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
  7TEST_GEN_PROGS := runner
  8
  9# override lib.mk's default rules
 10OVERRIDE_TARGETS := 1
 11include ../lib.mk
 12
 13CURDIR := $(abspath .)
 14REPOROOT := $(abspath ../../../..)
 15TOOLSDIR := $(REPOROOT)/tools
 16LIBDIR := $(TOOLSDIR)/lib
 17BPFDIR := $(LIBDIR)/bpf
 18TOOLSINCDIR := $(TOOLSDIR)/include
 19BPFTOOLDIR := $(TOOLSDIR)/bpf/bpftool
 20APIDIR := $(TOOLSINCDIR)/uapi
 21GENDIR := $(REPOROOT)/include/generated
 22GENHDR := $(GENDIR)/autoconf.h
 23SCXTOOLSDIR := $(TOOLSDIR)/sched_ext
 24SCXTOOLSINCDIR := $(TOOLSDIR)/sched_ext/include
 25
 26OUTPUT_DIR := $(OUTPUT)/build
 27OBJ_DIR := $(OUTPUT_DIR)/obj
 28INCLUDE_DIR := $(OUTPUT_DIR)/include
 29BPFOBJ_DIR := $(OBJ_DIR)/libbpf
 30SCXOBJ_DIR := $(OBJ_DIR)/sched_ext
 31BPFOBJ := $(BPFOBJ_DIR)/libbpf.a
 32LIBBPF_OUTPUT := $(OBJ_DIR)/libbpf/libbpf.a
 33
 34DEFAULT_BPFTOOL := $(OUTPUT_DIR)/host/sbin/bpftool
 35HOST_OBJ_DIR := $(OBJ_DIR)/host/bpftool
 36HOST_LIBBPF_OUTPUT := $(OBJ_DIR)/host/libbpf/
 37HOST_LIBBPF_DESTDIR := $(OUTPUT_DIR)/host/
 38HOST_DESTDIR := $(OUTPUT_DIR)/host/
 39
 40VMLINUX_BTF_PATHS ?= $(if $(O),$(O)/vmlinux)					\
 41		     $(if $(KBUILD_OUTPUT),$(KBUILD_OUTPUT)/vmlinux)		\
 42		     ../../../../vmlinux					\
 43		     /sys/kernel/btf/vmlinux					\
 44		     /boot/vmlinux-$(shell uname -r)
 45VMLINUX_BTF ?= $(abspath $(firstword $(wildcard $(VMLINUX_BTF_PATHS))))
 46ifeq ($(VMLINUX_BTF),)
 47$(error Cannot find a vmlinux for VMLINUX_BTF at any of "$(VMLINUX_BTF_PATHS)")
 48endif
 49
 50BPFTOOL ?= $(DEFAULT_BPFTOOL)
 51
 52ifneq ($(wildcard $(GENHDR)),)
 53  GENFLAGS := -DHAVE_GENHDR
 54endif
 55
 56CFLAGS += -g -O2 -rdynamic -pthread -Wall -Werror $(GENFLAGS)			\
 57	  -I$(INCLUDE_DIR) -I$(GENDIR) -I$(LIBDIR)				\
 58	  -I$(TOOLSINCDIR) -I$(APIDIR) -I$(CURDIR)/include -I$(SCXTOOLSINCDIR)
 59
 60# Silence some warnings when compiled with clang
 61ifneq ($(LLVM),)
 62CFLAGS += -Wno-unused-command-line-argument
 63endif
 64
 65LDFLAGS = -lelf -lz -lpthread -lzstd
 66
 67IS_LITTLE_ENDIAN = $(shell $(CC) -dM -E - </dev/null |				\
 68			grep 'define __BYTE_ORDER__ __ORDER_LITTLE_ENDIAN__')
 69
 70# Get Clang's default includes on this system, as opposed to those seen by
 71# '-target bpf'. This fixes "missing" files on some architectures/distros,
 72# such as asm/byteorder.h, asm/socket.h, asm/sockios.h, sys/cdefs.h etc.
 73#
 74# Use '-idirafter': Don't interfere with include mechanics except where the
 75# build would have failed anyways.
