projects/linux·blob master · refs

261 lines · 8.8 KiB

1# SPDX-License-Identifier: GPL-2.0
2# Copyright (c) 2022 Meta Platforms, Inc. and affiliates.
3include ../build/Build.include
4include ../scripts/Makefile.arch
5include ../scripts/Makefile.include
6
7all: all_targets
8
9ifneq ($(LLVM),)
10ifneq ($(filter %/,$(LLVM)),)
11LLVM_PREFIX := $(LLVM)
12else ifneq ($(filter -%,$(LLVM)),)
13LLVM_SUFFIX := $(LLVM)
14endif
15
16CLANG_TARGET_FLAGS_arm := arm-linux-gnueabi
17CLANG_TARGET_FLAGS_arm64 := aarch64-linux-gnu
18CLANG_TARGET_FLAGS_hexagon := hexagon-linux-musl
19CLANG_TARGET_FLAGS_m68k := m68k-linux-gnu
20CLANG_TARGET_FLAGS_mips := mipsel-linux-gnu
21CLANG_TARGET_FLAGS_powerpc := powerpc64le-linux-gnu
22CLANG_TARGET_FLAGS_riscv := riscv64-linux-gnu
23CLANG_TARGET_FLAGS_s390 := s390x-linux-gnu
24CLANG_TARGET_FLAGS_x86 := x86_64-linux-gnu
25CLANG_TARGET_FLAGS := $(CLANG_TARGET_FLAGS_$(ARCH))
26
27ifeq ($(CROSS_COMPILE),)
28ifeq ($(CLANG_TARGET_FLAGS),)
29$(error Specify CROSS_COMPILE or add '--target=' option to lib.mk)
30else
31CLANG_FLAGS += --target=$(CLANG_TARGET_FLAGS)
32endif # CLANG_TARGET_FLAGS
33else
34CLANG_FLAGS += --target=$(notdir $(CROSS_COMPILE:%-=%))
35endif # CROSS_COMPILE
36
37CC := $(LLVM_PREFIX)clang$(LLVM_SUFFIX) $(CLANG_FLAGS) -fintegrated-as
38else
39CC := $(CROSS_COMPILE)gcc
40endif # LLVM
41
42CURDIR := $(abspath .)
43TOOLSDIR := $(abspath ..)
44LIBDIR := $(TOOLSDIR)/lib
45BPFDIR := $(LIBDIR)/bpf
46TOOLSINCDIR := $(TOOLSDIR)/include
47BPFTOOLDIR := $(TOOLSDIR)/bpf/bpftool
48APIDIR := $(TOOLSINCDIR)/uapi
49GENDIR := $(abspath ../../include/generated)
50GENHDR := $(GENDIR)/autoconf.h
51
52ifeq ($(O),)
53OUTPUT_DIR := $(CURDIR)/build
54else
55OUTPUT_DIR := $(O)/build
56endif # O
57OBJ_DIR := $(OUTPUT_DIR)/obj
58INCLUDE_DIR := $(OUTPUT_DIR)/include
59BPFOBJ_DIR := $(OBJ_DIR)/libbpf
60SCXOBJ_DIR := $(OBJ_DIR)/sched_ext
61BINDIR := $(OUTPUT_DIR)/bin
62BPFOBJ := $(BPFOBJ_DIR)/libbpf.a
63ifneq ($(CROSS_COMPILE),)
64HOST_BUILD_DIR := $(OBJ_DIR)/host/obj
65HOST_OUTPUT_DIR := $(OBJ_DIR)/host
66HOST_INCLUDE_DIR := $(HOST_OUTPUT_DIR)/include
67else
68HOST_BUILD_DIR := $(OBJ_DIR)
69HOST_OUTPUT_DIR := $(OUTPUT_DIR)
70HOST_INCLUDE_DIR := $(INCLUDE_DIR)
71endif
72HOST_BPFOBJ := $(HOST_BUILD_DIR)/libbpf/libbpf.a
73RESOLVE_BTFIDS := $(HOST_BUILD_DIR)/resolve_btfids/resolve_btfids
74DEFAULT_BPFTOOL := $(HOST_OUTPUT_DIR)/sbin/bpftool
75
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)")
84endif
85
86BPFTOOL ?= $(DEFAULT_BPFTOOL)
87
88ifneq ($(wildcard $(GENHDR)),)
89 GENFLAGS := -DHAVE_GENHDR
90endif
91
92CFLAGS += -g -O2 -rdynamic -pthread -Wall -Werror $(GENFLAGS) \
93 -I$(INCLUDE_DIR) -I$(GENDIR) -I$(LIBDIR) \
94 -I$(TOOLSINCDIR) -I$(APIDIR) -I$(CURDIR)/include
95
96# Silence some warnings when compiled with clang
97ifneq ($(LLVM),)
98CFLAGS += -Wno-unused-command-line-argument
99endif
100
101LDFLAGS += -lelf -lz -lpthread
102
103IS_LITTLE_ENDIAN = $(shell $(CC) -dM -E - </dev/null | \
104 grep 'define __BYTE_ORDER__ __ORDER_LITTLE_ENDIAN__')
105
106# Get Clang's default includes on this system, as opposed to those seen by
107# '-target bpf'. This fixes "missing" files on some architectures/distros,
108# such as asm/byteorder.h, asm/socket.h, asm/sockios.h, sys/cdefs.h etc.
