# SPDX-License-Identifier: GPL-2.0# Copyright (c) 2022 Meta Platforms, Inc. and affiliates.include ../build/Build.includeinclude ../scripts/Makefile.archinclude ../scripts/Makefile.include all: all_targets ifneq ($(LLVM),)ifneq ($(filter %/,$(LLVM)),)LLVM_PREFIX := $(LLVM)else ifneq ($(filter -%,$(LLVM)),)LLVM_SUFFIX := $(LLVM)endif CLANG_TARGET_FLAGS_arm          := arm-linux-gnueabiCLANG_TARGET_FLAGS_arm64        := aarch64-linux-gnuCLANG_TARGET_FLAGS_hexagon      := hexagon-linux-muslCLANG_TARGET_FLAGS_m68k         := m68k-linux-gnuCLANG_TARGET_FLAGS_mips         := mipsel-linux-gnuCLANG_TARGET_FLAGS_powerpc      := powerpc64le-linux-gnuCLANG_TARGET_FLAGS_riscv        := riscv64-linux-gnuCLANG_TARGET_FLAGS_s390         := s390x-linux-gnuCLANG_TARGET_FLAGS_x86          := x86_64-linux-gnuCLANG_TARGET_FLAGS              := $(CLANG_TARGET_FLAGS_$(ARCH)) ifeq ($(CROSS_COMPILE),)ifeq ($(CLANG_TARGET_FLAGS),)$(error Specify CROSS_COMPILE or add '--target=' option to lib.mk)elseCLANG_FLAGS     += --target=$(CLANG_TARGET_FLAGS)endif # CLANG_TARGET_FLAGSelseCLANG_FLAGS     += --target=$(notdir $(CROSS_COMPILE:%-=%))endif # CROSS_COMPILE CC := $(LLVM_PREFIX)clang$(LLVM_SUFFIX) $(CLANG_FLAGS) -fintegrated-aselseCC := $(CROSS_COMPILE)gccendif # LLVM CURDIR := $(abspath .)TOOLSDIR := $(abspath ..)LIBDIR := $(TOOLSDIR)/libBPFDIR := $(LIBDIR)/bpfTOOLSINCDIR := $(TOOLSDIR)/includeBPFTOOLDIR := $(TOOLSDIR)/bpf/bpftoolAPIDIR := $(TOOLSINCDIR)/uapiGENDIR := $(abspath ../../include/generated)GENHDR := $(GENDIR)/autoconf.h ifeq ($(O),)OUTPUT_DIR := $(CURDIR)/buildelseOUTPUT_DIR := $(O)/buildendif # OOBJ_DIR := $(OUTPUT_DIR)/objINCLUDE_DIR := $(OUTPUT_DIR)/includeBPFOBJ_DIR := $(OBJ_DIR)/libbpfSCXOBJ_DIR := $(OBJ_DIR)/sched_extBINDIR := $(OUTPUT_DIR)/binBPFOBJ := $(BPFOBJ_DIR)/libbpf.aifneq ($(CROSS_COMPILE),)HOST_BUILD_DIR		:= $(OBJ_DIR)/host/objHOST_OUTPUT_DIR	:= $(OBJ_DIR)/hostHOST_INCLUDE_DIR	:= $(HOST_OUTPUT_DIR)/includeelseHOST_BUILD_DIR		:= $(OBJ_DIR)HOST_OUTPUT_DIR	:= $(OUTPUT_DIR)HOST_INCLUDE_DIR	:= $(INCLUDE_DIR)endifHOST_BPFOBJ := $(HOST_BUILD_DIR)/libbpf/libbpf.aRESOLVE_BTFIDS := $(HOST_BUILD_DIR)/resolve_btfids/resolve_btfidsDEFAULT_BPFTOOL := $(HOST_OUTPUT_DIR)/sbin/bpftool VMLINUX_BTF_PATHS ?= $(if $(O),$(O)/vmlinux)					\		     $(if $(KBUILD_OUTPUT),$(KBUILD_OUTPUT)/vmlinux)		\		     ../../vmlinux						\		     /sys/kernel/btf/vmlinux					\		     /boot/vmlinux-$(shell uname -r)VMLINUX_BTF ?= $(abspath $(firstword $(wildcard $(VMLINUX_BTF_PATHS))))ifeq ($(VMLINUX_BTF),)$(error Cannot find a vmlinux for VMLINUX_BTF at any of "$(VMLINUX_BTF_PATHS)")endif BPFTOOL ?