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