Commit 65637901 authored by Lorenzo Pieralisi's avatar Lorenzo Pieralisi
Browse files

ACPI/IORT: Enable SMMUv3/PMCG IORT MSI domain set-up 



ITS specific mappings for SMMUv3/PMCG components can be retrieved
through special index mapping entries introduced in IORT revision C.

Introduce a new API iort_set_device_domain() to set the MSI domain for
SMMUv3/PMCG nodes (extendable to any future IORT node requiring special
index ITS mapping entries) that represent MSI through special index
mappings in order to enable MSI support for the devices their nodes
represent.

Signed-off-by: default avatarLorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: default avatarHanjun Guo <hanjun.guo@linaro.org>
parent 86456a3f

drivers/acpi/arm64/iort.c

+45 −0
Original line number Diff line number Diff line
@@ -638,6 +638,49 @@ struct irq_domain *iort_get_device_domain(struct device *dev, u32 req_id) 
	return irq_find_matching_fwnode(handle, DOMAIN_BUS_PCI_MSI);

}



static void iort_set_device_domain(struct device *dev,

				   struct acpi_iort_node *node)

{

	struct acpi_iort_its_group *its;

	struct acpi_iort_node *msi_parent;

	struct acpi_iort_id_mapping *map;

	struct fwnode_handle *iort_fwnode;

	struct irq_domain *domain;

	int index;



	index = iort_get_id_mapping_index(node);

	if (index < 0)

		return;



	map = ACPI_ADD_PTR(struct acpi_iort_id_mapping, node,

			   node->mapping_offset + index * sizeof(*map));



	/* Firmware bug! */

	if (!map->output_reference ||

	    !(map->flags & ACPI_IORT_ID_SINGLE_MAPPING)) {

		pr_err(FW_BUG "[node %p type %d] Invalid MSI mapping\n",

		       node, node->type);

		return;

	}



	msi_parent = ACPI_ADD_PTR(struct acpi_iort_node, iort_table,

				  map->output_reference);



	if (!msi_parent || msi_parent->type != ACPI_IORT_NODE_ITS_GROUP)

		return;



	/* Move to ITS specific data */

	its = (struct acpi_iort_its_group *)msi_parent->node_data;



	iort_fwnode = iort_find_domain_token(its->identifiers[0]);

	if (!iort_fwnode)

		return;



	domain = irq_find_matching_fwnode(iort_fwnode, DOMAIN_BUS_PLATFORM_MSI);

	if (domain)

		dev_set_msi_domain(dev, domain);

}



/**

 * iort_get_platform_device_domain() - Find MSI domain related to a

 * platform device
@@ -1261,6 +1304,8 @@ static int __init iort_add_platform_device(struct acpi_iort_node *node, 
	/* Configure DMA for the page table walker */

	acpi_dma_configure(&pdev->dev, attr);



	iort_set_device_domain(&pdev->dev, node);



	ret = platform_device_add(pdev);

	if (ret)

		goto dma_deconfigure;

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