diff options
Diffstat (limited to 'tools/perf/Makefile.perf')
| -rw-r--r-- | tools/perf/Makefile.perf | 45 |
1 files changed, 42 insertions, 3 deletions
diff --git a/tools/perf/Makefile.perf b/tools/perf/Makefile.perf index b1e62a621f92..097316ef38e6 100644 --- a/tools/perf/Makefile.perf +++ b/tools/perf/Makefile.perf @@ -132,6 +132,8 @@ include ../scripts/utilities.mak # Define EXTRA_TESTS to enable building extra tests useful mainly to perf # developers, such as: # x86 instruction decoder - new instructions test +# +# Define GEN_VMLINUX_H to generate vmlinux.h from the BTF. # As per kernel Makefile, avoid funny character set dependencies unexport LC_ALL @@ -197,6 +199,7 @@ FLEX ?= flex BISON ?= bison STRIP = strip AWK = awk +READELF ?= readelf # include Makefile.config by default and rule out # non-config cases @@ -1061,7 +1064,7 @@ $(SKEL_TMP_OUT) $(LIBAPI_OUTPUT) $(LIBBPF_OUTPUT) $(LIBPERF_OUTPUT) $(LIBSUBCMD_ ifdef BUILD_BPF_SKEL BPFTOOL := $(SKEL_TMP_OUT)/bootstrap/bpftool # Get Clang's default includes on this system, as opposed to those seen by -# '-target bpf'. This fixes "missing" files on some architectures/distros, +# '--target=bpf'. This fixes "missing" files on some architectures/distros, # such as asm/byteorder.h, asm/socket.h, asm/sockios.h, sys/cdefs.h etc. # # Use '-idirafter': Don't interfere with include mechanics except where the @@ -1084,8 +1087,44 @@ $(BPFTOOL): | $(SKEL_TMP_OUT) $(Q)CFLAGS= $(MAKE) -C ../bpf/bpftool \ OUTPUT=$(SKEL_TMP_OUT)/ bootstrap -$(SKEL_TMP_OUT)/%.bpf.o: util/bpf_skel/%.bpf.c $(LIBBPF) | $(SKEL_TMP_OUT) - $(QUIET_CLANG)$(CLANG) -g -O2 -target bpf -Wall -Werror $(BPF_INCLUDE) $(TOOLS_UAPI_INCLUDE) \ +# Paths to search for a kernel to generate vmlinux.h from. +VMLINUX_BTF_ELF_PATHS ?= $(if $(O),$(O)/vmlinux) \ + $(if $(KBUILD_OUTPUT),$(KBUILD_OUTPUT)/vmlinux) \ + ../../vmlinux \ + /boot/vmlinux-$(shell uname -r) + +# Paths to BTF information. +VMLINUX_BTF_BTF_PATHS ?= /sys/kernel/btf/vmlinux + +# Filter out kernels that don't exist or without a BTF section. +VMLINUX_BTF_ELF_ABSPATHS ?= $(abspath $(wildcard $(VMLINUX_BTF_ELF_PATHS))) +VMLINUX_BTF_PATHS ?= $(shell for file in $(VMLINUX_BTF_ELF_ABSPATHS); \ + do \ + if [ -f $$file ] && ($(READELF) -S "$$file" | grep -q .BTF); \ + then \ + echo "$$file"; \ + fi; \ + done) \ + $(wildcard $(VMLINUX_BTF_BTF_PATHS)) + +# Select the first as the source of vmlinux.h. +VMLINUX_BTF ?= $(firstword $(VMLINUX_BTF_PATHS)) + +ifeq ($(VMLINUX_H),) + ifeq ($(VMLINUX_BTF),) + $(error Missing bpftool input for generating vmlinux.h) + endif +endif + +$(SKEL_OUT)/vmlinux.h: $(VMLINUX_BTF) $(BPFTOOL) +ifeq ($(VMLINUX_H),) + $(QUIET_GEN)$(BPFTOOL) btf dump file $< format c > $@ +else + $(Q)cp "$(VMLINUX_H)" $@ +endif + +$(SKEL_TMP_OUT)/%.bpf.o: util/bpf_skel/%.bpf.c $(LIBBPF) $(SKEL_OUT)/vmlinux.h | $(SKEL_TMP_OUT) + $(QUIET_CLANG)$(CLANG) -g -O2 --target=bpf -Wall -Werror $(BPF_INCLUDE) $(TOOLS_UAPI_INCLUDE) \ -c $(filter util/bpf_skel/%.bpf.c,$^) -o $@ $(SKEL_OUT)/%.skel.h: $(SKEL_TMP_OUT)/%.bpf.o | $(BPFTOOL) |