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-rw-r--r--tools/bpf/bpftool/btf_dumper.c42
-rw-r--r--tools/bpf/bpftool/prog.c159
-rw-r--r--tools/bpf/bpftool/struct_ops.c2
-rw-r--r--tools/lib/bpf/libbpf.h3
-rw-r--r--tools/perf/Documentation/perf.data-file-format.txt2
-rw-r--r--tools/perf/util/Build1
-rw-r--r--tools/perf/util/annotate.c3
-rw-r--r--tools/perf/util/bpf-event.c41
-rw-r--r--tools/perf/util/bpf-event.h2
-rw-r--r--tools/perf/util/bpf-utils.c261
-rw-r--r--tools/perf/util/bpf-utils.h76
-rw-r--r--tools/perf/util/bpf_counter.c6
-rw-r--r--tools/perf/util/dso.c1
-rw-r--r--tools/perf/util/env.c1
-rw-r--r--tools/perf/util/header.c13
15 files changed, 528 insertions, 85 deletions
diff --git a/tools/bpf/bpftool/btf_dumper.c b/tools/bpf/bpftool/btf_dumper.c
index 9c25286a5c73..f5dddf8ef404 100644
--- a/tools/bpf/bpftool/btf_dumper.c
+++ b/tools/bpf/bpftool/btf_dumper.c
@@ -32,14 +32,16 @@ static int dump_prog_id_as_func_ptr(const struct btf_dumper *d,
const struct btf_type *func_proto,
__u32 prog_id)
{
- struct bpf_prog_info_linear *prog_info = NULL;
const struct btf_type *func_type;
+ int prog_fd = -1, func_sig_len;
+ struct bpf_prog_info info = {};
+ __u32 info_len = sizeof(info);
const char *prog_name = NULL;
- struct bpf_func_info *finfo;
struct btf *prog_btf = NULL;
- struct bpf_prog_info *info;
- int prog_fd, func_sig_len;
+ struct bpf_func_info finfo;
+ __u32 finfo_rec_size;
char prog_str[1024];
+ int err;
/* Get the ptr's func_proto */
func_sig_len = btf_dump_func(d->btf, prog_str, func_proto, NULL, 0,
@@ -52,25 +54,30 @@ static int dump_prog_id_as_func_ptr(const struct btf_dumper *d,
/* Get the bpf_prog's name. Obtain from func_info. */
prog_fd = bpf_prog_get_fd_by_id(prog_id);
- if (prog_fd == -1)
+ if (prog_fd < 0)
goto print;
- prog_info = bpf_program__get_prog_info_linear(prog_fd,
- 1UL << BPF_PROG_INFO_FUNC_INFO);
- close(prog_fd);
- if (IS_ERR(prog_info)) {
- prog_info = NULL;
+ err = bpf_obj_get_info_by_fd(prog_fd, &info, &info_len);
+ if (err)
goto print;
- }
- info = &prog_info->info;
- if (!info->btf_id || !info->nr_func_info)
+ if (!info.btf_id || !info.nr_func_info)
+ goto print;
+
+ finfo_rec_size = info.func_info_rec_size;
+ memset(&info, 0, sizeof(info));
+ info.nr_func_info = 1;
+ info.func_info_rec_size = finfo_rec_size;
+ info.func_info = ptr_to_u64(&finfo);
+
+ err = bpf_obj_get_info_by_fd(prog_fd, &info, &info_len);
+ if (err)
goto print;
- prog_btf = btf__load_from_kernel_by_id(info->btf_id);
+
+ prog_btf = btf__load_from_kernel_by_id(info.btf_id);
if (libbpf_get_error(prog_btf))
goto print;
- finfo = u64_to_ptr(info->func_info);
- func_type = btf__type_by_id(prog_btf, finfo->type_id);
+ func_type = btf__type_by_id(prog_btf, finfo.type_id);
if (!func_type || !btf_is_func(func_type))
goto print;
@@ -92,7 +99,8 @@ print:
prog_str[sizeof(prog_str) - 1] = '\0';
jsonw_string(d->jw, prog_str);
btf__free(prog_btf);
- free(prog_info);
+ if (prog_fd >= 0)
+ close(prog_fd);
return 0;
}
diff --git a/tools/bpf/bpftool/prog.c b/tools/bpf/bpftool/prog.c
index 515d22952602..dea7a49ec26e 100644
--- a/tools/bpf/bpftool/prog.c
+++ b/tools/bpf/bpftool/prog.c
@@ -100,6 +100,76 @@ static enum bpf_attach_type parse_attach_type(const char *str)
return __MAX_BPF_ATTACH_TYPE;
}
+static int prep_prog_info(struct bpf_prog_info *const info, enum dump_mode mode,
+ void **info_data, size_t *const info_data_sz)
+{
+ struct bpf_prog_info holder = {};
+ size_t needed = 0;
+ void *ptr;
+
+ if (mode == DUMP_JITED) {
+ holder.jited_prog_len = info->jited_prog_len;
+ needed += info->jited_prog_len;
+ } else {
+ holder.xlated_prog_len = info->xlated_prog_len;
+ needed += info->xlated_prog_len;
+ }
+
+ holder.nr_jited_ksyms = info->nr_jited_ksyms;
+ needed += info->nr_jited_ksyms * sizeof(__u64);
