v4.19.13 snapshot.
diff --git a/tools/perf/perf.c b/tools/perf/perf.c
new file mode 100644
index 0000000..a11cb00
--- /dev/null
+++ b/tools/perf/perf.c
@@ -0,0 +1,536 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * 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 "util/env.h"
+#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 <api/fs/fs.h>
+#include <api/fs/tracing_path.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>
+
+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__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);
+}
+
+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);
+
+ /* The page_size is placed in util object. */
+ page_size = sysconf(_SC_PAGE_SIZE);
+
+ cmd = extract_argv0_path(argv[0]);
+ if (!cmd)
+ cmd = "perf-help";
+
+ srandom(time(NULL));
+
+ 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;
+}