env.c

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// SPDX-License-Identifier: GPL-2.0
#include "cpumap.h"
#include "env.h"
#include "sane_ctype.h"
#include "util.h"
#include <errno.h>
#include <sys/utsname.h>

struct perf_env perf_env;

void perf_env__exit(struct perf_env *env)
{
    int i;

    zfree(&env->hostname);
    zfree(&env->os_release);
    zfree(&env->version);
    zfree(&env->arch);
    zfree(&env->cpu_desc);
    zfree(&env->cpuid);
    zfree(&env->cmdline);
    zfree(&env->cmdline_argv);
    zfree(&env->sibling_cores);
    zfree(&env->sibling_threads);
    zfree(&env->pmu_mappings);
    zfree(&env->cpu);

    for (i = 0; i < env->nr_numa_nodes; i++)
        cpu_map__put(env->numa_nodes[i].map);
    zfree(&env->numa_nodes);

    for (i = 0; i < env->caches_cnt; i++)
        cpu_cache_level__free(&env->caches[i]);
    zfree(&env->caches);

    for (i = 0; i < env->nr_memory_nodes; i++)
        free(env->memory_nodes[i].set);
    zfree(&env->memory_nodes);
}

int perf_env__set_cmdline(struct perf_env *env, int argc, const char *argv[])
{
    int i;

    /* do not include NULL termination */
    env->cmdline_argv = calloc(argc, sizeof(char *));
    if (env->cmdline_argv == NULL)
        goto out_enomem;

    /*
     * Must copy argv contents because it gets moved around during option
     * parsing:
     */
    for (i = 0; i < argc ; i++) {
        env->cmdline_argv[i] = argv[i];
        if (env->cmdline_argv[i] == NULL)
            goto out_free;
    }

    env->nr_cmdline = argc;

    return 0;
out_free:
    zfree(&env->cmdline_argv);
out_enomem:
    return -ENOMEM;
}

int perf_env__read_cpu_topology_map(struct perf_env *env)
{
    int cpu, nr_cpus;

    if (env->cpu != NULL)
        return 0;

    if (env->nr_cpus_avail == 0)
        env->nr_cpus_avail = cpu__max_present_cpu();

    nr_cpus = env->nr_cpus_avail;
    if (nr_cpus == -1)
        return -EINVAL;

    env->cpu = calloc(nr_cpus, sizeof(env->cpu[0]));
    if (env->cpu == NULL)
        return -ENOMEM;

    for (cpu = 0; cpu < nr_cpus; ++cpu) {
        env->cpu[cpu].core_id   = cpu_map__get_core_id(cpu);
        env->cpu[cpu].socket_id = cpu_map__get_socket_id(cpu);
    }

    env->nr_cpus_avail = nr_cpus;
    return 0;
}

static int perf_env__read_arch(struct perf_env *env)
{
    struct utsname uts;

    if (env->arch)
        return 0;

    if (!uname(&uts))
        env->arch = strdup(uts.machine);

    return env->arch ? 0 : -ENOMEM;
}

static int perf_env__read_nr_cpus_avail(struct perf_env *env)
{
    if (env->nr_cpus_avail == 0)
        env->nr_cpus_avail = cpu__max_present_cpu();

    return env->nr_cpus_avail ? 0 : -ENOENT;
}

const char *perf_env__raw_arch(struct perf_env *env)
{
    return env && !perf_env__read_arch(env) ? env->arch : "unknown";
}

int perf_env__nr_cpus_avail(struct perf_env *env)
{
    return env && !perf_env__read_nr_cpus_avail(env) ? env->nr_cpus_avail : 0;
}

void cpu_cache_level__free(struct cpu_cache_level *cache)
{
    free(cache->type);
    free(cache->map);
    free(cache->size);
}

/*
 * Return architecture name in a normalized form.
 * The conversion logic comes from the Makefile.
 */
static const char *normalize_arch(char *arch)
{
    if (!strcmp(arch, "x86_64"))
        return "x86";
    if (arch[0] == 'i' && arch[2] == '8' && arch[3] == '6')
        return "x86";
    if (!strcmp(arch, "sun4u") || !strncmp(arch, "sparc", 5))
        return "sparc";
    if (!strcmp(arch, "aarch64") || !strcmp(arch, "arm64"))
        return "arm64";
    if (!strncmp(arch, "arm", 3) || !strcmp(arch, "sa110"))
        return "arm";
    if (!strncmp(arch, "s390", 4))
        return "s390";
    if (!strncmp(arch, "parisc", 6))
        return "parisc";
    if (!strncmp(arch, "powerpc", 7) || !strncmp(arch, "ppc", 3))
        return "powerpc";
    if (!strncmp(arch, "mips", 4))
        return "mips";
    if (!strncmp(arch, "sh", 2) && isdigit(arch[2]))
        return "sh";

    return arch;
}

const char *perf_env__arch(struct perf_env *env)
{
    struct utsname uts;
    char *arch_name;

    if (!env) { /* Assume local operation */
        if (uname(&uts) < 0)
            return NULL;
        arch_name = uts.machine;
    } else
        arch_name = env->arch;

    return normalize_arch(arch_name);
}