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1# SPDX-License-Identifier: GPL-2.02# Copyright (c) 2022 Meta Platforms, Inc. and affiliates.3include ../build/Build.include4include ../scripts/Makefile.arch5include ../scripts/Makefile.include6 7all: all_targets8 9ifneq ($(LLVM),)10ifneq ($(filter %/,$(LLVM)),)11LLVM_PREFIX := $(LLVM)12else ifneq ($(filter -%,$(LLVM)),)13LLVM_SUFFIX := $(LLVM)14endif15 16CLANG_TARGET_FLAGS_arm := arm-linux-gnueabi17CLANG_TARGET_FLAGS_arm64 := aarch64-linux-gnu18CLANG_TARGET_FLAGS_hexagon := hexagon-linux-musl19CLANG_TARGET_FLAGS_m68k := m68k-linux-gnu20CLANG_TARGET_FLAGS_mips := mipsel-linux-gnu21CLANG_TARGET_FLAGS_powerpc := powerpc64le-linux-gnu22CLANG_TARGET_FLAGS_riscv := riscv64-linux-gnu23CLANG_TARGET_FLAGS_s390 := s390x-linux-gnu24CLANG_TARGET_FLAGS_x86 := x86_64-linux-gnu25CLANG_TARGET_FLAGS := $(CLANG_TARGET_FLAGS_$(ARCH))26 27ifeq ($(CROSS_COMPILE),)28ifeq ($(CLANG_TARGET_FLAGS),)29$(error Specify CROSS_COMPILE or add '--target=' option to lib.mk)30else31CLANG_FLAGS += --target=$(CLANG_TARGET_FLAGS)32endif # CLANG_TARGET_FLAGS33else34CLANG_FLAGS += --target=$(notdir $(CROSS_COMPILE:%-=%))35endif # CROSS_COMPILE36 37CC := $(LLVM_PREFIX)clang$(LLVM_SUFFIX) $(CLANG_FLAGS) -fintegrated-as38else39CC := $(CROSS_COMPILE)gcc40endif # LLVM41 42CURDIR := $(abspath .)43TOOLSDIR := $(abspath ..)44LIBDIR := $(TOOLSDIR)/lib45BPFDIR := $(LIBDIR)/bpf46TOOLSINCDIR := $(TOOLSDIR)/include47BPFTOOLDIR := $(TOOLSDIR)/bpf/bpftool48APIDIR := $(TOOLSINCDIR)/uapi49GENDIR := $(abspath ../../include/generated)50GENHDR := $(GENDIR)/autoconf.h51 52ifeq ($(O),)53OUTPUT_DIR := $(CURDIR)/build54else55OUTPUT_DIR := $(O)/build56endif # O57OBJ_DIR := $(OUTPUT_DIR)/obj58INCLUDE_DIR := $(OUTPUT_DIR)/include59BPFOBJ_DIR := $(OBJ_DIR)/libbpf60SCXOBJ_DIR := $(OBJ_DIR)/sched_ext61BINDIR := $(OUTPUT_DIR)/bin62BPFOBJ := $(BPFOBJ_DIR)/libbpf.a63ifneq ($(CROSS_COMPILE),)64HOST_BUILD_DIR := $(OBJ_DIR)/host65HOST_OUTPUT_DIR := host-tools66HOST_INCLUDE_DIR := $(HOST_OUTPUT_DIR)/include67else68HOST_BUILD_DIR := $(OBJ_DIR)69HOST_OUTPUT_DIR := $(OUTPUT_DIR)70HOST_INCLUDE_DIR := $(INCLUDE_DIR)71endif72HOST_BPFOBJ := $(HOST_BUILD_DIR)/libbpf/libbpf.a73RESOLVE_BTFIDS := $(HOST_BUILD_DIR)/resolve_btfids/resolve_btfids74DEFAULT_BPFTOOL := $(HOST_OUTPUT_DIR)/sbin/bpftool75 76VMLINUX_BTF_PATHS ?= $(if $(O),$(O)/vmlinux) \77 $(if $(KBUILD_OUTPUT),$(KBUILD_OUTPUT)/vmlinux) \78 ../../vmlinux \79 /sys/kernel/btf/vmlinux \80 /boot/vmlinux-$(shell uname -r)81VMLINUX_BTF ?= $(abspath $(firstword $(wildcard $(VMLINUX_BTF_PATHS))))82ifeq ($(VMLINUX_BTF),)83$(error Cannot find a vmlinux for VMLINUX_BTF at any of "$(VMLINUX_BTF_PATHS)")84endif85 86BPFTOOL ?