= $(DEFAULT_BPFTOOL) ifneq ($(wildcard $(GENHDR)),)  GENFLAGS := -DHAVE_GENHDRendif CFLAGS += -g -O2 -rdynamic -pthread -Wall -Werror $(GENFLAGS)			\	  -I$(INCLUDE_DIR) -I$(GENDIR) -I$(LIBDIR)				\	  -I$(TOOLSINCDIR) -I$(APIDIR) -I$(CURDIR)/include # Silence some warnings when compiled with clangifneq ($(LLVM),)CFLAGS += -Wno-unused-command-line-argumentendif LDFLAGS += -lelf -lz -lpthread IS_LITTLE_ENDIAN = $(shell $(CC) -dM -E - </dev/null |				\			grep 'define __BYTE_ORDER__ __ORDER_LITTLE_ENDIAN__') # Get Clang's default includes on this system, as opposed to those seen by# '-target bpf'. This fixes "missing" files on some architectures/distros,# such as asm/byteorder.h, asm/socket.h, asm/sockios.h, sys/cdefs.h etc.## Use '-idirafter': Don't interfere with include mechanics except where the# build would have failed anyways.define get_sys_includes$(shell $(1) -v -E - </dev/null 2>&1 \	| sed -n '/<...> search starts here:/,/End of search list./{ s| \(/.*\)|-idirafter \1|p }') \$(shell $(1) -dM -E - </dev/null | grep '__riscv_xlen ' | awk '{printf("-D__riscv_xlen=%d -D__BITS_PER_LONG=%d", $$3, $$3)}')endef BPF_CFLAGS = -g -D__TARGET_ARCH_$(SRCARCH)					\	     $(if $(IS_LITTLE_ENDIAN),-mlittle-endian,-mbig-endian)		\	     -I$(CURDIR)/include -I$(CURDIR)/include/bpf-compat			\	     -I$(INCLUDE_DIR) -I$(APIDIR)					\	     -I../../include							\	     $(call get_sys_includes,$(CLANG))					\	     -Wall -Wno-compare-distinct-pointer-types				\	     -Wno-microsoft-anon-tag						\	     -fms-extensions							\	     -O2 -mcpu=v3 # sort removes libbpf duplicates when not cross-buildingMAKE_DIRS := $(sort $(OBJ_DIR)/libbpf $(HOST_BUILD_DIR)/libbpf			\	       $(HOST_BUILD_DIR)/bpftool $(HOST_BUILD_DIR)/resolve_btfids	\	       $(INCLUDE_DIR) $(SCXOBJ_DIR) $(BINDIR)) $(MAKE_DIRS):	$(call msg,MKDIR,,$@)	$(Q)mkdir -p $@ ifneq ($(CROSS_COMPILE),)$(BPFOBJ): $(wildcard $(BPFDIR)/*.[ch] $(BPFDIR)/Makefile)			\	   $(APIDIR)/linux/bpf.h						\	   | $(OBJ_DIR)/libbpf	$(Q)$(MAKE) $(submake_extras) CROSS_COMPILE=$(CROSS_COMPILE) 		\		    -C $(BPFDIR) OUTPUT=$(OBJ_DIR)/libbpf/			\		    EXTRA_CFLAGS='-g -O0 -fPIC'					\		    LDFLAGS="$(LDFLAGS)"					\		    DESTDIR=$(OUTPUT_DIR) prefix= all install_headersendif $(HOST_BPFOBJ): $(wildcard $(BPFDIR)/*.[ch] $(BPFDIR)/Makefile)		\	   $(APIDIR)/linux/bpf.h						\	   | $(HOST_BUILD_DIR)/libbpf	$(Q)$(MAKE) $(submake_extras) -C $(BPFDIR) 				\		    OUTPUT=$(HOST_BUILD_DIR)/libbpf/				\		    ARCH= CROSS_COMPILE= CC="$(HOSTCC)" LD=$(HOSTLD)		\		    EXTRA_CFLAGS='-g -O0 -fPIC'					\		    DESTDIR=$(HOST_OUTPUT_DIR) prefix= all install_headers $(DEFAULT_BPFTOOL): $(wildcard $(BPFTOOLDIR)/*.[ch] $(BPFTOOLDIR)/Makefile)	\		    $(HOST_BPFOBJ) | $(HOST_BUILD_DIR)/bpftool	$(Q)$(MAKE) $(submake_extras)  -C $(BPFTOOLDIR)				\		    ARCH= CROSS_COMPILE= CC="$(HOSTCC)" LD=$(HOSTLD)		\		    EXTRA_CFLAGS='-g -O0'					\		    OUTPUT=$(HOST_BUILD_DIR)/bpftool/				\		    LIBBPF_OUTPUT=$(HOST_BUILD_DIR)/libbpf/			\		    LIBBPF_DESTDIR=$(HOST_OUTPUT_DIR)/				\		    prefix= DESTDIR=$(HOST_OUTPUT_DIR)/ install-bin $(INCLUDE_DIR)/vmlinux.h: $(VMLINUX_BTF) $(BPFTOOL) | $(INCLUDE_DIR)ifeq ($(VMLINUX_H),)	$(call msg,GEN,,$@)	$(Q)$(BPFTOOL) btf dump file $(VMLINUX_BTF) format c > $@else	$(call