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1# SPDX-License-Identifier: GPL-2.02 3HID_SAMPLES_PATH ?= $(abspath $(src))4TOOLS_PATH := $(HID_SAMPLES_PATH)/../../tools5 6pound := \#7 8# List of programs to build9tprogs-y += hid_mouse10tprogs-y += hid_surface_dial11 12# Libbpf dependencies13LIBBPF_SRC = $(TOOLS_PATH)/lib/bpf14LIBBPF_OUTPUT = $(abspath $(HID_SAMPLES_PATH))/libbpf15LIBBPF_DESTDIR = $(LIBBPF_OUTPUT)16LIBBPF_INCLUDE = $(LIBBPF_DESTDIR)/include17LIBBPF = $(LIBBPF_OUTPUT)/libbpf.a18 19EXTRA_BPF_HEADERS := hid_bpf_helpers.h20 21hid_mouse-objs := hid_mouse.o22hid_surface_dial-objs := hid_surface_dial.o23 24# Tell kbuild to always build the programs25always-y := $(tprogs-y)26 27ifeq ($(ARCH), arm)28# Strip all except -D__LINUX_ARM_ARCH__ option needed to handle linux29# headers when arm instruction set identification is requested.30ARM_ARCH_SELECTOR := $(filter -D__LINUX_ARM_ARCH__%, $(KBUILD_CFLAGS))31BPF_EXTRA_CFLAGS := $(ARM_ARCH_SELECTOR)32TPROGS_CFLAGS += $(ARM_ARCH_SELECTOR)33endif34 35ifeq ($(ARCH), mips)36TPROGS_CFLAGS += -D__SANE_USERSPACE_TYPES__37ifdef CONFIG_MACH_LOONGSON6438BPF_EXTRA_CFLAGS += -I$(srctree)/arch/mips/include/asm/mach-loongson6439BPF_EXTRA_CFLAGS += -I$(srctree)/arch/mips/include/asm/mach-generic40endif41endif42 43TPROGS_CFLAGS += -Wall -O244TPROGS_CFLAGS += -Wmissing-prototypes45TPROGS_CFLAGS += -Wstrict-prototypes46 47TPROGS_CFLAGS += -I$(objtree)/usr/include48TPROGS_CFLAGS += -I$(LIBBPF_INCLUDE)49TPROGS_CFLAGS += -I$(srctree)/tools/include50 51ifdef SYSROOT52TPROGS_CFLAGS += --sysroot=$(SYSROOT)53TPROGS_LDFLAGS := -L$(SYSROOT)/usr/lib54endif55 56TPROGS_LDLIBS += $(LIBBPF) -lelf -lz57 58# Allows pointing LLC/CLANG to a LLVM backend with bpf support, redefine on cmdline:59# make M=samples/bpf LLC=~/git/llvm-project/llvm/build/bin/llc CLANG=~/git/llvm-project/llvm/build/bin/clang60LLC ?= llc61CLANG ?= clang62OPT ?= opt63LLVM_DIS ?= llvm-dis64LLVM_OBJCOPY ?= llvm-objcopy65LLVM_READELF ?= llvm-readelf66BTF_PAHOLE ?= pahole67 68# Detect that we're cross compiling and use the cross compiler69ifdef CROSS_COMPILE70CLANG_ARCH_ARGS = --target=$(notdir $(CROSS_COMPILE:%-=%))71endif72 73# Don't evaluate probes and warnings if we need to run make recursively74ifneq ($(src),)75HDR_PROBE := $(shell printf "$(pound)include <linux/types.h>\n struct list_head { int a; }; int main() { return 0; }" | \76 $(CC) $(TPROGS_CFLAGS) $(TPROGS_LDFLAGS) -x c - \77 -o /dev/null 2>/dev/null && echo okay)78 79ifeq ($(HDR_PROBE),)80$(warning WARNING: Detected possible issues with include path.)81$(warning WARNING: Please install kernel headers locally (make headers_install).)82endif83 84BTF_LLC_PROBE := $(shell $(LLC) -march=bpf -mattr=help 2>&1 | grep dwarfris)85BTF_PAHOLE_PROBE := $(shell $(BTF_PAHOLE) --help 2>&1 | grep BTF)86BTF_OBJCOPY_PROBE := $(shell $(LLVM_OBJCOPY) --help 2>&1 | grep -i 'usage.