# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2022 Meta Platforms, Inc. and affiliates.
include ../build/Build.include
include ../scripts/Makefile.arch
include ../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-gnueabi
CLANG_TARGET_FLAGS_arm64 := aarch64-linux-gnu
CLANG_TARGET_FLAGS_hexagon := hexagon-linux-musl
CLANG_TARGET_FLAGS_m68k := m68k-linux-gnu
CLANG_TARGET_FLAGS_mips := mipsel-linux-gnu
CLANG_TARGET_FLAGS_powerpc := powerpc64le-linux-gnu
CLANG_TARGET_FLAGS_riscv := riscv64-linux-gnu
CLANG_TARGET_FLAGS_s390 := s390x-linux-gnu
CLANG_TARGET_FLAGS_x86 := x86_64-linux-gnu
CLANG_TARGET_FLAGS := $(CLANG_TARGET_FLAGS_$(ARCH))
ifeq ($(CROSS_COMPILE),)
ifeq ($(CLANG_TARGET_FLAGS),)
$(error Specify CROSS_COMPILE or add '--target=' option to lib.mk)
else
CLANG_FLAGS += --target=$(CLANG_TARGET_FLAGS)
endif # CLANG_TARGET_FLAGS
else
CLANG_FLAGS += --target=$(notdir $(CROSS_COMPILE:%-=%))
endif # CROSS_COMPILE
CC := $(LLVM_PREFIX)clang$(LLVM_SUFFIX) $(CLANG_FLAGS) -fintegrated-as
else
CC := $(CROSS_COMPILE)gcc
endif # LLVM
CURDIR := $(abspath .)
TOOLSDIR := $(abspath ..)
LIBDIR := $(TOOLSDIR)/lib
BPFDIR := $(LIBDIR)/bpf
TOOLSINCDIR := $(TOOLSDIR)/include
BPFTOOLDIR := $(TOOLSDIR)/bpf/bpftool
APIDIR := $(TOOLSINCDIR)/uapi
GENDIR := $(abspath ../../include/generated)
GENHDR := $(GENDIR)/autoconf.h
ifeq ($(O),)
OUTPUT_DIR := $(CURDIR)/build
else
OUTPUT_DIR := $(O)/build
endif # O
OBJ_DIR := $(OUTPUT_DIR)/obj
INCLUDE_DIR := $(OUTPUT_DIR)/include
BPFOBJ_DIR := $(OBJ_DIR)/libbpf
SCXOBJ_DIR := $(OBJ_DIR)/sched_ext
BINDIR := $(OUTPUT_DIR)/bin
BPFOBJ := $(BPFOBJ_DIR)/libbpf.a
ifneq ($(CROSS_COMPILE),)
HOST_BUILD_DIR := $(OBJ_DIR)/host
HOST_OUTPUT_DIR := host-tools
HOST_INCLUDE_DIR := $(HOST_OUTPUT_DIR)/include
else
HOST_BUILD_DIR := $(OBJ_DIR)
HOST_OUTPUT_DIR := $(OUTPUT_DIR)
HOST_INCLUDE_DIR := $(INCLUDE_DIR)
endif
HOST_BPFOBJ := $(HOST_BUILD_DIR)/libbpf/libbpf.a
RESOLVE_BTFIDS := $(HOST_BUILD_DIR)/resolve_btfids/resolve_btfids
DEFAULT_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_GENHDR
endif
CFLAGS += -g -O2 -rdynamic -pthread -Wall -Werror $(GENFLAGS) \
-I$(INCLUDE_DIR) -I$(GENDIR) -I$(LIBDIR) \
-I$(TOOLSINCDIR) -I$(APIDIR) -I$(CURDIR)/include
# Silence some warnings when compiled with clang
ifneq ($(LLVM),)
CFLAGS += -Wno-unused-command-line-argument
endif
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 \
-O2 -mcpu=v3
# sort removes libbpf duplicates when not cross-building
MAKE_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 $@
$(BPFOBJ): $(wildcard $(BPFDIR)/*.[ch] $(BPFDIR)/Makefile) \
$(APIDIR)/linux/bpf.h \
| $(OBJ_DIR)/libbpf
$(Q)$(MAKE) $(submake_extras) -C $(BPFDIR) OUTPUT=$(OBJ_DIR)/libbpf/ \
EXTRA_CFLAGS='-g -O0 -fPIC' \
DESTDIR=$(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_qmap scx_central scx_flatcg
$(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 $(HOST_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:
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