109#
110# Use '-idirafter': Don't interfere with include mechanics except where the
111# build would have failed anyways.
112define get_sys_includes
113$(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)}')
116endef
117
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 -Wno-microsoft-anon-tag \
126 -fms-extensions \
127 -O2 -mcpu=v3
128
129# sort removes libbpf duplicates when not cross-building
130MAKE_DIRS := $(sort $(OBJ_DIR)/libbpf $(HOST_BUILD_DIR)/libbpf \
131 $(HOST_BUILD_DIR)/bpftool $(HOST_BUILD_DIR)/resolve_btfids \
132 $(INCLUDE_DIR) $(SCXOBJ_DIR) $(BINDIR))
133
134$(MAKE_DIRS):
135 $(call msg,MKDIR,,$@)
136 $(Q)mkdir -p $@
137
138ifneq ($(CROSS_COMPILE),)
139$(BPFOBJ): $(wildcard $(BPFDIR)/*.[ch] $(BPFDIR)/Makefile) \
140 $(APIDIR)/linux/bpf.h \
141 | $(OBJ_DIR)/libbpf
142 $(Q)$(MAKE) $(submake_extras) CROSS_COMPILE=$(CROSS_COMPILE) \
143 -C $(BPFDIR) OUTPUT=$(OBJ_DIR)/libbpf/ \
144 EXTRA_CFLAGS='-g -O0 -fPIC' \
145 LDFLAGS="$(LDFLAGS)" \
146 DESTDIR=$(OUTPUT_DIR) prefix= all install_headers
147endif
148
149$(HOST_BPFOBJ): $(wildcard $(BPFDIR)/*.[ch] $(BPFDIR)/Makefile) \
150 $(APIDIR)/linux/bpf.h \
151 | $(HOST_BUILD_DIR)/libbpf
152 $(Q)$(MAKE) $(submake_extras) -C $(BPFDIR) \
153 OUTPUT=$(HOST_BUILD_DIR)/libbpf/ \
154 ARCH= CROSS_COMPILE= CC="$(HOSTCC)" LD=$(HOSTLD) \
155 EXTRA_CFLAGS='-g -O0 -fPIC' \
156 DESTDIR=$(HOST_OUTPUT_DIR) prefix= all install_headers
157
158$(DEFAULT_BPFTOOL): $(wildcard $(BPFTOOLDIR)/*.[ch] $(BPFTOOLDIR)/Makefile) \
159 $(HOST_BPFOBJ) | $(HOST_BUILD_DIR)/bpftool
160 $(Q)$(MAKE) $(submake_extras) -C $(BPFTOOLDIR) \
161 ARCH= CROSS_COMPILE= CC="$(HOSTCC)" LD=$(HOSTLD) \
162 EXTRA_CFLAGS='-g -O0' \
163 OUTPUT=$(HOST_BUILD_DIR)/bpftool/ \
164 LIBBPF_OUTPUT=$(HOST_BUILD_DIR)/libbpf/ \
165 LIBBPF_DESTDIR=$(HOST_OUTPUT_DIR)/ \
166 prefix= DESTDIR=$(HOST_OUTPUT_DIR)/ install-bin
167
168$(INCLUDE_DIR)/vmlinux.h: $(VMLINUX_BTF) $(BPFTOOL) | $(INCLUDE_DIR)
169ifeq ($(VMLINUX_H),)
170 $(call msg,GEN,,$@)
171 $(Q)$(BPFTOOL) btf dump file $(VMLINUX_BTF) format c > $@
172else
173 $(call msg,CP,,$@)
174 $(Q)cp "$(VMLINUX_H)" $@
175endif
176
177$(SCXOBJ_DIR)/%.bpf.o: %.bpf.c $(INCLUDE_DIR)/vmlinux.h include/scx/*.h \
178 | $(BPFOBJ) $(SCXOBJ_DIR)
179 $(call msg,CLNG-BPF,,$(notdir $@))
180 $(Q)$(CLANG) $(BPF_CFLAGS) -target bpf -c $< -o $@
181
182$(INCLUDE_DIR)/%.bpf.skel.h: $(SCXOBJ_DIR)/%.bpf.o $(INCLUDE_DIR)/vmlinux.h $(BPFTOOL)
183 $(eval sched=$(notdir $@))
184 $(call msg,GEN-SKEL,,$(sched))
185 $(Q)$(BPFTOOL) gen object $(<:.o=.linked1.o) $<
186 $(Q)$(BPFTOOL) gen object $(<:.o=.linked2.o) $(<:.o=.linked1.o)