*llvm')87BTF_LLVM_PROBE := $(shell echo "int main() { return 0; }" | \88 $(CLANG) --target=bpf -O2 -g -c -x c - -o ./llvm_btf_verify.o; \89 $(LLVM_READELF) -S ./llvm_btf_verify.o | grep BTF; \90 /bin/rm -f ./llvm_btf_verify.o)91 92BPF_EXTRA_CFLAGS += -fno-stack-protector93ifneq ($(BTF_LLVM_PROBE),)94 BPF_EXTRA_CFLAGS += -g95else96ifneq ($(and $(BTF_LLC_PROBE),$(BTF_PAHOLE_PROBE),$(BTF_OBJCOPY_PROBE)),)97 BPF_EXTRA_CFLAGS += -g98 LLC_FLAGS += -mattr=dwarfris99 DWARF2BTF = y100endif101endif102endif103 104# Trick to allow make to be run from this directory105all:106 $(MAKE) -C ../../ M=$(CURDIR) HID_SAMPLES_PATH=$(CURDIR)107 108clean:109 $(MAKE) -C ../../ M=$(CURDIR) clean110 @find $(CURDIR) -type f -name '*~' -delete111 @$(RM) -r $(CURDIR)/libbpf $(CURDIR)/bpftool112 113$(LIBBPF): $(wildcard $(LIBBPF_SRC)/*.[ch] $(LIBBPF_SRC)/Makefile) | $(LIBBPF_OUTPUT)114# Fix up variables inherited from Kbuild that tools/ build system won't like115 $(MAKE) -C $(LIBBPF_SRC) RM='rm -rf' EXTRA_CFLAGS="$(TPROGS_CFLAGS)" \116 LDFLAGS=$(TPROGS_LDFLAGS) srctree=$(HID_SAMPLES_PATH)/../../ \117 O= OUTPUT=$(LIBBPF_OUTPUT)/ DESTDIR=$(LIBBPF_DESTDIR) prefix= \118 $@ install_headers119 120BPFTOOLDIR := $(TOOLS_PATH)/bpf/bpftool121BPFTOOL_OUTPUT := $(abspath $(HID_SAMPLES_PATH))/bpftool122BPFTOOL := $(BPFTOOL_OUTPUT)/bootstrap/bpftool123$(BPFTOOL): $(wildcard $(BPFTOOLDIR)/*.[ch] $(BPFTOOLDIR)/Makefile) | $(BPFTOOL_OUTPUT)124 $(MAKE) -C $(BPFTOOLDIR) srctree=$(HID_SAMPLES_PATH)/../../ \125 OUTPUT=$(BPFTOOL_OUTPUT)/ bootstrap126 127$(LIBBPF_OUTPUT) $(BPFTOOL_OUTPUT):128 $(call msg,MKDIR,$@)129 $(Q)mkdir -p $@130 131FORCE:132 133 134# Verify LLVM compiler tools are available and bpf target is supported by llc135.PHONY: verify_cmds verify_target_bpf $(CLANG) $(LLC)136 137verify_cmds: $(CLANG) $(LLC)138 @for TOOL in $^ ; do \139 if ! (which -- "$${TOOL}" > /dev/null 2>&1); then \140 echo "*** ERROR: Cannot find LLVM tool $${TOOL}" ;\141 exit 1; \142 else true; fi; \143 done144 145verify_target_bpf: verify_cmds146 @if ! (${LLC} -march=bpf -mattr=help > /dev/null 2>&1); then \147 echo "*** ERROR: LLVM (${LLC}) does not support 'bpf' target" ;\148 echo " NOTICE: LLVM version >= 3.7.1 required" ;\149 exit 2; \150 else true; fi151 152$(HID_SAMPLES_PATH)/*.c: verify_target_bpf $(LIBBPF)153$(src)/*.c: verify_target_bpf $(LIBBPF)154 155libbpf_hdrs: $(LIBBPF)156 157.PHONY: libbpf_hdrs158 159$(obj)/hid_mouse.o: $(obj)/hid_mouse.skel.h160$(obj)/hid_surface_dial.o: $(obj)/hid_surface_dial.skel.h161 162-include $(HID_SAMPLES_PATH)/Makefile.target163 164VMLINUX_BTF_PATHS ?= $(abspath $(if $(O),$(O)/vmlinux)) \165 $(abspath $(if $(KBUILD_OUTPUT),$(KBUILD_OUTPUT)/vmlinux)) \166 $(abspath ./vmlinux)167VMLINUX_BTF ?= $(abspath $(firstword $(wildcard $(VMLINUX_BTF_PATHS))))168 169$(obj)/vmlinux.h: $(VMLINUX_BTF) $(BPFTOOL)170ifeq ($(VMLINUX_H),)171ifeq ($(VMLINUX_BTF),)172 $(error Cannot find a vmlinux for VMLINUX_BTF at any of "$(VMLINUX_BTF_PATHS)",\173 build the kernel or set VMLINUX_BTF or VMLINUX_H variable)174endif175 $(Q)$(BPFTOOL) btf dump file $(VMLINUX_BTF) format c > $@176else177 $(Q)cp "$(VMLINUX_H)" $@178endif179 180clean-files += vmlinux.h181 182# Get Clang's default includes on this system, as opposed to those seen by183# '--target=bpf'. This fixes "missing" files on some architectures/distros,184# such as asm/byteorder.h, asm/socket.h, asm/sockios.h, sys/cdefs.h etc.185#186# Use '-idirafter': Don't interfere with include mechanics except where the187# build would have failed anyways.188define get_sys_includes189$(shell $(1) -v -E - </dev/null 2>&1 \190 | sed -n '/<...> search starts here:/,/End of search list./{ s| \(/.*\)|-idirafter \1|p }') \191$(shell $(1) -dM -E - </dev/null | grep '#define __riscv_xlen ' | sed 's/#define /-D/' | sed 's/ /=/')192endef193 194CLANG_SYS_INCLUDES = $(call get_sys_includes,$(CLANG))195 196EXTRA_BPF_HEADERS_SRC := $(addprefix $(src)/,$(EXTRA_BPF_HEADERS))197 198$(obj)/%.bpf.o: $(src)/%.bpf.c $(EXTRA_BPF_HEADERS_SRC) $(obj)/vmlinux.h199 @echo " CLANG-BPF " $@200 $(Q)$(CLANG) -g -O2 --target=bpf -D__TARGET_ARCH_$(SRCARCH) \201 -Wno-compare-distinct-pointer-types -I$(srctree)/include \202 -I$(srctree)/samples/bpf -I$(srctree)/tools/include \203 -I$(LIBBPF_INCLUDE) $(CLANG_SYS_INCLUDES) \204 -c $(filter %.bpf.c,$^) -o $@205 206LINKED_SKELS := hid_mouse.skel.h hid_surface_dial.skel.h207clean-files += $(LINKED_SKELS)208 209hid_mouse.skel.h-deps := hid_mouse.bpf.o210hid_surface_dial.skel.h-deps := hid_surface_dial.bpf.o211 212LINKED_BPF_SRCS := $(patsubst %.bpf.o,%.bpf.c,$(foreach skel,$(LINKED_SKELS),$($(skel)-deps)))213 214BPF_SRCS_LINKED := $(notdir $(wildcard $(src)/*.bpf.c))215BPF_OBJS_LINKED := $(patsubst %.bpf.c,$(obj)/%.bpf.o, $(BPF_SRCS_LINKED))216BPF_SKELS_LINKED := $(addprefix $(obj)/,$(LINKED_SKELS))217 218$(BPF_SKELS_LINKED): $(BPF_OBJS_LINKED) $(BPFTOOL)219 @echo " BPF GEN-OBJ " $(@:.skel.h=)220 $(Q)$(BPFTOOL) gen object $(@:.skel.h=.lbpf.o) $(addprefix $(obj)/,$($(@F)-deps))221 @echo " BPF GEN-SKEL" $(@:.skel.h=)222 $(Q)$(BPFTOOL) gen skeleton $(@:.skel.h=.lbpf.o) name $(notdir $(@:.skel.h=)) > $@223 224# asm/sysreg.h - inline assembly used by it is incompatible with llvm.225# But, there is no easy way to fix it, so just exclude it since it is226# useless for BPF samples.227# below we use long chain of commands, clang | opt | llvm-dis | llc,228# to generate final object file. 'clang' compiles the source into IR229# with native target, e.g., x64, arm64, etc. 'opt' does bpf CORE IR builtin230# processing (llvm12) and IR optimizations. 'llvm-dis' converts231# 'opt' output to IR, and finally 'llc' generates bpf byte code.232$(obj)/%.o: $(src)/%.c233 @echo " CLANG-bpf " $@234 $(Q)$(CLANG) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(BPF_EXTRA_CFLAGS) \235 -I$(obj) -I$(srctree)/tools/testing/selftests/bpf/ \236 -I$(LIBBPF_INCLUDE) \237 -D__KERNEL__ -D__BPF_TRACING__ -Wno-unused-value -Wno-pointer-sign \238 -D__TARGET_ARCH_$(SRCARCH) -Wno-compare-distinct-pointer-types \239 -Wno-gnu-variable-sized-type-not-at-end \240 -Wno-address-of-packed-member -Wno-tautological-compare \241 -Wno-unknown-warning-option $(CLANG_ARCH_ARGS) \242 -fno-asynchronous-unwind-tables \243 -I$(srctree)/samples/hid/ \244 -O2 -emit-llvm -Xclang -disable-llvm-passes -c $< -o - | \245 $(OPT) -O2 -mtriple=bpf-pc-linux | $(LLVM_DIS) | \246 $(LLC) -march=bpf $(LLC_FLAGS) -filetype=obj -o $@247ifeq ($(DWARF2BTF),y)248 $(BTF_PAHOLE) -J $@249endif250