// SPDX-License-Identifier: GPL-2.0
#include "cpumap.h"
#include "debug.h"
#include "env.h"
#include <linux/ctype.h>
#include <linux/zalloc.h>
#include "bpf-event.h"
#include <errno.h>
#include <sys/utsname.h>
#include <bpf/libbpf.h>
#include <stdlib.h>
#include <string.h>

struct perf_env perf_env;

void perf_env__insert_bpf_prog_info(struct perf_env *env,
                                    struct bpf_prog_info_node *info_node)
{
        __u32 prog_id = info_node->info_linear->info.id;
        struct bpf_prog_info_node *node;
        struct rb_node *parent = NULL;
        struct rb_node **p;

        down_write(&env->bpf_progs.lock);
        p = &env->bpf_progs.infos.rb_node;

        while (*p != NULL) {
                parent = *p;
                node = rb_entry(parent, struct bpf_prog_info_node, rb_node);
                if (prog_id < node->info_linear->info.id) {
                        p = &(*p)->rb_left;
                } else if (prog_id > node->info_linear->info.id) {
                        p = &(*p)->rb_right;
                } else {
                        pr_debug("duplicated bpf prog info %u\n", prog_id);
                        goto out;
                }
        }

        rb_link_node(&info_node->rb_node, parent, p);
        rb_insert_color(&info_node->rb_node, &env->bpf_progs.infos);
        env->bpf_progs.infos_cnt++;
out:
        up_write(&env->bpf_progs.lock);
}

struct bpf_prog_info_node *perf_env__find_bpf_prog_info(struct perf_env *env,
                                                        __u32 prog_id)
{
        struct bpf_prog_info_node *node = NULL;
        struct rb_node *n;

        down_read(&env->bpf_progs.lock);
        n = env->bpf_progs.infos.rb_node;

        while (n) {
                node = rb_entry(n, struct bpf_prog_info_node, rb_node);
                if (prog_id < node->info_linear->info.id)
                        n = n->rb_left;
                else if (prog_id > node->info_linear->info.id)
                        n = n->rb_right;
                else
                        goto out;
        }
        node = NULL;

out:
        up_read(&env->bpf_progs.lock);
        return node;
}

void perf_env__insert_btf(struct perf_env *env, struct btf_node *btf_node)
{
        struct rb_node *parent = NULL;
        __u32 btf_id = btf_node->id;
        struct btf_node *node;
        struct rb_node **p;

        down_write(&env->bpf_progs.lock);
        p = &env->bpf_progs.btfs.rb_node;

        while (*p != NULL) {
                parent = *p;
                node = rb_entry(parent, struct btf_node, rb_node);
                if (btf_id < node->id) {
                        p = &(*p)->rb_left;
                } else if (btf_id > node->id) {
                        p = &(*p)->rb_right;
                } else {
                        pr_debug("duplicated btf %u\n", btf_id);
                        goto out;
                }
        }

        rb_link_node(&btf_node->rb_node, parent, p);
        rb_insert_color(&btf_node->rb_node, &env->bpf_progs.btfs);
        env->bpf_progs.btfs_cnt++;
out:
        up_write(&env->bpf_progs.lock);
}

struct btf_node *perf_env__find_btf(struct perf_env *env, __u32 btf_id)
{
        struct btf_node *node = NULL;
        struct rb_node *n;

        down_read(&env->bpf_progs.lock);
        n = env->bpf_progs.btfs.rb_node;

        while (n) {
                node = rb_entry(n, struct btf_node, rb_node);
                if (btf_id < node->id)
                        n = n->rb_left;
                else if (btf_id > node->id)
                        n = n->rb_right;
                else
                        goto out;
        }
        node = NULL;

out:
        up_read(&env->bpf_progs.lock);
        return node;
}

/* purge data in bpf_progs.infos tree */
static void perf_env__purge_bpf(struct perf_env *env)
{
        struct rb_root *root;
        struct rb_node *next;

        down_write(&env->bpf_progs.lock);

        root = &env->bpf_progs.infos;
        next = rb_first(root);

        while (next) {
                struct bpf_prog_info_node *node;

                node = rb_entry(next, struct bpf_prog_info_node, rb_node);
                next = rb_next(&node->rb_node);
                rb_erase(&node->rb_node, root);
                free(node);
        }

        env->bpf_progs.infos_cnt = 0;

        root = &env->bpf_progs.btfs;
        next = rb_first(root);

        while (next) {
                struct btf_node *node;

                node = rb_entry(next, struct btf_node, rb_node);
                next = rb_next(&node->rb_node);
                rb_erase(&node->rb_node, root);
                free(node);
        }

        env->bpf_progs.btfs_cnt = 0;

        up_write(&env->bpf_progs.lock);
}

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

        perf_env__purge_bpf(env);
        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++)
                perf_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++)
                zfree(&env->memory_nodes[i].set);
        zfree(&env->memory_nodes);
}

void perf_env__init(struct perf_env *env)
{
        env->bpf_progs.infos = RB_ROOT;
        env->bpf_progs.btfs = RB_ROOT;
        init_rwsem(&env->bpf_progs.lock);
}

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->cpu[cpu].die_id    = cpu_map__get_die_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)
{
        zfree(&cache->type);
        zfree(&cache->map);
        zfree(&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 || !env->arch) { /* Assume local operation */
                if (uname(&uts) < 0)
                        return NULL;
                arch_name = uts.machine;
        } else
                arch_name = env->arch;

        return normalize_arch(arch_name);
}