Orange Pi5 kernel

/*
 * perf.c
 *
 * Performance analysis utility.
 *
 * This is the main hub from which the sub-commands (perf stat,
 * perf top, perf record, perf report, etc.) are started.
 */
#include "builtin.h"
#include "perf.h"
 
#include "util/build-id.h"
#include "util/cache.h"
#include "util/env.h"
#include <internal/lib.h> // page_size
#include <subcmd/exec-cmd.h>
#include "util/config.h"
#include <subcmd/run-command.h>
#include "util/parse-events.h"
#include <subcmd/parse-options.h>
#include "util/bpf-loader.h"
#include "util/debug.h"
#include "util/event.h"
#include "util/util.h" // usage()
#include "ui/ui.h"
#include "perf-sys.h"
#include <api/fs/fs.h>
#include <api/fs/tracing_path.h>
#include <perf/core.h>
#include <errno.h>
#include <pthread.h>
#include <signal.h>
#include <stdlib.h>
#include <time.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/zalloc.h>
 
const char perf_usage_string[] =
<------>"perf [--version] [--help] [OPTIONS] COMMAND [ARGS]";
 
const char perf_more_info_string[] =
<------>"See 'perf help COMMAND' for more information on a specific command.";
 
static int use_pager = -1;
const char *input_name;
 
struct cmd_struct {
<------>const char *cmd;
<------>int (*fn)(int, const char **);
<------>int option;
};
 
static struct cmd_struct commands[] = {
<------>{ "buildid-cache", cmd_buildid_cache, 0 },
<------>{ "buildid-list", cmd_buildid_list, 0 },
<------>{ "config",	cmd_config,	0 },
<------>{ "c2c",	cmd_c2c,	0 },
<------>{ "diff",	cmd_diff,	0 },
<------>{ "evlist",	cmd_evlist,	0 },
<------>{ "help",	cmd_help,	0 },
<------>{ "kallsyms",	cmd_kallsyms,	0 },
<------>{ "list",	cmd_list,	0 },
<------>{ "record",	cmd_record,	0 },
<------>{ "report",	cmd_report,	0 },
<------>{ "bench",	cmd_bench,	0 },
<------>{ "stat",	cmd_stat,	0 },
<------>{ "timechart",	cmd_timechart,	0 },
<------>{ "top",	cmd_top,	0 },
<------>{ "annotate",	cmd_annotate,	0 },
<------>{ "version",	cmd_version,	0 },
<------>{ "script",	cmd_script,	0 },
<------>{ "sched",	cmd_sched,	0 },
#ifdef HAVE_LIBELF_SUPPORT
<------>{ "probe",	cmd_probe,	0 },
#endif
<------>{ "kmem",	cmd_kmem,	0 },
<------>{ "lock",	cmd_lock,	0 },
<------>{ "kvm",	cmd_kvm,	0 },
<------>{ "test",	cmd_test,	0 },
#if defined(HAVE_LIBAUDIT_SUPPORT) || defined(HAVE_SYSCALL_TABLE_SUPPORT)
<------>{ "trace",	cmd_trace,	0 },
#endif
<------>{ "inject",	cmd_inject,	0 },
<------>{ "mem",	cmd_mem,	0 },
<------>{ "data",	cmd_data,	0 },
<------>{ "ftrace",	cmd_ftrace,	0 },
};
 
struct pager_config {
<------>const char *cmd;
<------>int val;
};
 
static int pager_command_config(const char *var, const char *value, void *data)
{
<------>struct pager_config *c = data;
<------>if (strstarts(var, "pager.") && !strcmp(var + 6, c->cmd))
<------><------>c->val = perf_config_bool(var, value);
<------>return 0;
}
 
