mirror of
git://nv-tegra.nvidia.com/linux-nv-oot.git
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ae64ed46c8
Instead of relying on kernel version to determine if certain functions or structure are present in the kernel, use the conftest.sh script to test which functions, structures, etc are present at compile time. This is beneficial for working with 3rd party Linux kernels that may have back-ported upstream changes into their kernel and so the kernel version checks do not work. Bug 4119327 Change-Id: I56281fa5d95862338bd8a43d6e22225c27590462 Signed-off-by: Jon Hunter <jonathanh@nvidia.com> Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/2984422 Tested-by: mobile promotions <svcmobile_promotions@nvidia.com> Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
181 lines
6.7 KiB
Makefile
181 lines
6.7 KiB
Makefile
###########################################################################
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# SPDX-License-Identifier: MIT
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# SPDX-FileCopyrightText: Copyright (c) 2023 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
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#
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# Makefile file for NVIDIA Linux conftest
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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 -Werror
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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 += class_struct_devnode_has_const_dev_arg
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NV_CONFTEST_FUNCTION_COMPILE_TESTS += devm_thermal_of_zone_register
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NV_CONFTEST_FUNCTION_COMPILE_TESTS += drm_aperture_remove_framebuffers_has_drm_driver_arg
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NV_CONFTEST_FUNCTION_COMPILE_TESTS += drm_driver_struct_has_irq_enabled_arg
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NV_CONFTEST_FUNCTION_COMPILE_TESTS += drm_fb_helper_alloc_info
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NV_CONFTEST_FUNCTION_COMPILE_TESTS += drm_fb_helper_prepare_has_preferred_bpp_arg
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NV_CONFTEST_FUNCTION_COMPILE_TESTS += drm_fb_helper_unregister_info
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NV_CONFTEST_FUNCTION_COMPILE_TESTS += drm_fb_helper_struct_has_info_arg
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NV_CONFTEST_FUNCTION_COMPILE_TESTS += drm_mode_config_struct_has_fb_base_arg
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NV_CONFTEST_FUNCTION_COMPILE_TESTS += iio_dev_opaque_has_mlock
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NV_CONFTEST_FUNCTION_COMPILE_TESTS += iommu_map_has_gfp_arg
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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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drm/display/drm_dp_aux_bus.h \
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drm/display/drm_dp_helper.h \
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drm/display/drm_scdc_helper.h \
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drm/dp/drm_dp_aux_bus.h \
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drm/dp/drm_dp_helper.h \
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drm/drm_dp_aux_bus.h \
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generated/autoconf.h \
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linux/kconfig.h \
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linux/iosys-map.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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