drivers/hid/bpf/progs/Makefile

   1 # SPDX-License-Identifier: GPL-2.0
   2 OUTPUT := .output
   3 abs_out := $(abspath $(OUTPUT))
   4
   5 CLANG ?= clang
   6 LLC ?= llc
   7 LLVM_STRIP ?= llvm-strip
   8
   9 TOOLS_PATH := $(abspath ../../../../tools)
  10 BPFTOOL_SRC := $(TOOLS_PATH)/bpf/bpftool
  11 BPFTOOL_OUTPUT := $(abs_out)/bpftool
  12 DEFAULT_BPFTOOL := $(BPFTOOL_OUTPUT)/bootstrap/bpftool
  13 BPFTOOL ?= $(DEFAULT_BPFTOOL)
  14
  15 LIBBPF_SRC := $(TOOLS_PATH)/lib/bpf
  16 LIBBPF_OUTPUT := $(abs_out)/libbpf
  17 LIBBPF_DESTDIR := $(LIBBPF_OUTPUT)
  18 LIBBPF_INCLUDE := $(LIBBPF_DESTDIR)/include
  19 BPFOBJ := $(LIBBPF_OUTPUT)/libbpf.a
  20
  21 INCLUDES := -I$(OUTPUT) -I$(LIBBPF_INCLUDE) -I$(TOOLS_PATH)/include/uapi
  22 CFLAGS := -g -Wall
  23
  24 VMLINUX_BTF_PATHS ?= $(if $(O),$(O)/vmlinux)                            \
  25                      $(if $(KBUILD_OUTPUT),$(KBUILD_OUTPUT)/vmlinux)    \
  26                      ../../../../vmlinux                                \
  27                      /sys/kernel/btf/vmlinux                            \
  28                      /boot/vmlinux-$(shell uname -r)
  29 VMLINUX_BTF ?= $(abspath $(firstword $(wildcard $(VMLINUX_BTF_PATHS))))
  30 ifeq ($(VMLINUX_BTF),)
  31 $(error Cannot find a vmlinux for VMLINUX_BTF at any of "$(VMLINUX_BTF_PATHS)")
  32 endif
  33
  34 ifeq ($(V),1)
  35 Q =
  36 msg =
  37 else
  38 Q = @
  39 msg = @printf '  %-8s %s%s\n' "$(1)" "$(notdir $(2))" "$(if $(3), $(3))";
  40 MAKEFLAGS += --no-print-directory
  41 submake_extras := feature_display=0
  42 endif
  43
  44 .DELETE_ON_ERROR:
  45
  46 .PHONY: all clean
  47
  48 SOURCES = $(wildcard *.bpf.c)
  49 TARGETS = $(SOURCES:.bpf.c=.bpf.o)
  50
  51 all: $(TARGETS)
  52
  53 clean:
  54         $(call msg,CLEAN)
  55         $(Q)rm -rf $(OUTPUT) $(TARGETS)
  56
  57 %.bpf.o: %.bpf.c vmlinux.h $(BPFOBJ) | $(OUTPUT)
  58         $(call msg,BPF,$@)
  59         $(Q)$(CLANG) -g -O2 --target=bpf -Wall -Werror $(INCLUDES)            \
  60                  -c $(filter %.c,$^) -o $@ &&                                 \
  61         $(LLVM_STRIP) -g $@
  62
  63 vmlinux.h: $(VMLINUX_BTF) $(BPFTOOL) | $(INCLUDE_DIR)
  64 ifeq ($(VMLINUX_H),)
  65         $(call msg,GEN,,$@)
  66         $(Q)$(BPFTOOL) btf dump file $(VMLINUX_BTF) format c > $@
  67 else
  68         $(call msg,CP,,$@)
  69         $(Q)cp "$(VMLINUX_H)" $@
  70 endif
  71
  72 $(OUTPUT) $(LIBBPF_OUTPUT) $(BPFTOOL_OUTPUT):
  73         $(call msg,MKDIR,$@)
  74         $(Q)mkdir -p $@
  75
  76 $(BPFOBJ): $(wildcard $(LIBBPF_SRC)/*.[ch] $(LIBBPF_SRC)/Makefile) | $(LIBBPF_OUTPUT)
  77         $(Q)$(MAKE) $(submake_extras) -C $(LIBBPF_SRC)                         \
  78                     OUTPUT=$(abspath $(dir $@))/ prefix=                       \
  79                     DESTDIR=$(LIBBPF_DESTDIR) $(abspath $@) install_headers
  80
  81 ifeq ($(CROSS_COMPILE),)
  82 $(DEFAULT_BPFTOOL): $(BPFOBJ) | $(BPFTOOL_OUTPUT)
  83         $(Q)$(MAKE) $(submake_extras) -C $(BPFTOOL_SRC)                        \
  84                     OUTPUT=$(BPFTOOL_OUTPUT)/                                  \
  85                     LIBBPF_BOOTSTRAP_OUTPUT=$(LIBBPF_OUTPUT)/                  \
  86                     LIBBPF_BOOTSTRAP_DESTDIR=$(LIBBPF_DESTDIR)/ bootstrap
  87 else
  88 $(DEFAULT_BPFTOOL): | $(BPFTOOL_OUTPUT)
  89         $(Q)$(MAKE) $(submake_extras) -C $(BPFTOOL_SRC)                        \
  90                     OUTPUT=$(BPFTOOL_OUTPUT)/ bootstrap
  91 endif