1# SPDX-License-Identifier: GPL-2.0
2
3# based on tools/testing/selftest/bpf/Makefile
4include ../../../build/Build.include
5include ../../../scripts/Makefile.arch
6include ../../../scripts/Makefile.include
7
8TEST_PROGS := hid-core.sh
9TEST_PROGS += hid-gamepad.sh
10TEST_PROGS += hid-keyboard.sh
11TEST_PROGS += hid-mouse.sh
12
13CXX ?= $(CROSS_COMPILE)g++
14
15HOSTPKG_CONFIG := pkg-config
16
17CFLAGS += -g -O0 -rdynamic -Wall -Werror -I$(KHDR_INCLUDES) -I$(OUTPUT)
18LDLIBS += -lelf -lz -lrt -lpthread
19
20# Silence some warnings when compiled with clang
21ifneq ($(LLVM),)
22CFLAGS += -Wno-unused-command-line-argument
23endif
24
25# Order correspond to 'make run_tests' order
26TEST_GEN_PROGS = hid_bpf
27
28# Emit succinct information message describing current building step
29# $1 - generic step name (e.g., CC, LINK, etc);
30# $2 - optional "flavor" specifier; if provided, will be emitted as [flavor];
31# $3 - target (assumed to be file); only file name will be emitted;
32# $4 - optional extra arg, emitted as-is, if provided.
33ifeq ($(V),1)
34Q =
35msg =
36else
37Q = @
38msg = @printf '  %-8s%s %s%s\n' "$(1)" "$(if $(2), [$(2)])" "$(notdir $(3))" "$(if $(4), $(4))";
39MAKEFLAGS += --no-print-directory
40submake_extras := feature_display=0
41endif
42
43# override lib.mk's default rules
44OVERRIDE_TARGETS := 1
45override define CLEAN
46	$(call msg,CLEAN)
47	$(Q)$(RM) -r $(TEST_GEN_PROGS)
48	$(Q)$(RM) -r $(EXTRA_CLEAN)
49endef
50
51include ../lib.mk
52
53TOOLSDIR := $(top_srcdir)/tools
54LIBDIR := $(TOOLSDIR)/lib
55BPFDIR := $(LIBDIR)/bpf
56TOOLSINCDIR := $(TOOLSDIR)/include
57BPFTOOLDIR := $(TOOLSDIR)/bpf/bpftool
58SCRATCH_DIR := $(OUTPUT)/tools
59BUILD_DIR := $(SCRATCH_DIR)/build
60INCLUDE_DIR := $(SCRATCH_DIR)/include
61KHDR_INCLUDES := $(SCRATCH_DIR)/uapi/include
62BPFOBJ := $(BUILD_DIR)/libbpf/libbpf.a
63ifneq ($(CROSS_COMPILE),)
64HOST_BUILD_DIR		:= $(BUILD_DIR)/host
65HOST_SCRATCH_DIR	:= $(OUTPUT)/host-tools
66HOST_INCLUDE_DIR	:= $(HOST_SCRATCH_DIR)/include
67else
68HOST_BUILD_DIR		:= $(BUILD_DIR)
69HOST_SCRATCH_DIR	:= $(SCRATCH_DIR)
70HOST_INCLUDE_DIR	:= $(INCLUDE_DIR)
71endif
72HOST_BPFOBJ := $(HOST_BUILD_DIR)/libbpf/libbpf.a
73RESOLVE_BTFIDS := $(HOST_BUILD_DIR)/resolve_btfids/resolve_btfids
74
75VMLINUX_BTF_PATHS ?= $(if $(O),$(O)/vmlinux)				\
76		     $(if $(KBUILD_OUTPUT),$(KBUILD_OUTPUT)/vmlinux)	\
77		     ../../../../vmlinux				\
78		     /sys/kernel/btf/vmlinux				\
79		     /boot/vmlinux-$(shell uname -r)
80VMLINUX_BTF ?= $(abspath $(firstword $(wildcard $(VMLINUX_BTF_PATHS))))
81ifeq ($(VMLINUX_BTF),)
82$(error Cannot find a vmlinux for VMLINUX_BTF at any of "$(VMLINUX_BTF_PATHS)")
83endif
84
85# Define simple and short `make test_progs`, `make test_sysctl`, etc targets
86# to build individual tests.
87# NOTE: Semicolon at the end is critical to override lib.mk's default static
88# rule for binaries.
89$(notdir $(TEST_GEN_PROGS)): %: $(OUTPUT)/% ;
90
91# sort removes libbpf duplicates when not cross-building
92MAKE_DIRS := $(sort $(BUILD_DIR)/libbpf $(HOST_BUILD_DIR)/libbpf		\
93	       $(HOST_BUILD_DIR)/bpftool $(HOST_BUILD_DIR)/resolve_btfids	\
94	       $(INCLUDE_DIR))
95$(MAKE_DIRS):
96	$(call msg,MKDIR,,$@)
97	$(Q)mkdir -p $@
98
99# LLVM's ld.lld doesn't support all the architectures, so use it only on x86
100ifeq ($(SRCARCH),x86)
101LLD := lld
102else
103LLD := ld
104endif
105
106DEFAULT_BPFTOOL := $(HOST_SCRATCH_DIR)/sbin/bpftool
107
108TEST_GEN_PROGS_EXTENDED += $(DEFAULT_BPFTOOL)
109
110$(TEST_GEN_PROGS) $(TEST_GEN_PROGS_EXTENDED): $(BPFOBJ)
111
112BPFTOOL ?= $(DEFAULT_BPFTOOL)
113$(DEFAULT_BPFTOOL): $(wildcard $(BPFTOOLDIR)/*.[ch] $(BPFTOOLDIR)/Makefile)    \
114		    $(HOST_BPFOBJ) | $(HOST_BUILD_DIR)/bpftool
115	$(Q)$(MAKE) $(submake_extras)  -C $(BPFTOOLDIR)			       \
116		    ARCH= CROSS_COMPILE= CC=$(HOSTCC) LD=$(HOSTLD) 	       \
117		    EXTRA_CFLAGS='-g -O0'				       \
118		    OUTPUT=$(HOST_BUILD_DIR)/bpftool/			       \
119		    LIBBPF_OUTPUT=$(HOST_BUILD_DIR)/libbpf/		       \
120		    LIBBPF_DESTDIR=$(HOST_SCRATCH_DIR)/			       \
121		    prefix= DESTDIR=$(HOST_SCRATCH_DIR)/ install-bin
122
123$(BPFOBJ): $(wildcard $(BPFDIR)/*.[ch] $(BPFDIR)/Makefile)		       \
124	   | $(BUILD_DIR)/libbpf
125	$(Q)$(MAKE) $(submake_extras) -C $(BPFDIR) OUTPUT=$(BUILD_DIR)/libbpf/ \
126		    EXTRA_CFLAGS='-g -O0'				       \
127		    DESTDIR=$(SCRATCH_DIR) prefix= all install_headers
128
129ifneq ($(BPFOBJ),$(HOST_BPFOBJ))
130$(HOST_BPFOBJ): $(wildcard $(BPFDIR)/*.[ch] $(BPFDIR)/Makefile)		       \
131		| $(HOST_BUILD_DIR)/libbpf
132	$(Q)$(MAKE) $(submake_extras) -C $(BPFDIR)                             \
133		    EXTRA_CFLAGS='-g -O0' ARCH= CROSS_COMPILE=		       \
134		    OUTPUT=$(HOST_BUILD_DIR)/libbpf/ CC=$(HOSTCC) LD=$(HOSTLD) \
135		    DESTDIR=$(HOST_SCRATCH_DIR)/ prefix= all install_headers
136endif
137
138$(INCLUDE_DIR)/vmlinux.h: $(VMLINUX_BTF) $(BPFTOOL) | $(INCLUDE_DIR)
139ifeq ($(VMLINUX_H),)
140	$(call msg,GEN,,$@)
141	$(Q)$(BPFTOOL) btf dump file $(VMLINUX_BTF) format c > $@
142else
143	$(call msg,CP,,$@)
144	$(Q)cp "$(VMLINUX_H)" $@
145endif
146
147$(KHDR_INCLUDES)/linux/hid.h: $(top_srcdir)/include/uapi/linux/hid.h
148	$(MAKE) -C $(top_srcdir) INSTALL_HDR_PATH=$(SCRATCH_DIR)/uapi headers_install
149
150$(RESOLVE_BTFIDS): $(HOST_BPFOBJ) | $(HOST_BUILD_DIR)/resolve_btfids	\
151		       $(TOOLSDIR)/bpf/resolve_btfids/main.c	\
152		       $(TOOLSDIR)/lib/rbtree.c			\
153		       $(TOOLSDIR)/lib/zalloc.c			\
154		       $(TOOLSDIR)/lib/string.c			\
155		       $(TOOLSDIR)/lib/ctype.c			\
156		       $(TOOLSDIR)/lib/str_error_r.c
157	$(Q)$(MAKE) $(submake_extras) -C $(TOOLSDIR)/bpf/resolve_btfids	\
158		CC=$(HOSTCC) LD=$(HOSTLD) AR=$(HOSTAR) \
159		LIBBPF_INCLUDE=$(HOST_INCLUDE_DIR) \
160		OUTPUT=$(HOST_BUILD_DIR)/resolve_btfids/ BPFOBJ=$(HOST_BPFOBJ)
161
162# Get Clang's default includes on this system, as opposed to those seen by
163# '-target bpf'. This fixes "missing" files on some architectures/distros,
164# such as asm/byteorder.h, asm/socket.h, asm/sockios.h, sys/cdefs.h etc.
