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Date: Wed, 18 Nov 2020 20:50:45 -0800
From: Song Liu <songliubraving@...com>
To: <linux-kernel@...r.kernel.org>
CC: <kernel-team@...com>, <peterz@...radead.org>, <mingo@...hat.com>,
<acme@...nel.org>, <mark.rutland@....com>,
<alexander.shishkin@...ux.intel.com>, <jolsa@...hat.com>,
<namhyung@...nel.org>, Song Liu <songliubraving@...com>
Subject: [RFC 1/2] perf: support build BPF skeletons with perf
BPF programs are useful in perf to profile BPF programs. BPF skeleton is
by far the easiest way to write BPF tools. Enable building BPF skeletons
in util/bpf_skel. A dummy bpf skeleton is added. More bpf skeletons will
be added for different use cases.
Signed-off-by: Song Liu <songliubraving@...com>
---
tools/build/Makefile.feature | 3 +-
tools/perf/Makefile.config | 7 +++
tools/perf/Makefile.perf | 15 +++++-
tools/perf/util/bpf_skel/.gitignore | 3 ++
tools/perf/util/bpf_skel/Makefile | 71 ++++++++++++++++++++++++++++
tools/perf/util/bpf_skel/dummy.bpf.c | 19 ++++++++
6 files changed, 115 insertions(+), 3 deletions(-)
create mode 100644 tools/perf/util/bpf_skel/.gitignore
create mode 100644 tools/perf/util/bpf_skel/Makefile
create mode 100644 tools/perf/util/bpf_skel/dummy.bpf.c
diff --git a/tools/build/Makefile.feature b/tools/build/Makefile.feature
index 97cbfb31b7625..95a58b5564218 100644
--- a/tools/build/Makefile.feature
+++ b/tools/build/Makefile.feature
@@ -70,7 +70,8 @@ FEATURE_TESTS_BASIC := \
libaio \
libzstd \
disassembler-four-args \
- file-handle
+ file-handle \
+ clang-bpf-co-re
# FEATURE_TESTS_BASIC + FEATURE_TESTS_EXTRA is the complete list
# of all feature tests
diff --git a/tools/perf/Makefile.config b/tools/perf/Makefile.config
index ce8516e4de34f..1c2c0f4badd85 100644
--- a/tools/perf/Makefile.config
+++ b/tools/perf/Makefile.config
@@ -619,6 +619,13 @@ ifndef NO_LIBBPF
msg := $(warning BPF API too old. Please install recent kernel headers. BPF support in 'perf record' is disabled.)
NO_LIBBPF := 1
endif
+
+ ifndef NO_BPF_SKEL
+ ifeq ($(feature-clang-bpf-co-re), 1)
+ BUILD_BPF_SKEL := 1
+ $(call detected,CONFIG_PERF_BPF_SKEL)
+ endif
+ endif
endif
dwarf-post-unwind := 1
diff --git a/tools/perf/Makefile.perf b/tools/perf/Makefile.perf
index 7ce3f2e8b9c74..9a9fc71e2ffa4 100644
--- a/tools/perf/Makefile.perf
+++ b/tools/perf/Makefile.perf
@@ -126,6 +126,8 @@ include ../scripts/utilities.mak
#
# Define NO_LIBDEBUGINFOD if you do not want support debuginfod
#
+# Define NO_BPF_SKEL if you do not want build BPF skeletons
+#
# As per kernel Makefile, avoid funny character set dependencies
unexport LC_ALL
@@ -735,7 +737,8 @@ prepare: $(OUTPUT)PERF-VERSION-FILE $(OUTPUT)common-cmds.h archheaders $(drm_ioc
$(x86_arch_prctl_code_array) \
$(rename_flags_array) \
$(arch_errno_name_array) \
- $(sync_file_range_arrays)
+ $(sync_file_range_arrays) \
+ bpf-skel
$(OUTPUT)%.o: %.c prepare FORCE
$(Q)$(MAKE) -f $(srctree)/tools/build/Makefile.build dir=$(build-dir) $@
@@ -1008,7 +1011,15 @@ config-clean:
python-clean:
$(python-clean)
+ifdef BUILD_BPF_SKEL
+bpf-skel:
+ $(Q)$(MAKE) -C util/bpf_skel
+else
+bpf-skel:
+endif
+
clean:: $(LIBTRACEEVENT)-clean $(LIBAPI)-clean $(LIBBPF)-clean $(LIBSUBCMD)-clean $(LIBPERF)-clean config-clean fixdep-clean python-clean
+ $(call descend,util/bpf_skel,clean)
$(call QUIET_CLEAN, core-objs) $(RM) $(LIBPERF_A) $(OUTPUT)perf-archive $(OUTPUT)perf-with-kcore $(LANG_BINDINGS)
$(Q)find $(if $(OUTPUT),$(OUTPUT),.) -name '*.o' -delete -o -name '\.*.cmd' -delete -o -name '\.*.d' -delete
$(Q)$(RM) $(OUTPUT).config-detected
@@ -1071,7 +1082,7 @@ endif
FORCE:
-.PHONY: all install clean config-clean strip install-gtk
+.PHONY: all install clean config-clean strip install-gtk bpf-skel
.PHONY: shell_compatibility_test please_set_SHELL_PATH_to_a_more_modern_shell
.PHONY: $(GIT-HEAD-PHONY) TAGS tags cscope FORCE prepare
.PHONY: libtraceevent_plugins archheaders
diff --git a/tools/perf/util/bpf_skel/.gitignore b/tools/perf/util/bpf_skel/.gitignore
new file mode 100644
index 0000000000000..5263e9e6c5d83
--- /dev/null
+++ b/tools/perf/util/bpf_skel/.gitignore
@@ -0,0 +1,3 @@
+# SPDX-License-Identifier: GPL-2.0-only
+.tmp
+*.skel.h
\ No newline at end of file
diff --git a/tools/perf/util/bpf_skel/Makefile b/tools/perf/util/bpf_skel/Makefile
new file mode 100644
index 0000000000000..853bece088f4b
--- /dev/null
+++ b/tools/perf/util/bpf_skel/Makefile
@@ -0,0 +1,71 @@
+# SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
+SKEL_OUTPUT := $(abspath .)
