1 # SPDX-License-Identifier: GPL-2.0
2
3 HID_SAMPLES_PATH ?= $(abspath $(src))
4 TOOLS_PATH := $(HID_SAMPLES_PATH)/../../tools
5
6 pound := \#
7
8 # List of programs to build
9 tprogs-y += hid_mouse
10 tprogs-y += hid_surface_dial
11
12 # Libbpf dependencies
13 LIBBPF_SRC = $(TOOLS_PATH)/lib/bpf
14 LIBBPF_OUTPUT = $(abspath $(HID_SAMPLES_PATH))
15 LIBBPF_DESTDIR = $(LIBBPF_OUTPUT)
16 LIBBPF_INCLUDE = $(LIBBPF_DESTDIR)/include
17 LIBBPF = $(LIBBPF_OUTPUT)/libbpf.a
18
19 EXTRA_BPF_HEADERS := hid_bpf_helpers.h
20
21 hid_mouse-objs := hid_mouse.o
22 hid_surface_dial-objs := hid_surface_dial.o
23
24 # Tell kbuild to always build the programs
25 always-y := $(tprogs-y)
26
27 ifeq ($(ARCH), arm)
28 # Strip all except -D__LINUX_ARM_ARCH__ option
29 # headers when arm instruction set identificat
30 ARM_ARCH_SELECTOR := $(filter -D__LINUX_ARM_AR
31 BPF_EXTRA_CFLAGS := $(ARM_ARCH_SELECTOR)
32 TPROGS_CFLAGS += $(ARM_ARCH_SELECTOR)
33 endif
34
35 ifeq ($(ARCH), mips)
36 TPROGS_CFLAGS += -D__SANE_USERSPACE_TYPES__
37 ifdef CONFIG_MACH_LOONGSON64
38 BPF_EXTRA_CFLAGS += -I$(srctree)/arch/mips/inc
39 BPF_EXTRA_CFLAGS += -I$(srctree)/arch/mips/inc
40 endif
41 endif
42
43 TPROGS_CFLAGS += -Wall -O2
44 TPROGS_CFLAGS += -Wmissing-prototypes
45 TPROGS_CFLAGS += -Wstrict-prototypes
46
47 TPROGS_CFLAGS += -I$(objtree)/usr/include
48 TPROGS_CFLAGS += -I$(LIBBPF_INCLUDE)
49 TPROGS_CFLAGS += -I$(srctree)/tools/include
50
51 ifdef SYSROOT
52 TPROGS_CFLAGS += --sysroot=$(SYSROOT)
53 TPROGS_LDFLAGS := -L$(SYSROOT)/usr/lib
54 endif
55
56 TPROGS_LDLIBS += $(LIBBPF) -
57
58 # Allows pointing LLC/CLANG to a LLVM backend
59 # make M=samples/bpf LLC=~/git/llvm-project/ll
60 LLC ?= llc
61 CLANG ?= clang
62 OPT ?= opt
63 LLVM_DIS ?= llvm-dis
64 LLVM_OBJCOPY ?= llvm-objcopy
65 LLVM_READELF ?= llvm-readelf
66 BTF_PAHOLE ?= pahole
67
68 # Detect that we're cross compiling and use th
69 ifdef CROSS_COMPILE
70 CLANG_ARCH_ARGS = --target=$(notdir $(CROSS_CO
71 endif
72
73 # Don't evaluate probes and warnings if we nee
74 ifneq ($(src),)
75 HDR_PROBE := $(shell printf "$(pound)include <
76 $(CC) $(TPROGS_CFLAGS) $(TPROGS_LDFLAG
77 -o /dev/null 2>/dev/null && echo okay)
78
79 ifeq ($(HDR_PROBE),)
80 $(warning WARNING: Detected possible issues wi
81 $(warning WARNING: Please install kernel heade
82 endif
83
84 BTF_LLC_PROBE := $(shell $(LLC) -march=bpf -ma
85 BTF_PAHOLE_PROBE := $(shell $(BTF_PAHOLE) --he
86 BTF_OBJCOPY_PROBE := $(shell $(LLVM_OBJCOPY) -
87 BTF_LLVM_PROBE := $(shell echo "int main() { r
88 $(CLANG) --target=bp
89 $(LLVM_READELF) -S .
