1# SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) 2include ../../scripts/Makefile.include 3 4OUTPUT ?= $(abspath .output)/ 5 6BPFTOOL_OUTPUT := $(OUTPUT)bpftool/ 7DEFAULT_BPFTOOL := $(BPFTOOL_OUTPUT)bootstrap/bpftool 8BPFTOOL ?= $(DEFAULT_BPFTOOL) 9LIBBPF_SRC := $(abspath ../../lib/bpf) 10BPFOBJ_OUTPUT := $(OUTPUT)libbpf/ 11BPFOBJ := $(BPFOBJ_OUTPUT)libbpf.a 12BPF_DESTDIR := $(BPFOBJ_OUTPUT) 13BPF_INCLUDE := $(BPF_DESTDIR)/include 14INCLUDES := -I$(OUTPUT) -I$(BPF_INCLUDE) -I$(abspath ../../include/uapi) 15CFLAGS := -g -Wall $(CLANG_CROSS_FLAGS) 16CFLAGS += $(EXTRA_CFLAGS) 17LDFLAGS += $(EXTRA_LDFLAGS) 18 19# Try to detect best kernel BTF source 20KERNEL_REL := $(shell uname -r) 21VMLINUX_BTF_PATHS := $(if $(O),$(O)/vmlinux) \ 22 $(if $(KBUILD_OUTPUT),$(KBUILD_OUTPUT)/vmlinux) \ 23 ../../../vmlinux /sys/kernel/btf/vmlinux \ 24 /boot/vmlinux-$(KERNEL_REL) 25VMLINUX_BTF_PATH := $(or $(VMLINUX_BTF),$(firstword \ 26 $(wildcard $(VMLINUX_BTF_PATHS)))) 27 28ifeq ($(V),1) 29Q = 30else 31Q = @ 32MAKEFLAGS += --no-print-directory 33submake_extras := feature_display=0 34endif 35 36.DELETE_ON_ERROR: 37 38.PHONY: all clean runqslower libbpf_hdrs 39all: runqslower 40 41runqslower: $(OUTPUT)/runqslower 42 43clean: 44 $(call QUIET_CLEAN, runqslower) 45 $(Q)$(RM) -r $(BPFOBJ_OUTPUT) $(BPFTOOL_OUTPUT) 46 $(Q)$(RM) $(OUTPUT)*.o $(OUTPUT)*.d 47 $(Q)$(RM) $(OUTPUT)*.skel.h $(OUTPUT)vmlinux.h 48 $(Q)$(RM) $(OUTPUT)runqslower 49 $(Q)$(RM) -r .output 50 51libbpf_hdrs: $(BPFOBJ) 52 53$(OUTPUT)/runqslower: $(OUTPUT)/runqslower.o $(BPFOBJ) 54 $(QUIET_LINK)$(CC) $(CFLAGS) $^ -lelf -lz -o $@ 55 56$(OUTPUT)/runqslower.o: runqslower.h $(OUTPUT)/runqslower.skel.h \ 57 $(OUTPUT)/runqslower.bpf.o | libbpf_hdrs 58 59$(OUTPUT)/runqslower.bpf.o: $(OUTPUT)/vmlinux.h runqslower.h | libbpf_hdrs 60 61$(OUTPUT)/%.skel.h: $(OUTPUT)/%.bpf.o | $(BPFTOOL) 62 $(QUIET_GEN)$(BPFTOOL) gen skeleton $< > $@ 63 64$(OUTPUT)/%.bpf.o: %.bpf.c $(BPFOBJ) | $(OUTPUT) 65 $(QUIET_GEN)$(CLANG) -g -O2 -target bpf $(INCLUDES) \ 66 -c $(filter %.c,$^) -o $@ && \ 67 $(LLVM_STRIP) -g $@ 68 69$(OUTPUT)/%.o: %.c | $(OUTPUT) 70 $(QUIET_CC)$(CC) $(CFLAGS) $(INCLUDES) -c $(filter %.c,$^) -o $@ 71 72$(OUTPUT) $(BPFOBJ_OUTPUT) $(BPFTOOL_OUTPUT): 73 $(QUIET_MKDIR)mkdir -p $@ 74 75$(OUTPUT)/vmlinux.h: $(VMLINUX_BTF_PATH) | $(OUTPUT) $(BPFTOOL) 76ifeq ($(VMLINUX_H),) 77 $(Q)if [ ! -e "$(VMLINUX_BTF_PATH)" ] ; then \ 78 echo "Couldn't find kernel BTF; set VMLINUX_BTF to" \ 79 "specify its location." >&2; \ 80 exit 1;\ 81 fi 82 $(QUIET_GEN)$(BPFTOOL) btf dump file $(VMLINUX_BTF_PATH) format c > $@ 83else 84 $(Q)cp "$(VMLINUX_H)" $@ 85endif 86 87$(BPFOBJ): $(wildcard $(LIBBPF_SRC)/*.[ch] $(LIBBPF_SRC)/Makefile) | $(BPFOBJ_OUTPUT) 88 $(Q)$(MAKE) $(submake_extras) -C $(LIBBPF_SRC) OUTPUT=$(BPFOBJ_OUTPUT) \ 89 DESTDIR=$(BPFOBJ_OUTPUT) prefix= $(abspath $@) install_headers 90 91$(DEFAULT_BPFTOOL): | $(BPFTOOL_OUTPUT) 92 $(Q)$(MAKE) $(submake_extras) -C ../bpftool OUTPUT=$(BPFTOOL_OUTPUT) bootstrap 93