From: Lorenzo Pieralisi <lorenzo.pieralisi@xxxxxxx>
Since we make single mappings valid for SMMUv3 (and PMCG), also
we have a mapping index for SMMUv3 MSI, we can directly use that
index to get the map entry, then retrieve ITS parent to add SMMUv3
MSI support.
Introduce a new API iort_set_device_domain() to find the MSI domain
for an SMMUv3 (or any other IORT table node) to reduce the complex
of doing that via acpi_configure_pmsi_domain().
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@xxxxxxx>
Signed-off-by: Hanjun Guo <hanjun.guo@xxxxxxxxxx>
---
drivers/acpi/arm64/iort.c | 45 +++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 45 insertions(+)
diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c
index 1c1160e..06b38de 100644
--- a/drivers/acpi/arm64/iort.c
+++ b/drivers/acpi/arm64/iort.c
@@ -633,6 +633,49 @@ 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
@@ -1259,6 +1302,8 @@ static int __init iort_add_smmu_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;
--
1.9.1
--
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