 76define get_sys_includes
 77$(shell $(1) $(2) -v -E - </dev/null 2>&1 \
 78	| sed -n '/<...> search starts here:/,/End of search list./{ s| \(/.*\)|-idirafter \1|p }') \
 79$(shell $(1) $(2) -dM -E - </dev/null | grep '__riscv_xlen ' | awk '{printf("-D__riscv_xlen=%d -D__BITS_PER_LONG=%d", $$3, $$3)}')
 80endef
 81
 82ifneq ($(CROSS_COMPILE),)
 83CLANG_TARGET_ARCH = --target=$(notdir $(CROSS_COMPILE:%-=%))
 84endif
 85
 86CLANG_SYS_INCLUDES = $(call get_sys_includes,$(CLANG),$(CLANG_TARGET_ARCH))
 87
 88BPF_CFLAGS = -g -D__TARGET_ARCH_$(SRCARCH)					\
 89	     $(if $(IS_LITTLE_ENDIAN),-mlittle-endian,-mbig-endian)		\
 90	     -I$(CURDIR)/include -I$(CURDIR)/include/bpf-compat			\
 91	     -I$(INCLUDE_DIR) -I$(APIDIR) -I$(SCXTOOLSINCDIR)			\
 92	     -I$(REPOROOT)/include						\
 93	     $(CLANG_SYS_INCLUDES) 						\
 94	     -Wall -Wno-compare-distinct-pointer-types				\
 95	     -Wno-incompatible-function-pointer-types				\
 96	     -O2 -mcpu=v3
 97
 98# sort removes libbpf duplicates when not cross-building
 99MAKE_DIRS := $(sort $(OBJ_DIR)/libbpf $(OBJ_DIR)/libbpf				\
100	       $(OBJ_DIR)/bpftool $(OBJ_DIR)/resolve_btfids			\
101	       $(HOST_OBJ_DIR) $(INCLUDE_DIR) $(SCXOBJ_DIR))
102
103$(MAKE_DIRS):
104	$(call msg,MKDIR,,$@)
105	$(Q)mkdir -p $@
106
107$(BPFOBJ): $(wildcard $(BPFDIR)/*.[ch] $(BPFDIR)/Makefile)			\
108	   $(APIDIR)/linux/bpf.h						\
109	   | $(OBJ_DIR)/libbpf
110	$(Q)$(MAKE) $(submake_extras) -C $(BPFDIR) OUTPUT=$(OBJ_DIR)/libbpf/	\
111		    ARCH=$(ARCH) CC="$(CC)" CROSS_COMPILE=$(CROSS_COMPILE)	\
112		    EXTRA_CFLAGS='-g -O0 -fPIC'					\
113		    DESTDIR=$(OUTPUT_DIR) prefix= all install_headers
114
115$(DEFAULT_BPFTOOL): $(wildcard $(BPFTOOLDIR)/*.[ch] $(BPFTOOLDIR)/Makefile)	\
116		    $(LIBBPF_OUTPUT) | $(HOST_OBJ_DIR)
117	$(Q)$(MAKE) $(submake_extras)  -C $(BPFTOOLDIR)				\
118		    ARCH= CROSS_COMPILE= CC=$(HOSTCC) LD=$(HOSTLD)		\
119		    EXTRA_CFLAGS='-g -O0'					\
120		    OUTPUT=$(HOST_OBJ_DIR)/					\
121		    LIBBPF_OUTPUT=$(HOST_LIBBPF_OUTPUT)				\
122		    LIBBPF_DESTDIR=$(HOST_LIBBPF_DESTDIR)			\
123		    prefix= DESTDIR=$(HOST_DESTDIR) install-bin
124
125$(INCLUDE_DIR)/vmlinux.h: $(VMLINUX_BTF) $(BPFTOOL) | $(INCLUDE_DIR)
126ifeq ($(VMLINUX_H),)
127	$(call msg,GEN,,$@)
128	$(Q)$(BPFTOOL) btf dump file $(VMLINUX_BTF) format c > $@
129else
130	$(call msg,CP,,$@)
131	$(Q)cp "$(VMLINUX_H)" $@
132endif
133
134$(SCXOBJ_DIR)/%.bpf.o: %.bpf.c $(INCLUDE_DIR)/vmlinux.h	| $(BPFOBJ) $(SCXOBJ_DIR)
135	$(call msg,CLNG-BPF,,$(notdir $@))
136	$(Q)$(CLANG) $(BPF_CFLAGS) -target bpf -c $< -o $@
137
138$(INCLUDE_DIR)/%.bpf.skel.h: $(SCXOBJ_DIR)/%.bpf.o $(INCLUDE_DIR)/vmlinux.h $(BPFTOOL) | $(INCLUDE_DIR)