90 /bin/rm -f ./llvm_bt
91
92 BPF_EXTRA_CFLAGS += -fno-stack-protector
93 ifneq ($(BTF_LLVM_PROBE),)
94 BPF_EXTRA_CFLAGS += -g
95 else
96 ifneq ($(and $(BTF_LLC_PROBE),$(BTF_PAHOLE_PRO
97 BPF_EXTRA_CFLAGS += -g
98 LLC_FLAGS += -mattr=dwarfris
99 DWARF2BTF = y
100 endif
101 endif
102 endif
103
104 # Trick to allow make to be run from this dire
105 all:
106 $(MAKE) -C ../../ M=$(CURDIR) HID_SAMP
107
108 clean:
109 $(MAKE) -C ../../ M=$(CURDIR) clean
110 @find $(CURDIR) -type f -name '*~' -de
111 @$(RM) -r $(CURDIR)/libbpf $(CURDIR)/b
112
113 $(LIBBPF): $(wildcard $(LIBBPF_SRC)/*.[ch] $(L
114 # Fix up variables inherited from Kbuild that
115 $(MAKE) -C $(LIBBPF_SRC) RM='rm -rf' E
116 LDFLAGS=$(TPROGS_LDFLAGS) srct
117 O= OUTPUT=$(LIBBPF_OUTPUT)/ DE
118 $@ install_headers
119
120 BPFTOOLDIR := $(TOOLS_PATH)/bpf/bpftool
121 BPFTOOL_OUTPUT := $(abspath $(HID_SAMPLES_PATH
122 BPFTOOL := $(BPFTOOL_OUTPUT)/bootstrap/bpftool
123 $(BPFTOOL): $(wildcard $(BPFTOOLDIR)/*.[ch] $(
124 $(MAKE) -C $(BPFTOOLDIR) srctree=$(HID
125 OUTPUT=$(BPFTOOL_OUTPUT)/ boot
126
127 $(LIBBPF_OUTPUT) $(BPFTOOL_OUTPUT):
128 $(call msg,MKDIR,$@)
129 $(Q)mkdir -p $@
130
131 FORCE:
132
133
134 # Verify LLVM compiler tools are available and
135 .PHONY: verify_cmds verify_target_bpf $(CLANG)
136
137 verify_cmds: $(CLANG) $(LLC)
138 @for TOOL in $^ ; do \
139 if ! (which -- "$${TOOL}" > /d
140 echo "*** ERROR: Canno
141 exit 1; \
142 else true; fi; \
143 done
144
145 verify_target_bpf: verify_cmds
146 @if ! (${LLC} -march=bpf -mattr=help >
147 echo "*** ERROR: LLVM (${LLC})
148 echo " NOTICE: LLVM version
149 exit 2; \
150 else true; fi
151
152 $(HID_SAMPLES_PATH)/*.c: verify_target_bpf $(L
153 $(src)/*.c: verify_target_bpf $(LIBBPF)
154
155 libbpf_hdrs: $(LIBBPF)
156
157 .PHONY: libbpf_hdrs
158
159 $(obj)/hid_mouse.o: $(obj)/hid_mouse.skel.h
160 $(obj)/hid_surface_dial.o: $(obj)/hid_surface_
161
162 -include $(HID_SAMPLES_PATH)/Makefile.target
163
164 VMLINUX_BTF_PATHS ?= $(abspath $(if $(O),$(O)/
165 $(abspath $(if $(KBUILD_O
166 $(abspath ./vmlinux)
167 VMLINUX_BTF ?= $(abspath $(firstword $(wildcar
168
169 $(obj)/vmlinux.h: $(VMLINUX_BTF) $(BPFTOOL)
170 ifeq ($(VMLINUX_H),)
171 ifeq ($(VMLINUX_BTF),)
172 $(error Cannot find a vmlinux for VMLI
173 build the kernel or set VMLINU
174 endif
175 $(Q)$(BPFTOOL) btf dump file $(VMLINUX
176 else
177 $(Q)cp "$(VMLINUX_H)" $@
178 endif
179
180 clean-files += vmlinux.h
181
182 # Get Clang's default includes on this system,
183 # '--target=bpf'. This fixes "missing" files o
184 # such as asm/byteorder.h, asm/socket.h, asm/s
185 #
186 # Use '-idirafter': Don't interfere with inclu
187 # build would have failed anyways.
188 define get_sys_includes
189 $(shell $(1) -v -E - </dev/null 2>&1 \
190 | sed -n '/<...> search starts here:/,
191 $(shell $(1) -dM -E - </dev/null | grep '#defi
192 endef
193
194 CLANG_SYS_INCLUDES = $(call get_sys_includes,$
195
196 EXTRA_BPF_HEADERS_SRC := $(addprefix $(src)/,$
197
198 $(obj)/%.bpf.o: $(src)/%.bpf.c $(EXTRA_BPF_HEA
199 @echo " CLANG-BPF " $@
200 $(Q)$(CLANG) -g -O2 --target=bpf -D__T
201 -Wno-compare-distinct-pointer-
202 -I$(srctree)/samples/bpf -I$(s
203 -I$(LIBBPF_INCLUDE) $(CLANG_SY
204 -c $(filter %.bpf.c,$^) -o $@
205
206 LINKED_SKELS := hid_mouse.skel.h hid_surface_d
207 clean-files += $(LINKED_SKELS)
208
209 hid_mouse.skel.h-deps := hid_mouse.bpf.o
210 hid_surface_dial.skel.h-deps := hid_surface_di
211
212 LINKED_BPF_SRCS := $(patsubst %.bpf.o,%.bpf.c,
213
214 BPF_SRCS_LINKED := $(notdir $(wildcard $(src)/
215 BPF_OBJS_LINKED := $(patsubst %.bpf.c,$(obj)/%
216 BPF_SKELS_LINKED := $(addprefix $(obj)/,$(LINK
217
218 $(BPF_SKELS_LINKED): $(BPF_OBJS_LINKED) $(BPFT
219 @echo " BPF GEN-OBJ " $(@:.skel.h=)
220 $(Q)$(BPFTOOL) gen object $(@:.skel.h=
221 @echo " BPF GEN-SKEL" $(@:.skel.h=)
222 $(Q)$(BPFTOOL) gen skeleton $(@:.skel.
223
224 # asm/sysreg.h - inline assembly used by it is
225 # But, there is no easy way to fix it, so just
226 # useless for BPF samples.
227 # below we use long chain of commands, clang |
228 # to generate final object file. 'clang' compi
229 # with native target, e.g., x64, arm64, etc. '
230 # processing (llvm12) and IR optimizations. 'l
231 # 'opt' output to IR, and finally 'llc' genera
232 $(obj)/%.o: $(src)/%.c
233 @echo " CLANG-bpf " $@
234 $(Q)$(CLANG) $(NOSTDINC_FLAGS) $(LINUX
235 -I$(obj) -I$(srctree)/tools/te
236 -I$(LIBBPF_INCLUDE) \
237 -D__KERNEL__ -D__BPF_TRACING__
238 -D__TARGET_ARCH_$(SRCARCH) -Wn
239 -Wno-gnu-variable-sized-type-n
240 -Wno-address-of-packed-member
241 -Wno-unknown-warning-option $(
242 -fno-asynchronous-unwind-table
243 -I$(srctree)/samples/hid/ \
244 -O2 -emit-llvm -Xclang -disabl
245 $(OPT) -O2 -mtriple=bpf-pc-lin
246 $(LLC) -march=bpf $(LLC_FLAGS)
247 ifeq ($(DWARF2BTF),y)
248 $(BTF_PAHOLE) -J $@
249 endif
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