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