139	$(eval sched=$(notdir $@))
140	$(call msg,GEN-SKEL,,$(sched))
141	$(Q)$(BPFTOOL) gen object $(<:.o=.linked1.o) $<
142	$(Q)$(BPFTOOL) gen object $(<:.o=.linked2.o) $(<:.o=.linked1.o)
143	$(Q)$(BPFTOOL) gen object $(<:.o=.linked3.o) $(<:.o=.linked2.o)
144	$(Q)diff $(<:.o=.linked2.o) $(<:.o=.linked3.o)
145	$(Q)$(BPFTOOL) gen skeleton $(<:.o=.linked3.o) name $(subst .bpf.skel.h,,$(sched)) > $@
146	$(Q)$(BPFTOOL) gen subskeleton $(<:.o=.linked3.o) name $(subst .bpf.skel.h,,$(sched)) > $(@:.skel.h=.subskel.h)
147
148################
149# C schedulers #
150################
151
152override define CLEAN
153	rm -rf $(OUTPUT_DIR)
154	rm -f $(TEST_GEN_PROGS)
155endef
156
157# Every testcase takes all of the BPF progs are dependencies by default. This
158# allows testcases to load any BPF scheduler, which is useful for testcases
159# that don't need their own prog to run their test.
160all_test_bpfprogs := $(foreach prog,$(wildcard *.bpf.c),$(INCLUDE_DIR)/$(patsubst %.c,%.skel.h,$(prog)))
161
162auto-test-targets :=			\
163	create_dsq			\
164	enq_last_no_enq_fails		\
165	enq_select_cpu_fails		\
166	ddsp_bogus_dsq_fail		\
167	ddsp_vtimelocal_fail		\
168	dsp_local_on			\
169	exit				\
170	hotplug				\
171	init_enable_count		\
172	maximal				\
173	maybe_null			\
174	minimal				\
175	prog_run			\
176	reload_loop			\
177	select_cpu_dfl			\
178	select_cpu_dfl_nodispatch	\
179	select_cpu_dispatch		\
180	select_cpu_dispatch_bad_dsq	\
181	select_cpu_dispatch_dbl_dsp	\
182	select_cpu_vtime		\
183	test_example			\
184
185testcase-targets := $(addsuffix .o,$(addprefix $(SCXOBJ_DIR)/,$(auto-test-targets)))
186
187$(SCXOBJ_DIR)/runner.o: runner.c | $(SCXOBJ_DIR) $(BPFOBJ)
188	$(CC) $(CFLAGS) -c $< -o $@
189
190# Create all of the test targets object files, whose testcase objects will be
191# registered into the runner in ELF constructors.
192#
193# Note that we must do double expansion here in order to support conditionally
194# compiling BPF object files only if one is present, as the wildcard Make
195# function doesn't support using implicit rules otherwise.
196$(testcase-targets): $(SCXOBJ_DIR)/%.o: %.c $(SCXOBJ_DIR)/runner.o $(all_test_bpfprogs) | $(SCXOBJ_DIR)
197	$(eval test=$(patsubst %.o,%.c,$(notdir $@)))
198	$(CC) $(CFLAGS) -c $< -o $@
199
200$(SCXOBJ_DIR)/util.o: util.c | $(SCXOBJ_DIR)
201	$(CC) $(CFLAGS) -c $< -o $@
202
203$(OUTPUT)/runner: $(SCXOBJ_DIR)/runner.o $(SCXOBJ_DIR)/util.o $(BPFOBJ) $(testcase-targets)
204	@echo "$(testcase-targets)"
205	$(CC) $(CFLAGS) -o $@ $^ $(LDFLAGS)
206
207.DEFAULT_GOAL := all
208
209.DELETE_ON_ERROR:
210
211.SECONDARY: