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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
commit | 5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 (patch) | |
tree | a94efe259b9009378be6d90eb30d2b019d95c194 /tools/perf/util/trace-event-read.c | |
parent | Initial commit. (diff) | |
download | linux-upstream.tar.xz linux-upstream.zip |
Adding upstream version 5.10.209.upstream/5.10.209upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | tools/perf/util/trace-event-read.c | 478 |
1 files changed, 478 insertions, 0 deletions
diff --git a/tools/perf/util/trace-event-read.c b/tools/perf/util/trace-event-read.c new file mode 100644 index 000000000..8a01af783 --- /dev/null +++ b/tools/perf/util/trace-event-read.c @@ -0,0 +1,478 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2009, Steven Rostedt <srostedt@redhat.com> + */ +#include <dirent.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <stdarg.h> +#include <sys/types.h> +#include <sys/stat.h> +#include <sys/wait.h> +#include <sys/mman.h> +#include <fcntl.h> +#include <unistd.h> +#include <errno.h> + +#include "trace-event.h" +#include "debug.h" + +static int input_fd; + +static ssize_t trace_data_size; +static bool repipe; + +static int __do_read(int fd, void *buf, int size) +{ + int rsize = size; + + while (size) { + int ret = read(fd, buf, size); + + if (ret <= 0) + return -1; + + if (repipe) { + int retw = write(STDOUT_FILENO, buf, ret); + + if (retw <= 0 || retw != ret) { + pr_debug("repiping input file"); + return -1; + } + } + + size -= ret; + buf += ret; + } + + return rsize; +} + +static int do_read(void *data, int size) +{ + int r; + + r = __do_read(input_fd, data, size); + if (r <= 0) { + pr_debug("reading input file (size expected=%d received=%d)", + size, r); + return -1; + } + + trace_data_size += r; + + return r; +} + +/* If it fails, the next read will report it */ +static void skip(int size) +{ + char buf[BUFSIZ]; + int r; + + while (size) { + r = size > BUFSIZ ? BUFSIZ : size; + do_read(buf, r); + size -= r; + } +} + +static unsigned int read4(struct tep_handle *pevent) +{ + unsigned int data; + + if (do_read(&data, 4) < 0) + return 0; + return tep_read_number(pevent, &data, 4); +} + +static unsigned long long read8(struct tep_handle *pevent) +{ + unsigned long long data; + + if (do_read(&data, 8) < 0) + return 0; + return tep_read_number(pevent, &data, 8); +} + +static char *read_string(void) +{ + char buf[BUFSIZ]; + char *str = NULL; + int size = 0; + off_t r; + char c; + + for (;;) { + r = read(input_fd, &c, 1); + if (r < 0) { + pr_debug("reading input file"); + goto out; + } + + if (!r) { + pr_debug("no data"); + goto out; + } + + if (repipe) { + int retw = write(STDOUT_FILENO, &c, 1); + + if (retw <= 0 || retw != r) { + pr_debug("repiping input file string"); + goto out; + } + } + + buf[size++] = c; + + if (!c) + break; + } + + trace_data_size += size; + + str = malloc(size); + if (str) + memcpy(str, buf, size); +out: + return str; +} + +static int read_proc_kallsyms(struct tep_handle *pevent) +{ + unsigned int size; + + size = read4(pevent); + if (!size) + return 0; + /* + * Just skip it, now that we configure libtraceevent to use the + * tools/perf/ symbol resolver. + * + * We need to skip it so that we can continue parsing old perf.data + * files, that contains this /proc/kallsyms payload. + * + * Newer perf.data files will have just the 4-bytes zeros "kallsyms + * payload", so that older tools can continue reading it and interpret + * it as "no kallsyms payload is present". + */ + lseek(input_fd, size, SEEK_CUR); + trace_data_size += size; + return 0; +} + +static int read_ftrace_printk(struct tep_handle *pevent) +{ + unsigned int size; + char *buf; + + /* it can have 0 size */ + size = read4(pevent); + if (!size) + return 0; + + buf = malloc(size + 1); + if (buf == NULL) + return -1; + + if (do_read(buf, size) < 0) { + free(buf); + return -1; + } + + buf[size] = '\0'; + + parse_ftrace_printk(pevent, buf, size); + + free(buf); + return 0; +} + +static int read_header_files(struct tep_handle *pevent) +{ + unsigned long long size; + char *header_page; + char buf[BUFSIZ]; + int ret = 0; + + if (do_read(buf, 12) < 0) + return -1; + + if (memcmp(buf, "header_page", 12) != 0) { + pr_debug("did not read header page"); + return -1; + } + + size = read8(pevent); + + header_page = malloc(size); + if (header_page == NULL) + return -1; + + if (do_read(header_page, size) < 0) { + pr_debug("did not read header page"); + free(header_page); + return -1; + } + + if (!tep_parse_header_page(pevent, header_page, size, + tep_get_long_size(pevent))) { + /* + * The commit field in the page is of type long, + * use that instead, since it represents the kernel. + */ + tep_set_long_size(pevent, tep_get_header_page_size(pevent)); + } + free(header_page); + + if (do_read(buf, 13) < 0) + return -1; + + if (memcmp(buf, "header_event", 13) != 0) { + pr_debug("did not read header event"); + return -1; + } + + size = read8(pevent); + skip(size); + + return ret; +} + +static int read_ftrace_file(struct tep_handle *pevent, unsigned long long size) +{ + int ret; + char *buf; + + buf = malloc(size); + if (buf == NULL) { + pr_debug("memory allocation failure\n"); + return -1; + } + + ret = do_read(buf, size); + if (ret < 0) { + pr_debug("error reading ftrace file.