[PATCH] selftests: sched_ext: Add sched_ext as proper selftest target
From: Björn Töpel
Date: Fri Oct 04 2024 - 05:45:21 EST
From: Björn Töpel <bjorn@xxxxxxxxxxxx>
The sched_ext selftests is missing proper cross-compilation support, a
proper target entry, and out-of-tree build support.
When building the kselftest suite, e.g.:
make ARCH=riscv CROSS_COMPILE=riscv64-linux-gnu- \
SKIP_TARGETS="" O=/output/foo -C tools/testing/selftests install
The expectation is that the sched_ext is included, cross-built, and
placed into /output/foo.
Add CROSS_COMPILE, OUTPUT, and TARGETS support to the sched_ext
selftest.
Signed-off-by: Björn Töpel <bjorn@xxxxxxxxxxxx>
---
tools/testing/selftests/Makefile | 1 +
tools/testing/selftests/sched_ext/Makefile | 59 +++++++++++++++-------
2 files changed, 41 insertions(+), 19 deletions(-)
diff --git a/tools/testing/selftests/Makefile b/tools/testing/selftests/Makefile
index b38199965f99..20ee8a0b795c 100644
--- a/tools/testing/selftests/Makefile
+++ b/tools/testing/selftests/Makefile
@@ -88,6 +88,7 @@ TARGETS += rlimits
TARGETS += rseq
TARGETS += rtc
TARGETS += rust
+TARGETS += sched_ext
TARGETS += seccomp
TARGETS += sgx
TARGETS += sigaltstack
diff --git a/tools/testing/selftests/sched_ext/Makefile b/tools/testing/selftests/sched_ext/Makefile
index 0754a2c110a1..66467a99184d 100644
--- a/tools/testing/selftests/sched_ext/Makefile
+++ b/tools/testing/selftests/sched_ext/Makefile
@@ -13,14 +13,8 @@ LLVM_SUFFIX := $(LLVM)
endif
CC := $(LLVM_PREFIX)clang$(LLVM_SUFFIX) $(CLANG_FLAGS) -fintegrated-as
-else
-CC := gcc
endif # LLVM
-ifneq ($(CROSS_COMPILE),)
-$(error CROSS_COMPILE not supported for scx selftests)
-endif # CROSS_COMPILE
-
CURDIR := $(abspath .)
REPOROOT := $(abspath ../../../..)
TOOLSDIR := $(REPOROOT)/tools
@@ -34,18 +28,39 @@ GENHDR := $(GENDIR)/autoconf.h
SCXTOOLSDIR := $(TOOLSDIR)/sched_ext
SCXTOOLSINCDIR := $(TOOLSDIR)/sched_ext/include
-OUTPUT_DIR := $(CURDIR)/build
+ifeq (,$(OUTPUT))
+OUTPUT := $(CURDIR)/build
+RUNNER_DIR := $(CURDIR)
+else
+OUTPUT_DIR := $(OUTPUT)
+RUNNER_DIR := $(OUTPUT)
+endif
OBJ_DIR := $(OUTPUT_DIR)/obj
INCLUDE_DIR := $(OUTPUT_DIR)/include
BPFOBJ_DIR := $(OBJ_DIR)/libbpf
SCXOBJ_DIR := $(OBJ_DIR)/sched_ext
BPFOBJ := $(BPFOBJ_DIR)/libbpf.a
LIBBPF_OUTPUT := $(OBJ_DIR)/libbpf/libbpf.a
-DEFAULT_BPFTOOL := $(OUTPUT_DIR)/sbin/bpftool
HOST_BUILD_DIR := $(OBJ_DIR)
HOST_OUTPUT_DIR := $(OUTPUT_DIR)
-VMLINUX_BTF_PATHS ?= ../../../../vmlinux \
+ifneq ($(CROSS_COMPILE),)
+DEFAULT_BPFTOOL := $(OUTPUT_DIR)/host/sbin/bpftool
+HOST_OBJ_DIR := $(OBJ_DIR)/host/bpftool
+HOST_LIBBPF_OUTPUT := $(OBJ_DIR)/host/libbpf/
+HOST_LIBBPF_DESTDIR := $(OUTPUT_DIR)/host/
+HOST_DESTDIR := $(OUTPUT_DIR)/host/
+else
+DEFAULT_BPFTOOL := $(OUTPUT_DIR)/sbin/bpftool
+HOST_OBJ_DIR := $(OBJ_DIR)/bpftool
+HOST_LIBBPF_OUTPUT := $(OBJ_DIR)/libbpf/
+HOST_LIBBPF_DESTDIR := $(OUTPUT_DIR)/
+HOST_DESTDIR := $(OUTPUT_DIR)/
+endif
+
+VMLINUX_BTF_PATHS ?= $(if $(O),$(O)/vmlinux) \
+ $(if $(KBUILD_OUTPUT),$(KBUILD_OUTPUT)/vmlinux) \
+ ../../../../vmlinux \
/sys/kernel/btf/vmlinux \
/boot/vmlinux-$(shell uname -r)
VMLINUX_BTF ?= $(abspath $(firstword $(wildcard $(VMLINUX_BTF_PATHS))))