msg,CP,,$@)	$(Q)cp "$(VMLINUX_H)" $@endif $(SCXOBJ_DIR)/%.bpf.o: %.bpf.c $(INCLUDE_DIR)/vmlinux.h include/scx/*.h		\		       | $(BPFOBJ) $(SCXOBJ_DIR)	$(call msg,CLNG-BPF,,$(notdir $@))	$(Q)$(CLANG) $(BPF_CFLAGS) -target bpf -c $< -o $@ $(INCLUDE_DIR)/%.bpf.skel.h: $(SCXOBJ_DIR)/%.bpf.o $(INCLUDE_DIR)/vmlinux.h $(BPFTOOL)	$(eval sched=$(notdir $@))	$(call msg,GEN-SKEL,,$(sched))	$(Q)$(BPFTOOL) gen object $(<:.o=.linked1.o) $<	$(Q)$(BPFTOOL) gen object $(<:.o=.linked2.o) $(<:.o=.linked1.o)	$(Q)$(BPFTOOL) gen object $(<:.o=.linked3.o) $(<:.o=.linked2.o)	$(Q)diff $(<:.o=.linked2.o) $(<:.o=.linked3.o)	$(Q)$(BPFTOOL) gen skeleton $(<:.o=.linked3.o) name $(subst .bpf.skel.h,,$(sched)) > $@	$(Q)$(BPFTOOL) gen subskeleton $(<:.o=.linked3.o) name $(subst .bpf.skel.h,,$(sched)) > $(@:.skel.h=.subskel.h) SCX_COMMON_DEPS := include/scx/common.h include/scx/user_exit_info.h | $(BINDIR) c-sched-targets = scx_simple scx_cpu0 scx_qmap scx_central scx_flatcg scx_userland scx_pair scx_sdt $(addprefix $(BINDIR)/,$(c-sched-targets)): \	$(BINDIR)/%: \		$(filter-out %.bpf.c,%.c) \		$(INCLUDE_DIR)/%.bpf.skel.h \		$(SCX_COMMON_DEPS)	$(eval sched=$(notdir $@))	$(CC) $(CFLAGS) -c $(sched).c -o $(SCXOBJ_DIR)/$(sched).o	$(CC) -o $@ $(SCXOBJ_DIR)/$(sched).o $(BPFOBJ) $(LDFLAGS) $(c-sched-targets): %: $(BINDIR)/% install: all	$(Q)mkdir -p $(DESTDIR)/usr/local/bin/	$(Q)cp $(BINDIR)/* $(DESTDIR)/usr/local/bin/ clean:	rm -rf $(OUTPUT_DIR) $(HOST_OUTPUT_DIR)	rm -f *.o *.bpf.o *.bpf.skel.h *.bpf.subskel.h	rm -f $(c-sched-targets) help:	@echo   'Building targets'	@echo   '================'	@echo   ''	@echo   '  all		  - Compile all schedulers'	@echo   ''	@echo   'Alternatively, you may compile individual schedulers:'	@echo   ''	@printf '  %s\n' $(c-sched-targets)	@echo   ''	@echo   'For any scheduler build target, you may specify an alternative'	@echo   'build output path with the O= environment variable. For example:'	@echo   ''	@echo   '   O=/tmp/sched_ext make all'	@echo   ''	@echo   'will compile all schedulers, and emit the build artifacts to'	@echo   '/tmp/sched_ext/build.'	@echo   ''	@echo   ''	@echo   'Installing targets'	@echo   '=================='	@echo   ''	@echo   '  install	  - Compile and install all schedulers to /usr/bin.'	@echo   '		    You may specify the DESTDIR= environment variable'	@echo   '		    to indicate a prefix for /usr/bin. For example:'	@echo   ''	@echo   '                     DESTDIR=/tmp/sched_ext make install'	@echo   ''	@echo   '		    will build the schedulers in CWD/build, and'	@echo   '		    install the schedulers to /tmp/sched_ext/usr/bin.'	@echo   ''	@echo   ''	@echo   'Cleaning targets'	@echo   '================'	@echo   ''	@echo   '  clean		  - Remove all generated files' all_targets: $(c-sched-targets) .PHONY: all all_targets $(c-sched-targets) clean help # delete failed targets.DELETE_ON_ERROR: # keep intermediate (.bpf.skel.h, .bpf.o, etc) targets.SECONDARY: