tools/perf/util/env.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0
 #include "cpumap.h"
 #include "debug.h"
 #include "env.h"
 #include "util/header.h"
 #include <linux/ctype.h>
 #include <linux/zalloc.h>
 #include "bpf-event.h"
 #include "cgroup.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);
 	perf_env__purge_cgroups(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);
 	zfree(&env->numa_map);

 	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;
 }

 int perf_env__read_cpuid(struct perf_env *env)
 {
 	char cpuid[128];
 	int err = get_cpuid(cpuid, sizeof(cpuid));

 	if (err)
 		return err;

 	free(env->cpuid);
 	env->cpuid = strdup(cpuid);
 	if (env->cpuid == NULL)
 		return ENOMEM;
 	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)
 {
 	char *arch_name;

 	if (!env || !env->arch) { /* Assume local operation */
 		static struct utsname uts = { .machine[0] = '\0', };
 		if (uts.machine[0] == '\0' && uname(&uts) < 0)
 			return NULL;
 		arch_name = uts.machine;
 	} else
 		arch_name = env->arch;

 	return normalize_arch(arch_name);
 }


 int perf_env__numa_node(struct perf_env *env, int cpu)
 {
 	if (!env->nr_numa_map) {
 		struct numa_node *nn;
 		int i, nr = 0;

 		for (i = 0; i < env->nr_numa_nodes; i++) {
 			nn = &env->numa_nodes[i];
 			nr = max(nr, perf_cpu_map__max(nn->map));
 		}

 		nr++;

 		/*
 		 * We initialize the numa_map array to prepare
 		 * it for missing cpus, which return node -1
 		 */
 		env->numa_map = malloc(nr * sizeof(int));
 		if (!env->numa_map)
 			return -1;

 		for (i = 0; i < nr; i++)
 			env->numa_map[i] = -1;

 		env->nr_numa_map = nr;

 		for (i = 0; i < env->nr_numa_nodes; i++) {
 			int tmp, j;

 			nn = &env->numa_nodes[i];
 			perf_cpu_map__for_each_cpu(j, tmp, nn->map)
 				env->numa_map[j] = i;
 		}
 	}

 	return cpu >= 0 && cpu < env->nr_numa_map ? env->numa_map[cpu] : -1;
 }
	// SPDX-License-Identifier: GPL-2.0
	#include "cpumap.h"
	#include "debug.h"
	#include "env.h"
	#include "util/header.h"
	#include <linux/ctype.h>
	#include <linux/zalloc.h>
	#include "bpf-event.h"
	#include "cgroup.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);
	perf_env__purge_cgroups(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);
	zfree(&env->numa_map);

	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;
	}

	int perf_env__read_cpuid(struct perf_env *env)
	{
	char cpuid[128];
	int err = get_cpuid(cpuid, sizeof(cpuid));

	if (err)
	return err;

	free(env->cpuid);
	env->cpuid = strdup(cpuid);
	if (env->cpuid == NULL)
	return ENOMEM;
	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)
	{
	char *arch_name;

	if (!env \|\| !env->arch) { /* Assume local operation */
	static struct utsname uts = { .machine[0] = '\0', };
	if (uts.machine[0] == '\0' && uname(&uts) < 0)
	return NULL;
	arch_name = uts.machine;
	} else
	arch_name = env->arch;

	return normalize_arch(arch_name);
	}


	int perf_env__numa_node(struct perf_env *env, int cpu)
	{
	if (!env->nr_numa_map) {
	struct numa_node *nn;
	int i, nr = 0;

	for (i = 0; i < env->nr_numa_nodes; i++) {
	nn = &env->numa_nodes[i];
	nr = max(nr, perf_cpu_map__max(nn->map));
	}

	nr++;

	/*
	* We initialize the numa_map array to prepare
	* it for missing cpus, which return node -1
	*/
	env->numa_map = malloc(nr * sizeof(int));
	if (!env->numa_map)
	return -1;

	for (i = 0; i < nr; i++)
	env->numa_map[i] = -1;

	env->nr_numa_map = nr;

	for (i = 0; i < env->nr_numa_nodes; i++) {
	int tmp, j;

	nn = &env->numa_nodes[i];
	perf_cpu_map__for_each_cpu(j, tmp, nn->map)
	env->numa_map[j] = i;
	}
	}

	return cpu >= 0 && cpu < env->nr_numa_map ? env->numa_map[cpu] : -1;
	}