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