OSCL-LXR

0001 # SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
0002 include ../../scripts/Makefile.include
0003
0004 OUTPUT ?= $(abspath .output)/
0005
0006 BPFTOOL_OUTPUT := $(OUTPUT)bpftool/
0007 DEFAULT_BPFTOOL := $(BPFTOOL_OUTPUT)bootstrap/bpftool
0008 BPFTOOL ?= $(DEFAULT_BPFTOOL)
0009 LIBBPF_SRC := $(abspath ../../lib/bpf)
0010 BPFOBJ_OUTPUT := $(OUTPUT)libbpf/
0011 BPFOBJ := $(BPFOBJ_OUTPUT)libbpf.a
0012 BPF_DESTDIR := $(BPFOBJ_OUTPUT)
0013 BPF_INCLUDE := $(BPF_DESTDIR)/include
0014 INCLUDES := -I$(OUTPUT) -I$(BPF_INCLUDE) -I$(abspath ../../include/uapi)
0015 CFLAGS := -g -Wall $(CLANG_CROSS_FLAGS)
0016
0017 # Try to detect best kernel BTF source
0018 KERNEL_REL := $(shell uname -r)
0019 VMLINUX_BTF_PATHS := $(if $(O),$(O)/vmlinux)            \
0020         $(if $(KBUILD_OUTPUT),$(KBUILD_OUTPUT)/vmlinux) \
0021         ../../../vmlinux /sys/kernel/btf/vmlinux        \
0022         /boot/vmlinux-$(KERNEL_REL)
0023 VMLINUX_BTF_PATH := $(or $(VMLINUX_BTF),$(firstword                            \
0024                                           $(wildcard $(VMLINUX_BTF_PATHS))))
0025
0026 ifeq ($(V),1)
0027 Q =
0028 else
0029 Q = @
0030 MAKEFLAGS += --no-print-directory
0031 submake_extras := feature_display=0
0032 endif
0033
0034 .DELETE_ON_ERROR:
0035
0036 .PHONY: all clean runqslower libbpf_hdrs
0037 all: runqslower
0038
0039 runqslower: $(OUTPUT)/runqslower
0040
0041 clean:
0042         $(call QUIET_CLEAN, runqslower)
0043         $(Q)$(RM) -r $(BPFOBJ_OUTPUT) $(BPFTOOL_OUTPUT)
0044         $(Q)$(RM) $(OUTPUT)*.o $(OUTPUT)*.d
0045         $(Q)$(RM) $(OUTPUT)*.skel.h $(OUTPUT)vmlinux.h
0046         $(Q)$(RM) $(OUTPUT)runqslower
0047         $(Q)$(RM) -r .output
0048
0049 libbpf_hdrs: $(BPFOBJ)
0050
0051 $(OUTPUT)/runqslower: $(OUTPUT)/runqslower.o $(BPFOBJ)
0052         $(QUIET_LINK)$(CC) $(CFLAGS) $^ -lelf -lz -o $@
0053
0054 $(OUTPUT)/runqslower.o: runqslower.h $(OUTPUT)/runqslower.skel.h              \
0055                         $(OUTPUT)/runqslower.bpf.o | libbpf_hdrs
0056
0057 $(OUTPUT)/runqslower.bpf.o: $(OUTPUT)/vmlinux.h runqslower.h | libbpf_hdrs
0058
0059 $(OUTPUT)/%.skel.h: $(OUTPUT)/%.bpf.o | $(BPFTOOL)
0060         $(QUIET_GEN)$(BPFTOOL) gen skeleton $< > $@
0061
0062 $(OUTPUT)/%.bpf.o: %.bpf.c $(BPFOBJ) | $(OUTPUT)
0063         $(QUIET_GEN)$(CLANG) -g -O2 -target bpf $(INCLUDES)                   \
0064                  -c $(filter %.c,$^) -o $@ &&                                 \
0065         $(LLVM_STRIP) -g $@
0066
0067 $(OUTPUT)/%.o: %.c | $(OUTPUT)
0068         $(QUIET_CC)$(CC) $(CFLAGS) $(INCLUDES) -c $(filter %.c,$^) -o $@
0069
0070 $(OUTPUT) $(BPFOBJ_OUTPUT) $(BPFTOOL_OUTPUT):
0071         $(QUIET_MKDIR)mkdir -p $@
0072
0073 $(OUTPUT)/vmlinux.h: $(VMLINUX_BTF_PATH) | $(OUTPUT) $(BPFTOOL)
0074 ifeq ($(VMLINUX_H),)
0075         $(Q)if [ ! -e "$(VMLINUX_BTF_PATH)" ] ; then \
0076                 echo "Couldn't find kernel BTF; set VMLINUX_BTF to"            \
0077                         "specify its location." >&2;                           \
0078                 exit 1;\
0079         fi
0080         $(QUIET_GEN)$(BPFTOOL) btf dump file $(VMLINUX_BTF_PATH) format c > $@
0081 else
0082         $(Q)cp "$(VMLINUX_H)" $@
0083 endif
0084
0085 $(BPFOBJ): $(wildcard $(LIBBPF_SRC)/*.[ch] $(LIBBPF_SRC)/Makefile) | $(BPFOBJ_OUTPUT)
0086         $(Q)$(MAKE) $(submake_extras) -C $(LIBBPF_SRC) OUTPUT=$(BPFOBJ_OUTPUT) \
0087                     DESTDIR=$(BPFOBJ_OUTPUT) prefix= $(abspath $@) install_headers
0088
0089 $(DEFAULT_BPFTOOL): | $(BPFTOOL_OUTPUT)
0090         $(Q)$(MAKE) $(submake_extras) -C ../bpftool OUTPUT=$(BPFTOOL_OUTPUT) bootstrap