+
+ holder.nr_jited_func_lens = info->nr_jited_func_lens;
+ needed += info->nr_jited_func_lens * sizeof(__u32);
+
+ holder.nr_func_info = info->nr_func_info;
+ holder.func_info_rec_size = info->func_info_rec_size;
+ needed += info->nr_func_info * info->func_info_rec_size;
+
+ holder.nr_line_info = info->nr_line_info;
+ holder.line_info_rec_size = info->line_info_rec_size;
+ needed += info->nr_line_info * info->line_info_rec_size;
+
+ holder.nr_jited_line_info = info->nr_jited_line_info;
+ holder.jited_line_info_rec_size = info->jited_line_info_rec_size;
+ needed += info->nr_jited_line_info * info->jited_line_info_rec_size;
+
+ if (needed > *info_data_sz) {
+ ptr = realloc(*info_data, needed);
+ if (!ptr)
+ return -1;
+
+ *info_data = ptr;
+ *info_data_sz = needed;
+ }
+ ptr = *info_data;
+
+ if (mode == DUMP_JITED) {
+ holder.jited_prog_insns = ptr_to_u64(ptr);
+ ptr += holder.jited_prog_len;
+ } else {
+ holder.xlated_prog_insns = ptr_to_u64(ptr);
+ ptr += holder.xlated_prog_len;
+ }
+
+ holder.jited_ksyms = ptr_to_u64(ptr);
+ ptr += holder.nr_jited_ksyms * sizeof(__u64);
+
+ holder.jited_func_lens = ptr_to_u64(ptr);
+ ptr += holder.nr_jited_func_lens * sizeof(__u32);
+
+ holder.func_info = ptr_to_u64(ptr);
+ ptr += holder.nr_func_info * holder.func_info_rec_size;
+
+ holder.line_info = ptr_to_u64(ptr);
+ ptr += holder.nr_line_info * holder.line_info_rec_size;
+
+ holder.jited_line_info = ptr_to_u64(ptr);
+ ptr += holder.nr_jited_line_info * holder.jited_line_info_rec_size;
+
+ *info = holder;
+ return 0;
+}
+
static void print_boot_time(__u64 nsecs, char *buf, unsigned int size)
{
struct timespec real_time_ts, boot_time_ts;
@@ -803,16 +873,18 @@ prog_dump(struct bpf_prog_info *info, enum dump_mode mode,
static int do_dump(int argc, char **argv)
{
- struct bpf_prog_info_linear *info_linear;
+ struct bpf_prog_info info;
+ __u32 info_len = sizeof(info);
+ size_t info_data_sz = 0;
+ void *info_data = NULL;
char *filepath = NULL;
bool opcodes = false;
bool visual = false;
enum dump_mode mode;
bool linum = false;
- int *fds = NULL;
int nb_fds, i = 0;
+ int *fds = NULL;
int err = -1;
- __u64 arrays;
if (is_prefix(*argv, "jited")) {
if (disasm_init())
@@ -872,43 +944,44 @@ static int do_dump(int argc, char **argv)
goto exit_close;
}
- if (mode == DUMP_JITED)
- arrays = 1UL << BPF_PROG_INFO_JITED_INSNS;
- else
- arrays = 1UL << BPF_PROG_INFO_XLATED_INSNS;
-
- arrays |= 1UL << BPF_PROG_INFO_JITED_KSYMS;
- arrays |= 1UL << BPF_PROG_INFO_JITED_FUNC_LENS;
- arrays |= 1UL << BPF_PROG_INFO_FUNC_INFO;
- arrays |= 1UL << BPF_PROG_INFO_LINE_INFO;
- arrays |= 1UL << BPF_PROG_INFO_JITED_LINE_INFO;
-
if (json_output && nb_fds > 1)
jsonw_start_array(json_wtr); /* root array */
for (i = 0; i < nb_fds; i++) {
- info_linear = bpf_program__get_prog_info_linear(fds[i], arrays);
- if (IS_ERR_OR_NULL(info_linear)) {
+ memset(&info, 0, sizeof(info));
+
+ err = bpf_obj_get_info_by_fd(fds[i], &info, &info_len);
+ if (err) {
+ p_err("can't get prog info: %s", strerror(errno));
+ break;
+ }
+
+ err = prep_prog_info(&info, mode, &info_data, &info_data_sz);
+ if (err) {
+ p_err("can't grow prog info_data");
+ break;
+ }
+
+ err = bpf_obj_get_info_by_fd(fds[i], &info, &info_len);
+ if (err) {
p_err("can't get prog info: %s", strerror(errno));
break;
}
if (json_output && nb_fds > 1) {
jsonw_start_object(json_wtr); /* prog object */
- print_prog_header_json(&info_linear->info);
+ print_prog_header_json(&info);
jsonw_name(json_wtr, "insns");
} else if (nb_fds > 1) {
- print_prog_header_plain(&info_linear->info);
+ print_prog_header_plain(&info);
}
- err = prog_dump(&info_linear->info, mode, filepath, opcodes,
- visual, linum);
+ err = prog_dump(&info, mode, filepath, opcodes, visual, linum);
