xref: /openbmc/linux/tools/bpf/runqslower/Makefile (revision 37744fee) 
1# SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
2OUTPUT := .output
3CLANG ?= clang
4LLC ?= llc
5LLVM_STRIP ?= llvm-strip
6DEFAULT_BPFTOOL := $(OUTPUT)/sbin/bpftool
7BPFTOOL ?= $(DEFAULT_BPFTOOL)
8LIBBPF_SRC := $(abspath ../../lib/bpf)
9BPFOBJ := $(OUTPUT)/libbpf.a
10BPF_INCLUDE := $(OUTPUT)
11INCLUDES := -I$(OUTPUT) -I$(BPF_INCLUDE) -I$(abspath ../../lib)
12CFLAGS := -g -Wall
13
14# Try to detect best kernel BTF source
15KERNEL_REL := $(shell uname -r)
16VMLINUX_BTF_PATHS := /sys/kernel/btf/vmlinux /boot/vmlinux-$(KERNEL_REL)
17VMLINUX_BTF_PATH := $(or $(VMLINUX_BTF),$(firstword			       \
18					  $(wildcard $(VMLINUX_BTF_PATHS))))
19
20abs_out := $(abspath $(OUTPUT))
21ifeq ($(V),1)
22Q =
23msg =
24else
25Q = @
26msg = @printf '  %-8s %s%s\n' "$(1)" "$(notdir $(2))" "$(if $(3), $(3))";
27MAKEFLAGS += --no-print-directory
28submake_extras := feature_display=0
29endif
30
31.DELETE_ON_ERROR:
32
33.PHONY: all clean runqslower
34all: runqslower
35
36runqslower: $(OUTPUT)/runqslower
37
38clean:
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
85