_FMT,
sysfs__mountpoint(), cpu);
fp = fopen(filename, "r");
if (!fp)
goto try_threads;
sret = getline(&buf, &len, fp);
fclose(fp);
if (sret <= 0)
goto try_threads;
p = strchr(buf, '\n');
if (p)
*p = '\0';
for (i = 0; i < tp->core_sib; i++) {
if (!strcmp(buf, tp->core_siblings[i]))
break;
}
if (i == tp->core_sib) {
tp->core_siblings[i] = buf;
tp->core_sib++;
buf = NULL;
len = 0;
}
ret = 0;
try_threads:
scnprintf(filename, MAXPATHLEN, THRD_SIB_FMT,
sysfs__mountpoint(), cpu);
fp = fopen(filename, "r");
if (!fp)
goto done;
if (getline(&buf, &len, fp) <= 0)
goto done;
p = strchr(buf, '\n');
if (p)
*p = '\0';
for (i = 0; i < tp->thread_sib; i++) {
if (!strcmp(buf, tp->thread_siblings[i]))
break;
}
if (i == tp->thread_sib) {
tp->thread_siblings[i] = buf;
tp->thread_sib++;
buf = NULL;
}
ret = 0;
done:
if (fp)
fclose(fp);
free(buf);
return ret;
}
void cpu_topology__delete(struct cpu_topology *tp)
{
u32 i;
if (!tp)
return;
for (i = 0 ; i < tp->core_sib; i++)
zfree(&tp->core_siblings[i]);
for (i = 0 ; i < tp->thread_sib; i++)
zfree(&tp->thread_siblings[i]);
free(tp);
}
struct cpu_topology *cpu_topology__new(void)
{
struct cpu_topology *tp = NULL;
void *addr;
u32 nr, i;
size_t sz;
long ncpus;
int ret = -1;
struct cpu_map *map;
ncpus = cpu__max_present_cpu();
/* build online CPU map */
map = cpu_map__new(NULL);
if (map == NULL) {
pr_debug("failed to get system cpumap\n");
return NULL;
}
nr = (u32)(ncpus & UINT_MAX);
sz = nr * sizeof(char *);
addr = calloc(1, sizeof(*tp) + 2 * sz);
if (!addr)
goto out_free;
tp = addr;
addr += sizeof(*tp);
tp->core_siblings = addr;
addr += sz;
tp->thread_siblings = addr;
for (i = 0; i < nr; i++) {
if (!cpu_map__has(map, i))
continue;
ret = build_cpu_topology(tp, i);
if (ret < 0)
break;
}
out_free:
cpu_map__put(map);
if (ret) {
cpu_topology__delete(tp);
tp = NULL;
}
return tp;
}
static int load_numa_node(struct numa_topology_node *node, int nr)
{
char str[MAXPATHLEN];
char field[32];
char *buf = NULL, *p;
size_t len = 0;
int ret = -1;
FILE *fp;
u64 mem;
node->node = (u32) nr;
scnprintf(str, MAXPATHLEN, NODE_MEMINFO_FMT,
sysfs__mountpoint(), nr);
fp = fopen(str, "r");
if (!fp)
return -1;
while (getline(&buf, &len, fp) > 0) {
/* skip over invalid lines */
if (!strchr(buf, ':'))
continue;
if (sscanf(buf, "%*s %*d %31s %"PRIu64, field, &mem) != 2)
goto err;
if (!strcmp(field, "MemTotal:"))
node->mem_total = mem;
if (!strcmp(field, "MemFree:"))
node->mem_free = mem;
if (node->mem_total && node->mem_free)
break;
}
fclose(fp);
fp = NULL;
scnprintf(str, MAXPATHLEN, NODE_CPULIST_FMT,
sysfs__mountpoint(), nr);
fp = fopen(str, "r");
if (!fp)
return -1;
if (getline(&buf, &len, fp) <= 0)
goto err;
p = strchr(buf, '\n');
if (p)
*p = '\0';
node->cpus = buf;
fclose(fp);
return 0;
err:
free(buf);
if (fp)
fclose(fp);
return ret;
}
struct numa_topology *numa_topology__new(void)
{
struct cpu_map *node_map = NULL;
struct numa_topology *tp = NULL;
char path[MAXPATHLEN];
char *buf = NULL;
size_t len = 0;
u32 nr, i;
FILE *fp;
char *c;
scnprintf(path, MAXPATHLEN, NODE_ONLINE_FMT,
sysfs__mountpoint());
fp = fopen(path, "r");
if (!fp)
return NULL;
if (getline(&buf, &len, fp) <= 0)
goto out;
c = strchr(buf, '\n');
if (c)
*c = '\0';
node_map = cpu_map__new(buf);
if (!node_map)
goto out;
nr = (u32) node_map->nr;
tp = zalloc(sizeof(*tp) + sizeof(tp->nodes[0])*nr);
if (!tp)
goto out;
tp->nr = nr;
for (i = 0; i < nr; i++) {
if (load_numa_node(&tp->nodes[i], node_map->map[i])) {
numa_topology__delete(tp);
tp = NULL;
break;
}
}
out:
free(buf);
fclose(fp);
cpu_map__put(node_map);
return tp;
}
void numa_topology__delete(struct numa_topology *tp)
{
u32 i;
for (i = 0; i < tp->nr; i++)
free(tp->nodes[i].cpus);
free(tp);
}
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