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
12TEST_PROGS += hid-multitouch.sh
13TEST_PROGS += hid-tablet.sh
14TEST_PROGS += hid-wacom.sh
15
16CXX ?= $(CROSS_COMPILE)g++
17
18HOSTPKG_CONFIG := pkg-config
19
20CFLAGS += -g -O0 -rdynamic -Wall -Werror -I$(KHDR_INCLUDES) -I$(OUTPUT)
21LDLIBS += -lelf -lz -lrt -lpthread
22
23# Silence some warnings when compiled with clang
24ifneq ($(LLVM),)
25CFLAGS += -Wno-unused-command-line-argument
26endif
27
28# Order correspond to 'make run_tests' order
29TEST_GEN_PROGS = hid_bpf
30
31# Emit succinct information message describing current building step
32# $1 - generic step name (e.g., CC, LINK, etc);
33# $2 - optional "flavor" specifier; if provided, will be emitted as [flavor];
34# $3 - target (assumed to be file); only file name will be emitted;
35# $4 - optional extra arg, emitted as-is, if provided.
36ifeq ($(V),1)
37Q =
38msg =
39else
40Q = @
41msg = @printf '  %-8s%s %s%s\n' "$(1)" "$(if $(2), [$(2)])" "$(notdir $(3))" "$(if $(4), $(4))";
42MAKEFLAGS += --no-print-directory
43submake_extras := feature_display=0
44endif
45
46# override lib.mk's default rules
47OVERRIDE_TARGETS := 1
48override define CLEAN
49	$(call msg,CLEAN)
50	$(Q)$(RM) -r $(TEST_GEN_PROGS)
51	$(Q)$(RM) -r $(EXTRA_CLEAN)
52endef
53
54include ../lib.mk
55
56TOOLSDIR := $(top_srcdir)/tools
57LIBDIR := $(TOOLSDIR)/lib
58BPFDIR := $(LIBDIR)/bpf
59TOOLSINCDIR := $(TOOLSDIR)/include
60BPFTOOLDIR := $(TOOLSDIR)/bpf/bpftool
61SCRATCH_DIR := $(OUTPUT)/tools
62BUILD_DIR := $(SCRATCH_DIR)/build
63INCLUDE_DIR := $(SCRATCH_DIR)/include
64KHDR_INCLUDES := $(SCRATCH_DIR)/uapi/include
65BPFOBJ := $(BUILD_DIR)/libbpf/libbpf.a
66ifneq ($(CROSS_COMPILE),)
67HOST_BUILD_DIR		:= $(BUILD_DIR)/host
68HOST_SCRATCH_DIR	:= $(OUTPUT)/host-tools
69HOST_INCLUDE_DIR	:= $(HOST_SCRATCH_DIR)/include
70else
71HOST_BUILD_DIR		:= $(BUILD_DIR)
72HOST_SCRATCH_DIR	:= $(SCRATCH_DIR)
73HOST_INCLUDE_DIR	:= $(INCLUDE_DIR)
74endif
75HOST_BPFOBJ := $(HOST_BUILD_DIR)/libbpf/libbpf.a
76RESOLVE_BTFIDS := $(HOST_BUILD_DIR)/resolve_btfids/resolve_btfids
77
78VMLINUX_BTF_PATHS ?= $(if $(O),$(O)/vmlinux)				\
79		     $(if $(KBUILD_OUTPUT),$(KBUILD_OUTPUT)/vmlinux)	\
80		     ../../../../vmlinux				\
81		     /sys/kernel/btf/vmlinux				\
82		     /boot/vmlinux-$(shell uname -r)
83VMLINUX_BTF ?= $(abspath $(firstword $(wildcard $(VMLINUX_BTF_PATHS))))
84ifeq ($(VMLINUX_BTF),)
85$(error Cannot find a vmlinux for VMLINUX_BTF at any of "$(VMLINUX_BTF_PATHS)")
86endif
87
88# Define simple and short `make test_progs`, `make test_sysctl`, etc targets
89# to build individual tests.
90# NOTE: Semicolon at the end is critical to override lib.mk's default static
91# rule for binaries.
92$(notdir $(TEST_GEN_PROGS)): %: $(OUTPUT)/% ;
93
94# sort removes libbpf duplicates when not cross-building
95MAKE_DIRS := $(sort $(BUILD_DIR)/libbpf $(HOST_BUILD_DIR)/libbpf		\
96	       $(HOST_BUILD_DIR)/bpftool $(HOST_BUILD_DIR)/resolve_btfids	\
97	       $(INCLUDE_DIR))
98$(MAKE_DIRS):
99	$(call msg,MKDIR,,$@)
100	$(Q)mkdir -p $@
101
102# LLVM's ld.lld doesn't support all the architectures, so use it only on x86
103ifeq ($(SRCARCH),x86)
104LLD := lld
105else
106LLD := ld
107endif
108
109DEFAULT_BPFTOOL := $(HOST_SCRATCH_DIR)/sbin/bpftool
110
111TEST_GEN_PROGS_EXTENDED += $(DEFAULT_BPFTOOL)
112
113$(TEST_GEN_PROGS) $(TEST_GEN_PROGS_EXTENDED): $(BPFOBJ)
114
115BPFTOOL ?= $(DEFAULT_BPFTOOL)
116$(DEFAULT_BPFTOOL): $(wildcard $(BPFTOOLDIR)/*.[ch] $(BPFTOOLDIR)/Makefile)    \
117		    $(HOST_BPFOBJ) | $(HOST_BUILD_DIR)/bpftool
118	$(Q)$(MAKE) $(submake_extras)  -C $(BPFTOOLDIR)			       \
119		    ARCH= CROSS_COMPILE= CC=$(HOSTCC) LD=$(HOSTLD) 	       \
120		    EXTRA_CFLAGS='-g -O0'				       \
121		    OUTPUT=$(HOST_BUILD_DIR)/bpftool/			       \
122		    LIBBPF_OUTPUT=$(HOST_BUILD_DIR)/libbpf/		       \
123		    LIBBPF_DESTDIR=$(HOST_SCRATCH_DIR)/			       \
124		    prefix= DESTDIR=$(HOST_SCRATCH_DIR)/ install-bin
125
126$(BPFOBJ): $(wildcard $(BPFDIR)/*.[ch] $(BPFDIR)/Makefile)		       \
127	   | $(BUILD_DIR)/libbpf
128	$(Q)$(MAKE) $(submake_extras) -C $(BPFDIR) OUTPUT=$(BUILD_DIR)/libbpf/ \
129		    EXTRA_CFLAGS='-g -O0'				       \
130		    DESTDIR=$(SCRATCH_DIR) prefix= all install_headers
131
132ifneq ($(BPFOBJ),$(HOST_BPFOBJ))
133$(HOST_BPFOBJ): $(wildcard $(BPFDIR)/*.[ch] $(BPFDIR)/Makefile)		       \
134		| $(HOST_BUILD_DIR)/libbpf
135	$(Q)$(MAKE) $(submake_extras) -C $(BPFDIR)                             \
136		    EXTRA_CFLAGS='-g -O0' ARCH= CROSS_COMPILE=		       \
137		    OUTPUT=$(HOST_BUILD_DIR)/libbpf/ CC=$(HOSTCC) LD=$(HOSTLD) \
138		    DESTDIR=$(HOST_SCRATCH_DIR)/ prefix= all install_headers
139endif
140
141$(INCLUDE_DIR)/vmlinux.h: $(VMLINUX_BTF) $(BPFTOOL) | $(INCLUDE_DIR)
142ifeq ($(VMLINUX_H),)
143	$(call msg,GEN,,$@)
144	$(Q)$(BPFTOOL) btf dump file $(VMLINUX_BTF) format c > $@
145else
146	$(call msg,CP,,$@)
147	$(Q)cp "$(VMLINUX_H)" $@
148endif
149
150$(KHDR_INCLUDES)/linux/hid.h: $(top_srcdir)/include/uapi/linux/hid.h
151	$(MAKE) -C $(top_srcdir) INSTALL_HDR_PATH=$(SCRATCH_DIR)/uapi headers_install
152
153$(RESOLVE_BTFIDS): $(HOST_BPFOBJ) | $(HOST_BUILD_DIR)/resolve_btfids	\
154		       $(TOOLSDIR)/bpf/resolve_btfids/main.c	\
155		       $(TOOLSDIR)/lib/rbtree.c			\
156		       $(TOOLSDIR)/lib/zalloc.c			\
157		       $(TOOLSDIR)/lib/string.c			\
158		       $(TOOLSDIR)/lib/ctype.c			\
159		       $(TOOLSDIR)/lib/str_error_r.c
160	$(Q)$(MAKE) $(submake_extras) -C $(TOOLSDIR)/bpf/resolve_btfids	\
161		CC=$(HOSTCC) LD=$(HOSTLD) AR=$(HOSTAR) \
162		LIBBPF_INCLUDE=$(HOST_INCLUDE_DIR) \
163		OUTPUT=$(HOST_BUILD_DIR)/resolve_btfids/ BPFOBJ=$(HOST_BPFOBJ)
164
165# Get Clang's default includes on this system, as opposed to those seen by
166# '-target bpf'. This fixes "missing" files on some architectures/distros,
167# such as asm/byteorder.h, asm/socket.h, asm/sockios.h, sys/cdefs.h etc.
