# SPDX-License-Identifier: GPL-2.0-only

# When the make command line has the goal 'all' or no goal specified (i.e.
# when compiling the driver) a sub-make of the kernel's Makefile includes
# the kernel configuration (include/config/auto.conf), but if any other
# goal is specified (e.g. install) the kernel configuration does not get
# included.  Set a variable and export it to track over sub-makes.
ifeq ($(MAKELEVEL),0)
  ifeq ($(filter-out all, $(MAKECMDGOALS)),)
    export KERNEL_CONFIG_INCLUDED=1
  endif
endif

# Explicitly set shell to bash, to avoid issues on distros with a different
# default shell. Looking at you, Ubuntu.
SHELL=/bin/bash

COMMON_MK ?= $(wildcard $(src)/common.mk)
ifeq (${COMMON_MK},)
  override src = .
  COMMON_MK = $(wildcard $(src)/common.mk)
endif
ifeq (${COMMON_MK},)
  $(error Cannot find common.mk build rules)
else
  include ${COMMON_MK}
endif

# SIOV support is only supported if the kernel has features for controlling
# PASID support. Do not even try to build SIOV support if the kernel lacks
# the necessary infrastructure.
ifeq ($(call is_kcompat_defined,HAVE_PASID_SUPPORT),1)
ifeq ($(call is_kcompat_defined,HAVE_IOMMU_DEV_FEAT_AUX),1)
export ENABLE_SIOV_SUPPORT := 1
endif
endif

# LM support is only enabled if the kernel has features for LM v1 protocol.
# If the kernel lacks the necessary infrastructure, LM support will be disabled.
ifeq ($(call is_kcompat_defined,HAVE_LMV1_SUPPORT),1)
export ENABLE_LM_SUPPORT := 1
endif

ifneq ($(KERNELRELEASE),)
# kbuild part of makefile
#
ccflags-y += -I$(src)
subdir-ccflags-y += -I$(src)

obj-m += crete_vdpa.o

crete_vdpa-y := crete_vdpa_main.o \
	 crete_vdpa_dev.o	\


else	# ifneq($(KERNELRELEASE),)
# normal makefile

DRIVER := crete_vdpa
EXTRA_CFLAGS += -std=gnu11

# ice does not support building on kernels older than 3.10.0
$(call minimum_kver_check,3,10,0)

# Command to update initramfs or display a warning message
ifeq (${cmd_initrd},)
define cmd_initramfs
@echo "Unable to update initramfs. You may need to do this manually."
endef
else
define cmd_initramfs
@echo "Updating initramfs..."
$(call cmd_initrd)
endef
endif

all:
	+$(call kernelbuild,modules)
	#@gzip -c ../${DRIVER}.${MANSECTION} > ${DRIVER}.${MANSECTION}.gz
ifneq ($(wildcard lttng),)
	$(MAKE) -C lttng
endif

clean:
	+$(call kernelbuild,clean)
	@-rm -rf *.${MANSECTION}.gz *.ko
ifneq ($(wildcard lttng),)
	$(MAKE) -C lttng clean
endif

# Install kernel module files. This target is called by the RPM specfile when
# generating binary RPMs, and is not expected to modify files outside of the
# build root. Thus, it must not update initramfs, or run depmod.
modules_install: all
	+$(call kernelbuild,modules_install)
#$(MAKE) auxiliary_install

# Install kernel module files without auxiliary. This target is called by the
# RPM specfile when  generating binary RPMs, and is not expected to modify
# files outside of the build root. Thus, it must not update initramfs, or run depmod.
modules_install_no_aux:
	@+$(call kernelbuild,modules_install)

mandocs_install: all
	install -D -m 644 ${DRIVER}.${MANSECTION}.gz ${INSTALL_MOD_PATH}/${MANDIR}/man${MANSECTION}/${DRIVER}.${MANSECTION}.gz

# After installing all the files, perform necessary work to ensure the system
# will use the new modules. This includes running depmod to update module
# dependencies and updating the initramfs image in case the module is loaded
# during early boot.
install: modules_install
	$(call cmd_depmod)
	$(call cmd_initramfs)

# Remove installed module files. This target is called by the RPM specfile when
# generating binary RPMs, and is not expected to modify files outside of the
# build root. Thus, it must not update the initramfs image or run depmod.
modules_uninstall:
	rm -f ${INSTALL_MOD_PATH}/lib/modules/${KVER}/${INSTALL_MOD_DIR}/${DRIVER}.ko
	#$(MAKE) auxiliary_uninstall

mandocs_uninstall:
	rm -f ${INSTALL_MOD_PATH}/${MANDIR}/man${MANSECTION}/${DRIVER}.${MANSECTION}.gz 2>/dev/null

# After uninstalling all the files, perform necessary work to restore the
# system back to using the default kernel modules. This includes running depmod
# to update module dependencies and updating the initramfs image.
uninstall: modules_uninstall
	$(call cmd_depmod)
	$(call cmd_initramfs)

#auxiliary_info:
#	@../scripts/check_aux_bus --verbose --ksrc="${KSRC}" --build-kernel="${BUILD_KERNEL}"

#auxiliary_install:
#	${auxiliary_post_install}

#auxiliary_uninstall:
#	${auxiliary_post_uninstall}

#ifeq (${NEED_AUX_BUS},1)
#all: auxiliary_info
#endif

help:
	@echo 'Building external (out-of-tree) modules:'
	@echo '  all               - default target, build the module(s) and manpage'
	@echo '  clean             - remove generated files'
	@echo '  modules_install   - install the module(s) only'
	@echo '  install           - install the module(s) and manpage, and update initramfs'
	@echo '  modules_uninstall - uninstall the module(s) only'
	@echo '  uninstall         - uninstall the module(s) and manpage, and update initramfs'
	@echo ''
	@echo 'Command-line options:'
	@echo '  KSRC=<path>     - Path to kernel source (defaults to running kernel)'
	@echo '  LINUX_VERSION=<x.y.z> - Debug tool to force kernel LINUX_VERSION_CODE for'
	@echo '                          external module(s). *** Use at your own risk! ***'
	@echo '  INSTALL_MOD_PATH=<path> - Prefix added to default module(s) installation path'
	@echo '                            (/lib/modules/$$(KERNELRELEASE)/)'
	@echo '  INSTALL_MOD_DIR=<path> - Install module(s) in subdirectory other than default'
	@echo '                           (.../updates/drivers/net/ethernet/jm/${DRIVER}/)'
	@echo ''

.PHONY: all clean modules_install install modules_uninstall uninstall help

endif	# ifneq($(KERNELRELEASE),)