tools/bpf/runqslower/Makefile

   1 # SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
   2 OUTPUT := .output
   3 CLANG ?= clang
   4 LLC ?= llc
   5 LLVM_STRIP ?= llvm-strip
   6 DEFAULT_BPFTOOL := $(OUTPUT)/sbin/bpftool
   7 BPFTOOL ?= $(DEFAULT_BPFTOOL)
   8 LIBBPF_SRC := $(abspath ../../lib/bpf)
   9 BPFOBJ := $(OUTPUT)/libbpf.a
  10 BPF_INCLUDE := $(OUTPUT)
  11 INCLUDES := -I$(OUTPUT) -I$(BPF_INCLUDE) -I$(abspath ../../lib)
  12 CFLAGS := -g -Wall
  13
  14 # Try to detect best kernel BTF source
  15 KERNEL_REL := $(shell uname -r)
  16 VMLINUX_BTF_PATHS := /sys/kernel/btf/vmlinux /boot/vmlinux-$(KERNEL_REL)
  17 VMLINUX_BTF_PATH := $(or $(VMLINUX_BTF),$(firstword                            \
  18                                           $(wildcard $(VMLINUX_BTF_PATHS))))
  19
  20 abs_out := $(abspath $(OUTPUT))
  21 ifeq ($(V),1)
  22 Q =
  23 msg =
  24 else
  25 Q = @
  26 msg = @printf '  %-8s %s%s\n' "$(1)" "$(notdir $(2))" "$(if $(3), $(3))";
  27 MAKEFLAGS += --no-print-directory
  28 submake_extras := feature_display=0
  29 endif
  30
  31 .DELETE_ON_ERROR:
  32
  33 .PHONY: all clean runqslower
  34 all: runqslower
  35
  36 runqslower: $(OUTPUT)/runqslower
  37
  38 clean:
  39         $(call msg,CLEAN)
  40         $(Q)rm -rf $(OUTPUT) runqslower
  41
  42 $(OUTPUT)/runqslower: $(OUTPUT)/runqslower.o $(BPFOBJ)
  43         $(call msg,BINARY,$@)
  44         $(Q)$(CC) $(CFLAGS) $^ -lelf -lz -o $@
  45
  46 $(OUTPUT)/runqslower.o: runqslower.h $(OUTPUT)/runqslower.skel.h              \
  47                         $(OUTPUT)/runqslower.bpf.o
  48
  49 $(OUTPUT)/runqslower.bpf.o: $(OUTPUT)/vmlinux.h runqslower.h
  50
  51 $(OUTPUT)/%.skel.h: $(OUTPUT)/%.bpf.o | $(BPFTOOL)
  52         $(call msg,GEN-SKEL,$@)
  53         $(Q)$(BPFTOOL) gen skeleton $< > $@
  54
  55 $(OUTPUT)/%.bpf.o: %.bpf.c $(BPFOBJ) | $(OUTPUT)
  56         $(call msg,BPF,$@)
  57         $(Q)$(CLANG) -g -O2 -target bpf $(INCLUDES)                           \
  58                  -c $(filter %.c,$^) -o $@ &&                                 \
  59         $(LLVM_STRIP) -g $@
  60
  61 $(OUTPUT)/%.o: %.c | $(OUTPUT)
  62         $(call msg,CC,$@)
  63         $(Q)$(CC) $(CFLAGS) $(INCLUDES) -c $(filter %.c,$^) -o $@
  64
  65 $(OUTPUT):
  66         $(call msg,MKDIR,$@)
  67         $(Q)mkdir -p $(OUTPUT)
  68
  69 $(OUTPUT)/vmlinux.h: $(VMLINUX_BTF_PATH) | $(OUTPUT) $(BPFTOOL)
  70         $(call msg,GEN,$@)
  71         $(Q)if [ ! -e "$(VMLINUX_BTF_PATH)" ] ; then \
  72                 echo "Couldn't find kernel BTF; set VMLINUX_BTF to"            \
  73                         "specify its location." >&2;                           \
  74                 exit 1;\
  75         fi
  76         $(Q)$(BPFTOOL) btf dump file $(VMLINUX_BTF_PATH) format c > $@
  77
  78 $(BPFOBJ): $(wildcard $(LIBBPF_SRC)/*.[ch] $(LIBBPF_SRC)/Makefile) | $(OUTPUT)
  79         $(Q)$(MAKE) $(submake_extras) -C $(LIBBPF_SRC)                         \
  80                     OUTPUT=$(abspath $(dir $@))/ $(abspath $@)
  81
  82 $(DEFAULT_BPFTOOL):
  83         $(Q)$(MAKE) $(submake_extras) -C ../bpftool                           \
  84                     prefix= OUTPUT=$(abs_out)/ DESTDIR=$(abs_out) install