tools/bpf/runqslower/Makefile

   1 # SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
   2 include ../../scripts/Makefile.include
   3
   4 OUTPUT ?= $(abspath .output)/
   5
   6 BPFTOOL_OUTPUT := $(OUTPUT)bpftool/
   7 DEFAULT_BPFTOOL := $(BPFTOOL_OUTPUT)bpftool
   8 BPFTOOL ?= $(DEFAULT_BPFTOOL)
   9 LIBBPF_SRC := $(abspath ../../lib/bpf)
  10 BPFOBJ_OUTPUT := $(OUTPUT)libbpf/
  11 BPFOBJ := $(BPFOBJ_OUTPUT)libbpf.a
  12 BPF_DESTDIR := $(BPFOBJ_OUTPUT)
  13 BPF_INCLUDE := $(BPF_DESTDIR)/include
  14 INCLUDES := -I$(OUTPUT) -I$(BPF_INCLUDE) -I$(abspath ../../include/uapi)
  15 CFLAGS := -g -Wall $(CLANG_CROSS_FLAGS)
  16
  17 # Try to detect best kernel BTF source
  18 KERNEL_REL := $(shell uname -r)
  19 VMLINUX_BTF_PATHS := $(if $(O),$(O)/vmlinux)            \
  20         $(if $(KBUILD_OUTPUT),$(KBUILD_OUTPUT)/vmlinux) \
  21         ../../../vmlinux /sys/kernel/btf/vmlinux        \
  22         /boot/vmlinux-$(KERNEL_REL)
  23 VMLINUX_BTF_PATH := $(or $(VMLINUX_BTF),$(firstword                            \
  24                                           $(wildcard $(VMLINUX_BTF_PATHS))))
  25
  26 ifeq ($(V),1)
  27 Q =
  28 else
  29 Q = @
  30 MAKEFLAGS += --no-print-directory
  31 submake_extras := feature_display=0
  32 endif
  33
  34 .DELETE_ON_ERROR:
  35
  36 .PHONY: all clean runqslower libbpf_hdrs
  37 all: runqslower
  38
  39 runqslower: $(OUTPUT)/runqslower
  40
  41 clean:
  42         $(call QUIET_CLEAN, runqslower)
  43         $(Q)$(RM) -r $(BPFOBJ_OUTPUT) $(BPFTOOL_OUTPUT)
  44         $(Q)$(RM) $(OUTPUT)*.o $(OUTPUT)*.d
  45         $(Q)$(RM) $(OUTPUT)*.skel.h $(OUTPUT)vmlinux.h
  46         $(Q)$(RM) $(OUTPUT)runqslower
  47         $(Q)$(RM) -r .output
  48
  49 libbpf_hdrs: $(BPFOBJ)
  50
  51 $(OUTPUT)/runqslower: $(OUTPUT)/runqslower.o $(BPFOBJ)
  52         $(QUIET_LINK)$(CC) $(CFLAGS) $^ -lelf -lz -o $@
  53
  54 $(OUTPUT)/runqslower.o: runqslower.h $(OUTPUT)/runqslower.skel.h              \
  55                         $(OUTPUT)/runqslower.bpf.o | libbpf_hdrs
  56
  57 $(OUTPUT)/runqslower.bpf.o: $(OUTPUT)/vmlinux.h runqslower.h | libbpf_hdrs
  58
  59 $(OUTPUT)/%.skel.h: $(OUTPUT)/%.bpf.o | $(BPFTOOL)
  60         $(QUIET_GEN)$(BPFTOOL) gen skeleton $< > $@
  61
  62 $(OUTPUT)/%.bpf.o: %.bpf.c $(BPFOBJ) | $(OUTPUT)
  63         $(QUIET_GEN)$(CLANG) -g -O2 -target bpf $(INCLUDES)                   \
  64                  -c $(filter %.c,$^) -o $@ &&                                 \
  65         $(LLVM_STRIP) -g $@
  66
  67 $(OUTPUT)/%.o: %.c | $(OUTPUT)
  68         $(QUIET_CC)$(CC) $(CFLAGS) $(INCLUDES) -c $(filter %.c,$^) -o $@
  69
  70 $(OUTPUT) $(BPFOBJ_OUTPUT) $(BPFTOOL_OUTPUT):
  71         $(QUIET_MKDIR)mkdir -p $@
  72
  73 $(OUTPUT)/vmlinux.h: $(VMLINUX_BTF_PATH) | $(OUTPUT) $(BPFTOOL)
  74 ifeq ($(VMLINUX_H),)
  75         $(Q)if [ ! -e "$(VMLINUX_BTF_PATH)" ] ; then \
  76                 echo "Couldn't find kernel BTF; set VMLINUX_BTF to"            \
  77                         "specify its location." >&2;                           \
  78                 exit 1;\
  79         fi
  80         $(QUIET_GEN)$(BPFTOOL) btf dump file $(VMLINUX_BTF_PATH) format c > $@
  81 else
  82         $(Q)cp "$(VMLINUX_H)" $@
  83 endif
  84
  85 $(BPFOBJ): $(wildcard $(LIBBPF_SRC)/*.[ch] $(LIBBPF_SRC)/Makefile) | $(BPFOBJ_OUTPUT)
  86         $(Q)$(MAKE) $(submake_extras) -C $(LIBBPF_SRC) OUTPUT=$(BPFOBJ_OUTPUT) \
  87                     DESTDIR=$(BPFOBJ_OUTPUT) prefix= $(abspath $@) install_headers
  88
  89 $(DEFAULT_BPFTOOL): $(BPFOBJ) | $(BPFTOOL_OUTPUT)
  90         $(Q)$(MAKE) $(submake_extras) -C ../bpftool OUTPUT=$(BPFTOOL_OUTPUT)   \
  91                     ARCH= CROSS_COMPILE= CC=$(HOSTCC) LD=$(HOSTLD)