ACPI: platform-msi: retrieve devid from IORT (ae7c1838) · Commits · 戴 / test

For devices connecting to an ITS, the devices need to identify themself through a devid; this devid is represented in the IORT table in named component node [1] for platform devices, so this patch adds code that scans the IORT table to retrieve the devices devid. Add an IORT interface to collect ITS devices devid to carry out platform devices MSI mappings with IORT tables. [1]: https://static.docs.arm.com/den0049/b/DEN0049B_IO_Remapping_Table.pdf Signed-off-by:

Hanjun Guo <hanjun.guo@linaro.org> [lorenzo.pieralisi@arm.com: rewrote commit log/dropped ITS changes] Signed-off-by:

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

Ming Lei <ming.lei@canonical.com> Tested-by:

Wei Xu <xuwei5@hisilicon.com> Tested-by:

Sinan Kaya <okaya@codeaurora.org> Cc: Marc Zyngier <marc.zyngier@arm.com> Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Cc: Tomasz Nowicki <tn@semihalf.com> Cc: Thomas Gleixner <tglx@linutronix.de>

drivers/acpi/arm64/iort.c

+24 −0

Original line number	Diff line number	Diff line
		@@ -467,6 +467,30 @@ u32 iort_msi_map_rid(struct device *dev, u32 req_id)
		return dev_id;
		}

		/**
		* iort_pmsi_get_dev_id() - Get the device id for a device
		* @dev: The device for which the mapping is to be done.
		* @dev_id: The device ID found.
		*
		* Returns: 0 for successful find a dev id, -ENODEV on error
		*/
		int iort_pmsi_get_dev_id(struct device dev, u32 dev_id)
		{
		int i;
		struct acpi_iort_node *node;

		node = iort_find_dev_node(dev);
		if (!node)
		return -ENODEV;

		for (i = 0; i < node->mapping_count; i++) {
		if (iort_node_map_platform_id(node, dev_id, IORT_MSI_TYPE, i))
		return 0;
		}

		return -ENODEV;
		}

		/**
		* iort_dev_find_its_id() - Find the ITS identifier for a device
		* @dev: The device.

include/linux/acpi_iort.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -34,6 +34,7 @@ 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);
		int iort_pmsi_get_dev_id(struct device dev, u32 dev_id);
		/* IOMMU interface */
		void iort_set_dma_mask(struct device *dev);
		const struct iommu_ops iort_iommu_configure(struct device dev);

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