ACPI/IORT: Add node match function (bdca0c07) · Commits · 戴 / test

Device drivers (eg ARM SMMU) need to know if a specific component is part of the IORT table, so that kernel data structures are not initialized at initcalls time if the respective component is not part of the IORT table. To this end, this patch adds a trivial function that allows detecting if a given IORT node type is present or not in the ACPI table, providing an ACPI IORT equivalent for of_find_matching_node(). Signed-off-by:

Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Reviewed-by:

Tomasz Nowicki <tn@semihalf.com> Tested-by:

Hanjun Guo <hanjun.guo@linaro.org> Tested-by:

Tomasz Nowicki <tn@semihalf.com> Acked-by:

Hanjun Guo <hanjun.guo@linaro.org> Cc: Hanjun Guo <hanjun.guo@linaro.org> Cc: Tomasz Nowicki <tn@semihalf.com> Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net> Signed-off-by:

Will Deacon <will.deacon@arm.com>

drivers/acpi/arm64/iort.c

+15 −0

Original line number	Diff line number	Diff line
		@@ -227,6 +227,21 @@ static struct acpi_iort_node *iort_scan_node(enum acpi_iort_node_type type,
		return NULL;
		}

		static acpi_status
		iort_match_type_callback(struct acpi_iort_node node, void context)
		{
		return AE_OK;
		}

		bool iort_node_match(u8 type)
		{
		struct acpi_iort_node *node;

		node = iort_scan_node(type, iort_match_type_callback, NULL);

		return node != NULL;
		}

		static acpi_status iort_match_node_callback(struct acpi_iort_node *node,
		void *context)
		{

include/linux/acpi_iort.h

+2 −0

Original line number	Diff line number	Diff line
		@@ -28,10 +28,12 @@ void iort_deregister_domain_token(int trans_id);
		struct fwnode_handle *iort_find_domain_token(int trans_id);
		#ifdef CONFIG_ACPI_IORT
		void acpi_iort_init(void);
		bool iort_node_match(u8 type);
		u32 iort_msi_map_rid(struct device *dev, u32 req_id);
		struct irq_domain iort_get_device_domain(struct device dev, u32 req_id);
		#else
		static inline void acpi_iort_init(void) { }
		static inline bool iort_node_match(u8 type) { return false; }
		static inline u32 iort_msi_map_rid(struct device *dev, u32 req_id)
		{ return req_id; }
		static inline struct irq_domain iort_get_device_domain(struct device dev,

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