+TMP_OUTPUT := $(abspath .tmp)
+CLANG ?= clang
+LLC ?= llc
+LLVM_STRIP ?= llvm-strip
+DEFAULT_BPFTOOL := $(TMP_OUTPUT)/sbin/bpftool
+BPFTOOL ?= $(DEFAULT_BPFTOOL)
+LIBBPF_SRC := $(abspath ../../../lib/bpf)
+BPFOBJ := $(TMP_OUTPUT)/libbpf.a
+BPF_INCLUDE := $(TMP_OUTPUT)
+INCLUDES := -I$(TMP_OUTPUT) -I$(BPF_INCLUDE) -I$(abspath ../../../lib) \
+ -I$(abspath ../../../include/uapi)
+CFLAGS := -g -Wall
+
+# Try to detect best kernel BTF source
+KERNEL_REL := $(shell uname -r)
+VMLINUX_BTF_PATHS := /sys/kernel/btf/vmlinux /boot/vmlinux-$(KERNEL_REL)
+VMLINUX_BTF_PATH := $(or $(VMLINUX_BTF),$(firstword \
+ $(wildcard $(VMLINUX_BTF_PATHS))))
+ifeq ($(V),1)
+Q =
+msg =
+else
+Q = @
+msg = @printf ' %-8s %s%s\n' "$(1)" "$(notdir $(2))" "$(if $(3), $(3))";
+MAKEFLAGS += --no-print-directory
+submake_extras := feature_display=0
+endif
+
+SKELETONS := $(SKEL_OUTPUT)/dummy.skel.h
+
+.DELETE_ON_ERROR:
+
+.PHONY: all clean
+all: $(SKELETONS)
+
+clean:
+ $(call msg,CLEAN,bpf_skel)
+ $(Q)rm -rf $(TMP_OUTPUT) $(SKELETONS)
+
+$(SKEL_OUTPUT)/%.skel.h: $(TMP_OUTPUT)/%.bpf.o | $(BPFTOOL)
+ $(call msg,GEN-SKEL,$@)
+ $(Q)$(BPFTOOL) gen skeleton $< > $@
+
+$(TMP_OUTPUT)/%.bpf.o: %.bpf.c $(TMP_OUTPUT)/vmlinux.h $(BPFOBJ) | $(TMP_OUTPUT)
+ $(call msg,BPF,$@)
+ $(Q)$(CLANG) -g -O2 -target bpf $(INCLUDES) \
+ -c $(filter %.c,$^) -o $@ && \
+ $(LLVM_STRIP) -g $@
+
+$(TMP_OUTPUT):
+ $(call msg,MKDIR,$@)
+ $(Q)mkdir -p $(TMP_OUTPUT)
+
+$(TMP_OUTPUT)/vmlinux.h: $(VMLINUX_BTF_PATH) | $(TMP_OUTPUT) $(BPFTOOL)
+ $(call msg,GEN,$@)
+ $(Q)if [ ! -e "$(VMLINUX_BTF_PATH)" ] ; then \
+ echo "Couldn't find kernel BTF; set VMLINUX_BTF to" \
+ "specify its location." >&2; \
+ exit 1;\
+ fi
+ $(Q)$(BPFTOOL) btf dump file $(VMLINUX_BTF_PATH) format c > $@
+
+$(BPFOBJ): $(wildcard $(LIBBPF_SRC)/*.[ch] $(LIBBPF_SRC)/Makefile) | $(TMP_OUTPUT)
+ $(Q)$(MAKE) $(submake_extras) -C $(LIBBPF_SRC) \
+ OUTPUT=$(abspath $(dir $@))/ $(abspath $@)
+
+$(DEFAULT_BPFTOOL): | $(TMP_OUTPUT)
+ $(Q)$(MAKE) $(submake_extras) -C ../../../bpf/bpftool \
+ prefix= OUTPUT=$(TMP_OUTPUT)/ DESTDIR=$(TMP_OUTPUT) install
diff --git a/tools/perf/util/bpf_skel/dummy.bpf.c b/tools/perf/util/bpf_skel/dummy.bpf.c
new file mode 100644
index 0000000000000..085fcee1f52cf
--- /dev/null
+++ b/tools/perf/util/bpf_skel/dummy.bpf.c
@@ -0,0 +1,19 @@
+// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+// Copyright (c) 2020 Facebook
+#include "vmlinux.h"
+#include <bpf/bpf_helpers.h>
+#include <bpf/bpf_tracing.h>
+
+struct {
+ __uint(type, BPF_MAP_TYPE_PERCPU_ARRAY);
+ __uint(key_size, sizeof(u32));
+ __uint(value_size, sizeof(u64));
+} counts SEC(".maps");
+
+SEC("fentry/dummy")
+int BPF_PROG(fentry_dummy)
+{
+ return 0;
+}
+
+char LICENSE[] SEC("license") = "Dual BSD/GPL";
--
2.24.1
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