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| 1 | +# SPDX-License-Identifier: GPL-2.0 |
| 2 | +# Copyright (c) 2022 Meta Platforms, Inc. and affiliates. |
| 3 | +include ../build/Build.include |
| 4 | +include ../scripts/Makefile.arch |
| 5 | +include ../scripts/Makefile.include |
| 6 | + |
| 7 | +all: all_targets |
| 8 | + |
| 9 | +ifneq ($(LLVM),) |
| 10 | +ifneq ($(filter %/,$(LLVM)),) |
| 11 | +LLVM_PREFIX := $(LLVM) |
| 12 | +else ifneq ($(filter -%,$(LLVM)),) |
| 13 | +LLVM_SUFFIX := $(LLVM) |
| 14 | +endif |
| 15 | + |
| 16 | +CLANG_TARGET_FLAGS_arm := arm-linux-gnueabi |
| 17 | +CLANG_TARGET_FLAGS_arm64 := aarch64-linux-gnu |
| 18 | +CLANG_TARGET_FLAGS_hexagon := hexagon-linux-musl |
| 19 | +CLANG_TARGET_FLAGS_m68k := m68k-linux-gnu |
| 20 | +CLANG_TARGET_FLAGS_mips := mipsel-linux-gnu |
| 21 | +CLANG_TARGET_FLAGS_powerpc := powerpc64le-linux-gnu |
| 22 | +CLANG_TARGET_FLAGS_riscv := riscv64-linux-gnu |
| 23 | +CLANG_TARGET_FLAGS_s390 := s390x-linux-gnu |
| 24 | +CLANG_TARGET_FLAGS_x86 := x86_64-linux-gnu |
| 25 | +CLANG_TARGET_FLAGS := $(CLANG_TARGET_FLAGS_$(ARCH)) |
| 26 | + |
| 27 | +ifeq ($(CROSS_COMPILE),) |
| 28 | +ifeq ($(CLANG_TARGET_FLAGS),) |
| 29 | +$(error Specify CROSS_COMPILE or add '--target=' option to lib.mk) |
| 30 | +else |
| 31 | +CLANG_FLAGS += --target=$(CLANG_TARGET_FLAGS) |
| 32 | +endif # CLANG_TARGET_FLAGS |
| 33 | +else |
| 34 | +CLANG_FLAGS += --target=$(notdir $(CROSS_COMPILE:%-=%)) |
| 35 | +endif # CROSS_COMPILE |
| 36 | + |
| 37 | +CC := $(LLVM_PREFIX)clang$(LLVM_SUFFIX) $(CLANG_FLAGS) -fintegrated-as |
| 38 | +else |
| 39 | +CC := $(CROSS_COMPILE)gcc |
| 40 | +endif # LLVM |
| 41 | + |
| 42 | +CURDIR := $(abspath .) |
| 43 | +TOOLSDIR := $(abspath ..) |
| 44 | +LIBDIR := $(TOOLSDIR)/lib |
| 45 | +BPFDIR := $(LIBDIR)/bpf |
| 46 | +TOOLSINCDIR := $(TOOLSDIR)/include |
| 47 | +BPFTOOLDIR := $(TOOLSDIR)/bpf/bpftool |
| 48 | +APIDIR := $(TOOLSINCDIR)/uapi |
| 49 | +GENDIR := $(abspath ../../include/generated) |
| 50 | +GENHDR := $(GENDIR)/autoconf.h |
| 51 | + |
| 52 | +ifeq ($(O),) |
| 53 | +OUTPUT_DIR := $(CURDIR)/build |
| 54 | +else |
| 55 | +OUTPUT_DIR := $(O)/build |
| 56 | +endif # O |
| 57 | +OBJ_DIR := $(OUTPUT_DIR)/obj |
| 58 | +INCLUDE_DIR := $(OUTPUT_DIR)/include |
| 59 | +BPFOBJ_DIR := $(OBJ_DIR)/libbpf |
| 60 | +SCXOBJ_DIR := $(OBJ_DIR)/sched_ext |
| 61 | +BINDIR := $(OUTPUT_DIR)/bin |
| 62 | +BPFOBJ := $(BPFOBJ_DIR)/libbpf.a |
| 63 | +ifneq ($(CROSS_COMPILE),) |
| 64 | +HOST_BUILD_DIR := $(OBJ_DIR)/host |
| 65 | +HOST_OUTPUT_DIR := host-tools |
| 66 | +HOST_INCLUDE_DIR := $(HOST_OUTPUT_DIR)/include |
| 67 | +else |
| 68 | +HOST_BUILD_DIR := $(OBJ_DIR) |
| 69 | +HOST_OUTPUT_DIR := $(OUTPUT_DIR) |
| 70 | +HOST_INCLUDE_DIR := $(INCLUDE_DIR) |
| 71 | +endif |
| 72 | +HOST_BPFOBJ := $(HOST_BUILD_DIR)/libbpf/libbpf.a |
| 73 | +RESOLVE_BTFIDS := $(HOST_BUILD_DIR)/resolve_btfids/resolve_btfids |
| 74 | +DEFAULT_BPFTOOL := $(HOST_OUTPUT_DIR)/sbin/bpftool |
| 75 | + |
| 76 | +VMLINUX_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) |
| 81 | +VMLINUX_BTF ?= $(abspath $(firstword $(wildcard $(VMLINUX_BTF_PATHS)))) |
| 82 | +ifeq ($(VMLINUX_BTF),) |
| 83 | +$(error Cannot find a vmlinux for VMLINUX_BTF at any of "$(VMLINUX_BTF_PATHS)") |
| 84 | +endif |
| 85 | + |
| 86 | +BPFTOOL ?= $(DEFAULT_BPFTOOL) |
| 87 | + |
| 88 | +ifneq ($(wildcard $(GENHDR)),) |
| 89 | + GENFLAGS := -DHAVE_GENHDR |
| 90 | +endif |
| 91 | + |
| 92 | +CFLAGS += -g -O2 -rdynamic -pthread -Wall -Werror $(GENFLAGS) \ |
| 93 | + -I$(INCLUDE_DIR) -I$(GENDIR) -I$(LIBDIR) \ |
| 94 | + -I$(TOOLSINCDIR) -I$(APIDIR) -I$(CURDIR)/include |
| 95 | + |
| 96 | +# Silence some warnings when compiled with clang |
| 97 | +ifneq ($(LLVM),) |
| 98 | +CFLAGS += -Wno-unused-command-line-argument |
| 99 | +endif |
| 100 | + |
| 101 | +LDFLAGS = -lelf -lz -lpthread |
| 102 | + |
| 103 | +IS_LITTLE_ENDIAN = $(shell $(CC) -dM -E - </dev/null | \ |
| 104 | + grep 'define __BYTE_ORDER__ __ORDER_LITTLE_ENDIAN__') |
| 105 | + |
| 106 | +# Get Clang's default includes on this system, as opposed to those seen by |
| 107 | +# '-target bpf'. This fixes "missing" files on some architectures/distros, |
| 108 | +# such as asm/byteorder.h, asm/socket.h, asm/sockios.h, sys/cdefs.h etc. |
| 109 | +# |
| 110 | +# Use '-idirafter': Don't interfere with include mechanics except where the |
| 111 | +# build would have failed anyways. |
| 112 | +define get_sys_includes |
| 113 | +$(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)}') |
| 116 | +endef |
| 117 | + |
| 118 | +BPF_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=v3 |
| 126 | + |
| 127 | +# sort removes libbpf duplicates when not cross-building |
| 128 | +MAKE_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)/libbpf |
| 139 | + $(Q)$(MAKE) $(submake_extras) -C $(BPFDIR) OUTPUT=$(OBJ_DIR)/libbpf/ \ |
| 140 | + EXTRA_CFLAGS='-g -O0 -fPIC' \ |
| 141 | + DESTDIR=$(OUTPUT_DIR) prefix= all install_headers |
| 142 | + |
| 143 | +$(DEFAULT_BPFTOOL): $(wildcard $(BPFTOOLDIR)/*.[ch] $(BPFTOOLDIR)/Makefile) \ |
| 144 | + $(HOST_BPFOBJ) | $(HOST_BUILD_DIR)/bpftool |
| 145 | + $(Q)$(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=$(HOST_OUTPUT_DIR)/ install-bin |
| 152 | + |
| 153 | +$(INCLUDE_DIR)/vmlinux.h: $(VMLINUX_BTF) $(BPFTOOL) | $(INCLUDE_DIR) |
| 154 | +ifeq ($(VMLINUX_H),) |
| 155 | + $(call msg,GEN,,$@) |
| 156 | + $(Q)$(BPFTOOL) btf dump file $(VMLINUX_BTF) format c > $@ |
| 157 | +else |
| 158 | + $(call msg,CP,,$@) |
| 159 | + $(Q)cp "$(VMLINUX_H)" $@ |
| 160 | +endif |
| 161 | + |
| 162 | +$(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 | + |
| 177 | +SCX_COMMON_DEPS := include/scx/common.h include/scx/user_exit_info.h | $(BINDIR) |
| 178 | + |
| 179 | +c-sched-targets = scx_simple scx_qmap |
| 180 | + |
| 181 | +$(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).o |
| 188 | + $(CC) -o $@ $(SCXOBJ_DIR)/$(sched).o $(HOST_BPFOBJ) $(LDFLAGS) |
| 189 | + |
| 190 | +$(c-sched-targets): %: $(BINDIR)/% |
| 191 | + |
| 192 | +install: all |
| 193 | + $(Q)mkdir -p $(DESTDIR)/usr/local/bin/ |
| 194 | + $(Q)cp $(BINDIR)/* $(DESTDIR)/usr/local/bin/ |
| 195 | + |
| 196 | +clean: |
| 197 | + rm -rf $(OUTPUT_DIR) $(HOST_OUTPUT_DIR) |
| 198 | + rm -f *.o *.bpf.o *.bpf.skel.h *.bpf.subskel.h |
| 199 | + rm -f $(c-sched-targets) |
| 200 | + |
| 201 | +help: |
| 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 | + |
| 238 | +all_targets: $(c-sched-targets) |
| 239 | + |
| 240 | +.PHONY: all all_targets $(c-sched-targets) clean help |
| 241 | + |
| 242 | +# delete failed targets |
| 243 | +.DELETE_ON_ERROR: |
| 244 | + |
| 245 | +# keep intermediate (.bpf.skel.h, .bpf.o, etc) targets |
| 246 | +.SECONDARY: |
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