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