187 $(Q)$(BPFTOOL) gen object $(<:.o=.linked3.o) $(<:.o=.linked2.o)
188 $(Q)diff $(<:.o=.linked2.o) $(<:.o=.linked3.o)
189 $(Q)$(BPFTOOL) gen skeleton $(<:.o=.linked3.o) name $(subst .bpf.skel.h,,$(sched)) > $@
190 $(Q)$(BPFTOOL) gen subskeleton $(<:.o=.linked3.o) name $(subst .bpf.skel.h,,$(sched)) > $(@:.skel.h=.subskel.h)
191
192SCX_COMMON_DEPS := include/scx/common.h include/scx/user_exit_info.h | $(BINDIR)
193
194c-sched-targets = scx_simple scx_cpu0 scx_qmap scx_central scx_flatcg scx_userland scx_pair scx_sdt
195
196$(addprefix $(BINDIR)/,$(c-sched-targets)): \
197 $(BINDIR)/%: \
198 $(filter-out %.bpf.c,%.c) \
199 $(INCLUDE_DIR)/%.bpf.skel.h \
200 $(SCX_COMMON_DEPS)
201 $(eval sched=$(notdir $@))
202 $(CC) $(CFLAGS) -c $(sched).c -o $(SCXOBJ_DIR)/$(sched).o
203 $(CC) -o $@ $(SCXOBJ_DIR)/$(sched).o $(BPFOBJ) $(LDFLAGS)
204
205$(c-sched-targets): %: $(BINDIR)/%
206
207install: all
208 $(Q)mkdir -p $(DESTDIR)/usr/local/bin/
209 $(Q)cp $(BINDIR)/* $(DESTDIR)/usr/local/bin/
210
211clean:
212 rm -rf $(OUTPUT_DIR) $(HOST_OUTPUT_DIR)
213 rm -f *.o *.bpf.o *.bpf.skel.h *.bpf.subskel.h
214 rm -f $(c-sched-targets)
215
216help:
217 @echo 'Building targets'
218 @echo '================'
219 @echo ''
220 @echo ' all - Compile all schedulers'
221 @echo ''
222 @echo 'Alternatively, you may compile individual schedulers:'
223 @echo ''
224 @printf ' %s\n' $(c-sched-targets)
225 @echo ''
226 @echo 'For any scheduler build target, you may specify an alternative'
227 @echo 'build output path with the O= environment variable. For example:'
228 @echo ''
229 @echo ' O=/tmp/sched_ext make all'
230 @echo ''
231 @echo 'will compile all schedulers, and emit the build artifacts to'
232 @echo '/tmp/sched_ext/build.'
233 @echo ''
234 @echo ''
235 @echo 'Installing targets'
236 @echo '=================='
237 @echo ''
238 @echo ' install - Compile and install all schedulers to /usr/bin.'
239 @echo ' You may specify the DESTDIR= environment variable'
240 @echo ' to indicate a prefix for /usr/bin. For example:'
241 @echo ''
242 @echo ' DESTDIR=/tmp/sched_ext make install'
243 @echo ''
244 @echo ' will build the schedulers in CWD/build, and'
245 @echo ' install the schedulers to /tmp/sched_ext/usr/bin.'
246 @echo ''
247 @echo ''
248 @echo 'Cleaning targets'
249 @echo '================'
250 @echo ''
251 @echo ' clean - Remove all generated files'
252
253all_targets: $(c-sched-targets)
254
255.PHONY: all all_targets $(c-sched-targets) clean help
256
257# delete failed targets
258.DELETE_ON_ERROR:
259
260# keep intermediate (.bpf.skel.h, .bpf.o, etc) targets
261.SECONDARY: