open-gpu-kernel-modules/kernel-open/Kbuild

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###########################################################################
# Kbuild file for NVIDIA Linux GPU driver kernel modules
###########################################################################
#
# The parent makefile is expected to define:
#
# NV_KERNEL_SOURCES : The root of the kernel source tree.
# NV_KERNEL_OUTPUT : The kernel's output tree.
# NV_KERNEL_MODULES : A whitespace-separated list of modules to build.
# ARCH : The target CPU architecture: x86_64|arm64|powerpc
#
# Kbuild provides the variables:
#
# $(src) : The directory containing this Kbuild file.
# $(obj) : The directory where the output from this build is written.
#
NV_BUILD_TYPE ?= release
#
# Utility macro ASSIGN_PER_OBJ_CFLAGS: to control CFLAGS on a
# per-object basis, Kbuild honors the 'CFLAGS_$(object)' variable.
# E.g., "CFLAGS_nv.o" for CFLAGS that are specific to nv.o. Use this
# macro to assign 'CFLAGS_$(object)' variables for multiple object
# files.
#
# $(1): The object files.
# $(2): The CFLAGS to add for those object files.
#
# With kernel git commit 54b8ae66ae1a3454a7645d159a482c31cd89ab33, the
# handling of object-specific CFLAGs, CFLAGS_$(object) has changed. Prior to
# this commit, the CFLAGS_$(object) variable was required to be defined with
# only the the object name (<CFLAGS_somefile.o>). With the aforementioned git
# commit, it is now required to give Kbuild relative paths along-with the
# object name (CFLAGS_<somepath>/somefile.o>). As a result, CFLAGS_$(object)
# is set twice, once with a relative path to the object files and once with
# just the object files.
#
ASSIGN_PER_OBJ_CFLAGS = \
$(foreach _cflags_variable, \
$(notdir $(1)) $(1), \
$(eval $(addprefix CFLAGS_,$(_cflags_variable)) += $(2)))
#
# Include the specifics of the individual NVIDIA kernel modules.
#
# Each of these should:
# - Append to 'obj-m', to indicate the kernel module that should be built.
# - Define the object files that should get built to produce the kernel module.
# - Tie into conftest (see the description below).
#
NV_UNDEF_BEHAVIOR_SANITIZER ?=
ifeq ($(NV_UNDEF_BEHAVIOR_SANITIZER),1)
UBSAN_SANITIZE := y
endif
$(foreach _module, $(NV_KERNEL_MODULES), \
$(eval include $(src)/$(_module)/$(_module).Kbuild))
#
# Define CFLAGS that apply to all the NVIDIA kernel modules. EXTRA_CFLAGS
# is deprecated since 2.6.24 in favor of ccflags-y, but we need to support
# older kernels which do not have ccflags-y. Newer kernels append
# $(EXTRA_CFLAGS) to ccflags-y for compatibility.
#
EXTRA_CFLAGS += -I$(src)/common/inc
EXTRA_CFLAGS += -I$(src)
EXTRA_CFLAGS += -Wall -MD $(DEFINES) $(INCLUDES) -Wno-cast-qual -Wno-error -Wno-format-extra-args
EXTRA_CFLAGS += -D__KERNEL__ -DMODULE -DNVRM
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EXTRA_CFLAGS += -DNV_VERSION_STRING=\"515.65.01\"
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EXTRA_CFLAGS += -Wno-unused-function
ifneq ($(NV_BUILD_TYPE),debug)
EXTRA_CFLAGS += -Wuninitialized
endif
EXTRA_CFLAGS += -fno-strict-aliasing
ifeq ($(ARCH),arm64)
EXTRA_CFLAGS += -mstrict-align
endif
ifeq ($(NV_BUILD_TYPE),debug)
EXTRA_CFLAGS += -g -gsplit-dwarf
endif
EXTRA_CFLAGS += -ffreestanding
ifeq ($(ARCH),arm64)
EXTRA_CFLAGS += -mgeneral-regs-only -march=armv8-a
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EXTRA_CFLAGS += $(call cc-option,-mno-outline-atomics,)
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endif
ifeq ($(ARCH),x86_64)
EXTRA_CFLAGS += -mno-red-zone -mcmodel=kernel
endif
ifeq ($(ARCH),powerpc)
EXTRA_CFLAGS += -mlittle-endian -mno-strict-align -mno-altivec
endif
EXTRA_CFLAGS += -DNV_UVM_ENABLE
EXTRA_CFLAGS += $(call cc-option,-Werror=undef,)
EXTRA_CFLAGS += -DNV_SPECTRE_V2=$(NV_SPECTRE_V2)
EXTRA_CFLAGS += -DNV_KERNEL_INTERFACE_LAYER
#
# Detect SGI UV systems and apply system-specific optimizations.
#
ifneq ($(wildcard /proc/sgi_uv),)
EXTRA_CFLAGS += -DNV_CONFIG_X86_UV
endif
#
# The conftest.sh script tests various aspects of the target kernel.
# The per-module Kbuild files included above should:
#
# - Append to the NV_CONFTEST_*_COMPILE_TESTS variables to indicate
# which conftests they require.
# - Append to the NV_OBJECTS_DEPEND_ON_CONFTEST variable any object files
# that depend on conftest.
#
# The conftest machinery below will run the requested tests and
# generate the appropriate header files.
#
CC ?= cc
LD ?= ld
NV_CONFTEST_SCRIPT := $(src)/conftest.sh
NV_CONFTEST_HEADER := $(obj)/conftest/headers.h
NV_CONFTEST_CMD := /bin/sh $(NV_CONFTEST_SCRIPT) \
"$(CC)" $(ARCH) $(NV_KERNEL_SOURCES) $(NV_KERNEL_OUTPUT)
NV_CFLAGS_FROM_CONFTEST := $(shell $(NV_CONFTEST_CMD) build_cflags)
NV_CONFTEST_CFLAGS = $(NV_CFLAGS_FROM_CONFTEST) $(EXTRA_CFLAGS) -fno-pie
NV_CONFTEST_COMPILE_TEST_HEADERS := $(obj)/conftest/macros.h
NV_CONFTEST_COMPILE_TEST_HEADERS += $(obj)/conftest/functions.h
NV_CONFTEST_COMPILE_TEST_HEADERS += $(obj)/conftest/symbols.h
NV_CONFTEST_COMPILE_TEST_HEADERS += $(obj)/conftest/types.h
NV_CONFTEST_COMPILE_TEST_HEADERS += $(obj)/conftest/generic.h
NV_CONFTEST_HEADERS := $(obj)/conftest/patches.h
NV_CONFTEST_HEADERS += $(obj)/conftest/headers.h
NV_CONFTEST_HEADERS += $(NV_CONFTEST_COMPILE_TEST_HEADERS)
#
# Generate a header file for a single conftest compile test. Each compile test
# header depends on conftest.sh, as well as the generated conftest/headers.h
# file, which is included in the compile test preamble.
#
$(obj)/conftest/compile-tests/%.h: $(NV_CONFTEST_SCRIPT) $(NV_CONFTEST_HEADER)
@mkdir -p $(obj)/conftest/compile-tests
@echo " CONFTEST: $(notdir $*)"
@$(NV_CONFTEST_CMD) compile_tests '$(NV_CONFTEST_CFLAGS)' \
$(notdir $*) > $@
#
# Concatenate a conftest/*.h header from its constituent compile test headers
#
# $(1): The name of the concatenated header
# $(2): The list of compile tests that make up the header
#
define NV_GENERATE_COMPILE_TEST_HEADER
$(obj)/conftest/$(1).h: $(addprefix $(obj)/conftest/compile-tests/,$(addsuffix .h,$(2)))
@mkdir -p $(obj)/conftest
@# concatenate /dev/null to prevent cat from hanging when $$^ is empty
@cat $$^ /dev/null > $$@
endef
#
# Generate the conftest compile test headers from the lists of compile tests
# provided by the module-specific Kbuild files.
#
NV_CONFTEST_FUNCTION_COMPILE_TESTS ?=
NV_CONFTEST_GENERIC_COMPILE_TESTS ?=
NV_CONFTEST_MACRO_COMPILE_TESTS ?=
NV_CONFTEST_SYMBOL_COMPILE_TESTS ?=
NV_CONFTEST_TYPE_COMPILE_TESTS ?=
$(eval $(call NV_GENERATE_COMPILE_TEST_HEADER,functions,$(NV_CONFTEST_FUNCTION_COMPILE_TESTS)))
$(eval $(call NV_GENERATE_COMPILE_TEST_HEADER,generic,$(NV_CONFTEST_GENERIC_COMPILE_TESTS)))
$(eval $(call NV_GENERATE_COMPILE_TEST_HEADER,macros,$(NV_CONFTEST_MACRO_COMPILE_TESTS)))
$(eval $(call NV_GENERATE_COMPILE_TEST_HEADER,symbols,$(NV_CONFTEST_SYMBOL_COMPILE_TESTS)))
$(eval $(call NV_GENERATE_COMPILE_TEST_HEADER,types,$(NV_CONFTEST_TYPE_COMPILE_TESTS)))
$(obj)/conftest/patches.h: $(NV_CONFTEST_SCRIPT)
@mkdir -p $(obj)/conftest
@$(NV_CONFTEST_CMD) patch_check > $@
$(obj)/conftest/headers.h: $(NV_CONFTEST_SCRIPT)
@mkdir -p $(obj)/conftest
@$(NV_CONFTEST_CMD) test_kernel_headers '$(NV_CONFTEST_CFLAGS)' > $@
clean-dirs := $(obj)/conftest
# For any object files that depend on conftest, declare the dependency here.
$(addprefix $(obj)/,$(NV_OBJECTS_DEPEND_ON_CONFTEST)): | $(NV_CONFTEST_HEADERS)
# Sanity checks of the build environment and target system/kernel
BUILD_SANITY_CHECKS = \
cc_sanity_check \
cc_version_check \
dom0_sanity_check \
xen_sanity_check \
preempt_rt_sanity_check \
vgpu_kvm_sanity_check \
module_symvers_sanity_check
.PHONY: $(BUILD_SANITY_CHECKS)
$(BUILD_SANITY_CHECKS):
@$(NV_CONFTEST_CMD) $@ full_output
# Perform all sanity checks before generating the conftest headers
$(NV_CONFTEST_HEADERS): | $(BUILD_SANITY_CHECKS)
# Make the conftest headers depend on the kernel version string
$(obj)/conftest/uts_release: NV_GENERATE_UTS_RELEASE
@mkdir -p $(dir $@)
@NV_UTS_RELEASE="// Kernel version: `$(NV_CONFTEST_CMD) compile_tests '$(NV_CONFTEST_CFLAGS)' uts_release`"; \
if ! [ -f "$@" ] || [ "$$NV_UTS_RELEASE" != "`cat $@`" ]; \
then echo "$$NV_UTS_RELEASE" > $@; fi
.PHONY: NV_GENERATE_UTS_RELEASE
$(NV_CONFTEST_HEADERS): $(obj)/conftest/uts_release