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git://nv-tegra.nvidia.com/linux-nv-oot.git
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2360391866
The script conftest.sh can be used at build time to determine which kernel headers or versions of kernel functions/macros are present in the kernel that drivers are being compiled against. This is useful for cases where changes are backported from upstream Linux kernels that may change kernel functions and so we can no longer rely on the kernel version to indicate which version of the kernel function to use. The conftest.h header file is a top-level header file that includes all the header files that are generated by the conftest.sh script. This header file can be included by drivers so that they can use the various definitions that are generated by conftest.sh. This file is located along with the conftest.sh script because this is copied to the output directory where all the generated header files are placed. Bug 4119327 Bug 4228080 Change-Id: I781884e359e9688640661548620e01a178debac9 Signed-off-by: Jon Hunter <jonathanh@nvidia.com> Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/2974065 Reviewed-by: Laxman Dewangan <ldewangan@nvidia.com>
161 lines
5.7 KiB
Makefile
161 lines
5.7 KiB
Makefile
###########################################################################
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# Kbuild file for NVIDIA Linux GPU driver kernel modules
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###########################################################################
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#
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# The parent makefile is expected to define:
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#
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# NV_KERNEL_SOURCES : The root of the kernel source tree.
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# NV_KERNEL_OUTPUT : The kernel's output tree.
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# NV_KERNEL_MODULES : A whitespace-separated list of modules to build.
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# ARCH : The target CPU architecture: x86_64|arm64|powerpc
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#
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# Kbuild provides the variables:
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#
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# $(src) : The directory containing this Kbuild file.
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# $(obj) : The directory where the output from this build is written.
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#
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#
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# The conftest.sh script tests various aspects of the target kernel.
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# The per-module Kbuild files included above should:
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#
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# - Append to the NV_CONFTEST_*_COMPILE_TESTS variables to indicate
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# which conftests they require.
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# - Append to the NV_OBJECTS_DEPEND_ON_CONFTEST variable any object files
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# that depend on conftest.
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#
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# The conftest machinery below will run the requested tests and
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# generate the appropriate header files.
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#
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CC ?= cc
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LD ?= ld
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NV_CONFTEST_SCRIPT := $(src)/conftest.sh
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NV_CONFTEST_HEADER := $(obj)/conftest/headers.h
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NV_CONFTEST_CMD := /bin/sh $(NV_CONFTEST_SCRIPT) \
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"$(CC)" $(ARCH) $(NV_KERNEL_SOURCES) $(NV_KERNEL_OUTPUT)
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NV_CFLAGS_FROM_CONFTEST := $(shell $(NV_CONFTEST_CMD) build_cflags)
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NV_CONFTEST_CFLAGS = $(NV_CFLAGS_FROM_CONFTEST) $(EXTRA_CFLAGS) -fno-pie
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NV_CONFTEST_COMPILE_TEST_HEADERS := $(obj)/conftest/macros.h
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NV_CONFTEST_COMPILE_TEST_HEADERS += $(obj)/conftest/functions.h
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NV_CONFTEST_COMPILE_TEST_HEADERS += $(obj)/conftest/symbols.h
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NV_CONFTEST_COMPILE_TEST_HEADERS += $(obj)/conftest/types.h
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NV_CONFTEST_COMPILE_TEST_HEADERS += $(obj)/conftest/generic.h
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NV_CONFTEST_HEADERS := $(obj)/conftest/patches.h
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NV_CONFTEST_HEADERS += $(obj)/conftest/headers.h
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NV_CONFTEST_HEADERS += $(NV_CONFTEST_COMPILE_TEST_HEADERS)
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all: $(NV_CONFTEST_HEADERS)
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#
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# Generate a header file for a single conftest compile test. Each compile test
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# header depends on conftest.sh, as well as the generated conftest/headers.h
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# file, which is included in the compile test preamble.
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#
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$(obj)/conftest/compile-tests/%.h: $(NV_CONFTEST_SCRIPT) $(NV_CONFTEST_HEADER)
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@mkdir -p $(obj)/conftest/compile-tests
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@echo " CONFTEST: $(notdir $*)"
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@$(NV_CONFTEST_CMD) compile_tests '$(NV_CONFTEST_CFLAGS)' \
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$(notdir $*) > $@
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#
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# Concatenate a conftest/*.h header from its constituent compile test headers
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#
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# $(1): The name of the concatenated header
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# $(2): The list of compile tests that make up the header
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#
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define NV_GENERATE_COMPILE_TEST_HEADER
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$(obj)/conftest/$(1).h: $(addprefix $(obj)/conftest/compile-tests/,$(addsuffix .h,$(2)))
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@mkdir -p $(obj)/conftest
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@# concatenate /dev/null to prevent cat from hanging when $$^ is empty
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@cat $$^ /dev/null > $$@
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endef
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#
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# Generate the conftest compile test headers from the lists of compile tests
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# provided by the module-specific Kbuild files.
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#
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NV_CONFTEST_FUNCTION_COMPILE_TESTS ?=
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NV_CONFTEST_GENERIC_COMPILE_TESTS ?=
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NV_CONFTEST_MACRO_COMPILE_TESTS ?=
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NV_CONFTEST_SYMBOL_COMPILE_TESTS ?=
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NV_CONFTEST_TYPE_COMPILE_TESTS ?=
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$(eval $(call NV_GENERATE_COMPILE_TEST_HEADER,functions,$(NV_CONFTEST_FUNCTION_COMPILE_TESTS)))
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$(eval $(call NV_GENERATE_COMPILE_TEST_HEADER,generic,$(NV_CONFTEST_GENERIC_COMPILE_TESTS)))
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$(eval $(call NV_GENERATE_COMPILE_TEST_HEADER,macros,$(NV_CONFTEST_MACRO_COMPILE_TESTS)))
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$(eval $(call NV_GENERATE_COMPILE_TEST_HEADER,symbols,$(NV_CONFTEST_SYMBOL_COMPILE_TESTS)))
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$(eval $(call NV_GENERATE_COMPILE_TEST_HEADER,types,$(NV_CONFTEST_TYPE_COMPILE_TESTS)))
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$(obj)/conftest/patches.h: $(NV_CONFTEST_SCRIPT)
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@mkdir -p $(obj)/conftest
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@$(NV_CONFTEST_CMD) patch_check > $@
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# Each of these headers is checked for presence with a test #include; a
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# corresponding #define will be generated in conftest/headers.h.
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NV_HEADER_PRESENCE_TESTS = \
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generated/autoconf.h \
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linux/kconfig.h
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# Filename to store the define for the header in $(1); this is only consumed by
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# the rule below that concatenates all of these together.
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NV_HEADER_PRESENCE_PART = $(addprefix $(obj)/conftest/header_presence/,$(addsuffix .part,$(1)))
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# Define a rule to check the header $(1).
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define NV_HEADER_PRESENCE_CHECK
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$$(call NV_HEADER_PRESENCE_PART,$(1)): $$(NV_CONFTEST_SCRIPT) $(obj)/conftest/uts_release
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@mkdir -p $$(dir $$@)
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@$$(NV_CONFTEST_CMD) test_kernel_header '$$(NV_CONFTEST_CFLAGS)' '$(1)' > $$@
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endef
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# Evaluate the rule above for each header in the list.
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$(foreach header,$(NV_HEADER_PRESENCE_TESTS),$(eval $(call NV_HEADER_PRESENCE_CHECK,$(header))))
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# Concatenate all of the parts into headers.h.
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$(obj)/conftest/headers.h: $(call NV_HEADER_PRESENCE_PART,$(NV_HEADER_PRESENCE_TESTS))
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@cat $^ > $@
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clean-dirs := $(obj)/conftest
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# For any object files that depend on conftest, declare the dependency here.
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$(addprefix $(obj)/,$(NV_OBJECTS_DEPEND_ON_CONFTEST)): | $(NV_CONFTEST_HEADERS)
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# Sanity checks of the build environment and target system/kernel
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BUILD_SANITY_CHECKS = \
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cc_sanity_check \
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cc_version_check \
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module_symvers_sanity_check
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.PHONY: $(BUILD_SANITY_CHECKS)
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$(BUILD_SANITY_CHECKS):
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@$(NV_CONFTEST_CMD) $@ full_output
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# Perform all sanity checks before generating the conftest headers
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$(NV_CONFTEST_HEADERS): | $(BUILD_SANITY_CHECKS)
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# Make the conftest headers depend on the kernel version string
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$(obj)/conftest/uts_release: NV_GENERATE_UTS_RELEASE
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@mkdir -p $(dir $@)
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@NV_UTS_RELEASE="// Kernel version: `$(NV_CONFTEST_CMD) compile_tests '$(NV_CONFTEST_CFLAGS)' uts_release`"; \
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if ! [ -f "$@" ] || [ "$$NV_UTS_RELEASE" != "`cat $@`" ]; \
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then echo "$$NV_UTS_RELEASE" > $@; fi
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.PHONY: NV_GENERATE_UTS_RELEASE
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$(NV_CONFTEST_HEADERS): $(obj)/conftest/uts_release
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