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Commitaab94339cd("of: Add support for linking device tree blobs into vmlinux") introduced a mechanism to embed DTBs into vmlinux. Initially, it was used for wrapping boot DTBs in arch/*/boot/dts/, but it is now reused for more generic purposes, such as testing. Built-in DTBs are discarded because KERNEL_DTB() is part of INIT_DATA, as defined in include/asm-generic/vmlinux.lds.h. This has not been an issue so far because OF unittests are triggered during boot, as defined by late_initcall(of_unittest). However, the recent clk KUnit test additions have caused problems because KUnit can execute test suites after boot. For example: # echo > /sys/kernel/debug/kunit/clk_register_clk_parent_data_device/run This command triggers a stack trace because built-in DTBs have already been freed. While it is possible to move such test suites from kunit_test_suites to kunit_test_init_section_suites, it would be preferable to avoid usage limitations. This commit moves non-boot built-in DTBs to the .rodata section. Since these generic DTBs are looked up by name, they do not need to be placed in the special .dtb.init.rodata section. Boot DTBs should remain in .dtb.init.rodata because the arch boot code generally does not know the DT name, thus it uses the __dtb_start symbol to locate it. This separation also ensures that the __dtb_start symbol references the boot DTB. Currently, the .dtb.init.rodata is a mixture of both boot and non-boot DTBs. The __dtb_start symbol must be followed by the boot DTB, but we currently rely on the link order (i.e., the order in Makefiles), which is very fragile. The implementation is kind of cheesy; the section is .dtb.init.rodata when $(obj) starts with arch/$(SRCARCH)/boot/dts, and .rodata section otherwise. This will be refactored later. Fixes:5c9dd72d83("of: Add a KUnit test for overlays and test managed APIs") Fixes:5776526beb("clk: Add KUnit tests for clk fixed rate basic type") Fixes:274aff8711("clk: Add KUnit tests for clks registered with struct clk_parent_data") Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> Acked-by: Rob Herring (Arm) <robh@kernel.org>
145 lines
4.9 KiB
Makefile
145 lines
4.9 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0-only
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# If CONFIG_OF_ALL_DTBS is enabled, all DT blobs are built
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dtb-$(CONFIG_OF_ALL_DTBS) += $(dtb-)
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# Composite DTB (i.e. DTB constructed by overlay)
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multi-dtb-y := $(call multi-search, $(dtb-y), .dtb, -dtbs)
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# Primitive DTB compiled from *.dts
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real-dtb-y := $(call real-search, $(dtb-y), .dtb, -dtbs)
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# Base DTB that overlay is applied onto
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base-dtb-y := $(filter %.dtb, $(call real-search, $(multi-dtb-y), .dtb, -dtbs))
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dtb-y := $(addprefix $(obj)/, $(dtb-y))
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multi-dtb-y := $(addprefix $(obj)/, $(multi-dtb-y))
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real-dtb-y := $(addprefix $(obj)/, $(real-dtb-y))
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always-y += $(dtb-y)
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targets += $(real-dtb-y)
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# dtbs-list
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# ---------------------------------------------------------------------------
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ifdef need-dtbslist
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subdir-dtbslist := $(addsuffix /dtbs-list, $(subdir-ym))
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dtb-y += $(subdir-dtbslist)
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always-y += $(obj)/dtbs-list
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endif
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$(subdir-dtbslist): $(obj)/%/dtbs-list: $(obj)/% ;
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$(obj)/dtbs-list: $(dtb-y) FORCE
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$(call if_changed,gen_order)
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# Assembly file to wrap dtb(o)
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# ---------------------------------------------------------------------------
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builtin-dtb-section = $(if $(filter arch/$(SRCARCH)/boot/dts%, $(obj)),.dtb.init.rodata,.rodata)
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# Generate an assembly file to wrap the output of the device tree compiler
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quiet_cmd_wrap_S_dtb = WRAP $@
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cmd_wrap_S_dtb = { \
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symbase=__$(patsubst .%,%,$(suffix $<))_$(subst -,_,$(notdir $*)); \
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echo '\#include <asm-generic/vmlinux.lds.h>'; \
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echo '.section $(builtin-dtb-section),"a"'; \
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echo '.balign STRUCT_ALIGNMENT'; \
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echo ".global $${symbase}_begin"; \
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echo "$${symbase}_begin:"; \
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echo '.incbin "$<" '; \
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echo ".global $${symbase}_end"; \
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echo "$${symbase}_end:"; \
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echo '.balign STRUCT_ALIGNMENT'; \
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} > $@
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$(obj)/%.dtb.S: $(obj)/%.dtb FORCE
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$(call if_changed,wrap_S_dtb)
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$(obj)/%.dtbo.S: $(obj)/%.dtbo FORCE
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$(call if_changed,wrap_S_dtb)