if (json_output && nb_fds > 1)
jsonw_end_object(json_wtr); /* prog object */
else if (i != nb_fds - 1 && nb_fds > 1)
printf("\n");
- free(info_linear);
if (err)
break;
close(fds[i]);
@@ -920,6 +993,7 @@ exit_close:
for (; i < nb_fds; i++)
close(fds[i]);
exit_free:
+ free(info_data);
free(fds);
return err;
}
@@ -2016,41 +2090,58 @@ static void profile_print_readings(void)
static char *profile_target_name(int tgt_fd)
{
- struct bpf_prog_info_linear *info_linear;
- struct bpf_func_info *func_info;
+ struct bpf_func_info func_info;
+ struct bpf_prog_info info = {};
+ __u32 info_len = sizeof(info);
const struct btf_type *t;
+ __u32 func_info_rec_size;
struct btf *btf = NULL;
char *name = NULL;
+ int err;
- info_linear = bpf_program__get_prog_info_linear(
- tgt_fd, 1UL << BPF_PROG_INFO_FUNC_INFO);
- if (IS_ERR_OR_NULL(info_linear)) {
- p_err("failed to get info_linear for prog FD %d", tgt_fd);
- return NULL;
+ err = bpf_obj_get_info_by_fd(tgt_fd, &info, &info_len);
+ if (err) {
+ p_err("failed to bpf_obj_get_info_by_fd for prog FD %d", tgt_fd);
+ goto out;
}
- if (info_linear->info.btf_id == 0) {
+ if (info.btf_id == 0) {
p_err("prog FD %d doesn't have valid btf", tgt_fd);
goto out;
}
- btf = btf__load_from_kernel_by_id(info_linear->info.btf_id);
+ func_info_rec_size = info.func_info_rec_size;
+ if (info.nr_func_info == 0) {
+ p_err("bpf_obj_get_info_by_fd for prog FD %d found 0 func_info", tgt_fd);
+ goto out;
+ }
+
+ memset(&info, 0, sizeof(info));
+ info.nr_func_info = 1;
+ info.func_info_rec_size = func_info_rec_size;
+ info.func_info = ptr_to_u64(&func_info);
+
+ err = bpf_obj_get_info_by_fd(tgt_fd, &info, &info_len);
+ if (err) {
+ p_err("failed to get func_info for prog FD %d", tgt_fd);
+ goto out;
+ }
+
+ btf = btf__load_from_kernel_by_id(info.btf_id);
if (libbpf_get_error(btf)) {
p_err("failed to load btf for prog FD %d", tgt_fd);
goto out;
}
- func_info = u64_to_ptr(info_linear->info.func_info);
- t = btf__type_by_id(btf, func_info[0].type_id);
+ t = btf__type_by_id(btf, func_info.type_id);
if (!t) {
p_err("btf %d doesn't have type %d",
- info_linear->info.btf_id, func_info[0].type_id);
+ info.btf_id, func_info.type_id);
goto out;
}
name = strdup(btf__name_by_offset(btf, t->name_off));
out:
btf__free(btf);
- free(info_linear);
return name;
}
diff --git a/tools/bpf/bpftool/struct_ops.c b/tools/bpf/bpftool/struct_ops.c
index ab2d2290569a..20f803dce2e4 100644
--- a/tools/bpf/bpftool/struct_ops.c
+++ b/tools/bpf/bpftool/struct_ops.c
@@ -252,7 +252,7 @@ static struct res do_one_id(const char *id_str, work_func func, void *data,
}
fd = bpf_map_get_fd_by_id(id);
- if (fd == -1) {
+ if (fd < 0) {
p_err("can't get map by id (%lu): %s", id, strerror(errno));
res.nr_errs++;
return res;
diff --git a/tools/lib/bpf/libbpf.h b/tools/lib/bpf/libbpf.h
index 9de0f299706b..797f5f8a0e20 100644
--- a/tools/lib/bpf/libbpf.h
+++ b/tools/lib/bpf/libbpf.h
@@ -918,12 +918,15 @@ struct bpf_prog_info_linear {
__u8 data[];
};
+LIBBPF_DEPRECATED_SINCE(0, 6, "use a custom linear prog_info wrapper")
LIBBPF_API struct bpf_prog_info_linear *
bpf_program__get_prog_info_linear(int fd, __u64 arrays);
+LIBBPF_DEPRECATED_SINCE(0, 6, "use a custom linear prog_info wrapper")
LIBBPF_API void
bpf_program__bpil_addr_to_offs(struct bpf_prog_info_linear *info_linear);
+LIBBPF_DEPRECATED_SINCE(0, 6, "use a custom linear prog_info wrapper")
LIBBPF_API void
bpf_program__bpil_offs_to_addr(struct bpf_prog_info_linear *info_linear);
diff --git a/tools/perf/Documentation/perf.data-file-format.txt b/tools/perf/Documentation/perf.data-file-format.txt
index e6ff8c898ada..f56d0e0fbff6 100644
--- a/tools/perf/Documentation/perf.data-file-format.txt
+++ b/tools/perf/Documentation/perf.data-file-format.txt
@@ -346,7 +346,7 @@ to special needs.