165#
166# Use '-idirafter': Don't interfere with include mechanics except where the
167# build would have failed anyways.
168define get_sys_includes
169$(shell $(1) -v -E - </dev/null 2>&1 \
170	| sed -n '/<...> search starts here:/,/End of search list./{ s| \(/.*\)|-idirafter \1|p }') \
171$(shell $(1) -dM -E - </dev/null | grep '__riscv_xlen ' | awk '{printf("-D__riscv_xlen=%d -D__BITS_PER_LONG=%d", $$3, $$3)}')
172endef
173
174# Determine target endianness.
175IS_LITTLE_ENDIAN = $(shell $(CC) -dM -E - </dev/null | \
176			grep 'define __BYTE_ORDER__ __ORDER_LITTLE_ENDIAN__')
177MENDIAN=$(if $(IS_LITTLE_ENDIAN),-mlittle-endian,-mbig-endian)
178
179CLANG_SYS_INCLUDES = $(call get_sys_includes,$(CLANG))
180BPF_CFLAGS = -g -Werror -D__TARGET_ARCH_$(SRCARCH) $(MENDIAN) 		\
181	     -I$(INCLUDE_DIR)
182
183CLANG_CFLAGS = $(CLANG_SYS_INCLUDES) \
184	       -Wno-compare-distinct-pointer-types
185
186# Build BPF object using Clang
187# $1 - input .c file
188# $2 - output .o file
189# $3 - CFLAGS
190define CLANG_BPF_BUILD_RULE
191	$(call msg,CLNG-BPF,$(TRUNNER_BINARY),$2)
192	$(Q)$(CLANG) $3 -O2 -target bpf -c $1 -mcpu=v3 -o $2
193endef
194# Similar to CLANG_BPF_BUILD_RULE, but with disabled alu32
195define CLANG_NOALU32_BPF_BUILD_RULE
196	$(call msg,CLNG-BPF,$(TRUNNER_BINARY),$2)
197	$(Q)$(CLANG) $3 -O2 -target bpf -c $1 -mcpu=v2 -o $2
198endef
199# Build BPF object using GCC
200define GCC_BPF_BUILD_RULE
201	$(call msg,GCC-BPF,$(TRUNNER_BINARY),$2)
202	$(Q)$(BPF_GCC) $3 -O2 -c $1 -o $2
203endef
204
205BPF_PROGS_DIR := progs
206BPF_BUILD_RULE := CLANG_BPF_BUILD_RULE
207BPF_SRCS := $(notdir $(wildcard $(BPF_PROGS_DIR)/*.c))
208BPF_OBJS := $(patsubst %.c,$(OUTPUT)/%.bpf.o, $(BPF_SRCS))
209BPF_SKELS := $(patsubst %.c,$(OUTPUT)/%.skel.h, $(BPF_SRCS))
210TEST_GEN_FILES += $(BPF_OBJS)
211
212$(BPF_PROGS_DIR)-bpfobjs := y
213$(BPF_OBJS): $(OUTPUT)/%.bpf.o:				\
214	     $(BPF_PROGS_DIR)/%.c			\
215	     $(wildcard $(BPF_PROGS_DIR)/*.h)		\
216	     $(INCLUDE_DIR)/vmlinux.h				\
217	     $(wildcard $(BPFDIR)/hid_bpf_*.h)			\
218	     $(wildcard $(BPFDIR)/*.bpf.h)			\
219	     | $(OUTPUT) $(BPFOBJ)
220	$(call $(BPF_BUILD_RULE),$<,$@, $(BPF_CFLAGS))
221
222$(BPF_SKELS): %.skel.h: %.bpf.o $(BPFTOOL) | $(OUTPUT)
223	$(call msg,GEN-SKEL,$(BINARY),$@)
224	$(Q)$(BPFTOOL) gen object $(<:.o=.linked1.o) $<
225	$(Q)$(BPFTOOL) gen skeleton $(<:.o=.linked1.o) name $(notdir $(<:.bpf.o=)) > $@
226
227$(OUTPUT)/%.o: %.c $(BPF_SKELS) $(KHDR_INCLUDES)/linux/hid.h
228	$(call msg,CC,,$@)
229	$(Q)$(CC) $(CFLAGS) -c $(filter %.c,$^) $(LDLIBS) -o $@
230
231$(OUTPUT)/%: $(OUTPUT)/%.o
232	$(call msg,BINARY,,$@)
233	$(Q)$(LINK.c) $^ $(LDLIBS) -o $@
234
235EXTRA_CLEAN := $(SCRATCH_DIR) $(HOST_SCRATCH_DIR) feature bpftool	\
236	$(addprefix $(OUTPUT)/,*.o *.skel.h no_alu32)
237