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# Schema check
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# ---------------------------------------------------------------------------
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ifneq ($(CHECK_DTBS),)
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DT_CHECKER ?= dt-validate
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DT_CHECKER_FLAGS ?= $(if $(DT_SCHEMA_FILES),-l $(DT_SCHEMA_FILES),-m)
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DT_BINDING_DIR := Documentation/devicetree/bindings
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DT_TMP_SCHEMA := $(objtree)/$(DT_BINDING_DIR)/processed-schema.json
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dtb-check-enabled = $(if $(filter %.dtb, $@),y)
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endif
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quiet_dtb_check_tag = $(if $(dtb-check-enabled),[C], )
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cmd_dtb_check = $(if $(dtb-check-enabled),; $(DT_CHECKER) $(DT_CHECKER_FLAGS) -u $(srctree)/$(DT_BINDING_DIR) -p $(DT_TMP_SCHEMA) $@ || true)
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# Overlay
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# ---------------------------------------------------------------------------
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# NOTE:
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# Do not replace $(filter %.dtb %.dtbo, $^) with $(real-prereqs). When a single
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# DTB is turned into a multi-blob DTB, $^ will contain header file dependencies
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# recorded in the .*.cmd file.
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quiet_cmd_fdtoverlay = OVL $(quiet_dtb_check_tag) $@
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cmd_fdtoverlay = $(objtree)/scripts/dtc/fdtoverlay -o $@ -i $(filter %.dtb %.dtbo, $^) $(cmd_dtb_check)
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$(multi-dtb-y): $(DT_TMP_SCHEMA) FORCE
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$(call if_changed,fdtoverlay)
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$(call multi_depend, $(multi-dtb-y), .dtb, -dtbs)
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# DTC
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# ---------------------------------------------------------------------------
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DTC ?= $(objtree)/scripts/dtc/dtc
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DTC_FLAGS += -Wno-unique_unit_address
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# Disable noisy checks by default
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ifeq ($(findstring 1,$(KBUILD_EXTRA_WARN)),)
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DTC_FLAGS += -Wno-unit_address_vs_reg \
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-Wno-avoid_unnecessary_addr_size \
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-Wno-alias_paths \
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-Wno-graph_child_address \
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-Wno-simple_bus_reg
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else
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DTC_FLAGS += -Wunique_unit_address_if_enabled
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endif
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ifneq ($(findstring 2,$(KBUILD_EXTRA_WARN)),)
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DTC_FLAGS += -Wnode_name_chars_strict \
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-Wproperty_name_chars_strict \
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-Wunique_unit_address
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endif
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DTC_FLAGS += $(DTC_FLAGS_$(target-stem))
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# Set -@ if the target is a base DTB that overlay is applied onto
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DTC_FLAGS += $(if $(filter $(patsubst $(obj)/%,%,$@), $(base-dtb-y)), -@)
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DTC_INCLUDE := $(srctree)/scripts/dtc/include-prefixes
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dtc_cpp_flags = -Wp,-MMD,$(depfile).pre.tmp -nostdinc -I $(DTC_INCLUDE) -undef -D__DTS__
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dtc-tmp = $(subst $(comma),_,$(dot-target).dts.tmp)
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quiet_cmd_dtc = DTC $(quiet_dtb_check_tag) $@
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cmd_dtc = \
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$(HOSTCC) -E $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \
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$(DTC) -o $@ -b 0 $(addprefix -i,$(dir $<) $(DTC_INCLUDE)) \
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$(DTC_FLAGS) -d $(depfile).dtc.tmp $(dtc-tmp) ; \
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cat $(depfile).pre.tmp $(depfile).dtc.tmp > $(depfile) \
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$(cmd_dtb_check)
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$(obj)/%.dtb: $(obj)/%.dts $(DTC) $(DT_TMP_SCHEMA) FORCE
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$(call if_changed_dep,dtc)
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$(obj)/%.dtbo: $(src)/%.dtso $(DTC) FORCE
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$(call if_changed_dep,dtc)
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# targets
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# ---------------------------------------------------------------------------
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targets += $(always-y)
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# %.dtb.o <- %.dtb.S <- %.dtb <- %.dts
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# %.dtbo.o <- %.dtbo.S <- %.dtbo <- %.dtso
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targets += $(call intermediate_targets, .dtb.o, .dtb.S .dtb) \
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$(call intermediate_targets, .dtbo.o, .dtbo.S .dtbo)
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