/* returns 0 for "no pager", 1 for "use pager", and -1 for "not specified" */
static int check_pager_config(const char *cmd)
{
<------>int err;
<------>struct pager_config c;
<------>c.cmd = cmd;
<------>c.val = -1;
<------>err = perf_config(pager_command_config, &c);
<------>return err ?: c.val;
}
 
static int browser_command_config(const char *var, const char *value, void *data)
{
<------>struct pager_config *c = data;
<------>if (strstarts(var, "tui.") && !strcmp(var + 4, c->cmd))
<------><------>c->val = perf_config_bool(var, value);
<------>if (strstarts(var, "gtk.") && !strcmp(var + 4, c->cmd))
<------><------>c->val = perf_config_bool(var, value) ? 2 : 0;
<------>return 0;
}
 
/*
 * returns 0 for "no tui", 1 for "use tui", 2 for "use gtk",
 * and -1 for "not specified"
 */
static int check_browser_config(const char *cmd)
{
<------>int err;
<------>struct pager_config c;
<------>c.cmd = cmd;
<------>c.val = -1;
<------>err = perf_config(browser_command_config, &c);
<------>return err ?: c.val;
}
 
static void commit_pager_choice(void)
{
<------>switch (use_pager) {
<------>case 0:
<------><------>setenv(PERF_PAGER_ENVIRONMENT, "cat", 1);
<------><------>break;
<------>case 1:
<------><------>/* setup_pager(); */
<------><------>break;
<------>default:
<------><------>break;
<------>}
}
 
struct option options[] = {
<------>OPT_ARGUMENT("help", "help"),
<------>OPT_ARGUMENT("version", "version"),
<------>OPT_ARGUMENT("exec-path", "exec-path"),
<------>OPT_ARGUMENT("html-path", "html-path"),
<------>OPT_ARGUMENT("paginate", "paginate"),
<------>OPT_ARGUMENT("no-pager", "no-pager"),
<------>OPT_ARGUMENT("debugfs-dir", "debugfs-dir"),
<------>OPT_ARGUMENT("buildid-dir", "buildid-dir"),
<------>OPT_ARGUMENT("list-cmds", "list-cmds"),
<------>OPT_ARGUMENT("list-opts", "list-opts"),
<------>OPT_ARGUMENT("debug", "debug"),
<------>OPT_END()
};
 
static int handle_options(const char ***argv, int *argc, int *envchanged)
{
<------>int handled = 0;
 
<------>while (*argc > 0) {
<------><------>const char *cmd = (*argv)[0];
<------><------>if (cmd[0] != '-')
<------><------><------>break;
 
<------><------>/*
<------><------> * For legacy reasons, the "version" and "help"
<------><------> * commands can be written with "--" prepended
<------><------> * to make them look like flags.
<------><------> */
<------><------>if (!strcmp(cmd, "--help") || !strcmp(cmd, "--version"))
<------><------><------>break;
 
<------><------>/*
<------><------> * Shortcut for '-h' and '-v' options to invoke help
<------><------> * and version command.
<------><------> */
<------><------>if (!strcmp(cmd, "-h")) {
<------><------><------>(*argv)[0] = "--help";
<------><------><------>break;
<------><------>}
 
<------><------>if (!strcmp(cmd, "-v")) {
<------><------><------>(*argv)[0] = "--version";
<------><------><------>break;
<------><------>}
 
<------><------>if (!strcmp(cmd, "-vv")) {
<------><------><------>(*argv)[0] = "version";
<------><------><------>version_verbose = 1;
<------><------><------>break;
<------><------>}
 
<------><------>/*
<------><------> * Check remaining flags.
<------><------> */
<------><------>if (strstarts(cmd, CMD_EXEC_PATH)) {
<------><------><------>cmd += strlen(CMD_EXEC_PATH);
<------><------><------>if (*cmd == '=')
<------><------><------><------>set_argv_exec_path(cmd + 1);
<------><------><------>else {
<------><------><------><------>puts(get_argv_exec_path());
<------><------><------><------>exit(0);
<------><------><------>}
<------><------>} else if (!strcmp(cmd, "--html-path")) {
<------><------><------>puts(system_path(PERF_HTML_PATH));
<------><------><------>exit(0);
<------><------>} else if (!strcmp(cmd, "-p") || !strcmp(cmd, "--paginate")) {
<------><------><------>use_pager = 1;
<------><------>} else if (!strcmp(cmd, "--no-pager")) {
<------><------><------>use_pager = 0;
<------><------><------>if (envchanged)
<------><------><------><------>*envchanged = 1;
<------><------>} else if (!strcmp(cmd, "--debugfs-dir")) {
<------><------><------>if (*argc < 2) {
<------><------><------><------>fprintf(stderr, "No directory given for --debugfs-dir.\n");
<------><------><------><------>usage(perf_usage_string);
<------><------><------>}
<------><------><------>tracing_path_set((*argv)[1]);
<------><------><------>if (envchanged)
<------><------><------><------>*envchanged = 1;
<------><------><------>(*argv)++;
<------><------><------>(*argc)--;
<------><------>} else if (!strcmp(cmd, "--buildid-dir")) {
<------><------><------>if (*argc < 2) {
<------><------><------><------>fprintf(stderr, "No directory given for --buildid-dir.\n");
<------><------><------><------>usage(perf_usage_string);
<------><------><------>}
<------><------><------>set_buildid_dir((*argv)[1]);
<------><------><------>if (envchanged)
<------><------><------><------>*envchanged = 1;
<------><------><------>(*argv)++;
<------><------><------>(*argc)--;
<------><------>} else if (strstarts(cmd, CMD_DEBUGFS_DIR)) {
<------><------><------>tracing_path_set(cmd + strlen(CMD_DEBUGFS_DIR));
<------><------><------>fprintf(stderr, "dir: %s\n", tracing_path_mount());
<------><------><------>if (envchanged)
<------><------><------><------>*envchanged = 1;
<------><------>} else if (!strcmp(cmd, "--list-cmds")) {
<------><------><------>unsigned int i;
 
<------><------><------>for (i = 0; i < ARRAY_SIZE(commands); i++) {
<------><------><------><------>struct cmd_struct *p = commands+i;
<------><------><------><------>printf("%s ", p->cmd);
<------><------><------>}
<------><------><------>putchar('\n');
<------><------><------>exit(0);
<------><------>} else if (!strcmp(cmd, "--list-opts")) {
<------><------><------>unsigned int i;
 
<------><------><------>for (i = 0; i < ARRAY_SIZE(options)-1; i++) {
<------><------><------><------>struct option *p = options+i;
<------><------><------><------>printf("--%s ", p->long_name);
<------><------><------>}
<------><------><------>putchar('\n');
<------><------><------>exit(0);
<------><------>} else if (!strcmp(cmd, "--debug")) {
<------><------><------>if (*argc < 2) {
<------><------><------><------>fprintf(stderr, "No variable specified for --debug.\n");
<------><------><------><------>usage(perf_usage_string);
<------><------><------>}
<------><------><------>if (perf_debug_option((*argv)[1]))
<------><------><------><------>usage(perf_usage_string);
 
<------><------><------>(*argv)++;
<------><------><------>(*argc)--;
<------><------>} else {
<------><------><------>fprintf(stderr, "Unknown option: %s\n", cmd);
<------><------><------>usage(perf_usage_string);
<------><------>}
 
<------><------>(*argv)++;
<------><------>(*argc)--;
<------><------>handled++;
<------>}
<------>return handled;
}
 
#define RUN_SETUP	(1<<0)
#define USE_PAGER	(1<<1)
 
static int run_builtin(struct cmd_struct *p, int argc, const char **argv)
{
<------>int status;
<------>struct stat st;
<------>char sbuf[STRERR_BUFSIZE];
 
<------>if (use_browser == -1)
<------><------>use_browser = check_browser_config(p->cmd);
 
<------>if (use_pager == -1 && p->option & RUN_SETUP)
<------><------>use_pager = check_pager_config(p->cmd);
<------>if (use_pager == -1 && p->option & USE_PAGER)
<------><------>use_pager = 1;
<------>commit_pager_choice();
 
<------>perf_env__init(&perf_env);
<------>perf_env__set_cmdline(&perf_env, argc, argv);
<------>status = p->fn(argc, argv);
<------>perf_config__exit();
<------>exit_browser(status);
<------>perf_env__exit(&perf_env);
<------>bpf__clear();
 
<------>if (status)
<------><------>return status & 0xff;
 
<------>/* Somebody closed stdout? */
<------>if (fstat(fileno(stdout), &st))
<------><------>return 0;
<------>/* Ignore write errors for pipes and sockets.. */
<------>if (S_ISFIFO(st.st_mode) || S_ISSOCK(st.st_mode))
<------><------>return 0;
 
<------>status = 1;
<------>/* Check for ENOSPC and EIO errors.. */
<------>if (fflush(stdout)) {
<------><------>fprintf(stderr, "write failure on standard output: %s",
<------><------><------>str_error_r(errno, sbuf, sizeof(sbuf)));
<------><------>goto out;
<------>}
<------>if (ferror(stdout)) {
<------><------>fprintf(stderr, "unknown write failure on standard output");
<------><------>goto out;
<------>}
<------>if (fclose(stdout)) {
<------><------>fprintf(stderr, "close failed on standard output: %s",
<------><------><------>str_error_r(errno, sbuf, sizeof(sbuf)));
<------><------>goto out;
<------>}
<------>status = 0;
out:
<------>return status;
}
 
static void handle_internal_command(int argc, const char **argv)
{
<------>const char *cmd = argv[0];
<------>unsigned int i;
 
<------>/* Turn "perf cmd --help" into "perf help cmd" */
<------>if (argc > 1 && !strcmp(argv[1], "--help")) {
<------><------>argv[1] = argv[0];
<------><------>argv[0] = cmd = "help";
<------>}
 
<------>for (i = 0; i < ARRAY_SIZE(commands); i++) {
<------><------>struct cmd_struct *p = commands+i;
<------><------>if (strcmp(p->cmd, cmd))
<------><------><------>continue;
<------><------>exit(run_builtin(p, argc, argv));
<------>}
}
 
static void execv_dashed_external(const char **argv)
{
<------>char *cmd;
<------>const char *tmp;
<------>int status;
 
<------>if (asprintf(&cmd, "perf-%s", argv[0]) < 0)
<------><------>goto do_die;
 
<------>/*
<------> * argv[0] must be the perf command, but the argv array
<------> * belongs to the caller, and may be reused in
<------> * subsequent loop iterations. Save argv[0] and
<------> * restore it on error.
<------> */
<------>tmp = argv[0];
<------>argv[0] = cmd;
 
<------>/*
<------> * if we fail because the command is not found, it is
<------> * OK to return. Otherwise, we just pass along the status code.
<------> */
<------>status = run_command_v_opt(argv, 0);
<------>if (status != -ERR_RUN_COMMAND_EXEC) {
<------><------>if (IS_RUN_COMMAND_ERR(status)) {
do_die:
<------><------><------>pr_err("FATAL: unable to run '%s'", argv[0]);
<------><------><------>status = -128;
<------><------>}
<------><------>exit(-status);
<------>}
<------>errno = ENOENT; /* as if we called execvp */
 
<------>argv[0] = tmp;
<------>zfree(&cmd);
}
 
static int run_argv(int *argcp, const char ***argv)
{
<------>/* See if it's an internal command */
<------>handle_internal_command(*argcp, *argv);
 
<------>/* .. then try the external ones */
<------>execv_dashed_external(*argv);
<------>return 0;
}
 
static void pthread__block_sigwinch(void)
{
<------>sigset_t set;
 
<------>sigemptyset(&set);
<------>sigaddset(&set, SIGWINCH);
<------>pthread_sigmask(SIG_BLOCK, &set, NULL);
}
 
void pthread__unblock_sigwinch(void)
{
<------>sigset_t set;
 
<------>sigemptyset(&set);
<------>sigaddset(&set, SIGWINCH);
<------>pthread_sigmask(SIG_UNBLOCK, &set, NULL);
}
 
static int libperf_print(enum libperf_print_level level,
<------><------><------> const char *fmt, va_list ap)
{
<------>return eprintf(level, verbose, fmt, ap);
}
 
int main(int argc, const char **argv)
{
<------>int err;
<------>const char *cmd;
<------>char sbuf[STRERR_BUFSIZE];
 
<------>/* libsubcmd init */
<------>exec_cmd_init("perf", PREFIX, PERF_EXEC_PATH, EXEC_PATH_ENVIRONMENT);
<------>pager_init(PERF_PAGER_ENVIRONMENT);
 
<------>libperf_init(libperf_print);
 
<------>cmd = extract_argv0_path(argv[0]);
<------>if (!cmd)
<------><------>cmd = "perf-help";
 
<------>srandom(time(NULL));
 
<------>/* Setting $PERF_CONFIG makes perf read _only_ the given config file. */
<------>config_exclusive_filename = getenv("PERF_CONFIG");
 
<------>err = perf_config(perf_default_config, NULL);
<------>if (err)
<------><------>return err;
<------>set_buildid_dir(NULL);
 
<------>/*
<------> * "perf-xxxx" is the same as "perf xxxx", but we obviously:
<------> *
<------> *  - cannot take flags in between the "perf" and the "xxxx".
<------> *  - cannot execute it externally (since it would just do
<------> *    the same thing over again)
<------> *
<------> * So we just directly call the internal command handler. If that one
<------> * fails to handle this, then maybe we just run a renamed perf binary
<------> * that contains a dash in its name. To handle this scenario, we just
<------> * fall through and ignore the "xxxx" part of the command string.
<------> */
<------>if (strstarts(cmd, "perf-")) {
<------><------>cmd += 5;
<------><------>argv[0] = cmd;
<------><------>handle_internal_command(argc, argv);
<------><------>/*
<------><------> * If the command is handled, the above function does not
<------><------> * return undo changes and fall through in such a case.
<------><------> */
<------><------>cmd -= 5;
<------><------>argv[0] = cmd;
<------>}
<------>if (strstarts(cmd, "trace")) {
#if defined(HAVE_LIBAUDIT_SUPPORT) || defined(HAVE_SYSCALL_TABLE_SUPPORT)
<------><------>setup_path();
<------><------>argv[0] = "trace";
<------><------>return cmd_trace(argc, argv);
#else
<------><------>fprintf(stderr,
<------><------><------>"trace command not available: missing audit-libs devel package at build time.\n");
<------><------>goto out;
#endif
<------>}
<------>/* Look for flags.. */
<------>argv++;
<------>argc--;
<------>handle_options(&argv, &argc, NULL);
<------>commit_pager_choice();
 
<------>if (argc > 0) {
<------><------>if (strstarts(argv[0], "--"))
<------><------><------>argv[0] += 2;
<------>} else {
<------><------>/* The user didn't specify a command; give them help */
<------><------>printf("\n usage: %s\n\n", perf_usage_string);
<------><------>list_common_cmds_help();
<------><------>printf("\n %s\n\n", perf_more_info_string);
<------><------>goto out;
<------>}
<------>cmd = argv[0];
 
<------>test_attr__init();
 
<------>/*
<------> * We use PATH to find perf commands, but we prepend some higher
<------> * precedence paths: the "--exec-path" option, the PERF_EXEC_PATH
<------> * environment, and the $(perfexecdir) from the Makefile at build
<------> * time.
<------> */
<------>setup_path();
<------>/*
<------> * Block SIGWINCH notifications so that the thread that wants it can
<------> * unblock and get syscalls like select interrupted instead of waiting
<------> * forever while the signal goes to some other non interested thread.
<------> */
<------>pthread__block_sigwinch();
 
<------>perf_debug_setup();
 
<------>while (1) {
<------><------>static int done_help;
 
<------><------>run_argv(&argc, &argv);
 
<------><------>if (errno != ENOENT)
<------><------><------>break;
 
<------><------>if (!done_help) {
<------><------><------>cmd = argv[0] = help_unknown_cmd(cmd);
<------><------><------>done_help = 1;
<------><------>} else
<------><------><------>break;
<------>}
 
<------>fprintf(stderr, "Failed to run command '%s': %s\n",
<------><------>cmd, str_error_r(errno, sbuf, sizeof(sbuf)));
out:
<------>return 1;
}