HEADER_BPF_PROG_INFO = 25,
-struct bpf_prog_info_linear, which contains detailed information about
+struct perf_bpil, which contains detailed information about
a BPF program, including type, id, tag, jited/xlated instructions, etc.
HEADER_BPF_BTF = 26,
diff --git a/tools/perf/util/Build b/tools/perf/util/Build
index f2914d5bed6e..ee42da1d3639 100644
--- a/tools/perf/util/Build
+++ b/tools/perf/util/Build
@@ -201,6 +201,7 @@ endif
perf-y += perf-hooks.o
perf-$(CONFIG_LIBBPF) += bpf-event.o
+perf-$(CONFIG_LIBBPF) += bpf-utils.o
perf-$(CONFIG_CXX) += c++/
diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c
index 0bae061b2d6d..f0e5a236b7e3 100644
--- a/tools/perf/util/annotate.c
+++ b/tools/perf/util/annotate.c
@@ -28,6 +28,7 @@
#include "evsel.h"
#include "evlist.h"
#include "bpf-event.h"
+#include "bpf-utils.h"
#include "block-range.h"
#include "string2.h"
#include "util/event.h"
@@ -1700,12 +1701,12 @@ static int symbol__disassemble_bpf(struct symbol *sym,
{
struct annotation *notes = symbol__annotation(sym);
struct annotation_options *opts = args->options;
- struct bpf_prog_info_linear *info_linear;
struct bpf_prog_linfo *prog_linfo = NULL;
struct bpf_prog_info_node *info_node;
int len = sym->end - sym->start;
disassembler_ftype disassemble;
struct map *map = args->ms.map;
+ struct perf_bpil *info_linear;
struct disassemble_info info;
struct dso *dso = map->dso;
int pc = 0, count, sub_id;
diff --git a/tools/perf/util/bpf-event.c b/tools/perf/util/bpf-event.c
index 388847bab6d9..a27badb0a53a 100644
--- a/tools/perf/util/bpf-event.c
+++ b/tools/perf/util/bpf-event.c
@@ -10,6 +10,7 @@
#include <internal/lib.h>
#include <symbol/kallsyms.h>
#include "bpf-event.h"
+#include "bpf-utils.h"
#include "debug.h"
#include "dso.h"
#include "symbol.h"
@@ -32,8 +33,6 @@ struct btf * __weak btf__load_from_kernel_by_id(__u32 id)
return err ? ERR_PTR(err) : btf;
}
-#define ptr_to_u64(ptr) ((__u64)(unsigned long)(ptr))
-
static int snprintf_hex(char *buf, size_t size, unsigned char *data, size_t len)
{
int ret = 0;
@@ -48,9 +47,9 @@ static int machine__process_bpf_event_load(struct machine *machine,
union perf_event *event,
struct perf_sample *sample __maybe_unused)
{
- struct bpf_prog_info_linear *info_linear;
struct bpf_prog_info_node *info_node;
struct perf_env *env = machine->env;
+ struct perf_bpil *info_linear;
int id = event->bpf.id;
unsigned int i;
@@ -175,9 +174,9 @@ static int perf_event__synthesize_one_bpf_prog(struct perf_session *session,
{
struct perf_record_ksymbol *ksymbol_event = &event->ksymbol;
struct perf_record_bpf_event *bpf_event = &event->bpf;
- struct bpf_prog_info_linear *info_linear;
struct perf_tool *tool = session->tool;
struct bpf_prog_info_node *info_node;
+ struct perf_bpil *info_linear;
struct bpf_prog_info *info;
struct btf *btf = NULL;
struct perf_env *env;
@@ -191,15 +190,15 @@ static int perf_event__synthesize_one_bpf_prog(struct perf_session *session,
*/
env = session->data ? &session->header.env : &perf_env;
- arrays = 1UL << BPF_PROG_INFO_JITED_KSYMS;
- arrays |= 1UL << BPF_PROG_INFO_JITED_FUNC_LENS;
- arrays |= 1UL << BPF_PROG_INFO_FUNC_INFO;
- arrays |= 1UL << BPF_PROG_INFO_PROG_TAGS;
- arrays |= 1UL << BPF_PROG_INFO_JITED_INSNS;
- arrays |= 1UL << BPF_PROG_INFO_LINE_INFO;
- arrays |= 1UL << BPF_PROG_INFO_JITED_LINE_INFO;
+ arrays = 1UL << PERF_BPIL_JITED_KSYMS;
+ arrays |= 1UL << PERF_BPIL_JITED_FUNC_LENS;
+ arrays |= 1UL << PERF_BPIL_FUNC_INFO;
+ arrays |= 1UL << PERF_BPIL_PROG_TAGS;
