[RFC PATCH 4/4] ACPI: IORT: Add SMMUv3 MSI support

[Hanjun Guo <guohanjun@huawei.com>]

From: Hanjun Guo <hanjun.guo@linaro.org>

Since we have a mapping index for SMMUv3 MSI, we can
directly use that index to get the map entry, then
retrieve dev ID and ITS parent to add SMMUv3 MSI
support.

Signed-off-by: Hanjun Guo <hanjun.guo@linaro.org>
---
 drivers/acpi/arm64/iort.c | 46 ++++++++++++++++++++++++++++++++++++----------
 1 file changed, 36 insertions(+), 10 deletions(-)

diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c
index 9439f02..ce03298 100644
--- a/drivers/acpi/arm64/iort.c
+++ b/drivers/acpi/arm64/iort.c
@@ -313,7 +313,8 @@ static int iort_id_map(struct acpi_iort_id_mapping *map, u8 type, u32 rid_in,
 	/* Single mapping does not care for input id */
 	if (map->flags & ACPI_IORT_ID_SINGLE_MAPPING) {
 		if (type == ACPI_IORT_NODE_NAMED_COMPONENT ||
-		    type == ACPI_IORT_NODE_PCI_ROOT_COMPLEX) {
+		    type == ACPI_IORT_NODE_PCI_ROOT_COMPLEX ||
+		    type == ACPI_IORT_NODE_SMMU_V3) {
 			*rid_out = map->output_base;
 			return 0;
 		}
@@ -357,7 +358,8 @@ struct acpi_iort_node *iort_node_get_id(struct acpi_iort_node *node,
 
 	if (map->flags & ACPI_IORT_ID_SINGLE_MAPPING) {
 		if (node->type == ACPI_IORT_NODE_NAMED_COMPONENT ||
-		    node->type == ACPI_IORT_NODE_PCI_ROOT_COMPLEX) {
+		    node->type == ACPI_IORT_NODE_PCI_ROOT_COMPLEX ||
+		    node->type == ACPI_IORT_NODE_SMMU_V3) {
 			*id_out = map->output_base;
 			return parent;
 		}
@@ -549,9 +551,21 @@ int iort_pmsi_get_dev_id(struct device *dev, u32 *dev_id)
 	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))
+	if (node->type == ACPI_IORT_NODE_SMMU_V3) {
+		u32 index;
+
+		if (iort_get_smmu_v3_id_mapping_index(node, &index))
+			return -ENODEV;
+
+		if (iort_node_map_platform_id(node, dev_id, IORT_MSI_TYPE,
+		    index))
 			return 0;
+	} else {
+		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;
@@ -626,20 +640,30 @@ static struct irq_domain *iort_get_platform_device_domain(struct device *dev)
 	struct acpi_iort_node *node, *msi_parent;
 	struct fwnode_handle *iort_fwnode;
 	struct acpi_iort_its_group *its;
-	int i;
 
 	/* find its associated iort node */
-	node = iort_scan_node(ACPI_IORT_NODE_NAMED_COMPONENT,
-			      iort_match_node_callback, dev);
+	node = iort_find_dev_node(dev);
 	if (!node)
 		return NULL;
 
 	/* then find its msi parent node */
-	for (i = 0; i < node->mapping_count; i++) {
+	if (node->type == ACPI_IORT_NODE_SMMU_V3) {
+		u32 index;
+
+		if (iort_get_smmu_v3_id_mapping_index(node, &index))
+			return NULL;
+
 		msi_parent = iort_node_map_platform_id(node, NULL,
+						       IORT_MSI_TYPE, index);
+	} else {
+		int i;
+
+		for (i = 0; i < node->mapping_count; i++) {
+			msi_parent = iort_node_map_platform_id(node, NULL,
 						       IORT_MSI_TYPE, i);
-		if (msi_parent)
-			break;
+			if (msi_parent)
+				break;
+		}
 	}
 
 	if (!msi_parent)
@@ -1233,6 +1257,8 @@ 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);
 
+	acpi_configure_pmsi_domain(&pdev->dev);
+
 	ret = platform_device_add(pdev);
 	if (ret)
 		goto dma_deconfigure;
-- 
1.7.12.4