@@ -80,17 +95,23 @@ IS_LITTLE_ENDIAN = $(shell $(CC) -dM -E - </dev/null | \
# Use '-idirafter': Don't interfere with include mechanics except where the
# build would have failed anyways.
define get_sys_includes
-$(shell $(1) -v -E - </dev/null 2>&1 \
+$(shell $(1) $(2) -v -E - </dev/null 2>&1 \
| sed -n '/<...> search starts here:/,/End of search list./{ s| \(/.*\)|-idirafter \1|p }') \
-$(shell $(1) -dM -E - </dev/null | grep '__riscv_xlen ' | awk '{printf("-D__riscv_xlen=%d -D__BITS_PER_LONG=%d", $$3, $$3)}')
+$(shell $(1) $(2) -dM -E - </dev/null | grep '__riscv_xlen ' | awk '{printf("-D__riscv_xlen=%d -D__BITS_PER_LONG=%d", $$3, $$3)}')
endef
+ifneq ($(CROSS_COMPILE),)
+CLANG_TARGET_ARCH = --target=$(notdir $(CROSS_COMPILE:%-=%))
+endif
+
+CLANG_SYS_INCLUDES = $(call get_sys_includes,$(CLANG),$(CLANG_TARGET_ARCH))
+
BPF_CFLAGS = -g -D__TARGET_ARCH_$(SRCARCH) \
$(if $(IS_LITTLE_ENDIAN),-mlittle-endian,-mbig-endian) \
-I$(CURDIR)/include -I$(CURDIR)/include/bpf-compat \
-I$(INCLUDE_DIR) -I$(APIDIR) -I$(SCXTOOLSINCDIR) \
-I$(REPOROOT)/include \
- $(call get_sys_includes,$(CLANG)) \
+ $(CLANG_SYS_INCLUDES) \
-Wall -Wno-compare-distinct-pointer-types \
-Wno-incompatible-function-pointer-types \
-O2 -mcpu=v3
@@ -98,7 +119,7 @@ BPF_CFLAGS = -g -D__TARGET_ARCH_$(SRCARCH) \
# sort removes libbpf duplicates when not cross-building
MAKE_DIRS := $(sort $(OBJ_DIR)/libbpf $(OBJ_DIR)/libbpf \
$(OBJ_DIR)/bpftool $(OBJ_DIR)/resolve_btfids \
- $(INCLUDE_DIR) $(SCXOBJ_DIR))
+ $(HOST_OBJ_DIR) $(INCLUDE_DIR) $(SCXOBJ_DIR))
$(MAKE_DIRS):
$(call msg,MKDIR,,$@)
@@ -112,14 +133,14 @@ $(BPFOBJ): $(wildcard $(BPFDIR)/*.[ch] $(BPFDIR)/Makefile) \
DESTDIR=$(OUTPUT_DIR) prefix= all install_headers
$(DEFAULT_BPFTOOL): $(wildcard $(BPFTOOLDIR)/*.[ch] $(BPFTOOLDIR)/Makefile) \
- $(LIBBPF_OUTPUT) | $(OBJ_DIR)/bpftool
+ $(LIBBPF_OUTPUT) | $(HOST_OBJ_DIR)
$(Q)$(MAKE) $(submake_extras) -C $(BPFTOOLDIR) \
ARCH= CROSS_COMPILE= CC=$(HOSTCC) LD=$(HOSTLD) \
EXTRA_CFLAGS='-g -O0' \
- OUTPUT=$(OBJ_DIR)/bpftool/ \
- LIBBPF_OUTPUT=$(OBJ_DIR)/libbpf/ \
- LIBBPF_DESTDIR=$(OUTPUT_DIR)/ \
- prefix= DESTDIR=$(OUTPUT_DIR)/ install-bin
+ OUTPUT=$(HOST_OBJ_DIR)/ \
+ LIBBPF_OUTPUT=$(HOST_LIBBPF_OUTPUT) \
+ LIBBPF_DESTDIR=$(HOST_LIBBPF_DESTDIR) \
+ prefix= DESTDIR=$(HOST_DESTDIR) install-bin
$(INCLUDE_DIR)/vmlinux.h: $(VMLINUX_BTF) $(BPFTOOL) | $(INCLUDE_DIR)
ifeq ($(VMLINUX_H),)
@@ -203,7 +224,7 @@ $(SCXOBJ_DIR)/util.o: util.c | $(SCXOBJ_DIR)
runner: $(SCXOBJ_DIR)/runner.o $(SCXOBJ_DIR)/util.o $(BPFOBJ) $(testcase-targets)
@echo "$(testcase-targets)"
- $(CC) $(CFLAGS) -o $@ $^ $(LDFLAGS)
+ $(CC) $(CFLAGS) -o $(RUNNER_DIR)/$@ $^ $(LDFLAGS)
TEST_GEN_PROGS := runner
base-commit: 0c559323bbaabee7346c12e74b497e283aaafef5
--
2.43.0