+ arrays |= 1UL << PERF_BPIL_JITED_INSNS;
+ arrays |= 1UL << PERF_BPIL_LINE_INFO;
+ arrays |= 1UL << PERF_BPIL_JITED_LINE_INFO;
- info_linear = bpf_program__get_prog_info_linear(fd, arrays);
+ info_linear = get_bpf_prog_info_linear(fd, arrays);
if (IS_ERR_OR_NULL(info_linear)) {
info_linear = NULL;
pr_debug("%s: failed to get BPF program info. aborting\n", __func__);
@@ -452,8 +451,8 @@ int perf_event__synthesize_bpf_events(struct perf_session *session,
static void perf_env__add_bpf_info(struct perf_env *env, u32 id)
{
- struct bpf_prog_info_linear *info_linear;
struct bpf_prog_info_node *info_node;
+ struct perf_bpil *info_linear;
struct btf *btf = NULL;
u64 arrays;
u32 btf_id;
@@ -463,15 +462,15 @@ static void perf_env__add_bpf_info(struct perf_env *env, u32 id)
if (fd < 0)
return;
- arrays = 1UL << BPF_PROG_INFO_JITED_KSYMS;
- arrays |= 1UL << BPF_PROG_INFO_JITED_FUNC_LENS;
- arrays |= 1UL << BPF_PROG_INFO_FUNC_INFO;
- arrays |= 1UL << BPF_PROG_INFO_PROG_TAGS;
- arrays |= 1UL << BPF_PROG_INFO_JITED_INSNS;
- arrays |= 1UL << BPF_PROG_INFO_LINE_INFO;
- arrays |= 1UL << BPF_PROG_INFO_JITED_LINE_INFO;
+ arrays = 1UL << PERF_BPIL_JITED_KSYMS;
+ arrays |= 1UL << PERF_BPIL_JITED_FUNC_LENS;
+ arrays |= 1UL << PERF_BPIL_FUNC_INFO;
+ arrays |= 1UL << PERF_BPIL_PROG_TAGS;
+ arrays |= 1UL << PERF_BPIL_JITED_INSNS;
+ arrays |= 1UL << PERF_BPIL_LINE_INFO;
+ arrays |= 1UL << PERF_BPIL_JITED_LINE_INFO;
- info_linear = bpf_program__get_prog_info_linear(fd, arrays);
+ info_linear = get_bpf_prog_info_linear(fd, arrays);
if (IS_ERR_OR_NULL(info_linear)) {
pr_debug("%s: failed to get BPF program info. aborting\n", __func__);
goto out;
diff --git a/tools/perf/util/bpf-event.h b/tools/perf/util/bpf-event.h
index 68f315c3df5b..144a8a24cc69 100644
--- a/tools/perf/util/bpf-event.h
+++ b/tools/perf/util/bpf-event.h
@@ -19,7 +19,7 @@ struct evlist;
struct target;
struct bpf_prog_info_node {
- struct bpf_prog_info_linear *info_linear;
+ struct perf_bpil *info_linear;
struct rb_node rb_node;
};
diff --git a/tools/perf/util/bpf-utils.c b/tools/perf/util/bpf-utils.c
new file mode 100644
index 000000000000..e271e05e51bc
--- /dev/null
+++ b/tools/perf/util/bpf-utils.c
@@ -0,0 +1,261 @@
+// SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
+
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE
+#endif
+
+#include <errno.h>
+#include <stdlib.h>
+#include <linux/err.h>
+#include <linux/kernel.h>
+#include <bpf/bpf.h>
+#include "bpf-utils.h"
+#include "debug.h"
+
+struct bpil_array_desc {
+ int array_offset; /* e.g. offset of jited_prog_insns */
+ int count_offset; /* e.g. offset of jited_prog_len */
+ int size_offset; /* > 0: offset of rec size,
+ * < 0: fix size of -size_offset
+ */
+};
+
+static struct bpil_array_desc bpil_array_desc[] = {
+ [PERF_BPIL_JITED_INSNS] = {
+ offsetof(struct bpf_prog_info, jited_prog_insns),
+ offsetof(struct bpf_prog_info, jited_prog_len),
+ -1,
+ },
+ [PERF_BPIL_XLATED_INSNS] = {
+ offsetof(struct bpf_prog_info, xlated_prog_insns),
+ offsetof(struct bpf_prog_info, xlated_prog_len),
+ -1,
+ },
+ [PERF_BPIL_MAP_IDS] = {
+ offsetof(struct bpf_prog_info, map_ids),
+ offsetof(struct bpf_prog_info, nr_map_ids),
+ -(int)sizeof(__u32),
+ },
+ [PERF_BPIL_JITED_KSYMS] = {
+ offsetof(struct bpf_prog_info, jited_ksyms),
+ offsetof(struct bpf_prog_info, nr_jited_ksyms),
+ -(int)sizeof(__u64),
+ },
+ [PERF_BPIL_JITED_FUNC_LENS] = {
+ offsetof(struct bpf_prog_info, jited_func_lens),
+ offsetof(struct bpf_prog_info, nr_jited_func_lens),
+ -(int)sizeof(__u32),
+ },
+ [PERF_BPIL_FUNC_INFO] = {
+ offsetof(struct bpf_prog_info, func_info),
+ offsetof(struct bpf_prog_info, nr_func_info),
+ offsetof(struct bpf_prog_info, func_info_rec_size),
+ },
+ [PERF_BPIL_LINE_INFO] = {
+ offsetof(struct bpf_prog_info, line_info),
+ offsetof(struct bpf_prog_info, nr_line_info),
+ offsetof(struct bpf_prog_info, line_info_rec_size),
+ },
+ [PERF_BPIL_JITED_LINE_INFO] = {
+ offsetof(struct bpf_prog_info, jited_line_info),
+ offsetof(struct bpf_prog_info, nr_jited_line_info),
+ offsetof(struct bpf_prog_info, jited_line_info_rec_size),
+ },
+ [PERF_BPIL_PROG_TAGS] = {
+ offsetof(struct bpf_prog_info, prog_tags),
+ offsetof(struct bpf_prog_info, nr_prog_tags),
+ -(int)sizeof(__u8) * BPF_TAG_SIZE,
+ },
+
+};
+
+static __u32 bpf_prog_info_read_offset_u32(struct bpf_prog_info *info,
+ int offset)
+{
+ __u32 *array = (__u32 *)info;
+
+ if (offset >= 0)
+ return array[offset / sizeof(__u32)];
+ return -(int)offset;
+}
+
+static __u64 bpf_prog_info_read_offset_u64(struct bpf_prog_info *info,
+ int offset)
+{
+ __u64 *array = (__u64 *)info;
+
+ if (offset >= 0)
+ return array[offset / sizeof(__u64)];
+ return -(int)offset;
+}
+
+static void bpf_prog_info_set_offset_u32(struct bpf_prog_info *info, int offset,
+ __u32 val)
+{
+ __u32 *array = (__u32 *)info;
+
+ if (offset >= 0)
+ array[offset / sizeof(__u32)] = val;
+}
+
+static void bpf_prog_info_set_offset_u64(struct bpf_prog_info *info, int offset,
+ __u64 val)
+{
+ __u64 *array = (__u64 *)info;
+
+ if (offset >= 0)
+ array[offset / sizeof(__u64)] = val;
+}
+
+struct perf_bpil *
+get_bpf_prog_info_linear(int fd, __u64 arrays)
+{
+ struct bpf_prog_info info = {};
+ struct perf_bpil *info_linear;
+ __u32 info_len = sizeof(info);
+ __u32 data_len = 0;
+ int i, err;
+ void *ptr;
+
+ if (arrays >> PERF_BPIL_LAST_ARRAY)
+ return ERR_PTR(-EINVAL);
+
+ /* step 1: get array dimensions */
+ err = bpf_obj_get_info_by_fd(fd, &info, &info_len);
+ if (err) {
+ pr_debug("can't get prog info: %s", strerror(errno));
+ return ERR_PTR(-EFAULT);
+ }
+
+ /* step 2: calculate total size of all arrays */
+ for (i = PERF_BPIL_FIRST_ARRAY; i < PERF_BPIL_LAST_ARRAY; ++i) {
+ bool include_array = (arrays & (1UL << i)) > 0;
+ struct bpil_array_desc *desc;
+ __u32 count, size;
+
+ desc = bpil_array_desc + i;
+
+ /* kernel is too old to support this field */
+ if (info_len < desc->array_offset + sizeof(__u32) ||
+ info_len < desc->count_offset + sizeof(__u32) ||
+ (desc->size_offset > 0 && info_len < (__u32)desc->size_offset))
+ include_array = false;
+
+ if (!include_array) {
+ arrays &= ~(1UL << i); /* clear the bit */
+ continue;
+ }
+
+ count = bpf_prog_info_read_offset_u32(&info, desc->count_offset);
+ size = bpf_prog_info_read_offset_u32(&info, desc->size_offset);
+
+ data_len += count * size;
+ }
+
+ /* step 3: allocate continuous memory */
+ data_len = roundup(data_len, sizeof(__u64));
+ info_linear = malloc(sizeof(struct perf_bpil) + data_len);
+ if (!info_linear)
+ return ERR_PTR(-ENOMEM);
+
+ /* step 4: fill data to info_linear->info */
+ info_linear->arrays = arrays;
+ memset(&info_linear->info, 0, sizeof(info));
+ ptr = info_linear->data;
+
+ for (i = PERF_BPIL_FIRST_ARRAY; i < PERF_BPIL_LAST_ARRAY; ++i) {
+ struct bpil_array_desc *desc;
+ __u32 count, size;
+
+ if ((arrays & (1UL << i)) == 0)
+ continue;
+
+ desc = bpil_array_desc + i;
+ count = bpf_prog_info_read_offset_u32(&info, desc->count_offset);