\n"); + goto out; + } + + ret = parse_ftrace_file(pevent, buf, size); + if (ret < 0) + pr_debug("error parsing ftrace file.\n"); +out: + free(buf); + return ret; +} + +static int read_event_file(struct tep_handle *pevent, char *sys, + unsigned long long size) +{ + int ret; + char *buf; + + buf = malloc(size); + if (buf == NULL) { + pr_debug("memory allocation failure\n"); + return -1; + } + + ret = do_read(buf, size); + if (ret < 0) + goto out; + + ret = parse_event_file(pevent, buf, size, sys); + if (ret < 0) + pr_debug("error parsing event file.\n"); +out: + free(buf); + return ret; +} + +static int read_ftrace_files(struct tep_handle *pevent) +{ + unsigned long long size; + int count; + int i; + int ret; + + count = read4(pevent); + + for (i = 0; i < count; i++) { + size = read8(pevent); + ret = read_ftrace_file(pevent, size); + if (ret) + return ret; + } + return 0; +} + +static int read_event_files(struct tep_handle *pevent) +{ + unsigned long long size; + char *sys; + int systems; + int count; + int i,x; + int ret; + + systems = read4(pevent); + + for (i = 0; i < systems; i++) { + sys = read_string(); + if (sys == NULL) + return -1; + + count = read4(pevent); + + for (x=0; x < count; x++) { + size = read8(pevent); + ret = read_event_file(pevent, sys, size); + if (ret) { + free(sys); + return ret; + } + } + free(sys); + } + return 0; +} + +static int read_saved_cmdline(struct tep_handle *pevent) +{ + unsigned long long size; + char *buf; + int ret; + + /* it can have 0 size */ + size = read8(pevent); + if (!size) + return 0; + + buf = malloc(size + 1); + if (buf == NULL) { + pr_debug("memory allocation failure\n"); + return -1; + } + + ret = do_read(buf, size); + if (ret < 0) { + pr_debug("error reading saved cmdlines\n"); + goto out; + } + buf[ret] = '\0'; + + parse_saved_cmdline(pevent, buf, size); + ret = 0; +out: + free(buf); + return ret; +} + +ssize_t trace_report(int fd, struct trace_event *tevent, bool __repipe) +{ + char buf[BUFSIZ]; + char test[] = { 23, 8, 68 }; + char *version; + int show_version = 0; + int show_funcs = 0; + int show_printk = 0; + ssize_t size = -1; + int file_bigendian; + int host_bigendian; + int file_long_size; + int file_page_size; + struct tep_handle *pevent = NULL; + int err; + + repipe = __repipe; + input_fd = fd; + + if (do_read(buf, 3) < 0) + return -1; + if (memcmp(buf, test, 3) != 0) { + pr_debug("no trace data in the file"); + return -1; + } + + if (do_read(buf, 7) < 0) + return -1; + if (memcmp(buf, "tracing", 7) != 0) { + pr_debug("not a trace file (missing 'tracing' tag)"); + return -1; + } + + version = read_string(); + if (version == NULL) + return -1; + if (show_version) + printf("version = %s\n", version); + + if (do_read(buf, 1) < 0) { + free(version); + return -1; + } + file_bigendian = buf[0]; + host_bigendian = bigendian(); + + if (trace_event__init(tevent)) { + pr_debug("trace_event__init failed"); + goto out; + } + + pevent = tevent->pevent; + + tep_set_flag(pevent, TEP_NSEC_OUTPUT); + tep_set_file_bigendian(pevent, file_bigendian); + tep_set_local_bigendian(pevent, host_bigendian); + + if (do_read(buf, 1) < 0) + goto out; + file_long_size = buf[0]; + + file_page_size = read4(pevent); + if (!file_page_size) + goto out; + + tep_set_long_size(pevent, file_long_size); + tep_set_page_size(pevent, file_page_size); + + err = read_header_files(pevent); + if (err) + goto out; + err = read_ftrace_files(pevent); + if (err) + goto out; + err = read_event_files(pevent); + if (err) + goto out; + err = read_proc_kallsyms(pevent); + if (err) + goto out; + err = read_ftrace_printk(pevent); + if (err) + goto out; + if (atof(version) >= 0.6) { + err = read_saved_cmdline(pevent); + if (err) + goto out; + } + + size = trace_data_size; + repipe = false; + + if (show_funcs) { + tep_print_funcs(pevent); + } else if (show_printk) { + tep_print_printk(pevent); + } + + pevent = NULL; + +out: + if (pevent) + trace_event__cleanup(tevent); + free(version); + return size; +} |