292 lines
9.3 KiB
Makefile
292 lines
9.3 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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# $(obj) : The directory where the output from this build is written.
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#
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NV_BUILD_TYPE ?= release
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#
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# Utility macro ASSIGN_PER_OBJ_CFLAGS: to control CFLAGS on a
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# per-object basis, Kbuild honors the 'CFLAGS_$(object)' variable.
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# E.g., "CFLAGS_nv.o" for CFLAGS that are specific to nv.o. Use this
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# macro to assign 'CFLAGS_$(object)' variables for multiple object
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# files.
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#
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# $(1): The object files.
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# $(2): The CFLAGS to add for those object files.
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#
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# With kernel git commit 54b8ae66ae1a3454a7645d159a482c31cd89ab33, the
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# handling of object-specific CFLAGs, CFLAGS_$(object) has changed. Prior to
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# this commit, the CFLAGS_$(object) variable was required to be defined with
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# only the the object name (<CFLAGS_somefile.o>). With the aforementioned git
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# commit, it is now required to give Kbuild relative paths along-with the
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# object name (CFLAGS_<somepath>/somefile.o>). As a result, CFLAGS_$(object)
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# is set twice, once with a relative path to the object files and once with
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# just the object files.
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#
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ASSIGN_PER_OBJ_CFLAGS = \
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$(foreach _cflags_variable, \
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$(notdir $(1)) $(1), \
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$(eval $(addprefix CFLAGS_,$(_cflags_variable)) += $(2)))
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#
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# Include the specifics of the individual NVIDIA kernel modules.
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#
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# Each of these should:
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# - Append to 'obj-m', to indicate the kernel module that should be built.
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# - Define the object files that should get built to produce the kernel module.
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# - Tie into conftest (see the description below).
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#
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NV_UNDEF_BEHAVIOR_SANITIZER ?=
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ifeq ($(NV_UNDEF_BEHAVIOR_SANITIZER),1)
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UBSAN_SANITIZE := y
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endif
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$(foreach _module, $(NV_KERNEL_MODULES), \
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$(eval include $(src)/$(_module)/$(_module).Kbuild))
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#
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# Define CFLAGS that apply to all the NVIDIA kernel modules. EXTRA_CFLAGS
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# is deprecated since 2.6.24 in favor of ccflags-y, but we need to support
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# older kernels which do not have ccflags-y. Newer kernels append
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# $(EXTRA_CFLAGS) to ccflags-y for compatibility.
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#
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EXTRA_CFLAGS += -I$(src)/common/inc
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EXTRA_CFLAGS += -I$(src)
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EXTRA_CFLAGS += -Wall $(DEFINES) $(INCLUDES) -Wno-cast-qual -Wno-format-extra-args
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EXTRA_CFLAGS += -D__KERNEL__ -DMODULE -DNVRM
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EXTRA_CFLAGS += -DNV_VERSION_STRING=\"550.127.05\"
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ifneq ($(SYSSRCHOST1X),)
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EXTRA_CFLAGS += -I$(SYSSRCHOST1X)
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endif
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# Some Android kernels prohibit driver use of filesystem functions like
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# filp_open() and kernel_read(). Disable the NV_FILESYSTEM_ACCESS_AVAILABLE
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# functionality that uses those functions when building for Android.
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PLATFORM_IS_ANDROID ?= 0
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ifeq ($(PLATFORM_IS_ANDROID),1)
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EXTRA_CFLAGS += -DNV_FILESYSTEM_ACCESS_AVAILABLE=0
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else
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EXTRA_CFLAGS += -DNV_FILESYSTEM_ACCESS_AVAILABLE=1
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endif
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EXTRA_CFLAGS += -Wno-unused-function
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ifneq ($(NV_BUILD_TYPE),debug)
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EXTRA_CFLAGS += -Wuninitialized
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endif
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EXTRA_CFLAGS += -fno-strict-aliasing
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ifeq ($(ARCH),arm64)
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EXTRA_CFLAGS += -mstrict-align
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endif
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ifeq ($(NV_BUILD_TYPE),debug)
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EXTRA_CFLAGS += -g
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endif
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EXTRA_CFLAGS += -ffreestanding
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ifeq ($(ARCH),arm64)
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EXTRA_CFLAGS += -mgeneral-regs-only -march=armv8-a
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EXTRA_CFLAGS += $(call cc-option,-mno-outline-atomics,)
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endif
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ifeq ($(ARCH),x86_64)
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EXTRA_CFLAGS += -mno-red-zone -mcmodel=kernel
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endif
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ifeq ($(ARCH),powerpc)
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EXTRA_CFLAGS += -mlittle-endian -mno-strict-align -mno-altivec
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endif
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EXTRA_CFLAGS += -DNV_UVM_ENABLE
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EXTRA_CFLAGS += $(call cc-option,-Werror=undef,)
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EXTRA_CFLAGS += -DNV_SPECTRE_V2=$(NV_SPECTRE_V2)
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EXTRA_CFLAGS += -DNV_KERNEL_INTERFACE_LAYER
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#
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# Detect SGI UV systems and apply system-specific optimizations.
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#
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ifneq ($(wildcard /proc/sgi_uv),)
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EXTRA_CFLAGS += -DNV_CONFIG_X86_UV
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endif
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ifdef VGX_FORCE_VFIO_PCI_CORE
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EXTRA_CFLAGS += -DNV_VGPU_FORCE_VFIO_PCI_CORE
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endif
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WARNINGS_AS_ERRORS ?=
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ifeq ($(WARNINGS_AS_ERRORS),1)
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ccflags-y += -Werror
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else
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ccflags-y += -Wno-error
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endif
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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_CFLAGS += $(call cc-disable-warning,pointer-sign)
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NV_CONFTEST_CFLAGS += $(call cc-option,-fshort-wchar,)
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NV_CONFTEST_CFLAGS += -Wno-error
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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 += $(NV_CONFTEST_COMPILE_TEST_HEADERS)
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#
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# Generate a header file for a single conftest compile test. Each compile test
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# header depends on conftest.sh, as well as the generated conftest/headers.h
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# file, which is included in the compile test preamble.
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#
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$(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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include $(src)/header-presence-tests.mk
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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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dom0_sanity_check \
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xen_sanity_check \
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preempt_rt_sanity_check \
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vgpu_kvm_sanity_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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