+ size = bpf_prog_info_read_offset_u32(&info, desc->size_offset);
+ bpf_prog_info_set_offset_u32(&info_linear->info,
+ desc->count_offset, count);
+ bpf_prog_info_set_offset_u32(&info_linear->info,
+ desc->size_offset, size);
+ bpf_prog_info_set_offset_u64(&info_linear->info,
+ desc->array_offset,
+ ptr_to_u64(ptr));
+ ptr += count * size;
+ }
+
+ /* step 5: call syscall again to get required arrays */
+ err = bpf_obj_get_info_by_fd(fd, &info_linear->info, &info_len);
+ if (err) {
+ pr_debug("can't get prog info: %s", strerror(errno));
+ free(info_linear);
+ return ERR_PTR(-EFAULT);
+ }
+
+ /* step 6: verify the data */
+ for (i = PERF_BPIL_FIRST_ARRAY; i < PERF_BPIL_LAST_ARRAY; ++i) {
+ struct bpil_array_desc *desc;
+ __u32 v1, v2;
+
+ if ((arrays & (1UL << i)) == 0)
+ continue;
+
+ desc = bpil_array_desc + i;
+ v1 = bpf_prog_info_read_offset_u32(&info, desc->count_offset);
+ v2 = bpf_prog_info_read_offset_u32(&info_linear->info,
+ desc->count_offset);
+ if (v1 != v2)
+ pr_warning("%s: mismatch in element count\n", __func__);
+
+ v1 = bpf_prog_info_read_offset_u32(&info, desc->size_offset);
+ v2 = bpf_prog_info_read_offset_u32(&info_linear->info,
+ desc->size_offset);
+ if (v1 != v2)
+ pr_warning("%s: mismatch in rec size\n", __func__);
+ }
+
+ /* step 7: update info_len and data_len */
+ info_linear->info_len = sizeof(struct bpf_prog_info);
+ info_linear->data_len = data_len;
+
+ return info_linear;
+}
+
+void bpil_addr_to_offs(struct perf_bpil *info_linear)
+{
+ int i;
+
+ for (i = PERF_BPIL_FIRST_ARRAY; i < PERF_BPIL_LAST_ARRAY; ++i) {
+ struct bpil_array_desc *desc;
+ __u64 addr, offs;
+
+ if ((info_linear->arrays & (1UL << i)) == 0)
+ continue;
+
+ desc = bpil_array_desc + i;
+ addr = bpf_prog_info_read_offset_u64(&info_linear->info,
+ desc->array_offset);
+ offs = addr - ptr_to_u64(info_linear->data);
+ bpf_prog_info_set_offset_u64(&info_linear->info,
+ desc->array_offset, offs);
+ }
+}
+
+void bpil_offs_to_addr(struct perf_bpil *info_linear)
+{
+ int i;
+
+ for (i = PERF_BPIL_FIRST_ARRAY; i < PERF_BPIL_LAST_ARRAY; ++i) {
+ struct bpil_array_desc *desc;
+ __u64 addr, offs;
+
+ if ((info_linear->arrays & (1UL << i)) == 0)
+ continue;
+
+ desc = bpil_array_desc + i;
+ offs = bpf_prog_info_read_offset_u64(&info_linear->info,
+ desc->array_offset);
+ addr = offs + ptr_to_u64(info_linear->data);
+ bpf_prog_info_set_offset_u64(&info_linear->info,
+ desc->array_offset, addr);
+ }
+}
diff --git a/tools/perf/util/bpf-utils.h b/tools/perf/util/bpf-utils.h
new file mode 100644
index 000000000000..86a5055cdfad
--- /dev/null
+++ b/tools/perf/util/bpf-utils.h
@@ -0,0 +1,76 @@
+/* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */
+
+#ifndef __PERF_BPF_UTILS_H
+#define __PERF_BPF_UTILS_H
+
+#define ptr_to_u64(ptr) ((__u64)(unsigned long)(ptr))
+
+#ifdef HAVE_LIBBPF_SUPPORT
+
+#include <bpf/libbpf.h>
+
+/*
+ * Get bpf_prog_info in continuous memory
+ *
+ * struct bpf_prog_info has multiple arrays. The user has option to choose
+ * arrays to fetch from kernel. The following APIs provide an uniform way to
+ * fetch these data. All arrays in bpf_prog_info are stored in a single
+ * continuous memory region. This makes it easy to store the info in a
+ * file.
+ *
+ * Before writing perf_bpil to files, it is necessary to
+ * translate pointers in bpf_prog_info to offsets. Helper functions
+ * bpil_addr_to_offs() and bpil_offs_to_addr()
+ * are introduced to switch between pointers and offsets.
