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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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4208735d8d
Not needed in this header, added to the places that need poll(), wait() and a few other prototypes. Link: http://lkml.kernel.org/n/tip-i39c7b6xmo1vwd9wxp6fmkl0@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
369 lines
7.6 KiB
C
369 lines
7.6 KiB
C
/*
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* builtin-ftrace.c
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*
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* Copyright (c) 2013 LG Electronics, Namhyung Kim <namhyung@kernel.org>
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*
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* Released under the GPL v2.
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*/
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#include "builtin.h"
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#include "perf.h"
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#include <errno.h>
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#include <unistd.h>
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#include <signal.h>
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#include <fcntl.h>
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#include <poll.h>
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#include "debug.h"
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#include <subcmd/parse-options.h>
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#include <api/fs/tracing_path.h>
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#include "evlist.h"
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#include "target.h"
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#include "cpumap.h"
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#include "thread_map.h"
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#include "util/config.h"
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#define DEFAULT_TRACER "function_graph"
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struct perf_ftrace {
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struct perf_evlist *evlist;
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struct target target;
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const char *tracer;
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};
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static bool done;
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static void sig_handler(int sig __maybe_unused)
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{
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done = true;
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}
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/*
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* perf_evlist__prepare_workload will send a SIGUSR1 if the fork fails, since
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* we asked by setting its exec_error to the function below,
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* ftrace__workload_exec_failed_signal.
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*
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* XXX We need to handle this more appropriately, emitting an error, etc.
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*/
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static void ftrace__workload_exec_failed_signal(int signo __maybe_unused,
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siginfo_t *info __maybe_unused,
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void *ucontext __maybe_unused)
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{
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/* workload_exec_errno = info->si_value.sival_int; */
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done = true;
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}
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static int __write_tracing_file(const char *name, const char *val, bool append)
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{
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char *file;
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int fd, ret = -1;
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ssize_t size = strlen(val);
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int flags = O_WRONLY;
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file = get_tracing_file(name);
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if (!file) {
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pr_debug("cannot get tracing file: %s\n", name);
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return -1;
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}
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if (append)
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flags |= O_APPEND;
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else
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flags |= O_TRUNC;
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fd = open(file, flags);
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if (fd < 0) {
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pr_debug("cannot open tracing file: %s\n", name);
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goto out;
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}
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if (write(fd, val, size) == size)
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ret = 0;
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else
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pr_debug("write '%s' to tracing/%s failed\n", val, name);
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close(fd);
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out:
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put_tracing_file(file);
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return ret;
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}
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static int write_tracing_file(const char *name, const char *val)
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{
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return __write_tracing_file(name, val, false);
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}
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static int append_tracing_file(const char *name, const char *val)
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{
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return __write_tracing_file(name, val, true);
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}
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static int reset_tracing_cpu(void);
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static int reset_tracing_files(struct perf_ftrace *ftrace __maybe_unused)
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{
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if (write_tracing_file("tracing_on", "0") < 0)
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return -1;
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if (write_tracing_file("current_tracer", "nop") < 0)
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return -1;
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if (write_tracing_file("set_ftrace_pid", " ") < 0)
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return -1;
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if (reset_tracing_cpu() < 0)
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return -1;
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return 0;
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}
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static int set_tracing_pid(struct perf_ftrace *ftrace)
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{
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int i;
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char buf[16];
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if (target__has_cpu(&ftrace->target))
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return 0;
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for (i = 0; i < thread_map__nr(ftrace->evlist->threads); i++) {
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scnprintf(buf, sizeof(buf), "%d",
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ftrace->evlist->threads->map[i]);
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if (append_tracing_file("set_ftrace_pid", buf) < 0)
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return -1;
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}
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return 0;
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}
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static int set_tracing_cpumask(struct cpu_map *cpumap)
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{
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char *cpumask;
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size_t mask_size;
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int ret;
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int last_cpu;
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last_cpu = cpu_map__cpu(cpumap, cpumap->nr - 1);
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mask_size = (last_cpu + 3) / 4 + 1;
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mask_size += last_cpu / 32; /* ',' is needed for every 32th cpus */
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cpumask = malloc(mask_size);
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if (cpumask == NULL) {
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pr_debug("failed to allocate cpu mask\n");
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return -1;
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}
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cpu_map__snprint_mask(cpumap, cpumask, mask_size);
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ret = write_tracing_file("tracing_cpumask", cpumask);
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free(cpumask);
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return ret;
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}
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static int set_tracing_cpu(struct perf_ftrace *ftrace)
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{
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struct cpu_map *cpumap = ftrace->evlist->cpus;
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if (!target__has_cpu(&ftrace->target))
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return 0;
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return set_tracing_cpumask(cpumap);
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}
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static int reset_tracing_cpu(void)
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{
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struct cpu_map *cpumap = cpu_map__new(NULL);
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int ret;
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ret = set_tracing_cpumask(cpumap);
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cpu_map__put(cpumap);
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return ret;
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}
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static int __cmd_ftrace(struct perf_ftrace *ftrace, int argc, const char **argv)
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{
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char *trace_file;
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int trace_fd;
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char buf[4096];
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struct pollfd pollfd = {
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.events = POLLIN,
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};
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if (geteuid() != 0) {
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pr_err("ftrace only works for root!\n");
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return -1;
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}
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signal(SIGINT, sig_handler);
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signal(SIGUSR1, sig_handler);
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signal(SIGCHLD, sig_handler);
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signal(SIGPIPE, sig_handler);
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if (reset_tracing_files(ftrace) < 0)
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goto out;
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/* reset ftrace buffer */
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if (write_tracing_file("trace", "0") < 0)
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goto out;
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if (argc && perf_evlist__prepare_workload(ftrace->evlist,
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&ftrace->target, argv, false,
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ftrace__workload_exec_failed_signal) < 0) {
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goto out;
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}
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if (set_tracing_pid(ftrace) < 0) {
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pr_err("failed to set ftrace pid\n");
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goto out_reset;
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}
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if (set_tracing_cpu(ftrace) < 0) {
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pr_err("failed to set tracing cpumask\n");
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goto out_reset;
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}
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if (write_tracing_file("current_tracer", ftrace->tracer) < 0) {
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pr_err("failed to set current_tracer to %s\n", ftrace->tracer);
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goto out_reset;
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}
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trace_file = get_tracing_file("trace_pipe");
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if (!trace_file) {
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pr_err("failed to open trace_pipe\n");
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goto out_reset;
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}
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trace_fd = open(trace_file, O_RDONLY);
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put_tracing_file(trace_file);
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if (trace_fd < 0) {
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pr_err("failed to open trace_pipe\n");
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goto out_reset;
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}
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fcntl(trace_fd, F_SETFL, O_NONBLOCK);
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pollfd.fd = trace_fd;
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if (write_tracing_file("tracing_on", "1") < 0) {
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pr_err("can't enable tracing\n");
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goto out_close_fd;
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}
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setup_pager();
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perf_evlist__start_workload(ftrace->evlist);
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while (!done) {
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if (poll(&pollfd, 1, -1) < 0)
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break;
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if (pollfd.revents & POLLIN) {
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int n = read(trace_fd, buf, sizeof(buf));
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if (n < 0)
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break;
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if (fwrite(buf, n, 1, stdout) != 1)
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break;
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}
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}
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write_tracing_file("tracing_on", "0");
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/* read remaining buffer contents */
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while (true) {
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int n = read(trace_fd, buf, sizeof(buf));
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if (n <= 0)
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break;
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if (fwrite(buf, n, 1, stdout) != 1)
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break;
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}
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out_close_fd:
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close(trace_fd);
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out_reset:
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reset_tracing_files(ftrace);
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out:
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return done ? 0 : -1;
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}
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static int perf_ftrace_config(const char *var, const char *value, void *cb)
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{
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struct perf_ftrace *ftrace = cb;
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if (prefixcmp(var, "ftrace."))
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return 0;
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if (strcmp(var, "ftrace.tracer"))
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return -1;
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if (!strcmp(value, "function_graph") ||
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!strcmp(value, "function")) {
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ftrace->tracer = value;
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return 0;
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}
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pr_err("Please select \"function_graph\" (default) or \"function\"\n");
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return -1;
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}
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int cmd_ftrace(int argc, const char **argv)
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{
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int ret;
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struct perf_ftrace ftrace = {
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.tracer = DEFAULT_TRACER,
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.target = { .uid = UINT_MAX, },
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};
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const char * const ftrace_usage[] = {
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"perf ftrace [<options>] [<command>]",
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"perf ftrace [<options>] -- <command> [<options>]",
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NULL
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};
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const struct option ftrace_options[] = {
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OPT_STRING('t', "tracer", &ftrace.tracer, "tracer",
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"tracer to use: function_graph(default) or function"),
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OPT_STRING('p', "pid", &ftrace.target.pid, "pid",
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"trace on existing process id"),
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OPT_INCR('v', "verbose", &verbose,
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"be more verbose"),
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OPT_BOOLEAN('a', "all-cpus", &ftrace.target.system_wide,
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"system-wide collection from all CPUs"),
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OPT_STRING('C', "cpu", &ftrace.target.cpu_list, "cpu",
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"list of cpus to monitor"),
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OPT_END()
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};
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ret = perf_config(perf_ftrace_config, &ftrace);
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if (ret < 0)
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return -1;
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argc = parse_options(argc, argv, ftrace_options, ftrace_usage,
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PARSE_OPT_STOP_AT_NON_OPTION);
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if (!argc && target__none(&ftrace.target))
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usage_with_options(ftrace_usage, ftrace_options);
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ret = target__validate(&ftrace.target);
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if (ret) {
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char errbuf[512];
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target__strerror(&ftrace.target, ret, errbuf, 512);
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pr_err("%s\n", errbuf);
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return -EINVAL;
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}
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ftrace.evlist = perf_evlist__new();
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if (ftrace.evlist == NULL)
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return -ENOMEM;
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ret = perf_evlist__create_maps(ftrace.evlist, &ftrace.target);
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if (ret < 0)
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goto out_delete_evlist;
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ret = __cmd_ftrace(&ftrace, argc, argv);
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out_delete_evlist:
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perf_evlist__delete(ftrace.evlist);
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return ret;
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}
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