168#
169# Use '-idirafter': Don't interfere with include mechanics except where the
170# build would have failed anyways.
171define get_sys_includes
172$(shell $(1) -v -E - </dev/null 2>&1 \
173	| sed -n '/<...> search starts here:/,/End of search list./{ s| \(/.*\)|-idirafter \1|p }') \
174$(shell $(1) -dM -E - </dev/null | grep '__riscv_xlen ' | awk '{printf("-D__riscv_xlen=%d -D__BITS_PER_LONG=%d", $$3, $$3)}')
175endef
176
177# Determine target endianness.
178IS_LITTLE_ENDIAN = $(shell $(CC) -dM -E - </dev/null | \
179			grep 'define __BYTE_ORDER__ __ORDER_LITTLE_ENDIAN__')
180MENDIAN=$(if $(IS_LITTLE_ENDIAN),-mlittle-endian,-mbig-endian)
181
182CLANG_SYS_INCLUDES = $(call get_sys_includes,$(CLANG))
183BPF_CFLAGS = -g -Werror -D__TARGET_ARCH_$(SRCARCH) $(MENDIAN) 		\
184	     -I$(INCLUDE_DIR)
185
186CLANG_CFLAGS = $(CLANG_SYS_INCLUDES) \
187	       -Wno-compare-distinct-pointer-types
188
189# Build BPF object using Clang
190# $1 - input .c file
191# $2 - output .o file
192# $3 - CFLAGS
193define CLANG_BPF_BUILD_RULE
194	$(call msg,CLNG-BPF,$(TRUNNER_BINARY),$2)
195	$(Q)$(CLANG) $3 -O2 -target bpf -c $1 -mcpu=v3 -o $2
196endef
197# Similar to CLANG_BPF_BUILD_RULE, but with disabled alu32
198define CLANG_NOALU32_BPF_BUILD_RULE
199	$(call msg,CLNG-BPF,$(TRUNNER_BINARY),$2)
200	$(Q)$(CLANG) $3 -O2 -target bpf -c $1 -mcpu=v2 -o $2
201endef
202# Build BPF object using GCC
203define GCC_BPF_BUILD_RULE
204	$(call msg,GCC-BPF,$(TRUNNER_BINARY),$2)
205	$(Q)$(BPF_GCC) $3 -O2 -c $1 -o $2
206endef
207
208BPF_PROGS_DIR := progs
209BPF_BUILD_RULE := CLANG_BPF_BUILD_RULE
210BPF_SRCS := $(notdir $(wildcard $(BPF_PROGS_DIR)/*.c))
211BPF_OBJS := $(patsubst %.c,$(OUTPUT)/%.bpf.o, $(BPF_SRCS))
212BPF_SKELS := $(patsubst %.c,$(OUTPUT)/%.skel.h, $(BPF_SRCS))
213TEST_GEN_FILES += $(BPF_OBJS)
214
215$(BPF_PROGS_DIR)-bpfobjs := y
216$(BPF_OBJS): $(OUTPUT)/%.bpf.o:				\
217	     $(BPF_PROGS_DIR)/%.c			\
218	     $(wildcard $(BPF_PROGS_DIR)/*.h)		\
219	     $(INCLUDE_DIR)/vmlinux.h				\
220	     $(wildcard $(BPFDIR)/hid_bpf_*.h)			\
221	     $(wildcard $(BPFDIR)/*.bpf.h)			\
222	     | $(OUTPUT) $(BPFOBJ)
223	$(call $(BPF_BUILD_RULE),$<,$@, $(BPF_CFLAGS))
224
225$(BPF_SKELS): %.skel.h: %.bpf.o $(BPFTOOL) | $(OUTPUT)
226	$(call msg,GEN-SKEL,$(BINARY),$@)
227	$(Q)$(BPFTOOL) gen object $(<:.o=.linked1.o) $<
228	$(Q)$(BPFTOOL) gen skeleton $(<:.o=.linked1.o) name $(notdir $(<:.bpf.o=)) > $@
229
230$(OUTPUT)/%.o: %.c $(BPF_SKELS) $(KHDR_INCLUDES)/linux/hid.h
231	$(call msg,CC,,$@)
232	$(Q)$(CC) $(CFLAGS) -c $(filter %.c,$^) $(LDLIBS) -o $@
233
234$(OUTPUT)/%: $(OUTPUT)/%.o
235	$(call msg,BINARY,,$@)
236	$(Q)$(LINK.c) $^ $(LDLIBS) -o $@
237
238EXTRA_CLEAN := $(SCRATCH_DIR) $(HOST_SCRATCH_DIR) feature bpftool	\
239	$(addprefix $(OUTPUT)/,*.o *.skel.h no_alu32)
240