+ *
+ * Examples:
+ * # To fetch map_ids and prog_tags:
+ * __u64 arrays = (1UL << PERF_BPIL_MAP_IDS) |
+ * (1UL << PERF_BPIL_PROG_TAGS);
+ * struct perf_bpil *info_linear =
+ * get_bpf_prog_info_linear(fd, arrays);
+ *
+ * # To save data in file
+ * bpil_addr_to_offs(info_linear);
+ * write(f, info_linear, sizeof(*info_linear) + info_linear->data_len);
+ *
+ * # To read data from file
+ * read(f, info_linear, <proper_size>);
+ * bpil_offs_to_addr(info_linear);
+ */
+enum perf_bpil_array_types {
+ PERF_BPIL_FIRST_ARRAY = 0,
+ PERF_BPIL_JITED_INSNS = 0,
+ PERF_BPIL_XLATED_INSNS,
+ PERF_BPIL_MAP_IDS,
+ PERF_BPIL_JITED_KSYMS,
+ PERF_BPIL_JITED_FUNC_LENS,
+ PERF_BPIL_FUNC_INFO,
+ PERF_BPIL_LINE_INFO,
+ PERF_BPIL_JITED_LINE_INFO,
+ PERF_BPIL_PROG_TAGS,
+ PERF_BPIL_LAST_ARRAY,
+};
+
+struct perf_bpil {
+ /* size of struct bpf_prog_info, when the tool is compiled */
+ __u32 info_len;
+ /* total bytes allocated for data, round up to 8 bytes */
+ __u32 data_len;
+ /* which arrays are included in data */
+ __u64 arrays;
+ struct bpf_prog_info info;
+ __u8 data[];
+};
+
+struct perf_bpil *
+get_bpf_prog_info_linear(int fd, __u64 arrays);
+
+void
+bpil_addr_to_offs(struct perf_bpil *info_linear);
+
+void
+bpil_offs_to_addr(struct perf_bpil *info_linear);
+
+#endif /* HAVE_LIBBPF_SUPPORT */
+#endif /* __PERF_BPF_UTILS_H */
diff --git a/tools/perf/util/bpf_counter.c b/tools/perf/util/bpf_counter.c
index ba0f20853651..2b04df8c5f87 100644
--- a/tools/perf/util/bpf_counter.c
+++ b/tools/perf/util/bpf_counter.c
@@ -13,6 +13,7 @@
#include <perf/bpf_perf.h>
#include "bpf_counter.h"
+#include "bpf-utils.h"
#include "counts.h"
#include "debug.h"
#include "evsel.h"
@@ -61,14 +62,13 @@ static int bpf_program_profiler__destroy(struct evsel *evsel)
static char *bpf_target_prog_name(int tgt_fd)
{
- struct bpf_prog_info_linear *info_linear;
struct bpf_func_info *func_info;
+ struct perf_bpil *info_linear;
const struct btf_type *t;
struct btf *btf = NULL;
char *name = NULL;
- info_linear = bpf_program__get_prog_info_linear(
- tgt_fd, 1UL << BPF_PROG_INFO_FUNC_INFO);
+ info_linear = get_bpf_prog_info_linear(tgt_fd, 1UL << PERF_BPIL_FUNC_INFO);
if (IS_ERR_OR_NULL(info_linear)) {
pr_debug("failed to get info_linear for prog FD %d\n", tgt_fd);
return NULL;
diff --git a/tools/perf/util/dso.c b/tools/perf/util/dso.c
index 9ed9a5676d35..9cc8a1772b4b 100644
--- a/tools/perf/util/dso.c
+++ b/tools/perf/util/dso.c
@@ -14,6 +14,7 @@
#ifdef HAVE_LIBBPF_SUPPORT
#include <bpf/libbpf.h>
#include "bpf-event.h"
+#include "bpf-utils.h"
#endif
#include "compress.h"
#include "env.h"
diff --git a/tools/perf/util/env.c b/tools/perf/util/env.c
index cf773f0dec38..17f1dd0680b4 100644
--- a/tools/perf/util/env.c
+++ b/tools/perf/util/env.c
@@ -16,6 +16,7 @@ struct perf_env perf_env;
#ifdef HAVE_LIBBPF_SUPPORT
#include "bpf-event.h"
+#include "bpf-utils.h"
#include <bpf/libbpf.h>
void perf_env__insert_bpf_prog_info(struct perf_env *env,
diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index 1c7414f66655..56511db8fa03 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -48,6 +48,7 @@
#include "util/util.h" // perf_exe()
#include "cputopo.h"
#include "bpf-event.h"
+#include "bpf-utils.h"
#include "clockid.h"
#include "pmu-hybrid.h"
@@ -1006,17 +1007,17 @@ static int write_bpf_prog_info(struct feat_fd *ff,
node = rb_entry(next, struct bpf_prog_info_node, rb_node);
next = rb_next(&node->rb_node);
- len = sizeof(struct bpf_prog_info_linear) +
+ len = sizeof(struct perf_bpil) +
node->info_linear->data_len;
/* before writing to file, translate address to offset */
- bpf_program__bpil_addr_to_offs(node->info_linear);
+ bpil_addr_to_offs(node->info_linear);
ret = do_write(ff, node->info_linear, len);
/*
* translate back to address even when do_write() fails,
* so that this function never changes the data.
*/
- bpf_program__bpil_offs_to_addr(node->info_linear);
+ bpil_offs_to_addr(node->info_linear);
if (ret < 0)
goto out;
}
@@ -3018,9 +3019,9 @@ static int process_dir_format(struct feat_fd *ff,
#ifdef HAVE_LIBBPF_SUPPORT
static int process_bpf_prog_info(struct feat_fd *ff, void *data __maybe_unused)
{
- struct bpf_prog_info_linear *info_linear;
struct bpf_prog_info_node *info_node;
struct perf_env *env = &ff->ph->env;
+ struct perf_bpil *info_linear;
u32 count, i;
int err = -1;
@@ -3049,7 +3050,7 @@ static int process_bpf_prog_info(struct feat_fd *ff, void *data __maybe_unused)
goto out;
}
- info_linear = malloc(sizeof(struct bpf_prog_info_linear) +
+ info_linear = malloc(sizeof(struct perf_bpil) +
data_len);
if (!info_linear)
goto out;
@@ -3071,7 +3072,7 @@ static int process_bpf_prog_info(struct feat_fd *ff, void *data __maybe_unused)
goto out;
/* after reading from file, translate offset to address */
- bpf_program__bpil_offs_to_addr(info_linear);
+ bpil_offs_to_addr(info_linear);
info_node->info_linear = info_linear;
perf_env__insert_bpf_prog_info(env, info_node);
}
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