= $(DEFAULT_BPFTOOL)87 88ifneq ($(wildcard $(GENHDR)),)89 GENFLAGS := -DHAVE_GENHDR90endif91 92CFLAGS += -g -O2 -rdynamic -pthread -Wall -Werror $(GENFLAGS) \93 -I$(INCLUDE_DIR) -I$(GENDIR) -I$(LIBDIR) \94 -I$(TOOLSINCDIR) -I$(APIDIR) -I$(CURDIR)/include95 96# Silence some warnings when compiled with clang97ifneq ($(LLVM),)98CFLAGS += -Wno-unused-command-line-argument99endif100 101LDFLAGS = -lelf -lz -lpthread102 103IS_LITTLE_ENDIAN = $(shell $(CC) -dM -E - </dev/null | \104 grep 'define __BYTE_ORDER__ __ORDER_LITTLE_ENDIAN__')105 106# Get Clang's default includes on this system, as opposed to those seen by107# '-target bpf'. This fixes "missing" files on some architectures/distros,108# such as asm/byteorder.h, asm/socket.h, asm/sockios.h, sys/cdefs.h etc.109#110# Use '-idirafter': Don't interfere with include mechanics except where the111# build would have failed anyways.112define get_sys_includes113$(shell $(1) -v -E - </dev/null 2>&1 \114 | sed -n '/<...> search starts here:/,/End of search list./{ s| \(/.*\)|-idirafter \1|p }') \115$(shell $(1) -dM -E - </dev/null | grep '__riscv_xlen ' | awk '{printf("-D__riscv_xlen=%d -D__BITS_PER_LONG=%d", $$3, $$3)}')116endef117 118BPF_CFLAGS = -g -D__TARGET_ARCH_$(SRCARCH) \119 $(if $(IS_LITTLE_ENDIAN),-mlittle-endian,-mbig-endian) \120 -I$(CURDIR)/include -I$(CURDIR)/include/bpf-compat \121 -I$(INCLUDE_DIR) -I$(APIDIR) \122 -I../../include \123 $(call get_sys_includes,$(CLANG)) \124 -Wall -Wno-compare-distinct-pointer-types \125 -O2 -mcpu=v3126 127# sort removes libbpf duplicates when not cross-building128MAKE_DIRS := $(sort $(OBJ_DIR)/libbpf $(HOST_BUILD_DIR)/libbpf \129 $(HOST_BUILD_DIR)/bpftool $(HOST_BUILD_DIR)/resolve_btfids \130 $(INCLUDE_DIR) $(SCXOBJ_DIR) $(BINDIR))131 132$(MAKE_DIRS):133 $(call msg,MKDIR,,$@)134 $(Q)mkdir -p $@135 136$(BPFOBJ): $(wildcard $(BPFDIR)/*.[ch] $(BPFDIR)/Makefile) \137 $(APIDIR)/linux/bpf.h \138 | $(OBJ_DIR)/libbpf139 $(Q)$(MAKE) $(submake_extras) -C $(BPFDIR) OUTPUT=$(OBJ_DIR)/libbpf/ \140 EXTRA_CFLAGS='-g -O0 -fPIC' \141 DESTDIR=$(OUTPUT_DIR) prefix= all install_headers142 143$(DEFAULT_BPFTOOL): $(wildcard $(BPFTOOLDIR)/*.[ch] $(BPFTOOLDIR)/Makefile) \144 $(HOST_BPFOBJ) | $(HOST_BUILD_DIR)/bpftool145 $(Q)$(MAKE) $(submake_extras) -C $(BPFTOOLDIR) \146 ARCH= CROSS_COMPILE= CC=$(HOSTCC) LD=$(HOSTLD) \147 EXTRA_CFLAGS='-g -O0' \148 OUTPUT=$(HOST_BUILD_DIR)/bpftool/ \149 LIBBPF_OUTPUT=$(HOST_BUILD_DIR)/libbpf/ \150 LIBBPF_DESTDIR=$(HOST_OUTPUT_DIR)/ \151 prefix= DESTDIR=$(HOST_OUTPUT_DIR)/ install-bin152 153$(INCLUDE_DIR)/vmlinux.h: $(VMLINUX_BTF) $(BPFTOOL) | $(INCLUDE_DIR)154ifeq ($(VMLINUX_H),)155 $(call msg,GEN,,$@)156 $(Q)$(BPFTOOL) btf dump file $(VMLINUX_BTF) format c > $@157else158 $(call msg,CP,,$@)159 $(Q)cp "$(VMLINUX_H)" $@160endif161 162$(SCXOBJ_DIR)/%.bpf.o: %.bpf.c $(INCLUDE_DIR)/vmlinux.h include/scx/*.h \163 | $(BPFOBJ) $(SCXOBJ_DIR)164 $(call msg,CLNG-BPF,,$(notdir $@))165 $(Q)$(CLANG) $(BPF_CFLAGS) -target bpf -c $< -o $@166 167$(INCLUDE_DIR)/%.bpf.skel.h: $(SCXOBJ_DIR)/%.bpf.o $(INCLUDE_DIR)/vmlinux.h $(BPFTOOL)168 $(eval sched=$(notdir $@))169 $(call msg,GEN-SKEL,,$(sched))170 $(Q)$(BPFTOOL) gen object $(<:.o=.linked1.o) $<171 $(Q)$(BPFTOOL) gen object $(<:.o=.linked2.o) $(<:.o=.linked1.o)172 $(Q)$(BPFTOOL) gen object $(<:.o=.linked3.o) $(<:.o=.linked2.o)173 $(Q)diff $(<:.o=.linked2.o) $(<:.o=.linked3.o)174 $(Q)$(BPFTOOL) gen skeleton $(<:.o=.linked3.o) name $(subst .bpf.skel.h,,$(sched)) > $@175 $(Q)$(BPFTOOL) gen subskeleton $(<:.o=.linked3.o) name $(subst .bpf.skel.h,,$(sched)) > $(@:.skel.h=.subskel.h)176 177SCX_COMMON_DEPS := include/scx/common.h include/scx/user_exit_info.h | $(BINDIR)178 179c-sched-targets = scx_simple scx_qmap scx_central scx_flatcg180 181$(addprefix $(BINDIR)/,$(c-sched-targets)): \182 $(BINDIR)/%: \183 $(filter-out %.bpf.c,%.c) \184 $(INCLUDE_DIR)/%.bpf.skel.h \185 $(SCX_COMMON_DEPS)186 $(eval sched=$(notdir $@))187 $(CC) $(CFLAGS) -c $(sched).c -o $(SCXOBJ_DIR)/$(sched).o188 $(CC) -o $@ $(SCXOBJ_DIR)/$(sched).o $(HOST_BPFOBJ) $(LDFLAGS)189 190$(c-sched-targets): %: $(BINDIR)/%191 192install: all193 $(Q)mkdir -p $(DESTDIR)/usr/local/bin/194 $(Q)cp $(BINDIR)/* $(DESTDIR)/usr/local/bin/195 196clean:197 rm -rf $(OUTPUT_DIR) $(HOST_OUTPUT_DIR)198 rm -f *.o *.bpf.o *.bpf.skel.h *.bpf.subskel.h199 rm -f $(c-sched-targets)200 201help:202 @echo 'Building targets'203 @echo '================'204 @echo ''205 @echo ' all - Compile all schedulers'206 @echo ''207 @echo 'Alternatively, you may compile individual schedulers:'208 @echo ''209 @printf ' %s\n' $(c-sched-targets)210 @echo ''211 @echo 'For any scheduler build target, you may specify an alternative'212 @echo 'build output path with the O= environment variable. For example:'213 @echo ''214 @echo ' O=/tmp/sched_ext make all'215 @echo ''216 @echo 'will compile all schedulers, and emit the build artifacts to'217 @echo '/tmp/sched_ext/build.'218 @echo ''219 @echo ''220 @echo 'Installing targets'221 @echo '=================='222 @echo ''223 @echo ' install - Compile and install all schedulers to /usr/bin.'224 @echo ' You may specify the DESTDIR= environment variable'225 @echo ' to indicate a prefix for /usr/bin. For example:'226 @echo ''227 @echo ' DESTDIR=/tmp/sched_ext make install'228 @echo ''229 @echo ' will build the schedulers in CWD/build, and'230 @echo ' install the schedulers to /tmp/sched_ext/usr/bin.'231 @echo ''232 @echo ''233 @echo 'Cleaning targets'234 @echo '================'235 @echo ''236 @echo ' clean - Remove all generated files'237 238all_targets: $(c-sched-targets)239 240.PHONY: all all_targets $(c-sched-targets) clean help241 242# delete failed targets243.DELETE_ON_ERROR:244 245# keep intermediate (.bpf.skel.h, .bpf.o, etc) targets246.SECONDARY:247